Infrared touch screen performance improving structure and method

Infrared touch screen performance improving structure and method

  • CN 1,335,548 A
  • Filed: 07/24/2000
  • Published: 02/13/2002
  • Est. Priority Date: 07/24/2000
  • Status: Abandoned Application
First Claim
Patent Images

1. structure that improves infrared touch screen performance, this structure are used by four edges along the display surface of display, and the vertical and horizontal infrared of arranging receives the pipe array in a certain order;

  • Respectively with above-mentioned array in each two groups of analog switch array being connected of emission and corresponding receiving tube thereof only;

    be connected, produce the scanning generator that the switching sequence break-make is instructed with analog switch array;

    And be of coupled connections with the signal processing circuit of infrared receiving tube corresponding simulating switch arrays signal output part;

    One is connected with the input/output port of host computer, and is connected, controls the microcomputer system of above-mentioned part work respectively with each part mentioned above by I/O mouth line;

    In the program storage that is stored in described microcomputer, be used to touch the touch trace routine of judgement;

    In the infrared touch panel that driver constituted that is installed in the host computer;

    It is characterized in that;

    At the driving input end of the described analog switch that is connected with infrared transmitting tube, be connected with a drive current restricting circuits or element;

    And in described signal Processing amplifying circuit, also be connected with a numerical control gain amplifier and an A/D transducer;

    Numerical control gain amplifier input terminal and other signal processing circuit are of coupled connections, and the analog input end of output terminal and described A/D transducer is of coupled connections, and gain control end is connected with the I/O mouth line of microcomputer system;

    The I/O mouth line of the data output end of A/D transducer and microcomputer system is of coupled connections;

    In the storer of described microcomputer system, store a diode canonical reference value, gain relatively operation part module and one section gain control code;

    Relatively code can be to each data that obtain from described A/D transducer in this gain, compare computing with described normal data, and with operation result according to certain address arrangement mode, store in the storage unit of microcomputer system internal storage, constitute the tabulation of gain control;

    The gain control code is embedded in to touch and detects in the master routine, can be when described master routine senses touch incident, connect the connection of pipe order according to the infrared emission of being controlled by analog switch array by described scanning generator, read above-mentioned gain control tabulation successively, by the described I/O mouth line feedback output that is connected with the numerical control gain amplifier.

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