Liquid crystal display device
AssigneeKabushiki Kaisha Toshiba
InventorsHoko Hirai, Susumu Kondo
Life of this patent
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Abstract
A wiring 19 of a device directly detects a voltage from a plurality of scanning electrodes 1, a voltage detecting electrode 701 detects a voltage from a plurality of the scanning electrodes 1. A voltage variation component such as voltage distortion of the detected voltage which adversely affects on an image display is taken out, inverted, and negative fed back to the scanning electrode 1. A negative feedback loop provides the negative feedback of the voltage detected from and fed back to the scanning electrode 1, this therefore suppresses the disadvantageous voltage variation such as a distortion voltage which tends to arise in the scanning electrode 1.
Claims8
In a liquid crystal display device comprising a scanning electrode substrate supporting a plurality of scanning electrodes, a data electrode substrate supporting a plurality of data electrodes and arranged in opposing relation to said scanning electrode substrate with said plurality of data electrodes intersecting with said plurality of scanning electrodes while maintaining gaps between said data electrodes and said scanning electrodes, a liquid crystal layer held between said scanning electrode substrate and said data electrode substrate, a driving voltage supply circuit outputting a plurality of voltage levels, a scanning driver circuit having switching circuits, each of which selects one voltage level from among said voltage levels and applies the selected voltage level to each of said plurality of scanning electrodes, and a data driver circuit for applying data signals to said plurality of data electrodes,
- a liquid crystal display device comprising:
- a plurality of electric capacitances or a plurality of electric resistances having first terminals connected to detect a voltage on each of said plurality of scanning electrodes and second terminals connected with a common wiring in which the detected voltages are averaged, and
- an operational amplifier having an input terminal connected with said common wiring to receive and amplify the averaged voltages and to synthesize said amplified voltages with at least one of said plurality of voltage levels selected by said switching circuits, whereby to provide at least one negative feedback loop for executing a negative feedback control of the voltage level applied to said plurality of scanning electrodes.
Dependencies are inferred from the claim text.