APPARATUS AND METHOD FOR CONTROLLING LIQUID CRYSTAL DISPLAY BRIGHTNESS, AND LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. An apparatus for controlling liquid crystal display brightness, the apparatus comprising:
- a zone image grayscale determining section configured to determine grayscale values of pixels in a zone image data block under a predetermined rule according to a received image signal;
a zone backlight value pre-obtaining section configured to pre-obtain a zone backlight value corresponding to the zone image data block according to the grayscale values;
a zone backlight value gain section configured, when it is determined that the zone backlight value is above a first threshold, to multiply the zone backlight value with a backlight value gain coefficient to obtain a backlight value to which a gain is applied, corresponding to the zone image data block, and to output the backlight value to which the gain is applied, to a driver circuit of backlight source in a backlight zone corresponding to the zone image data block, to control brightness of the backlight source in the corresponding backlight zone as a result of driving, where the backlight value gain coefficient is more than 1; and
a zone image grayscale compensating section configured, when it is determined that the zone backlight value is below a second threshold, to compensate for the grayscale values of pixels in the zone image data block using compensation coefficients respectively to obtain compensated image data for driving the liquid crystal panel, wherein the compensation coefficient is more than 1.
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Abstract
An apparatus for controlling liquid crystal display brightness includes: a zone image grayscale determining section configured to determine grayscale values of pixels in a zone image data block under a predetermined rule according to a received image signal; a zone backlight value pre-obtaining section configured to pre-obtain a zone backlight value corresponding to the zone image data block according to the grayscale values; a zone backlight value gain section configured, when it is determined that the zone backlight value is above a first threshold, to multiply the zone backlight value with a backlight value gain coefficient to obtain a backlight value to which a gain is applied, corresponding to the zone image data block, and to output the backlight value to which the gain is applied, to a driver circuit of backlight source in a backlight zone corresponding to the zone image data block, to control brightness of the backlight source in the corresponding backlight zone as a result of driving, where the backlight value gain coefficient is more than 1; and a zone image grayscale compensating section configured, when it is determined that the zone backlight value is below a second threshold, to compensate for the grayscale values of pixels in the zone image data block using compensation coefficients respectively to obtain compensated image data for driving the liquid crystal panel, wherein the compensation coefficient is more than 1.
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Citations
20 Claims
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1. An apparatus for controlling liquid crystal display brightness, the apparatus comprising:
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a zone image grayscale determining section configured to determine grayscale values of pixels in a zone image data block under a predetermined rule according to a received image signal; a zone backlight value pre-obtaining section configured to pre-obtain a zone backlight value corresponding to the zone image data block according to the grayscale values; a zone backlight value gain section configured, when it is determined that the zone backlight value is above a first threshold, to multiply the zone backlight value with a backlight value gain coefficient to obtain a backlight value to which a gain is applied, corresponding to the zone image data block, and to output the backlight value to which the gain is applied, to a driver circuit of backlight source in a backlight zone corresponding to the zone image data block, to control brightness of the backlight source in the corresponding backlight zone as a result of driving, where the backlight value gain coefficient is more than 1; and a zone image grayscale compensating section configured, when it is determined that the zone backlight value is below a second threshold, to compensate for the grayscale values of pixels in the zone image data block using compensation coefficients respectively to obtain compensated image data for driving the liquid crystal panel, wherein the compensation coefficient is more than 1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display device, comprising:
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a memory configured to store programs and various data; an apparatus for controlling liquid crystal display brightness configured to receive an image signal, to process the data, and to output image data to a timing controller so that the timing controller generates a driver signal according to the image data to control a liquid crystal panel to display an image; and
to output zone backlight values;a backlight processing unit configured to determine duty ratios of corresponding PWM signals according to the zone backlight values, and to output the duty ratios; and a PWM driver unit configured to generate PWM control signals according to the duty ratios to control backlight sources in backlight zones; wherein the apparatus for controlling liquid crystal display brightness comprises; a zone image grayscale determining section configured to determine grayscale values of pixels in a zone image data block under a predetermined rule according to a received image signal; a zone backlight value pre-obtaining section configured to pre-obtain a zone backlight value corresponding to the zone image data block according to the grayscale values; a zone backlight value gain section configured, when it is determined that the zone backlight value is above a first threshold, to multiply the pre-obtained zone backlight value with a backlight value gain coefficient to obtain a backlight value to which a gain is applied, corresponding to the zone image data block, and to output the backlight value to which the gain is applied, to a driver circuit of backlight source in a backlight zone comprising the zone image data block to control brightness of the backlight source in the backlight zone as a result of driving, where the backlight value gain coefficient is more than 1; and a zone image grayscale compensating section configured, when it is determined that the zone backlight value is below a second threshold, to compensate for the grayscale values of pixels in the zone image data block using compensation coefficients to obtain compensated image data for driving the liquid crystal panel, wherein the compensation coefficient is more than 1. - View Dependent Claims (10, 11, 12, 13)
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14. A method for controlling liquid crystal display brightness, the method comprising:
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determining, by a liquid crystal display device, grayscale values of pixels in a zone image data block under a predetermined rule according to a received image signal, and pre-obtaining a zone backlight value corresponding to the zone image data block according to the grayscale values; multiplying, by the liquid crystal display device, the zone backlight value with a backlight value gain coefficient to obtain a backlight value to which a gain is applied, corresponding to the zone image data block, when it is determined that the zone backlight value is above a first threshold, and outputting, by the liquid crystal display device, the backlight value to which the gain is applied, to a driver circuit of backlight source in a backlight zone corresponding to the zone image data block, to control brightness of the backlight source in the backlight zone as a result of driving, wherein the backlight value gain coefficient is more than 1; and compensating, by the liquid crystal display device, for the grayscale values of pixels in the zone image data block using compensation coefficients respectively to obtain compensated image data for driving a liquid crystal panel, when it is determined that the zone backlight value is below a second threshold, wherein each of the compensation coefficients is more than 1. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification