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US 8,299,999 B2Granted
Liquid crystal display with periodical changed voltage difference between data voltage and common voltage
AssigneesInnocom Technology (Shenzhen) Co., Ltd., Chimei Innolux Corporation
InventorsChien-Fan Tung, Shun-Ming Huang
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Abstract
An exemplary liquid crystal display includes a plurality of pixel units each including a pixel electrode for receiving data voltages and a common electrode for receiving a common voltage having a constant value. The data voltages applied to each pixel electrodes are equal to a sum of a main data voltage having a square waveform and an auxiliary voltage that is periodically changed at intervals each formed by four continuous frames. An absolute value of the auxiliary voltage is less than a voltage difference between the main data voltage and the common voltage, a sum of the auxiliary voltage is zero in a minimum period.
Claims13
A liquid crystal display, comprising:
- a plurality of pixel units arranged in a matrix, each pixel unit comprising a pixel electrode and a common electrode;
- a data driving circuit configured for providing a plurality of data voltages to each pixel electrode, the data voltages applied to each pixel electrodes being a sum of a main data voltage and an auxiliary voltage, the main data voltage having a square waveform, and the auxiliary voltage being periodically changed at intervals each formed by four continuous frames;
- a common voltage generating circuit configured for providing a common voltage having a constant value to each common electrode;
- and
- a gamma voltage generating circuit configured for providing gamma voltages to the data driving circuit;
- wherein the auxiliary voltage is less than a voltage difference between the main data voltage and the common voltage, in two frames of the four continuous frames, the voltage differences between the data voltages and the common voltage are substantially equal to an absolute value of Vdata−Vcom, and in remaining two frames of the two continuous frames, the voltage difference between the data voltages and common voltage in one of the remaining two frames is substantially equal to an absolute value of Vdata−Vcom−Vn;
- and in other one of the remaining two frames is substantially equal to an absolute value of Vdata−Vcom+Vn, where Vcom denotes the constant value of the common voltage, Vdata denotes the main data voltage, and Vn denotes an absolute value of the auxiliary voltage.
4 more elements
A liquid crystal display, comprising:
- a plurality of pixel units arranged in a matrix, each pixel unit comprising a pixel electrode and a common electrode;
- a data driving circuit configured for providing a plurality of data voltages to each pixel electrode, the data voltages applied to each pixel electrodes being a sum of a main data voltage and a first auxiliary voltage, the main data voltage having a square waveform, and the first auxiliary voltage being periodically changed at intervals each formed by four continuous frames;
- a common voltage generating circuit configured for providing a common voltage to each common electrode, the common voltage being a sum of a main common voltage and a second auxiliary voltage, the main common voltage being a constant value, and the second auxiliary voltage being periodically changed at intervals each formed by the four continuous frames;
- and
- a gamma voltage generating circuit configured for providing gamma voltages to the data driving circuit;
- wherein each of the first and second auxiliary voltages is less than a voltage difference between the main data voltage and the main common voltage, and one of the first and second auxiliary voltages is equal to zero in each frames;
- wherein in two frames of the four continuous frames, the voltage differences between the data voltages and the common voltage are substantially equal to an absolute value of Vdata−Vcom, and in remaining two frames of the two continuous frames, the voltage difference between the data voltages and common voltage in one of the remaining two frames is substantially equal to an absolute value of Vdata−Vcom−Vn;
- and in other one of the remaining two frames is substantially equal to an absolute value of Vdata−Vcom+Vn, where Vcom denotes the constant value of the main common voltage, Vdata denotes the main data voltage, and Vn denotes an absolute value of the other one of the first and second auxiliary voltages.
5 more elements
Dependencies are inferred from the claim text.