ELECTRONIC DEVICE WITH TOUCH INPUT FUNCTION

• US 20110157092A1
• Filed: 10/27/2010
• Published: 06/30/2011
• Est. Priority Date: 12/30/2009
• Status: Abandoned Application

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: YANG, SONG-LING
• Application Number:
  US12/912,755
• Publication Number:
  US 20110157092A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 2203/04109 FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A method for controlling an electronic device with touch input function includes controlling at least two light emitting devices to emit monochromatic light to have a total internal reflection in a sheet of glass. Detecting two intersected light paths obstructed by at least two light detecting devices; sending information of the two intersected obstructed light paths to a central processing unit (CPU); and the CPU determining a position of a touch operation according to information of the two intersected obstructed light paths. An electronic device with touch input function is also provided.

Claims

1. An electronic device with touch input function, comprising:

a display unit defining an information display area;

an touch input device comprising;

a circuit board defining an opening area which has a same size and shape as the information display area;

a sheet of glass, with surface coating, positioned on the circuit board;

at least two light emitting devices positioned around the edges of the sheet of glass on the circuit board, configured for emitting monochromatic light;

at least two light detecting devices corresponding to the at least two light emitting devices positioned around the edges of the sheet of glass on the circuit board, configured for detecting the monochromatic light emitted by the light emitting device, wherein the monochromatic light emitted from one of the light emitting devices is detected by one light detecting device, each of the light detecting devices only detects the monochromatic light emitted from one light emitting device, the monochromatic light transmitted between one of the light emitting devices and corresponding light detecting device forms a light path;

a micro-processing unit configured for controlling the at least two light emitting devices to emit monochromatic light to have a total internal reflection in the sheet of glass, detecting two intersected obstructed light paths by the at least two light detecting devices, sending information of the two intersected obstructed light paths to a central processing unit (CPU); and

the CPU configured for determining a position of a touch operation according to the information of the two intersected obstructed light paths.

2. The electronic device according to claim 1, wherein the CPU is configured for performing functions according to the touch operation.

3. The electronic device according to claim 1, wherein the circuit board has two pairs of oppositely disposed sides, the number of the at least two light emitting devices are same as that of the at least two light detecting devices.

4. The electronic device according to claim 1, further comprising a frame and a back cover, wherein the touch screen, the CPU and display unit are installed in space formed between the frame and the back cover.

5. The electronic device according to claim 1, wherein the light detecting device is photosensitive element which changes optical signals into electrical signals.

6. The electronic device according to claim 5, wherein the light detecting device is high-sensitivity photodiode.

7. The electronic device according to claim 5, wherein when no touch is formed on the surface of the sheet of glass, the at least two light emitting devices emit a beam of monochromatic light, the monochromatic light has a total reflection in the sheet of glass, and the monochromatic light is received by corresponding light detecting device on the other side of the sheet of glass.

8. The electronic device according to claim 5, wherein when a touch operation is formed on the surface of the glass, the surface of the glass is deformed and monochromatic light in the sheet of glass attenuates sharply even if the deformation is slight, the electrical signals generated by the light detecting device reduce sharply, the micro-processor determines the light path between the light emitting device and corresponding light detecting device is obstructed if detects the change of the electrical signals.

9. A method for controlling an electronic device with touch input function, comprising:

controlling at least two light emitting devices to emit monochromatic light to have a total internal reflection in a sheet of glass;

detecting two intersected light paths obstructed by at least two light detecting devices;

sending information of the two intersected obstructed light paths to a central processing unit (CPU); and

the CPU determining a position of a touch operation according to information of the two intersected obstructed light paths.

10. The method according to claim 9, wherein the method further comprises performing functions according to the touch operation.

11. The method according to claim 9, wherein the number of the at least two light emitting devices are same as that of the at least two light detecting devices.

12. The method according to claim 9, wherein the light detecting device is photosensitive element which changes optical signals into electrical signals.

13. The method according to claim 12, wherein the light detecting device is high-sensitivity photodiode.

14. The method according to claim 12, wherein when no touch is formed on the surface of the sheet of glass, the at least two light emitting devices emit a beam of monochromatic light, the monochromatic light has a total reflection in the sheet of glass, and the monochromatic light is received by corresponding light detecting device on the other side of the sheet of glass.

15. The method according to claim 12, wherein the step of detecting light paths obstructed via at least two light detecting devices comprises:

when a touch operation is formed on the surface of the glass, the surface of the glass is deformed and monochromatic light in the sheet of glass attenuates sharply even if the deformation is slight, the electrical signals generated by the light detecting device reduce sharply, determining the light path between the light emitting device and the corresponding light detecting device is obstructed if detects the change of the electrical signals.