Gamma voltage drive circuit, source drive module and liquid crystal panel
A voltage-driven and source-driven technology, applied to instruments, static indicators, etc., can solve the problems of increasing the difficulty of driver IC design and manufacturing process, increasing costs, etc., to reduce the difficulty of design and manufacturing process, and reduce the number of uses , The effect of saving manufacturing cost
Active Publication Date: 2016-03-30
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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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
Method used
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[0030] As mentioned above, in order to solve the problems existing in the prior art, the present invention provides a Gamma voltage driving circuit, which includes: a reference voltage module, which provides a reference voltage to the voltage dividing resistor string; of 2 n resistors to divide the reference voltage into 2 n Gamma voltages; wherein, n is an integer not less than 1; the voltage selection module is used to select and output the 2 n One of the Gamma voltages;
[0031] Wherein, the reference voltage module includes a first reference voltage and a second reference voltage, the first reference voltage is coupled to one end of the voltage-dividing resistor string, and the other end of the voltage-dividing resistor string is connected to ground; The second reference voltage is coupled to the first voltage dividing resistor string with the first Between resistors, wherein the voltage value of the second reference voltage is equal to that of the first reference vo...
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A gamma voltage drive circuit. The circuit comprises: a reference voltage module for providing a reference voltage to a voltage dividing resistor string; the voltage dividing resistor string comprising 2n resistors which are serially connected successively for dividing the reference voltage into 2n voltages, where n is an integral number which is not less than 1; and a voltage selection module for selecting and outputting 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 (2n / 2)th resistor and the (2n / 2+1)th resistor of the dividing resistor string. The voltage selection module comprises 2n-1 transmission lines for connecting voltage dividing nodes of 1~(2n / 2-1) resistors and (2n / 2+1)~2n resistors in the voltage dividing resistor string to the output respectively, and each transmission line is provided with (n-1) switching elements. The drive circuit can reduce the number of used elements, lower the design and fabrication technique difficulty of the drive IC, and save manufacturing costs.
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, liquid crystal displays are mainly thin film transistor (ThinFilm Transistor, TFT) liquid crystal displays, and liquid crystal panels are the main components of liquid crystal displays. [0003] Such as figure 1 A conventional liquid crystal panel is shown, which includes an upper glass substrate 1 , a lower glass ...
Claims
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IPC IPC(8): G09G3/36
CPCG09G3/3696G09G2320/0276
Inventor 张华杨雪亮
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD