OPTICAL TOUCH DEVICE AND LIGHT SOURCE ASSEMBLY
An optical touch device includes a sensing area, a first linear light source disposed next to a first side of the sensing area, a light penetration and reflection component disposed between the first linear light source and the first side, and a light sensing component configured to have a field of view of the entire sensing area. The light penetration and reflection component includes a substrate and a light penetration and reflection structure disposed on the substrate. The light penetration and reflection structure includes a plurality of prime pillars protruding from a surface, opposite to the first linear light source, of the substrate and thereby forming a plurality of reflection regions and light penetration regions. The prism pillars each are configured to have a length direction parallel to the first side. Each prime pillar has at least a reflection surface. The reflection surfaces are included in the reflection regions.
Latest PixArt Imaging Inc. Patents:
The present invention relates to a touch device, and more particularly to an optical touch device and a light source assembly thereof.
BACKGROUNDTouch function has become one of the essential features of many today's electronic devices, and touch device is one of the common electronic devices capable of realizing the touch function. Basically, the present touch devices are categorized to: resistive type, capacitive type and optical type. Thus, various electronic devices can adopt various types of touch device based on different touch requirements.
The light sensing component 130 is configured to detect a light-blocking object in the sensing area 116 and determine the light-blocking object' position. As shown in
However, the conventional optical touch device 100 may have a blind zone 150 which is located near the lower left corner of the sensing are 116; wherein the blind zone means a specific area, in which the touch point's coordinate is difficult to be accurately calculated. For example, as shown in
Therefore, one object of the present invention is to provide an optical touch device to avoid the blind zone issue.
Another object of the present invention is to provide a light source assembly adopted in an optical touch device to solve the blind zone issue.
Still another object of the present invention is to provide a light source assembly adopted in an optical touch device to solve the blind zone issue.
The present invention provides an optical touch device, which includes a sensing area, a first linear light source, a light penetration and reflection component and a light sensing component. The first linear light source is disposed next to a first side of the sensing area. The light penetration and reflection component is disposed between the first linear light source and the first side. The light penetration and reflection component includes a substrate and a light penetration and reflection structure disposed on the substrate. The light penetration and reflection structure includes a plurality of prime pillars protruding from a surface, opposite to the first linear light source, of the substrate and thereby forming a plurality of reflection regions and a plurality of light penetration regions. The prism pillars each are configured to have a length direction parallel to the first side. Each prime pillar has at least a reflection surface. The reflection surfaces are included in the reflection regions. The light sensing component is configured to have a field of view of the entire sensing area.
In an embodiment of the present invention, each prism pillar has two reflection surfaces configured to be titled and connected to each other. Each adjacent two prime pillars are configured to have a gap therebetween. The gaps are included in the light penetration regions.
In an embodiment of the present invention, each prism pillar has two reflection surfaces, configured to be titled to each other, and a light penetration portion, configured to be connected between the two reflection surfaces. The light penetration portions are included in the light penetration regions.
In an embodiment of the present invention, the light penetration portion is configured to have a curve or a flat structure.
In an embodiment of the present invention, each adjacent two prime pillars are configured to be connected to each other.
In an embodiment of the present invention, one of the light penetration portions is configured to have an orthogonal projection area A1 on the surface of the substrate; the prism pillar is configured to have an area A2 on the surface of the substrate; and 1/20≦A1/A2≦⅕.
In an embodiment of the present invention, each adjacent two prime pillars are configured to have a gap therebetween, the gaps are included in the light penetration regions.
In an embodiment of the present invention one of the light penetration portions is configured to have an orthogonal projection area A1 on the surface of the substrate; the prism pillar is configured to have an area A2 on the surface of the substrate; the gap is configured to have an area of A3; and 1/20≦(A1/A3)/A2≦⅕.
In an embodiment of the present invention, each prism pillar is configured to have a plurality of V-shaped grooves disposed on a top surface thereof opposite to the first leaner light source. Each V-shaped groove is configured to have two groove walls. The groove walls of the V-shaped grooves are included in the reflection surfaces. The light penetration and reflection structure further includes a plurality of platforms configured to protrude from the surface of the substrate opposite to the linear light source. The platforms and the prism pillars are arranged alternately. The platforms are included in the light penetration regions.
In an embodiment of the present invention, the light penetration and reflection structure is formed in a central area of the surface of the substrate.
In an embodiment of the present invention, the aforementioned optical touch device further includes a second linear light source disposed next to a second side of the sensing area. The second side is configured to be opposite to the first side.
In an embodiment of the present invention, the aforementioned optical touch device further includes a third linear light source and a mirror. The third linear light source is disposed next to a third side of the sensing area. The third side is configured to be connected between the first and second sides. The light sensing component is disposed in a connection area of the second and third sides. The mirror is disposed next to a fourth side of the sensing area. The fourth side is configured to be opposite to the third side.
In an embodiment of the present invention, the aforementioned optical touch device further includes a display panel. The sensing area is formed on a display surface of the display panel.
