Infra-red ray emission and receiving circuit board unit and infra-red ray touch screen using same

Abstract

The invention discloses an infrared transmitting or receiving circuit board unit which can be cut and spliced at any position. The circuit board is provided with a power line, a grounding line, a clock signal line or a transport protocol line, an infrared pulse signal line and an infrared receiving signal line, which run through the circuit board unit. An encoder which is provided with a control input port, and a row driver and a column driver which are controlled and gated by the encoder are arranged at one end of the circuit board unit. An infrared touch screen of any size can be produced by splicing pieces of the circuit board unit. Through the corresponding ports on a controller unit, various circuit board units can be connected together and are capable of making a synchronous fractional scanning so as to increase scanning speed effectively. The invention is not necessary to aim at infrared touch screens of various sizes for making a second development, which significantly increases production efficiency, product quality stability and consistency, and reduces initial investment cost and quickens upgrade speed without limitation on adding or expanding more product categories.

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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