DISPLAY DRIVER
First Claim
Patent Images
1. A display driver comprising:
- a first control unit switching brightness of a display image based on a display data value at a predetermined position of a histogram of inputted display data and switching backlight luminance based on the display data value, wherein an object of detection of the histogram is a data range from a brightest level to an N-th level of gray-scale (N is a positive integer and is not
0) of the display data;
a second control unit performing backlight luminance control different from the first control unit; and
a generating unit setting a backlight control signal value consisting of a product of a luminance rate of X % and a luminance rate of Y % as a luminance rate of a backlight control signal for controlling a backlight with respect to maximum backlight luminance when a luminance rate of a backlight control signal obtained by a processing of the first control unit with respect to the maximum backlight luminance is defined as X % (0<
X≦
100) and a luminance rate of a backlight control signal obtained by a processing of the second control unit with respect to the maximum backlight luminance is defined as Y % (0<
Y<
100).
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Abstract
In a display driver, a first backlight control unit using a histogram and a second backlight control unit using an optical sensor can be used in combination. The display driver includes a PWM generating unit setting a control signal value consisting of a product of a luminance rate of X % and a luminance rate of Y % as a luminance rate of a control signal for controlling a backlight with respect to maximum backlight luminance when a luminance rate of a control signal obtained by first backlight control with respect to the maximum backlight luminance is X % and a luminance rate of a control signal obtained by second backlight control with respect to the maximum backlight luminance is Y %.
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Citations
20 Claims
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1. A display driver comprising:
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a first control unit switching brightness of a display image based on a display data value at a predetermined position of a histogram of inputted display data and switching backlight luminance based on the display data value, wherein an object of detection of the histogram is a data range from a brightest level to an N-th level of gray-scale (N is a positive integer and is not
0) of the display data;a second control unit performing backlight luminance control different from the first control unit; and a generating unit setting a backlight control signal value consisting of a product of a luminance rate of X % and a luminance rate of Y % as a luminance rate of a backlight control signal for controlling a backlight with respect to maximum backlight luminance when a luminance rate of a backlight control signal obtained by a processing of the first control unit with respect to the maximum backlight luminance is defined as X % (0<
X≦
100) and a luminance rate of a backlight control signal obtained by a processing of the second control unit with respect to the maximum backlight luminance is defined as Y % (0<
Y<
100). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A display driver comprising:
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a first control unit switching brightness of a display image based on a display data value at a predetermined position of a histogram of inputted display data and switching backlight luminance based on the display data value, wherein an object of detection of the histogram is a data range from a brightest level to an N-th level of gray-scale (N is a positive integer and is not
0) of the display data;a second control unit performing backlight luminance control different from the first control unit; and a generating unit setting a backlight control signal value of a luminance rate of Y % as a luminance rate of a backlight control signal for controlling a backlight with respect to backlight maximum luminance when a luminance rate of a backlight control signal obtained by a processing of the second control with respect to the backlight maximum luminance is Y % and the luminance rate of Y % is smaller than a luminance rate of Q % with respect to the backlight maximum luminance set as a threshold, wherein when the luminance rate of Y % is smaller than the luminance rate of Q % with respect to the backlight maximum luminance set as a threshold, a processing of the first control unit is stopped. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A display driver comprising:
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a first control unit switching brightness of a display image based on a display data value at a predetermined position of a histogram of inputted display data and switching backlight luminance based on the display data value, wherein an object of detection of the histogram is a data range from a brightest level to an N-th level of gray-scale (N is a positive integer and is not
0) of the display data; andsecond to K-th (K is an integer equal to or larger than
3) control units performing backlight luminance control different from the first control unit,wherein one of the second to K-th control units and the first control unit are used in combination.
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16. A display driver for driving a display device including a backlight comprising:
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a first control unit outputting a first control signal for controlling luminance of the backlight based on a histogram of inputted display data; a second control unit outputting a second control signal for controlling the luminance of the backlight based on a luminance signal detected by a sensor; and a generating unit including a circuit multiplying the first control signal and the second control signal together and controlling the luminance of the backlight based on a third control signal from the circuit. - View Dependent Claims (17, 18)
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19. A display driver for driving a display device including a backlight comprising:
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a generating unit generating a plurality of gray-scale voltages; a decoder decoding a gray-scale voltage from inputted display data with reference to the plurality of gray-scale voltages from the generating unit; and a control unit controlling luminance of the backlight based on a control signal obtained by multiplying a first control signal based on a histogram of the inputted display data and a second control signal based on a luminance signal detected by a sensor. - View Dependent Claims (20)
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Specification