DISPLAY DEVICE, DISPLAY DRIVER AND IMAGE DISPLAY METHOD
First Claim
Patent Images
1. A drive circuit of an image display device for displaying an image by irradiating a backlight on a display screen, the drive circuit comprising:
- a backlight control unit which includes;
a histogram counting unit for acquiring a histogram by counting display data in units of frame of one or plural images and calculating a value of the display data at a specific upper position of the histogram;
a display data extension unit for extending each display data based on the value of the display data at the specific position; and
a backlight adjustment unit for adjusting a light emission amount of the backlight based on the value of the display data at the specific position,wherein the histogram counting unit includes a weighting coefficient calculating unit for outputting a weighting coefficient corresponding to a display position of each display data on the display screen, and counts the display data while adding the weighting coefficient to each display data, thereby acquiring the histogram.
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Abstract
In a display device and a display driver, when a grayscale of a display image is equal to or lower than a specific grayscale value obtained from a histogram of the display image, a display grayscale is extended with a linear function. On the other hand, when a grayscale of a display image is equal to or higher than the specific grayscale value, histogram equalization of a part higher than the specific grayscale value is performed, and the display grayscale is extended with a non-linear function obtained from the histogram equalization.
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Citations
13 Claims
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1. A drive circuit of an image display device for displaying an image by irradiating a backlight on a display screen, the drive circuit comprising:
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a backlight control unit which includes;
a histogram counting unit for acquiring a histogram by counting display data in units of frame of one or plural images and calculating a value of the display data at a specific upper position of the histogram;
a display data extension unit for extending each display data based on the value of the display data at the specific position; and
a backlight adjustment unit for adjusting a light emission amount of the backlight based on the value of the display data at the specific position,wherein the histogram counting unit includes a weighting coefficient calculating unit for outputting a weighting coefficient corresponding to a display position of each display data on the display screen, and counts the display data while adding the weighting coefficient to each display data, thereby acquiring the histogram. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A drive circuit of an image display device for displaying an image by irradiating a backlight on a display screen, the drive circuit comprising:
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a backlight control unit which includes;
a histogram counting unit for acquiring a histogram by counting display data in units of frame of one or plural images and calculating a value of the display data at a specific upper position of the histogram;
a display data extension unit for extending each display data based on the value of the display data at the specific position; and
a backlight adjustment unit for adjusting a light emission amount of the backlight based on the value of the display data at the specific position,wherein the histogram counting unit includes a weighting coefficient calculating unit for outputting a weighting coefficient corresponding to a content of display data of a predetermined region of the display screen, and counts the display data while adding the weighting coefficient to each display data, thereby acquiring the histogram. - View Dependent Claims (9, 10)
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11. An image display method for displaying an image by irradiating a backlight on a display screen,
wherein a backlight control unit executes the processes of: - acquiring a histogram by counting display data in units of frame of one or plural images and calculating a value of the display data at a specific upper position of the histogram;
extending each display data based on the value of the display data at the specific position; and
adjusting a light emission amount of the backlight based on the value of the display data at the specific position, andwhen acquiring the histogram by counting the display data, a weighting coefficient corresponding to a display position of each display data on the display screen is acquired, and the display data is counted while adding the weighting coefficient, thereby acquiring the histogram. - View Dependent Claims (12, 13)
- acquiring a histogram by counting display data in units of frame of one or plural images and calculating a value of the display data at a specific upper position of the histogram;
Specification