Display device

Abstract

A display device can include an organic light emitting diode disposed in a first pixel configured to emit a first color light, a second pixel configured to emit a second color light, and a third pixel configured to emit a third color light, in which the organic light emitting diode emits the third color light; a first color-conversion layer disposed on the organic light emitting diode in the first pixel; and a second color-conversion layer disposed on the organic light emitting diode in the second pixel, in which the first color light and the second color light have a longer wavelength than the third color light.

What is claimed is: 
     
       1. A display device, comprising:
 an organic light emitting diode disposed in a first pixel configured to emit a first color light, a second pixel configured to emit a second color light, and a third pixel configured to emit a third color light, wherein the organic light emitting diode emits the third color light; 
 a first color-conversion layer disposed on the organic light emitting diode in the first pixel; 
 a second color-conversion layer disposed on the organic light emitting diode in the second pixel; 
 a black matrix disposed between the first, second and third pixels; and 
 a light scattering layer disposed only on the organic light emitting diode in the third pixel, 
 wherein a lateral surface of the light scattering layer is in contact with the black matrix, and 
 wherein the first color light and the second color light have a longer wavelength than the third color light. 
 
     
     
       2. The display device according to  claim 1 , wherein the organic light emitting diode comprises a light emission layer that is disposed continuously across the first, second and third pixels, and emits blue monochromatic light as the third color light. 
     
     
       3. The display device according to  claim 1 , wherein the first color-conversion layer converts the third color light into the first color light, and
 wherein the second color-conversion layer converts the third color light into the second color light. 
 
     
     
       4. The display device according to  claim 3 , wherein the first color-conversion layer includes red quantum dots and the second color-conversion layer includes green quantum dots. 
     
     
       5. The display device according to  claim 1 , further comprising:
 a first auxiliary color filter disposed between the first color-conversion layer and the organic light emitting diode in the first pixel, wherein the first auxiliary color filter is configured to transmit the third color light; and 
 a second auxiliary color filter disposed between the second color-conversion layer and the organic light emitting diode in the second pixel, wherein the second auxiliary color filter is configured to transmit the third color light. 
 
     
     
       6. The display device according to  claim 5 , wherein each of the first and second auxiliary color filters is a blue color filter. 
     
     
       7. The display device according to  claim 1 , further comprising:
 a third color filter disposed on the first color-conversion layer in the first pixel, wherein the third color filter is configured to transmit the first color light received from the first color-conversion layer. 
 
     
     
       8. The display device according to  claim 7 , wherein a top surface of the light scattering layer is in contact with the third color filter. 
     
     
       9. The display device according to  claim 1 , further comprising:
 a fourth color filter disposed on the second color-conversion layer in the second pixel, wherein the fourth color filter is configured to transmit the second color light received from the second color-conversion layer. 
 
     
     
       10. The display device according to  claim 1 , further comprising:
 a fifth color filter disposed on the organic light emitting diode in the third pixel, wherein the fifth color filter is configured to transmit the third color light received from the organic light emitting diode. 
 
     
     
       11. The display device according to  claim 1 , wherein the organic light emitting diode has a n stack structure emitting a blue light, where n is a natural number greater than or equal to 2. 
     
     
       12. The display device according to  claim 1 , wherein the light scattering layer is configured to convert anisotropic light into isotropic light. 
     
     
       13. The display device according to  claim 1 , further comprising:
 a black matrix disposed between at least two of the first, second and third pixels, 
 wherein a lateral side surface of the black matrix directly contacts a lateral side surface of one of the first or second color-conversion layers. 
 
     
     
       14. The display device according to  claim 1 , further comprising:
 a transparent layer disposed in the third pixel and on a same layer as the first and second color-conversion layers, 
 wherein the transparent layer is configured to pass the third color light emitted from the organic light emitting diode. 
 
     
     
       15. The display device according to  claim 1 , further comprising;
 an encapsulation layer disposed on the organic light emitting diode, wherein a bottom surface of the light scattering layer is in contact with the encapsulation layer. 
 
     
     
       16. A display device, comprising:
 a blue organic light emitting diode disposed in a red pixel, a green pixel, and a blue pixel; 
 a red color-conversion layer disposed on the blue organic light emitting diode in the red pixel, wherein the red color-conversion layer is configured to convert a blue light emitted from the blue organic light emitting diode into a red light; 
 a green color-conversion layer disposed on the blue organic light emitting diode in the green pixel, wherein the green color-conversion layer is configured to convert the blue light emitted from the blue organic light emitting diode into a green light; 
 a black matrix disposed between the red, green and blue pixels; and 
 a light scattering layer disposed only on the blue organic light emitting diode in the blue pixel, 
 wherein a lateral surface of the light scattering layer is in contact with the black matrix. 
 
