Display panel

Abstract

The application discloses a display panel, which comprises an array substrate, a pixel definition layer arranged on the array substrate, and a color film layer located on a side of the pixel definition layer away from the array substrate, wherein the color film layer comprises a light shielding layer, and the light shielding layer is provided with a first concave-convex structure on at least one surface in a thickness direction of the light shielding layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel. BACKGROUND

[0002] In the field of display, Organic Light Emitting Diode (OLED) display device has faster response than liquid crystal display device, and has the advantages of bright color and thinness, so OLED display device becomes the mainstream technology of next generation display. However, OLED display device has the problem of low contrast, which affects its display effect.

[0003] Therefore, it is necessary to provide a technical scheme to improve the contrast of OLED display device and improve its display effect. SUMMARY

[0004] The present application aims to provide a display panel to improve the contrast of the display panel when displaying.

[0005] To achieve the above-mentioned purpose, the technical scheme is as follows:

[0006] A display panel, comprising:

[0007] An array substrate;

[0008] A pixel definition layer disposed on the array substrate; and

[0009] A color film layer located on the side of the pixel definition layer away from the array substrate, the color film layer comprising a light shielding layer, the light shielding layer being provided with a first concave-convex structure on at least one surface of the light shielding layer in the thickness direction.

[0010] In some embodiments of the display panel, the pixel definition layer comprises a black material, and the surface of the pixel definition layer close to the color film layer is provided with a second concave-convex structure.

[0011] In some embodiments of the display panel, the shape of the first concave-convex structure is different from the shape of the second concave-convex structure.

[0012] In some embodiments of the display panel, the first concave-convex structure is provided on the surface of the light shielding layer close to the pixel definition layer.

[0013] In some embodiments of the display panel, the pixel definition layer is in contact with the light shielding layer, and at least part of the first concave-convex structure is in contact with at least part of the second concave-convex structure and engages with each other.

[0014] In some embodiments of the display panel, the display panel further comprises:

[0015] An encapsulation substrate is disposed opposite to the array substrate, and is located on a side of the color filter layer away from the array substrate, and the color filter layer is in contact with a surface of the encapsulation substrate close to the array substrate.

[0016] In some embodiments of the display panel, the surface of the light-blocking layer in contact with the encapsulation substrate is flat.

[0017] In some embodiments of the display panel, the light-blocking layer comprises a light-blocking opening, and the color filter layer further comprises a color-resistance unit, the color-resistance unit being disposed in the light-blocking opening.

[0018] The pixel definition layer further comprises a pixel opening, and the display panel further comprises a light-emitting unit, a portion of the light-emitting unit being disposed in the pixel opening.

[0019] In some embodiments of the display panel, a minimum value of an opening area of the light-blocking opening is greater than a maximum value of an opening area of the pixel opening.

[0020] In some embodiments of the display panel, the light-blocking layer comprises a plurality of first grooves arranged at intervals, the plurality of first grooves being recessed from a surface of the light-blocking layer close to the pixel definition layer to a surface of the light-blocking layer away from the pixel definition layer, a depth of the plurality of first grooves being less than a thickness of the light-blocking layer, the first grooves constituting recessed portions of a first concave-convex structure, and portions of the light-blocking layer between the plurality of first grooves arranged at intervals constituting convex portions of the first concave-convex structure.

[0021] Beneficial effects: Since the light-blocking layer is provided with the first concave-convex structure on at least one surface of the light-blocking layer in the thickness direction, the first concave-convex structure diffusely reflects ambient light incident on the display panel, thereby reducing specular reflection, and the first concave-convex structure increases the amount of absorption of ambient light by the light-blocking layer, reduces the reflectivity of ambient light on the display panel, and thereby improves the contrast ratio when the display panel displays, so as to improve the display effect of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a cross-sectional schematic view of a display panel according to an embodiment of the present application;

[0023] Figure 2 FIG. 2 is a partial plan view of the light-blocking layer shown in FIG. 1; Figure 1

[0024] Figure 3 FIG. 3 is a cross-sectional schematic view of a display panel according to another embodiment of the present application;

[0025] Figure 4 FIG. 4 is a partial plan view of the pixel definition layer in the display panel shown in FIG. 3; and Figure 3 FIG. 5 is a partial plan view of the light-blocking layer in the display panel shown in FIG. 3.​

[0026] Figure 5 A cross-sectional schematic view of a display panel according to another embodiment of the present application.

