TOUCH PANEL INTEGRATED DISPLAY DEVICE

• US 20110298756A1
• Filed: 06/02/2011
• Published: 12/08/2011
• Est. Priority Date: 06/03/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: SONG, Moon-Bong, KIM, Sung-Chul
• Granted Patent: US 8,933,911 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• 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 integrated display device which can reduce an entire thickness and weight and which can prevent display quality deterioration is discussed. The touch panel integrated display device includes a display panel comprising a plurality of pixels, to display an image; a touch panel formed on an top peripheral area of the display panel, to sense a touch generated on the display panel.

Claims

1. A touch panel integrated display device comprising:

a display panel comprising a plurality of pixels, to display an image; and

a touch panel formed on a top peripheral area of the display panel, to sense a touch generated on the display panel,

wherein the touch panel comprises,

a plurality of light sources comprising at least one light source arranged at each edge of the top peripheral area of the display panel, to emit lights toward the top surface of the display panel;

a plurality of sensors arranged at each edge of the top peripheral area of the display panel, spaced apart from each other with an identical distance, to collect the lights having passed over the top surface of the display panel after emitted from the plurality of the light sources;

a waveguide comprising a plurality of cores connected with the plurality of the sensors and a cladding formed to surround the plurality of the cores, with a lower refractive index than the plurality of the cores; and

a sensor controller connected with the plurality of the sensors via the plurality of the cores, to sense whether each of the sensors senses collects to calculate a coordinate of the touch.

2. The touch panel integrated display device of claim 1, wherein the plurality of the light sources are a plurality of light-emitting elements which emit lights with a wavelength range corresponding to an ultraviolet ray or an infrared ray.

3. The touch panel integrated display device of claim 1, wherein the top surface of the display panel is divided into a plurality of radiation intensity effective regions corresponding to the plurality of the light sources, respectively;

and

the lights collected by at least one sensor arranged in a single radiation intensity effective region corresponding to one of the light sources, after emitted from the single light sources, has a predetermined radiation intensity which can be sensed by the sensor controller effectively.

4. The touch panel integrated display device of claim 3, wherein the plurality of the sensors are curved toward the light sources corresponding to the radiation intensity effective regions, respectively, to be arranged in a concave lens shape.

5. The touch panel integrated display device of claim 1, wherein the plurality of the sensors are arranged at each edge of a top peripheral area of the display panel in at least one row.

6. The touch panel integrated display device of claim 1, wherein the plurality of the sensors area arranged at each edge of the top peripheral area of the display panel in at least rows in zigzag.

7. The touch panel integrated display device of claim 1, wherein the lights are arranged in an upper portion at each edge of the top peripheral area of the display panel, than the sensors.

8. The touch panel integrated display device of claim 1, wherein the display panel is a liquid crystal panel comprising transistor array and color filter array substrates bonded oppositely with each other and a liquid crystal layer filled between the transistor array substrate and the color filter array substrate;

and

wherein the transistor array substrate comprises,

a second substrate in opposite to the first substrate;

a plurality of data lines and a plurality of gate lines crossed with each other on the second substrate, to define a plurality of pixel regions corresponding to the plurality of the pixels;

a plurality of thin film transistors formed at intersections between the gate lines and the data lines, respectively; and

a plurality of pixel electrodes formed at the plurality of the pixel regions on the second substrate, to be connected with the plurality of the thin film transistors, respectively; and

wherein the color filter array substrate comprises,

a color filter array part formed on a back surface of the first substrate in opposite to a surface having the touch panel formed thereon.

9. The touch panel integrated display device of claim 8, wherein the color filter array part comprises,

a black matrix layer formed in an outer area of the pixel regions formed on the back surface of the first substrate, to block the light leakage in the outer area of the pixel regions;

a color filter layer formed in the pixel regions formed on the back surface of the first substrate, to transmit lights with a wavelength range corresponding to the pixels; and

an overcoat layer formed flat on the color filter layer.

10. The touch panel integrated display device of claim 8, wherein the liquid crystal panel comprises,

a backlight unit formed under the transistor array substrate to emit lights to the liquid crystal layer;

a first polarization layer formed on a back surface of the second substrate to polarize the lights emitted from the backlight unit; and

a second polarization layer formed on a top surface of the first substrate to polarize lights passing through the liquid crystal layer.