Color calibration circuit and method applied to backlight source in liquid crystal display module
AssigneePowerview Display Corporation
InventorCheng-Pang Chien
Life of this patent
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Abstract
A color calibration circuit and a calibration method for a backlight source of a liquid crystal display module are provided. The backlight source is an RGB backlight source. When the calibration method is performed, the controller receives three color light intensity signals from a light sensor, and three updated driving currents are calculated. Then, the controller provides the driving currents to the backlight source. Consequently, the red light beam, the green light beam, and the blue light beam emitted by the backlight source are mixed as a white light beam, and the white light beam is not subjected to color variation.
Claims11
A color calibration circuit for a liquid crystal display module, the color calibration circuit comprising:
- a backlight source comprising plural first color light-emitting diodes for emitting a first monochromatic light beam, plural second color light-emitting diodes for emitting a second monochromatic light beam, and plural third color light-emitting diodes for emitting a third monochromatic light beam, wherein the plural first color light-emitting diodes, the plural second color light-emitting diodes and the plural third color light-emitting diodes are arranged in an array structure;
- a light sensor located beside the backlight source;
- and
- a controller electrically connected to the backlight source and the light sensor,
- wherein when the controller performs a calibration method, the controller receives a first color light intensity signal representing a first color light intensity of the first monochromatic light beam, a second color light intensity signal representing a second color light intensity of the second monochromatic light beam, and a third color light intensity signal representing a third color light intensity of the third monochromatic light beam, and the controller calculates a first updated driving current according to the first color light intensity signal, calculates a second updated driving current according to the second color light intensity signal, and calculates a third updated driving current according to the third color light intensity signal,
- wherein the controller provides the first updated driving current to the plural first color light-emitting diodes, provides the second updated driving current to the plural second color light-emitting diodes, and provides the third updated driving current to the plural third color light-emitting diodes, wherein
- the first monochromatic light beam, the second monochromatic light beam, and the third monochromatic light beam are mixed as a white light beam not subjected to color variation when the plural first color light-emitting diodes arranged in the array structure are driven by the first updated driving current, the plural second color light-emitting diodes arranged in the array structure are driven by the second updated driving current, and the plural third color light-emitting diodes ranged in the array structure are driven by the third updated driving current.
Dependencies are inferred from the claim text.