Display device

Patent metadata

Field	Value
Publication number	US-2018259691-A1
Application number	US-201715761131-A
Country	US
Kind code	A1
Filing date	Jun 7, 2017
Priority date	Jun 24, 2016
Publication date	Sep 13, 2018
Grant date	—

Abstract

A display device is disclosed. The display device includes a display panel, and a grating layer arranged inside or outside of the display panel. Along a direction pointing from a center of a sight concentration area of the display device to a non-sight concentration area of the display device, a grating period of the grating layer decreases gradually. When incident light incident on the grating layer is diffracted at an area of the grating layer corresponding to the non-sight concentration area of the display device, the obtained light of non-zero order diffraction falls into a sight of a viewer.

First claim

1 . A display device, comprising: a display panel, and a grating layer arranged inside or outside of the display panel,
wherein along a direction pointing from a center of a sight concentration area of the display device to a non-sight concentration area of the display device, a grating period of the grating layer decreases gradually, when incident light incident on the grating layer is diffracted in an area of the grating layer corresponding to the non-sight concentration area of the display device, obtained light of non-zero order diffraction falls into a sight of a viewer.

2 . The display device according to claim 1 , wherein the display device comprises a plurality of pixels of a first color, a plurality of pixels of a second color and a plurality of pixels of a third color, and the grating layer comprises a grating region of the first color corresponding to the pixels of the first color, a grating region of the second color corresponding to the pixels of the second color, and a grating region of the third color corresponding to the pixels of the third color;
the center of the sight concentration area corresponds to a center of the display device, and along a lateral direction of the display device, from the center of the display device to both sides of the display device, a grating period of the grating region of the first color, a grating period of the grating region of the second color, and a grating period of the grating region of the third color respectively decrease gradually.

3 . The display device according to claim 2 , wherein along the lateral direction of the display device, the display device comprises a plurality of columns of pixels of the first color, a plurality of columns of pixels of the second color, and a plurality of columns of pixels of the third color, the columns of pixels of the first color, the columns of pixels of the second color, and the columns of pixels of the third color are arranged alternately, each column of pixels of the first color comprises a plurality of pixels of the first color arranged along a longitudinal direction of the display device, each column of pixels of the second color comprises a plurality of pixels of the second color arranged along the longitudinal direction of the display device, and each column of pixels of the third color comprises a plurality of pixels of the third color arranged along the longitudinal direction of the display device;
the grating layer comprises a plurality of grating bulges, which are bar-shaped grating bulges, the grating bulges extend along the longitudinal direction of the display device and the grating bulges are arranged in parallel along the lateral direction of the display device.

4 . The display device according to claim 1 , wherein the display device comprises a plurality of pixels of a first color, a plurality of pixels of a second color and a plurality of pixels of a third color, and the grating layer comprises a grating region of the first color corresponding to the pixels of the first color, a grating region of the second color corresponding to the pixels of the second color, and a grating region of the third color corresponding to the pixels of the third color;
the center of the sight concentration area corresponds to a center of the display device, and along a longitudinal direction of the display device, from the center of the display device to both sides of the display device, a grating period of the grating region of the first color, a grating period of the grating region of the second color, and a grating period of the grating region of the third color respectively decrease gradually.

5 . The display device according to claim 4 , wherein along the longitudinal direction of the display device, the display device comprises a plurality of rows of pixels of the first color, a plurality of rows of pixels of the second color, and a plurality of rows of pixels of the third color, the rows of pixels of the first color, the rows of pixels of the second color, and the rows of pixels of the third color are arranged alternately, each row of pixels of the first color comprises a plurality of pixels of the first color arranged along a lateral direction of the display device, each row of pixels of the second color comprises a plurality of pixels of the second color arranged along the lateral direction of the display device, and each rows of pixels of the third color comprises a plurality of pixels of the third color arranged along the lateral direction of the display device;
the grating layer comprises a plurality of grating bulges, which are bar-shaped grating bulges, the grating bulges extend along the lateral direction of the display device and the grating bulges are arranged in parallel along the longitudinal direction of the display device.

6 . The display device according to claim 1 , wherein the display device comprises a plurality of pixels of a first color, a plurality of pixels of a second color and a plurality of pixels of a third color arranged in an array, and the grating layer comprises a grating region of the first color corresponding to the pixels of the first color, a grating region of the second color corresponding to the pixels of the second color, and a grating region of the third color corresponding to pixels of the third color;
the center of the sight concentration area corresponds to a center of the display device, and along a longitudinal direction of the display device, from the center of the display device to both sides of the display device, a grating period of the grating region of the first color, a grating period of the grating region of the second color, and a grating period of the grating region of the third color respectively decrease gradually; along a lateral direction of the display device, from the center of the display device to both sides of the display device, the grating period of the grating region of the first color, the grating period of the grating region of the second color, and the grating period of the grating region of the third color respectively decrease gradually.

7 . The display device according to claim 1 , wherein the grating layer comprises a plurality of grating bulges, and a thickness h A of a grating bulge corresponding to the sight concentration area satisfies:

h
A

=

m
A




λ



n
GA

-

n
SA



wherein, n GA is a refractive index of the grating bulge corresponding to the sight concentration area, n SA is a refractive index of a filler in a gap between two adjacent grating bulges corresponding to the sight concentration area, λ is a wavelength of incident light incident to the grating layer, m A is a first constant, which satisfies: i−½<m A <i+½, i=1,2,3,4 . . . ;
a thickness h B of a grating bulge corresponding to the non-sight concentration area satisfies:

h
B

=

m

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Wei
• Yang Yafeng
• Chen Xiaochuan
• Wang Qian
• Tan Jifeng
• Gao Jian
• Ma Xinli
• Zhang Can
• Wang Can

Classifications

• G02F2201/305

  diffraction grating · CPC title

• G02B5/1819

  Plural gratings positioned on the same surface, e.g. array of gratings (plural diffractive elements positioned sequentially along the optical path G02B27/4272) · CPC title

• G02B5/201

  in the form of arrays · CPC title

• G02B5/1866 Primary

  Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials (G02B5/1809, G02B5/1828, G02B5/1833, G02B5/1838 and G02B5/1847 take precedence) · CPC title

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title