Image display device and image display method
First Claim
1. An image display device for controlling brightness of a light source in accordance with average brightness of a picture input to the display device, comprising a peak detector for detecting a degree of peak level of a given input picture and a brightness control for correcting the brightness of the light source in accordance with the detected degree of peak level in a case when the average brightness is not more than a specified value.
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Accused Products
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.
134 Citations
20 Claims
- 1. An image display device for controlling brightness of a light source in accordance with average brightness of a picture input to the display device, comprising a peak detector for detecting a degree of peak level of a given input picture and a brightness control for correcting the brightness of the light source in accordance with the detected degree of peak level in a case when the average brightness is not more than a specified value.
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12. A display control method for controlling brightness of a light source in accordance with average brightness of a picture input to a display, comprising steps of:
- detecting a degree of peak level of a given input picture; and
correcting brightness of the light source in accordance with the detected degree of peak level in a case when the average brightness is not more than a specified value.
- detecting a degree of peak level of a given input picture; and
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13. A display control method for controlling brightness of a light source in accordance with average brightness of a picture input to a display, comprising steps of:
- detecting a degree of peak level of a given input picture; and
controlling the brightness of the light source by correcting the brightness in accordance with the detected degree of peak level in a case when the average brightness is not more than a specified value and controlling the brightness of the light source independently of the detected degree of peak level when the average brightness exceeds the specified value.
- detecting a degree of peak level of a given input picture; and
- 14. An image display device for controlling brightness of a light source in accordance with average brightness of an input picture, comprising a picture display portion, a light source, a light source control portion and an average brightness detecting portion, wherein a peak detecting portion is provided for detecting a degree of peak level of the input picture and the light source control portion has a characteristic changing point corresponding to an average brightness value obtainable as a result of detection by the average brightness detecting portion, controls the light source independently of a result of detection by the peak detecting portion when the detected average brightness value exceeds the characteristic changing point and corrects the screen brightness of the picture display portion by controlling the light source in accordance with the result of detection by the peak detecting portion when the average brightness value does not exceed the characteristic changing point.
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17. An image display device for controlling brightness of a light source based on an input picture, comprising:
- an average brightness detecting portion for detecting an average brightness of the input picture; and
a peak detecting portion for detecting a peak value of the input picture, wherein, in a case when the average brightness is not more than a specified value, the device increases the brightness of the light source as the input picture has a larger peak value. - View Dependent Claims (18)
- an average brightness detecting portion for detecting an average brightness of the input picture; and
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19. An image display device for controlling brightness of a light source based on an input picture, comprising:
- an average brightness detecting portion for detecting an average brightness of the input picture; and
a peak detecting portion for detecting the number of pixels in the input picture having a larger level than a preset value, wherein, in a case when the average brightness of the input picture is not more than a specified value, the device increases the brightness of the light source as the input picture has a larger number of pixels having a level larger than the preset value. - View Dependent Claims (20)
- an average brightness detecting portion for detecting an average brightness of the input picture; and
Specification