TOUCH SCREEN ADOPTING AN OPTICAL MODULE SYSTEM USING LINEAR INFRARED EMITTERS

• US 20100315383A1
• Filed: 10/12/2009
• Published: 12/16/2010
• Est. Priority Date: 10/13/2008
• Status: Abandoned Application

• Current Assignee: Hogahm Technology Co., Ltd.
• Original Assignee: Hogahm Technology Co., Ltd.
• Inventors: Jeong, Young Jin, Chang, Keun Ho, Cho, Dong Hwan
• Application Number:
  US12/918,556
• Publication Number:
  US 20100315383A1
• Time in Patent Office: Days
• US Class Current: 345/175
• 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

Disclosed is an optical modular touch screen using a linear infrared emitter, in which the linear infrared emitter is disposed at each of three or four sides of a rectangular frame defining the touch screen, and infrared rays emitted from the linear infrared emitter is detected through two or three optical modules, thereby recognizing a shadow generated by finger touch and grasping a position thereof.

The optical modular touch screen of the present invention includes a linear infrared emitter 40 which is independently disposed at least three sides 20b, 20c, 20d of frame 20 of a rectangular image screen 10 so as to emit the infrared rays; an optical module 30 which is disposed at least two or more corner portions so as to monitor the entire image screen 10; a control board 50 which analyzes an infrared signal detected by the optical module 30 and detects the touch position touched by a user.

Claims

1. A touch screen which detects a touch position on an image screen displaying an image and executes a commend corresponding to the touch position, comprising:

a linear infrared emitter which comprises a resin rod having a transparent circular shape in section and an infrared diffuse reflection line in a length direction thereof, and two infrared LEDs disposed at both ends of the resin rod so as to emit infrared rays into the resin rod, and which is independently disposed at least three sides of frame of a rectangular image screen so as to emit the infrared rays;

an optical module which is disposed at least two or more corner portions so as to monitor the entire image screen;

a control board which analyzes an infrared signal detected by the optical module and detects the touch position touched by a user.

2. The touch screen of claim 1, wherein the infrared diffuse reflection line formed at the resin rod is oriented to an outside of the frame so that the infrared rays diffuse-reflected by the infrared diffuse reflection line of the resin rod are transmitted through the resin rod in an opposite direction to the infrared diffuse reflection line and then arrived at the optical module.

3. The touch screen of claim 1, wherein the infrared diffuse reflection line of the resin rod is formed by applying an infrared reflecting paint in order to induce infrared diffuse reflection.

4. The touch screen of claim 1, wherein the infrared diffuse reflection line of the resin rod is formed by scratching a surface of the resin rod in a length direction thereof using one of a sand blast method, a laser marking method and a mechanical working method in order to induce the infrared diffuse reflection.

10. The touch screen of claim 1, wherein at least two linear infrared emitters are provided at each side of the frame to be arranged in a row.

11. The touch screen of claim 1, wherein the linear infrared emitter is independently disposed at all of the four sides of the frame of the rectangular image screen, and the optical module is disposed at least three corner portions of the rectangular image screen.

12. The touch screen of claim 1, wherein a corner block is disposed at the corner portion of the rectangular image screen, in which the optical module is not provided, so that the adjacent two linear infrared emitters are coupled at an angle of 90°

.

13. The touch screen of claim 12, wherein the infrared LED is disposed at the two surfaces of the corner block, to which the linear infrared emitter is coupled, so as to be used as a light source of the linear infrared emitter.

5. A touch screen which detects a touch position on an image screen displaying an image and executes a command corresponding to the touch position, comprising:

a linear infrared emitter which comprises a resin rod having a transparent circular shape in section and an infrared diffuse reflection line in a length direction thereof, an infrared LED disposed at one end of the resin rod so as to emit infrared rays into the resin rod and a reflecting surface which is formed at the other end of the resin rod so as to reflect the infrared rays, and which is independently disposed at least three sides of frame of a rectangular image screen so as to emit the infrared rays;

an optical module which is disposed at least two or more corner portions so as to monitor the entire image screen;

a control board which analyzes an infrared signal detected by the optical module and detects the touch position touched by a user.

6. The touch screen of claim 5, wherein at least two linear infrared emitters are provided at each side of the frame to be arranged in a row.

7. The touch screen of claim 5, wherein the linear infrared emitter is independently disposed at all of the four sides of the frame of the rectangular image screen, and the optical module is disposed at least three corner portions of the rectangular image screen.

8. The touch screen of claim 5, wherein a corner block is disposed at the corner portion of the rectangular image screen, in which the optical module is not provided, so that the adjacent two linear infrared emitters are coupled at an angle of 90°

.

9. The touch screen of claim 8, wherein the infrared LED is disposed at the two surfaces of the corner block, to which the linear infrared emitter is coupled, so as to be used as a light source of the linear infrared emitter.