# Patent

## Title
Optical touch device

## Abstract

An optical touch module includes an LED circuit board and a control circuit board. Multiple LED components are disposed on one face of the LED circuit board. The other face faces the control circuit board. The other face of the control circuit board is connected with the at least one L-shaped connection board. A first connector and a second connector are positioned in a space between overlapping sections of the LED circuit board and the control circuit board and mated with each other. The control circuit board has at least one third connector mated with a fourth connector of the L-shaped connection board. Electronic components and/or an extension section of a filter member are positioned in the space.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application is a continuation of U.S. patent application Ser. No. 14/056,951, filed on Oct. 18, 2013, titled Optical Touch Module and Device Thereof, listing Cheng-Nan Lien, Jinhua Tan, Zijun Meng and Chih-Wei Chang as inventors.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a touch module and a device thereof, and more particularly to an optical touch module and a device thereof.
2. Description of the Related Art
Due to the promotion of the quality of LED and the advance of the manufacturing process, optical touch module has the advantages of high transparency, sensitivity to touch of any material and applicability to large-size device. Accordingly, optical touch module is currently widely applied to various displays. The principle of the optical touch display is to employ LED transmitters and LED receivers arranged on opposite sides of the surface of the display. The infrared LEDs around the surface of the display screen form a dense infrared network in X axis and Y axis on the surface. When a nontransparent object interrupts the infrared ray, the X-axis and Y-axis coordinates are naturally found. The infrared LEDs are independent from each other. The location can be achieved simply by means of analyzing the interruption position. Finally, a control circuit calculates and transmits the signal to a PC to show the touch position on the screen. Alternatively, other programs will execute other signal operation and application. The infrared touch panel is triggered by means of interrupting the LED infrared signal so that the signal can be triggered without touching the substrate. Therefore, the infrared touch panel has the advantage of high sensitivity.
FIG. 1A is a top view of a conventional infrared touch device 10. The infrared touch device 10 includes a frame body composed of four infrared touch modules 11. Two sets of corresponding LED transmitters 12 and LED receivers 13 are respectively disposed on two opposite sides of the frame body. The LED transmitters 12 are respectively aimed at the LED receivers 13.
FIG. 1B is a sectional view taken along line X-X of FIG. 1A, which shows the cross section of one side of the infrared touch device 10 for illustrating the composition of one infrared touch module 11 (as shown in FIG. 1A). The LED transmitter is taken as an example in the drawing. However, the LED receiver has the same composition. The infrared touch circuit module includes a control circuit board 111 on which an LED circuit board 112 is disposed. The LED transmitter 12 is disposed on the LED circuit board 112. Control IC is disposed on the control circuit board 111 for controlling the LED transmitter 12 of the LED circuit board 112. The control circuit board 111 and the LED circuit board 112 are connected with each other by means of soldering. Accordingly, multiple first soldering points 15 of solder material are formed between the opposite faces of the control circuit board 111 and the LED circuit board 112 in predetermined positions. The control circuit board 111 and the LED circuit board 112 are connected through the first soldering points 15, whereby the signals of the two circuit boards are transmitted through the first soldering points 15. In general, in consideration of the signal transmission between the two circuit boards, there is more than one first soldering point 15. Generally, the solder material is formed of those metal materials with lower melting point, such as tin.
Please refer to FIG. 1C, which is a perspective view of the conventional infrared touch device composed of four infrared touch modules 11 connected with each other to form the frame body. Four L-shaped connection boards 16 are used as four corners of the frame body. Each L-shaped connection board 16 is connected between two infrared touch modules 11 of two sides of the frame body. That is, each infrared touch module 11 is connected between two L-shaped connection boards 16. The four infrared touch modules 11 are connected with each other via the four L-shaped connection boards 16 to form the frame body.
Please now refer to FIG. 1D, which is a sectional view taken along line Y-Y of FIG. 1C. The four L-shaped connection boards 16 are disposed under the control circuit board 111 and connected therewith by means of soldering. Multiple second soldering points 17 of solder material are formed between the control circuit board 111 and the L-shaped connection boards 16 in predetermined positions. By means of the second soldering points 17, the four infrared touch modules 11 are connected with each other for signal transmission therebetween.
According to the above, each L-shaped connection board 16 is connected between the control circuit boards 111 of two infrared touch modules 11 of two sides of the frame body. In general, there are more than one first soldering point 15 and more than one second soldering point 17. Therefore, it takes long time to complete the soldering operation and it is hard to control the quality. Moreover, it is impossible to arrange any component on the opposite faces of the control circuit board 111 and the LED circuit board 112, that is, the overlapping sections of the two circuit boards. As a result, the infrared touch device 10 has a large invalid area. This is unbeneficial to circuit design and it is hard to rework or service the device.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an optical touch module and a device thereof. In the optical touch module, the LED circuit board and the control circuit board are connected with each other by means of connectors for signal transmission between the two circuit boards. The connectors can be repeatedly plugged and unplugged so that it is convenient to locate and assemble the optical touch modules without any soldering process. In this case, the malfunction due to improper soldering operation can be avoided. Moreover, the optical touch module is easy to rework and service and reassemble into the original state.
