wk 12 - Digital Display & Packaging D.T.Shaw EE...

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Digital Display & Packaging D. T. Shaw EE 11/17/09
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CRT Display
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ATTRIBUTES HIGH RESOLUTION HIGH BRIGHTNESS LARGE VIEWING ANGLE HIGH WRITING SPEEDS LARGE COLOUR GAMUT HIGH CONTRAST LESS WEIGHT AND SIZE LOW POWER CONSUMPTION LOW COST
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TECHNOLOGIES CATHODE RAY TUBE (CRT) FIELD EMISSION DISPLAY (FED) LIQUID CRYSTAL DISPLAY (LCD) PLASMA DISPLAY PANEL (PDP) ORGANIC LIGHT EMITTING DIODE (OLED) DMD GLV
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CRT 100 YEAR OLD WORKHORSE CATHODOLUMINISCENT BEAM SCAN DEVICE LARGE VIEWING ANGLE HIGH BRIGHTNESS HIGH RESOLUTION GOOD COLOUR GAMUT BEST PERFORMANCE TO COST BULKY HEAVY UNIMPLEMENTABLE IN LARGE SIZES OBSOLESCENCE STILL ENJOYS 70% MARKET
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Field emission displays, electrons coming from millions of tiny microtips pass through gates and light up pixels on a screen. This principle is similar to that of cathode-ray tubes in television sets. The difference: Instead of just one "gun" spraying electrons against the inside of the screens face, there are as many as 500 million of them (microtips). FED Principles FED Principles
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Cathode Cathode The cathode/backplate is a matrix of row and column traces. Each crossover lays the foundation for an addressable cathode emitters. Each crossover has up to 4,500 emitters, 150 nm in diameter. This emitter density assures a high quality image through manufacturing redundancy, and long-life through low operational stress.
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Emission Emitters generate electrons when a small voltage is applied to both row (base layer) and column (top layer).
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Pixels Faceplate picture elements (pixels) are formed by depositing and patterning a black matrix, standard red, green, and blue TV phosphors and a thin aluminum layer to reflect colored light forward to the viewer .
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Metal Tips
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I-V of Metal Tip Typical field emission characteristics of the FEA pixel with an area of 240 mm x 240 mm containing 1.4x10 6 tips:
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Characterised by Superior mechanical strength (bending modulus 1 TPa) Low weight Good heat conductance Ability to emit a cold electron at relatively low voltages due to high aspect ratios (10 2 –10 4) and nanometer size tips (1 – 50 nm). Carbon Nanotube
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FED advantages Inherently high luminous efficiency No Response Time issues CRT-like Colour Gamut Lower Power Consumption Cold Cathode Emission Distance between cathode and screen ~0.2–5mm Flat Panel Technology Matrix Addressed – No DY Capital investment for manufacturing VLS TV with printable CNT FEDs - 1/10 th of LCD Cost advantage over LCD could be 40% Te c hno lo g y Lum ino us   Effic ie nc y  (Lm /W) C RT (a t 30KV) 3 PDP 0.8 LC D 3 O LED / PLED 5 FED a t 8 KV 7
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FED LARGE VIEWING ANGLE HIGH BRIGHTNESS,HIGH RESOLUTION TECHNOLOGY NOT MATURE
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LCD Most mature flat panel technology Major share of FPD market Poor intrinsic viewing angle Requires backlight Inefficient Slow Effected by Temperature and sunlight 
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LCD There are many modes operation
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This note was uploaded on 02/19/2011 for the course EE 515 taught by Professor Dr.shaw during the Fall '10 term at SUNY Buffalo.

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wk 12 - Digital Display & Packaging D.T.Shaw EE...

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