Method for detecting touch point coordinates of infrared touch screens
An infrared touch screen and coordinate detection technology, which is applied in the input/output process of data processing, instruments, electrical and digital data processing, etc., can solve the problems of large data volume and long scanning period, reduce correlation and improve tactile response speed. , the effect of saving time
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example 1
[0039] This embodiment relates to an infrared electronic whiteboard with a single pair of frames, such as Figure 5 As shown (the black square in the figure represents the receiving tube, and several infrared emitting tubes (not shown in the figure) are installed between every two black receiving tubes at equal intervals (6mm)), the electronic whiteboard only includes a pair of infrared frames, The two infrared frames are arranged on a pair of opposite sides of the touch area of the electronic whiteboard, and the orientations are aligned.
[0040] Such as figure 1 As shown in a, a complete touch point coordinate detection process in this embodiment includes sector scanning step 10, coordinate determination step 20, coordinate checking step 30, weighted average step 40 and touch point output step 50:
[0041] Sector scan step 10 is used to perform infrared sector scan to obtain several scan lines including non-orthogonal and possibly orthogonal scan lines;
[0042] The coo...
Embodiment 2
[0059] Image 6 It is the infrared structure diagram of the preferred embodiment 2 of the present invention. This embodiment adopts the "ambush on all sides" type infrared frame, and the four sides of the touch area are provided with an infrared frame with azimuth alignment. The black square in the figure represents the infrared receiving tube. The white square represents the infrared emission tube ( Image 6not shown in ), several infrared emitting tubes are arranged at equal intervals (5mm) between the infrared receiving tubes, and any point on the screen (touch area) can be simultaneously detected by two receiving tubes on the X axis (first direction) and Covered by the effective "field of view" of the two receiver tubes on the Y axis (second direction). During coordinate detection, any touch point can be located by four scanning lines.
[0060] The implementation method of this embodiment is similar to the preferred embodiment 1, the difference is that the coordinate det...
Embodiment 1
[0076] Each touch point in embodiment 1 is covered by about four receiving tubes from different orientations (distributed in the same direction), and each touch point in embodiment 2 is covered by four receiving tubes from different directions ( Two first directions, two second directions); In other embodiments, different arrangements of transceiver lamps can also be used. In theory, as long as the number of receiving tubes covering any point on the screen exceeds 2, the touch point can be realized. detection.
[0077] In the above-mentioned embodiments, one-to-many infrared frames are used, that is, the infrared frames on both sides of the touch area are provided with transmitting tubes and receiving tubes, the transmitting tubes are densely arranged, and the receiving tubes are sparsely arranged. The working angle can cover multiple transmitting tubes on the opposite side; the completely opposite structure can also be adopted, the receiving tubes are densely arranged, and th...
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