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Color Twisted Nematic Liquid Crystal Displays彩色扭曲液晶顯示器

Summary

Color liquid crystal displays (LCD) are usually made by putting color filters onto the individual pixels. These color filters are resins with color pigments. Full color displays can be made by a combination of the red, green and blue primary colors. This coloring scheme is the predominant technology for active matrix as well as passive matrix LCD currently in use. Many colors can be obtained.

While most of the attention of color filter-free LCDs are concentrated on the supertwisted nematic (STN) display with a twist angle of larger than 180˚, there is nevertheless a need for similar techniques for low twist angles LCDs.

By combining a proper set of values for the twist angle, the cell birefringence and the input/output polarizer angles, it is possible to obtain vivid colors in low twist LCDs as a function of the operating voltage without the use of color filters. Such displays have many applications in situations requiring only a few colors without gray scales.

Technology Benefits

1. Instead of focusing on the supertwisted nematic (STN) display with a twist angle of larger than 180˚, the invention displays novel techniques for low twist angles
2. Lower cost and no color filter is needed to generate color
3. Easier manufacturing process

Technology Application

- Low cost games
- Watches and clocks
- Toys
- Calculators

Supplementary Information

Patent Number: CN100451759C
Application Number: CN200410048725A
Inventor: Hoi-sing Kwok | Xing-jie Yu
Priority Date: 28 Nov 2003
Priority Number: CN100451759C
Application Date: 10 Jun 2004
Publication Date: 14 Jan 2009
IPC Current: G02F00011335 | G02B000530 | G02F0001139
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Color twisted nematic liquid crystal displays | Colour twisted nematic liquid crystal display
Usefulness: Color twisted nematic liquid crystal displays | Colour twisted nematic liquid crystal display
Novelty: Color twisted nematic LCD comprises front and rear polarizers with liquid crystal layer between them, such that front polarizer angle is between specific values relative to input director of liquid crystal layer

Industry

Electronics

Sub Group

Display

Application Date

10 Jun 2004

Application No.

Chinese 200410048725.4

Patent Information

Chinese ZL200410048725.4

ID No.

TTC.PA.216S

Country/Region

Hong Kong

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