Control circuit of panel brightness
First Claim
1. A control circuit of panel brightness, which responds to an adjustment signal to adjust a panel brightness, comprises:
- a pre-stage circuit, for receiving the adjustment signal to obtain a darkness-adjusting signal and a brightness-adjusting signal, the pre-stage circuit further outputting an enable signal related to the darkness-adjusting signal and the brightness-adjusting signal;
a first brightness control circuit, for outputting an adjusted first brightness value and receiving the first brightness value, the first brightness control circuit controlled by the enable signal, the darkness-adjusting signal and the brightness-adjusting signal, wherein the first brightness value is obtained according to the related first brightness value and an interval; and
a second brightness control circuit, for outputting an adjusted second brightness value, and receiving a second brightness value, the second brightness control circuit controlled by the enable signal, the darkness-adjusting signal and the brightness-adjusting signal, wherein the second brightness value is obtained according to the second brightness value and an interval;
wherein the first brightness value and the second brightness value are used for adjusting panel brightness.
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Accused Products
Abstract
A control circuit of panel brightness is disclosed. After a user adjusts a brightness volume control, the brightness volume control will output an adjusting signal. The control circuit of this invention includes a pre-stage circuit, a first brightness control circuit, and a second brightness control circuit. The pre-stage circuit is fro receiving a darkness-adjusting signal, a brightness-adjusting signal, and an enable signal. A first brightness value outputted from the first brightness control circuit can be the first brightness value of the previous time point plus or minus a interval. A second brightness value outputted from the second brightness control circuit can be the second brightness value of the previous time point plus or minus a interval. The first brightness value and the second brightness value are for adjusting panel brightness. The circuit of this invention is simple, easy to design, and less cost.
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Citations
17 Claims
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1. A control circuit of panel brightness, which responds to an adjustment signal to adjust a panel brightness, comprises:
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a pre-stage circuit, for receiving the adjustment signal to obtain a darkness-adjusting signal and a brightness-adjusting signal, the pre-stage circuit further outputting an enable signal related to the darkness-adjusting signal and the brightness-adjusting signal;
a first brightness control circuit, for outputting an adjusted first brightness value and receiving the first brightness value, the first brightness control circuit controlled by the enable signal, the darkness-adjusting signal and the brightness-adjusting signal, wherein the first brightness value is obtained according to the related first brightness value and an interval; and
a second brightness control circuit, for outputting an adjusted second brightness value, and receiving a second brightness value, the second brightness control circuit controlled by the enable signal, the darkness-adjusting signal and the brightness-adjusting signal, wherein the second brightness value is obtained according to the second brightness value and an interval;
wherein the first brightness value and the second brightness value are used for adjusting panel brightness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control circuit of panel brightness, which responds to an adjustment signal to adjust the panel brightness, comprises:
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a pre-stage circuit, for receiving the adjustment signal to obtain a darkness-adjusting signal and a brightness-adjusting signal, the pre-stage circuit further outputting an enable signal related to the darkness-adjusting signal and the brightness-adjusting signal;
a first brightness control circuit, for outputting an adjusted first brightness value, comprising;
a first adder, controlled by an enable signal, for receiving the first brightness value in a previous time point and, outputting a first adjusted brightness value, the first adjusted brightness value being equal to the sum of the first brightness value and the interval, or the subtraction of the interval from the first brightness value;
a first limiter, for receiving the first adjusted brightness value, and outputting a first limiter output related to the first adjusted brightness value, the first limiter output being between the first upper limit value and the first lower limit value; and
a first flip-flop, for receiving the first limiter output, and outputting the first brightness value when triggered by the enable signal; and
a second brightness control circuit, for outputting an adjusted second brightness value, comprising;
a second adder, controlled by an enable signal, for receiving the second brightness value and outputting a second adjusted brightness value, the second adjusted brightness value being equal to the sum of the second brightness value and the interval, or the subtraction of the interval from the second brightness value;
a second limiter, for receiving the second adjusted brightness value, and outputting a second limiter output related to the second adjusted brightness value, the second limiter output being between the second upper limit value and the second lower limit value; and
a second flip-flop, for receiving the second limiter output and outputting the second brightness value when triggered by the enable signal;
wherein the fist brightness value and the second brightness value are for adjusting the panel brightness. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification