With the large-scale use of capacitive touch screens on mobile phones, people have felt the excellent touch experience brought by capacitive touch screens. At the same time, the man-machine interface using the capacitive touch screen also has the advantages of stylish appearance and easy cleaning. With the advancement of technology, some of the problems of using capacitive touch screens in the industrial field have also been gradually solved.
1. Large size problem
Due to the antenna effect, the larger the size of the capacitive touch screen, the more difficult it is to improve the anti-interference and sensitivity, and it is easy for the capacitive touch screen itself to cause accidental touch operations. In industrial-grade LCD products, an integrated touch panel method and advanced technology are used to successfully overcome this problem. At present, industrial-grade products can achieve stable working of industrial-grade capacitive touch screens up to 18.5-inch. The integrated panel refers to the integration of the capacitive touch screen and the front tempered glass panel through a special process. In this way, the following problems can be solved:
A. Solving the sensitive problem of the air gap between the capacitive touch screen and the spacer will greatly reduce the mounting requirements, and the production is simple and easy;
B. Adapt to the application environment with gloves or dirty hands;
C. When set to the highest sensitivity, the touch screen will not malfunction due to high sensitivity.
2. The problem of thick protective cover
In order to protect the touch screen or LCD screen from external forces and unclean environment, the operation panel used in the industrial field often puts a thick glass or plastic protective cover. The capacitive touch screen can be equipped with a tempered glass panel with a thickness of up to 9mm and an acrylic panel with a thickness of 6mm. In the test, the 18.5-inch capacitive touch screen used is a capacitive touch screen with 3mm thick tempered glass. When using an ordinary switching power supply, set the highest sensitivity to achieve the following operations:
A. Superimposed operation of 1-3 sheets of 1.6mm thick tempered glass, and the touch screen functions normally.
B. Touch every 8mm thick paper magazine, and the touch screen functions normally.
3. Glove problem
Industrial environments often require gloves to be used for machine operations. Although this is not a big problem for mechanical buttons, it will have a huge impact on capacitive touch solutions. The capacitive touch screen can work normally even when wearing winter plush gloves, and the touch screen can be operated normally using rubber gloves, plastic gloves, and cotton gloves commonly used in the industry. And a small amount of water or other dirt on the gloves will not affect the normal operation of the capacitive touch screen.
Four. Outdoor use problems
Taking into account that many industrial application environments are outdoors, there will be strong light, ultraviolet rays and other interference. In the past, if the capacitive touch screen is used outdoors for a long time, it will age, and the capacitive touch screen can no longer be used normally. On the capacitive touch screen, CG anti-glare and UV protection functions are used. CG anti-glare means that under strong light, the touch screen can diffusely reflect the light source, thereby reducing the intensity of light directly reflected by the touch screen into the human eye. UV protection is the function of ultraviolet protection. Through a special coating, ultraviolet rays cannot pass through the glass on the capacitive touch screen, thereby greatly reducing the impact of ultraviolet rays on the equipment.
5. Mechanical stability issues
Industrial-grade capacitive touch screens all use G+G technology. G+G refers to Glass+Glass, which means that the capacitive touch screen is composed of double-layer tempered glass instead of a single-layer tempered glass + organic coating. Therefore, the industrial-grade capacitive touch screen is also very reliable in terms of mechanical stability.
