Data Supply Voltage Reduction Scheme for Low-Power AMOLED Displays
|
|
- Isaac Joseph
- 6 years ago
- Views:
Transcription
1 Data Supply Voltage Reduction Sche for Low-Power AMOLED Displays Hyoungsik Nam and Hoon Jeong This paper donstrates a new driving sche that allows reducing the supply voltage of data drivers for lowpower active matrix organic light-itting diode (AMOLED displays. The proposed technique drives down the data voltage range by %, which subsequently diminishes in the peak power consumption of data drivers at the full white pattern by 7%. ecause the gate voltage of a driving thin film transistor covers the same range as a conventional driving sche by means of a level-shifting sche, the low-data supply sche achieves the equivalent dynamic range of OLED currents. The average power consumption of data drivers is reduced by 6% over 4 test images, and power consumption is kept below %. Keywords: Data supply voltage reduction, low-power, level-shifting, AMOLED. I. Introduction Liquid crystal display (LCD has become the main display technology used in such consumer products as mobile phones, notebook PCs, monitors, and TVs. However, the market share of active matrix organic light-itting diodes (AMOLEDs has been significantly on the rise in the arena of small display applications, including mobile phones, and is expected to expand its domain into TV applications on the back of wide color gamut, slim and light design, high contrast ratio, fast response time, and the like []. As for AMOLED displays bodied in all consumer electronics, the industry may have to eventually apply lowpower technologies to abide with stricter legislation regarding the power consumption of electronic products [], [3]. So far, several power reduction techniques for AMOLED displays have been put forth, including OLED efficiency enhancent [4], through-current reduction in integrated panel circuitries [], and the RGW pixel format [6]. However, reducing the analog supply voltage of data drivers for low-power AMOLED displays has yet to be reported upon. ecause the power consumption of data drivers makes a big impact on the highresolution and high-frame-rate AMOLED displays for TV applications like LCDs [7], a low-power technique for data drivers is indispensable. II. Data Supply Voltage Reduction Sche Manuscript received Mar., ; revised June 8, ; accepted June,. This research was supported by National Research Foundation of Korea Grant funded by the Korean Government (KRF -39. Hyoungsik Nam (phone: , hyoungsiknam@khu.ac.kr and Hoon Jeong (hjeong@tftlcd.khu.ac.kr are with the Department of Information Display and Advanced Display Research Center, Kyung Hee University, Seoul, Rep. of Korea. The AMOLED pixel circuit that has been suffering from the nonuniformity probl should compensate the variation on the threshold voltage of a driving thin-film transistor (TFT. In past research, the nonuniformity compensation has been performed by voltage modulation, current programming, and digital ETRI Journal, Volume 34, Number, October Hyoungsik Nam and Hoon Jeong 77
2 is Data from to Data from to / Digital circuits Analog circuits P P Digital circuits Analog circuits A A C ST C TH P 3 C ST C TH P 3 VDD / I VDD P P 4 Data driver P P 4 EVSS Data driver D D Fig.. AMOLED pixel circuits and timing diagrams: (a conventional circuit with data voltage driven at and (b proposed circuit with data voltage driven at /. I CON (a / P P 6 init P 7 EVSS (b data smp init Sampling Compensation 3 Emission 3 V DATA Initialization Sampling 3 Compensation 4 Emission 3 4 RV V DATA DS data V DS = or / driving sches [8]-[]. One of the most widely used methods is the voltage modulation circuit depicted in Fig. (a []. Only p-channel poly-silicon TFTs have been ployed on account of cost and hot carrier issues. The operation is divided into three periods: sampling, compensation, and ission. Whereas P operates at the saturation region, the other TFTs (P, P 3, P 4 are in use at the triode region for switching. During the sampling period, P and P 3 are turned on and P 4 is turned off. ecause the current path to an OLED (D is cut off, there is no light output. Node A is charged through the data line at the supply voltage (, and node, which is the gate terminal of P, is settled at V TH, where V TH is the threshold voltage of P. As a result, the voltage across C TH (V A becomes V TH. In the compensation period, P 3 is turned off and the target data voltage (V DATA is applied via the data line to node A. Since node is floating, the gate voltage of P is set as V DATA V TH. In the ission period, P and P 3 are turned off and P 4 is turned on. The resulting current of D (I CON is described as (, which is independent of V TH : βp ICON = ( V VTH βp = ( V V V β ( V DATA TH TH P = DATA. ( Our proposed low-supply sche modifies the conventional AMOLED pixel circuit of Fig. (a into the circuit of Fig. (b with three additional switching TFTs (P, P 6, P 7, which might affect the pixel size and brightness, to reduce the power consumption of data drivers. The operation is divided into four periods: initialization, sampling, compensation, and ission. Particularly, the data signal is provided at the half range from to /, which leads to a % voltage reduction of data drivers analog supply. As the maximum possible swing magnitude decreases by % and the peak power consumption is proportional to its square, a substantial power consumption reduction of 7% can be achieved at the maximum. The operation is as follows. In the initialization period, node is connected to EVSS through P 7 to ensure that P is turned on at the diode connection at the following sampling period. During the sampling period, the source of P is connected to / through P 6 and the voltage of node (V reaches to / VTH. When V DS is defined as the data signal at the sampling period, the voltage across C TH (V A is expressed as VA = VDS + VTH. ( In a compensation period, the target data voltage (RV DATA of the reduced voltage range from to / is provided to node A, and V is modulated into RVDATA V A as (3. Consequently, V obtained by level-shifting RV DATA by / V TH when V DS is and by V TH when V DS is /: 78 Hyoungsik Nam and Hoon Jeong ETRI Journal, Volume 34, Number, October
