Gray level correction device for LCD
OwnerHong-Da Liuinventor
Life of this patent
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Abstract
A gray level correction device for a liquid crystal display is disclosed for applications in transflective liquid crystal displays. When the display image is switched between a transitive type and a reflective type, or the conditions of the external light source changes, the γ curve of the display is switched by a γ-curve correction device. Multi-mode γ curves are designed according to the variation of the source light. By comparing with a built-in database, the γ curve is switched to adjust the gray level to an optimized value, thereby obtaining the best display image in the transitive type and reflective type or the contrast in different environments.
Claims20
A gray level correction device for tuning a γ-curve signal of a liquid crystal display (LCD), the gray level correction device comprising:
- a first sensor, which detects an external light source projecting to the LCD, including intensities of light at a plurality of angles, and converts the intensities into a first light source signal;
- a second sensor, which detects the light intensity of a back light source of the LCD and converts the light intensity into a second light source signal;
- a database, which receives the first and second light source signals, is built with the γ curves of the external light source and the back light source, and outputs a correction signal according to the first and second light source signals;
- a γ-curve correction device, which receives the correction signal and outputs a γ-curve signal according to the correction signal;
- and
- a liquid crystal display (LCD) panel, which receives the γ-curve signal and displays an image accordingly.
A gray level correction device for tuning a γ-curve signal of a liquid crystal display (LCD), the gray level correction device comprising:
- a first sensor, which detects an external light source projecting to the LCD, including intensities of light at a plurality of angles, and converts the intensities into a first light source signal;
- a second sensor, which detects the light intensity of a back light source of the LCD and converts the light intensity into a second light source signal;
- a database, which receives the first and second light source signals, is built with the γ curves of the external light source and the back light source, and outputs a correction signal according to the first and second light source signals;
- and
- a γ-curve correction device, which receives the correction signal and outputs a γ-curve signal according to the correction signal.
Dependencies are inferred from the claim text.