Method of driving a color liquid crystal display and driver circuit for driving the display as well as portable electronic device with the driver circuit
AssigneeNEC Electronics Corporation
InventorYoshiharu Hashimoto
Life of this patent
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Abstract
The present invention provides a method and a circuit for driving a color liquid crystal display in a normal driving mode and a power saving mode, wherein in the normal driving mode, voltages corresponding to image display data are applied to data electrodes of the color liquid crystal display, and wherein in the power saving mode, voltages corresponding to highly significant bit signals of the image display data are applied as display data signals to the data electrodes.
Claims13
A drive circuit for a color liquid crystal display device comprising a gray scale voltage generating circuit including a plurality of resistors connected in series to generate gray scale voltage from each connection so that a current flowing through said gray scale voltage generating circuit becomes small when operating in 8-color mode as compared with a full color mode.
A method of controlling a driving circuit for color liquid display device comprising:
- a) connecting a plurality of resistors in series to a power source in full color mode;
- b) passing current to said plurality of resistors arranged in a gray scale voltage generating circuit for generating gray scale voltage in full color mode;
- and
- c) discontinuing the flow of current from said power source to each of said plurality of resistors in 8-color mode.
A mobile phone comprising a gray scale voltage generating circuit to which a liquid crystal panel and a plurality of resistors are connected in series to generate gray scale voltage from each connection so that current flowing through said gray scale voltage generating circuit becomes small when operating in 8-color mode as compared with a full color mode.
Dependencies are inferred from the claim text.