صفحات لمسی شفاف باید شفاف باشند. دیجیتایزرها، پدهای نوشتن و غیره صفحه نمایش لمسی نیستند. شفافیت به طور مستقیم بر جلوه بصری صفحه لمسی تأثیر می گذارد. بسیاری از انواع صفحه نمایش لمسی فیلم های کامپوزیتی چند لایه هستند، بنابراین باید چهار ویژگی را نیز شامل شوند: شفافیت، اعوجاج رنگ، بازتاب پذیری و شفافیت.
Absolute Coordinate System Touch screen is an absolute coordinate system. The essential difference from a relative positioning system such as a mouse is its intuitiveness. Its characteristic is that each positioning coordinate has nothing to do with the last positioning coordinate. The touch screen is physically an independent coordinate positioning system, and the data of each touch is converted to the coordinates on the screen through calibration.
Detecting touch and positioning. Various touch screens all rely on sensors to work, and some touch screens themselves are a set of sensors. The positioning principle and the sensors used determine the response speed, reliability, stability and life of the touch screen.
The following three most basic components constitute the touch screen system
(1) A touch screen for touch use. It is installed in front of the display screen to detect the user's touch position, and send the signal to the touch screen controller after receiving the signal. Touch screens are divided into four basic types according to their working principles and information transmission media: resistive technology touch screens, capacitive technology touch screens (including analog and near-field imaging projection capacitive touch screens), acoustic wave technology touch screens (including surface acoustic wave and acoustic bulk wave touch screens), Infrared scanning technology touch screen.
(2) A controller that can convert touch signals into control signals. The controller can be divided into RS-232 serial port, USB Pi, PS-Bus, PC/2, chipset controller and so on.
(3) set of driver software used to communicate between the controller and the operating system. The driver software uses the calibration points included in the program to convert the absolute coordinates transmitted by the touch screen controller into screen coordinates according to these calibration points. The driver also performs other operations required by related applications.
