US 10,120,464 B2Granted

Optical touch system and optical touch method

AssigneeWistron Corporation

InventorsYu-Yen Chen, Po-Liang Huang, Pei-Chen Chin

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Abstract

An optical touch system includes two touch devices, two optical sensing devices, and a processing module. When the optical touch system is in use according to an optical touch method, the two touch device are used to touch a touch surface and emit first light and second light with different wavelengths respectively. The two optical sensing devices are disposed at the circumference of the touch surface and individually receive the first light and the second light to generate an optical sensing signal. The processing module receives the two optical sensing signals and determines a touch position on the touch surface for each touch device according to the two optical sensing signals. Therefore, the touching by each touch device is independent, so the optical touch system and the optical touch method can allow touch operations for different purposes to be performed simultaneously.

Claims13

Dependent claims

An optical touch system for sensing two touches performed on a touch surface, the optical touch system comprising:

two touch devices for performing the two touches on the touch surface respectively, one of the touch devices being capable of emitting first light when the touch device touches the touch surface, the other touch device being capable of emitting second light when the touch device touches the touch surface, a central wavelength of the first light being different to a central wavelength of the second light;
two optical sensing devices disposed at a circumference of the touch surface, each optical sensing device comprising an optical sensing unit, a first optical filter, and a second optical filter, a first sensing area and a second sensing area being defined on the optical sensing unit, the first optical filter being disposed above the first sensing area, the second optical filter being disposed above the second sensing area, the first optical filter allowing light within a first wavelength band to pass, the second optical filter allowing light within a second wavelength band to pass, the central wavelength of the first light being within the first wavelength band but not within the second wavelength band, the central wavelength of the second light being within the second wavelength band but not within the first wavelength band, each optical sensing device using the optical sensing unit to sense the first light and the second light and generating an optical sensing signal relative to the first light and the second light;
and
a processing module electrically connected to the optical sensing devices, the processing module receiving the two optical sensing signals from the two optical sensing devices and determining a touch position of each touch device on the touch surface.

1 more element

An optical touch method for an optical touch system to sense two touches on a touch surface, the optical touch system comprising two optical sensing devices, two touch devices, and a processing module electrically connected to the optical sensing devices, the two optical sensing devices being disposed at a circumference of the touch surface, each optical sensing device having an optical sensing unit, a first optical filter and a second optical filter, a first sensing area and a second sensing area being defined on the optical sensing unit, the first optical filter being disposed above the first sensing area, the second optical filter being disposed above the second sensing area, the first optical filter allowing light within a first wavelength band to pass, the second optical filter allowing light within a second wavelength band to pass, one of the touch devices being capable of emitting first light when the touch device touches the touch surface, the other touch device being capable of emitting second light when the touch device touches the touch surface, a central wavelength of the first light being different to a central wavelength of the second light, the central wavelength of the first light being within the first wavelength band but not within the second wavelength band, the central wavelength of the second light being within the second wavelength band but not within the first wavelength band, the optical touch method comprising the following steps:

(a) using the two touch devices to perform the two touches on the touch surface and emit the first light and the second light respectively;
(b) using the optical sensing unit of each optical sensing device to receive the first light and the second light and generate an optical sensing signal relative to the first light and the second light;
and
(c) using the processing module to receive the two optical sensing signals from the two optical sensing devices and determine a touch position of each touch device on the touch surface.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 14/522,598Filed 24 Oct 2014
Priority: TW 103126458 A1 Aug 2014
Published: US 2016/0034053 A14 Feb 2016
Granted: 6 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G06F 3/03542
With detection of two-dimensional [2D] relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D…
G06F 3/0421
By opto-electronic means: by interrupting or reflecting a light beam, e.g. optical touch-screen
G06F 2203/04104
Indexing scheme relating to G06F3/041 - G06F3/045: multi-touch detection in digitiser, i.e. details about the simultaneous detection of a…
G06F
Computing and data processing

Family

US 2016/0034053 A1Pre-grant publication · published 4 Feb 2016
US 10,120,464 B2This patent

From the US filing history. Foreign family members aren’t listed.

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