Apparatus and method for correcting gamma voltage and video data in liquid crystal display
First Claim
1. A gamma voltage correcting apparatus for a liquid crystal display wherein a liquid crystal pixel is arranged at each intersection between data lines and gate lines and video data is corrected by a preset gamma voltage to display an image, said apparatus comprising:
- memory means for storing gamma data for controlling the gamma voltage for each of at least two modes;
control means for accessing the gamma data for each mode in response to an instruction from a user; and
a multi-channel gamma voltage generator for responding to the gamma data for a mode selected by the control means to generate n gamma voltages (wherein n is an integer) having a different voltage level indicated by the gamma data for the selected mode.
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Abstract
A gamma voltage and video data correcting apparatus and method in a liquid crystal display that is capable of improving a display quality of the LCD, wherein gamma data for controlling the gamma voltage is stored for each of at least two modes. The gamma data for each mode is accessed in response to an instruction from a user to select any one of the gamma data for each mode. In response to the gamma data for the selected mode, n gamma voltages (wherein n is an integer), each having a different voltage level, indicated by the gamma data in the selected mode are generated. In the video data correcting method, a lookup table is provided in which a color temperature correction data for correcting a color temperature characteristic of an input image is set in correspondence with a gray level value of the input image. The lookup table is accessed in accordance with the gray level value of the input image to read out color temperature correction data corresponding to the gray level value of the input image. The data lines are driven by the color temperature correction data.
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Citations
33 Claims
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1. A gamma voltage correcting apparatus for a liquid crystal display wherein a liquid crystal pixel is arranged at each intersection between data lines and gate lines and video data is corrected by a preset gamma voltage to display an image, said apparatus comprising:
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memory means for storing gamma data for controlling the gamma voltage for each of at least two modes;
control means for accessing the gamma data for each mode in response to an instruction from a user; and
a multi-channel gamma voltage generator for responding to the gamma data for a mode selected by the control means to generate n gamma voltages (wherein n is an integer) having a different voltage level indicated by the gamma data for the selected mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A video data correcting apparatus for a liquid crystal display which includes a liquid crystal panel having a liquid crystal pixel arranged at each intersection between data lines and the gate lines, said apparatus comprising:
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memory means for storing a lookup table in which color temperature correction data for correcting a color temperature characteristic of an input image is set in correspondence with a gray level value of the input image;
memory control means for accessing the lookup table of the memory means in accordance with the gray level value of the input image to read out the color temperature correction data corresponding to the gray level value of the input image; and
data driving means for driving the data lines using the color temperature correction data from the memory control means. - View Dependent Claims (10, 11, 12, 14, 15, 16, 17, 19, 20)
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13. A method of correcting a gamma voltage in a liquid crystal display wherein a liquid crystal pixel is arranged at each intersection between data lines and gate lines and video data is corrected by a preset gamma voltage to display an image, said method comprising:
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storing gamma data for controlling the gamma voltage for each of at least two modes;
accessing the gamma data for each mode in response to an instruction from a user;
selecting any one of the gamma data for each mode; and
responding to the gamma data for the selected mode to generate n gamma voltages (wherein n is an integer) having a different voltage level indicated by the gamma data in the selected mode.
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18. A method of correcting video data in a liquid crystal display which includes a liquid crystal panel having a liquid crystal pixel arranged at each intersection between data lines and gate lines, said method comprising:
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providing a lookup table in which color temperature correction data for correcting a color temperature characteristic of an input image is set in correspondence with a gray level value of the input image;
accessing the lookup table in accordance with the gray level value of the input image to read out color temperature correction data corresponding to the gray level value of the input image; and
driving the data lines using the color temperature correction data.
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21. A device for providing a desired gamma voltage for a liquid crystal display (LCD), said device comprising:
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a memory for storing gamma data corresponding to a plurality of modes;
a controller for receiving an external mode signal and in response thereto selecting selected gamma data from the memory; and
means for generating a plurality of gamma reference voltages according to the selected gamma data. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33)
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29. A method of providing a desired gamma voltage for a liquid crystal display, comprising:
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storing gamma data corresponding to a plurality of modes in a memory device;
receiving an external mode signal and in response thereto selecting selected gamma data from the memory; and
generating a plurality of gamma reference voltages according to the selected gamma data.
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Specification