TWI407351B - Electronic device having infrared touching panel - Google Patents

Abstract

An electronic device includes an infrared touching unit and a display screen. The infrared touching unit includes a plurality of infrared emitters, a plurality of infrared receivers, and a plurality of printed circuit boards (PCB). The PCBs are arranged around the display screen and are substantially parallel to the edges of the display screen, respectively. Each of the infrared emitters and infrared receivers is vertically mounted on the relative PCB. The infrared touch unit further includes a plurality of light-guiding members, each of the light-guiding columns is fixed on one of the PCBs, corresponding to one of the infrared emitters and infrared receivers. Each of the light-guiding members includes a base and an angled portion angled from the base. The coupled light-guiding members have their angled portion facing each other for transmitting the infrared signal of the infrared emitter to the corresponding infrared receiver.

Description

Electronic device with infrared touch function

The present invention relates to an electronic device, and more particularly to an electronic device having an infrared touch function.

The optical path system of the photoelectric detecting system of the current infrared touch screen is in the frame structure at the front of the display, and a corresponding one of the infrared transmitting tube and the receiving tube is installed on four sides. When the infrared touch screen is working, the infrared transmitting tube and the receiving tube are sequentially illuminated, and in the case of no touch, each infrared light is unblocked. When a touch object touches the touch screen, the touch object blocks the horizontal and vertical infrared rays of the corresponding position, and the single chip determines the position and transmits the coordinates to the host. As shown in FIG. 1, since the circuit board 11, the infrared transmitting tube and the receiving tube 10 of the existing infrared touch screen are all mounted on the display surface of the display 12, in order to ensure that the infrared transmitting tube and the receiving tube 10 face each other to ensure smooth light path, it is required The horizontal installation, that is, the tube legs of the tube are bent 90 degrees and soldered to the circuit board 11, so that the thickness of the touch screen is relatively large, which affects the appearance of the display on which the touch screen is mounted.

In view of this, it is necessary to provide an electronic device having an infrared touch function, and to reduce the thickness of the touch screen by changing the mounting manner of the infrared transmitting tube and the receiving tube array and forming a new optical path system using the light guiding rod.

An electronic device with an infrared touch function includes an infrared touch unit and a display panel. The infrared touch unit includes a plurality of infrared transmitting tubes, an infrared receiving tube and a circuit board. The circuit board is disposed in parallel around the display panel, and the infrared transmitting tube and the infrared receiving tube are vertically mounted on the opposite circuit boards. The infrared touch unit further includes a plurality of light guiding columns, each of which is fixed on the circuit board and placed above the infrared transmitting tube and the infrared receiving tube. The light guiding column has a bent structure, and the pair of infrared transmitting tubes and the free end of the light guiding column corresponding to the receiving tube are oppositely disposed and arranged on the display panel for transmitting the infrared light signal emitted by the infrared transmitting tube to the corresponding infrared receiving tube.

Since the light guide column is used in the optical path of the electronic device, communication between the infrared transmitting tube and the receiving tube is realized by changing the propagation direction of the infrared light, so that the infrared transmitting tube and the receiving tube can be installed upright on the circuit board, so that According to the height or actual needs of the infrared transmitting tube and the receiving tube, the distance between the light guiding column and the circuit board on which the infrared transmitting tube and the receiving tube are mounted can be adjusted, thereby reducing the thickness of the touch screen and achieving an ultra-thin effect of the electronic device.

200‧‧‧Electronic devices

2‧‧‧Infrared touch unit

20‧‧‧Infrared launch tube

21‧‧‧Infrared receiver tube

22‧‧‧ Circuit board

220‧‧‧Fixed holes

23‧‧‧Light guide

230‧‧‧Support Department

231‧‧‧Support feet

232‧‧‧ notch

233‧‧‧Transmission Department

234‧‧‧reflecting surface

3‧‧‧ display panel

4‧‧‧ mask frame

5‧‧‧Back cover

FIG. 1 is a schematic view showing the installation of an infrared transmitting tube (receiving tube) in a conventional infrared touch screen.

2 is an exploded view of an electronic device having an infrared touch function according to the present invention.

3 is a schematic view showing the structure of a light guiding column of an electronic device with an infrared touch function and its installation.

4 is a view of a light guiding column structure of an electronic device with an infrared touch function according to the present invention; Sectional view in the IV-IV direction.

FIG. 5 is a schematic diagram showing the structure of an optical path of an electronic device having an infrared touch function according to the present invention.

The invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 2 , an electronic device 200 with an infrared touch function includes an infrared touch unit 2 , a display panel 3 , a mask frame 4 , and a back cover 5 . The infrared touch unit 2 and the display panel 3 are placed between the mask frame 4 and the back cover 5. The infrared touch unit 2 is mounted between the display panel 3 and the mask frame 4. The infrared touch unit 2 includes a plurality of infrared transmitting tubes 20, a plurality of infrared receiving tubes 21, and a circuit board 22. The circuit board 22 is a strip-shaped structure that is disposed in parallel around the display panel 3, and the four circuit boards 22 are substantially on the same horizontal line as the four sides of the display panel 3. The infrared transmitting tube 20 and the infrared receiving tube 21 are respectively mounted on the opposite circuit board 22. In the embodiment, the plurality of infrared transmitting tubes 20 and the plurality of infrared receiving tubes 21 are vertically mounted on the circuit board 22, and one by one. Correspondingly, a matrix structure is formed, and the infrared transistor 21 receives the infrared signals emitted by the infrared diode 20, respectively. In this embodiment, the plurality of infrared transmitting tubes 20 are eight infrared-emitting diodes (LEDs), and the plurality of infrared receiving tubes 21 are eight infrared transistors. The number of the infrared diode 20 and the infrared transistor 21 can be increased or decreased according to actual needs.

The infrared touch unit 2 further includes a plurality of light guiding columns 23 mounted on the circuit board 22 and corresponding to the plurality of infrared transmitting tubes 20 and the infrared receiving tubes 21 in one-to-one correspondence. The height of the light guide column 23 can be adjusted according to actual needs, thereby ensuring It is proved that the thickness of the body of the electronic device 200 can meet the demand.

Referring to FIG. 3 , the light guide post 23 includes a support portion 230 and a conductive portion 233 extending outward from the support portion 230 . The support portion 230 is fixed on the circuit board 22 and above the infrared transmitting tube 20 and the infrared receiving tube 21, and the supporting portion 230 is perpendicular to the surface of the display panel 3. In the present embodiment, the support portion 230 has a substantially "gate" shape and includes a pair of support legs 231. The support portion 230 can be fitted into the fixing hole 220 of the circuit board 22 by the support leg 231 to make the support portion. 230 is connected to the circuit board 22. A notch 232 is formed between the two supporting legs 231. The size of the notch 232 is set according to the size of the infrared transmitting tube 20 and the infrared receiving tube 21 to accommodate the infrared transmitting tube 20 and the infrared receiving tube 21.

The conductive portion 233 has an L shape and is disposed on the display panel 3 of the electronic device 200. The pair of infrared transmitting tubes 20 and the free ends of the conductive portions 233 corresponding to the receiving tubes 21 are disposed opposite to each other for emitting the infrared transmitting tube 20 The infrared light signal is transmitted to the infrared receiving tube 21. Referring to FIG. 4 at the same time, the bending portion of the conducting portion 233 is provided with a reflecting surface 234 for changing the conveying direction of the infrared light signal. In the present embodiment, the reflecting surface 234 is substantially at an angle of 45 degrees to the surface of the display panel 3.

Therefore, referring to FIG. 5, the infrared light signal emitted by each of the infrared transmitting tubes 20 in the infrared emitting tube array is transmitted to the corresponding infrared receiving tube 21 via the conducting portion 233 of the light guiding column 23. The infrared transmitting tube 20 and the receiving tube 21 can be mounted on the circuit board 22 upright, and the light guiding column 23 and the infrared transmitting tube 20 and the receiving tube 21 can be adjusted according to the height or actual needs of the infrared transmitting tube 20 and the receiving tube 21. The distance between the circuit boards 22 reduces the thickness of the touch screen, so that the electronic device 200 can achieve an ultra-thin effect.

It is to be understood that those skilled in the art can make various other changes and modifications in accordance with the technical concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.

20‧‧‧Infrared launch tube

22‧‧‧ Circuit board

220‧‧‧Fixed holes

230‧‧‧Support Department

231‧‧‧Support feet

232‧‧‧ notch

233‧‧‧Transmission Department

234‧‧‧reflecting surface

Claims (4)

An electronic device with an infrared touch function, comprising an infrared touch unit and a display panel, the infrared touch unit comprises a plurality of infrared transmitting tubes, a plurality of infrared receiving tubes and four circuit boards, wherein the four circuit boards are respectively arranged in parallel The periphery of the display panel is improved in that the plurality of infrared transmitting tubes and the plurality of infrared receiving tubes are vertically mounted on the opposite circuit boards, and the infrared touch unit further includes a plurality of fixed a light guiding column on the circuit board and having a bent structure, and each of the infrared transmitting tubes and each of the infrared receiving tubes are correspondingly disposed with a light guiding column, the opposite infrared transmitting tube and the infrared receiving The free ends of the light guiding columns disposed above the tubes are disposed opposite to each other and are disposed on the display panel for transmitting infrared light signals emitted by the infrared transmitting tubes to the corresponding infrared receiving tubes. The electronic device of claim 1, wherein each of the light guide columns includes a support portion and a conductive portion extending outward from the support portion, the support portion being fixed to the circuit board and Located above the corresponding infrared transmitting tube or the infrared receiving tube; the conducting portion is L-shaped and the bending portion is provided with a reflecting surface for changing the conveying direction of the infrared light signal. The electronic device of claim 2, wherein the support portion includes two support legs that are fitted to the circuit board, and a notch is formed between the two support legs, the notch For accommodating the corresponding infrared transmitting tube and or the infrared receiving tube. The electronic device of claim 2, wherein the reflection The face is at an angle of 45 degrees to the surface of the display panel.