Infrared touch screen for realizing scan driving by bus organized structure

Abstract

The invention discloses an infrared touching screen to realize scanning driving through bus structure, which is characterized by the following: setting a serial code coder of infrared launching and receiving pipe address scanning code in the micro-controller system; inserting decoding chip of decoder corresponding to the coder and address comparing unit of each address value corresponding to scanning address of infrared launching and receiving pipe in the infrared element; connecting address line, driving line or signal line system bus between coder and infrared launching and receiving pipe array; the serial code coder connects the circuit board with infrared launching pipe array and infrared receiving pipe array through connector. The invention reduces the breadth of frame to the maximum degree, which can be assembled on random display for kinds of occasion.

Description

technical field [0001] The invention relates to an improvement of a scanning drive structure of a transducing element in an infrared touch screen, and belongs to the technical field of touch screens in computer multimedia technology. technical background [0002] In the existing infrared touch screen, the driving mode of the infrared emitting tube array and the receiving tube array is to use the logic circuit chip installed on the circuit board constituting the frame of the infrared touch screen to analyze the scanning address information generated by the microcontroller system, Then select the corresponding pair of infrared emitting and receiving tubes through independent driving lines, drive the infrared emitting tube to emit infrared rays, and connect the photoelectric signal transmission channel of the corresponding infrared receiving tube, so as to realize a touch detection. For relevant technical principles, please refer to Chinese patents or patent application documen...

AI Technical Summary

Problems solved by technology

Since this drive circuit needs to install a large number of integrated circuits on the frame of the PCB (printed circuit board) as the mounting carrier of the infrared emitting tube array and receiving tube array, and the same number of connecting wires, it is difficult to reduce the size of the infrared touch screen frame PCB. The width of the display device, especially the narrower and narrower frame size of the liquid crystal display, is installed on this type of display, which makes the application of the infrared touch screen difficult to realize due to the limitation of these physical dimensions in many cases.

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