3 / V DATA V DS = V V TH / V TH Source current (A 3 4 W/L=4 µm/ µm V DS = V V DS =. V V DS = / V TH Fig.. Level-shifting at V according to V DS. V = RV V = RV V + / V DATA A DATA DS TH RVDATA VTH + /, VDS =, = RV V, V = /. DATA TH DS (3 The ensuing V can cover the full range of from VTH to V TH by programming V DS with two levels of and / even at the half analog supply of /, as explained in Fig.. As a consequence, the uniform OLED current (I of the equivalent dynamic range is obtained as (4, which is independent of V TH : βp I = ( V VTH β,, ( P RVDATA VDS = = βp ( RVDATA, VDS =. (4 On the other hand, because the proposed sche covers two different voltage regions by level-shifting through C TH, any errors on the stored voltage across C TH can degrade the image quality. However, this issue can be resolved by ploying separate data mapping tables for two different regions. III. Simulation Results. Circuit Simulation The proposed low data voltage driving sche is verified by conducting Simulation Program with Integrated Circuit Emphasis (SPICE simulation with parameters extracted from fabricated p-channel poly-silicon TFTs. The simulated transfer characteristic of the p-channel TFT is plotted in Fig. 3. The mobility and threshold voltage are 8 cm /Vs and.6 V, respectively Gate-source voltage, V GS (V Fig. 3. Simulated transfer characteristic of p-channel TFT. For the proposed pixel circuit, the size of a driving TFT is μm/ μm, the size of all the other switching TFTs is 4 μm/ μm, is V, EVSS is V, C ST is. pf, and C TH is. pf. Figure 4(a shows the waveforms of control signals, and Figs. 4(b and 4(c present the voltage waveforms of nodes A and in the two cases of V DS = V and V DS =/= V. Figure 4(b shows that when V DS is equal to V, the voltage of node successfully reaches a higher level than / by level-shifting through C TH. Figure plots the gate voltage of a driving TFT (V regarding VDATA and V DS. Whereas the data voltage has the V range, the range of V is doubled to around V, resulting in the equivalent dynamic range of the OLED current. Finally, Fig. 6 presents the OLED current characteristics of a proposed pixel circuit at the threshold voltage variation of ±.3 V.. Power Evaluation ecause the data lines can be approximated as capacitive loads, the dynamic power consumption of data drivers is expressed by summing the square terms of the output voltage swings [7]. For the conventional sche of Fig. (a, each pixel has two transitions from to V DATA and from V DATA to. As a result, the dynamic power consumption of conventional data drivers (DP CON is described as DPCON = k ( VDATA ( i, j, ( i= j= where k is the coefficient, 3N is the total number of column lines, M is the total number of row lines, and V DATA (i, j is the target data voltage of an i-th column and j-th row subpixel. For the proposed sche, the power can be estimated from ETRI Journal, Volume 34, Number, October Hyoungsik Nam and Hoon Jeong 79
4 (V (V init (V (V Time (μs Node (V Node A (V RV DATA = 4 V 3 V DS = V Time (μs (b V DS = V 6 Node A (V RV DATA = 4 V 4 3 Node (V Time (μs (c Fig. 4. Waveforms (a for control signals, (b for nodes A and at V DS = V, and (c for nodes A and at V DS = V. the data voltage swings as well. However, because the data voltage level of the sampling period is different according to the required V, the power estimation is accomplished by the more complicated method. Since the output luminance is proportional to the current, the normalized luminance of an i-th column and j-th row subpixel (L NO (i, j can be given as (6, where g(i, j is the gray level of an i-th column and j-th row subpixel in an 8-bit depth, γ is the gamma value of a display, and V MIN is the minimum voltage (a V OLED current (µa V DS = V V DS = V RV DATA Fig.. Plot of V with respect to RV DATA and V DS V DS = V RV DATA (V V TH =.3 V V TH =.6 V V TH =.9 V V DS = V Fig. 6. Plot of OLED currents with respect to RV DATA and V DS at V TH variation of ±.3 V. level of V. Then, V (i, j and RV DATA (i, j are calculated with the gray level by (7 and (8: V L ( i j ( V (, i j gi (, j, = =, NO ( VMIN γ gi (, j = ( MIN V(, i j V, DATA γ (6 (7 V(, i j, V(, i j <, (, i j = V(, i j, V(, i j. The resultant squares of the voltage swing (DV (i, j at a (8 73 Hyoungsik Nam and Hoon Jeong ETRI Journal, Volume 34, Number, October
5 (a (b (c (d Fig. 7. Test patterns used to measure dynamic powers of data drivers: (a white (b black, (c H-line, and (d V-line. Normalized power (% Patterns. DP NC DP NP White lock H-line V-line Fig. 8. Simulated power consumptions DP NC and DP NP depending on images displayed on conventional and proposed sches. given subpixel are estimated by considering the four cases as (9 to ( and the dynamic power consumption of the proposed sche (DP is achieved as their sum, shown in (3: When V ( i, j < & V ( i, j + <, DV (, i j = VDATA (, i j ; When V (, i j < & V (, i j+, ( DV (, i j = VDATA (, i j + ( VDATA (, i j ; When V (, i j & V (, i j + <, ( DV (, i j = ( VDATA (, i j + VDATA (, i j ; When V(, i j & V(, i j +, ( DV (, i j = V (, i j ; ( DATA (9 Fig test images in use for evaluation. DP = k DV (, i j. (3 i= j= At the condition of V MIN = V, the normalized dynamic power consumption of conventional and proposed sches (DP NC, DP NP is defined as ( and (6 by means of the maximum dynamic power (DP MAX of (4: MAX (, DP = k = 6 knm ( DP DP i= j= ( VDATA ( i, j CON i= j= NC = = DPMAX 3 NM ( DP DV ( i, j DP i= j= NP = = DPMAX 6 NM (., (4 ( (6 First, we measure DP NC and DP NP according to the four test images shown in Fig. 7. In the conventional sche, the voltage swings become the maximum and minimum values at the white and black patterns, respectively. Thus, we can expect the white and black patterns to show the largest and smallest amount of dynamic power consumption of DP MAX and. Since the H-line and V-line patterns contain the same number of white and black pixels, the H-line and V-line patterns lead the medium power consumption of DP MAX /. However, in the proposed syst, the white and black patterns show the lower maximum power of DP MAX /4, and the H-line and V-line patterns consume DP MAX /8 and DP MAX /4, respectively. The simulation results of the four test patterns are presented in Fig. 8. When the displayed images include more low gray pixels, DP NC can be smaller than DP NP. However, the proposed method guarantees that any image consumes less than DP MAX /4. ETRI Journal, Volume 34, Number, October Hyoungsik Nam and Hoon Jeong 73