It is a further object of the present invention to provide the above optical touch module and the device thereof. In the optical touch module, the LED circuit board and the control circuit board are connected with each other by means of connectors, whereby a height gap exists between the opposite faces of the LED circuit board and the control circuit board. This increases usable space so that electronic components with a height smaller than that of the connectors can be arranged on the opposite faces of the LED circuit board and the control circuit board. Also, an extension section of a filter member can extend into the space to increase the connection strength as a whole.
To achieve the above and other objects, the optical touch module of the present invention includes: an LED circuit board having a first top face and a first bottom face, multiple LED components being disposed on the first top face, the first bottom face having at least one first connector; and a control circuit board positioned under the LED circuit board, the control circuit board having a second top face and a second bottom face, the second top face facing the first bottom face of the LED circuit board and having at least one second connector correspondingly in adaptation to the first connector, the second bottom face having at least one third connector, the first and second connectors being vertically mated with each other so as to connect the control circuit board under the LED circuit board, a height gap existing between the LED circuit board and the control circuit board, whereby a space is positioned between correspondingly overlapping sections of the first bottom face of the LED circuit board and the second top face of the control circuit board, the first and second connectors being positioned in the space.
The optical touch device of the present invention includes: multiple optical touch modules and multiple L-shaped connection boards, which are assembled to form a frame body, each optical touch module including: an LED circuit board having a first top face and a first bottom face, multiple LED components being disposed on the first top face, the first bottom face having multiple first connectors; and a control circuit board positioned under the LED circuit board, the control circuit board having a second top face and a second bottom face, the second top face facing the first bottom face of the LED circuit board and having at least one second connector correspondingly in adaptation to the first connectors, the second bottom face having at least one third connector, each L-shaped connection board having a third top face facing the second bottom face of the control circuit board, the third top face of the L-shaped connection board having at least one fourth connector correspondingly in adaptation to the third connector, the L-shaped connection board being positioned under two adjacent control circuit boards, the first and second connectors being vertically mated with each other and the third and fourth connectors being also vertically mated with each other, whereby the control circuit board is connected under the LED circuit board and the L-shaped connection board is connected under the control circuit board, a height gap existing between the LED circuit board and the control circuit board, whereby a space is positioned between correspondingly overlapping sections of the first bottom face of the LED circuit board and the second top face of the control circuit board, the first and second connectors being positioned in the space.
Alternatively, the optical touch device of the present invention includes: multiple optical touch modules each including: an LED circuit board having a first top face and a first bottom face, multiple LED components being disposed on the first top face, the first bottom face having multiple first connectors; and a control circuit board positioned under the LED circuit board, the control circuit board having a second top face and a second bottom face, the second top face facing the first bottom face of the LED circuit board and having at least one second connector correspondingly in adaptation to the first connectors, the second bottom face having at least one third connector; multiple L-shaped connection boards each having a third top face facing the second bottom face of the control circuit board, the third top face of the L-shaped connection board having at least one fourth connector correspondingly in adaptation to the third connector, the L-shaped connection board being positioned under two adjacent control circuit boards, the first and second connectors being vertically mated with each other and the third and fourth connectors being also vertically mated with each other, whereby the control circuit board is connected under the LED circuit board and the L-shaped connection board is connected under the control circuit board, a height gap existing between the LED circuit board and the control circuit board, whereby a space is positioned between correspondingly overlapping sections of the first bottom face of the LED circuit board and the second top face of the control circuit board, the first and second connectors being positioned in the space; and multiple filter members respectively connected with the optical touch modules, each filter member including: a main body; an upper protrusion section extending from an upper end of the main body to one side thereof; and an extension section extending from a lower end of the main body to one side thereof, the upper protrusion section extending to upper sides of the LED components, the main body being positioned in front of the LED components to shield the LED components, the extension section extending into the space between the first bottom face of the LED circuit board and the second top face of the control circuit board.



BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:
FIG. 1A is a top view of a conventional infrared touch device;
FIG. 1B is a sectional view taken along line X-X of FIG. 1A;
FIG. 1C is a perspective view of the conventional infrared touch device composed of four infrared touch modules connected with each other to form a frame body;
FIG. 1D is a sectional view taken along line Y-Y of FIG. 1C;
FIG. 2 is an exploded view of the optical touch module of the present invention;
FIG. 3A is an assembled view of the optical touch module of the present invention;
FIG. 3B is a view of a part of the optical touch module of the present invention;
FIG. 4 is a perspective exploded view of the optical touch device of the present invention;
FIG. 5A is an exploded view of the optical touch device of the present invention;
FIG. 5B is an assembled view of the optical touch device of the present invention;
FIG. 6A is a sectional view of the optical touch device of the present invention, which has a filter member;
FIG. 6B is a top view of the optical touch device of the present invention, which has a filter member; and
FIG. 6C is a perspective view of the filter member.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Please refer to FIGS. 2 and 3A. FIG. 2 is an exploded view of the optical touch module of the present invention. FIG. 3A is an assembled view of the optical touch module of the present invention. The optical touch module 20 of the present invention includes an LED circuit board 21 and a control circuit board 22. The LED circuit board 21 has a first top face 211 and a first bottom face 212. Multiple LED components 213 are disposed on the first top face 211. The first bottom face 212 has at least one first connector 214. The control circuit board 22 is positioned under the LED circuit board 21. The control circuit board 22 has a second top face 221 and a second bottom face 222. The second top face 221 faces the first bottom face 212 of the LED circuit board 21 and has at least one second connector 224 for correspondingly plug-connecting with the first connector 214. The second bottom face 222 has at least one third connector 225 positioned near two ends.
The first connector 214 is a male connector, while the second connector 224 is a female connector in adaptation to the first connector 241. Alternatively, the first connector 214 is female connector, while the second connector 224 is a male connector in adaptation to the first connector 241. The first and second connectors 214, 224 can be correspondingly plug-connected with each other or disconnected from each other so that the connectors can be flexibly replaced. The connector means a medium for connecting two or more objects, such as a socket, a terminal or wiring harness. The connector generally means the connection component and the accessory thereof applied to electronic signal transmission and power supply as a bridge between the interrupted or isolated circuits for passing of current and making the circuits function.
The first and second connectors 214, 224 are vertically mated with each other so as to connect the control circuit board 22 under the LED circuit board 21. A height gap p exists between the LED circuit board 21 and the control circuit board 22, whereby a space 23 is positioned between the correspondingly overlapping sections of the first bottom face 212 of the LED circuit board 21 and the second top face 221 of the control circuit board 22. The first and second connectors 214, 224 are positioned in the space 23. The height gap p is defined by the total thickness of the first and second connectors 214, 224 mated with each other.
Please now refer to FIG. 3B, which is a view of a part of the touch module. The space 23 exists between the overlapping sections of the first bottom face 212 of the LED circuit board 21 and the second top face 221 of the control circuit board 22. Under such circumstance, at least one electronic component can be arranged in the space 23. The electronic component has a height smaller than the height of the first connector 214 or the second connector 224. In the drawing, an electronic component 261 is disposed under the first bottom face 212 of the LED circuit board 21 in a position avoiding the first connector 214. In addition, an electronic component 262 is disposed on the second top face 221 of the control circuit board 22 in a position avoiding the second connector 224. The two electronic components 261, 262 are positioned in the space 23.
Please now refer to FIG. 4, which is a perspective exploded view of the optical touch device of the present invention. Four optical touch modules 20 are connected with each other by means of four L-shaped connection boards 30 to form the optical touch device in the form of a frame body. The four L-shaped connection boards 30 serve as four corners of the frame body. Each L-shaped connection board 30 is connected between two optical touch modules 20 of two sides of the frame body. That is, two ends of each optical touch module 20 are respectively connected with two L-shaped connection boards 30. The two sets of LED components 213 of the optical touch modules 20 on two opposite sides of the frame body correspond to each other. The LED components 213 on one side are infrared transmitters, while the LED components 213 on the opposite side are infrared receivers.
Please now refer to FIGS. 5A and 5B. FIG. 5A is an exploded view of the optical touch device of the present invention. FIG. 5B is an assembled view of the optical touch device of the present invention. The L-shaped connection boards 30 are respectively disposed on outer sides of two ends of the control circuit board 22 of each optical touch module 20. In the drawings, only the L-shaped connection board 30 at one end is shown. The L-shaped connection board 30 has a third top face 31 on which at least one fourth connector 32 is disposed.
