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What Is An In-cell Touch Screen?


2021-09-11


Today,let us talk about what is an in-cell touch screen.In-Cell means that the Sensor is in Celll. It is under the liquid crystal and on the same glass substrate as the TFT. Touch technology has three categories according to the sensor location. In-Cell, On-Cell and Out Of Cell (plug-in). Cell is the part sandwiched between two glass substrates.

In-cell Touch Screen

In-cell refers to the method of embedding touch panel functions into liquid crystal pixels. Compared with the original method of using the touch panel on the liquid crystal panel. Research on the integration of touch panel functions with LCD panels is becoming increasingly popular. The innovation of the In-Cell touch panel is to load a circuit on the LCD screen. The LCD screen has the ability of sensing touch input of the traditional touch panel. The In-cell touch panel is not only more accurate. But also eliminates the need for a touch panel. Thus making the entire touch screen lighter and thinner. Traditional touch screens are difficult to display clearly in the sun. Now that there is no touch pad, there is no parallax, and the readability is also improved.

Advantages Of In-Cell Touch Screen

Compared with the original method of using the touch panel on the liquid crystal panel. Research on the integration of touch panel functions with LCD panels is becoming increasingly popular. The integration of the touch panel and the liquid crystal panel includes the “In-cell” method and the “On-cell” method.

In-cell refers to the method of embedding touch panel functions into liquid crystal pixels. If the original external touch panel components can be integrated with the LCD panel. It is possible to achieve thinner and lighter panels. In addition, in the original method of placing the touch panel outside of the liquid crystal. There is a physical space between the LCD and the touch panel. Therefore, external light. Or the like is reflected between the upper surface of the liquid crystal panel. And the lower surface of the touch panel. This leads to reduced visibility in bright environments such as outdoors. If the external touch panel components can be integrated. It is possible to suppress the decrease in visibility outdoors, etc. These are advantages of In-cell touch screen.

Disadvantages

Proposals for In-cell technology have been put forward before. But it is difficult to ensure the yield and display performance. So practical progress has not been made. The reason is that the touch sensor function needs to be embedded inside the pixels on the TFT array substrate. For this reason, a complicated semiconductor manufacturing process must be used. This becomes a stumbling block to improve yield. In addition, a touch sensor is embedded in the pixel. The area available for display will be reduced. This is the main reason for the deterioration of picture quality. So these are the disadvantages of in-cell touch screen.

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