nfrared technology touch screens are composed of infrared emitting and receiving sensing elements installed on the outer frame of the touch screen. On the surface of the screen, an infrared detection network is formed. Any touching object can change the infrared on the contact point to realize touch screen operation. The implementation principle of infrared touch screen is similar to that of surface acoustic wave touch. It uses infrared emitting and receiving sensing elements. These elements form an infrared detection network on the surface of the screen. The object of the touch operation (such as a finger) can change the infrared of the contact point, which is then converted into the coordinate position of the touch to realize the response of the operation. On the infrared touch screen, the circuit board devices arranged on the four sides of the screen have infrared emitting tubes and infrared receiving tubes, which form a horizontal and vertical cross infrared matrix.
Infrared touch screen is an infrared matrix densely distributed in the X and Y directions in front of the screen. It detects and locates the user's touch by constantly scanning whether the infrared rays are blocked by objects. As shown in the figure "Working Principle of Infrared Touch Screen", this touch screen is installed with an outer frame in front of the display. The outer frame is designed with a circuit board, so that infrared transmitting tubes and infrared receiving tubes are arranged on the four sides of the screen, one by one corresponding to form a horizontal and vertical cross infrared matrix. After each scan, if all infrared pairs of tubes are connected, the green light is on, indicating that everything is normal.
When there is a touch, the finger or other object will block the horizontal and vertical infrared rays passing through the position. When the touch screen scans and finds and confirms that one infrared ray is blocked, the red light will be on, indicating that the infrared ray is blocked and there may be a touch. At the same time, it will immediately switch to another coordinate and scan again. If it is found that another axis also has an infrared ray blocked, the yellow light will be on, indicating that a touch is found, and the positions of the two infrared tubes found to be blocked will be reported to the host. After calculation, the position of the touch point on the screen is determined.
Infrared touch screen products are divided into two types: external and internal. The installation method of the external type is very simple and is the most convenient among all touch screens. Just use glue or double-sided tape to fix the frame in front of the display. The external touch screen can also be fixed to the display by a hook, which is convenient for disassembly without leaving any traces.
Technical features of infrared touch screen:
1. High stability, no drift due to changes in time and environment
2. High adaptability, not affected by current, voltage and static electricity, suitable for some harsh environmental conditions (explosion-proof, dust-proof)
3. High light transmittance without intermediate medium, up to 100%
4. Long service life, high durability, not afraid of scratches, long touch life
5. Good use characteristics, no need for force to touch, no special requirements for touch body
6. Supports simulated 2 points under XP, supports true 2 points under WIN7,
7. Supports USB and serial port output,
8. Resolution is 4096 (W) * 4096 (D)
9. Good operating system compatibility Win2000/XP/98ME/NT/VISTA/X86/LINUX/Win7
10. Touch diameter ＞= 5mm
From the application level, the touch screen should not be just a simple device that converts the touch position into coordinate information, but should be designed as a complete human-machine interface system. The fifth-generation infrared touch screen is based on such standards, and it realizes the improvement of product concepts through built-in processors and perfect driver software.
Therefore, the new infrared touch technology will have a very significant impact on the domestic and foreign markets.
Post time: Aug-28-2024