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.
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Citations
45 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 connected with the data lines for outputting gray scale voltages corresponding to display data consisting of a plurality of bits to the pixels via the data lines; wherein the driver outputs the gray scale voltages having polarity different from each other to an adjacent two data lines; wherein an adjacent two pixels on the display panel connected to the adjacent two data lines have polarity different from each other; and wherein the driver makes outputs from the driver to the data lines to be in a high impedance state before the gray scale voltages are output to the pixels. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A display device comprising:
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a display panel having a plurality of pixels; and a driver, having output terminals (Y1, Y2) provided for data lines connected to the pixels, for outputting 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; wherein a polarity of the gray scale voltage output from the output terminal (Y1) at an odd-numbered position is different from a polarity of the gray scale voltage output from the output terminal (Y2) at an even-numbered position, wherein the polarity of the voltage at the pixel connected to the odd-numbered output terminal (Y1) via the data line is different from the polarity of the voltage at the pixel connected to the even-numbered output terminal (Y2) via the data line; and wherein the driver makes the outputs from the output terminals to be in the high impedance state before the gray scale voltages are output to the pixels. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A display device comprising:
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a display panel having a plurality of pixels; and a driver, having output terminals (Y1, Y2) provided for data lines connected to the pixels, for outputting gray scale voltage corresponding to display data consisting of a plurality of bits to the pixel from the output terminal via the data line; wherein the driver makes the outputs from the output terminals to be in a high impedance state before the gray scale voltages are output to the pixels. - View Dependent Claims (31, 32, 33, 34)
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35. 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, 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 a polarity different from each other to an adjacent two data lines; wherein the voltages at an adjacent two pixels on the display panel connected to the adjacent two data lines have a polarity different from each other; and wherein the driver connects the outputs from the driver to the data lines with each other before the gray scale voltages are output to the pixels. - View Dependent Claims (36, 37, 38)
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39. 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, 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 a polarity different from each other to an adjacent two data lines; wherein the voltages at an adjacent two pixels on the display panel connected to the adjacent two data lines have a polarity different from each other, and wherein the driver provides an equalizing period during which the gray scale voltages are not output to the pixels just before the gray scale voltages are output to the pixels. - View Dependent Claims (40, 41, 42, 43, 44, 45)
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Specification