Infrared touch screen circuit suitable for strong ambient light

An infrared touch screen and ambient light technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve the problem of increasing system cost and design complexity, increasing single signal sampling cycle, and affecting the effect of touch and other issues to achieve the effect of increasing the scope of use, reducing power consumption, and achieving low cost

Active Publication Date: 2016-10-05
PQ LABS INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if high-frequency modulation is used, the system cost and design complexity will generally be greatly increased
However, if the switch mode modulation is used, it is necessary to switch the infrared emitting light multiple times to ensure that the envelope of the signal can be effectively sampled, which will greatly increase the sampling period of a single signal, resulting in large-scale infrared touch screens, especially multi-point The problem of low sampling frequency in the application will eventually affect the effect of touch

Method used

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  • Infrared touch screen circuit suitable for strong ambient light
  • Infrared touch screen circuit suitable for strong ambient light
  • Infrared touch screen circuit suitable for strong ambient light

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Experimental program
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Embodiment

[0043] like figure 1 As shown, an infrared touch screen circuit that can work under strong ambient light is composed of a plurality of controlled infrared light sources 1 , a plurality of infrared receiving sensors and their signal processing circuits 2 , and a main controller 3 .

[0044] like figure 2 As shown, the above-mentioned controlled infrared light emitting source is composed of a power supply module 11 , a switching module 12 and an infrared light emitting diode 13 .

[0045] The above-mentioned power supply module 11 converts the input power of the touch screen into a power that can directly drive the infrared light-emitting diode 13 through a conventional voltage-current conversion circuit.

[0046] The above-mentioned switching module 12 is controlled by the main controller 3 to control the rapid opening or closing of the infrared light emitting diode 13 . Generally, it can be realized by quickly cutting off or turning on the power supply of the infrared light...

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Abstract

The invention relates to an infrared touch screen circuit suitable for strong ambient light. The infrared touch screen circuit comprises a plurality of controlled infrared luminous sources, a plurality of infrared receiving sensors and signal processing circuits thereof corresponding to the controlled infrared luminous sources, and a main controller, wherein the main controller is independently connected with the controlled infrared luminous sources and the infrared receiving sensors and signal processing circuits thereof; the main controller controls the plurality of controlled infrared luminous sources to carry out quick switch switchover; and the infrared receiving sensors and signal processing circuits thereof receive the signal of the controlled infrared luminous sources (1), and filter ambient light components in the signal. Compared with the prior art, the infrared touch screen circuit has the advantages of wide applicable range, low implementation cost, simple circuit structure, high performance and the like.

Description

technical field [0001] The invention relates to an infrared touch screen circuit, in particular to an infrared touch screen circuit suitable for strong ambient light. Background technique [0002] Touch screen devices based on infrared principles usually use infrared light-emitting diodes as light sources, and infrared photodiodes or infrared phototransistors as receiving sensors. When a finger, pen, etc. clicks on the screen, the infrared light emitted by the light source received by the receiving sensor will be partially blocked. Therefore, the touch screen controller can judge whether there is a touch operation and determine the position of the corresponding touch point. [0003] In many practical applications, devices equipped with infrared touch screens will be placed in locations where there is direct, refracted, or reflected strong ambient light. For example, outside, in the office near the glass curtain wall, in the venue or studio with strong halogen lamps and spo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 徐志翔徐如淏
Owner PQ LABS INC
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