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Liquid Crystal Display Having a Single Polarizer and No Retardation Film Compensation

Summary

A new type of liquid crystal display (LCD) is invented. Common LCDs are transmissive with a front and a back polarizer. For viewing in reflection, a diffuser and a mirror are added to the back of the LCD. The new LCD is a true reflective LCD where there is no rear polarizer. The LCD is simple in construction. It consists of only an input polarizer, the liquid crystal (LC) cell and a rear reflector which can be placed inside or outside of the LC cell. There is no rear polarizer and no retardation film compensation. It is capable of producing high contrast, low chromatic dispersion display. Depending on the twist angle chosen for the LC cell, the display can be used in direct view or in a projection type display. The display can also be driven in an active matrix mode or in a passive matrix multiplexed drive mode. A full numerical simulation which takes into account the liquid crystal director deformation under the application of an electric field was used to optimize such displays.

Technology Benefits

1. Improved light reflection efficiency and brightness
2. Wider viewing angles
3. Higher multiplexing capability
4. Low manufacturing cost
5. No retooling and change of procedure needed for existing LCD assembly lines

Technology Application

- Liquid crystal display (LCD) panels
- LCD projectors
- Twisted nematic (TN) and super twised nematic (STN) LCD

Supplementary Information

Patent Number: US5926245A
Application Number: US1997826800A
Inventor: Kwok, Hoi Sing | Yu, Fei Hong
Priority Date: 25 Mar 1997
Priority Number: US5926245A
Application Date: 25 Mar 1997
Publication Date: 20 Jul 1999
IPC Current: G02F0001139
US Class: 349180 | 349181
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Liquid crystal display having a single polarizer and no retardation film compensation
Usefulness: Liquid crystal display having a single polarizer and no retardation film compensation
Novelty: Reflective liquid crystal display without retardation compensation films

Industry

Electronics

Sub Group

Display

Application Date

25 Mar 1997

Application No.

US 08/826800

Patent Information

US 5926245

ID No.

TTC.PA.046

Country/Region

Hong Kong

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