Liquid crystal display system and pixel-charge delay circuit thereof
AssigneeChunghwa Picture Tubes, Ltd.
InventorsChao-Min Lee, Chia-Yi Lu
Life of this patent
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Abstract
A liquid crystal display system for improving display color mismatch utilizes a pixel-charge delay circuit to generate a new latch-data signal for a source driver of the liquid crystal display system according to an output-enable signal and a latch-data signal generated by a timing control circuit of the liquid crystal display system. Therefore, when the source driver charges a pixel on an mth gate line, a switch corresponding to a pixel on an (m−1)th gate line is already completely turned off.
Claims8
A liquid crystal display system, comprising:
- a liquid crystal display panel having a plurality of pixels;
- a gate driving circuit for controlling output signals of a plurality of scan lines, wherein an output signal of each scan line is used for controlling turning-on and turning-off of a switch coupled to a pixel;
- a source driving circuit for converting display data into a data voltage, then charging/discharging a corresponding pixel to a voltage corresponding to a gray level according to the data voltage;
- a timing control circuit coupled to the gate driving circuit for generating and sending an output enable signal to the gate driving circuit, and a latch data signal;
- and
- a pixel-charge delay circuit coupled to the timing control circuit and the source driving circuit for generating and sending a new latch data signal to the source driving circuit according to the output enable signal and the latch data signal, the pixel-charge delay circuit comprising:
- a first flip-flop for generating a first latch data signal according to a positive edge of the latch data signal;
- a second flip-flop for generating a first output enable signal according to a negative edge of the output enable signal;
- and
- an exclusive-OR gate coupled to the first flip-flop and the second flip-flop for generating the new latch data signal according to the first latch data signal and the first output enable signal.
A pixel-charge delay circuit applied to a liquid crystal display system, the pixel-charge delay circuit comprising:
- a first flip-flop for generating a first latch data signal according to a positive edge of the latch data signal from a timing control circuit of the liquid crystal display system;
- a second flip-flop for generating a first output enable signal according to a negative edge of an output enable signal of the timing control circuit;
- and
- an exclusive-OR gate coupled to the first flip-flop and the second flip-flop for generating and sending the new latch data signal to a source driving circuit of the liquid crystal display system according to the first latch data signal and the first output enable signal.
Dependencies are inferred from the claim text.