PROJECTORS BRADLEY BRANAM
TYPES OF PROJECTORS LCD DLP 1- CHIP DLP 3- CHIP LCoS
LCD PROJECTORS LIQUID CRYSTAL DISPLAY Light passes through LCD to block or let light through at pixel level Light then passes through a color filter RGB Light combines in prism then out through lens
DLP 1- CHIP DIGITAL LIGHT PROCESSING Light bounces off a DMD (Digital Micromirror Device) DMD deflects or reflects light into lens at pixel level Light passes through color wheel before mirror to achieve colors
DLP 3- CHIP Similar to 1- Chip Light is split into RGB then sent to 3 separate DMD chips Light is then recombined and sent through lens
LCoS LIQUID CRYSTAL on SILICON A mix of LCD and DLP Light passes through an LCD panel then bounces off a DMD Creates higher pixel density
PROJECTOR LENSES Some projectors allow for changeable lenses Lenses have different focal lengths to give flexibility in projector placement
LENS RATIO RaWo of throw distance and screen size Lower rawo=projector closer to screen
THROW DISTANCE The distance from the projector to the screen or surface O[en dictated by performance space constraints
SCREEN SIZE How large of a projecwon screen or surface is needed? Knowing the size of the screen and the available projector posiwons usually dictates throw distance
ONLINE CALCULATOR h_p://www.projectorcentral.com/ projecwon- calculator- pro.cfm
LENS SHIFT Projector controls can shi[ the lens horizontally and verwcally to help fine tune projector focus Helpful when stacking or matching projectors
PIXEL DENSITY THE NUMBER OF PIXELS THAT MAKE UP IMAGE
ASPECT RATIO RATIO OF THE WIDTH RELATIVE TO THE HEIGHT OF AN IMAGE
PROJECTOR LAMPS Bright, metal halide lamps Require warm up and cool down Wme Very sensiwve to vibrawon while on and cooling down
BRIGHTNESS- LUMENS Projector brightness is rated in Lumens Rule of Thumb Expect to spend around $1 per lumen on a new projector
LAMP HANDLING Handle lamps carefully Never touch glass with fingers Let lamps cool completely before handling Change lamps before they burn out if possible
CONTRAST RATIO THE DIFFERENCE BETWEEN LIGHT AND DARK IN PROJECTED IMAGE LARGER RATIO = BETTER REPRESENTATION OF BLACK IN IMAGE
VIDEO BLACK Projectors project light even when they are not projecwng content The light output can be seen during blackouts on stage Light can be blocked or masked to solve the problem
INPUT/OUTPUT Projectors have several opwons for input VGA DVI HDMI Component Video Composite Video S- Video
VGA Video Graphics Array Analog video signal
DVI Digital Visual Interface Analog or Digital Six Types:
HDMI High DefiniWon Media Interface Digital Audio and Video Signals on the same cable
COMPONENT VIDEO Analog Signal Signal is split into 2 or more separate signals
COMPOSITE VIDEO Analog All Video Signals are combined into one cable
S- VIDEO Type of Composite video where four signals are carried on one cord Popular consumer electronics format prior to HDMI
PROJECTOR SETUP TURN ON PROJECTOR ADJUST PROJECTOR POSITION ROUGH FOCUS LENS SET BACKGROUND SET INPUT SET VIDEO MODE
CALIBRATION BRIGHTNESS CONTRAST SHARPNESS COLOR SATURATION COLOR TINT GAMMA
BRIGHTNESS SET TO FULL/100% LOWER UNTIL BLACK LEVELS ARE BLACK AND ALL GRAY LEVELS ARE STILL VISIBLE
CONTRAST SET CONTRAST TO MIDDLE/50% INCREASE UNTIL THE WHITE SQUARE IS WHITE BUT STILL SEPARATE FROM THE LIGHTEST GREY
SHARPNESS LOAD FOCUS GRID WITH FINE LINES ADJUST PROJECTOR LENS FOCUS ADJUST SHARPNESS SETTING TO FINE TUNE FOCUS
COLOR LOAD COLOR IMAGE OR TEST PATTERN SATURATION TINT GAMMA
COLOR SATURATION AMOUNT OF COLOR OR COLOR BRIGHTNESS INCREASE TO FULL 100% LOWER LEVELS UNTIL COLORS LOOK CORRECT AND BLACKS ARE STILL BLACK
COLOR TINT COLOR CONTRAST SET TO MIDDLE OR 50% INCREASE UNTIL COLORS ARE CRISP AND WHITE IS TRUE WHITE
GAMMA CORRECTION SETTING OF THE RELASHONSHIP OF SIGNAL INPUT TO SIGNAL OUTPUT GAMMA CAN EFFECT SHADOW DETAIL AND PERCEIVED DEPTH
GAMMA CORRECTION ADJUST UP OR DOWN UNTIL THE IMAGE APPEARS CLEAR LOWER GAMMA IF IMAGE APPEARS TOO DARK INCREASE GAMMA IF IMAGE APPEARS WASHED OUT