Optical touch display device, optical touch sensing device and touch sensing method
First Claim
1. An optical touch display device, comprising:
- a display panel;
at least a first light source and a second light source disposed close to a periphery of the display panel for substantially simultaneously emitting a light, wherein a traveling direction of the light is substantially parallel to the display panel, the light emitted from the light sources substantially covers the display panel;
at least one light sensing element disposed close to the periphery of the display panel, the light sensing element detects a strength of the light and outputs a sensing signal based on the strength of the light; and
a processing unit electrically coupled to the light sensing element, wherein the processing unit receives the sensing signal and generates a position signal based on the sensing signal.
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Abstract
The present invention provides an optical touch display device, an optical touch sensing device, and a method for calculating a touch position. The optical touch sensing device can be detachably attached on a display panel using adhesive or other method. The present invention includes a first light source, a second light source, a light sensing element, and a processing unit. When an object blocks the path of light, some light sensing elements will receive some or no light. The processing unit will then compute two line segments based on the positions of light sensing elements receiving some or no light. The two line segments cross each other and their intersection is defined as the position of object or the touch position.
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Citations
20 Claims
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1. An optical touch display device, comprising:
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a display panel; at least a first light source and a second light source disposed close to a periphery of the display panel for substantially simultaneously emitting a light, wherein a traveling direction of the light is substantially parallel to the display panel, the light emitted from the light sources substantially covers the display panel; at least one light sensing element disposed close to the periphery of the display panel, the light sensing element detects a strength of the light and outputs a sensing signal based on the strength of the light; and a processing unit electrically coupled to the light sensing element, wherein the processing unit receives the sensing signal and generates a position signal based on the sensing signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An optical touch sensing device disposed close to a display panel, the optical touch sensing device comprising:
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a frame disposed near an edge of the display panel; at least a first light source and a second light source disposed close to an edge of the frame for substantially simultaneously emitting a light, wherein a traveling direction of the light substantially parallel to the display panel, the light emitted from the light sources substantially covers the display panel; at least one light sensing element disposed on the display panel and disposed near an edge of the display panel, the light sensing element detects a strength of the light and outputs a sensing signal based on the strength of the light; and a processing unit electrically coupled to the light sensing element, wherein the processing unit receives the sensing signal and generates a position signal based on the sensing signal.
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17. A method for calculating a touch position on a touch panel, comprising the following steps:
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emitting a light toward at least one light sensing element using a first light source and a second light source, wherein the first light source, the second light source, and the light sensing element are disposed close to a periphery of a display panel or an edge of a frame; comparing a sensing signal generated by each light sensing element with a corresponding signal level of the light sensing element to obtain a first reference position and a second reference position; calculating a first line segment based on the first reference position and a position of the first light source and calculating a second line segment based on the second reference position and a position of the second light source, wherein the first line segment intersects the second line segment; and calculating a touch position based on the first line segment and the second line segment. - View Dependent Claims (18, 19, 20)
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Specification