TOUCH DISPLAY

• US 20120262413A1
• Filed: 01/17/2012
• Published: 10/18/2012
• Est. Priority Date: 04/13/2011
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: E Ink Holdings Incorporated
• Inventors: HUANG, Hsin-Tao, Tsai, Chuang-Chuang
• Granted Patent: US 8,952,935 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G02F 1/133616 Front illuminating devices
• 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 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A touch display, including: a light source; a light guide plate, having a first refractive index and having a side face close to the light source; a cover layer, having a second refractive index and being placed over the light guide plate, and the second refractive index is smaller than the first refractive index; a plurality of pillar structures, having a third refractive index and being placed under the light guide plate, and the third refractive index is larger than or equal to the first refractive index; a touch structure, placed over the cover layer; and an electronic paper device, placed under the pillar structures.

Claims

1. A touch display, comprising:

a light source, being capable of emitting an incident light;

a light guide plate, having a side face and a bottom surface connected to said side face, wherein said light guide plate has a first refractive index and said side face neighbors said light source and receives said incident light;

a cover layer, having a second refractive index and being placed over said light guide plate, wherein said second refractive index is smaller than said first refractive index;

a plurality of pillar structures, having a third refractive index and being placed under said bottom surface of said light guide plate, wherein said third refractive index is larger than or equal to said first refractive index;

a touch structure, placed over said cover layer; and

an electronic paper device, placed under said pillar structures.

2. The touch display as claim 1, wherein said light source comprises a fluorescent lamp or a light emitting diode.

3. The touch display as claim 1, wherein said cover layer comprises a plurality of air gaps.

4. The touch display as claim 1, wherein each said pillar structure has a top face and a bottom face opposite to the top face, and the area of said top face is larger than that of said bottom face.

5. The touch display as claim 1, wherein each said pillar structure has a top face and a bottom face opposite to the top face, and the area of said top face is equal to that of said bottom face.

6. The touch display as claim 1, wherein each said pillar structure has a top face and a bottom face opposite to the top face, and the area of said top face is smaller than that of said bottom face.

7. The touch display as claim 1, wherein each said pillar structure is located a first distance from said light source, the area of said top face of each said pillar structure varies with said first distance, and said area becomes larger as said first distance increases.

8. The touch display as claim 7, wherein a gap is formed between two neighboring ones of said pillar structures and located a second distance from said light source, said gap varies with said second distance, and said gap becomes smaller as said second distance increases.

9. The touch display as claim 1, wherein said touch structure is of one type selected from the group consisting of resistive type, capacitive type, surface acoustic wave type, and force sensing type.

10. The touch display as claim 1, wherein said electronic paper device is adhered to said pillar structures by a glue material.

11. The touch display as claim 10, wherein said electronic paper device is a reflective type display device or a transflective type display device.

12. The touch display as claim 10, wherein said electronic paper device is one selected from the group consisting of electrophoresis display, MEMS (micro electro mechanical system) display, cholesteric liquid crystal display, electrowetting display, liquid crystal display, organic/inorganic electroluminescence display, and electrochromic display.