6 Table. Measured power consumption. Power reduction Test image APL DP NC (% DP NP (% (DP NC DP NP/DP NC Average We evaluate the power consumption of the 4 real picture images, as shown in Fig. 9. Table shows the average pixel levels (APLs, the normalized power consumption, and the power reduction ratios for test images. Particularly, in image 8, DP NP is larger than DP NC because most of its pixels are located in the low gray region. The proposed sche establishes a substantial average power reduction of 6% for the 4 images. IV. Conclusion Our low data supply sche was established by reducing the data voltage range by half. Even at the reduced data voltage range, the full dynamic range of an OLED current was achieved using level-shifting through a sampling capacitor according to the level of a data voltage in the sampling period. The feasibility of the proposed sche was verified by SPICE. In addition, we showed that the power consumption is smaller than one-fourth of the maximum power in the conventional method over any displayed images. References [] S.S. Kim, The Next ig Thing in Displays, keynote presentation, SID,. [] J. Souk and S. Whangbo, Green Technology in LCDs, Information Display, vol. 6, no. &, Nov./Dec., pp [3] K. Teunissen and L.J. de OLDE, EcoDesign for TV Displays Information Display, Inf. Display, vol. 6, no. &, Nov./Dec., pp. -4. [4] J.Y. Lee, J.H. Kwon, and H.K. Chung, High Efficiency and Low Power Consumption in Active Matrix Organic Light Emitting Diodes, Organic Electron., vol. 4, no. -3, Sept. 3, pp [] S.H. Jung et al., A New Low-Power pmos Poly-Si Inverter for AMDs, IEEE Electron Device Lett., vol. 6, no., Jan., pp. 3-. [6] H. Kanno et al., Reduction in Power Consumption for Full-Color Active Matrix Organic Light-Emitting Devices, Jpn. J. Appl. Phys., vol. 4, no. 3, Sept. 6, pp. L947-L9. [7] H. Nam and S.-W. Lee, Low-Power Liquid Crystal Display Television Panel with Reduced Motion lur, IEEE Trans. Consum. Electron., vol. 6, no., May, pp [8] N. Komiya et al., Comparison of Vth Compensation Ability among Voltage Programming Circuits for AMOLED Panels, Proc. th Int. Display Workshops, 3, pp [9] T. Sasaoka et al., A 3.-inch AM-OLED Display with Top Emitting Structure and Adaptive Current Mode Programmed Pixel Circuit (TAC, Soc. Inf. Display (SID Symp. Digest,, pp [] T. Inukai et al., 4.-in. TFT-OLED Displays and a Novel Digital Driving Method, Soc. Inf. Display (SID Symp. Digest,, pp [] R.M.A. Dawson et al., Design of an Improved Pixel for a Polysilicon Active-Matrix Organic LED Display, Soc. Inf. Display (SID Symp. Digest, 998, pp. -4. Hyoungsik Nam received his S, MS, and PhD in EECS from the Korea Advance Institute of Science and Technology (KAIST, Daejeon Rep. of Korea, in 996, 998, and 4. He was involved in several projects of the VDSL transceiver, PLL/DLL, and LDIs for portable devices. He joined Samsung Electronics as a senior engineer in, where he worked on Active-Matrix Liquid- Crystal Displays in the area of motion picture quality improvent, new image signal interfaces, the compression algorithm, low-power 73 Hyoungsik Nam and Hoon Jeong ETRI Journal, Volume 34, Number, October
7 technology, and low-cost display solutions for LCDs. He was in charge of the development of the world s first clock bedded intra panel interface, AiPi TM. He is currently an assistant professor in the Department of Information Display at Kyung Hee University, Seoul, Rep. of Korea. His current research interests are low-power technologies, integrated circuits, and signal/user interfaces for flat panel displays. He has been active with SID and IMID as a mber of the Program Committee. Hoon Jeong received his MS in electronic engineering from Kyungpook National University, Daegu, Rep. of Korea, in 999. etween 999 and, at LG Displays Co. Ltd, he was in charge of developing highresolution mobile applications for low tperature polycrystalline silicon TFTs. Since, he has been pursuing his PhD at Kyung Hee University, Seoul, Rep. of Korea. His current research is focused on oxide TFTs, LTPS, and AMOLED display. ETRI Journal, Volume 34, Number, October Hyoungsik Nam and Hoon Jeong 733
Overview of All Pixel Circuits for Active Matrix Organic Light Emitting Diode (AMOLED)
Chapter 2 Overview of All Pixel Circuits for Active Matrix Organic Light Emitting Diode (AMOLED) ---------------------------------------------------------------------------------------------------------------
More informationChapter 3 Evaluated Results of Conventional Pixel Circuit, Other Compensation Circuits and Proposed Pixel Circuits for Active Matrix Organic Light Emitting Diodes (AMOLEDs) -------------------------------------------------------------------------------------------------------
More informationA Luminance Adjusting Algorithm for High Resolution and High Image Quality AMOLED Displays of Mobile Phone Applications
H.-J. In et al.: A uminance Adjusting Algorithm for High Resolution and High Image Quality AMOED Displays of Mobile Phone Applications A uminance Adjusting Algorithm for High Resolution and High Image
More informationNew Pixel Circuit Compensating Poly-si TFT Threshold-voltage Shift for a Driving AMOLED
Journal of the Korean Physical Society, Vol. 56, No. 4, April 2010, pp. 1185 1189 New Pixel Circuit Compensating Poly-si TFT Threshold-voltage Shift for a Driving AMOLED C. L. Fan, Y. Y. Lin, B. S. Lin
More informationP_02_1011:A Novel Pixel Circuit to Compensate for the Degradation of OLED Luminance in High-Resolution AMOLED Displays
P_0_1011:A Novel Pixel Circuit to Compensate for the Degradation of OLED Luminance in High-Resolution AMOLED Displays National Cheng Kung University Department of Electrical Engineering IDBA Lab. Advisor..
