With the large-scale use of capacitive touch screens on mobile phones, people feel the excellent touch experience brought by capacitive touch screens. At the same time, the man-machine interface using capacitive touch screens also has the advantages of stylish appearance and easy cleaning. , Some difficult problems of using capacitive touch screens in the industrial field have also been gradually solved.
Big size problem
Due to the antenna effect, the larger the size of the capacitive touch screen, the more difficult it is to improve anti-interference and sensitivity, and it is easy to cause false touch operations due to the capacitive touch screen itself. In the industrial LCD products, the integrated touch panel and advanced technology are adopted to successfully overcome this problem. At present, industrial-grade products can realize the stable operation of industrial-grade capacitive touch screens up to 18.5 inches. 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:
- Solve the problem of sensitive air gap between the capacitive touch screen and the spacer, which will greatly reduce the requirements for placement, and the production is simple and easy;
- Adapt to the application environment with gloves or dirty hands;
- When it is set to the highest sensitivity, there will be no touch screen malfunction due to high sensitivity.
Thick protective cover problem
In order to protect the touch screen or LCD screen from external forces and unclean environments, thick glass or plastic protective covers are often placed on the operation panels used in the industrial field. A tempered glass panel with a thickness of up to 9mm and an acrylic panel with a thickness of 6mm can be installed in front of the capacitive touch screen. In the test, the 18.5-inch capacitive touch screen 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:
- When 1-3 pieces of 1.6mm thick tempered glass are superimposed, the touch screen function is normal.
- Touch the paper magazine with a thickness of 8mm, and the touch screen functions normally.
Glove problem
Industrial environments often require the wearing of gloves for machine operations. While this isn’t a big deal for mechanical buttons, it can have a huge impact on capacitive touch solutions. The capacitive touch screen can work normally even when wearing plush gloves in winter, and the touch screen can be operated normally with 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.
Outdoor use problem
Considering that many industrial application environments are outdoors, there will be interference from strong light and ultraviolet rays. In the past, if the capacitive touch screen was used outdoors for a long time, it would age, causing the capacitive touch screen to no longer work normally. On the capacitive touch screen, the functions of CG anti-glare and UV protection are adopted. CG anti-glare means that under strong light, the touch screen can diffusely reflect the light source, thereby reducing the intensity of light reflected directly into the human eye through the touch screen. UV protection is the ultraviolet protection function. 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 device.
Mechanical stability issues
Industrial-grade capacitive touch screens 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 single-layer tempered glass + organic coating. Therefore, industrial-grade capacitive touch screens are also very reliable in terms of mechanical stability.