OPTICAL TOUCH SCREEN

• US 20130100085A1
• Filed: 07/12/2011
• Published: 04/25/2013
• Est. Priority Date: 08/02/2010
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Son, Sukwoo
• Granted Patent: US 9,342,185 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/0428 by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual sensing beam interruptions in a planar beam grid of an optical touch-screen G06F3/0421

Abstract

The present invention relates to an optical touch screen, including a flat plate display panel, a case mounted and assembled with the flat plate display panel, brackets assembled on the case, a camera module mounted on the brackets, and an iris formed on the brackets and through which infrared incident on the camera module passes.

Claims

1. An optical touch screen, the touch screen characterized by:

a flat plate display panel;

a case mounted and assembled with the flat plate display panel;

brackets assembled on the case;

a camera module mounted on the brackets; and

an iris formed on the brackets and through which infrared incident on the camera module passes.

2. The optical touch screen of claim 1, characterized in that the bracket includes first and second fixtures fixed on the case, and a connector connected to the first and second fixtures, wherein the iris is connected to the connector.

3. The optical touch screen of claim 2, characterized in that the camera module is connected to the connector.

4. The optical touch screen of claim 2, characterized in that the connector is formed with guides, and the guides are fixed by an infrared filter.

5. The optical touch screen of claim 4, characterized in that the iris is closed by the infrared filter, and the infrared is incident on the camera module through the infrared filter and the iris.

6. The optical touch screen of claim 3, characterized in that the connector is formed with a passage through which the infrared emitted from the camera module passes.

7. The optical touch screen of claim 6, characterized in that the camera module is mounted with an infrared light emitting diode, wherein the infrared emitted from the infrared light emitting diode is emitted to an upper surface of the flat plate display panel through the passage.

8. The optical touch screen of claim 6, characterized in that the passage is mounted with a lens.

9. The optical touch screen of claim 8, characterized in that a light leakage prevention sill is formed at a connection of the bracket between the iris and the lens.

10. The optical touch screen of claim 1, characterized in that the camera module includes an infrared light emitting diode emitting an infrared, an object lens collecting infrared reflected from a retro reflector, an infrared passage filter passing a particular waveband, and a linear sensor detecting an area touched by incidence of infrared having passed the infrared passage filter.

11. The optical touch screen of claim 10, characterized in that the camera module includes a holder formed at one side with a first groove, formed at the other side with a second groove, and formed with an opening connecting the first groove and the second groove, wherein the first groove is mounted with the object lens, the second groove is mounted with the infrared passage filter, and a printed circuit board mounted with the image sensor to close the second groove is attached to the holder.

12. The optical touch screen of claim 11, characterized in that a stair unit is formed at a lateral upper surface of the holder, and the stair unit is mounted with the infrared light emitting diode.

13. The optical touch screen of claim 11, characterized in that the infrared passage filter is implemented by coating an infrared passage filter material on a glass.

14. The optical touch screen of claim 1, characterized in that the case takes the shape of a square ring.

15. The optical touch screen of claim 14, characterized in that the bracket is formed at a corner of the case.

16. The optical touch screen of claim 14, characterized in that three inner corners of the square ring-shaped case are fixed by brackets on which the camera module is mounted, and one inner corner of the square-ring shaped case is mounted with a dummy bracket on which the camera module is not mounted.

17. The optical touch screen of claim 16, characterized in that a retro reflector is mounted on an inner lateral surface of the case among the brackets.