Liquid crystal display and a driving method thereof
First Claim
Patent Images
1. A liquid crystal display (LCD) comprising:
- an LCD panel comprising a plurality of gate lines for transmitting scanning signals, a plurality of data lines that cross the gate lines for transmitting image signals, and a plurality of pixels that are arranged in a matrix and have switching elements connected to the gate lines and the data lines;
a data gray signal modifier that receives gray signals from an external device, and modifies gray signals of a present frame based on gray signals of present and previous frames and at least a modification parameter including a temperature, an image quality selected by a user, and an environment of the LCD;
a gate driver sequentially applying the scanning signals to the gate lines; and
a data driver that converts the modified gray signals into data voltages and applies the data voltages to the data lines,wherein the data gray signal modifier includes a look-up table (LUT) for a reference value of the at least a modification parameter, the LUT has modification values for modifying gray signals, and each modification value of the LUT is represented by Gij, the present frame gray signal Gn matching with Gij is expressed as Gn=(i−
1)×
28−
y, and the previous frame gray signal Gn−
1 matching with Gij is expressed as Gn−
1=(j−
1)×
28−
y.
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Accused Products
Abstract
Disclosed is an LCD and driving method thereof. The LCD according to the present invention generates modification image signals by considering image signals of present and previous frames, and then supplies data voltages corresponding to the generated modification image signals to the data lines. At this time, the value for modifying the present frame image signal varies according to a modification parameter that is at least one among a temperature, an image quality selected by a user, and an environment of the LCD.
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Citations
20 Claims
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1. A liquid crystal display (LCD) comprising:
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an LCD panel comprising a plurality of gate lines for transmitting scanning signals, a plurality of data lines that cross the gate lines for transmitting image signals, and a plurality of pixels that are arranged in a matrix and have switching elements connected to the gate lines and the data lines; a data gray signal modifier that receives gray signals from an external device, and modifies gray signals of a present frame based on gray signals of present and previous frames and at least a modification parameter including a temperature, an image quality selected by a user, and an environment of the LCD; a gate driver sequentially applying the scanning signals to the gate lines; and a data driver that converts the modified gray signals into data voltages and applies the data voltages to the data lines, wherein the data gray signal modifier includes a look-up table (LUT) for a reference value of the at least a modification parameter, the LUT has modification values for modifying gray signals, and each modification value of the LUT is represented by Gij, the present frame gray signal Gn matching with Gij is expressed as Gn=(i−
1)×
28−
y, and the previous frame gray signal Gn−
1 matching with Gij is expressed as Gn−
1=(j−
1)×
28−
y. - View Dependent Claims (2, 3, 4)
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5. A method for driving a liquid crystal display (LCD), the LCD having a plurality of gate lines, a plurality of data lines insulated from and crossing the gate lines, and a plurality of pixels formed in an area surrounded by the gate lines and data lines and arranged as a matrix pattern arid having switching elements connected to the gate lines and data lines, the method comprising:
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(a) sequentially supplying scanning signals to the gate lines; (b) receiving image signals from an image signal source, and generating modification image signals from image signals of present and previous frames in accordance with one or more modification parameters; and (c) supplying data voltages corresponding to the generated modification image signals to the data lines, wherein the one or more modification parameters are at least one of a temperature, an image quality selected by a user, and an environment of the LCD, and wherein the generation of the modification image signals comprises; selecting one of a plurality of conversion tables containing modification values matching with the previous frame image signal and the present image signal for different values of the one or more modification parameters, wherein the generation of modification image signals further comprises; generating a new conversion table by converting the modification values of the selected conversion table according to a particular value of the one or more modification parameters, and generating the modification image signals based on the new conversion table. - View Dependent Claims (6, 7)
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8. A liquid crystal display (LCD), comprising:
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an LCD panel comprising a plurality of gate lines for transmitting scanning signals, a plurality of data lines that cross the gate lines for transmitting image signals, and a plurality of pixels that are arranged in a matrix and have switching elements connected to the gate lines and the data lines; a data gray signal modifier that receives gray signals from an external device, and modifies gray signals of a present frame (“
