Organic light-emitting diode panel and touch-screen system including the same

• US 8,890,850 B2
• Filed: 07/12/2007
• Issued: 11/18/2014
• Est. Priority Date: 12/26/2006
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Chung, In Jae, Ahn, In Ho, Baik, Seong Ho, Bae, Sang Hyuck
• Primary Examiner(s): HORNER, JONATHAN R
• Application Number:
  US11/826,148
• Publication Number:
  US 20080150848A1
• Time in Patent Office: 2,686 Days
• Field of Search: 345/156, 345/176, 345/177
• US Class Current: 345/176
• CPC Class Codes: G06F 2203/04109 FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
• 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 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 65/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element and at least one organic radiation-sensitive element, e.g. organic opto-couplers organic image sensors integrated with organic light-emitting devices H10K39/34; OLED displays integrated with photosensors H10K59/13

Abstract

A display device includes a waveguide with a light propagating therein, and a panel including a first organic light-emitting device in a sub-pixel region and a second organic light-emitting device in a sensing region adjacent to the sub-pixel region, the first organic light-emitting device for displaying a data on the panel, and the second light-emitting device responsive to a scattering of the light from the waveguide for outputting a signal indicative of a contact on the waveguide.

Claims

1. A display device, comprising:

a waveguide with a light propagating therein;

at least one light source located at edges of the waveguide to emit the light to the waveguide; and

a panel including a first organic light-emitting device in a sub-pixel region and a second organic light-emitting device in a sensing region adjacent to the sub-pixel region, the first organic light-emitting device for displaying a data on the panel, and the second organic light-emitting device responsive to a scattering of the light from the waveguide for outputting a signal indicative of a contact on the waveguide,

wherein the sub-pixel region includes a first switching transistor which is configured to receive a scan signal from a scan line and transmit a first data signal received from a data line, a first capacitor which is configured to store the first data signal, a first driving transistor which is configured to generate a driving current corresponding to a difference between the first data signal stored in the first capacitor and a reference voltage, and the first organic light emitting device having a first electrode connected to the reference voltage and a second electrode connected to a source voltage to emit light corresponding to the driving current,

wherein the sensing region includes a second switching transistor which is configured to receive the scan signal from the scan line and transmit a second data signal received from a data line, a second capacitor which is configured to store the second data signal, a second driving transistor which is configured to be turned on by the second data signal stored in the second capacitor, and the second organic light emitting device having a first electrode connected to the source voltage, and a second electrode connected to the reference voltage, and

wherein the first and second organic light-emitting devices are separated from each other and included in an array of organic light-emitting device disposed on a same plane.

2. The display device of claim 1, wherein the signal from the second organic light-emitting device includes a photo current.

3. The display device of claim 1, wherein the waveguide and a portion of the panel facing the waveguide have substantially the same refractive index.

4. The display device of claim 3, wherein the waveguide and the panel are separated from each other.

5. The display device of claim 1, further comprising a processor for calculating a location of the contact on the waveguide.

6. A touch screen system, comprising:

a waveguide with a light substantially totally reflected therein;

at least one light source located at edges of the waveguide to provide the light to the waveguide;

a panel coupled to the waveguide, the panel including a plurality of first organic light emitting devices in a plurality of sub-pixel regions, and a plurality of second organic light emitting devices in a plurality of sensing regions adjacent to corresponding respective ones of the sub-pixel regions, the plurality of the second organic light emitting devices responsive to light scattering from the waveguide for outputting leakage currents indicative of a plurality of contacts on the waveguide, wherein the plurality of first organic light emitting devices and the plurality of second organic light emitting devices are separated from each other and disposed in a same plane; and

a processor for calculating the locations of the contacts on the waveguide,

wherein each sub-pixel region includes a first switching transistor which is configured to receive a scan signal from a scan line and transmit a first data signal received from a data line, a first capacitor which is configured to store the first data signal, a first driving transistor which is configured to generate a driving current corresponding to a difference between the first data signal stored in the first capacitor and a reference voltage, and a respective one of the first organic light emitting devices having a first electrode connected to the reference voltage and a second electrode connected to a source voltage to emit light corresponding to the driving current, and

wherein each sensing region includes a second switching transistor which is configured to receive the scan signal from the scan line and transmit a second data signal received from a data line, a second capacitor which is configured to store the second data signal, a second driving transistor which is configured to be turned on by the second data signal stored in the second capacitor, and a respective one of the second organic light emitting devices having a first electrode connected to the source voltage, and a second electrode connected to the reference voltage.

7. The touch screen system of claim 6, wherein the waveguide and a portion of the panel facing the waveguide have substantially the same refractive index.

8. The touch screen system of claim 7, wherein the waveguide and the panel are separated from each other.

9. The touch screen system of claim 6, further comprising;

a readout integrated circuit connected to the second organic light emitting devices;

a converter converting a signal from the readout integrated circuit; and

a video signal processor processing the converted signal from the readout integrated circuit.