Touch panel and display apparatus having the same

• US 8,907,925 B2
• Filed: 05/25/2011
• Issued: 12/09/2014
• Est. Priority Date: 12/14/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Wonbae, Lee, Soobeom, Byeon, Myungsuk, Lee, Yonghan
• Primary Examiner(s): Haley, Joseph
• Assistant Examiner(s): FRANK, EMILY J
• Application Number:
  US13/115,324
• Publication Number:
  US 20120146950A1
• Time in Patent Office: 1,294 Days
• Field of Search: None
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• 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

Provided are a touch panel and a display apparatus having the touch panel. The touch panel includes a substrate, and a plurality of optical devices arranged on the substrate, in which a distance between two adjacent optical devices of the plurality of optical devices may gradually decrease toward a corner of the substrate.

Claims

1. A touch panel comprising:

a substrate; and

a plurality of optical devices arranged on a flange of the substrate,

wherein the optical devices comprise a plurality of light emitting devices for emitting light and a plurality of light receiving devices for receiving the light emitted by the plurality of light emitting devices,

wherein the substrate comprises a first side, a second side opposite to the first side, a third side adjacent to the first and second sides, and a fourth side opposite to the third side and adjacent to the first and second sides,

wherein the plurality of light emitting devices are arranged on a flange of each of the first, second, third and fourth sides of the substrate,

wherein the plurality of light receiving devices are arranged on the flange of each of the first, second, third and fourth sides of the substrate,

wherein a first gap between a first light emitting element and a first light receiving element is smaller than a second gap between the first light receiving element and a second light receiving element,

wherein the first light emitting element, the first light receiving element and the second light receiving element are serially disposed in at least one of the first side, the second side, the third side or the fourth side,

wherein a gap between adjacent two of light receiving elements are uniform in size in at least one of the first side, the second side, the third side or the fourth side, and

wherein the plurality of light receiving elements are disposed between adjacent two of light emitting elements.

2. The touch panel of claim 1, wherein a gap between two adjacent light receiving devices is less than a gap between two adjacent light receiving devices.

3. The touch panel of claim 1, wherein a number of the plurality of light receiving devices is greater than a number of the plurality of light emitting devices.

4. The touch panel of claim 1, wherein at least one of the optical devices is arranged at the corner of the substrate.

5. A display apparatus comprising:

a display panel; and

a plurality of optical devices arranged around an edge of the display panel,

wherein the optical devices comprise a plurality of light emitting devices for emitting light and a plurality of light receiving devices for receiving the light emitted by the plurality of light emitting devices,

wherein the substrate comprises a first side, a second side opposite to the first side, a third side adjacent to the first and second sides, and a fourth side opposite to the third side and adjacent to the first and second sides,

wherein the plurality of light emitting devices are arranged on a flange of each of the first, second, third and fourth sides of the substrate,

wherein the plurality of light receiving devices are arranged on the flange of each of the first, second, third and fourth sides of the substrate,

wherein a first gap between a first light emitting element and a first corner of the substrate is less than a second gap between a second light emitting element and the first corner of the substrate, and

wherein a radiation angle of the first light emitting element is greater than a radiation angle of the second light emitting element.

6. The display apparatus of claim 5, wherein the display panel comprises an active area on which an image is displayed and a dummy area arranged outside the active area;

and

the plurality of optical devices are arranged in the dummy area of the display panel.

7. The display apparatus of claim 5, wherein at least one of the optical devices is arranged at the corner of the substrate.

8. The display apparatus of claim 5,

wherein a direction to which a light emitting surface of at least one of the light emitting devices, arranged next each other, directs is different from a direction to which a light emitting surface of at least one of other light emitting devices.

9. The display apparatus of claim 5, wherein a number of the light receiving devices is greater than a number of the light emitting devices.