In an embodiment of the present invention, the aforementioned optical touch device further includes a plate, on which the sensing area is formed.
The present invention further provides a light source assembly of an optical touch device, which includes a linear light source and a light penetration and reflection component. The linear light source is disposed next to a side of a sensing area of the optical touch device. The light penetration and reflection component is disposed between the first linear light source and the side. The light penetration and reflection component includes a substrate and a light penetration and reflection structure disposed on the substrate. The light penetration and reflection structure includes a plurality of prime pillars protruding from a surface, opposite to the first linear light source, of the substrate and thereby forming a plurality of reflection regions and a plurality of light penetration regions. The prism pillars each are configured to have a length direction parallel to the side. Each prime pillar has at least a reflection surface. The reflection surfaces are included in the reflection regions.
The present invention still provides a light source assembly of an optical touch device, which includes a linear light source and a light penetration and reflection component. The linear light source is disposed next to a side of a sensing area of the optical touch device. The light penetration and reflection component is disposed between the linear light source and the side. The light penetration and reflection component includes a plurality of optical micro-structures. Each optical micro-structure includes a top portion, a bottom portion and at least a reflection surface. The top portion is configured to be opposite to the linear light source. The reflection surface(s) is configured to be connected between the top portion and the bottom portion. At least one of the top portion and the bottom portion has a flat region. Each reflection surface is configured to be titled relative to the flat region(s).
In an embodiment of the present invention, the optical micro-structure is a triangular pillar, a trapezoidal pillar, or a combination of the triangular pillar and the trapezoidal pillar.
In an embodiment of the present invention, the bottom portion of each optical micro-structure is the flat region. The top portion has a plurality of V-shaped grooves. Each V-shaped groove is configured to have two groove walls. The groove walls of the V-shaped grooves are the reflection surface.
In an embodiment of the present invention, the linear light source includes a light guide strip. The top portions of the optical micro-structures are configured to be connected to the light guide strip.
In an embodiment of the present invention, each adjacent two optical micro-structures are configured to be connected to each other.
In an embodiment of the present invention, each adjacent two optical micro-structures are configured to have a distance therebetween.
In summary, the optical touch device according to the embodiments of the present invention is implemented with a conventional optical touch device and a light source assembly, which is constituted by a light penetration and reflection component and an extra linear light source; wherein the linear light source is disposed opposite to the light penetration and reflection component and configured to enhance light source. According to the aforementioned structure, the optical touch device of the present invention can calculate the position coordinate of a touch point (or, a light-blocking object) more accurately so as to solve the blind zone issue. Thus, the optical touch device adopting the light source assembly of the present embodiment avoids the blind zone issue occurring in the conventional optical touch device, and the objects of the developments of the present invention are realized.
The above embodiments will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:
The disclosure will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
Please refer back to
The light penetration and reflection structure according to the present invention may have some modulations; followings are the detailed descriptions of the light penetration and reflection structure structures according to various embodiments.
Please refer to
Please refer to
Please refer to
According to the aforementioned various light penetration and reflection structures disclosed in the embodiments illustrated in
In the aforementioned embodiments, the light penetration and reflection component 230 is exemplified by having the light penetration and reflection structures 232, 232a, 232b or 232c disposed on the substrate 231. In another embodiment, the light penetration and reflection component 230 may include the light penetration and reflection structure only without the substrate 231. It is to be noted that the light penetration and reflection component 230 without the substrate 231 still can provide full functions as the light penetration and reflection component 230 with the substrate 231 does.
Moreover, the light penetration and reflection component 230 and the linear light source 220 in the embodiments can be referred to as a light source assembly.
In summary, the optical touch device according to the embodiments of the present invention is implemented with a conventional optical touch device and a light source assembly, which is constituted by a light penetration and reflection component and an extra linear light source; wherein the linear light source is disposed opposite to the light penetration and reflection component and configured to enhance light source. According to the aforementioned structure, the optical touch device of the present invention can calculate the position coordinate of a touch point (or, a light-blocking object) more accurately so as to solve the blind zone issue. Thus, the optical touch device adopting the light source assembly of the present embodiment avoids the blind zone issue occurring in the conventional optical touch device, and the objects of the developments of the present invention are realized.
While the disclosure has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the disclosure needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
Claims
1. An optical touch device, comprising:
- a sensing area;
- a first linear light source disposed next to a first side of the sensing area;
- a light penetration and reflection component disposed between the first linear light source and the first side, the light penetration and reflection component comprising a substrate and a light penetration and reflection structure disposed on the substrate, the light penetration and reflection structure comprising a plurality of prime pillars protruding from a surface, opposite to the first linear light source, of the substrate and thereby forming a plurality of reflection regions and a plurality of light penetration regions, the prism pillars each being configured to have a length direction parallel to the first side, each prime pillar comprising at least a reflection surface, the reflection surfaces being included in the reflection regions; and
- a light sensing component configured to have a field of view of the entire sensing area.