[0027] Reference signs:

[0028] 100, display panel;

[0029] 10, array substrate; 101, substrate; 102, array layer;

[0030] 20, pixel definition layer; 201, pixel opening; 202, dam; 203, second concave-convex structure; 204, second groove;

[0031] 30, color film layer; 301, light shielding layer; 3011, light shielding opening; 3012, light shielding matrix; 3013, first concave-convex structure; 3014, first groove; 302, color resistance unit;

[0032] 40, light emitting unit; 401, anode; 402, organic light emitting layer; 403, cathode;

[0033] 50, encapsulation substrate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] Please refer to Figure 1 which is a cross-sectional schematic view of a display panel according to an embodiment of the present application. The display panel 100 includes an array substrate 10, a pixel definition layer 20, a color film layer 30, a light emitting unit 40, and an encapsulation substrate 50.

[0036] In the present embodiment, the array substrate 10 includes a substrate 101 and an array layer 102, and the array layer 102 is disposed on the substrate 101. The substrate 101 is a glass substrate, but is not limited thereto, and the substrate 101 can also be a flexible substrate. The array layer 102 includes a plurality of driving circuit units (not shown), and each driving circuit unit includes at least one thin film transistor.

[0037] In the embodiment, the pixel definition layer 20 is disposed on the array substrate 10. The pixel definition layer 20 includes a pixel opening 201 and a dam 202. The pixel opening 201 is used to define a light-emitting area of the display panel 100, and the pixel opening 201 penetrates the pixel definition layer 20 along a thickness direction of the pixel definition layer 20. The dam 202 is disposed around the pixel opening 201. A cross section of the pixel opening 201 along the thickness direction of the pixel definition layer 20 is in the shape of an inverted trapezoid.

[0038] The color of the pixel definition layer 20 is transparent or yellow. The thickness of the pixel definition layer 20 is greater than or equal to 1.5 microns and less than or equal to 2.5 microns, for example, 1.8 microns, 2.0 microns, 2.2 microns, or 2.5 microns. The material of the pixel definition layer 20 includes but is not limited to polyimide.

[0039] In the embodiment, at least part of the light-emitting unit 40 is disposed in the pixel opening 201, and each light-emitting unit 40 is electrically connected to a driving circuit unit, so that the driving circuit unit drives the light-emitting unit 40 to emit light. The light-emitting unit 40 is an organic light-emitting diode, but is not limited thereto, and the light-emitting unit 40 can also be any one of a quantum dot light-emitting diode, a submillimeter light-emitting diode, and a micro light-emitting diode.

[0040] When the light-emitting unit 40 is an organic light-emitting diode, the light-emitting unit 40 includes an anode 401, an organic light-emitting layer 402, and a cathode 403, and the organic light-emitting layer 402 is disposed between the anode 401 and the cathode 403. The anode 401 is disposed on a surface of the array layer 102 of the array substrate 10, the dam 202 of the pixel definition layer 20 covers the edges of the anode 401 and the array layer 102, the organic light-emitting layer 402 is located in the pixel opening 201 and on the anode 401, and the cathode 403 is located on a surface of the organic light-emitting layer 402 away from the anode 401.

[0041] It can be understood that the light-emitting unit 40 can further include at least one of a hole transport layer and a hole injection layer between the anode 401 and the organic light-emitting layer 402, and the light-emitting unit 40 can further include at least one of an electron transport layer and an electron injection layer between the cathode 403 and the organic light-emitting layer 402.

[0042] It should be noted that the organic light-emitting layer 402 and the functional layer are formed in the pixel opening 201 by an inkjet printing or evaporation process, and the functional layer includes but is not limited to at least one of a hole transport layer, a hole injection layer, an electron transport layer, and an electron injection layer.

[0043] In the embodiment, the color filter layer 30 is located on a side of the pixel definition layer 20 away from the array substrate 10. The color filter layer 30 includes a light-blocking layer 301 and a plurality of color resistance units 302, and the light-blocking layer 301 is in contact with the dam 202 of the pixel definition layer 20.

[0044] It can be understood that, in other embodiments, a thin film encapsulation layer can also be arranged between the color film layer 30 and the pixel definition layer 20, and the thin film encapsulation layer includes two inorganic insulation layers and an organic insulation layer between the two inorganic insulation layers.

[0045] The light shielding layer 301 is a black organic layer. The thickness of the light shielding layer 301 is greater than or equal to 1.5 microns and less than or equal to 3.5 microns, for example, 1.8 microns, 2.5 microns, 2.8 microns, 3 microns, or 3.5 microns.

[0046] The light shielding layer 301 includes a plurality of spaced light shielding openings 3011 and a light shielding matrix 3012. The plurality of light shielding openings 3011 penetrate the light shielding layer 301 along the thickness direction of the light shielding layer 301, and the remaining light shielding layer 301 constitutes the light shielding matrix 3012.