More information3012 IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 57, NO. 11, NOVEMBER 2010
3012 IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 57, NO. 11, NOVEMBER 2010 An Advanced External Compensation System for Active Matrix Organic Light-Emitting Diode Displays With Poly-Si Thin-Film Transistor
More informationDesign of Organic TFT Pixel Electrode Circuit for Active-Matrix OLED Displays
JOURNAL OF COMPUTERS, VOL. 3, NO. 3, MARCH 2008 1 Design of Organic TFT Pixel Electrode Circuit for Active-Matrix Displays Aram Shin, Sang Jun Hwang, Seung Woo Yu, and Man Young Sung 1) Semiconductor and
More informationORGANIC light-emitting diode (OLED) displays are
100 IEEE/OSA JOURNAL OF DISPLAY TECHNOLOGY, VOL. 1, NO. 1, SEPTEMBER 2005 A New Pixel Circuit for Driving Organic Light-Emitting Diode With Low Temperature Polycrystalline Silicon Thin-Film Transistors
More informationReducing image sticking in AMOLED displays with time-ratio gray scale by analog calibration
Reducing image sticking in AMOLED displays with time-ratio gray scale by analog calibration Dong-Yong Shin (SID Student Member) Jong-Kwan Woo Yongtaek Hong (SID Member) Keum-Nam Kim Do-Ik Kim Myoung-Hwan
More informationA New Overlap-Scan Circuit for High Speed and Low Data Voltage in Plasma-TV
1218 A New Overlap-Scan Circuit for High Speed and Low Data Voltage in Plasma-TV Byung-Gwon Cho, Heung-Sik Tae, Senior Member, IEEE, Dong Ho Lee, and Sung-IL Chien, Member, IEEE Abstract A new overlap-scan
More informationfile://\\fileserver\ 함께갖다 \[[XI 논문 ]]\IDMC\2009\proceedings.htm
DMC009 file://\\fileserver\ 함께갖다 \[[X 논문 ]]\DMC\009\proceedings.htm 페이지 1 / 7 010-01- Welcome Acknowledgement Committees Chairperson Proceedings Author ndex Search Home PROCEEDNGS Keynote Speeches Wed-KN-01
More informationComparative Analysis of Organic Thin Film Transistor Structures for Flexible E-Paper and AMOLED Displays
Comparative Analysis of Organic Thin Film Transistor Structures for Flexible E-Paper and AMOLED Displays Linrun Feng, Xiaoli Xu and Xiaojun Guo ECS Trans. 2011, Volume 37, Issue 1, Pages 105-112. doi:
More informationCOMPENSATION FOR THRESHOLD INSTABILITY OF THIN-FILM TRANSISTORS
COMPENSATION FOR THRESHOLD INSTABILITY OF THIN-FILM TRANSISTORS by Roberto W. Flores A Thesis Submitted to the Graduate Faculty of George Mason University in Partial Fulfillment of The Requirements for
More informationAM-OLED pixel circuits suitable for TFT array testing. Research Division Almaden - Austin - Beijing - Haifa - India - T. J. Watson - Tokyo - Zurich
RT0565 Engineering Technology 4 pages Research Report February 3, 2004 AM-OLED pixel circuits suitable for TFT array testing Y. Sakaguchi, D. Nakano IBM Research, Tokyo Research Laboratory IBM Japan, Ltd.
More informationAn a-ingazno TFT Pixel Circuit Compensating Threshold Voltage and Mobility Variations in AMOLEDs
402 JOURNAL OF DISPLAY TECHNOLOGY, VOL. 10, NO. 5, MAY 2014 An a-ingazno TFT Pixel Circuit Compensating Threshold Voltage and Mobility Variations in AMOLEDs Yongchan Kim, Jerzy Kanicki, and Hojin Lee,
More informationTHE CAPABILITY to display a large number of gray
292 JOURNAL OF DISPLAY TECHNOLOGY, VOL. 2, NO. 3, SEPTEMBER 2006 Integer Wavelets for Displaying Gray Shades in RMS Responding Displays T. N. Ruckmongathan, U. Manasa, R. Nethravathi, and A. R. Shashidhara
More informationA novel TFT-OLED integration for OLED-independent pixel programming in amorphous-si AMOLED pixels
A novel TFT-OLED integration for OLED-independent pixel programming in amorphous-si AMOLED pixels Bahman Hekmatshoar Alex Z. Kattamis Kunigunde Cherenack Sigurd Wagner James C. Sturm Abstract The direct
More informationSINCE more than two decades, Organic Light Emitting
1672 JOURNAL OF DISPLAY TECHNOLOGY, VOL. 12, NO. 12, DECEMBER 2016 Impact of Long-Term Stress on the Light Output of a WRGB AMOLED Display Frédérique Chesterman, Bastian Piepers, Tom Kimpe, Patrick De
More informationMonolithic CMOS Power Supply for OLED Display Driver / Controller IC
Monolithic CMOS Power Supply for OLED Display Driver / Controller IC Cheung Fai Lee SOLOMON Systech Limited Abstract This paper presents design considerations of a power supply IC to meet requirements
More informationPLEASE SCROLL DOWN FOR ARTICLE
This article was downloaded by: [2007-2008-2009 Yonsei University Central Library] On: 25 September 2009 Access details: Access Details: [subscription number 907680128] Publisher Taylor & Francis Informa
More informationAMOLED compensation circuit patent analysis
IHS Electronics & Media Key Patent Report AMOLED compensation circuit patent analysis AMOLED pixel driving circuit with threshold voltage and IR-drop compensation July 2013 ihs.com Ian Lim, Senior Analyst,
More informationLow-Power and Area-Efficient Shift Register Using Pulsed Latches
Low-Power and Area-Efficient Shift Register Using Pulsed Latches G.Sunitha M.Tech, TKR CET. P.Venkatlavanya, M.Tech Associate Professor, TKR CET. Abstract: This paper proposes a low-power and area-efficient
More information(12) Patent Application Publication (10) Pub. No.: US 2005/ A1
(19) United States US 2005O285825A1 (12) Patent Application Publication (10) Pub. No.: US 2005/0285825A1 E0m et al. (43) Pub. Date: Dec. 29, 2005 (54) LIGHT EMITTING DISPLAY AND DRIVING (52) U.S. Cl....
