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US 8,013,964 B2Granted
Liquid crystal display device
AssigneeAu Optronics Corporation
InventorsCheng Lo, Yung-Lun Lin, Ching-Sheng Cheng, Chih-Jen Hu
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Abstract
A liquid crystal display device uses a first quarter-wave retardation film and a hybrid aligned nematic film to reduce light leakage in dark state for reaching high contrast ratio, and uses multiple-gamma IC to provide different gamma-curve signals for pixels of different colors to solve color shift problem. In addition, the liquid crystal display device may use a second quarter-wave retardation film to reduce light leakage when viewed in a wide angle so as to further provide higher contrast ratio.
Claims13
A liquid crystal display (LCD) device, comprising:
- an LCD panel having a light incident surface, a light emitting surface, and a slow axis;
- a first polarizer, disposed adjacent to the light incident surface of the LCD panel, having a first transmissive axis;
- a first quarter-wave retardation film, disposed between the LCD panel and the first polarizer, having a slow axis;
- a hybrid aligned nematic film, disposed between the LCD panel and the first quarter-wave retardation film, having a slow axis;
- a second polarizer, disposed on the light emitting surface of the LCD panel, having a second transmissive axis;
- and
- a multiple-gamma IC adapted to provide different gamma-curve signals to different color pixels of the LCD panel, respectively;
- wherein the first transmissive axis of the first polarizer is substantially perpendicular to the second transmissive axis of the second polarizer, the slow axis of the first quarter-wave retardation film is substantially perpendicular to the slow axis of the hybrid aligned nematic film, the slow axis of the hybrid aligned nematic film is substantially parallel to the slow axis of the LCD panel, and an included angle between the slow axis of the first quarter-wave retardation film and the first transmissive axis of the first polarizer is greater than 0° and smaller than 90°.
5 more elements
Dependencies are inferred from the claim text.