With the rapid development of information and electronics, the application of touch sensitive display panels has become increasingly common. Currently, touch sensitive panels have started to become an industry worldwide. As an advanced computer input device, it is currently the simplest, most convenient, natural, and suitable for multimedia information query equipment. Touch panels have many advantages such as durability, fast response speed, space saving, and easy communication.
However, in response to the popularization of VCD/DVD multimedia and satellite navigation GPS in cars, touch sensitive display panels are becoming increasingly common, allowing drivers or passengers to use this technology. They only need to lightly touch the icons or text on the display panel with their fingers to operate the host, thereby enabling interaction between people, cars, and machines to output and input into the system. This technology greatly facilitates users who do not understand computer operations and gives car multimedia devices a new look, making it a highly attractive new multimedia interaction product. This article introduces the relevant technologies and application solutions of small-sized touch sensitive display panels for reference.
For the convenience of operation, people use touch panels instead of mice or keyboards. When working, we must first touch the touch panel installed at the front end of the display with our fingers or other objects, and then locate and select information input based on the icon or menu position touched by our fingers. Its main architecture consists of a touch detection component and a touch panel controller.
The touch detection component is installed in front of the display panel to detect the user's touch position, and after receiving it, it is sent to the touch screen controller; The main function of the touch screen controller is to receive touch information from the touch point detection device, convert it into touch point coordinates, and then send it to the CPU. It can also receive commands from the CPU and execute them.
At present, touch panels in the market can be mainly divided into five basic types; From the perspective of technical principles, touch panels can be divided into pressure sensing technology touch panels, resistive technology touch panels, capacitive technology touch panels, infrared technology touch panels, and surface acoustic wave technology touch panels.
Among them, pressure sensing technology has exited the market; Although infrared technology is inexpensive, the outer frame is prone to damage, causing light interference and distortion when curved; The theory of capacitive design is good, but it is difficult to fundamentally solve the problem of image distortion; Resistive positioning is accurate, but the price is high and the panel is also prone to damage; Surface acoustic wave touch screens have solved various defects of previous touch screens, with clearer images and anti explosion effects, suitable for various occasions. However, the main disadvantage is that once there are water droplets or dust on the panel, the response will become sluggish or even not work.