[0047] The minimum value of the opening area of the light shielding opening 3011 is greater than the maximum value of the opening area of the pixel opening 201, so as to avoid mutual crosstalk between different colors of light emitted by the plurality of light emitting units 40 while ensuring the light extraction efficiency of the light emitted by the light emitting unit 40.

[0048] The plurality of color resistance units 302 are arranged one-to-one in the plurality of light shielding openings 3011. Part of each color resistance unit 302 is in contact with the dam 202 of the pixel definition layer 20. The plurality of color resistance units 302 include red color resistance, blue color resistance, and green color resistance.

[0049] In this embodiment, the light shielding layer 301 is provided with a first concave-convex structure 3013 on at least one surface of the light shielding layer 301 in the thickness direction of the light shielding layer 301. The first concave-convex structure 3013 diffusely reflects the ambient light H incident on the display panel 100, thereby reducing specular reflection, and the first concave-convex structure 3013 increases the absorption amount of the ambient light H by the light shielding layer 301, reduces the reflectivity of the ambient light H on the display panel 100, and thereby improves the contrast ratio when the display panel 100 displays, so as to improve the display effect of the display panel 100.

[0050] Specifically, the first concave-convex structure 3013 is arranged on the surface of the light shielding layer 301 close to the pixel definition layer 20, so that the first concave-convex structure 3013 can diffusely reflect the ambient light H incident into the light shielding layer 301 and increase the absorption amount of the ambient light H by the light shielding layer 301.

[0051] It can be understood that the first concave-convex structure 3013 can also be arranged on the surface of the light shielding layer 301 away from the pixel definition layer 20, so that the first concave-convex structure 3013 reflects the ambient light H incident on the surface of the light shielding layer 301 away from the pixel definition layer 20.

[0052] Please refer toFigure 2 which is Figure 1 A partial plan view of the light shielding layer is shown in FIG. 3. The light shielding layer 301 includes a plurality of first grooves 3014 arranged at intervals, the plurality of first grooves 3014 being recessed from the surface of the light shielding layer 301 close to the pixel defining layer 20 to the surface of the light shielding layer 301 away from the pixel defining layer 20, and the depth of the plurality of first grooves 3014 being less than the thickness of the light shielding layer 301.

[0053] The first grooves 3014 constitute recessed portions of the first concave-convex structure 3013, and the portions of the light shielding layer 301 between the plurality of first grooves 3014 arranged at intervals constitute convex portions of the first concave-convex structure 3013.

[0054] The periphery of each light shielding opening 3011 is provided with a plurality of first grooves 3014 arranged at intervals, so that the periphery of each light shielding opening 3011 is provided with a plurality of first concave-convex structures 3013, to better diffuse and absorb the ambient light H incident on the light shielding layer 301.

[0055] The cross-sectional shape of each first groove 3014 in a direction perpendicular to the thickness of the light shielding layer 301 includes, but is not limited to, at least one of a rectangle, a circle, and an ellipse. The cross-sectional shape of each first groove 3014 in the direction of the thickness of the light shielding layer 301 includes, but is not limited to, at least one of a semicircle, a semi-ellipse, a rectangle, a triangle, a trapezoid, and an inverted trapezoid.

[0056] It should be noted that the first grooves 3014 are obtained by plasma treatment or surface etching treatment.

[0057] In the present embodiment, the encapsulation substrate 50 is arranged opposite to the array substrate 10, and the array substrate 10 and the encapsulation substrate 50 can be connected by a sealant. The encapsulation substrate 50 is a transparent glass substrate, but is not limited thereto, and the encapsulation substrate 50 can also be a transparent polymer substrate.

[0058] Specifically, the encapsulation substrate 50 is located on the side of the color filter layer 30 away from the array substrate 10, and the color filter layer 30 contacts the surface of the encapsulation substrate 50 close to the array substrate 10. The surface of the light shielding layer 301 contacting the encapsulation substrate 50 is flat, to ensure that the encapsulation substrate 50 can be arranged flat on the color filter layer 30, thereby ensuring the flatness of the display panel 100.

[0059] It should be noted that the color filter layer 30 is formed on the encapsulation substrate 50, and then the encapsulation substrate 50 provided with the color filter layer 30 is laminated with the array substrate 10 provided with the light emitting unit 40, to obtain the display panel 100.

[0060] Please refer to Figure 3 and Figure 4 , Figure 3FIG. 2 is a schematic view of a cross section of a display panel according to another embodiment of the present application, Figure 4 FIG. 3 is a schematic view of a cross section of a display panel according to another embodiment of the present application, Figure 3 FIG. 4 is a schematic view of a partial plan of a pixel definition layer in the display panel shown in FIG. 3.