     
     
       17. The display device according to  claim 16 , further comprising:
 a first blue color filter disposed between the red color-conversion layer and the blue organic light emitting diode in the red pixel; and 
 a second blue color filter disposed between the green color-conversion layer and the blue organic light emitting diode in the green pixel. 
 
     
     
       18. The display device according to  claim 17 , further comprising:
 a third blue color filter disposed on the organic light emitting diode in the blue pixel. 
 
     
     
       19. The display device according to  claim 16 , further comprising:
 a red color filter disposed on the red color-conversion layer in the red pixel. 
 
     
     
       20. The display device according to  claim 16 , further comprising:
 a green color filter disposed on the green color-conversion layer in the green pixel. 
 
     
     
       21. A display device, comprising:
 a red pixel, a green pixel and a blue pixel; 
 an organic light emitting diode including a blue organic emission layer configured to emit blue light, wherein the blue organic emission layer is disposed across the red, green and blue pixels; 
 a red color-conversion layer disposed in the red pixel, the red color-conversion layer being configured to convert the blue light emitted from the blue organic emission layer into a red light; 
 a green color-conversion layer disposed in the green pixel, the green color-conversion layer being configured to convert the blue light emitted from the blue organic emission layer into a green light; 
 a transparent layer disposed in the blue pixel, the transparent layer being configured to pass the blue light emitted from the blue organic emission layer; 
 a red color filter disposed in the red pixel; 
 a green color filter disposed in the green pixel; 
 a blue color filter disposed in the blue pixel; 
 a first blue auxiliary color filter disposed between the red color-conversion layer and the blue organic emission layer in the red pixel; and 
 a second blue auxiliary color filter disposed between the green color-conversion layer and the blue organic emission layer in the green pixel,; and 
 a black matrix disposed between at least two of the red, green and blue pixels, 
 wherein a lateral side surface of the black matrix directly contacts a lateral side surface of at least one of the red color-conversion layer, the green color-conversion and the transparent layer, and  
 wherein the red, green and blue pixels do not overlap with a polarizer. 
 
     
     
       22. The display device according to  claim 10 , wherein a top surface of the light scattering layer is in contact with the fifth color filter. 
     
     
       23. The display device according to  claim 16 , wherein the blue organic light emitting diode comprises a light emission layer that is disposed continuously across the red, green, and blue pixels. 
     
     
       24. The display device according to  claim 1 , wherein the display device does not include a polarizer. 
     
     
       25. The display device according to  claim 16 , wherein the display device does not include a polarizer. 
     
     
       26. A display device, comprising:
 a light emitting element disposed in a first pixel configured to emit a first color light, a second pixel configured to emit a second color light, and a third pixel configured to emit a third color light;   a first color-conversion laver disposed on the light emitting element in the first pixel;   a second color-conversion laver disposed on the light emitting element in the second pixel;   a black matrix disposed between the first, second, and third pixels; and   a light scattering layer disposed only on the light emitting element in the third pixel,   wherein a lateral surface of the light scattering layer is in contact with the black matrix.   
     
     
       27. The display device according to  claim 26 , wherein the light emitting element is configured to emit a blue light. 
     
     
       28. The display device according to  claim 26 , wherein the light scattering layer comprises scattering particles. 
     
     
       29. The display device according to  claim 28 , wherein the scattering particles comprise titanium dioxide. 
     
     
       30. The display device according to  claim 26 , wherein the first color light is red, the second color light is green, and the third color light is blue. 
     
     
       31. The display device according to  claim 26 , wherein the first color light comprises a light having a wavelength in a range of from 600 nm to 640 nm, the second color light comprises a light having a wavelength in a range of from 520 nm to 580 nm, and the third color light comprises a light having a wavelength in a range of from 400 nm to 480 nm. 
     
     
       32. The display device according to  claim 26 , wherein the light emitting element comprises:
 a first electrode;   a second electrode; and   a light emission layer disposed between the first electrode and the second electrode.   
     
     
       33. The display device according to  claim 32 , wherein the light emission layer comprises a single emission layer. 
     
     
       34. The display device according to  claim 32 , wherein the light emission layer comprises a plurality of emission layers. 
     
