MULTI-TOUCH AND PROXIMATE OBJECT SENSING APPARATUS USING SENSING ARRAY

• US 20110115749A1
• Filed: 11/15/2010
• Published: 05/19/2011
• Est. Priority Date: 11/13/2009
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: YI, Kwon Ju, Han, Jae Joon, Park, Du-Sik, Choi, Chang Kyu
• Application Number:
  US12/946,411
• Publication Number:
  US 20110115749A1
• 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 3/0386 for light pen
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

A multi-touch and proximate object sensing apparatus using a sensing array is provided. The multi-touch and proximate object sensing apparatus may sense a touch image or a target image by sensing an invisible light which is projected to a diffuser through the sensing array. Also, the multi-touch and proximate object sensing apparatus may display an image on a display panel by controlling a location of the sensing array and a visible light source, without a backlight unit.

Claims

1. A sensing apparatus, comprising:

a diffuser where an invisible light is projected;

a visible light source, arranged below the diffuser, to emit a visible light to the diffuser; and

a sensing array, arranged below the diffuser, to sense the invisible light which is projected to the diffuser.

2. The sensing apparatus of claim 1, further comprising:

an invisible light source, arranged above the diffuser, to emit the invisible light, wherein the invisible light is used to sense a touch image or a target image generated by an object.

3. The sensing apparatus of claim 2, further comprising:

a light guide, arranged above the diffuser, to totally and internally reflect the invisible light emitted from the invisible light source,

wherein the invisible light source emits the invisible light to an inside of the light guide or to the object.

4. The sensing apparatus of claim 2, wherein the sensing array senses the invisible light reflected by the object when the object is arranged above the diffuser or is spaced apart from an upper side of the diffuser by a predetermined distance.

5. The sensing apparatus of claim 3, wherein, when the invisible light emitted from the invisible light source is totally and internally reflected in the light guide, the sensing array senses a location where the total internal reflection is obscured by the object.

6. The sensing apparatus of claim 2, wherein the invisible light source is spaced apart from the diffuser by a predetermined distance and emits the invisible light to the diffuser to sense the touch image.

7. The sensing apparatus of claim 6, wherein the invisible light source emits the invisible light orthogonally to the diffuser or at a predetermined angle to the diffuser.

8. The sensing apparatus of claim 1, wherein the visible light source is arranged below and orthogonally to the diffuser, and emits the visible light directly to the diffuser.

9. The sensing apparatus of claim 1, wherein the visible light source is arranged below an edge of the diffuser, and emits the visible light to the diffuser by reflecting the visible light through a waveguide.

10. The sensing apparatus of claim 1, wherein the sensing array detects coordinates of the invisible light source, the coordinates of the invisible light source being indicated by sensing the invisible light projected to the diffuser.

11. The sensing apparatus of claim 1, wherein the sensing array detects a location of a shadow occurring inside the diffuser, the shadow occurring when the invisible light is blocked by the object.

12. The sensing apparatus of claim 1, wherein the visible light source is selectively turned on or off based on image data, sensed through the sensing array, or controls a light quantity based on the image data.

13. A sensing apparatus, comprising:

a diffuser where an invisible light is projected; and

a sensing array, arranged below the diffuser, to sense the invisible light which is projected to the diffuser.

14. The sensing apparatus of claim 13, further comprising:

an invisible light source, arranged above the diffuser, to emit the invisible light to sense a touch image or a target image, the touch image or the target image being generated by an object.

15. The sensing apparatus of claim 14, wherein the invisible light source emits the invisible light to an inside of a light guide for total internal reflection, and the sensing array senses a location where the total internal reflection is prevented by the object, when the invisible light emitted from the invisible light source is totally and internally reflected in the light guide.

16. The sensing apparatus of claim 15, wherein the object is arranged above the light guide or is spaced apart from an upper side of the light guide by a predetermined distance, and the sensing array senses the invisible light reflected by the object.

17. The sensing apparatus of claim 14, wherein the invisible light source is spaced apart from the diffuser by a predetermined distance and emits the invisible light to sense the touch image to the diffuser.

18. The sensing apparatus of claim 14, wherein the invisible light source emits the invisible light orthogonally to the diffuser or emits the invisible light at a predetermined angle with the diffuser.

19. The sensing apparatus of claim 14, further comprising:

a visible light source to emit a planar visible light through the diffuser.

20. The sensing apparatus of claim 19, wherein the visible light source is arranged below the diffuser, and emits the visible light directly towards the diffuser.

21. The sensing apparatus of claim 18, further comprising a second invisible light source arranged above the diffuser and positioned near an edge of a light guide whereby the second invisible light source emits the invisible light to an inside of the light guide for total internal reflection.

22. The sensing apparatus of claim 19, further comprising a waveguide arranged below the diffuser, wherein the visible light source is arranged at an edge of the waveguide, and emits the visible light to the diffuser by reflecting the visible light through the waveguide.

23. A sensing apparatus, comprising:

an Organic Light Emitting Diode (OLED) to emit a visible light;

an OLED panel where the OLED is arranged;

an invisible light source, arranged above the OLED panel, to project invisible light towards the OLED panel; and

a sensing array, arranged below the OLED panel, to sense the invisible light that is projected towards the OLED panel.

24. The sensing apparatus of claim 23, wherein the invisible light is used to sense a touch image or a target image generated by an object.

25. The sensing apparatus of claim 23, further comprising a second invisible light source arranged above the OLED panel and positioned near an edge of the OLED panel.

26. A sensing apparatus with a touchable surface, the sensing apparatus comprising:

a diffuser, arranged below the touchable surface;

an invisible light source, arranged above the diffuser, to emit an invisible light;

a visible light source, arranged below the diffuser, to emit a visible light towards the diffuser;

a sensing array, arranged below the diffuser, to sense the invisible light; and

a controller to selectively control a quantity of the visible light projected towards the diffuser.

27. The sensing apparatus of claim 26, wherein the sensing array is arranged as a two-dimensional matrix of sensors to measure an invisible light intensity across one or more two dimensional coordinates of the touchable surface.

28. The sensing apparatus of claim 27, further comprising a display configured to display an image that is viewable on the touchable surface.

29. The sensing apparatus of claim 28, wherein when an object is sensed by the sensing array as being placed in contact with or above a portion of the touchable surface, an appearance of the displayed image is changed.

30. The sensing apparatus of claim 28, wherein when an object is sensed by the sensing array as being placed above a portion of the touchable surface, an appearance is changed of a portion of the displayed image corresponding to the portion of the touchable surface approached by the object.

31. The sensing apparatus of claim 30, wherein the change in appearance of the portion of the displayed image comprises a change in brightness of the portion of the displayed image, which brightness is changed by changing a quantity of the visible light projected towards the diffuser.

32. The sensing apparatus of claim 29, wherein the controller may control the quantity of the visible light corresponding to an area of the touch depending on an intensity of the touch.