CN115734647A

CN115734647A - Display panel, manufacturing method thereof and display device

Info

Publication number: CN115734647A
Application number: CN202211517680.5A
Authority: CN
Inventors: 胡峻霖; 杨志文; 刘雪; 邢汝博; 应文涛
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-03-03

Abstract

The application relates to a display panel, which comprises a first optical function layer and a second optical function layer, wherein the first optical function layer comprises a plurality of optical pattern parts, and the optical pattern parts are arranged in one-to-one correspondence with at least part of light-emitting elements; the second optical function layer is arranged on one side, far away from the display layer group, of the first optical function layer in a laminated mode, and the orthographic projection of the second optical function layer on the substrate covers the orthographic projection of the first optical function layer on the substrate; the refractive index of the first optical functional layer is greater than the refractive index of the second optical functional layer. When light (oblique light emitted by the light-emitting element) passes through the first optical function layer with higher refractive index and is incident into the second optical function layer, refraction occurs, so that the oblique light is converted into light which tends to a normal viewing angle, namely, the light is close to the center of the light-emitting element, the convergence effect of the display light is achieved, and the display brightness of the display panel is improved. A manufacturing method of the display panel and a display device are also provided.

Description

Display panel, manufacturing method thereof and display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display panel, a manufacturing method thereof, and a display device.

Background

OLED (Organic Light-Emitting Diode) display panels are increasingly widely used due to their advantages of self-luminescence, high contrast, flexibility, etc.

The light emitted by the light emitting element of the OLED display panel passes through the plurality of films before reaching the light emitting surface of the display panel, and each film has a certain absorption effect on the light, so that the brightness of the light reaching the light emitting surface is reduced, the display brightness of the display panel is affected, and the display effect of the display panel is further affected.

Disclosure of Invention

Accordingly, it is desirable to provide a display panel capable of improving the display luminance of the display panel.

According to an aspect of the present application, there is provided a display panel including:

a substrate;

a display layer group arranged on the substrate, wherein the display layer group comprises a plurality of light-emitting elements; and

an optical function layer group located on a side of the display layer group facing away from the substrate, the optical function layer group including:

the first optical function layer comprises a plurality of optical pattern parts, and the optical pattern parts are arranged in one-to-one correspondence with at least part of the light-emitting elements;

a second optical function layer which is arranged on the side, far away from the display layer group, of the first optical function layer in a laminated mode, wherein the orthographic projection of the second optical function layer on the substrate covers the orthographic projection of the first optical function layer on the substrate;

the refractive index of the first optically functional layer is greater than the refractive index of the second optically functional layer.

Above-mentioned display panel, because the refracting index of first optical function layer is greater than the refracting index of second optical function layer, consequently, when light (the slant light that light emitting component emitted) penetrated the first optical function layer that has higher refracting index and kicked into the second optical function layer and has taken place the refraction for the slant light becomes the light that more tends to normal viewing angle, and light draws close to light emitting component's center promptly, thereby has reached the convergence effect that shows light, and then has improved display panel's demonstration luminance.

In one embodiment, the optical pattern portion includes a middle portion and an edge portion surrounding the middle portion, and the thickness of the edge portion decreases in a direction from the middle portion to the edge portion.

In one embodiment, an orthographic projection of the edge portion on the substrate is offset from the light emitting element.

In one embodiment, the thickness of the edge portion decreases continuously in the direction from the middle portion to the edge portion to form a slope on the side of the edge portion facing away from the substrate.

In one embodiment, the thickness of the middle part is uniformly set, and one side surface of the edge part, which faces away from the substrate, is configured as an arc slope surface which is convex outwards.

In one embodiment, the range γ of the slope angle of the slope surface satisfies the condition: gamma is more than or equal to 15 degrees and less than or equal to 50 degrees.

In one embodiment, the thickness of the edge portion becomes continuously smaller in a direction from the middle portion toward the edge portion;

one side surface of the optical pattern part, which deviates from the substrate, is constructed into an arc-shaped surface which is convex outwards.

