Display device and common voltage circuit module thereof

Abstract

The invention provides a display device and a common voltage circuit module of the display device. The common voltage circuit module comprises a power source end, a grounding end, a common voltage end, a first resistor element, a second resistor element and a variable resistor element, wherein the first resistor element is coupled with the common voltage end and the grounding end, the second resistor element is coupled with the power source end and the common voltage end and form a first current transmission path sequentially from the power source end, the second resistor element and the first resistor to the grounding end, and a first end and a second end of the variable resistor element are coupled with the power source end and the grounding end respectively to form a second current transmission path. A partial voltage end of the variable resistor element is coupled with the common voltage end to selectively adjust the resistance value between the power source end to the partial voltage end and the resistance value between the partial voltage end and the grounding end in the second current transmission path.

Description

technical field [0001] The present invention relates to a shared voltage circuit module, and in particular to a shared voltage circuit module used for a display device. Background technique [0002] In recent years, with the rapid development of optoelectronic technology and semiconductor technology, the popularization and use of flat panel display devices has been promoted. Among many flat panel display devices, liquid crystal displays have become the mainstream in the market because of their superior characteristics such as high space utilization, low power consumption, zero radiation, and low electromagnetic interference. [0003] Before the liquid crystal display is shipped, inspectors need to adjust the variable resistance value of the common voltage circuit module coupled to the display module in the liquid crystal display to ensure the voltage level (voltage level) output by the common voltage circuit module It can be within a range of voltage levels that can work no...

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Problems solved by technology

[0007] However, in the process of transportation or detection, if a collision or human factors cause the variable resistance element 93 to fall off or its control terminal 93c breaks, the voltage output by the common voltage terminal VCOM of the known common voltage circuit module 9 will The level is equal to the voltage level that the power supply terminal GMA can provide

[0008] In this way, the voltage level received by the display module from the common voltage terminal VCOM is equal to the voltage level provided by the power supply terminal GMA. In addition to causing strong flickering of the display screen, it may also cause damage to the display module.

In addition, the voltage of the power supply terminal GMA will jointly affect the Gamma voltage of the liquid crystal display, resulting in instability of the liquid crystal display and large power consumption

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