Organic light-emitting diode apparatus

• US 9,741,956 B2
• Filed: 09/25/2015
• Issued: 08/22/2017
• Est. Priority Date: 11/25/2014
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Tsai, Cheng-Yen, Lai, Chih-Ming, Yeh, Wen-Yung, Lin, Hsuan-Yu
• Primary Examiner(s): Lee, Nicholas
• Assistant Examiner(s): Adediran, Abdul-Samad A
• Application Number:
  US14/864,910
• Publication Number:
  US 20160148560A1
• Time in Patent Office: 697 Days
• Field of Search: 257 40, 315185 R, 315192, 345 76, 345207, 348 43, 349 69, 428704
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/13 comprising photosensors that control luminance

Abstract

An organic light-emitting diode (OLED) apparatus includes at least one OLED illumination module, a driving unit, an optical sensing module, a control unit, and a storage unit. The driving unit is configured to adjust voltage applied to the OLED illumination module, so as to change a CCT of the OLED illumination module. The optical sensing module is configured to sense the light emitted by the OLED illumination module. The control unit is configured to receive a feedback signal from the optical sensing module so as to adjust a light intensity and the CCT of the OLED illumination module. The storage unit is configured to store photoelectric parameter data of the OLED illumination module. The control unit is configured to adjust the CCT and the light intensity of the OLED illumination module to target values according to the photoelectric parameter data.

Claims

1. An organic light-emitting diode (OLED) apparatus, comprising:

at least one OLED illumination module;

a driver, electrically connected to the OLED illumination module and configured to adjust voltage applied to the OLED illumination module, so as to change a correlated color temperature (CCT) of light emitted by the OLED illumination module;

an optical sensor, configured to sense the light emitted by the OLED illumination module;

a controller, configured to receive a feedback signal from then optical sensor so as to adjust a light intensity and the CCT of the OLED illumination module, wherein the light intensity and the CCT of the OLED illumination module is adjusted by adjusting the voltage and a duty cycle of a pulse wavelength modulation (PWM) to the OLED illumination module; and

a storage, configured to store photoelectric parameter data of the OLED illumination module, the controller is configured to adjust the CCT and the light intensity of the OLED illumination module to target values according to the photoelectric parameter data, the photoelectric parameter data includes a relationship between at least two of voltage applied to the OLED illumination module, the CCT of the OLED illumination module, current applied to the OLED illumination module, and the light intensity of the OLED illumination module, wherein the photoelectric parameter data comprises a relationship at two end points of the voltage applied to the OLED illumination module or comprises a relationship in a table form having three or more voltages applied to the OLED illumination module.

2. The OLED apparatus as recited in claim 1, wherein the storage is integrated in the controller.

3. The OLED apparatus as recited in claim 1 further comprising an input and output interface device electrically connected or wirelessly connected to the controller, wherein the storage is integrated in the input and output interface device, and the input and output interface device comprises a computer or a portable computing device.

4. The OLED apparatus as recited in claim 1, wherein the controller is configured to calculate target values by interpolation based on a relationship.

5. The OLED apparatus as recited in claim 1, wherein the organic OLED illumination module comprises:

a first electrode;

a second electrode; and

an OLED layer stack, disposed between the first electrode and the second electrode, and comprising a first emitting layer and at least one of a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer and a blocking layer, wherein the OLED layer stack has an electro-optic characteristic, such that when a voltage difference between the first electrode and the second electrode is increased or decreased, both a light intensity and a correlated color temperature (CCT) of light emitted by the OLED layer stack are varied.

6. The OLED apparatus as recited in claim 5, wherein the first emitting layer is a white emitting layer, and the OLED layer stack comprises the hole transport layer capable of emitting light or the electron transport layer capable of emitting light, disposed at a side of the first emitting layer, so as to emit light having a main wavelength ranging from blue band to green band.

7. The OLED apparatus as recited in claim 6, wherein when the OLED layer stack comprises the hole transport layer capable of emitting light, a hole barrier between the hole transport layer capable of emitting light and the first emitting layer is less than 0.3 eV.