In one embodiment, the orthographic projection of the optical pattern part on the substrate covers the orthographic projection of the light-emitting element arranged corresponding to the optical pattern part on the substrate.

In one embodiment, the display layer group includes a pixel defining layer defining a plurality of pixel opening areas and a non-opening area surrounding the pixel opening areas, the light emitting elements being disposed at the pixel opening areas;

the orthographic projection of the optical pattern part on the substrate covers the orthographic projection of the corresponding pixel opening area on the substrate, and has overlap with the orthographic projection of the non-opening area on the substrate.

In one embodiment, the second optically functional layer directly covers a side surface of the first optically functional layer facing away from the display layer group.

In one embodiment, the display panel further includes a color-resist layer group, the color-resist layer group is located on a side of the display layer group facing away from the substrate, and the color-resist layer group includes:

the light shading resistance layer is provided with a plurality of first openings, and the first openings are arranged corresponding to at least part of the light emitting elements one to one;

a plurality of color filters arranged in the first openings;

wherein the color filter is located on a side of the second optical function layer facing away from the display layer group; or alternatively

The light filtering color resistance is positioned between the corresponding optical pattern part and the second optical function layer, and the refractive index of the optical pattern part is greater than that of the light filtering color resistance.

In one embodiment, each first opening is directly opposite to the corresponding light emitting element, and the minimum distance between the orthographic projection edge of the light emitting element on the substrate and the orthographic projection edge of the corresponding optical pattern part on the substrate is a first distance L1;

the minimum distance from the orthographic projection edge of the first opening on the substrate is a second distance L2;

wherein the first distance and the second distance satisfy a condition: l1 is less than L2.

In one embodiment, the range of the first distance is: l1 is more than or equal to 1 micron and less than or equal to 5 microns; the range of the second distance is:

l2 is more than or equal to 5 microns and less than or equal to 9 microns.

In one embodiment, the display panel further comprises an encapsulation layer between the display layer group and the optical function layer group;

and the refractive index of the first optical function layer is less than or equal to that of the packaging layer.

According to another aspect of the present application, there is provided a method for manufacturing a display panel, including:

providing a substrate;

sequentially forming a display layer group and an optical function layer group on the substrate; the display layer group comprises a plurality of light-emitting elements, the optical function layer group is positioned on one side of the display layer group, which is far away from the substrate, and the optical function layer group comprises a first optical function layer and a second optical function layer which is arranged on one side of the first optical function layer, which is far away from the display layer group in a laminated mode; the first optical function layer comprises a plurality of optical pattern parts, and the optical pattern parts are arranged in one-to-one correspondence with at least part of the light-emitting elements; the orthographic projection of the second optical function layer on the substrate covers the orthographic projection of the first optical function layer on the substrate; the refractive index of the first optically functional layer is greater than the refractive index of the second optically functional layer.

According to yet another aspect of the present application, there is provided a display device including the display panel according to any one of the above embodiments.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

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

FIG. 2 is a schematic cross-sectional view of a display panel according to another embodiment of the present application;

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

FIG. 4 is a schematic cross-sectional view of the display panel shown in FIG. 3 with the second optically functional layer removed;

FIG. 5 is a schematic cross-sectional view of a display panel according to an embodiment of the present application;

FIG. 6 is a schematic cross-sectional view of the display panel of FIG. 5 with the second optically functional layer removed;

FIG. 7 is a schematic cross-sectional view of a display panel according to the related art;

FIG. 8 is a schematic partial cross-sectional view of a display panel in an embodiment of the related art;

FIG. 9 is a graph comparing the simulation effect of the gain of the display panel in the embodiment shown in FIG. 2 and FIG. 8;

fig. 10 is a schematic structural diagram of a thin film transistor of a display panel according to an embodiment of the present application;

FIG. 11 is a block diagram of a method for fabricating a display panel according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Where the terms "comprising," "having," and "including" are used herein, another component may be added unless a specific limiting term is used, such as "only," "consisting of 8230; \8230composition," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.

