Display device for displaying an image if a positive voltage or a negative pole voltage is applied as an image voltage to a pixel electrode
AssigneeSharp Kabushiki Kaisha
InventorYusuke Nii
Life of this patent
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Abstract
In a display device of the present invention, a positive pole voltage and a negative pole voltage at which flicker is less likely to occur are calculated in advance. In memory tables, as voltages to be applied to liquid crystal, data of the positive pole voltage is stored, and, instead of the negative pole voltage, a correction value that allows for calculating the negative pole voltage when used in combination with the positive pole voltage is stored. In this way, it is possible to make appearance of the flicker less likely. In addition, it is possible to reduce memory size (specifically, by (A−B)×27 bits) and thereby reduce packaging area and attain lower cost.
Claims15
A display device for displaying an image when a positive pole voltage or a negative pole voltage is applied as an image voltage to a pixel electrode, an opposed voltage is applied to an opposed electrode, and a pixel voltage is applied to a pixel as a difference between the image voltage and the opposed voltage, wherein:
- the positive pole voltage and the negative pole voltage are determined with respect to each gradation, an opposed voltage at which flicker is minimized and a representing value of the opposed voltage are determined, and a difference between the opposed voltage and the representing value of the opposed voltage is calculated;
- the difference is added to the positive pole voltage and the negative pole voltage, the opposed voltage is set to the representing value, a gamma value is set to a predetermined value, a center voltage value and the opposed voltage are fixed, and, while changing gradations, the positive pole voltage and the negative pole voltage are adjusted so that values of the positive pole voltage and the negative pole voltage are on a gradation-luminance curve that is associated with the gamma value;
- if one of the positive pole voltage or the negative pole voltage is a first pole voltage, and the other of the positive pole voltage or the negative pole voltage is a second pole voltage,
- a value of the first pole voltage is stored in a voltage data storing section;
- and
- a correction value, which is a difference between a value of the second pole voltage and 1's complement of the value of the first pole voltage, is stored in the voltage data storing section,
- the display device further comprising a voltage data generating section for calculating a value of the second pole voltage that is associated with the value of the first pole voltage, by using the first pole voltage and the correction value at a time of display processing.
A display device for displaying an image when a positive pole voltage or a negative pole voltage is applied as an image voltage to a pixel electrode, an opposed voltage is applied to an opposed electrode, and a pixel voltage is applied to a pixel as a difference between the image voltage and the opposed voltage, wherein:
- the positive pole voltage and the negative pole voltage are determined with respect to each gradation, an opposed voltage at which flicker is minimized and a representing value of the opposed voltage are determined, and a difference between the opposed voltage and the representing value of the opposed voltage is calculated;
- the difference is added to the positive pole voltage and the negative pole voltage, the opposed voltage is set to the representing value, a gamma value is set to a predetermined value, a center voltage value and the opposed voltage are fixed, and, while changing gradations, the positive pole voltage and the negative pole voltage are adjusted so that values of the positive pole voltage and the negative pole voltage are on a gradation-luminance curve that is associated with the gamma value;
- if one of the positive pole voltage or the negative pole voltage is a first pole voltage, and the other of the positive pole voltage or the negative pole voltage is a second pole voltage,
- a value of the first pole voltage is stored in a voltage data storing section;
- and
- a correction value is stored in the voltage data storing section, the correction value being a value that allows for calculating a desired value of the second pole voltage when used in combination with the first pole voltage, and the number of bits required for the correction value being smaller than the number of bits required for the value of the second pole voltage,
- the display device further comprising a voltage data generating section for calculating a value of the second pole voltage that is associated with the value of the first pole voltage, by using the first pole voltage and the correction value at a time of display processing.
Dependencies are inferred from the claim text.