More informationDIFFERENTIAL CONDITIONAL CAPTURING FLIP-FLOP TECHNIQUE USED FOR LOW POWER CONSUMPTION IN CLOCKING SCHEME
DIFFERENTIAL CONDITIONAL CAPTURING FLIP-FLOP TECHNIQUE USED FOR LOW POWER CONSUMPTION IN CLOCKING SCHEME Mr.N.Vetriselvan, Assistant Professor, Dhirajlal Gandhi College of Technology Mr.P.N.Palanisamy,
More informationAn FPGA Implementation of Shift Register Using Pulsed Latches
An FPGA Implementation of Shift Register Using Pulsed Latches Shiny Panimalar.S, T.Nisha Priscilla, Associate Professor, Department of ECE, MAMCET, Tiruchirappalli, India PG Scholar, Department of ECE,
More informationDigital time-modulation pixel memory circuit in LTPS technology
Digital time-modulation pixel memory circuit in LTPS technology Szu-Han Chen Ming-Dou Ker Tzu-Ming Wang Abstract A digital time-modulation pixel memory circuit on glass substrate has been designed and
More information(12) Patent Application Publication (10) Pub. No.: US 2010/ A1
(19) United States (12) Patent Application Publication (10) Pub. No.: US 2010/001381.6 A1 KWak US 20100013816A1 (43) Pub. Date: (54) PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME (76)
More informationHEBS: Histogram Equalization for Backlight Scaling
HEBS: Histogram Equalization for Backlight Scaling Ali Iranli, Hanif Fatemi, Massoud Pedram University of Southern California Los Angeles CA March 2005 Motivation 10% 1% 11% 12% 12% 12% 6% 35% 1% 3% 16%
More informationID C10C: Flat Panel Display Basics
ID C10C: Flat Panel Display Basics Renesas Electronics America Inc. Robert Dunhouse, Display BU Engineering Manager 12 October 2010 Revision 1.1 Robert F. Dunhouse, Jr. Displays Applications Engineering
More informationNext Generation of Poly-Si TFT Technology: Material Improvements and Novel Device Architectures for System-On-Panel (SOP)
Next Generation of Poly-Si TFT Technology: Material Improvements and Novel Device Architectures for System-On-Panel (SOP) Tolis Voutsas* Paul Schuele* Bert Crowder* Pooran Joshi* Robert Sposili* Hidayat
More informationChapter 2 Circuits and Drives for Liquid Crystal Devices
Chapter 2 Circuits and Drives for Liquid Crystal Devices Hideaki Kawakami 2.1 Circuits and Drive Methods: Multiplexing and Matrix Addressing Technologies Hideaki Kawakami 2.1.1 Introduction The liquid
More informationThe preferred display color temperature (Non-transparent vs. Transparent Display)
The preferred display color temperature (Non-transparent vs. Transparent Display) Hyeyoung Ha a, Sooyeon Lee a, Youngshin Kwak* a, Hyosun Kim b, Young-jun Seo b, Byungchoon Yang b a Department of Human
More informationDesign Low-Power and Area-Efficient Shift Register using SSASPL Pulsed Latch
Design Low-Power and Area-Efficient Shift Register using SSASPL Pulsed Latch 1 D. Sandhya Rani, 2 Maddana, 1 PG Scholar, Dept of VLSI System Design, Geetanjali college of engineering & technology, 2 Hod
More informationA Modified Static Contention Free Single Phase Clocked Flip-flop Design for Low Power Applications
JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, VOL.8, NO.5, OCTOBER, 08 ISSN(Print) 598-657 https://doi.org/57/jsts.08.8.5.640 ISSN(Online) -4866 A Modified Static Contention Free Single Phase Clocked
More information(12) United States Patent
(12) United States Patent Sung USOO668058OB1 (10) Patent No.: US 6,680,580 B1 (45) Date of Patent: Jan. 20, 2004 (54) DRIVING CIRCUIT AND METHOD FOR LIGHT EMITTING DEVICE (75) Inventor: Chih-Feng Sung,
More informationA 5-Gb/s Half-rate Clock Recovery Circuit in 0.25-μm CMOS Technology
A 5-Gb/s Half-rate Clock Recovery Circuit in 0.25-μm CMOS Technology Pyung-Su Han Dept. of Electrical and Electronic Engineering Yonsei University Seoul, Korea ps@tera.yonsei.ac.kr Woo-Young Choi Dept.
More informationWhite Paper. Uniform Luminance Technology. What s inside? What is non-uniformity and noise in LCDs? Why is it a problem? How is it solved?
White Paper Uniform Luminance Technology What s inside? What is non-uniformity and noise in LCDs? Why is it a problem? How is it solved? Tom Kimpe Manager Technology & Innovation Group Barco Medical Imaging
More informationLow Power High Speed Voltage Level Shifter for Sub- Threshold Operations
International Journal of Innovative Research in Electronics and Communications (IJIREC) Volume 1, Issue 5, August 2014, PP 34-41 ISSN 2349-4042 (Print) & ISSN 2349-4050 (Online) www.arcjournals.org Low
More informationALIQUID CRYSTAL display (LCD) has been gradually
178 JOURNAL OF DISPLAY TECHNOLOGY, VOL. 6, NO. 5, MAY 2010 Local Blinking HDR LCD Systems for Fast MPRT With High Brightness LCDs Lin-Yao Liao, Chih-Wei Chen, and Yi-Pai Huang Abstract A new impulse-type
More informationA Local Dimming Algorithm for Low Power LCD TVs Using Edge-type LED Backlight
