Technology for LCD TV

1
Technology for LCD TV -Current and Future
??? ?? ???????
2
LCD Performance vs. CRT and Plasma -Based on 32
CRT, 30 LCD and 32 PDP
Courtesy by Sharps 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)
• -technologyOSC, 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
Contd

• 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...