Patent ID: 8581882

Claim:
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; a plurality of additional infrared lamps provided at certain positions of the infrared light reflecting tubes, wherein the certain positions correspond to where the intensity of the infrared light emitted from the infrared lamps drops below a threshold by which the image sensors sense a user's or object's touch; wherein the plurality of light output regions and the plurality of non-output regions are formed along the length of the infrared light reflecting tubes; wherein the infrared light emitted from the infrared lamps is irradiated along the length of the infrared light reflecting tubes, and wherein the plurality of non-output regions are entirely made of a material reflecting infrared light; wherein the plurality of light output regions comprise a first light output regions poisoned at a first row of the infrared light reflecting tubes, second light output regions poisoned at a second row of the infrared light reflecting tubes and third light output regions poisoned at a third row of the infrared light reflecting tubes; wherein both a portion of one second light output region and a portion of the other second light output region are positioned between the corresponding first output region and third output region facing each other; wherein the one second output region is adjacent with the other second output region; wherein one first light output region positioned at the end of the infrared light reflecting tubes is smallest among the first output regions; wherein one third light output region positioned at the end of the infrared light reflecting tubes is smallest among the third output regions.