US 2014/0176964 A1Published application

Optical touch system

AssigneePixart Imaging Inc.

InventorsTzung Min Su, Yu Chia Lin, Kuan Hsun Wang, Chuan-Ching Lin, Chih Hsin Lin

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Abstract

An optical touch system comprises a first light-emitting unit, a second light-emitting unit, a first image sensor having a first filter, and a second image sensor having a second filter. The first light-emitting unit generates first wavelength band light. The second light-emitting unit generates second wavelength band light. The first light-emitting unit generates first wavelength band light when the first image sensor is capturing an image. The first filter allows first wavelength band light to enter into the first image sensor and blocks second wavelength band light. The second light-emitting unit generates second wavelength band light when the second image sensor is capturing an image. The second filter allows second wavelength band light to enter into the second image sensor and block first wavelength band light.

Claims23

Dependent claims

An optical touch system comprising:

at least one first light-emitting unit configured to generate first wavelength band light;
at least one second light-emitting unit configured to generate second wavelength band light;
at least one first image sensor comprising a first filter, wherein the at least one first light-emitting unit is configured to generate the first wavelength band light when the at least one first image sensor is capturing images, and the first filter is configured to allow the first wavelength band light to enter into the at least one first image sensor and to prevent the second wavelength band light from entering into the at least one first image sensor;
and
at least one second image sensor comprising a second filter, wherein the at least one second light-emitting unit is configured to generate the second wavelength band light when the at least one second image sensor is capturing images, and the second filter is configured to allow the second wavelength band light to enter into the at least one second image sensor and to prevent the first wavelength band light from entering into the at least one second image sensor.

2 more elements

An optical touch system comprising:

a first group of image-sensing devices disposed on a side of a touch area, the first group of image-sensing devices comprising:
a first image-sensing device comprising a light-emitting unit and an image sensor comprising a filter, wherein the light-emitting unit of the first image-sensing device is configured to generate first wavelength band light when the image sensor of the first image-sensing device is capturing images;
and
a second image-sensing device comprising a light-emitting unit and an image sensor comprising a filter, wherein the light-emitting unit of the second image-sensing device is configured to generate second wavelength band light when the image of the second image-sensing device is capturing images, wherein the filter of the first image-sensing device is configured to allow the first wavelength band light to pass through and to block the second wavelength band light, and the filter of the second image-sensing device is configured to allow the second wavelength band light to pass through and to block the first wavelength band light;
a second group of image-sensing devices disposed on another side of the touch area opposite to the side, the second group of image-sensing devices comprising:
a third image-sensing device comprising a light-emitting unit and an image sensor comprising a filter, wherein the light-emitting unit of the third image-sensing device is configured to generate the first wavelength band light when the image sensor of the third image-sensing device is capturing images;
and
a fourth image-sensing device comprising a light-emitting unit and an image sensor comprising a filter, wherein the light-emitting unit of the fourth image-sensing device is configured to generate the second wavelength band light when the image sensor of the fourth image-sensing device is capturing images, wherein the filter of the third image-sensing device is configured to allow the first wavelength band light to pass through and to block the second wavelength band light, and the filter of the fourth image-sensing device is configured to allow the second wavelength band light to pass through and to block the first wavelength band light;
and
a processor configured to sequentially control the first and second group of image-sensing devices to capture images.

7 more elements

Dependencies are inferred from the claim text.