     
       35. The display device according to  claim 34 , wherein the plurality of emission layers comprise a first emission layer and a second emission layer,
 wherein the light emission layer further comprises a charge generation layer disposed between the first emission layer and the second emission layer.   
     
     
       36. The display device according to  claim 35 , wherein the first emission layer and the second emission layer are configured to emit the third color light. 
     
     
       37. The display device according to  claim 32 , wherein the first electrode comprises at least one of ytterbium, indium tin oxide, indium zinc oxide, indium tin zinc oxide, zinc oxide, and tin oxide. 
     
     
       38. The display device according to  claim 32 , wherein the second electrode comprises at least one of indium tin oxide, indium zinc oxide, and indium tin zinc oxide. 
     
     
       39. The display device according to  claim 32 , wherein the second electrode comprises a reflecting plate. 
     
     
       40. The display device according to  claim 32 , wherein the light emission layer further comprises at least one of a hole transport layer, an electron transport layer, a hole block layer, an electron block layer, a hole injection layer, and an electron injection layer. 
     
     
       41. The display device according to  claim 32 , further comprising a pixel defining layer disposed on the second electrode, wherein the black matrix overlaps the pixel defining layer. 
     
     
       42. The display device according to  claim 26 , wherein the first color-conversion layer is configured to convert the third color light into the first color light, and
 wherein the second color-conversion layer is configured to convert the third color light into the second color light.   
     
     
       43. The display device according to  claim 26 , further comprising:
 a first color filter disposed on the first color-conversion layer in the first pixel;   a second color filter disposed on the second color-conversion layer in the second pixel; and   a third color filter disposed on the light emitting element in the third pixel, wherein the third color filter is configured to transmit the third color light.   
     
     
       44. The display device according to  claim 43 , further comprising:
 a fourth color filter disposed in the first pixel, wherein the fourth color filter is configured transmit a color light different from the first color filter; and   a fifth color filter disposed in the second pixel, wherein the fifth color filter is configured transmit a color light different from the second color filter.   
     
     
       45. The display device according to  claim 44 , wherein at least a portion of the fourth color filter overlaps the first color filter and the first color-conversion layer in the first pixel, and
 wherein at least a portion of the fifth color filter overlaps the second color filter and the second color-conversion layer in the second pixel.   
     
     
       46. The display device according to  claim 44 , wherein the fourth color filter and the fifth color filter are configured to transmit the third color light. 
     
     
       47. The display device according to  claim 43 , wherein the first color filter in the first pixel, the second color filter in the second pixel, and the third color filter in the third pixel are spaced apart from each other. 
     
     
       48. The display device according to  claim 26 , wherein the light scattering layer is configured to convert anisotropic light into isotropic light. 
     
     
       49. The display device according to  claim 26 , wherein a lateral surface of each of the first and second color-conversion layers contacts the black matrix. 
     
     
       50. The display device according to  claim 26 , further comprising;
 an encapsulation layer disposed between the light emitting element and the first and second color-conversion layers and between the light emitting element and the black matrix.   
     
     
       51. The display device according to  claim 50 , wherein the encapsulation laver comprises at least one inorganic layer and at least one organic layer. 
     
     
       52. The display device according to  claim 51 , wherein the at least one inorganic layer and the at least one organic layer are laminated alternately. 
     
     
       53. The display device according to  claim 26 , wherein the black matrix comprises a first black matrix layer disposed between the first color-conversion layer and the second color conversion layer. 
     
     
       54. The display device according to  claim 53 , wherein a thickness of the first black matrix layer is equal to a thickness of at least one of the first color-conversion layer and the second color conversion layer. 
     
     
       55. The display device according to  claim 53 , wherein the black matrix further comprises a second black matrix layer disposed between a first color filter disposed on the first color-conversion layer in the first pixel and a second color filter disposed on the second color-conversion layer in the second pixel. 
     
     
       56. The display device according to  claim 26 , wherein the display device does not include a polarizer. 
     
     
       57. The display device according to  claim 56 , wherein the polarizer is configured to polarize light incident into the display device for reducing external light reflection. 
     
     
       58. The display device according to  claim 56 , wherein the display device has a reduced thickness and improved light efficiency by omission of the polarizer relative to another display device that includes the polarizer. 
     
     
       59. The display device according to  claim 26 , wherein the first color-conversion layer includes first color quantum dots and the second color-conversion layer includes second color quantum dots. 
     
     
       60. The display device according to  claim 26 , wherein the light emitting element comprises a light emission layer that is disposed continuously across the first, second, and third pixels.