Image display apparatus
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Abstract
An image display device according to the present invention is capable of presenting to a viewer a high-quality lustrous video on a display screen with best screen brightness by increasing visual contrast and avoiding loss of true black elements without widening a dynamic range of a picture signal. The image display device is provided with a liquid crystal display portion (11), a display control portion (14), a backlight (12), a backlight control portion (13) and an average brightness detecting portion (15) and detects brightness of the light source in accordance with the average brightness of a picture signal to be displayed. It is further provided with a peak detecting portion (16) and corrects the control of the backlight control portion (13) in accordance with a detected peak value of a picture.
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Citations
100 Claims
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1-62. -62. (Cancelled).
- 63. A liquid crystal display device capable of controlling brightness of a light source in accordance with average brightness of an input picture, wherein the device is provided with a peak detecting means for detecting a degree of peak level of the input picture in a plurality of stages and increases the brightness of the light source as the input picture has a larger degree of peak level.
- 65. A liquid crystal display device capable of controlling brightness of a light source in accordance with average brightness of an input picture, wherein the device is provided with a peak detecting means for detecting a degree of peak level of the input picture in a plurality of stages and decreases the brightness of the light source as the input picture has a smaller degree of peak level.
- 68. A liquid crystal display device capable of controlling brightness of a light source in accordance with average brightness of an input picture, wherein the device is provided with a peak detecting means for detecting a degree of peak level of the input picture in a plurality of stages and corrects a control characteristic of the brightness of the light source in relation to the average brightness of the input picture so as to increase the brightness of the light source as the input picture has a larger degree of peak level.
- 70. A liquid crystal display device capable of controlling brightness of a light source in accordance with average brightness of an input picture, wherein the device is provided with a peak detecting means for detecting a degree of peak level of the input picture in a plurality of stages and corrects a control characteristic of the brightness of the light source in relation to the average brightness of the input picture so as to decrease the brightness of the light source as the input picture has a smaller degree of peak level.
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81. A display control method for controlling brightness of a light source in accordance with average brightness of an input picture, comprising steps of:
- detecting a degree of peak level of the input picture in a plurality of stages; and
increasing the brightness of the light source as the input picture has a larger degree of peak level.
- detecting a degree of peak level of the input picture in a plurality of stages; and
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82. A display control method for controlling brightness of a light source in accordance with average brightness of an input picture, comprising steps of:
- detecting a degree of peak level of the input picture in a plurality of stages; and
decreasing the brightness of the light source as the input picture has a smaller degree of peak level.
- detecting a degree of peak level of the input picture in a plurality of stages; and
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83. A display control method for controlling brightness of a light source in accordance with average brightness of an input picture, comprising steps of:
- detecting a degree of peak level of the input picture in a plurality of stages; and
correcting a control characteristic of the light source in relation to the average brightness of the input picture so as to increase the light source of the brightness of the light source as the input picture has a larger degree of peak level.
- detecting a degree of peak level of the input picture in a plurality of stages; and
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84. A display control method for controlling brightness of a light source in accordance with average brightness of an input picture, comprising steps of:
- detecting a degree of peak level of the input picture in a plurality of stages and correcting a control characteristic of the light source in relation to the average brightness of the input picture so as to decrease the brightness of the light source as the input picture has a smaller degree of peak level.
- 85. An image display device capable of controlling brightness of a light source in accordance with average brightness of an input picture, wherein the device is provided with a peak detecting means for detecting a degree of peak level of the input picture in a plurality of stages and corrects the brightness of the light source in accordance with the degree of peak level in a case when the average brightness of the input picture is not more than a preset value.
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96. A display control method for controlling brightness of a light source in accordance with average brightness of an input picture, comprising steps of:
- detecting a degree of peak level of the input picture in a plurality of stages; and
correcting brightness of the light source in accordance with the degree of peak level in a case when the average brightness of the input picture is not more than a preset value.
- detecting a degree of peak level of the input picture in a plurality of stages; and
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97. A display control method for controlling brightness of a light source in accordance with average brightness of an input picture, comprising steps of:
- detecting a degree of peak level of the input picture in a plurality of stages; and
controlling the brightness of the light source by correcting the brightness in accordance with the degree of peak level in a case when the average brightness of the input picture is not more than a preset value and controlling the brightness of the light source independently of the degree of peak level when the average brightness of the input picture exceeds the preset value.
- detecting a degree of peak level of the input picture in a plurality of stages; and
- 98. An image display device capable of controlling brightness of a light source in accordance with average brightness of an input picture, comprising a picture display means, a light source, a light source control means and an average brightness detecting means, wherein a peak detecting means is provided for detecting a degree of peak level of the input picture and the light source control means has a characteristic changing point corresponding to an average brightness value obtainable as a result of detection by the average brightness detecting means, controls the light source independently of a result of detection by the peak detecting means when the detected average brightness value exceeds the characteristic changing point and corrects the screen brightness of the image display means by controlling the light source in accordance with the result of detection by the peak detecting means when the average brightness value does not exceed the characteristic changing point.
Specification