[0061] Figure 3 FIG. 5 is a schematic view of a cross section of a display panel according to another embodiment of the present application, Figure 1 The display panel shown in FIG. 5 is substantially similar to the display panel shown in FIG. 3, and the same parts are not described again. The differences include that the pixel definition layer 20 comprises black material, and the surface of the pixel definition layer 20 close to the color filter layer 30 is provided with a second concave-convex structure 203, so that the pixel definition layer 20 can diffuse the ambient light H incident on the pixel definition layer 20 from the light shielding opening 3011, and the second concave-convex structure 203 increases the absorption of the ambient light H by the pixel definition layer 20, further reduces the reflectivity of the display panel 100 to the ambient light H, and further improves the contrast of the display panel 100 when displaying.

[0062] It should be noted that the black material includes but is not limited to carbon black. The pixel definition layer 20 can be a positive photoresist layer comprising black material prepared after exposure, development and etching, or a negative photoresist layer comprising black material prepared after exposure, development and etching.

[0063] In this embodiment, the shape of the first concave-convex structure 3013 is different from the shape of the second concave-convex structure 203, so that the first concave-convex structure 3013 and the second concave-convex structure 203 respectively diffuse the ambient light H irregularly, further reducing the reflectivity of the display panel 100 to the ambient light H.

[0064] It can be understood that the shape of the first concave-convex structure 3013 can be the same as the shape of the second concave-convex structure 203.

[0065] In this embodiment, the pixel definition layer 20 comprises a plurality of second grooves 204 arranged at intervals, the plurality of second grooves 204 are recessed from the surface of the pixel definition layer 20 close to the color filter layer 30 to the surface of the pixel definition layer 20 away from the color filter layer 30, and the depth of the second grooves 204 is less than the thickness of the pixel definition layer 20. The second grooves 204 constitute recessed parts of the second concave-convex structure 203, and the parts of the pixel definition layer 20 between the plurality of second grooves 204 constitute convex parts of the second concave-convex structure 203.

[0066] It should be noted that the second grooves 204 are also obtained by plasma treatment or surface etching treatment.

[0067] The periphery of each pixel opening 201 is provided with a plurality of second grooves 204 arranged at intervals, and the second grooves 204 are arranged one-to-one with the first grooves 3014 to ensure that the light shielding layer 301 is arranged flat on the pixel definition layer 20, thereby ensuring that the packaging substrate 50 can be arranged flat, thereby ensuring the flatness of the display panel 100.

[0068] The area of the top opening of the first groove 3014 is different from the area of the top opening of the second groove 204, which is conducive to better one-to-one correspondence between the first groove 3014 and the second groove 204. For example, the area of the top opening of the first groove 3014 is greater than the area of the top opening of the second groove 204, or the area of the top opening of the first groove 3014 is less than the area of the top opening of the second groove 204.

[0069] It should be noted that the top opening of the first groove 3014 is the opening of the first groove 3014 close to the pixel definition layer 20, and the top opening of the second groove 204 is the opening of the second groove 204 close to the light shielding layer 301.

[0070] The cross-sectional shape of each second groove 204 in the direction perpendicular to the thickness of the pixel definition layer 20 includes but is not limited to at least one of a rectangle, a circle, and an ellipse. The cross-sectional shape of each second groove 204 in the direction of the thickness of the pixel definition layer 20 includes but is not limited to at least one of a semicircle, a semi-ellipse, a rectangle, a triangle, a trapezoid, and an inverted trapezoid.

[0071] In this embodiment, the shape of the first groove 3014 is different from the shape of the second groove 204, so that the shape of the first concave-convex structure 3013 is different from the shape of the second concave-convex structure 203. For example, the first groove 3014 is semispherical, and the second groove 204 is quadrangular prism-shaped, but is not limited thereto.

[0072] Please refer to Figure 5 which is a cross-sectional schematic view of a display panel of another embodiment of the present application. Figure 5 The display panel shown is substantially similar to Figure 3 The display panel shown is substantially similar to the display panel shown in FIG. 1, and the same parts will not be described again. The difference is that at least part of the first concave-convex structure 3013 is in contact with and engages with at least part of the second concave-convex structure 203, so that the light shielding layer 301 is arranged flat on the pixel definition layer 20 while reducing the gap between the pixel definition layer 20 and the light shielding layer 301, thereby reducing the risk of light emitted by the light emitting unit 40 leaking out of the gap and causing side light leakage.