present gray signals) based on gray signals of present and previous frames and at least a modification parameter including a temperature, an image quality selected by a user, and an environment of the LCD;a gate driver sequentially applying the scanning signals to the gate lines; and a data driver that converts the modified array signals into data voltages and applies the data voltages to the data lines, wherein the data gray signal modifier includes a storage device including a plurality of look-up tables (LUT) for different values of the at least a modification parameter, each LUT storing modification values for modifying gray signals, wherein the data array signal modifier further comprises; an LUT selector selecting one of the plurality of LUT based on a value of the at least a modification parameter; and a modified signal generator that reads modification values corresponding to gray signals of present and previous frames from the selected LUT and generates the modified gray signals based on the modification values, wherein the LUT selector generates a coefficient value for converting modification values of the selected LUT based on a value of the at least a modification parameter, the data gray signal modifier further comprises an LUT converter converting modification values of the selected LUT based on the coefficient value to generate a modified LUT, and the modified signal generator reads modification values corresponding to gray signals of present and previous frames from the selected LUT or the modified LUT and generates the modified gray signals based upon the modification values. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A liquid crystal display (LCD), comprising:
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an LCD panel comprising a plurality of gate lines for transmitting scanning signals, a plurality of data lines that cross the gate lines for transmitting image signals, and a plurality of pixels that are arranged in a matrix and have switching elements connected to the gate lines and the data lines; a data gray signal modifier that receives a plurality of pairs of gray signals, each pair of gray signals including a gray signal of a present frame (“
present gray signal”
) and a gray signal of a previous frame (“
previous gray signal”
), and modifies the present gray signals based on the pairs of gray signals and at least a modification parameter including a temperature, an image quality selected by a user, and an environment of the LCD;a gate driver applying the scanning signals to the gate lines; and a data driver that converts the modified gray signals into data voltages and applies the data voltages to the data lines, wherein each of the present and the previous gray signals includes most significant bit (MSB) and least significant bit (LSB) and the data gray signal modifier includes at least a look-up table storing modification variables as function of pairs of MSBs of present and previous gray signals and a calculator generating the modified gray signals based on the modification variables and the LSB of the present gray signals, wherein the modification variables include first variable (f) related to each pair of MSBs and second and third variables (a and b) representing the difference between values of the first variable related to adjacent pairs of MSBs. - View Dependent Claims (16, 17)
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18. A liquid crystal display (LCD), comprising:
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an LCD panel comprising a plurality of gate lines for transmitting scanning signals, a plurality of data lines that cross the gate lines for transmitting image signals, and a plurality of pixels that are arranged in a matrix and have switching elements connected to the gate lines and the data lines; a data gray signal modifier that receives a plurality of pairs of gray signals, each pair of gray signals including a gray signal of a present frame (“
present gray signal”
) and a gray signal of a previous frame (“
previous gray signal”
), and modifies the present gray signals based on the pairs of gray signals and at least a modification parameter including a temperature, an image quality selected by a user, and an environment of the LCD;a gate driver applying the scanning signals to the gate lines; and a data driver that converts the modified gray signals into data voltages and applies the data voltages to the data lines, wherein each of the present and the previous gray signals includes most significant bit (MSB) and least significant bit (LSB) and the data gray signal modifier includes at least a look-up table storing modification variables as function of pairs of MSBs of present and previous gray signals and a calculator generating the modified gray signals based on the modification variables and the LSB of the present gray signals, wherein the at least a look-up table includes a plurality of look-up tables (LUT) for different values of the at least a modification parameter, wherein the data gray signal modifier further comprises; an LUT selector that selects one of the plurality of LUT and generates a coefficient value for converting modification variables of the selected LUT based on a value of the at least a modification parameter; and an LUT converter converting modification variables of the selected LUT based on the coefficient value to generate a modified LUT, and wherein the calculator calculates values of the modified gray signals from the modification variables corresponding to MSBs of present and previous gray signals from the selected LUT or the modified LUT and LSBs of the present gray signals, wherein the modification variables include a first variable (f) related to each pair of MSBs and second and third variables (a and b) representing the difference between values of the first variable related to adjacent pairs of MSBs. - View Dependent Claims (19, 20)
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Specification