음향 벌크 웨이브 터치 센서는 디스플레이 표면의 유리 커버 레이어입니다. X 및 Y 변환기는 유리의 인접한 모서리에 용접되고 한 쌍의 차폐 케이블로 컨트롤러에 연결됩니다. 각 케이블 쌍은 신호선과 접지선에 각각 연결됩니다. 삼각형 실드는 X 및 Y 변환기와 연결된 케이블을 보호합니다. 45도 각도 반사 스트라이프 어레이는 도파관으로 유리의 양쪽을 따라 에칭됩니다. 반사판은 서로 반대입니다. 가장자리는 올바른 음향 에코를 보장하기 위해 연마되었습니다.
The touch sensor can be laminated on any thickness of glass to increase durability, riot resistance and safety. It can also be laminated directly on CRT or flat panel displays. Use silicone gel as the lamination medium.
Acoustic bulk wave touch screen technology is based on transmitting high-frequency sound waves through the touch sensor covering the surface of the display. The detection work is to continuously monitor the touch sensor to determine whether there is a touch. It includes the following processes
(1) Transmit sound waves and wait for reflected wave response.
(2) Digital reflected wave response.
(3) Analyze the signal and determine the touch activity.
(4) Send the verification result to the host.
transmit and receive sound waves
X and Y transducers alternately emit sound waves (in transmission mode). The transducer is installed in the upper left corner of the sensor and converts electrical pulses into sound waves. The transducer emits multi{{0}}cycle ultrasonic waves into the sensor glass at a velocity of 0.135 inches/microsecond.
The sound wave propagates along the reflection fringe, is reflected by the reflection fringe to the opposite light edge, and then reflected back to the fringe array, and then converted to the transducer (in receiving mode). The first reflector sends a signal back, then the second, the third, and so on. Then decompose the anti-lr signal to separate the noise from the effective information.
Digital reflection signal
X or Y transducer receives the reflected signal, amplifies and demodulates the signal and converts it into a digital signal. Adjust the amplitude if necessary.
Analyze digital signals
Fingers or other media that can absorb sound waves touch the sensor, which absorbs the energy of the sound waves and reduces the amplitude of the waves. This energy attenuation appears on the signal as a drop in amplitude. The touch is detected by comparing the current digitized data with the previous detection or reference data. The different results of the current and previous data are processed through the digital filter to determine whether there is a touch and a touch position on the sensor (brother: K is the coordinate, Z is the pressure axis).
Send the test result to the host
The controller transmits the coordinates to the main processor, and the main processor processes the data for use by the application program.
