Ambient light self-adaption method and apparatus for infrared touch screen
An infrared touch screen and ambient light technology, which is applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve the problems of non-representative sampling and uneven distribution of light intensity, and achieve non-representative sampling Effects of issues, savings, and number of ambient light samples
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Embodiment 1
[0031] figure 2 It is the structure diagram of the infrared touch screen of the preferred embodiment 1. As mentioned above, any receiving tube R 3 The effective working angle can cover the four infrared emitting areas on the opposite frame, and any infrared emitting area is covered by at least three infrared receiving tubes on the opposite frame (the edges are three due to grid defects, and the middle is four) Covered by the effective "field of view". Compared with the prior art, in this embodiment, only 4 receiving tubes are used for 10 infrared emitting tubes in a transmitting area, and only 4 receiving tubes can be set in the corresponding sample and hold circuit. 1 -C 4 , Saving the number of holding capacitors and reducing the point of failure. At the same time, since the ambient light sampling is performed on each receiving tube multiple times, the problem of light interference that occurs in the prior art due to the unrepresentative ambient light sampling does not occur....
Embodiment 2
[0038] Figure 4 Is a schematic diagram of the infrared frame structure of the preferred embodiment 2 of the present invention, Figure 5 It is a functional block diagram of the software implementation method of this embodiment (the dotted line represents the control signal, and the solid line represents the data signal).
[0039] Figure 4 The medium black square represents the receiving tube. There are 24 infrared emitting tubes between any two black squares. The receiving and sending tubes on the Y axis and the infrared emitting tubes on the X axis are omitted in the figure. Looking at the picture, an infrared emitting area is formed between any two adjacent receiving tubes. Each infrared emitting area is covered by the effective receiving angles of multiple receiving tubes on the opposite frame. The infrared frame includes infrared emitting circuits and infrared. Receiving circuit and control unit. The control unit (control chip, single-chip microcomputer, MCU) includes at le...
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