Gray scale voltage generating circuit and method, source driver IC and liquid crystal display (LCD) device

Abstract

The invention provides a gray scale voltage generating circuit and a method, a source driver IC and an LCD device, belongs to the LCD technical field, and can solve the problems of gray scale losses or increased cost and circuit design difficulty caused when a backlight unit with dynamic changes in brightness is used in the existing LCD technique. The gray scale voltage generating circuit comprises a voltage-dividing circuit, a plurality of output branches, a plurality of accessing ends and a control unit, wherein the voltage-dividing circuit is used for dividing a plurality of gamma reference voltages so as to generate a plurality of gray scale voltages; the output branches are connected with different positions of the voltage-dividing circuit and are used for outputting the gray scale voltages; the accessing ends are connected with the voltage-dividing circuit and are used for connecting the gamma reference voltages, and at least one accessing end is connected to a plurality of positions of the voltage-dividing circuit through a plurality of accessing branches which are provided with switches; and the control unit is used for controlling the switches. The gray scale voltage generating circuit can be applied to the LCD device of the backlight unit with dynamic changes in brightness.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display, and in particular relates to a grayscale voltage generation circuit and method, a source driver chip, and a liquid crystal display device. Background technique [0002] With the development of technology, liquid crystal display devices are more and more widely used. like figure 1 As shown, the liquid crystal display device includes a timing controller, a gamma reference voltage unit, a source driver chip, a gate driver chip, a backlight unit, a display panel unit and the like. like figure 2 As shown, the gamma reference voltage unit generates multiple gamma reference voltages V 1 ~V m , the source driver chip includes multiple series-connected divider resistors R 1 ~R q Composed of a voltage divider circuit, each gamma reference voltage V 1 ~V m Connect to different positions of the voltage divider circuit respectively, the adjacent gamma reference voltage V 1 ~~V m thro...

AI Technical Summary

Problems solved by technology

[0006] The technical problems to be solved by the present invention include, when using a backlight unit with dynamically changing brightness in the existing liquid crystal display technology, it may cause loss of gray scale, reduce picture quality, or must use P-gamma circuit, cost and circuit design To solve the problem of increased difficulty, provide a liquid crystal display technology that can avoid the loss of gray scale, and has low cost and circuit design difficulty

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