Organic light emitting diode touch display

• US 8,674,964 B2
• Filed: 07/02/2010
• Issued: 03/18/2014
• Est. Priority Date: 07/02/2009
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Huang, Jung-yen, Cho, An-thung, Hsu, Shih-feng, Huang, Wei-pang, Peng, Chia-tien
• Primary Examiner(s): Amadiz, Rodney
• Application Number:
  US12/830,253
• Publication Number:
  US 20110043487A1
• Time in Patent Office: 1,355 Days
• Field of Search: 345 76- 83, 345173-183, 178 1801- 1811
• US Class Current: 345/175
• 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: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2360/14 Detecting light within display terminals, e.g. using a single or a plurality of photosensors
• CPC Class Codes: G09G 2360/142 the light being detected by light detection means within each pixel
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

An OLED display is proposed. The OLED display includes a gate driver for generating a scanning signal, a source driver for generating a data signal, and a plurality of cells arranged in an array. Each cell includes a first transistor for delivering the data signal when receiving the scanning signal, a second transistor for generating a driving current based on a voltage difference between a first supply voltage signal and the data signal, a storage capacitor coupled between the first transistor and an output end of the driving circuit, for storing the data signal, an organic light emitting diode for generating light based on the driving current, an infrared emitting layer for producing infrared ray, and an infrared sensitive layer for sensing the infrared ray reflected by an object.

Claims

1. An organic light emitting diode display, comprising:

a gate driver for providing a plurality of scanning signals;

a source driver for providing a plurality of data signals;

a plurality of pixel units arranged in an array, each pixel unit comprising;

a first transistor for delivering the data signal when receiving the scanning signal;

a driving circuit coupled to the first transistor for generating a driving current based on a voltage difference between a first supply voltage signal and the data signal;

a storage capacitor coupled to the driving circuit, for storing the data signal;

an organic light emitting diode for generating light based on the driving current;

a plurality of infrared units, each infrared unit comprising;

an infrared emitting region for producing infrared ray in response to the first supply voltage signal, comprising;

a power-electrode metallic layer for conducting the first supply voltage signal;

a display anode disposed on the power-electrode metallic layer;

an infrared emitting layer disposed on the display anode; and

a cathode metal layer disposed over the infrared emitting layer; and

an infrared sensitive region for sensing the infrared ray reflected by an object.

2. The organic light emitting diode display as claimed in claim 1 further comprising a processing unit for determining a position which the object contacts the pixel units based on the infrared ray sensed by the infrared sensitive region.

3. The organic light emitting diode display as claimed in claim 1 further comprising a detection unit for enabling the first supply voltage signal when brightness of ambient light is lower than a threshold.

4. The organic light emitting diode display as claimed in claim 1, wherein the infrared emitting layer is made of a material of organic light emitting diode.

5. The organic light emitting diode display as claimed in claim 1, wherein the driving circuit comprises:

a second transistor coupled to the storage capacitor for delivering a compensating voltage to the storage capacitor in response to a first enabling signal;

a third transistor coupled to the second transistor and the storage capacitor, and controlled by a second enabling signal;

a fourth transistor coupled to the storage capacitor and controlled by a third enabling signal;

a fifth transistor coupled to the second transistor and the fourth transistor; and

a sixth transistor coupled to the fifth transistor and the organic light emitting diode, and controlled by the third enabling signal.

6. The organic light emitting diode display as claimed in claim 5, wherein the first enabling signal is triggered prior to the second enabling signal, and the second enabling signal is triggered prior to the third enabling signal.

7. The organic light emitting diode display as claimed in claim 5, wherein the storage capacitor is coupled between the first supply voltage signal and the second transistor.

8. The organic light emitting diode display as claimed in claim 1, wherein the infrared sensitive region includes a silicon rich sensor, a P-I-N sensor, or an a-Si TFT sensor.

9. The organic light emitting diode display as claimed in claim 1, wherein the infrared sensitive region comprising:

a second transistor;

an anode disposed on the second transistor;

an organic layer disposed on the anode; and

a cathode metal layer disposed over the organic layer.

10. An organic light emitting diode display panel for use in a display, comprising:

a substrate having a display region;

a plurality of pixel units arranged on the display region of the substrate, each pixel unit comprising;

a first transistor for delivering a data signal when receiving a scanning signal;

a driving circuit for generating a driving current based on a voltage difference between a first supply voltage signal and the data signal;

a storage capacitor coupled between the first transistor and the driving circuit for storing the data signal; and

an organic light emitting diode for generating light based on the driving current; and

an infrared unit arranged on the display region of the substrate, comprising;

an infrared emitting layer for producing infrared ray; and

an infrared sensitive layer for sensing the infrared ray reflected by an object, comprising;

a second transistor;

an anode disposed on the second transistor;

an organic layer disposed on the anode; and

a cathode metal layer disposed over the organic layer.

11. The organic light emitting diode display panel as claimed in claim 10, wherein at least six pixel units are arranged with the infrared unit.

12. The organic light emitting diode display panel as claimed in claim 10, wherein the infrared emitting layer is made of a material of the organic light emitting diode.

13. The organic light emitting diode display panel as claimed in claim 10, wherein the infrared emitting layer is used for generating the infrared ray in response to the first supply voltage signal.

14. The organic light emitting diode display panel as claimed in claim 13 wherein the first supply voltage signal enables when brightness of ambient light of the display is lower than a threshold.

15. The organic light emitting diode display panel as claimed in claim 10, wherein the driving circuit comprises:

a second transistor coupled to the storage capacitor for delivering a compensating voltage to the storage capacitor in response to a first enabling signal;

a third transistor coupled to the second transistor and the storage capacitor, and controlled by a second enabling signal;

a fourth transistor coupled to the storage capacitor and controlled by a third enabling signal;

a fifth transistor coupled to the second transistor and the fourth transistor; and

a sixth transistor coupled to the fifth transistor and the organic light emitting diode, and controlled by the third enabling signal.

16. The organic light emitting diode display panel as claimed in claim 15, wherein the first enabling signal is triggered prior to the second enabling signal, and the second enabling signal is triggered prior to the third enabling signal.

17. The organic light emitting diode display panel as claimed in claim 15, wherein the storage capacitor is coupled between the first supply voltage signal and the second transistor.

18. The organic light emitting diode display panel as claimed in claim 10, wherein the infrared sensitive region includes a silicon rich sensor, a P-I-N sensor, or an a-Si TFT sensor.