Liquid crystal display and signal correcting circuit therefor
AssigneeNEC Corporation
InventorsToshiyuki Morita, Shinichi Nishida
Life of this patent
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Abstract
A signal correcting circuit, which adds a correction value generated based on a signal stored in a frame memory to an input signal and outputs a resultant signal, is used to correct image data which is an input signal to a liquid crystal display to thereby completely compensate for the influence of the asymmetry of the input signal on the liquid crystal display. This prevents generation of residual images and flickering of the screen.
Claims6
A signal correcting circuit for a liquid crystal display, comprising:
- a polarity determining section for determining from an input signal whether a voltage applied to a liquid crystal has a positive polarity or a negative polarity;
- a sign appending section for appending a positive or negative signal to said input signal in accordance with a decision made by said polarity determining section;
- a frame memory;
- a first multiplier for multiplying data stored in said frame memory by a first constant;
- a first adder for adding a signal to which said positive or negative sign is appended by said sign appending section to an output signal from said first multiplier and outputting a resultant signal to said frame memory;
- a second multiplier for multiplying data stored in said frame memory by a second constant;
- a second adder for adding an output signal from said sign appending section to an output signal from said second multiplier;
- and
- an absolute value acquiring section for removing a positive or negative sign from an output signal from said second adder and outputting a resultant signal as an absolute value.
A liquid crystal display that uses an output signal from an absolute value acquiring section of a signal correcting circuit as input signal to a liquid crystal display section having display pixels laid out in a matrix form, said signal correcting circuit comprising:
- a polarity determining section for determining from an input signal whether a voltage applied to a liquid crystal has a positive polarity or a negative polarity;
- a sign appending section for appending a positive or negative signal to said input signal in accordance with a decision made by said polarity determining section;
- a frame memory;
- a first multiplier for multiplying data stored in said frame memory by a first constant;
- a first adder for adding a signal to which said positive or negative sign is appended by said sign appending section to an output signal from said first multiplier and outputting a resultant signal to said frame memory;
- a second multiplier for multiplying data stored in said frame memory by a second constant;
- a second adder for adding an output signal from said sign appending section to an output signal from said second multiplier;
- and
- said absolute value acquiring section for removing a positive or negative sign from an output signal from said second adder and outputting a resultant signal as an absolute value.
Dependencies are inferred from the claim text.