BACKLIGHT BRIGHTNESS ADJUSTMENT METHOD AND APPARATUS
First Claim
1. A backlight brightness adjustment method, wherein the backlight brightness adjustment method comprises the following steps:
- dividing a backlight area of a liquid crystal display (LCD) into multiple sub-areas, acquiring maximum pixel brightness M of each sub-area, and acquiring average pixel brightness A according to the maximum pixel brightness M;
classifying the brightness into multiple brightness ranges, and separately adjusting duty cycles and drive currents of a backlight source in different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M;
determining, according to the maximum pixel brightness M of each sub-area, a brightness range of the sub-area, and acquiring an adjusted duty cycle and drive current that correspond to the brightness range of each sub-area; and
correspondingly controlling illumination brightness of each sub-area by using the adjusted duty cycle and drive current.
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Abstract
Disclosed are a backlight brightness adjustment method and apparatus. The backlight brightness adjustment method includes the following steps: dividing a backlight area of a liquid crystal display (LCD) into multiple sub-areas, acquiring maximum pixel brightness M of each sub-area, and acquiring average pixel brightness A according to the maximum pixel brightness M; classifying the brightness into multiple brightness ranges, and separately adjusting duty cycles and drive currents of a backlight source in different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M; determining, according to the maximum pixel brightness M of each sub-area, a brightness range of the sub-area, and acquiring an adjusted duty cycle and drive current that correspond to the brightness range of each sub-area; and correspondingly controlling illumination brightness of each sub-area by using the adjusted duty cycle and drive current. The present invention improves contrast of an LCD.
84 Citations
18 Claims
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1. A backlight brightness adjustment method, wherein the backlight brightness adjustment method comprises the following steps:
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dividing a backlight area of a liquid crystal display (LCD) into multiple sub-areas, acquiring maximum pixel brightness M of each sub-area, and acquiring average pixel brightness A according to the maximum pixel brightness M; classifying the brightness into multiple brightness ranges, and separately adjusting duty cycles and drive currents of a backlight source in different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M; determining, according to the maximum pixel brightness M of each sub-area, a brightness range of the sub-area, and acquiring an adjusted duty cycle and drive current that correspond to the brightness range of each sub-area; and correspondingly controlling illumination brightness of each sub-area by using the adjusted duty cycle and drive current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16)
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8. A backlight brightness adjustment apparatus, wherein the apparatus comprises:
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an acquiring module, configured to divide a backlight area of a liquid crystal display (LCD) into multiple sub-areas, acquire maximum pixel brightness M of each sub-area, and acquire average pixel brightness A according to the maximum pixel brightness M; an adjustment module, configured to classify the brightness into multiple brightness ranges, and separately adjust duty cycles and drive currents of a backlight source in different brightness ranges according to the average pixel brightness A and the maximum pixel brightness M; a determining module, configured to determine, according to the maximum pixel brightness M of each sub-area, a brightness range of the sub-area, and acquire an adjusted duty cycle and drive current that correspond to the brightness range of each sub-area; and a control module, configured to correspondingly control illumination brightness of each sub-area by using the adjusted duty cycle and drive current. - View Dependent Claims (9, 10, 11, 12, 13, 14, 17, 18)
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Specification