Liquid crystal driver and liquid crystal display device using the same
First Claim
Patent Images
1. A liquid crystal driver comprising:
- a plurality of output terminals for outputting display voltages to be applied to a liquid crystal display device;
an input terminal for receiving display data corresponding to said plurality of output terminals; and
output means for converting said input display data into said output display voltages;
wherein said output means selects a display voltage level corresponding to one input display data and simultaneously generates two different display voltages from the selected display voltage level so that either one of said two different display voltages can be selected as an output display voltage for each of said output terminals.
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Abstract
A liquid crystal driver includes a voltage generator for generating gray scale voltages on the basis of reference voltages, and an output device for selecting one gray scale voltage from the generated gray scale voltages in accordance with display data, for applying inversion/non-inversion control to the selected gray scale voltage with respect to an inversion reference voltage on the basis of the selected gray scale voltage, an AC switching signal and the inversion reference voltage, and for outputting different liquid crystal supply voltages for one and the same display data to a liquid crystal panel.
23 Citations
29 Claims
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1. A liquid crystal driver comprising:
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a plurality of output terminals for outputting display voltages to be applied to a liquid crystal display device;
an input terminal for receiving display data corresponding to said plurality of output terminals; and
output means for converting said input display data into said output display voltages;
wherein said output means selects a display voltage level corresponding to one input display data and simultaneously generates two different display voltages from the selected display voltage level so that either one of said two different display voltages can be selected as an output display voltage for each of said output terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of applying display voltages to a liquid crystal display device, the method comprising the steps of:
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receiving display data corresponding to output terminals which output display voltages;
generating gray scale display voltage levels on the basis of reference voltages;
selecting one of the gray scale display voltage levels for each output terminal in accordance with said display data, the selected gray scale display voltage level being a first display voltage for the output terminal;
supplying an AC switching signal and an inversion reference voltage, said AC switching signal having a polarity which is periodically inverted;
inverting said selected gray scale voltage level with respect to said inversion reference voltage to generate an inverted selected gray scale display voltage level, the inverted selected gray scale display voltage level being a second display voltage for the output terminal, the second display voltage being different from the first display voltage, the first display voltage and the second display voltage being available simultaneously;
selecting one of the first display voltage and the second display voltage in accordance with the AC switching signal as an output display voltage for the output terminal; and
outputting the output display voltage from the output terminal.
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17. A display device comprising:
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a display panel having a plurality of pixels arranged corresponding to crossing points of a plurality of data lines and a plurality of scan lines; and
a driver being arranged on a single side of the display panel and connected with the data lines for outputting gray scale voltages corresponding to display data consisting of a plurality bits to the pixels via the data lines;
wherein the driver outputs the gray scale voltages having polarity different from each other to adjacent two data lines;
wherein the driver includes;
a first amplifier for outputting the gray scale voltage having a positive polarity corresponding to the display data to one of the adjacent two data lines;
a second amplifier for outputting the gray scale voltage having a negative polarity corresponding to the display data to an other of the adjacent two data lines; and
a selector for switching an output destination of the positive polarity gray scale voltage output from the first amplifier between the one of the adjacent two data lines and the other of the adjacent two data lines while switching an output destination of the negative polarity gray scale voltage output from the second amplifier between the other of the adjacent two data lines and the one of the adjacent two data lines;
wherein the adjacent two pixels on the display panel connected to the adjacent two data lines having polarity different from each other. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A display device comprising:
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a display panel having a plurality of pixels;
a driver being arranged on a single side of the display panel;
wherein the driver has output terminals provided for data lines connected to pixels and outputs gray scale voltages corresponding to display data for each pixel consisting of a plurality of bits to the pixel from the output terminal via the data line, and a polarity of the gray scale voltage output from the output terminal at an odd-numbered position is different from a polarity of the gray scale voltage output from the output terminal at an even-numbered position, wherein the driver includes;
a first amplifier for outputting a positive polarity gray scale voltage corresponding to the display data to the odd-numbered position output terminal;
a second amplifier for outputting a negative polarity gray scale voltage corresponding to the display data to the even-numbered position output terminal; and
a selector for switching an output destination of the positive polarity gray scale voltage output from the first amplifier between the odd-numbered position output terminal and the even-numbered position output terminals while switching an output destination of the negative polarity gray scale voltage output from the second amplifier between the even-numbered position output terminal and the odd number position output terminal;
wherein the polarity of the voltage of the pixel connected with the odd-numbered position output terminal via the data line is different from the polarity of the voltage of the pixel connected with the even-numbered position output terminal via the data line. - View Dependent Claims (24, 25, 26, 27)
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28. A display device, which inverts polarity of voltage at pixels every row or dot, comprising:
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a display panel having a plurality of pixels arranged corresponding to crossing points of a plurality of data lines and a plurality of scan lines; and
a driver being arranged on a single side of the display panel for outputting gray scale voltages corresponding to display data consisting of a plurality bits to the pixels via the data lines;
wherein the driver includes;
output terminals provided corresponding to the data lines;
amplifiers provided corresponding to the output terminals for outputting the gray scale voltage corresponding to the display data; and
a selector for switching a connection between the amplifier and the output terminal;
wherein the adjacent two amplifiers are shared by the adjacent two output terminals; and
wherein the selector switches the connections between the adjacent two amplifiers and the adjacent two output terminals with each other. - View Dependent Claims (29)
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Specification