Gamma voltage drive circuit, source drive module and liquid crystal display panel

Abstract

The invention discloses a Gamma voltage drive circuit. The circuit comprises a reference voltage module, a dividing resistor string and a voltage selection module. The reference voltage module is used to provide a reference voltage to the dividing resistor string. The dividing resistor string comprises 2n resistors which are serially connected successively for dividing the reference voltage into 2n voltages, wherein n is an integral number which is not less than 1. The voltage selection module is used to select and output one of the 2n voltages. The reference voltage module comprises first and second reference voltages. The first reference voltage is coupled to one end of the dividing resistor string. The second reference voltage is coupled between the (2<n> / 2)th resistor and the (2<n> / 2+1)th resistor of the dividing resistor string. The voltage selection module comprises 2<n>-1 transmission lines for connecting dividing nodes of 1-2<n> / 2-1 resistors and 2<n> / 2+1-2<n> resistors in the dividing resistor string to the output end respectively, and each transmission line is provided with n-1 switching elements. The drive circuit provided in the invention can be used to reduce the number of used elements, reduce the design and fabrication technique difficulty of the drive IC, and reduce the manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of liquid crystal displays, in particular to a Gamma voltage drive circuit in a liquid crystal display, a source drive module and a liquid crystal panel including the source drive module. Background technique [0002] Liquid Crystal Display (LCD) is a flat and ultra-thin display device, which consists of a certain number of color or black and white pixels, placed in front of the light source or reflective surface. Liquid crystal displays have low power consumption, high image quality, small size, and light weight, so they are favored by everyone and become the mainstream of displays. At present, the liquid crystal display is mainly a thin film transistor (Thin Film Transistor, TFT) liquid crystal display, and the liquid crystal panel is a main component of the liquid crystal display. [0003] like figure 1 A conventional liquid crystal panel is shown, which includes an upper glass substrate 1 , a lower gla...

AI Technical Summary

Problems solved by technology

A large number of MOS transistors increase the difficulty of the design and manufacturing process of the driver IC, increasing the cost

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