054 IEEE Transactions on Consumer Electronics, Vol. 56, o. 4, ovember 0 A Local Dimming Algorithm for Low Power LCD TVs Using Edge-tpe LED Backlight Hunsuk Cho, Student ember, IEEE and Oh-Kong Kwon, ember,
More informationPERFORMANCE ANALYSIS OF AN EFFICIENT PULSE-TRIGGERED FLIP FLOPS FOR ULTRA LOW POWER APPLICATIONS
Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320 088X IMPACT FACTOR: 5.258 IJCSMC,
More informationMASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Electrical Engineering and Computer Science
MASSACHUSETTS INSTITUTE OF TECHNOLOGY epartment of Electrical Engineering and Computer Science 6.374: Analysis and esign of igital Integrated Circuits Problem Set # 5 Fall 2003 Issued: 10/28/03 ue: 11/12/03
More informationDesign and Simulation of a Digital CMOS Synchronous 4-bit Up-Counter with Set and Reset
Design and Simulation of a Digital CMOS Synchronous 4-bit Up-Counter with Set and Reset Course Number: ECE 533 Spring 2013 University of Tennessee Knoxville Instructor: Dr. Syed Kamrul Islam Prepared by
More informationModifying the Scan Chains in Sequential Circuit to Reduce Leakage Current
IOSR Journal of VLSI and Signal Processing (IOSR-JVSP) Volume 3, Issue 1 (Sep. Oct. 2013), PP 01-09 e-issn: 2319 4200, p-issn No. : 2319 4197 Modifying the Scan Chains in Sequential Circuit to Reduce Leakage
More informationInterframe Bus Encoding Technique for Low Power Video Compression
Interframe Bus Encoding Technique for Low Power Video Compression Asral Bahari, Tughrul Arslan and Ahmet T. Erdogan School of Engineering and Electronics, University of Edinburgh United Kingdom Email:
More informationOperating Bio-Implantable Devices in Ultra-Low Power Error Correction Circuits: using optimized ACS Viterbi decoder
Operating Bio-Implantable Devices in Ultra-Low Power Error Correction Circuits: using optimized ACS Viterbi decoder Roshini R, Udhaya Kumar C, Muthumani D Abstract Although many different low-power Error
More informationHigh Performance TFT LCD Driver ICs for Large-Size Displays
Name: Eugenie Ip Title: Technical Marketing Engineer Company: Solomon Systech Limited www.solomon-systech.com The TFT LCD market has rapidly evolved in the last decade, enabling the occurrence of large
More informationEfficient Architecture for Flexible Prescaler Using Multimodulo Prescaler
Efficient Architecture for Flexible Using Multimodulo G SWETHA, S YUVARAJ Abstract This paper, An Efficient Architecture for Flexible Using Multimodulo is an architecture which is designed from the proposed
More informationDm 200. (12) Patent Application Publication (10) Pub. No.: US 2007/ A1. (19) United States. User. (43) Pub. Date: Oct. 18, 2007.
(19) United States (12) Patent Application Publication (10) Pub. No.: US 2007/0242068 A1 Han et al. US 20070242068A1 (43) Pub. Date: (54) 2D/3D IMAGE DISPLAY DEVICE, ELECTRONIC IMAGING DISPLAY DEVICE,
More informationV6118 EM MICROELECTRONIC - MARIN SA. 2, 4 and 8 Mutiplex LCD Driver
EM MICROELECTRONIC - MARIN SA 2, 4 and 8 Mutiplex LCD Driver Description The is a universal low multiplex LCD driver. The version 2 drives two ways multiplex (two blackplanes) LCD, the version 4, four
More information(12) United States Patent
USOO7023408B2 (12) United States Patent Chen et al. (10) Patent No.: (45) Date of Patent: US 7,023.408 B2 Apr. 4, 2006 (54) (75) (73) (*) (21) (22) (65) (30) Foreign Application Priority Data Mar. 21,
More informationREDUCING DYNAMIC POWER BY PULSED LATCH AND MULTIPLE PULSE GENERATOR IN CLOCKTREE
Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology IJCSMC, Vol. 3, Issue. 5, May 2014, pg.210
More informationACTIVE matrix organic light-emitting diode (AMOLED)
IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 59, NO. 4, APRIL 2012 1123 A New AMOLED Pixel Circuit With Pulsed Drive and Reverse Bias to Alleviate OLED Degradation Kuei-Yu Lee and Paul C.-P. Chao, Member,
More informationLiquid Crystal Display (LCD)
Liquid Crystal Display (LCD) When coming into contact with grooved surface in a fixed direction, liquid crystal molecules line up parallelly along the grooves. When coming into contact with grooved surface
More informationDisplays. AND-TFT-7PA-WV 1440 x 234 Pixels LCD Color Monitor. Features
1440 x 234 Pixels LCD Color Monitor The is a compact full color TFT LCD module, whose driving board is capable of converting composite video signals to the proper interface of LCD panel and is suitable
More informationIEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I: REGULAR PAPERS 1
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I: REGULAR PAPERS 1 Area-Efficient Time-Shared Digital-to-Analog Converter With Dual Sampling for AMOLED Column Driver IC s Tai-Ji An, Moon-Sang Hwang, Won-Jun
More informationIII... III: III. III.
(19) United States US 2015 0084.912A1 (12) Patent Application Publication (10) Pub. No.: US 2015/0084912 A1 SEO et al. (43) Pub. Date: Mar. 26, 2015 9 (54) DISPLAY DEVICE WITH INTEGRATED (52) U.S. Cl.
