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Fault pipe fast searching method of infrared touch screen

An infrared touch screen, touch screen technology, applied in the input/output process of data processing, measuring devices, instruments, etc., can solve problems such as unimaginable workload, time-consuming and labor-intensive

Inactive Publication Date: 2010-05-12
上海仪电电子多媒体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the traditional method is adopted without the use of automatic testing methods such as software, it is a time-consuming and labor-intensive project to measure one tube by one with a multimeter, especially in mass production.

Method used

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  • Fault pipe fast searching method of infrared touch screen
  • Fault pipe fast searching method of infrared touch screen

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Embodiment Construction

[0021] The invention provides a method for quickly searching for faulty tubes of an infrared touch screen. In the method, the firmware program of the infrared touch screen can self-check when it is powered on, scan the infrared grid several times under standard lighting conditions, and read the information of each phototransistor. The voltage value is the change amount when there is no blockage and when there is no infrared light irradiation. If the change amount is less than the limit value, it is judged as a bad tube.

[0022] The inventive method is described in further detail below:

[0023] figure 1 is a schematic diagram of the hardware structure involved in the method. As shown in the figure: the outer frame of the touch screen is installed with an array of infrared emitting tubes and an array of infrared receiving tubes in the horizontal and vertical directions according to the one-to-one correspondence between the emitting tubes and the receiving tubes, forming an in...

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PUM

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Abstract

The invention relates to a fault detection method of infrared light-emitting diodes and infrared photistors forming infrared gratings in an infrared touch screen, in particular to a fast searching method of failed tubes in the infrared touch screen. In the method, electricity on firmware program of the infrared touch screen can be self-examined, infrared grids are scanned for a plurality of timesunder standard illumination condition, the voltage value of each photistor is read for obtaining the variable quantity when in absence of blockage and infrared illumination, and the tube is judged tobe the broken one if the variable quantity is smaller than the limited value. The invention can maximally eliminate the influence of high failure rate of the infrared touch screen, and is favorable for the fast overhauling of failed touch screen, and can greatly reduce the production and maintenance costs.

Description

technical field [0001] The invention relates to a fault detection method for an infrared light-emitting diode and an infrared photosensitive triode forming an infrared grating in an infrared touch screen, in particular to a quick search method for a fault tube of the infrared touch screen. Background technique [0002] The scanning technology of the infrared touch screen relies on the interruption of the infrared grating in front of the display screen. The touch frame includes an array of infrared light-emitting diodes and a phototransistor array in the X and Y directions, and they are installed relatively parallel in a one-to-one correspondence mode of transmitting and receiving, thereby forming an invisible infrared grating. The touch screen controller makes the diode arrays in the X and Y directions sequentially light up and emit infrared beams. When an obstacle such as a finger enters the beam grid, it blocks the beam, so that one or several photosensitive transistors de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042G01R31/00G01R31/27
Inventor 李波峰肖阿玲
Owner 上海仪电电子多媒体有限公司
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