Optical touch device

An optical touch and light sensing technology

Pending Publication Date: 2021-04-16
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention prevents incorrect input by detecting if there are lights on an electronic device screen during user interaction with it's display surface (such as for example through capacitive technology). This helps prevent errors caused by accidental contact between fingers that may be mistakenly used instead of their actual identity being displayed onscreen.

Problems solved by technology

This patented technical problem addressed in this patents relates to how excessive electrical current can flow through certain areas within an optoelectrode array (OCA) without being detected accurately even if there were no light detection signals from any other rows during its operation time period.

Method used

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Examples

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

[0032] figure 1 It is a simplified functional block diagram of the optical touch device 100 according to an embodiment of the present invention. The optical touch device 100 includes a plurality of light-sensing pixel columns 110-1-110-7, a plurality of compensation current sources 120-1-120-4, and a plurality of readout lines RL. Each of the light-sensing pixel columns 110-1˜110-7 includes a plurality of light-sensing pixels 130 commonly coupled to a corresponding readout line RL. In some embodiments, the optical touch device 100 may include a plurality of scanning lines and a scanning driving circuit for enabling the photo-sensing pixels 130 column by column, and may also include a scanning result for reading the photo-sensing pixels 130 Multiple readout circuits (such as integrators), may also include display modules, for th

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PUM

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Abstract

An optical touch device includes a plurality of light sensing pixel rows and a plurality of compensation current sources. Each compensation current source is coupled to one of a plurality of light-sensing pixel columns. The magnitude of the current provided by each compensation current source is negatively related to the number of light sensing pixels included in one of the aforementioned light sensing pixel columns.

Description

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Claims

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Application Information

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Owner AU OPTRONICS CORP
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