Infrared transmitting or receiving circuit board unit and infrared touch screen

Abstract

The invention discloses an infrared transmitting or receiving circuit board unit capable of cutting and mutual splicing on a free position as well as an infrared touch screen consisting of the circuit board unit. The circuit board unit is provided with a power cord, an earth wire, a clock signal wire or a transfer protocol control wire, an infrared pulse signal wire and an infrared receiving signal wire, wherein a line driver and a row driver are arranged in the middle of the circuit board unit. The circuit board units can be spliced to form the infrared touch screens of any size and are respectively connected through corresponding ports of a controller unit, thereby carrying out synchronous fractional scanning to effectively improve the scanning speed. The infrared transmitting or receiving circuit board unit does not need to be developed again to the infrared touch screens with different sizes, thereby greatly improving the production efficiency; meanwhile, the circuit board unit has the advantages of flexible selection of splicing points, less restriction on processing conditions and ideal product quality stability and consistency; therefore, the product updating speed can be improved and product types can be increased and expanded without restriction.

Description

technical field [0001] The invention relates to the technical field of a touch device constructed by infrared emitting and receiving photoelectric devices. Background technique [0002] Since the development of infrared touch technology, it has been relatively mature in technology. From a technical point of view, the principle is very simple, but it is particularly difficult to manufacture high-resolution touch screens of various sizes. In the existing technology, such as figure 1 , figure 2 In the shown U.S. Patent No. 5,162,783, all control circuits of the infrared touch device, including infrared emitting and receiving tubes, infrared emitting, receiving circuits and microprocessors, are all integrated on the printed circuit board around the outer frame of the touch screen, and are connected through a The RS232 serial port or USB port is connected to the computer. Since the infrared emitting and receiving tubes must be connected to the scanning circuit, if the circuit ...

AI Technical Summary

Problems solved by technology

At present, it is difficult to produce large-scale and large-scale touch screens, not to mention cutting and splicing circuit boards, which seems impossible

In fact, when the size of the infrared touch screen continues to increase, strict requirements are placed on the scanning speed of the infrared emitting and receiving tubes. If the design cannot meet the required scanning frequency, or the signal cannot be transmitted effectively, this will directly affect the capture. Response speed and use effect, the most obvious is that the strokes may be intermittent when writing, the touch is not sensitive, or the response speed is lagging, or the requirements of the handwriting function cannot be realized

From this point of view, due to the limitations of various technical bottlenecks, whether it can be effective without any influence after cutting and splicing, ensuring high-quality infrared emission and receiving signals to the microprocessor for interception object positioning judgment will become the solution The key to success or failure, it can be seen that it is particularly difficult to design a product that can freely cut the size of the printed circuit board. So far, there is no product on the market that can cut the size of the printed circuit board. Free cutting and splicing infrared touch products

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