Display device

Patent metadata

Field	Value
Publication number	US-10216027-B2
Application number	US-201615507849-A
Country	US
Kind code	B2
Filing date	Mar 25, 2016
Priority date	Sep 25, 2015
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A display device includes a liquid crystal display panel ( 3 ) and a backlight source ( 2 ), and further includes a plurality of bandpass filters ( 1 ) corresponding to respective pixel units of the liquid crystal display panel ( 3 ), the bandpass filters ( 1 ) being configured to perform narrowband filtering on the light emergent from the backlight source ( 2 ). By adopting the bandpass filters ( 1 ), the narrowband filtering on the red, green and blue light is realized by using a narrowband interference filtering method, such that the effect of improving the gamut of the display device is achieved and the high-gamut display is realized.

First claim

The invention claimed is:

1. A display device, comprising a liquid crystal display panel and a backlight source, and further comprising a plurality of bandpass filters disposed in the display device and corresponding to a pixel array of the liquid crystal display panel, the bandpass filters being configured to perform narrowband filtering on light emergent from the backlight source,
wherein, each of the bandpass filters is a combination of a first structure of

(

H
2

⁢
L
⁢

⁢

H
2

)

m

 and a second structure of

(

L
2

⁢
H
⁢

⁢

L
2

)

n

,

wherein,

(

H
2

⁢
L
⁢

⁢

H
2

)

m

 represents the first structure is comprised of m tri-layer film layers, and the tri-layer film layers are respectively: a layer of high-refractive index film layer with half optical thickness, a layer of low-refractive index film layer with one optical thickness and another layer of high-refractive index film layer with half optical thickness,
wherein,

(

L
2

⁢
H
⁢

⁢

L
2

)

n

 represents the second structure is comprised ofn tri-laver film layers, and the tri-layer film layers are respectively: a layer low-refractive index film layer with half optical thickness, a layer of high-refractive index film layer with one optical thickness and another layer of low-refractive index film layer with half optical thickness,
wherein, H and L represent a high-refractive index film layer and a low-refractive index film layer with an optical thickness of λ/4, H/2 and L/2 represent a high-refractive index film layer and a low-refractive index film layer with an optical thickness of λ/8, m and n are positive integers, and λ is a wavelength of light.

2. The display device according to claim 1 , wherein the pixel array includes a plurality of pixel units, each of the pixel units includes three sub-pixel units; and
the plurality of bandpass filters are tri-bandpass filters in one-to-one correspondence with the respective pixel units, and the tri-bandpass filter is capable of adjusting central wavelengths and half-height peak widths of red light, green light and blue light emitted from the three sub-pixel units constituting one pixel unit.

3. The display device according to claim 1 , wherein the pixel array includes a plurality of pixel units, each of the pixel units includes three sub-pixel units;
the plurality of bandpass filters are mono-bandpass filters in one-to-one correspondence with the respective pixel units; and
each of the mono-bandpass filters is capable of adjusting a central wavelength and a half-height peak width of light of color corresponding thereto.

4. The display device according to claim 1 , wherein the bandpass filters are disposed between the backlight source and the liquid crystal display panel, and are disposed on an emergent surface of the backlight source, or disposed on an incident surface of the liquid crystal display panel.

5. The display device according to claim 4 , wherein the incident surface of the liquid crystal display panel is provided with a first polarizing sheet, arid the emergent surface of the liquid crystal display panel is provided with a second polarizing sheet;
the bandpass filters are disposed between the backlight source and the first polarizing sheet;
or, the bandpass filters are disposed between the first polarizing sheet and the liquid crystal display panel.

6. The display device according to claim 5 , wherein the liquid crystal display panel includes an array substrate and a color filter substrate which are sequentially disposed on an emergent side of the backlight source, the array substrate is provided with the pixel array, and the bandpass filters are disposed on the incident surface of the array substrate.

7. The display device according to claim 1 , wherein the bandpass filters are disposed on an emergent surface of the liquid crystal display panel.

8. The display device according to claim 7 , wherein an incident surface of the liquid crystal display panel is provided with a first polarizing sheet, and the emergent surface of the display panel is provided with a second polarizing sheet; and
the bandpass filters are disposed between the liquid crystal display panel and the second polarizing sheet.

9. The display device according to claim 8 , wherein the liquid crystal display panel includes an array substrate and a color filter substrate which are sequentially disposed on an emergent side of the backlight source, and the bandpass filters are disposed on the emergent surface of the color filter substrate.

10. The display device according to claim 1 , wherein the liquid crystal display panel includes an array substrate and a counter substrate which are sequentially disposed on an emergent side of the backlight source, and the bandpass filters are disposed on a side of the counter substrate facing the array substrate.

11. The display device according to claim 2 , wherein the bandpass filters are disposed between the backlight source and the liquid crystal display panel, and are disposed on an emergent surface of the backlight source, or disposed on an incident surface of the liquid crystal display panel.

12. The display device according to claim 3 , wherein the bandpass filters are disposed between the backlight source and the liquid crystal display panel, and are disposed on an emergent surface of the backlight source, or disposed on an incident surface of the liquid crystal display panel.

13. The display device according to claim 11 , wherein the incident surface of the liquid crystal displ

Assignees

• Boe Technology Group Co Ltd

Inventors

• Li Yingyi

Classifications

• G02B5/28

  Interference filters · CPC title

• G02F1/136209

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title

• G02F1/133514 Primary

  Colour filters · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title