The LED display is a flat panel display, consisting of a small LED module panel, used to display various information such as text, images, video, video signals. LED, short for light-emitting diode is a diode made of a compound of gallium (Ga) and arsenic (As), phosphorus (P), nitrogen (N), indium (In) by controlling the display mode of a semiconductor light-emitting diode, it can radiate visible light and thus can be used to make light-emitting diodes when electrons and holes combined. Used as an indicator light in circuits and instruments, or as a text or digital display. The gallium arsenide diode emits red light, the gallium phosphide diode emits green light, the silicon carbide diode emits yellow light, and the indium gallium nitride diode emits blue light.
The interactive LED screen is an integrated device that controls the content displayed on the display panel through touch technology and realizes human-computer interaction. This device integrates various functions of the projector, electronic whiteboard, curtain, audio, TV, video conferencing terminal, is most suitable for group communication occasions, and centrally catering to the needs of remote audio and video communication in conferences, and high-definition display of conference documents in various formats. System video conferencing, video file playback, live audio, screenwriting, document labeling, saving, printing, and distribution. It also includes built-in TV reception and surrounds sound, which can also meet the needs of audio-visual entertainment. Widely used in education, teaching, business meetings, business presentations, etc., it can effectively improve the communication environment and improve the efficiency of group communication.
The hardware part of the interactive LED screen is composed of three parts: the touch positioning recognition system, the display system, and the intelligent processing system. The whole structural components are combined together and also supported by a dedicated software system. When the user touches the screen with a finger or a passive pen, the touch system positions the point coordinates, thereby implementing control of the intelligent processing system, and then implementing different functional applications through software built into the intelligent processing system.
There are two types of touch positioning systems for an Interactive LED screen. One is a geminate tube touch interactive LED screen that uses an infrared matrix densely packed in the X and Y directions to detect and locate the user’s touch. The infrared touch screen is surrounded by an infrared receiving tube and an infrared emitting tube. The infrared tubes are arranged in a one-to-one relationship on the surface of the touch screen to form an optical network formed by infrared rays. When the user touches the screen, the controller will determine the coordinate position of the contact when the main infrared light passes through the point is blocked by the finger or other opaque objects.
Another is infrared imaging touch interactive LED screen. The CMOS camera installed in the upper left corner emits light through the LED light, which is reflected by the surrounding reflective strips into the CMOS camera in the upper right corner. Similarly, the light emitted by the CMOS camera in the upper right corner is transmitted to the left CMOS camera. The densely covered light forms a light net in the touch area, and the light gap after multiple reflections is less than 1mm. When a certain point is touched, the emitted light and the received light of the point will form an angle, and the two lights form two angles with a straight line between the CMOS cameras in the left and right respectively and by calculating the exact coordinates of the point to achieve a touch response.