Liquid crystal display and manufacturing method thereof

• US 9,995,958 B2
• Filed: 04/27/2017
• Issued: 06/12/2018
• 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:
  US15/499,542
• Publication Number:
  US 20170227813A1
• Time in Patent Office: 411 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 liquid crystal display, comprising:

a backlight unit comprising a light source comprising a blue light source;

a display panel comprising;

a first substrate and a second substrate;

a liquid crystal layer disposed between the first substrate and the second substrate;

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 organic material and scattering particles therein;

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

a blue light transmitting layer disposed between the color filters and the liquid crystal layer,

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

wherein the red quantum dot particle is disposed between the blue light transmitting layer and the blue light blocking layer,

wherein the green quantum dot particle is disposed between the blue light transmitting layer and the blue light blocking layer, 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 liquid crystal display of claim 1, wherein:

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

3. The liquid crystal display of claim 1,

wherein the blue light transmitting layer disposed between the color filter and the liquid crystal layer overlaps the first color filter, the second color filter and the third color filter.

4. The liquid crystal display 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 liquid crystal display of claim 4, wherein:

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

6. The liquid crystal display of claim 1, further comprising:

a lower polarizer disposed between the backlight unit and the first substrate; and

an upper polarizer disposed between the liquid crystal layer and the color filter.

7. A liquid crystal display, comprising:

a backlight unit comprising a light source comprising a blue light source;

a display panel comprising;

a first substrate and a second substrate;

a liquid crystal layer disposed between the first substrate and the second substrate;

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 organic material;

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

a blue light transmitting layer disposed between the color filter and the liquid crystal layer 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

wherein the red quantum dot particle is disposed between the blue light transmitting layer and the blue light blocking layer,

wherein the green quantum dot particle is disposed between the blue light transmitting layer and the blue light blocking layer, 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.

8. The liquid crystal display of claim 7, wherein:

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

9. The liquid crystal display of claim 7, wherein:

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

10. The liquid crystal display of claim 7, wherein:

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

11. The liquid crystal display of claim 7, further comprising:

a lower polarizer disposed between the backlight unit and the first substrate; and

an upper polarizer disposed between the liquid crystal layer and the color filter.