Liquid crystal display and control method thereof

Abstract

The invention discloses a liquid crystal display. The liquid crystal display comprises a liquid-crystal display panel, a touch screen, a touch screen circuit chip and a power supplying module, wherein the touch screen circuit chip is connected with the touch screen and is used for detecting whether the touch screen is touched or not and outputting control signals; the power supplying module is separately connected with the touch screen circuit chip and the liquid-crystal display panel and is used for supplying direct-current signals or alternate-current signals to the liquid-crystal display panel according to the control signals. According to the liquid crystal display with the touch screen and the control method thereof, provided by the invention, the alternate-current signals are supplied to a color filter side of the liquid-crystal display panel when the touch screen is not touched so as to improve the phenomenon of image stacking, the direct-current signals are supplied to the color filter side of the liquid-crystal display panel when the touch screen is touched so as to avoid a mistaken touching phenomenon when the touch screen is used, and thus the accuracy and precision of touch are improved.

Description

technical field [0001] The invention belongs to the field of display technology, and more specifically relates to a liquid crystal display device and a control method thereof. Background technique [0002] The liquid crystal display device utilizes the property that liquid crystal molecules have different polarization or refraction effects on light in different alignment states to control the amount of light transmitted, thereby enabling the liquid crystal display device to generate images. [0003] Generally, the traditionally used Twisted Nematic (TN) liquid crystal display device is affected by the liquid crystal molecular structure and optical properties, so the viewing angle is very narrow. Therefore, other types of liquid crystal display devices with wide viewing angles have been developed, such as vertical alignment (Vertical Alignment, VA) liquid crystal display devices, in-plane switching (In-PlanSwitch, IPS) liquid crystal displays, and fringe field switching (Frin...

AI Technical Summary

Problems solved by technology

Generally speaking, although positive liquid crystal molecules have the advantage of fast response time, their light transmittance is low.

On the contrary, negative liquid crystal molecules have the disadvantage of high light transmittance, but longer reaction time

Therefore, in IPS and FFS liquid crystal display devices, when negative liquid crystal molecules are used to form the liquid crystal layer, liquid crystal molecules with smaller molecular weights are usually added to increase the sliding properties between negative liquid crystal molecules to improve the above reaction time. longer disadvantages

However, when the liquid crystal composition forming the liquid crystal layer is heated or irradiated by external ambient light, these small molecular liquid crystals are easily dissociated to generate electrons or radicals, and the generated electrons will be lost from the alignment layer, making the liquid crystal The voltage holding ratio (VoltageHoldingRatio, VHR) of the display device decreases, resulting in abnormal alignment, which in turn affects the image stacking (ImageStacking) and optical performance of the liquid crystal display device

[0005] The existing solution to improve ImageStacking is to add an AC signal ACVCOM on the color filter substrate side of the LCD panel, but then the panel noise will also become much larger. For LCD devices with touch screens , because the increase of PanelNoise will affect the accuracy and precision of touch, so the liquid crystal display device can not take into account the use of IS and Touch touch screen at the same time, affecting the actual value of the product

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