More informationEL302 DIGITAL INTEGRATED CIRCUITS LAB #3 CMOS EDGE TRIGGERED D FLIP-FLOP. Due İLKER KALYONCU, 10043
EL302 DIGITAL INTEGRATED CIRCUITS LAB #3 CMOS EDGE TRIGGERED D FLIP-FLOP Due 16.05. İLKER KALYONCU, 10043 1. INTRODUCTION: In this project we are going to design a CMOS positive edge triggered master-slave
More informationVARIOUS DISPLAY TECHNOLOGIESS
VARIOUS DISPLAY TECHNOLOGIESS Mr. Virat C. Gandhi 1 1 Computer Department, C. U. Shah Technical Institute of Diploma Studies Abstract A lot has been invented from the past till now in regards with the
More informationFlat Panel Displays: LCD Technologies and Trends
Flat Panel Displays: LCD Technologies and Trends Robert Dunhouse, Sr. Engineering Manager, Display BU Class ID: 4C01B Renesas Electronics America Inc. Robert F. Dunhouse, Jr. Sr. Engineering Manager, Display
More informationChapter 1 Introduction --------------------------------------------------------------------------------------------------------------- 1.1 Overview of the Organic Light Emitting Diode (OLED) Displays Flat
More informationFully Static and Compressed Topology Using Power Saving in Digital circuits for Reduced Transistor Flip flop
Fully Static and Compressed Topology Using Power Saving in Digital circuits for Reduced Transistor Flip flop 1 S.Mounika & 2 P.Dhaneef Kumar 1 M.Tech, VLSIES, GVIC college, Madanapalli, mounikarani3333@gmail.com
More informationIn-Cell Projected Capacitive Touch Panel Technology
1384 INVITED PAPER Special Section on Electronic Displays In-Cell Projected Capacitive Touch Panel Technology Yasuhiro SUGITA a), Member, Kazutoshi KIDA, and Shinji YAMAGISHI, Nonmembers SUMMARY We describe
More information(12) Patent Application Publication (10) Pub. No.: US 2011/ A1
(19) United States (12) Patent Application Publication (10) Pub. No.: US 2011/0084992 A1 Ishizuka US 20110084992A1 (43) Pub. Date: Apr. 14, 2011 (54) (75) (73) (21) (22) (86) ACTIVE MATRIX DISPLAY APPARATUS
More informationProduct G e n e r a l S p e c i f i c a t i o n
. General Description The LCD is a Color Active Matrix Liquid Crystal Display with an integral Cold Cathode Fluorescent Tube(CCFT) back light system. The matrix employs asi Thin Film Transistor as the
More informationIEEE. Proof I. INTRODUCTION
368 JOURNAL OF DISPLAY TECHNOLOGY, VOL. 5, NO. 9, SEPTEMBER 2009 Design of Analog Output Buffer With Level Shifting Function on Glass Substrate for Panel Application Tzu-Ming Wang, Student Member,, Ming-Dou
More informationINTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATION ENGINEERING & TECHNOLOGY (IJECET)
INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATION ENGINEERING & TECHNOLOGY (IJECET) Proceedings of the 2 nd International Conference on Current Trends in Engineering and Management ICCTEM -2014 ISSN
More informationTemporal Error Concealment Algorithm Using Adaptive Multi- Side Boundary Matching Principle
184 IJCSNS International Journal of Computer Science and Network Security, VOL.8 No.12, December 2008 Temporal Error Concealment Algorithm Using Adaptive Multi- Side Boundary Matching Principle Seung-Soo
More information(12) United States Patent
(12) United States Patent Sanford et al. USOO6734636B2 (10) Patent No.: (45) Date of Patent: May 11, 2004 (54) OLED CURRENT DRIVE PIXEL CIRCUIT (75) Inventors: James Lawrence Sanford, Hopewell Junction,
More informationLeakage Current Reduction in Sequential Circuits by Modifying the Scan Chains
eakage Current Reduction in Sequential s by Modifying the Scan Chains Afshin Abdollahi University of Southern California (3) 592-3886 afshin@usc.edu Farzan Fallah Fujitsu aboratories of America (48) 53-4544
More informationActive-Matrix Liquid Crystal Displays - Operation, Electronics and Analog Circuits Design
Active-Matrix Liquid Crystal Displays - Operation, Electronics and Analog Circuits Design Ilias Pappas, Stylianos Siskos and Charalambos A. Dimitriadis Physics Department Aristotle University of Thessaloniki
More informationDisplays AND-TFT-5PA PRELIMINARY. 320 x 234 Pixels LCD Color Monitor. Features
PRELIMINARY 320 x 234 Pixels LCD Color Monitor The is a compact full color TFT LCD module, whose driving board is capable of converting composite video signals to the proper interface of LCD panel and
More informationLiquid Crystal Displays with High Image Quality and Fast Response Time
Journal of the Korean Physical Society, Vol. 39, December 2001, pp. S42 S48 Liquid Crystal Displays with High Image Quality and Fast Response Time S. H. Lee and M-H. Lee Department of Polymer Science and
More informationThis talk covers currently available display technology.
Introduction to Current Display Technologies for Medical Image Viewing Perspectives for the TG270 Update on Display Quality Control Alisa Walz-Flannigan, PhD (DABR) Mayo Clinic, Rochester, Minnesota AAPM
More information8.1: Advancements and Outlook of High Performance Active-Matrix OLED Displays
8.1: Advancements and Outlook of High Performance Active-Matrix OLED Displays Takatoshi Tsujimura *, Wei Zhu, Seiichi Mizukoshi, Nobuyuki Mori, Koichi Miwa, Shinya Ono, Yuichi Maekawa, Kazuyoshi Kawabe,
More informationHIGH PERFORMANCE AND LOW POWER ASYNCHRONOUS DATA SAMPLING WITH POWER GATED DOUBLE EDGE TRIGGERED FLIP-FLOP
HIGH PERFORMANCE AND LOW POWER ASYNCHRONOUS DATA SAMPLING WITH POWER GATED DOUBLE EDGE TRIGGERED FLIP-FLOP 1 R.Ramya, 2 C.Hamsaveni 1,2 PG Scholar, Department of ECE, Hindusthan Institute Of Technology,
More informationDesign of a High Frequency Dual Modulus Prescaler using Efficient TSPC Flip Flop using 180nm Technology
Design of a High Frequency Dual Modulus Prescaler using Efficient TSPC Flip Flop using 180nm Technology Divya shree.m 1, H. Venkatesh kumar 2 PG Student, Dept. of ECE, Nagarjuna College of Engineering
More informationSI-Studio environment for SI circuits design automation
BULLETIN OF THE POLISH ACADEMY OF SCIENCES TECHNICAL SCIENCES, Vol. 60, No. 4, 2012 DOI: 10.2478/v10175-012-0087-5 ELECTRONICS SI-Studio environment for SI circuits design automation S. SZCZĘSNY, M. NAUMOWICZ,
More informationSpectroscopy on Thick HgI 2 Detectors: A Comparison Between Planar and Pixelated Electrodes
