CN-119767974-B - Display panel, preparation method of display panel and display device

Abstract

The invention provides a display panel, a preparation method of the display panel and a display device, wherein the display panel comprises a first substrate, a first pixel definition layer and a first light-emitting unit layer which are sequentially arranged, a first light-emitting area of the first light-emitting unit layer covers a first pixel definition opening of the first pixel definition layer in a plan view, a first non-light-emitting area of a first light-emitting material surrounds the first light-emitting area, four adjacent first light-emitting materials with the same color are used as first repeating units, each first repeating unit comprises two adjacent first light-emitting materials with the same color along a first direction and two adjacent first light-emitting materials with the same color along a second direction, and in the first repeating units, the four first light-emitting materials have a first center, and the width of the first non-light-emitting area of the first light-emitting material, which is close to the first center, is smaller than the width of the first non-light-emitting area, which is far from the first center. The invention can reduce the risk of color mixing of luminescent materials with different colors of the display panel.

Inventors

• CAO LEILEI
• QIU SHAOYA

Assignees

• 湖北长江新型显示产业创新中心有限公司

Dates

Publication Date

20260512

Application Date

20241213

Claims (19)

1. 1. A display panel, comprising: A first substrate; a first pixel defining layer located at one side of the first substrate, the first pixel defining layer including a plurality of first pixel defining openings; A first light emitting unit layer located on a side of the first pixel defining layer facing away from the first substrate, the first light emitting unit layer including a plurality of first light emitting materials including a first light emitting region and a first non-light emitting region surrounding the first light emitting region, each of the first light emitting regions covering one of the first pixel defining openings in a plan view; Wherein four adjacent first luminescent materials of the same color are used as first repeating units, and the first repeating units comprise two adjacent first luminescent materials of the same color along a first direction and two adjacent first luminescent materials of the same color along a second direction, wherein the first direction intersects with the second direction; in the first repeating unit, four of the first luminescent materials have a first center, and the width of the first non-luminescent region of the first luminescent material near the first center is smaller than the width of the first non-luminescent region far from the first center; In each first repeating unit, a first anode via corresponding to each first luminescent material is located at a position, far from the first center, of the first non-luminescent region of the first luminescent material, and four first anode vias are centrosymmetric.
2. 2. The display panel according to claim 1, wherein distances between the first pixel defining openings corresponding to the first luminescent materials of adjacent two identical colors are equal along the first direction and the second direction, and distances between the first luminescent materials of adjacent two identical colors are alternately arranged in a size-to-size manner.
3. 3. The display panel according to claim 1, wherein distances between adjacent two first luminescent materials of the same color are equal along the first direction and the second direction, and distances between the first pixel defining openings corresponding to the adjacent two first luminescent materials of the same color are alternately arranged in a size-by-size manner.
4. 4. The display panel of claim 1, wherein the first repeating unit is centrally symmetric about the first center.
5. 5. The display panel according to claim 1, wherein the first repeating units are axisymmetric along the first direction and/or the second direction, respectively.
6. 6. The display panel of claim 1, wherein a difference between a width of the first non-light emitting region of the first light emitting material away from the first center and a width of the first non-light emitting region near the first center is 2-6 μm.
7. 7. The display panel of claim 1, further comprising: A first electrode layer located at one side of the first pixel defining layer; a second electrode layer located on a different side of the first pixel defining layer from the first electrode layer; A second light emitting unit layer, the first light emitting unit layer and the second light emitting unit layer being located between the first electrode layer and the second electrode layer; Wherein the second light emitting unit layer includes a plurality of second light emitting materials, each of which overlaps one of the first light emitting materials in a plan view.
8. 8. A method for manufacturing a display panel, comprising: Providing a first substrate; preparing a first pixel defining layer on one side of the first substrate, wherein the first pixel defining layer comprises a plurality of first pixel defining openings; Providing a mask plate, and evaporating a first light-emitting unit layer on one side, away from the first substrate, of the first pixel definition layer through the mask plate; Wherein the first light emitting unit layer comprises a plurality of first light emitting materials including a first light emitting region and a first non-light emitting region surrounding the first light emitting region, each of the first light emitting regions covering one of the first pixel defining openings in a plan view; Taking four adjacent first luminescent materials with the same color as a first repeating unit, wherein the first repeating unit comprises two adjacent first luminescent materials with the same color along a first direction and two adjacent first luminescent materials with the same color along a second direction, and the first direction is intersected with the second direction; In the first repeating unit, four of the first luminescent materials have a first center, and the width of the first non-luminescent region of the first luminescent material near the first center is smaller than the width far from the first center; In each first repeating unit, a first anode via corresponding to each first luminescent material is located at a position, far from the first center, of the first non-luminescent region of the first luminescent material, and four first anode vias are centrosymmetric.
9. 9. A display device comprising the display panel according to any one of claims 1 to 7.
