Light emitting display device

• US 20050083323A1
• Filed: 10/19/2004
• Published: 04/21/2005
• Est. Priority Date: 10/21/2003
• Status: Abandoned Application

• Current Assignee: Tohoku Pioneer Company Limited (Pioneer Corporation)
• Original Assignee: Tohoku Pioneer Company Limited (Pioneer Corporation)
• Inventors: Suzuki, Gen, Yazawa, Naoki
• Application Number:
  US10/967,271
• Publication Number:
  US 20050083323A1
• Time in Patent Office: Days
• US Class Current: 345/207
• CPC Class Codes: G09G 2300/026 Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/3216 using a passive matrix
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H05B 45/60 Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A light emitting display device 1 characterized by forming one display screen by combining a plurality of light emitting display units comprising intensity control means for measuring a light emission intensity by a light emitting element (organic EL element 20) which is formed above/on a transparent substrate 11 and which includes an anode electrode 12, a cathode electrode 16, at least one organic light emission functional layer (13,14,15) between the electrodes to control the light emission intensity of the light emitting element above/on the substrate 11 within a predetermined range and deterioration state reporting means for detecting a deterioration state of the light emitting element above/on the substrate 11 to report the state.

Claims

1. A light emitting display device characterized by forming one display screen by combining a plurality of light emitting display units comprising intensity control means for measuring a light emission intensity by a light emitting element which is formed above/on a transparent substrate and which includes an anode electrode, a cathode electrode, at least one organic light emission functional layer between the electrodes to control the light emission intensity of the light emitting element above/on the substrate within a predetermined range and deterioration state reporting means for detecting a deterioration state of the light emitting element above/on the substrate to report the state.

2. The light emitting display device according to claim 1, characterized in that the intensity control means is composed of photoelectric transfer means for receiving light which is from the light emitting element and which is reflected within the substrate, treating substrate surfaces of the transparent substrate or substrate surfaces of a light guide substrate arranged above/on the transparent substrate in a stacked state as boundary surfaces, to generate an electrical signal and driving power setting means for setting a light emission driving power supplied to the respective light emitting elements based on the electrical signal obtained by the photoelectric transfer means.

3. The light emitting display device according to claim 1, characterized in that the deterioration state reporting means is constructed in such a manner that the deterioration state is detected based on a voltage between terminals and/or a terminal current of the time when the light emitting element on the transparent substrate operates to emit light.

4. The light emitting display device according to claim 3 characterized by being constructed in such a manner that the deterioration state reporting means is provided with comparison means for comparing the voltage between terminals and/or the terminal current with a reference value to drive the reporting means based on a difference between comparison results obtained by the comparison means.

5. The light emitting display device according to any one of claims 1 to 4, characterized in that light emitting elements which emit a plurality of different light emission colors are formed above/on the transparent substrate which constitutes the light emitting display unit.

6. The light emitting display device according to any one of claims 1 to 4, characterized in that light emitting elements which emit a single light emission color are formed above/on the transparent substrate which constitutes the light emitting display unit.

7. The light emitting display device according to any one of claims 1 to 4, characterized in that sealing means for sealing the light emitting elements respectively formed above/on the transparent substrate between the transparent substrate and the sealing means is disposed in the light emitting display unit.

8. The light emitting display device according to claim 5, characterized in that sealing means for sealing the light emitting elements respectively formed above/on the transparent substrate between the transparent substrate and the sealing means is disposed in the light emitting display unit.

9. The light emitting display device according to claim 6, characterized in that sealing means for sealing the light emitting elements respectively formed above/on the transparent substrate between the transparent substrate and the sealing means is disposed in the light emitting display unit.

10. The light emitting display device according to any one of claims 2 to 4, characterized in that the light emitting element including an organic light emission functional layer formed above/on the transparent substrate which constitutes the light emitting display unit is utilized as a photodetector in the photoelectric transfer means.

11. The light emitting display device according to claim 5, characterized in that the light emitting element including an organic light emission functional layer formed above/on the transparent substrate which constitutes the light emitting display unit is utilized as a photodetector in the photoelectric transfer means.

12. The light emitting display device according to claim 6, characterized in that the light emitting element including an organic light emission functional layer formed above/on the transparent substrate which constitutes the light emitting display unit is utilized as a photodetector in the photoelectric transfer means.

13. The light emitting display device according to claim 7, characterized in that the light emitting element including an organic light emission functional layer formed above/on the transparent substrate which constitutes the light emitting display unit is utilized as a photodetector in the photoelectric transfer means.

14. The light emitting display device according to claim 8, characterized in that the light emitting element including an organic light emission functional layer formed above/on the transparent substrate which constitutes the light emitting display unit is utilized as a photodetector in the photoelectric transfer means.

15. The light emitting display device according to claim 9, characterized in that the light emitting element including an organic light emission functional layer formed above/on the transparent substrate which constitutes the light emitting display unit is utilized as a photodetector in the photoelectric transfer means.