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Technology for LCD TV -Current and Future

Technology for LCD TV -Current and Future. 趙治宇 教授 台灣大學物理系. Contrast. Weight (kg). Living Room (200-300lx). 60. 1000. 40. 59. LCD. 500. CRT. 20. 32.7. 21.8. PDP. 10. 100. 1000. 0. CRT. LCD. PDP. 0. Brightness (cd/m2). Reflection Ratio (%). 600. 14. 12.

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Technology for LCD TV -Current and Future

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  1. Technology for LCD TV -Current and Future 趙治宇 教授 台灣大學物理系

  2. Contrast Weight (kg) Living Room (200-300lx) 60 1000 40 59 LCD 500 CRT 20 32.7 21.8 PDP 10 100 1000 0 CRT LCD PDP 0 Brightness (cd/m2) Reflection Ratio (%) 600 14 12 500 500 10 11.5 450 400 8 250 7.5 300 1.5 6 200 4 2 100 CRT LCD PDP CRT LCD PDP 0 0 LCD Performance vs. CRT and Plasma -Based on 32” CRT, 30” LCD and 32” PDP Courtesy by Sharp’s displaysearch 2003 conference talk

  3. Key factors to boost LCD TV • Green earth: • -60% of CRT TV power consumption • -EU will prohibit CRT TV import from the middle of 2006 • -Montreal • -California state government legislate restrict using CRT • DTV broadcasting • -DTV will be prevailing after 2006

  4. Requirements of LCD TV • Viewing angle • -176/176(170/170) • -no color shift with angle • -technology: IPS, MVA, OCB etc. • Response time • -12ms (GTG) • -technology:OSC, OCB, scanning B/L • Low cost • -large substrate • -market expansion • -technology: production, component

  5. Current High Performance LCD Technology -Wide viewing angle • In-Plane Switching mode: IPS A P LC molecules Rubbing direction Black White Off state On state

  6. Current High Performance LCD Technology -Wide viewing angle • Multi-domain Vertical Alignment Mode: MVA Black White/Gray Protrusion/bump Protrusions produce multi-domain

  7. Performance Comparsion • IPS has better performance in general viewing angle and faster • intergray response time • MVA has better peak (not average) contrast ratio GTG: gray to gray ☉: high ○: average △: low

  8. Characteristic of IPS mode • Inherent wide viewing angle • -small retardation change with viewing direction • -without compensation film • White color • -yellow shift from 45o diagonal • -blue shift from 135o diagonal • Black Luminance • -off angle need improvement

  9. Cont’d • Relatively low aperture ratio • -complex inter-digitized electrodes • -nonlinear behaviour with pixel pitch • Black level • -sensitive to rubbing condition • -Light leakage due to electrode edge taper angle • variation • Imaging sticking • -charge trapped in SiNx layer • -weak alignment anchoring energy

  10. Performance Improvement Technology -IPS mode • Dual Domain: white color at 45o and 135o diagonal angle • Novel Array structure for high transmittance • Rubbing-free alignment technology

  11. Characteristic of MVA mode • Inherent wide viewing angle • -small retardation change with viewing direction • (IPS has better performance on WVA) • White color • -shift from gray to gray • Black Luminance • -off angle need improvement • Rubbing-free • -less mura defects appear

  12. Other Performance Improvement Technologies • Rubbing free alignment technology • Color filter on Array(COA)/ Array on Color Filter • technology(AOC) • Photo spacer technology • Low resistance bus line technology

  13. Performance Improvement Technology -Super-MVA mode • Improvement aperture ratio by slit ITO • Optimal compensated film for off angle performance Slit ITO protrusion Multi-domain are formed by protrusions Multi-domain are formed by slit ITO

  14. Future Requirements Technologies • Innovation New Technology • High performance • Low cost • High yield • High throughput

  15. Potential Technologies for Next Gen. LCD Production • Softlithography • -Microcontacting Printing • -Microreplication • Nanolithography • -Dip-pen lithography • Size reduction • lithography • etc...

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