10. 10. A display panel, comprising: a second substrate; a second pixel defining layer located at one side of the second substrate, the second pixel defining layer including a plurality of second pixel defining openings; A third light emitting unit layer located at a side of the second pixel defining layer facing away from the second substrate, the third light emitting unit layer including a plurality of third light emitting materials including a second light emitting region and a first compensation region surrounding the second light emitting region, each of the third light emitting materials covering one of the second pixel defining openings in a plan view; wherein the adjacent four third luminescent materials with the same color are taken as a second repeating unit, and the second repeating unit comprises the adjacent two third luminescent materials with the same color along a third direction and the adjacent two third luminescent materials with the same color along a fourth direction, wherein the third direction intersects with the fourth direction; In the second repeating unit, four of the third luminescent materials have a second center, and the first compensation regions of the four third luminescent materials are center-symmetrical based on the second center; Each third luminescent material comprises four first compensation regions and a redundant region, the first compensation regions are not communicated with the second luminescent regions, the redundant region is positioned between the second luminescent regions and the first compensation regions, the width of the first compensation regions from the second luminescent regions is larger than the width of the redundant regions from the second luminescent regions, and the four first compensation regions are centrosymmetric; Or each third luminescent material comprises four first compensation areas and redundant areas, the first compensation areas are communicated with the second luminescent areas, the redundant areas encircle the first compensation areas, the redundant areas are positioned on the outermost periphery of the whole third luminescent material and encircle the second luminescent areas and the first compensation areas, and the four first compensation areas are centrosymmetric.
11. 11. The display panel according to claim 10, characterized in that in the second repeating unit the first compensation areas of four of the third luminescent materials are also axisymmetric in the third direction and/or the fourth direction, respectively.
12. 12. The display panel of claim 10, wherein when the first compensation region is not in communication with the second light-emitting region, a ratio of a width of the first compensation region to an equivalent diameter of the second light-emitting region in the third light-emitting material is in a range of 5% -30%.
13. 13. The display panel according to claim 10, wherein when the first compensation region is in communication with the second light emitting region, the second pixel defining opening includes a body region overlapping the second light emitting region in a plan view and four second compensation regions overlapping the second compensation region in a plan view.
14. 14. The display panel of claim 13, wherein when the first compensation region is in communication with the second light emitting region, a ratio of a width of the second compensation region to an equivalent diameter of the body region in the second pixel defining opening region ranges from 5% to 30%.
15. 15. The display panel according to claim 10, wherein in each of the second repeating units, the second anode via of the third light emitting material is located in the first compensation region in a plan view, and four of the second anode vias are center-symmetrical.
16. 16. The display panel according to claim 10, wherein the width of the first compensation region of the third light emitting material is 2-6 μm.
17. 17. The display panel of claim 10, further comprising: a third electrode layer located at one side of the second pixel defining layer; a fourth electrode layer located on a different side of the second pixel defining layer from the third electrode layer; a fourth light emitting unit layer, the third light emitting unit layer and the fourth light emitting unit layer being located between the third electrode layer and the fourth electrode layer; wherein the fourth light emitting unit layer includes a plurality of fourth light emitting materials, each of which overlaps one of the third light emitting materials in a plan view.
18. 18. A method for manufacturing a display panel, comprising: Providing a second substrate; Preparing a second pixel defining layer on one side of the second substrate, wherein the second pixel defining layer includes a plurality of second pixel defining openings; Providing a mask plate, and evaporating a third light-emitting unit layer on one side, away from the second substrate, of the second pixel definition layer through the mask plate; Wherein the third light emitting unit layer includes a plurality of third light emitting materials including a second light emitting region and a first compensation region surrounding the second light emitting region, each of the third light emitting materials covering one of the second pixel defining openings in a plan view; Taking the adjacent four third luminescent materials with the same color as a second repeating unit, wherein the second repeating unit comprises two adjacent third luminescent materials with the same color along a third direction and two adjacent third luminescent materials with the same color along a fourth direction, and the third direction is intersected with the fourth direction; In the second repeating unit, four of the third luminescent materials have a second center, and the first compensation regions of the four third luminescent materials are center-symmetrical based on the second center; Each third luminescent material comprises four first compensation regions and a redundant region, the first compensation regions are not communicated with the second luminescent regions, the redundant region is positioned between the second luminescent regions and the first compensation regions, the width of the first compensation regions from the second luminescent regions is larger than the width of the redundant regions from the second luminescent regions, and the four first compensation regions are centrosymmetric; Or each third luminescent material comprises four first compensation areas and redundant areas, the first compensation areas are communicated with the second luminescent areas, the redundant areas encircle the first compensation areas, the redundant areas are positioned on the outermost periphery of the whole third luminescent material and encircle the second luminescent areas and the first compensation areas, and the four first compensation areas are centrosymmetric.
19. 19. A display device comprising the display panel according to any one of claims 10 to 17.