Further, in the specification, the phrase "plane distribution diagram" refers to a drawing when the target portion is viewed from above, and the phrase "sectional diagram" refers to a drawing when a section taken by vertically cutting the target portion is viewed from the side.

Furthermore, the drawings are not 1:1, and the relative sizes of the various elements in the drawings are drawn for illustration only and not necessarily to true scale.

With the rapid development of display technologies, compared with conventional liquid crystal display panels, the OLED display panel has the characteristics of high resolution, high color gamut, low power consumption, and the like, and is widely applied to people's lives. However, in the related art, after the light emitted from the light emitting element is output through the encapsulation layer and the like, the light has a specific directivity, and the utilization rate of light emitted from the screen is low and the color saturation is poor.

In view of the above, it is desirable to provide a display panel capable of improving the light extraction rate and thus the display brightness.

Hereinafter, the display panel in the embodiment of the present application will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of a display panel in an embodiment of the present application; FIG. 2 shows a schematic cross-sectional view of a display panel in another embodiment of the present application; fig. 3 shows a schematic cross-sectional view of a display panel in a further embodiment of the present application. In which only the structures associated with the embodiments of the present application are shown for the sake of convenience in description.

Referring to fig. 1-3, a display panel according to at least one embodiment of the present disclosure includes a substrate 10, a display layer group 20, and an optical function layer group (not shown).

The display layer group 20 is disposed on the substrate 10, and the display layer group 20 includes a plurality of light emitting elements 21. The optical function layer group is located on a side of the display layer group 20 facing away from the substrate 10, and includes a first optical function layer (not shown), and a second optical function layer 44 stacked on a side of the first optical function layer facing away from the display layer group 20. The first optical function layer comprises a plurality of optical pattern portions 42, the plurality of optical pattern portions 42 are arranged corresponding to at least part of the light-emitting elements 21 in a one-to-one mode, and the orthographic projection of the second optical function layer 44 on the substrate covers the orthographic projection of the first optical function layer on the substrate.

It should be noted that the one-to-one correspondence between the plurality of optical pattern portions 42 and at least some of the light emitting elements 21 means that the optical pattern portions 42 and at least some of the light emitting elements 21 are one-to-one correspondence in number, and the positions of the optical pattern portions 42 correspond to the positions of the light emitting elements 21, so that the light emitted by the light emitting elements 21 can be emitted through the optical pattern portions 42. For example, in one embodiment, the orthographic projection of the optical pattern portion 42 on the substrate 10 completely covers the orthographic projection of the light emitting element 21 provided corresponding thereto on the substrate 10. In this way, it is ensured as much as possible that the light emitted from the light emitting element 21 can sequentially exit through the optical pattern part 42 and the second optical function layer 44.

It should be noted that the stacking arrangement of the first optical function layer and the second optical function layer 44 means that the first optical function layer and the second optical function layer 44 may be stacked in direct contact, or may be stacked without direct contact, for example, a middle film layer is present between the first optical function layer and the second optical function layer 44. In summary, the second optically functional layer 44 is located on the side of the first optically functional layer facing away from the display layer group 20, for example, in one embodiment, as shown in fig. 1 and 2, the second optically functional layer 44 directly covers the first optically functional layer. In another embodiment, as shown in fig. 3-5, second optically functional layer 44 is located above the first optically functional layer, but does not directly cover the surface of the first optically functional layer facing away from display layer group 20.

In embodiments of the present application, the refractive index of the first optically functional layer is greater than the refractive index of the second optically functional layer 44. Since the refractive index of the first optical functional layer is greater than the refractive index of the second optical functional layer 44, as shown in fig. 1 and fig. 2, when light (oblique light emitted by the light emitting element 21) passes through the optical pattern portion 42 with a higher refractive index, the light is refracted, so that the oblique light is converted into light which tends to the normal viewing angle more, that is, the light approaches the central line of the light emitting element 21, thereby achieving the convergence effect of the display light, further improving the brightness of the normal viewing angle, and improving the display brightness of the display panel.