2. The optical touch device according to claim 1, wherein each prism pillar comprises two reflection surfaces configured to be titled and connected to each other, each adjacent two prime pillars are configured to have a gap therebetween, and the gaps are included in the light penetration regions.
3. The optical touch device according to claim 1, wherein each prism pillar comprises two reflection surfaces, configured to be titled to each other, and a light penetration portion, configured to be connected between the two reflection surfaces, the light penetration portions are included in the light penetration regions.
4. The optical touch device according to claim 3, wherein the light penetration portion is configured to have a curve or a flat structure.
5. The optical touch device according to claim 3, wherein each adjacent two prime pillars are configured to be connected to each other.
6. The optical touch device according to claim 5, wherein one of the light penetration portions is configured to have an orthogonal projection area A1 on the surface of the substrate, the prism pillar is configured to have an area A2 on the surface of the substrate, and 1/20≦A1/A2≦⅕.
7. The optical touch device according to claim 3, wherein each adjacent two prime pillars are configured to have a gap therebetween, the gaps are included in the light penetration regions.
8. The optical touch device according to claim 7, wherein one of the light penetration portions is configured to have an orthogonal projection area A1 on the surface of the substrate, the prism pillar is configured to have an area A2 on the surface of the substrate, the gap is configured to have an area of A3, and 1/20≦(A1/A3)/A2≦⅕.
9. The optical touch device according to claim 1, wherein each prism pillar is configured to have a plurality of V-shaped grooves disposed on a top surface thereof opposite to the first leaner light source, each V-shaped groove is configured to have two groove walls, the groove walls of the V-shaped grooves are included in the reflection surfaces, the light penetration and reflection structure further comprises a plurality of platforms configured to protrude from the surface of the substrate opposite to the linear light source, the platforms and the prism pillars are arranged alternately, the platforms are included in the light penetration regions.
10. The optical touch device according to claim 1, wherein the light penetration and reflection structure is formed in a central area of the surface of the substrate.
11. The optical touch device according to claim 1, further comprising a second linear light source disposed next to a second side of the sensing area, wherein the second side is configured to be opposite to the first side.
12. The optical touch device according to claim 11, further comprising:
- a third linear light source disposed next to a third side of the sensing area, the third side being configured to be connected between the first and second sides, the light sensing component being disposed in a connection area of the second and third sides; and
- a mirror disposed next to a fourth side of the sensing area, wherein the fourth side is configured to be opposite to the third side.
13. The optical touch device according to claim 1, further comprising a display panel, the sensing area is formed on a display surface of the display panel.
14. The optical touch device according to claim 1, further comprising a plate, on which the sensing area is formed.
15. A light source assembly of an optical touch device, comprising:
- a linear light source disposed next to a side of a sensing area of the optical touch device; and
- a light penetration and reflection component disposed between the first linear light source and the side, the light penetration and reflection component comprising a substrate and a light penetration and reflection structure disposed on the substrate, the light penetration and reflection structure comprising a plurality of prime pillars protruding from a surface, opposite to the first linear light source, of the substrate and thereby forming a plurality of reflection regions and a plurality of light penetration regions, the prism pillars each being configured to have a length direction parallel to the side, each prime pillar comprising at least a reflection surface, the reflection surfaces being included in the reflection regions.
16. A light source assembly of an optical touch device, comprising:
- a linear light source disposed next to a side of a sensing area of the optical touch device; and
- a light penetration and reflection component disposed between the linear light source and the side, the light penetration and reflection component comprising a plurality of optical micro-structures, each optical micro-structure comprising a top portion, a bottom portion and at least a reflection surface, the top portion being configured to be opposite to the linear light source, the reflection surface(s) being configured to be connected between the top portion and the bottom portion, at least one of the top portion and the bottom portion comprising a flat region, each reflection surface being configured to be titled relative to the flat region(s).
17. The light source assembly of an optical touch device according to claim 16, wherein the optical micro-structure is a triangular pillar, a trapezoidal pillar, or a combination of the triangular pillar and the trapezoidal pillar.
18. The light source assembly of an optical touch device according to claim 16, wherein the bottom portion of each optical micro-structure is the flat region, the top portion comprises a plurality of V-shaped grooves, each V-shaped groove is configured to have two groove walls, and the groove walls of the V-shaped grooves are the reflection surface.
19. The light source assembly of an optical touch device according to claim 16, wherein the linear light source comprises a light guide strip, the top portions of the optical micro-structures is configured to be connected to the light guide strip.
20. The light source assembly of an optical touch device according to claim 16, wherein each adjacent two optical micro-structures are configured to be connected to each other.
21. The light source assembly of an optical touch device according to claim 16, wherein each adjacent two optical micro-structures are configured to have a distance therebetween.
Type: Application
Filed: May 16, 2012
Publication Date: Jun 20, 2013
Applicant: PixArt Imaging Inc. (Hsinchu City)
Inventors: Hung-Ching Lai (Hsinchu), Hui-Hsuan Chen (Hsinchu), Chi-Chieh Liao (Hsinchu)
Application Number: 13/473,582
International Classification: G06F 3/042 (20060101);