Description

Display panel, preparation method of display panel and display device Technical Field The invention relates to the field of display panels, in particular to a display panel, a preparation method of the display panel and a display device. Background In an OLED (Organic Light-Emitting Diode) display panel, an RGB (red, green and blue) Light Emitting layer is prepared by a vacuum thermal evaporation process. In the evaporation process, the organic luminescent material is heated to a sublimated or evaporated state, so that it is deposited on a specified area on the substrate in a vacuum environment. This process requires the use of a metal mask to achieve spatially selective deposition of RGB luminescent materials. However, in the vapor deposition preparation process of the RGB light emitting layer, since there may be a problem of misalignment between the metal mask plate and the substrate, the RGB light emitting material cannot be precisely deposited on the target position. The misalignment may cause a color mixing phenomenon in the crossing region between the RGB sub-pixels, thereby affecting the display image quality. Disclosure of Invention In view of this, the present invention provides a display panel, a method for manufacturing the display panel, and a display device, so as to at least solve the problem that the risk of color mixing of different colors of luminescent materials is high due to misalignment of a mask plate during vapor deposition of the luminescent materials of the display panel. In one aspect, the embodiment of the invention provides a display panel, which comprises a first substrate, a first pixel definition layer, a first light emitting unit layer and four first light emitting units, wherein the first pixel definition layer is positioned on one side of the first substrate, the first pixel definition layer comprises a plurality of first pixel definition openings, the first light emitting unit layer is positioned on one side of the first pixel definition layer, which faces away from the first substrate, the first light emitting unit layer comprises a plurality of first light emitting materials, the first light emitting materials comprise a first light emitting area and a first non-light emitting area, the first non-light emitting area surrounds the first light emitting area, each first light emitting area covers one first pixel definition opening in a plan view, four first light emitting materials with the same color are used as first repeating units, the first repeating units comprise two first light emitting materials with the same color, which are adjacent in a first direction, and two first light emitting materials with the same color, which are adjacent in a second direction, the first direction intersects the second direction, and the width of the four first light emitting materials in the first repeating units, which is close to the first non-light emitting area, is smaller than the width of the first light emitting area, which is far away from the first light emitting area. On the other hand, the embodiment of the invention further provides a preparation method of the display panel, which comprises the steps of providing a first substrate, preparing a first pixel definition layer on one side of the first substrate, wherein the first pixel definition layer comprises a plurality of first pixel definition openings, providing a mask plate, evaporating a first light emitting unit layer on one side, away from the first substrate, of the first pixel definition layer through the mask plate, wherein the first light emitting unit layer comprises a plurality of first light emitting materials, the first light emitting materials comprise a first light emitting area and a first non-light emitting area, the first non-light emitting area surrounds the first light emitting area, each first light emitting area covers one first pixel definition opening in a plan view, the adjacent four first light emitting materials with the same color are used as first repeating units, each first repeating unit comprises two first light emitting materials with the same color and two first light emitting materials with the same color, which are adjacent in a first direction, and the first direction intersects the second direction, and in the first repeating units, the four first light emitting materials have a first center, and the first width of the first light emitting materials is smaller than the first light emitting material is close to the first center. In yet another aspect, an embodiment of the present invention further provides a display device including the display panel described above. According to the display panel, the preparation method of the display panel and the display device, two and four total first luminescent materials with the same color along the first direction and the second direction are taken as the first repeating unit, and the positions of the four first luminescent materials are close