Color filter and display apparatus including the same

• US 10,185,066 B2
• Filed: 07/18/2017
• Issued: 01/22/2019
• Est. Priority Date: 08/11/2016
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Display Company Limited (Samsung Group)
• Inventors: Chae, Kyungtae, Chae, Seungyeon
• Primary Examiner(s): Chien, Lucy P
• Application Number:
  US15/652,686
• Publication Number:
  US 20180045866A1
• Time in Patent Office: 553 Days
• Field of Search: 349106
• CPC Class Codes: G02B 5/207 comprising semiconducting materials
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133516 Methods for their manufacture, e.g. printing, electro-deposition or photolithography
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• CPC Class Codes: G02F 2202/108 quantum wells
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: G03F 7/0007 Filters, e.g. additive colour filters; Components for display devices
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A color filter includes a substrate, a first color conversion layer, a second color conversion layer, a barrier wall, and a light blocking layer. The substrate includes a first pixel region spaced from a second pixel region. The first color conversion layer is on the first pixel region and converts incident light to light of a first color. The second color conversion layer is on the second pixel region and converts the incident light to light of a second color. The barrier wall is between the first and second color conversion layers over the substrate. The light blocking layer extends continuously on a bottom surface and a side surface of the barrier wall, and the bottom surface faces the substrate.

Claims

1. A color filter, comprising:

a substrate including a first pixel region spaced from a second pixel region;

a first color conversion layer, on the first pixel region, to convert incident light to light of a first color;

a second color conversion layer, on the second pixel region, to convert the incident light to light of a second color;

a barrier wall between the first color conversion layer and the second color conversion layer over the substrate; and

a light blocking layer extending continuously on a bottom surface and a side surface of the barrier wall, the bottom surface facing the substrate, wherein the light blocking layer blocks the incident light, the light of the first color emitted from the first color conversion layer, and the light of the second color emitted from the second color conversion layer.

2. The color filter as claimed in claim 1, wherein the light blocking layer includes:

a black matrix layer between the barrier wall and the substrate, and

a reflection layer between the barrier wall and the first and second color conversion layers.

3. The color filter as claimed in claim 2, wherein the reflection layer includes a same material as the black matrix layer and continuously extends from the black matrix layer.

4. The color filter as claimed in claim 1, wherein:

a cross-section of the barrier wall has an inverse-tapered shape, and

a width of the inverse-tapered shape increases in a direction leading away from the substrate.

5. The color filter as claimed in claim 1, wherein:

the first color conversion layer includes first quantum dots to emit the light of the first color when excited by the incident light, and

the second color conversion layer includes second quantum dots to emit the light of the second color when excited by the incident light.

6. The color filter as claimed in claim 5, wherein:

the first color conversion layer includes;

a first quantum-dot color conversion layer that includes the first quantum dots, and

a first color filter layer to reflect the incident light, the first color filter layer between the substrate and the first quantum-dot color conversion layer, and

the second color conversion layer includes;

a second quantum-dot color conversion layer that includes the second quantum dots, and

a second color filter layer to reflect the incident light, the second color filter layer between the substrate and the second quantum-dot color conversion layer.

7. The color filter as claimed in claim 6, wherein:

the first color filter layer is to selectively transmit the light of the first color emitted from the first quantum-dot color conversion layer, and

the second color filter layer is to selectively transmit the light of the second color emitted from the second quantum-dot color conversion layer.

8. The color filter as claimed in claim 6, wherein the first color conversion layer includes a band-pass filter layer to selectively transmit the incident light, the band-pass filter layer over the first quantum-dot color conversion layer.

9. The color filter as claimed in claim 1, wherein:

the incident light is blue light or ultraviolet light,

the first color is red, and

and the second color is green.

10. The color filter as claimed in claim 1, wherein:

the light blocking layer includes a plurality of layers continuously stacked on the bottom surface and the side surface of the barrier wall, wherein a portion of the light blocking layer is between the substrate and the bottom surface of the barrier wall, and

at least one of the layers includes a continuously extended metal layer.

11. The color filter as claimed in claim 1, wherein the light blocking layer includes a first layer, a second layer on the first layer, and a third layer on the second layer, wherein the first and third layers include a transparent metal oxide, and the second layer includes a metal.

12. The color filter as claimed in claim 1, wherein:

the substrate includes a third pixel region spaced apart from the first and second pixel regions, and

the color filter includes a penetration layer on the third pixel region, the color filter to transmit the incident light.

13. The color filter as claimed in claim 1, wherein:

the substrate includes a third pixel region spaced apart from the first and second pixel regions, and

the color filter includes a third color conversion layer on the third pixel region, the color filter to convert the incident light to light of a third color.

14. The color filter as claimed in claim 1, wherein each of thicknesses of the first and second color conversion layers are less than or equal to a height from the substrate to a top surface of the barrier wall.

15. The color filter as claimed in claim 1, wherein the first color conversion layer includes a first quantum-dot color conversion layer including first quantum dots, scattered particles and a photosensitive resin layer, the first quantum dots and scattered particles being dispersed in the photosensitive resin layer.

16. A method for manufacturing a color filter, the method comprising:

forming a sacrificial layer exposing a light blocking region between a first pixel region and a second pixel region, the first and second pixel regions spaced from each other over a substrate;

forming a reflection material layer over the substrate to cover the light blocking region of the substrate and the sacrificial layer, and forming a trench corresponding to the light blocking region and limited by the reflection material layer;

forming an organic material pattern embedding the trench;

etching the reflection material layer using the organic material pattern as a mask to expose the sacrificial layer, and forming a reflection layer over the light blocking region of the substrate and a side surface of the sacrificial layer;

exposing the first and second pixel regions of the substrate by removing the sacrificial layer;

forming, on the first pixel region, a first color conversion layer to convert incident light thereon to light of a first color; and

forming, on the second pixel region, a second color conversion layer to convert the incident light thereon to light of a second color, wherein the light blocking layer blocks the incident light, the light of the first color emitted from the first color conversion layer, and the light of the second color emitted from the second color conversion layer.

17. The method as claimed in claim 16, wherein forming the first and second color conversion layers are performed using an inkjet coating method.

18. The method as claimed in claim 16, further comprising:

forming a barrier wall embedding the trench limited by the reflection layer, wherein forming the barrier wall includes removing part of the organic material pattern.

19. The method as claimed in claim 16, wherein the trench has a width that increases in a direction leading away from the substrate.

20. The method as claimed in claim 16, wherein forming the reflection material layer includes continuously stacking a plurality of layers on the substrate.

21. A display apparatus, comprising:

a display including first and second pixels; and

a color filter over the display and including first and second pixel regions respectively overlapping the first and second pixels, wherein the color filter includes;

a substrate including the first and second pixel regions;

a first color conversion layer, on the first pixel region of the substrate, to convert incident light to light of a first color;

a second color conversion layer, on the second pixel region of the substrate, to convert the incident light to light of a second color;

a barrier wall between the first color conversion layer and the second color conversion layer over the substrate; and

a light blocking layer extending continuously on a bottom surface of the barrier wall and a side surface of the barrier wall, the bottom surface facing the substrate, wherein the light blocking layer blocks the incident light, the light of the first color emitted from the first color conversion layer, and the light of the second color emitted from the second color conversion layer.

22. The display apparatus as claimed in claim 21, wherein the display includes a backlight and a liquid crystal display panel over the backlight.

23. The display apparatus as claimed in claim 21, wherein each of the first and second pixels includes an organic light-emitting device.