Optical touch screen principle introduction
Apr 27, 2018
Optical touch technology is a new technology that is different from existing touch technologies such as infrared, surface acoustic wave, resistance, and capacitance. The optical sensor responds quickly to detailed movements, realizing multi-touch and multiple gestures and motion recognition. Naturally zooming, rotating, and commenting make the touch smoother and smoother, bringing the touch experience to a whole new level, fully embodying the unique charm of human-computer interaction.
First, CCD optical touch screen overview:
Optical touch technology makes your application lighter, smoother and more accurate! The creative multi-touch technology application is even more perfect for optical touch technology! Simple, accurate and quick response. The CCD optical touch technology breaks the bottleneck of the original touch technology and greatly improves the accuracy, reaction speed, and life. You can also enjoy the pleasure of controlling the movement of three-dimensional objects and the zero-distance contact with the virtual animals in the screen by gently touching the screen.
Second, CCD optical touch screen Introduction:
The optical touch screen uses optical image touch technology and is perfectly integrated with Windows 7. The optical touch screen is mainly installed in the top left corner of the CCD camera to send and receive signals. Light is emitted through the LED lamp, reflected by the surrounding reflectors, and entered into the CCD camera in the upper right corner. Similarly, the light emitted by the CCD camera in the upper right corner is transmitted to the left CCD camera. The dense light forms a light net in the touch area, and the space between multiple reflected lights is within 1 mm. When touching a point, the emitted light and the received light of this point form an included angle. At the same time, the CCD camera at both ends and the lines formed between the two lights and the two cameras form two included angles, so that the accuracy of the point is correct. The coordinates are entered by the controller to achieve a touch response.
The two CCD cameras installed at the top left and right corners can accurately detect the position of your finger so that you can not only click, drag, but also freely rotate and enlarge the picture. These operations depend on the number of your fingers and the unit area.
Third, CCD optical touch screen main technical features:
Multi-touch interactive large-screen implementation forms are various. The interactive large-screen system uses advanced computer vision technology to acquire and recognize the position of the finger on the screen, and converts the physical coordinates of the finger on the screen to the logic of the computer screen through a specific algorithm. Coordinates and control commands, control functions such as touching and labeling of a finger or finger on a large screen. Achieve natural human-computer interaction and get rid of the restrictions on touchscreens. You can also achieve interactive touch effects through interactive screen sources, such as large-screen touch boxes. Through gestures and touch, you can freely play 3D models, pictures, videos, and other multimedia content.
Realizing the natural interaction between human and computer information is bound to become the future development trend. For LCD, plasma, LED and other displays, projectors (front, rear), etc., size from 15 inches to 250 inches can support; with multi-screen interactive features, a computer can connect up to 4 touch screen; Driver-free, touch screen and PC host can be used directly after connection, without the need to install the driver, after replacing a different computer can still be used normally. No special surface coating is required, the picture is high-definition and dust-proof; another key advantage of the optical touch is that there is usually no direct contact with a finger, a pen, or other recognized hardware. This reduces the possibility of touch screen failure due to contact failure, aging, and fatigue. This is also related to the requirement of low pressure touch. In an optical touch system, as long as it is in contact with the light beam, there is no need to detect force or trigger the system.
