Liquid crystal display panel improving flicker problem due to difference of grey voltages and refreshing frequency
AssigneeTcl China Star Optoelectronics Technology Co., Ltd.
InventorXiang Gao
Life of this patent
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Abstract
A timing controller includes a detecting circuit, a control circuit, and a compensation circuit. The timing controller reads the compensation values according to the variance between refreshing frequencies and compensate the second basic value in the white balance data driving table based on the first basic value accordingly. This could efficiently improve the grey voltage difference between after and before switching the refreshing frequency. This could efficiently improve the flicker issue.
Claims18
A timing controller, having a white balance data driving table, the timing controller comprising:
- a detecting circuit, configured to detect and obtain a refreshing frequency according to a frame starting signal of the timing controller;
- a control circuit, connected to an output end of the detecting circuit, configured to receive the refreshing frequency, buffer a first refreshing frequency corresponding to a previous frame, and output a control command corresponding to a variance between the first refreshing frequency and a second refreshing frequency corresponding to a current frame;
- and
- a compensation circuit comprising a register that stores a compensation data table, connected to an output end of the control circuit, configured to read a compensation value corresponding to the variance stored in the compensation data table and a first basic value corresponding to the first refreshing frequency stored in the white balance data driving table to compensate a second basic value corresponding to the second refreshing frequency stored in the white balance data driving table according to the control command;
- wherein when the variance is zero, the control circuit stop outputting the control command;
- and when the variance is not zero, the second basic value is a sum of the first basic value and the compensation value.
A method for adjusting a grey voltage of a liquid crystal display (LCD) panel, comprising:
- obtaining refreshing frequencies of frames of the LCD panel;
- calculating a variance between a second refreshing frequency corresponding to a current frame and a first refreshing frequency corresponding to a previous frame;
- and
- reading a compensation value corresponding to the variance stored in a compensation data table and a first basic value corresponding to the first refreshing frequency stored in a white balance data driving table to compensate a second basic value corresponding to the second refreshing frequency stored in the white balance data driving table according to the variance;
- wherein when the variance is not zero, the second basic value is a sum of the first basic value and the compensation value;
- and the first basic value and the second basic value are both configured to adjust a corresponding grey voltage.
A liquid crystal display (LCD) panel, comprising a timing controller, the timing controller having a white balance data driving table, the timing controller comprising:
- a detecting circuit, configured to detect and obtain a refreshing frequency according to a frame starting signal of the timing controller;
- a control circuit, connected to an output end of the detecting circuit, configured to receive the refreshing frequency, buffer a first refreshing frequency corresponding to a previous frame, and output a control command corresponding to a variance between the first refreshing frequency and a second refreshing frequency corresponding to a current frame;
- and
- a compensation circuit comprising a register that stores a compensation data table, connected to an output end of the control circuit, configured to read a compensation value corresponding to the variance stored in the compensation data table and a first basic value corresponding to the first refreshing frequency stored in the white balance data driving table to compensate a second basic value corresponding to the second refreshing frequency stored in the white balance data driving table according to the control command;
- wherein when the variance is zero, the control circuit stop outputting the control command;
- and when the variance is not zero, the second basic value is a sum of the first basic value and the compensation value.
Dependencies are inferred from the claim text.