ORGANIC LIGHT EMITTING DISPLAY HAVING TOUCH SCREEN FUNCTION

• US 20120105341A1
• Filed: 04/04/2011
• Published: 05/03/2012
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Chan-Young, Kang, Sung-Kee
• Granted Patent: US 8,462,130 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386

Abstract

An organic light emitting display having a touch screen function that includes a transparent substrate and a plurality of thin film transistors formed on the transparent substrate is disclosed. An anode electrode layer is formed above each of the plurality of thin film transistors to be connected to the thin film transistor. Red, green, blue and infrared light emitting layers are formed on adjacent anode electrode layers, respectively. A spacer is formed on the infrared light emitting layer, and the width of the spacer is widened as it approaches from the bottom to top of the spacer. A cathode electrode layer is stacked on the light emitting layers and the spacer. A sealing substrate is positioned above the cathode electrode layer. Accordingly, the organic light emitting display provides an image display function and a touch screen function at the same time.

Claims

1. An organic light emitting display having a touch screen function, the display comprising:

a transparent substrate;

a plurality of thin film transistors formed on the transparent substrate;

an anode electrode layer formed above each of the thin film transistors to be electrically connected to the thin film transistor;

red, green, blue and infrared light emitting layers formed on adjacent anode electrode layers, respectively;

a spacer formed on the infrared light emitting layer, wherein the width of the spacer is widened as it approaches from the bottom to top of the spacer;

a cathode electrode layer stacked on the light emitting layers and the spacer; and

a sealing substrate positioned above the cathode electrode layer.

2. The display according to claim 1, wherein a partial region of the infrared light emitting layer is exposed between the spacer and the cathode electrode layer.

3. The display according to claim 1, wherein each of the light emitting layers comprises a hole transfer layer, an electron transfer layer and an organic light emitting layer formed between the hole transfer layer and the electron transfer layer.

4. The display according to claim 3, wherein the organic light emitting layer of the infrared light emitting layer is formed of at least one selected from the group consisting of organic complexes with trivalent rare-earth ions, ethyne-bridged porphyrin oligomers embedded in a polymer, and Ir(III) complexes with extended systems, and platinum-porphyrin complexes.

5. The display according to claim 1, further comprising an infrared camera configured to photograph an outer surface of the sealing substrate.

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

a sensor substrate formed above the sealing substrate; and

a plurality of infrared sensors formed on an inner surface of the sensor substrate, substantially corresponding to the respective infrared light emitting layers.

7. The display according to claim 1, wherein the sealing substrate is substantially transparent.

8. The display according to claim 1, wherein each of the thin film transistors comprises:

a semiconductor layer formed on the transparent substrate;

a gate insulating layer formed on the semiconductor layer;

a gate electrode formed to be patterned on the gate insulating layer;

an interlayer insulating layer formed on the gate electrode and the gate insulating layer; and

source and drain electrodes formed on the interlayer insulating layer and electrically connected to the semiconductor layer through contact holes formed in the gate insulating layer and the interlayer insulating layer.

9. The display according to claim 8, wherein the anode electrode layer is electrically connected to the source or drain electrode.

10. The display according to claim 1, wherein the spacer is formed in the shape of a reverse trapezoid.