8. The OLED apparatus as recited in claim 6, wherein when the OLED layer stack comprises the electron transport layer capable of emitting light, an electron barrier between the electron transport layer capable of emitting light and the first emitting layer is less than 0.3 eV.

9. The OLED apparatus as recited in claim 5, wherein the first emitting layer is a white emitting layer, and the OLED layer stack further comprise a second emitting layer disposed at a side of the first emitting layer and is configured to emit light having a main wavelength ranging from blue band to green band.

10. The OLED apparatus as recited in claim 9, wherein the OLED layer stack comprises the hole transport layer and the electron transport layer, the first emitting layer and the second emitting layer are disposed between the hole transport layer and the electron transport layer, the first emitting layer comprises an emitting sub-layer for emitting blue light, the second emitting layer emits blue light, and a least driving voltage for the second emitting layer to emit light is higher than a least driving voltage for the emitting sub-layer for emitting blue light to emit the blue light by at least 0.5 volts.

11. The OLED apparatus as recited in claim 10, wherein the second emitting layer has an electron vibronic emission characteristic, and a light emission spectrum thereof has two peaks ranging from 450 nm to 475 nm and from 475 nm to 500 nm, respectively.

12. The OLED apparatus as recited in claim 5, further comprising

another OLED layer stack, disposed between the first electrode and the second electrode, and comprising a second emitting layer and at least one of a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer and a blocking layer, wherein the first emitting layer emits white light, and the second emitting layer emits light having a main wavelength ranging from blue band to green band or emits light having a main wavelength ranging from red band to yellow band;

and

a charge generation layer, connected to the OLED layer stack and the another OLED layer stack.

13. The OLED apparatus as recited in claim 12, wherein a least driving voltage for the second emitting layer to emit light is greater than a least driving voltage for the first emitting layer to emit light by at least 0.5 volts.

14. The OLED apparatus as recited in claim 1, wherein the OLED illumination module comprises:

a first electrode;

a second electrode; and

an OLED layer stack, disposed between the first electrode and the second electrode, wherein the OLED layer stack comprising a first emitting layer and a blocking layer, the blocking layer being disposed at a first side of the first emitting layer, the OLED layer stack further comprising a second emitting layer, a hole transport layer capable of emitting light or an electron transport layer capable of emitting light disposed at a second side of the first emitting layer, wherein the first side is opposite to the second side, and a thickness of the first emitting layer ranges from 20 nm to 45 nm.

15. The OLED apparatus as recited in claim 14, wherein the first emitting layer is a white emitting layer.

16. The OLED apparatus as recited in claim 14, wherein when the OLED layer stack comprises the hole transport layer capable of emitting light, a hole barrier between the hole transport layer capable of emitting light and the first emitting layer is less than 0.3 eV.

17. The OLED apparatus as recited in claim 14, wherein when the OLED layer stack comprises the electron transport layer capable of emitting light, an electron barrier between the electron transport layer capable of emitting light and the first emitting layer is less than 0.3 eV.

18. The OLED apparatus as recited in claim 14, wherein the hole transport layer capable of emitting light or the electron transport layer capable of emitting light is doped with a dopant capable of emitting blue light, green light or a combination thereof.

19. The OLED apparatus as recited in claim 14, wherein the first emitting layer is a white emitting layer, and the OLED layer stack further comprise the second emitting layer for emitting light having a main wavelength ranging from blue band to green band.

20. The OLED apparatus as recited in claim 19, wherein the OLED layer stack further comprises the hole transport layer and the electron transport layer, the first emitting layer and the second emitting layer are disposed between the hole transport layer and the electron transport layer, the first emitting layer comprises an emitting sub-layer for emitting blue light, the second emitting layer emits blue light, and a least driving voltage for the second emitting layer to emit light is higher than a least driving voltage for the emitting sub-layer for emitting blue light to emit the blue light by at least 0.5 volts.

21. The OLED apparatus as recited in claim 20, wherein the second emitting layer has an electron vibronic emission characteristic, and a light emission spectrum thereof has two peaks ranging from 450 nm to 475 nm and from 475 nm to 500 nm, respectively.