ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE

• US 20140353636A1
• Filed: 05/20/2014
• Published: 12/04/2014
• Est. Priority Date: 06/03/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: BAEK, Jong-In, PARK, Won Sang
• Granted Patent: US 9,543,363 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: A61N 2005/0653 Organic light emitting diodes
• CPC Class Codes: A61N 5/0618 Psychological treatment
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/88 Dummy elements, i.e. elements having non-functional features

Abstract

A display device includes a first pixel and a second pixel. The second pixel is controlled to emit light in a predetermined range in a first time period and to not emit light in the predetermined range in a second time period during which the first pixel emits light. The first pixel includes a first organic emission layer having a first thickness and the second pixel includes a second organic emission layer having a second thickness different from the first thickness. A resonance pattern is formed in the second pixel to emit light in a melatonin production inhibition wavelength range that corresponds to the predetermined range. The first pixel may emit blue light, green light, red light, or another color of light including white light.

Claims

1. An organic light emitting diode (OLED) display device, comprising:

a substrate; and

three color pixels and a melatonin control pixel on the substrate, wherein the melatonin control pixel emits or blocks light in a melatonin production inhibition wavelength range.

2. The display device as claimed in claim 1, wherein the melatonin production inhibition wavelength range includes about 414 nm to about 514 nm.

3. The display device as claimed in claim 2, wherein light emitted from the melatonin control pixel has a peak in the melatonin production inhibition wavelength range, and has a full width at half maximum of greater than 1 nm and less than 50 nm.

4. The display device as claimed in claim 1, wherein each of the three color pixels and the melatonin control pixel includes:

thin film transistors on the substrate;

a first electrode connected to the thin film transistors;

an organic emission layer on the first electrode; and

a second electrode on the organic emission layer.

5. The display device as claimed in claim 4, wherein a thickness of the organic emission layer of one or more of the three color pixels is different from a thickness of the organic emission layer of the melatonin control pixel.

6. The display device as claimed in claim 4, wherein the organic emission layer of the melatonin control pixel is configured to emit the light in the melatonin production inhibition wavelength range.

7. The display device as claimed in claim 1, wherein the three color pixels are a red pixel, a green pixel, and a blue pixel.

8. A display device, comprising:

a signal line; and

a first pixel connected to the signal line,

wherein the first pixel is to emit light in a predetermined range during a first time period and is not to emit light in the predetermined range during a second time period during which an image is displayed, wherein the second time period does not overlap the first time period, and wherein the predetermined range is a melatonin production inhibition wavelength range.

9. The display device as claimed in claim 8, wherein:

the first pixel is configured to receive a control signal from the signal line, and

the second pixel is to emit or is not to emit light in the predetermined range based on the control signal.

10. The display device as claimed in claim 8, wherein:

the first time period is daytime, and

the second time period is nighttime.

11. The display device as claimed claim 8, further comprising:

a plurality of second pixels to emit different colors of light during the first and second time periods.

12. The display device as claimed in claim 11, wherein the light emitted from the first pixel has a peak in the melatonin production inhibition wavelength range, and has a full width at half maximum of greater than 1 nm and less than 50 nm.

13. The display device as claimed in claim 11, wherein a sum of light from the first pixel and light from at least one of the second pixels combine to increase inhibition of production of melatonin during the first time period.

14. The display device as claimed in claim 11, wherein at least one of the second pixels is a blue pixel.

15. A display device, comprising:

a first pixel to emit light; and

a second pixel to emit light in a predetermined range in a first time period and to not emit light in the predetermined range in a second time period during which the first pixel emits light, wherein the first pixel includes a first organic emission layer having a first thickness and the second pixel includes a second organic emission layer having a second thickness different from the first thickness, and wherein a resonance pattern is formed in the second pixel to emit light in a melatonin production inhibition wavelength range that corresponds to the predetermined range.

16. The display device as claimed in claim 15, wherein:

the first time period is daytime, and

the second time period is nighttime.

17. The display device as claimed in claim 15, wherein the first pixel is to emit blue light.

18. The display device as claimed in claim 15, wherein the first pixel emits light when the second pixel does not emit light in the predetermined range.

19. The display device as claimed in claim 15, wherein the light emitted from the first pixel has a peak in the melatonin production inhibition wavelength range, and has a full width at half maximum of greater than 1 nm and less than 50 nm.

20. The display device as claimed in claim 15, wherein a sum of light from the first pixel and light from the second pixel combines to increase inhibition of production of melatonin in during the first time period.