LCD Technology

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					Sharp vs. Samsung
LG Philips LCD vs. Chunghwa Picture Tubes

                 Esha Ranganath
           IEOR 190G: Patent Engineering
LCD: Liquid Crystal Display is a thin, flat display device
made up of any number of thin crystals
The crystals act like tiny shutters, opening or closing in
response to the stimulus, thereby allowing degrees of
light that have passed through specific colored pixels to
illuminate the screen, creating a picture.
These display screens are used in televisions, computer
monitors, and cell phones
LCD TV sales have increased in the last year to
approximately $17.5 billion in the third quarter.
However, steep price declines have made it difficult for
many LCD TV suppliers to generate profits.
Sharp portrays itself as the leader in LCD technologies
since the 1970s when it first used LCD displays in
Sharp Corporation filed a lawsuit in August 2007
against Samsung Electronics for five patent violations
centering around methods Sharp invented to improve
the quality of LCD displays
Sharp asked for compensation, a ban on infringing
products, and a court trial.
The two companies tried to negotiate a deal; however,
Sharp sued Samsung after the attempt for a licensing
agreement fell through.
1. U.S. Patent 4649383: A technology to drive LCDs to
realize image display with a high contrast ratio
2. U.S. Patent 5760855: Static induced damage to LCD is
prevented by guarding wiring
3. U.S. Patent 6052162: An LCD with an electrode
configuration that improves display quality by
improving the light use efficiency of picture elements.
4. U.S. Patent 7027024: A driving device of LCD that
improves display quality
5. U.S. Patent 7057689: An LCD with an optical film that
achieves a wide viewing angle by compensating phase
The court trial is still pending in the United States.
Meanwhile, Sharp has also filed a lawsuit against
Samsung in Korea asking for compensation for sale
damages and prohibition of future production.
Samsung has refused negotiations and seeks to fight it
out in court.
Meanwhile, Sharp is determined to win back the No.1
spot in LCD TV distribution by spending $3.20 billion to
build the world’s largest LCD panel plant.
Sharp has sued other companies for violations in the
past: i.e. Taiwan’s HannStar Display Corp.
Four year long patent dispute between LG Philips and
Taiwan based company Chunghwa Picture Tubes.
LG Philips LCD accused CGT on two fronts:
  1) The violation of thin film transistor LCD

  2) Side mounting technology: A method where the

   cover of the LCD module is attached using screws on
   the side rather than from the front. This allows for
   slimmer LCD modules. This particular case was filed
   in August 2002.
LG claims to have filed the lawsuit only after CPT
refused to cease its infringing activities or negotiate.
LG Philips LCD is fighting CPT infringements on six US
patents relating to thin-film transistor LCD technology:

U.S. Patent 4624737: Provide a simplified process for
producing a thin film transistor with an improved
contact process.

U.S. Patent 6373537: Increases the ratio of the viewing
area to the whole area of the computer display while
providing a thin, lightweight display unit
The case was finally settled in November 2007 after two
previous trials:
   July 2006: The court awarded $52.4 million to LG
   November 2006: The court awarded $53.5 million to LG
The current decision includes a cross-licensing
agreement to share past and future patents.
   Both companies believe this will strengthen their
    competitiveness in the industry.
Additionally, CPT will pay an undisclosed amount to LG
Philips LCD
LG Philips has filed two additional lawsuits against AU
Optronics and Chi Mei Optoelectronics

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