Gamma voltage generator and control method thereof and liquid crystal display device utilizing the same
AssigneeAu Optronics Corporation
InventorsHung-Min Shih, Chung-Kuang Tsai
Life of this patent
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Abstract
A gamma voltage generator can control brightness of a first color pixel unit and a second color pixel unit. A first potential divider is coupled between a first node and a second node for generating a first main gamma voltage. At least one second potential divider is coupled between the second node and a third node for generating a first sub-gamma voltage and a second sub-gamma voltage. The brightness of the first color pixel unit is controlled by the first main gamma voltage and the first sub-gamma voltage. The brightness of the second color pixel unit is controlled by the first main gamma voltage and the second sub-gamma voltage.
Claims13
A gamma voltage generator controlling brightness of a first color pixel unit and a second color pixel unit, comprising:
- a first potential divider coupled between a first node and a second node for generating a first main gamma voltage;
- and
- at least one second potential divider coupled between the second node and a third node for generating a first sub-gamma voltage and a second sub-gamma voltage;
- wherein the brightness of the first color pixel unit is controlled by the first main gamma voltage and the first sub-gamma voltage, and the brightness of the second color pixel unit is controlled by the first main gamma voltage and the second sub-gamma voltage.
A liquid crystal display device comprising:
- a display panel comprising a first and a second color pixel unit coupled to a data electrode and different gate electrodes;
- a gate driver outputting a plurality of scan signals to the corresponding gate electrodes;
- and
- a data driver outputting a video signal to the data electrode for controlling brightness of the first color pixel unit and the second color pixel unit and comprising:
- a first potential divider coupled between a first node and a second node for generating a first main gamma voltage;
- and
- at least one second potential divider coupled between the second node and a third node for generating a first sub-gamma voltage and a second sub-gamma voltage;
- wherein the brightness of the first color pixel unit is controlled by the first main gamma voltage and the first sub-gamma voltage, and the brightness of the second color pixel unit is controlled by the first main gamma voltage and the second sub-gamma voltage.
A control method controlling a liquid crystal display device comprising a display panel comprising a first color pixel unit couple to a first data electrode and a first gate electrode, a second color pixel unit coupled to the first data electrode and a second gate electrode, and a gamma voltage generator comprising a first potential divider coupled between a first node and a second node for generating a first main gamma voltage and at least one second potential divider coupled between the second node and a third node for generating a first sub-gamma voltage and a second sub-gamma voltage, the control method comprising:
- selecting a pixel unit;
- outputting the first main gamma voltage or the first sub-gamma voltage for controlling brightness of the selected pixel unit when the selected pixel unit is the first color pixel unit;
- and
- outputting the first main gamma voltage or the second sub-gamma voltage for controlling brightness of the selected pixel unit when the selected pixel unit is the second color pixel unit.
Dependencies are inferred from the claim text.