1220 IEEE TRANSACTIONS ON NUCLEAR SCIENCE, OL. 50, NO. 4, AUGUST 2003 Spectroscopy on Thick HgI 2 Detectors: A Comparison Between Planar and Pixelated Electrodes James E. Baciak, Student Member, IEEE,
More informationFinFETs & SRAM Design
FinFETs & SRAM Design Raymond Leung VP Engineering, Embedded Memories April 19, 2013 Synopsys 2013 1 Agenda FinFET the Device SRAM Design with FinFETs Reliability in FinFETs Summary Synopsys 2013 2 How
More informationAsynchronous Model of Flip-Flop s and Latches for Low Power Clocking
Asynchronous Model of Flip-Flop s and Latches for Low Power Clocking G.Abhinaya Raja & P.Srinivas Department Of Electronics & Comm. Engineering, Nimra College of Engineering & Technology, Ibrahimpatnam,
More informationEFFICIENT POWER REDUCTION OF TOPOLOGICALLY COMPRESSED FLIP-FLOP AND GDI BASED FLIP FLOP
EFFICIENT POWER REDUCTION OF TOPOLOGICALLY COMPRESSED FLIP-FLOP AND GDI BASED FLIP FLOP S.BANUPRIYA 1, R.GOWSALYA 2, M.KALEESWARI 3, B.DHANAM 4 1, 2, 3 UG Scholar, 4 Asst.Professor/ECE 1, 2, 3, 4 P.S.R.RENGASAMY
More informationThe Technological Trends of Future AMOLED
Invited Paper The Technological Trends of Future AMOLED Jong hyuk Lee*, Hye Dong Kim, Chang Ho Lee, Hyun-Joong Chung, Sung Chul Kim, and Sang Soo Kim Technology Center, Samsung Mobile Display Co., LTD
More informationA Power Efficient Flip Flop by using 90nm Technology
A Power Efficient Flip Flop by using 90nm Technology Mrs. Y. Lavanya Associate Professor, ECE Department, Ramachandra College of Engineering, Eluru, W.G (Dt.), A.P, India. Email: lavanya.rcee@gmail.com
More informationInternational Journal of Emerging Technologies in Computational and Applied Sciences (IJETCAS)
International Association of Scientific Innovation and Research (IASIR) (An Association Unifying the Sciences, Engineering, and Applied Research) International Journal of Emerging Technologies in Computational
More informationAND-TFT-64PA-DHB 960 x 234 Pixels LCD Color Monitor
960 x 234 Pixels LCD Color Monitor The AND-TFT-64PA-DHB is a compact full color TFT LCD module, that is suitable for applications such as a car TV, portable DCD, GPS, multimedia applications and other
More informationV DD V DD V CC V GH- V EE
N/A 480 x 468 Pixels LCD Color Monitor The is a compact full color TFT LCD module, whose driving board is capable of converting composite video signals to the proper interface of LCD panel and is suitable
More informationDesign of New Dual Edge Triggered Sense Amplifier Flip-Flop with Low Area and Power Efficient
Design of New Dual Edge Triggered Sense Amplifier Flip-Flop with Low Area and Power Efficient Ms. Sheik Shabeena 1, R.Jyothirmai 2, P.Divya 3, P.Kusuma 4, Ch.chiranjeevi 5 1 Assistant Professor, 2,3,4,5
More information(12) United States Patent (10) Patent No.: US 8,803,770 B2. Jeong et al. (45) Date of Patent: Aug. 12, 2014
US00880377OB2 (12) United States Patent () Patent No.: Jeong et al. (45) Date of Patent: Aug. 12, 2014 (54) PIXEL AND AN ORGANIC LIGHT EMITTING 20, 001381.6 A1 1/20 Kwak... 345,211 DISPLAY DEVICE USING
More informationthe Most Popular Display Technology?
Why is LCD the Most Popular Display Technology? History of Liquid Crystal Display (LCD) As early as 1889, scientists discovered that chemicals such as cholesteryl benzoate, when melted into liquid form,
More informationDesign of Active Matrix Micro-LED Display with CCCS Pixel Circuits
Design of Active Matrix Micro-LED Display with CCCS Pixel Circuits Ke ZHANG 1, 2, Zhaojun LIU* 1, 2 and Hoi-Sing KWOK* 1 1 State Key Laboratory on Advanced Displays and Optoelectronics Technologies, The
More informationDESIGN OF DOUBLE PULSE TRIGGERED FLIP-FLOP BASED ON SIGNAL FEED THROUGH SCHEME
Scientific Journal Impact Factor (SJIF): 1.711 e-issn: 2349-9745 p-issn: 2393-8161 International Journal of Modern Trends in Engineering and Research www.ijmter.com DESIGN OF DOUBLE PULSE TRIGGERED FLIP-FLOP
More informationAn Introduction to OLED/TFT Device Model and FPD Design Flow
An Introduction to OLED/TFT Device Model and FPD Design Flow Lifeng Wu, Huada Empyrean Software MOS-AK Beijing Compact Modeling Workshop,June 15-16, 2018 1 Outline LCD and OLED Flat Panel Display (FPD)
More informationChapter 9 MSI Logic Circuits
Chapter 9 MSI Logic Circuits Chapter 9 Objectives Selected areas covered in this chapter: Analyzing/using decoders & encoders in circuits. Advantages and disadvantages of LEDs and LCDs. Observation/analysis
More informationSINCE the first observations of the light emission in small
IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 52, NO. 6, JUNE 2005 1123 A Novel Current-Scaling a-si:h TFTs Pixel Electrode Circuit for AM-OLEDs Yen-Chung Lin, Member, IEEE, Han-Ping D. Shieh, Senior Member,
More informationProduct General Specification
. General Description The is a Color Active Matrix with an integral Cold Cathode Fluorescent Tube(CCFT) back light system. The matrix employs asi Thin Film Transistor as the active element. It is a transmissive
More information12.1-in. WXGA AMOLED display driven by InGaZnO thin-film transistors
12.1-in. WXGA AMOLED display driven by InGaZnO thin-film transistors Jae Kyeong Jeong (SID Member) Jong Han Jeong Hui Won Yang Tae Kyung Ahn Minkyu Kim Kwang Suk Kim Bon Seog Gu Hyun-Joong Chung Jin Seong
More informationPerformance Comparison of Bilayer and Multilayer OLED
Performance Comparison of Bilayer and Multilayer OLED Akanksha Uniyal, Poornima Mittal * Department of Electronics and Communication School of Engineering and Technology Graphic Era University, Dehradun-248002,
More informationDevelopment of Simple-Matrix LCD Module for Motion Picture
Development of Simple-Matrix LCD Module for Motion Picture Kunihiko Yamamoto* Shinya Takahashi* Kouki Taniguchi* * A1203 Project Team Abstract A simple-matrix LCD module (12.1-in. SVGA) has been developed
More informationReduction of Area and Power of Shift Register Using Pulsed Latches
I J C T A, 9(13) 2016, pp. 6229-6238 International Science Press Reduction of Area and Power of Shift Register Using Pulsed Latches Md Asad Eqbal * & S. Yuvaraj ** ABSTRACT The timing element and clock
More information