| 摘要 |
A liquid crystal device has a video interface having a reference value shifter and a level converter, which work as a gamma controller, and has a counter electrode signal generating circuit having a feedback amplifying circuit for adjusting peak-to-peak amplitude of a counter electrode signal on the basis of a control signal sent from a brightness adjuster. The reference value shifter shifts a reference value of polygonal-line approximation characteristics as much as a variation of the counter electrode signal amplitude on the basis of the control signal sent from the brightness adjuster. The level converter converts a level of an image signal in accordance with the polygonal-line approximation characteristics determined on the basis of the varying reference value, and thus compensates non-linearity of light transmittance index characteristics of liquid crystal to an applied voltage. Consequently, it is possible to provide the small, thin and cheap liquid crystal display device having a display brightness adjusting function capable of producing correct gradation.
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