Liquid crystal display device
AssigneeToshiba Matsushita Display Technology Co., Ltd.
InventorsMasahiro Tada, Yoshiaki Nakazaki, Akihiko Saitoh, Hiroyuki Kimura, Shinichi Hirota
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Abstract
In order to prevent a gradation shift due to variations in the thickness of a film used to form an auxiliary capacitor, a detection capacitor having a layer structure similar to that of the auxiliary capacitor placed for each pixel is provided on an array substrate. Furthermore, the capacitor value of the detection capacitor as a representative of the plurality of auxiliary capacitors is detected, and the potential amplitude ΔVcs of a power supply line connected to the auxiliary capacitor is adjusted based on this detected value.
Claims5
A display device comprising:
- a display section comprising a switch element, an auxiliary capacitor, and a pixel electrode for each of segments bordered by a plurality of scan lines and a plurality of signal lines;
- a first oscillator comprising a detection capacitor having a layer structure similar to that of the auxiliary capacitor;
- a first frequency counter configured to count an output frequency of the first oscillator;
- a first register configured to store the counted frequency;
- a converter configured to convert the stored frequency into an adjustment value on the basis of a predetermined relationship between the output frequency of the first oscillator and an adjustment value for a potential amplitude of the auxiliary capacitor;
- and
- an adjuster configured to adjust a potential amplitude of a power supply line connected to the auxiliary capacitor based on the resultant adjustment value.
Dependencies are inferred from the claim text.