[0073] Specifically, the first concave-convex structure 3013 and the second concave-convex structure 203 are in contact and interlock, so that the light shielding layer 301 is arranged flat on the pixel definition layer 20 while reducing the gap between the pixel definition layer 20 and the light shielding layer 301, and reducing the risk of light emitted by the light emitting unit 40 leaking out of the gap to cause side light leakage.

[0074] In the present embodiment, the recessed portions of the first concave-convex structure 3013 interlock with the protruding portions of the second concave-convex structure 203, and the protruding portions of the first concave-convex structure 3013 interlock with the recessed portions of the second concave-convex structure 203.

[0075] It should be noted that the first concave-convex structure 3013 is obtained by forming first grooves 3014 on the light shielding layer 301, the first grooves 3014 being the recessed portions of the first concave-convex structure 3013, and the portions of the light shielding layer 301 between the first grooves 3014 and protruding from the first grooves 3014 being the protruding portions of the first concave-convex structure 3013. In addition, the second concave-convex structure 203 is obtained by forming second grooves 204 on the pixel definition layer 20, the second grooves 204 constituting the recessed portions of the second concave-convex structure 203, and the portions of the pixel definition layer 20 between the second grooves 204 and protruding from the second grooves 204 constituting the protruding portions of the second concave-convex structure 203.

[0076] For example, the recessed portions of the first concave-convex structure 3013 are in the shape of a triangular pyramid, and the protruding portions of the second concave-convex structure 203 are also in the shape of a triangular pyramid. It can be understood that the first concave-convex structure 3013 and the second concave-convex structure 203 can also both be in the shape of a sawtooth or a dam.

[0077] The above description of the embodiments is only used to help understand the technical solutions of the present application and its core idea; those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized by, The display panel comprises: an array substrate; a pixel definition layer disposed on the array substrate and comprising a black material; and a color film layer located on a side of the pixel definition layer away from the array substrate, the color film layer comprising a light shielding layer, the pixel definition layer being in contact with the light shielding layer, a lower surface of the light shielding layer being provided with a first concave-convex structure, the lower surface of the light shielding layer being a surface of the light shielding layer close to the pixel definition layer; wherein a surface of the pixel definition layer close to the color film layer is provided with a second concave-convex structure, the shape of the first concave-convex structure being different from the shape of the second concave-convex structure.

2. The display panel of claim 1, wherein, The thickness of the light shielding layer is greater than or equal to 1.5 microns and less than or equal to 3.5 microns.

3. The display panel of claim 1, wherein, The light shielding layer comprises a plurality of first grooves arranged at intervals, the plurality of first grooves being recessed from a surface of the light shielding layer close to the pixel definition layer to a surface of the light shielding layer away from the pixel definition layer, the first grooves constituting recessed portions of the first concave-convex structure, portions of the light shielding layer located between the plurality of first grooves arranged at intervals constituting convex portions of the first concave-convex structure; The pixel definition layer comprises a plurality of second grooves arranged at intervals, the plurality of second grooves being recessed from a surface of the pixel definition layer close to the color film layer to a surface of the pixel definition layer away from the color film layer, the second grooves constituting recessed portions of the second concave-convex structure, portions of the pixel definition layer located between the plurality of second grooves constituting convex portions of the second concave-convex structure.

4. The display panel of claim 3, wherein, The area of the top opening of the first grooves is different from the area of the top opening of the second grooves.

5. The display panel of claim 1, wherein, At least part of the first concave-convex structure is in contact with and engages with at least part of the second concave-convex structure.

6. The display panel of any of claims 1-5, wherein, The display panel further comprises: an encapsulation substrate disposed opposite the array substrate, located on a side of the color film layer away from the array substrate, and the color film layer being in contact with a surface of the encapsulation substrate close to the array substrate.

7. The display panel of claim 6, wherein, The surface of the light shielding layer in contact with the encapsulation substrate is flat.

8. The display panel of claim 3, wherein, The light shielding layer comprises a light shielding opening, and the color film layer further comprises a color resist unit, the color resist unit being disposed in the light shielding opening; The pixel definition layer further comprises a pixel opening, and the display panel further comprises a light emitting unit, at least part of the light emitting unit being disposed in the pixel opening.

9. The display panel according to claim 8, wherein: The minimum value of the opening area of the light shielding opening is greater than the maximum value of the opening area of the pixel opening.

10. The display panel of claim 8, wherein, The depth of the plurality of first grooves is less than the thickness of the light shielding layer, and each of the light shielding openings is provided with a plurality of first grooves arranged at intervals; The depth of the second grooves is less than the thickness of the pixel definition layer, and each of the pixel openings is provided with a plurality of second grooves arranged at intervals.

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