Energy saving OLED lighting system and method

• US 9,380,675 B2
• Filed: 04/09/2015
• Issued: 06/28/2016
• Est. Priority Date: 04/17/2014
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Hack, Michael, Krall, Emory, Ma, Ruiqing
• Primary Examiner(s): LE, DON P
• Application Number:
  US14/682,551
• Publication Number:
  US 20150305114A1
• Time in Patent Office: 446 Days
• Field of Search: 315/294, 315/297, 315/158, 315/161
• US Class Current: 1/1
• 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: H05B 47/115 by determining the presence or movement of objects or living beings
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

Described herein are systems, devices, and methods related to adjusting the intensity of specific wavelengths in an illumination panel based on the presence of a person near the panel. By reducing some emitted wavelengths, such as wavelengths associated with blue light, when such wavelengths are not needed or desired, the lifetime and/or efficiency of the lighting panel can be increased. The systems, devices, and methods can be used to reduce energy costs and also to delay the aging of lighting panels.

Claims

1. A system for modulating the color output of a light emitting device, comprising:

at least one light emitting device having at least two individually controllable wavelengths;

at least one sensor for detecting the presence of a subject in a designated space; and

a controller communicatively connected to the at least one sensor and the at least one light emitting device,

wherein the controller directs the at least one light emitting device to change the color output of emitted light when the at least one sensor detects the presence of a subject in the designated space, and

wherein when a subject is not detected in the designated space the emission of the controllable wavelength with the shortest lifetime or the lowest efficiency is reduced.

2. The system of claim 1, wherein the at least one light emitting device is an OLED device.

3. The system of claim 1, wherein the at least one light emitting device comprises at least one lighting panel.

4. The system of claim 3, wherein each lighting panel is individually controlled.

5. The system of claim 3, wherein each lighting panel comprises a blue light emitting region and a yellow light emitting region.

6. The system of claim 5, wherein the yellow light emitting region comprises a red light emitting region and a green light emitting region.

7. The system of claim 5, wherein the controller directs the at least one light emitting device to reduce emittance of blue light when a subject is not detected by the at least one sensor.

8. The system of claim 1, wherein the at least one sensor is selected from the group consisting of a thermal sensor, a motion sensor, a pressure sensor, and a camera.

9. The system of claim 1, wherein the at least one light emitting device is configured to emit light in an area outside of the designated space.

10. The system of claim 1, wherein when a subject is not detected in the designated space the light color temperature of emitted light is less than about 2500 K, and when a subject is detected in the designated space the light color temperature of emitted light is greater than about 2700 K.

11. The system of claim 1, wherein when a subject is not detected in the designated space the luminance of the emitted light is reduced by at least 25% and the power consumption of the light emitting device is reduced by at least 40%.

12. The system of claim 5, wherein the blue and yellow light emitting regions are individually controlled within each lighting panel.

13. The system of claim 12, wherein the controller directs the at least one light emitting device to emit yellow light when a subject is not detected by the at least one sensor.

14. The system of claim 7, wherein the blue light emittance is reduced by at least 20%.

15. The system of claim 7, wherein the blue light emittance is reduced by at least 50%.

16. The system of claim 5, wherein the controller directs the at least one light emitting device to increase emittance of blue light when a subject is detected by the at least one sensor.

17. An OLED lighting device, comprising:

a lighting panel having at least two individually controllable wavelength emitting regions;

at least one sensor; and

a controller communicatively connected to the lighting panel and at least one sensor;

wherein the controller individually directs the output of light emitted from the at least one of the at least two individually controllable wavelength emitting regions of the lighting panel based on a signal received from the sensor;

wherein the signal received from the sensor is indicative of the presence or absence of a subject within a designated region, and

wherein when the signal indicates the absence of a subject within the designated region, the emission of the controllable wavelength with the shortest lifetime or the lowest efficiency is reduced.

18. A method for increasing the efficiency and lifetime of a light emitting device, comprising:

sensing the presence or absence of a subject within a designated area having a light emitting device with at least two individually controllable wavelengths;

directing the light emitting device to emit white light when a subject is present in the designated area; and

directing the light emitting device to prohibit or reduce emittance of at least one wavelength of light when a subject is absent from the designated area,

wherein the at least one wavelength prohibited or reduced when a subject is absent from the designated area is the wavelength with the shortest emission lifetime or the lowest emission efficiency.

19. The method of claim 18, wherein when a subject is not detected in the designated space the light color temperature of emitted light is less than about 2500 K, and when a subject is detected in the designated space the light color temperature of emitted light is greater than about 2700 K.

20. The method of claim 18, wherein when a subject is not detected in the designated space the luminance of the emitted light is reduced by at least 25% and the power consumption of the light emitting device is reduced by at least 40%.