Display apparatus having enhanced center wavelength, method of controlling the display apparatus, and computer program for executing the method

Patent metadata

Field	Value
Publication number	US-10083646-B2
Application number	US-201615087137-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Sep 15, 2015
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

An display apparatus includes a plurality of pixels. Each of the plurality of pixels includes a first sub-pixel that emits light of a first color having a center wavelength from 390 nm to 450 nm and a second sub-pixel that emits light of a second color different from the first color.

First claim

What is claimed is:

1. A display apparatus comprising: a plurality of pixels, wherein each of the plurality of pixels comprises a first sub-pixel and a second sub-pixel, wherein the first sub-pixel includes a first organic light-emitting diode that has an optical path length within a range from 147 nm to 179 nm and emits light having a center wavelength in a range of from 390 nm to 450 nm, and wherein the second sub-pixel includes a second organic light-emitting diode that has an optical path length within a range from 236 nm to 288 nm and emits light having a center wavelength in a range from 520 nm to 590 nm.

2. A method of controlling display of a display apparatus, using a processor, the method comprising:
receiving RGB data including sub-pixel data regarding red, green, and blue sub-pixels;
modulating the RGB data to YB data including data regarding a first sub-pixel that emits light having a center wavelength in a range from 390 nm to 450 nm and data regarding a second sub-pixel that emits light having a center wavelength that is different front the center wavelength of the light of the first sub-pixel;
performing gamma correction on the YB data; and
outputting the gamma-corrected YB data.

3. A non-transitory computer readable recording medium having recorded thereon a computer program for implementing the method of claim 2 .

4. A display apparatus comprising:
a plurality of pixels, wherein each of the plurality of pixels comprises:
a first sub-pixel that emits light having a center wavelength in a range of from 390 nm to 450 nm; and
a second sub-pixel that emits light having a center wavelength that is different from that of the first sub-pixel.

5. The display apparatus of claim 4 , wherein the first sub-pixel further comprises:
a pixel electrode, which is arranged on a substrate including a thin-film transistor, is electrically connected to the thin-film transistor, and reflects at least some incident light;
an organic layer, which is arranged on the pixel electrode and comprises a light-emitting layer; and
a counter electrode, which is arranged on the organic layer and constitutes a resonance structure together with the pixel electrode by reflecting at least some light emitted by the light-emitting layer.

6. The display apparatus of claim 5 , wherein: light emitted by the light-emitting layer exits the display apparatus via the counter electrode, the pixel electrode comprises a reflective electrode, and the counter electrode comprises a semi-transparent layer that forms resonance together with the reflective electrode.

7. The display apparatus of claim 6 , wherein the semi-transparent layer comprises a semi-transparent metal layer that comprises Ag, Al, Mg, Li, Ca, Cu, LiF/Ca, LiF/Al, MgAg, CaAg.

8. The display apparatus of claim 6 , wherein the pixel electrode further comprises a transparent layer formed on the reflective electrode, and the transparent layer comprises indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In 2 O 3 ), indium gallium oxide (IGO), or aluminum zinc oxide (AZO).

9. The display apparatus of claim 6 , wherein, when a distance between the reflective electrode and the semi-transparent layer is referred to as an optical path length, the first sub-pixel is formed to have an optical path length corresponding to a center wavelength of 420 nm.

10. The display apparatus of claim 9 , wherein the optical path length of the first sub-pixel is within a range from 147 nm to 179 nm.

11. The display apparatus of claim 4 , wherein a center wavelength of the light emitted from the second sub-pixel is in a range from 520 nm to 590 nm.

12. The display apparatus of claim 11 , wherein the second sub-pixel further comprises:
a pixel electrode, which is arranged on a substrate including a thin-film transistor, is electrically connected to the thin-film transistor, and reflects at least some incident light;
an organic layer, which is arranged on the pixel electrode and comprises a light-emitting layer; and
a counter electrode, which is arranged on the organic layer and constitutes a resonance structure together with the pixel electrode by reflecting at least some light emitted by the light-emitting layer.

13. The display apparatus of claim 12 , wherein light emitted by the light-emitting layer exits the display apparatus via the counter electrode, the pixel electrode comprises a reflective electrode, and the counter electrode comprises a semi-transparent layer that forms resonance together with the reflective electrode.

14. The display apparatus of claim 13 , wherein, when a distance between the reflective electrode and the semi-transparent layer is referred to as an optical path length, the second sub-pixel is formed to have an optical path length corresponding to a center wavelength of 555 nm.

15. The display apparatus of claim 14 , wherein the optical path length of the second sub-pixel is within a range from 236 nm to 288 nm.

16. The display apparatus of claim 14 , wherein the optical path length is established by selecting a thickness of a hole injection layer (HIL) and a thickness of a hole transport layer (HTL).

17. The display apparatus of claim 4 , wherein a size of the first sub-pixel is larger than that a size of the second sub-pixel.

18. The display apparatus of claim 4 , wherein each of the plurality of pixels further comprises a third sub-pixel that emits white light.

19. The display apparatus of claim 4 , wherein a center wavelength of the light of the first sub-pixel is in a range from 405 nm to 435 nm.

20. The display apparatus of claim 4 , wherein a center wavelength of the light of the first sub-pixel is in a range from 415 nm to 425 nm.

21. The display apparatus of claim 4 , further comprising a display controller, which provides image data to be displayed on the organic light-emitting diode display apparatus, wherein the display controller comprises:
an RGB data receiver, which receives RGB data including sub-pixel data regarding red, green, and blue sub-pixels; a data modulator, which modulates the RGB data to YB data including data regarding the first sub-pixel and data regarding the second sub-pixel;
a data corrector, which performs gamma correction on the YB data; and
a data outputter, which outputs the gamma-corrected YB data.

22. The display apparatus of claim 21 , wherein the data modulator modulates the RGB data to YBW data including data regarding the first sub-pixel, data regarding the second sub-pixel, and data regarding a third sub-pixel that emits white light, the data corrector performs gamma correction on the YBW data, and the data outputter outputs the gamma-corrected YBW data.

23. The display apparatus of claim 21 , wherein a gamma value for determining characteristics of a gamma curve used for the gamma correction is greater than 2.2.

24. The display apparatus of claim 4 , comprises:
a substrate;
an organic light emitting unit, which is formed on the substrate and comprises the plurality of pixels; and
a sealing unit, which is formed on the substrate and seals the organic light emitting unit.

25. The display apparatus of claim 24 , wherein the sealing unit comprises a thin-film encapsulating layer, and the substrate and the sealing unit are flexible.

26. The display apparatus of claim 4 , wherein each of the plurality of pixels further comprises: a third sub-pixel that emits light having a center wave

Assignees

• Samsung Display Co Ltd

Inventors

• Mok Rangkyun
• Ahn Yijoon
• Chu Hyeyong

Classifications

• G09G2320/0276

  for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G3/2003 Primary

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title