Display panel, manufacture method therefor, and display device

Patent metadata

Field	Value
Publication number	US-12349575-B2
Application number	US-202117772595-A
Country	US
Kind code	B2
Filing date	May 26, 2021
Priority date	May 26, 2021
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

The present disclosure provides a display panel, having a light emitting layer, a transparent spacing layer on the light emitting layer, and a wavelength converting layer on the transparent spacing layer, wherein according to the luminance change ratios of the wavelength converting units of adjacent pixels and the light path property of the transparent spacing layer, the cross color issue in wavelength-conversion type display panels is at least partially solved by controlling the intensity proportions of the light arriving at the wavelength converting units of adjacent sub-pixels within a certain range.

First claim

What is claimed is:

1. A display panel comprising:
a light emitting layer on a base substrate,
a transparent spacing layer on the light emitting layer, and
a wavelength converting layer on the transparent spacing layer,
wherein the display panel comprises sub-pixels arranged in an array, the sub-pixels arranged in an array comprise a first sub-pixel and a second sub-pixel adjacent to each other, wherein in each of the first sub-pixel and the second sub-pixel, one light emitting unit in the light emitting layer and one wavelength converting unit in the wavelength converting layer are comprised, and the light emitting unit and the wavelength converting unit are stacked and spaced apart by the transparent spacing layer,
the light emitting units of the first sub-pixel and the second sub-pixel are spaced apart by a first pixel defining layer in the light emitting layer, and have a top surface spacing of d2,
the wavelength converting unit of the first sub-pixel is a first wavelength converting unit which has a luminance change ratio of ra on light emitted by the light emitting unit, and the wavelength converting unit of the second sub-pixel is a second wavelength converting unit which has a luminance change ratio of rb on light emitted by the light emitting unit, and the wavelength converting units of the first sub-pixel and the second sub-pixel are spaced apart by a second pixel defining layer in the wavelength converting layer,
in a direction from the first sub-pixel to the second sub-pixel, relative to an orthographic projection of a boundary between a top surface of the light emitting unit of the second sub-pixel and the first pixel defining layer between the light emitting units of the first sub-pixel and the second sub-pixel on the base substrate, an orthographic projection of a boundary between a bottom surface of the second wavelength converting unit and the second pixel defining layer between the wavelength converting units of the first sub-pixel and the second sub-pixel on the base substrate is shifted by d4 2 ,
wherein
in all light which is incident into the transparent spacing layer from the top surface of the light emitting unit and may reach a top surface of the transparent spacing layer, light with an emergence angle of α 1 or more has an intensity proportion of x1% or less, wherein x1%=p1×(ra/rb), wherein p1≤5%,
wherein when light starting from a bottom surface of the transparent spacing layer has an emergence angle of α 1 , a projection of a light path thereof through the transparent spacing layer on the base substrate has a length less than or equal to d2+d4 2 .

2. The display panel according to claim 1 , wherein p1≤2%.

3. The display panel according to claim 1 , wherein when the light starting from the bottom surface of the transparent spacing layer has an emergent angle of α 1 , a difference between the length of the projection of the light path thereof through the transparent spacing layer on the base substrate and d2+d4 2 is less than or equal to 5 μm.

4. The display panel according to claim 1 , wherein in a direction from the second sub-pixel to the first sub-pixel, relative to an orthographic projection of a boundary between a top surface of the light emitting unit of the first sub-pixel and the first pixel defining layer between the light emitting units of the first sub-pixel and the second sub-pixel on the base substrate, an orthographic projection of a boundary between a bottom surface of the first wavelength converting unit and the second pixel defining layer between the wavelength converting units of the first sub-pixel and the second sub-pixel on the base substrate is shifted by d4 1 ,
wherein
in all light which is incident into the transparent spacing layer from the top surface of the light emitting unit and may reach a top surface of the transparent spacing layer, light with an emergence angle of α 2 or more has an intensity proportion of x2% or less, wherein x2%=p2×(rb/ra), wherein p2≤5%,
wherein when light from a bottom surface of the transparent spacing layer has an emergence angle of α 2 , a projection of a light path thereof through the transparent spacing layer on the base substrate has a length less than or equal to d2+d4 1 .

5. The display panel according to claim 4 , wherein p2=p1.

6. The display panel according to claim 4 , wherein d4 1 =d4 2 .

7. The display panel according to claim 4 , wherein |d4 1 |≤5 μm, and |d4 2 |≤5 μm.

8. The display panel according to claim 1 , wherein the transparent spacing layer has a thickness of d1, and comprises m sub-layers stacked bottom up, wherein an i-th sub-layer has a thickness of L i and a refractive index of n i , wherein i is between 1 and m,
parameters meet the following equations:

d
⁢
1

=

∑

i
=
1

m

L
1

d2
+

d
⁢

4
2

=

∑

1
=
1

m

L
i

⁢
tan
⁢

θ

1
⁢
i

,

 wherein i is an integer between 1 and m, n i sin θ 1i is a constant, and θ 11 =α 1 .

9. The display panel according to claim 1 , wherein the sub-pixels arranged in an array further comprise a third sub-pixel adjacent to the first sub-pixel, wherein in the third sub-pixel, one light emitting unit in the light emitting layer and one transparent color filtering unit in the wavelength converting layer are comprised, and the light emitting unit and the transparent color filtering unit are stacked and spaced apart by the transparent spacing layer,
the light emitting units of the first sub-pixel and the third sub-pixel are spaced apart by the first pixel defining layer in the light emitting layer, and have a top surface spacing of d5,
the transparent color filtering unit does not convert a wavelength of a light emitted by the light emitting unit, and has a luminance change ratio of re on light emitted by the light emitting unit, and the wavelength converting unit of the first sub-pixel and the transparent color filtering unit of the third sub-pixel are spaced apart by the second pixel defining layer in the wavelength converting layer,
in a direction from the third sub-pixel to the first sub-pixel, relative to an orthographic projection of a boundary between a top surface of the light emitting unit of the first sub-pixel and the first pixel defining layer between the light emitting units of the first sub-pixel and the third sub-pixel

Assignees

• Boe Technology Group Co Ltd

Inventors

• Li Wei
• Zhang Yichi
• Zhang Can
• Wang Can
• Yuan Lijun
• Cong Ning
• Niu Jinfei
• Zhang Jingjing
• Xuan Minghua

Classifications

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K59/80

  Constructional details · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/1201

  Manufacture or treatment · CPC title

• H10K2102/3026

  Top emission · CPC title