The first bottom face 212 of the LED circuit board 21 of the optical touch module 20 faces the second top face 221 of the lower control circuit board 22. The first connector 214 is vertically mated with the second connector 224, whereby the control circuit board 22 is connected under the LED circuit board 21. The second bottom face 222 of the control circuit board 22 faces the third top face 31 of the L-shaped connection board 30. The third connector 225 is vertically mated with the fourth connector 32, whereby the L-shaped connection board 30 is connected under the control circuit board 22. Accordingly, the four corners of the optical touch device are three-layer structures in which three layers are piled up and spaced from each other. The uppermost layer is the LED circuit board 21, the middle layer is the control circuit board 22, while the lowermost layer is the L-shaped connection board 30.
The height gap p not only exists between the LED circuit board 21 and the control circuit board 22, but also exists between the control circuit board 22 and the L-shaped connection board 30. The space 23 is positioned between the correspondingly overlapping sections of the first bottom face 212 of the LED circuit board 21 and the second top face 221 of the control circuit board 22. In addition, a space 36 exists between the overlapping sections of the second bottom face 222 of the control circuit board 22 and the third top face 31 of the L-shaped connection board 30. The first and second connectors 214, 224 are positioned in the space 23, while the third and fourth connectors 225, 32 are positioned in the space 36.
The electronic component 261 disposed under the first bottom face 212 of the LED circuit board 21 and the electronic component 262 disposed on the second top face 221 of the control circuit board 22 are positioned in the space 23.
Please refer to FIGS. 6A, 6B and 6C. FIG. 6A is a sectional view of the optical touch device of the present invention, which has a filter member. FIG. 6A is a top view of the optical touch device of the present invention, which has a filter member. FIG. 6C is a perspective view of the filter member. The optical touch device of the present invention further includes a filter member 40 disposed in front of each optical touch module 20 to shield the LED components 213 from the interference of the environmental light. The filter member 40 such as an infrared filter member is made of a plastic material to which a dye is added. The infrared filters are generally classified into two types. The first type is high-pass filter, which is transparent to the light with a wavelength larger than 850 nm or 940 nm. The second type is low-pass filter, which is transparent to the light with a wavelength within a range from 925 nm to 955 nm. The above filter member is only an example and not intended to limit the material or form of the filter member of the present invention. Other suitable filter members are also applicable to the present invention.
The filter member 40 includes a main body 41, an upper protrusion section 42 extending from an upper end of the main body 41 to one side thereof and an extension section 43 extending from a lower end of the main body 41 to one side thereof. The upper protrusion section 42 extends to upper sides of the LED components 213. The main body 41 is positioned in front of the LED components 213 to shield the same. The extension section 43 extends into the space 23 between the first bottom face 212 of the LED circuit board 21 and the second top face 221 of the control circuit board 22.
The extension section 43 is formed with recesses 44 in positions of the first and second connectors 214, 224 and the electronic components 261, 262 in the space 23. Therefore, the extension section 43 can extend into the space 23 without interfering with the first and second connectors 214, 224 or the electronic components 261, 262. An adhesive layer 45 is disposed between a lower surface of the extension section 43 and the control circuit board 22. The adhesive layer 45 has adhesion on both faces, whereby the extension section 43 is adhered to the control circuit board 22. The adhesive layer 45 is such as a double-faced adhesive tape or the like.
In conclusion, four optical touch modules 20 are connected with each other by means of four L-shaped connection boards 30 to form the optical touch device of the present invention in the form of a frame body. By means of the first and second connectors 214, 224 and the third and fourth connectors 225, 32, the LED circuit boards 21 and the control circuit boards 22 of the optical touch modules 20 are connected with each other and the four optical touch modules 20 and the L-shaped connection boards 30 are connected with each other. Accordingly, not only the signals can be transmitted between the two circuit boards, but also the signals can be transmitted between the optical touch modules 20. The first and second connectors 214, 224 and the third and fourth connectors 225, 32 can be repeatedly plugged and unplugged. Therefore, it is convenient to locate and assemble the optical touch modules 20 without any soldering process. In this case, the malfunction due to improper soldering operation can be avoided. Moreover, the optical touch modules are easy to rework and service and reassemble into the original state. A height gap p exists between the opposite faces of the LED circuit board 21 and the control circuit board 22. This increases usable space so that electronic components with a height smaller than that of the first and second connectors 214, 224 can be arranged on the opposite faces of the LED circuit board 21 and the control circuit board 22. Also, the extension section 43 of the filter member 40 can be positioned in the space to increase the connection strength as a whole.
The present invention has been described with the above embodiments thereof and it is understood that many changes and modifications in the above embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.

