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Technology for LCD TV -Current and Future

Explore current and future LCD TV technologies, comparing performance with CRT and plasma displays. Learn about key factors to boost LCD TV adoption and requirements for optimal viewing experience. Dive into high-performance LCD technologies, including IPS and MVA modes, and discover potential advancements and technologies shaping the next generation of LCD production.

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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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