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发明授权
CN105448248B 功率调节电路及液晶显示装置 有权

功率调节电路及液晶显示装置
摘要：
本发明提供一种功率调节电路及液晶显示装置。发光单元加载第一供电电压以发光，功率调节电路包括亮度感测单元、功耗检测单元、控制芯片及电压调节单元，亮度感测单元感测发光单元发光时的亮度，功耗检测单元检测发光单元发光时功耗为第一功耗，控制芯片将第一功耗与发光单元当前亮度下的最小功耗进行比较，当第一功耗与最小功耗的差值大于预设阈值时，控制芯片控制电压调节单元降低第一供电电压的幅值且增大第一供电电压的占空比以使得发光单元保持亮度不变且发光单元的第二功耗与最小功耗的差值小于或等于预设阈值，其中，第一供电电压的幅值及占空比被调整后且发光单元亮度不变的情况下发光单元的功耗为第二功耗。本发明发光单元功耗较低。
摘要（英）：

The present invention provides a power regulating circuit and a liquid crystal display device. The light emitting unit is applied with a first supply voltage for emitting light, and the power regulating circuit comprises a brightness sensing unit, a power consumption detecting unit, a control chip and a voltage regulating unit, and the brightness sensing unit senses a brightness, and the power consumption detecting unit detects a power consumption, which is a first power consumption, and the control chip compares the first power consumption with a minimum power consumption of a current brightness of the light emitting unit, and as a difference of the first power consumption and the minimum power consumption is larger than a preset threshold value, the control chip controls the voltage regulating unit to decrease an amplitude of the first supply voltage and to increase a duty ratio of the first supply voltage.

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