Method for improving precision of infrared touch screen

An infrared touch screen and touch screen technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve the problem of inaccurate coordinate values ​​and achieve the effect of improving resolution

Active Publication Date: 2011-03-09
中航华东光电有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] like figure 1 As shown in the infrared touch screen, due to the large distance between the two lights, when the touch object moves from the dotted line position POS1 to the solid line position POS2, the voltage AD conversion value scanned by TH4_RH4, the voltage AD conversion value scanned by TH5_RH5, and the voltage AD converted value scanned by TH6_RH6 There is no change in the voltage AD conversion value, so the in-axis scanning method is used, even if some advanced interpolation algorithms are used, the calculated coordinate values ​​​​are not very accurate because there is no real reliable input

Method used

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  • Method for improving precision of infrared touch screen
  • Method for improving precision of infrared touch screen

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Embodiment Construction

[0016] The present invention will be further described below with reference to the accompanying drawings in conjunction with the embodiments, so that those skilled in the art can better understand the present invention and implement it, but the given embodiments are not intended to limit the present invention.

[0017] Such as figure 2 , for each receiving light, scanning can realize three transmitting lights within the range, for the receiving light RHi, turn on the transmitting lights THi-1, THi, THi+1 in sequence, and for the receiving light RVi, turn on the transmitting lights TVi-1, TVi in turn , TVi+1, so that each receiving light corresponds to three transmitting lights.

[0018] When initially powered on, ensure that the touch screen is not blocked, scan for a week, and record the scanning value of each receiving light corresponding to the transmitting light: AD_INI_RH1_TH1, AD_INI_RH1_TH2, AD_INI_RH2_TH1, AD_INI_RH2_TH2, AD_INI_RH2_TH3... ..........AD_INI_RHn-1_THn,...

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Abstract

The invention relates to a method for improving the precision of an infrared touch screen, which comprises the following steps: firstly determining the rough position through in-axis scanning, then carrying out trigonometric calculation through off-axis light and the rough position, obtaining the more accurate virtual position, and then carrying out linear interpolation for calculating the precise touch position through the virtual position according to the scanned voltage AD value. The method has the advantages that a pair of virtual lamps is created between two lamps through the off-axis scanning and the rough coordinate calculation, thereby solving the problem that the position of a touched object can not be precisely distinguished due to too large distance between the lamps.

Description

【Technical field】 [0001] The invention belongs to an infrared touch screen, in particular to a photoelectric detection method used in an infrared touch screen. 【Background technique】 [0002] The composition of an existing infrared touch screen is as follows: several infrared emission tubes are installed on the two edges of the touch screen, and each emission tube is controlled by the controller, which can be opened or closed at any time, and installed on the other two edges of the touch screen Infrared receiving tubes, the total number of receiving tubes is the same as the total number of transmitting tubes, each receiving tube is aligned with one transmitting tube, each receiving tube is controlled by the controller, and can be opened or closed at any time. For this kind of infrared touch screen, due to the large distance between the two lights, there will be a small blind area between the two lights. When the touch object moves a small distance, it will not cause the chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 郎立国康涛
Owner 中航华东光电有限公司
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