How to choose capacitive touch screen for TFT Lcd Module

In today's rapidly developing information age,LCD screensare widely used in various fields, with TFT LCD touchscreens with touch function being particularly prominent. Whether in the commercial, home appliance, medical or industrial fields, the use of touchscreens can be seen. Touchscreens are separate from the traditional control mode of buttons and can be directly clicked and slid on the screen, making human-machine interaction more direct and convenient.

There are many types and specifications ofTFT LCD touchscreens, so how can we select the one suitable for our project? Chenghao Display offers the following dimensions for users to learn how to choose the right TFT LCD capacitive touchscreen.

1.Touch type of the LCD touchscreen

From the perspective of touch type, TFT LCD touchscreens are divided into resistive touchscreens and capacitive touchscreens. The principle of resistive touchscreens is to perform control through pressure sensing, causing the layers of the screen to make contact. There are many ways to touch, including fingers and touch pens. Capacitive touchscreens work by using the body's electric current induction and support only finger operations. Each type of touchscreen has its own advantages: resistive touchscreens have a high surface hardness and durability, and simple manufacturing technology plus lower costs, making them more suitable for smaller products that do not require high touch capabilities. Capacitive touchscreens have high touch accuracy, fast response, and support multi-touch, but their manufacturing costs are higher, making them more suitable for demanding industrial and outdoor environments, as well as electronic products with high touch accuracy requirements.

2.Touch accuracy of the LCD touchscreen

TFT LCD touchscreens can sometimes be affected by surrounding electromagnetic interference, so reliable touch accuracy capabilities need to be provided for the display device. This ensures that users can click on the corresponding interface according to their intentions without mis-tapping or operational errors. Compared with resistive touchscreens, capacitive touchscreens are products with higher touch accuracy. When users touch it, the fingertips and the work surface form a coupling capacitance due to the human body's electric field. Since the work surface is connected to a high-frequency signal, the fingertips absorb a small current, which flows out from the electrodes on the four corners of the screen. The controller precisely calculates the ratios of the four currents to obtain the position. Therefore, capacitive touchscreens can achieve 99% accuracy.

3.Touch resolution of the LCD touchscreen

The resolution of TFT LCD touchscreens refers to the number of touch points and parallel touch points of the TFT touchscreen. The higher the resolution of the touchscreen, the more touch points and better pointing accuracy it can provide, thereby achieving more accurate clicking and better user experience. Generally speaking, the higher resolutionTFT touchscreens include 800480, 1024600, 1280*800, among others.

4.Response time of the LCD touchscreen

The touch response time of TFT LCD touchscreens refers to the time from when the user touches the screen panel until the screen responds to the corresponding operation. The shorter the touch response time, the better the user experience. Experimental studies have shown that touch response less than 10 milliseconds makes people feel comfortable. Capacitive touchscreens perform well with a response time of about 3 milliseconds, while resistive touchscreens are somewhat lower at around 10 milliseconds.

5.Working environment of the LCD touchscreen

The working environment of TFT LCD touchscreens is divided into indoor and outdoor environments. Indoor environments are relatively favorable, so the specifications of the touchscreen are not as high. If the working environment of the touchscreen is a harsh outdoor environment, many environmental factors affecting the screen need to be considered, such as dust resistance, high temperatures and humidity. Usually, corresponding LCD touchscreens are customized according to the environment. For example, if the touchscreen works in a high-temperature and sunny environment, it needs outdoor high-brightness and super-wide working temperature features. In a dusty work environment, dust-proof features and improved glass panels are necessary.

Through the above introduction, everyone should have a preliminary understanding of the selection of TFT LCD touchscreens. Customizing a suitable LCD touchscreen for your product based on cost and actual needs is the most correct display solution.