Touch panel display device

• US 20090141002A1
• Filed: 09/26/2008
• Published: 06/04/2009
• Est. Priority Date: 12/03/2007
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Choi, Jong Seong, Lee, Sang Rae, Jang, Hyung Uk, Yu, Byung Chun, Sohn, Min Ho, Bae, Sang Hyuck
• Granted Patent: US 8,581,882 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 2203/11 involving infrared radiation
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A touch panel display device includes a liquid crystal panel to display an image by regulating transmittance of light supplied from a back light unit, and a touch sensing part provided on upper edges of the liquid crystal panel in order to detect a position touched by a user or an object. The touch sensing part includes infrared lamps to generate and emit infrared light, infrared light reflecting tubes mounted with the infrared lamps, and image sensors to sense the infrared light output from the light output regions of the infrared light reflecting tubes. Each of the infrared light reflecting tubes has light output regions and non-output regions evenly formed at a surface facing an upper surface of the liquid crystal panel so that the infrared light emitted from the infrared lamps is evenly irradiated on the upper surface of the liquid crystal panel.

Claims

1. A touch panel display device comprising:

a liquid crystal panel to display an image by transmittance of light supplied from a back light unit; and

a touch sensing part provided on upper edges of the liquid crystal panel in order to detect a position touched by a user or an object,

wherein the touch sensing part includes;

a plurality of infrared lamps to generate and emit infrared light;

infrared light reflecting tubes mounted with the infrared lamps, each of the infrared light reflecting tubes having a plurality of light output regions and a plurality of non-output regions formed at a surface facing an upper surface of the liquid crystal panel so that the infrared light emitted from the infrared lamps is irradiated on the upper surface of the liquid crystal panel; and

a plurality of image sensors to sense the infrared light emitted from the infrared lamps.

2. The touch panel display device according to claim 1, wherein each of the infrared light reflecting tubes is formed in a long rectangular parallelepiped shape.

3. The touch panel display device according to claim 1, wherein each of the light output regions formed at the surface of each of the infrared light reflecting tubes has a long rectangular shape extended in a vertical direction, or a square shape.

4. The touch panel display device according to claim 1, wherein the image sensors are disposed on the upper edges of the liquid crystal panel.

5. The touch panel display device according to claim 4, wherein the liquid crystal panel is formed in a rectangular shape including four sides,

and wherein the image sensors provided on the upper edges of the liquid crystal panel are positioned on any one of the four sides of the liquid crystal panel, or are positioned on corners at which the adjacent sides of the liquid crystal panel join.

6. The touch panel display device according to claim 1, further comprising:

at least one of the image sensors is disposed on a center portion of each of the upper edges of the liquid crystal panel.