## Claims

1. An optical touch module used to connect to at least one L-shaped connection board, the optical touch module comprising:
an LED circuit board having a first top face and a first bottom face, multiple LED components being disposed on the first top face, the first bottom face having at least one first connector; and
a control circuit board positioned under the LED circuit board, the control circuit board having a second top face and a second bottom face, the second top face facing the first bottom face of the LED circuit board and having at least one second connector correspondingly in adaptation to the first connector, the second bottom face having at least one third connector connecting to the L-shaped connection board, the first and second connectors being vertically mated with each other so as to connect the control circuit board under the LED circuit board, a height gap existing between the LED circuit board and the control circuit board, whereby a space is positioned between correspondingly overlapping sections of the first bottom face of the LED circuit board and the second top face of the control circuit board, the first and second connectors being positioned in the space, wherein at least one electronic component is disposed under the first bottom face of the LED circuit board and positioned in the space.

2. The optical touch module as claimed in claim 1, wherein at least one electronic component is disposed on the second top face of the control circuit board and positioned in the space.

3. The optical touch module as claimed in claim 1, wherein at least one electronic component is disposed between correspondingly overlapping sections of the first bottom face of the LED circuit board and the second top face of the control circuit board.

4. The optical touch module as claimed in claim 1, wherein an extension section of a filter member is positioned in the space.

5. The optical touch module as claimed in claim 4, wherein the extension section of the filter member is formed with at least one recess in a position of the first and second connectors.

6. The optical touch module as claimed in claim 1, wherein the first connector is a male connector or a female connector, while the second connector is a female connector or a male connector.

7. The optical touch module as claimed in claim 1, wherein the L-shaped connection board having at least one fourth connector correspondingly in adaptation to the third connector.