Light-merging control units
AssigneeAu Optronics Corporation
InventorsKo-Chia Kao, Chih-Kuang Chen, Jyh-Haur Huang
Life of this patent
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Abstract
A light-merging control unit applied in a backlight module. The backlight module comprises first and second light emitting units respectively driven by first and second frequencies. Light from the first and second light emitting units is merged into merged light. The light detector detects the merged light and generates a detection signal. The controller calculates the power of the first and second frequencies according to the detection signal. The controller controls the first driver to adjust the power of the first frequency and the second driver to adjust the power of the second frequency.
Claims11
A light-merging control unit for a backlight module of a display device, the backlight module comprising a first light emitting unit driven by a first frequency and a second light emitting driven by a second frequency, with light from the first and second light emitting units merged into merged light, the light-merging control unit comprising:
- a light detector detecting the merged light and generating a detection signal;
- a controller calculating the power of the first and second frequencies according to the detection signal, generating a first control signal according to the difference between the power of the first frequency and a first predetermined frequency power, and generating a second control signal according to the difference between the power of the second frequency and a second predetermined frequency power;
- a first driver adjusting the power of the first frequency according to the first control signal;
- and
- a second driver adjusting the power of the second frequency according to the second control signal.
A light-merging control unit for a backlight module of a display device, the backlight module comprising a red emitting unit driven by a first frequency, a green emitting unit driven by a second frequency, and a blue light emitting driven by a third frequency, light from the red, green, and blue light emitting units merged into white light, the light-merging control unit comprising:
- a light detector sensing the white light and generating a detection signal;
- a controller determining chromaticity coordinates of the white light according to the detection signal and outputting first, second, third control signals according to the difference between the chromaticity coordinates of the white light and predetermined chromaticity coordinates;
- a first driver adjusting the power of the first frequency according to the first control signal, thereby adjusting the intensity of the light from the red emitting unit;
- a second driver adjusting the power of the second frequency according to the second control signal, thereby adjusting the intensity of the light from the green emitting unit;
- and
- a third driver adjusting the power of the third frequency according to the third control signal, thereby adjusting the intensity of the light from the blue emitting unit.
Dependencies are inferred from the claim text.