Liquid crystal display and manufacturing method thereof

• US 10,429,690 B2
• Filed: 05/14/2018
• Issued: 10/01/2019
• Est. Priority Date: 03/15/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Jae Byung, Yun, Sung Sik, Kang, Jong Hyuk, Park, Hae Il, Cho, Hyun Min
• Primary Examiner(s): Briggs, Nathanael R
• Application Number:
  US15/978,288
• Publication Number:
  US 20180259811A1
• Time in Patent Office: 505 Days
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• CPC Class Codes: G02F 2/02 Frequency-changing of light, e.g. by quantum counters
• CPC Class Codes: G02F 2201/08 light absorbing layer
• CPC Class Codes: G02F 2202/02 organic material
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: G02F 2203/055 wavelength filtering

Abstract

A wide viewing angle liquid crystal display includes color filters having a quantum dot and scattering particles and liquid crystal layer disposed in a microcavity, a distance between the color filter and the liquid crystal layer being sized to minimize display deterioration due to parallax.

Claims

1. A display device, comprising:

a first substrate and a second. substrate overlapping each other;

a color filter disposed on the second substrate, the color filter comprising a first color filter comprising a red quantum dot particle, a second color filter comprising a green quantum dot particle, and a third color filter comprising a transparent material and scattering particles therein;

a blue light blocking layer disposed between the second substrate and the first color filter and between the second substrate and the second color filter; and

a blue light transmitting layer disposed between the color filter and the first substrate,

wherein the blue light blocking layer and the third color filter are disposed on the same surface of the second substrate, and

wherein a light emitted from a region overlapping the first color filter passes through the blue light transmitting layer, the first color filter, the blue light blocking layer and the second substrate in this order.

2. The display device of claim 1, wherein:

the blue light blocking layer does not overlap the third color filter.

3. The display device of claim 1, wherein

the blue light transmitting layer overlaps the first color filter, the second color filter and the third color filter.

4. The display device of claim 3, wherein:

the blue light transmitting layer transmits light in a blue wavelength band and reflects light in the other wavelength bands.

5. The display device of claim 4, wherein:

the blue light transmitting layer comprises at least two layers having different refractive indexes.

6. A display device, comprising:

a first substrate and a second substrate overlapping each other;

a color filter disposed on the second substrate, the color filter comprising a first color filter comprising a red quantum dot particle, a second color filter comprising a green quantum dot particle, and a third color filter comprising a transparent material;

a blue light blocking layer disposed between the second substrate and the first color filter and between the second substrate and the second color filter; and

a blue light transmitting layer disposed between the color filter and the first substrate and overlapping the first color filter, the second color filter and the third color filter,

wherein the blue light blocking layer and the third color filter are disposed on the same surface of the second substrate,

wherein the blue light transmitting layer comprises at least two layers having different refractive indexes, and

wherein a light emitted from a region overlapping the first color filter passes through the blue light transmitting layer, the first color filter, the blue light blocking layer and the second substrate in this order.

7. The display device of claim 6, wherein:

the at least two layers having different refractive indexes are laminated alternately.

8. The display device of claim 6, wherein:

the blue light blocking layer does not overlap the third color filter.

9. The display device of claim 6, wherein:

the blue light transmitting layer transmits light in a blue wavelength band and reflects light in the other wavelength bands.

10. A display device, comprising:

a first substrate and a second substrate overlapping each other;

a color filter disposed on the second substrate, the color filter comprising a first color filter comprising a red quantum dot particle, a second color filter comprising a green quantum dot particle, and a third color filter comprising a transparent material;

a blue light blocking layer disposed between the second substrate and the first color filter and between the second substrate and the second color filter; and

a blue light transmitting layer disposed between the color filter and the first substrate and overlapping the first color filter, the second color filter and the third color filter,

wherein the blue light blocking layer and the third color filter are disposed on the same surface of the second substrate facing a liquid crystal layer,

wherein a sum of thickness of the first color filter and thickness of the blue light blocking layer is substantially the same as a thickness of the third color filter, and

wherein a sum of thickness of the second color filter and thickness of the blue light blocking layer is substantially the same as the thickness of the third color filter.