Touch screen liquid crystal display module and touch drive method thereof
A liquid crystal display module and liquid crystal display technology, applied in the direction of static indicators, etc., can solve the problems of unfavorable liquid crystal panel thinning trend, increase the thickness of the module, increase the production cost, etc., to save the shielding layer, simplify the structure, and reduce the impact Effect
Active Publication Date: 2012-10-17
SHANGHAI TIANMA MICRO ELECTRONICS CO LTD
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Problems solved by technology
[0007] Although the shielding layer 7 can effectively shield the influence of the electrical noise of the liquid crystal display screen 102 on the touch screen 101, adding this layer of indium tin oxide layer (ITO) increases the difficulty of process manufacturing on the one hand and increases the production cost. It is also necessary to add another layer of glass substrate 8, which greatly increases the thickness of the entire module, which is not conducive to the thinning trend of the liquid crystal panel
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[0028] In the prior art, the touch screen and the liquid crystal display are not only separated in structure, but also work independently of each other. While the touch screen senses the user's touch signal, the LCD screen at the bottom is also imaging and displaying frame by frame. Therefore, a shielding layer needs to be added between the touch screen and the LCD screen to eliminate the noise interference from the LCD screen to the touch screen.
[0029] The scanning frequency of a standard liquid crystal display is 60Hz, that is, each frame time is about 16.7 milliseconds; however, for most thin-film transistors of liquid crystal display arrays, the gate pulse width is relatively small, and the time to complete one frame of progressive imaging may be less than Standard time for each frame. Taking the 240×320 pixel QVGA liquid crystal display as an example, the widest pulse that the gate of the thin film transistor can respond to only needs 52 microseconds. figure 2 In the...
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The invention relates to a touch screen liquid crystal display module and a touch drive method thereof. According to a working mode of the touch screen liquid crystal display module, a public electrode layer is subjected to time sharing multiplexing. The touch drive method comprises the steps of: dividing each frame into a display mode and a touch mode; when in the display mode, providing a display signal for the public electrode layer; and when in the touch mode, providing a touch signal for the public electrode layer. Compared with the prior art, the invention not only reduces the influenceof the electric noise of a liquid crystal display array to a touch working layer, but also omits a shielding layer, and further decreases the thickness of a panel of the touch screen liquid crystal display module by forming an integration structure.
Description
technical field [0001] The invention relates to a liquid crystal display device, in particular to a touch screen liquid crystal display module and a touch driving method thereof. Background technique [0002] In recent years, the rapid development of the information and communication field has increased the demand for various types of display devices. As a typical display and output device, the liquid crystal display has gradually expanded its input function, and more and more people use the liquid crystal display with the touch input function. The touch screen (Touch Panel) technology provides a more intuitive user interface, has many advantages such as ruggedness, fast response, space saving, and convenient human-computer interaction, and has been widely welcomed. [0003] Existing touch screen liquid crystal display modules are mainly used in combination with touch screens and liquid crystal display screens, wherein the liquid crystal display screens mostly use active ma...
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IPC IPC(8): G02F1/133
Inventor 陈悦邱承彬吴显浩
Owner SHANGHAI TIANMA MICRO ELECTRONICS CO LTD