Illustratively, the material of the first optical function layer may be polytetrafluoroethylene or polystyrene, and the material of the second optical function layer 44 may be at least one of acrylic-based resin, epoxy resin, phenol resin, polyamide-based resin, polyimide-based resin, unsaturated polyester resin, or other material with a lower refractive index, such as fluoride.

It can be understood that the refractive index of the first optical functional layer is larger than that of the second optical functional layer 44, so that the refraction and convergence of light rays can be realized, the light-emitting rate of the display panel is improved to a certain degree, the brightness and the color of a forward visual angle are obviously improved, but the problem of lower brightness of a non-forward visual angle is unavoidable, when a display screen is watched from a large visual angle, the original color cannot be seen, only a blurred image can be seen, even all black or all white, and the user experience of a product is influenced.

Based on this, as shown in fig. 1 to 4, in some embodiments, the optical pattern part 42 includes a middle portion a and an edge portion B surrounding the middle portion a, and a thickness of the edge portion B is decreased in a direction from the middle portion a to the edge portion B. It should be understood that, when the thicknesses of the portions of the optical pattern portion 42 are the same, the transmittances of the portions are also the same, on this basis, because the optical path of the light emitted from the light emitting element 21 is shorter and the attenuation degree is smaller under the front viewing angle, and the optical path of the light emitted from the light emitting element 21 is larger and the attenuation degree is larger under the large viewing angle, the light emitted under the front viewing angle is emitted through the thicker middle portion a of the optical pattern portion 42, and the light emitted under the large viewing angle (side viewing angle) is emitted through the thinner edge portion B of the optical pattern portion 42, so that the light emitting brightness under the front viewing angle and the light emitting brightness under the large viewing angle can be kept consistent, so that the light emitting brightness observed by human eyes under the front viewing angle and the large viewing angle can be kept consistent, and the display quality of the display panel is improved.

In one embodiment, the orthographic projection of the edge portion B of the optical pattern portion 42 on the substrate 10 is offset from the light emitting element 21. Therefore, the edge part B with the large transmittance can further compensate the attenuation of a large degree caused by the optical path under the side visual angle, so that the brightness of the light emitted from the front visual angle and the side visual angle of the display panel can be kept consistent, and the uniformity of the display panel is ensured.

The thickness of the edge portion B is reduced in a direction from the middle portion a to the edge portion B, and the thickness of the edge portion B may be continuously reduced or may be intermittently reduced, but the thickness of the edge portion B is reduced as a whole. For example, the thickness of the edge portion B decreases continuously in the direction from the middle portion a to the edge portion B to form a slope 420 with an overall inclined trend on the side of the edge portion B facing away from the substrate 10. Therefore, the light-emitting brightness of different side visual angles is further kept consistent with the light-emitting brightness under the front visual angle, and the display quality of the display panel is improved.

In some embodiments, as shown in fig. 1 to 4, the thickness of the middle portion a of the optical pattern portion 42 is uniformly set, and the side surface of the edge portion B of the optical pattern portion 42 facing away from the substrate 10 is configured as an outwardly convex arc-shaped slope 420. Thus, on the one hand, the outgoing light at the front view angle or the small view angle is emitted through the intermediate portion a, and the outgoing light at the large view angle (side view angle) is emitted through the edge portion B of the thinner optical pattern portion 42, so that the outgoing light luminance at the front view angle or the small view angle and the outgoing light luminance at the large view angle can be kept uniform. On the other hand, the light emitted by the light emitting element 21 can be refracted and emitted through the slope 420, so that the divergence angle of the emitted light is reduced, the light can be converged to improve the light emitting rate, and the display brightness of the display panel can be effectively improved. In another aspect, such a slope 420 has a larger solid angle of light source, i.e. it tends to emit more light rays at normal viewing angles, i.e. the light is more concentrated.

It should be noted that, as shown in fig. 1 to 4, the thickness of the edge portion B of the optical pattern portion 42 in the embodiment of the present application is gradually decreased from the middle portion a to the edge portion B, and the formed slope is configured as an arc-shaped slope 420 which is convex outward in a direction away from the middle portion a of the optical pattern portion 42. Without wishing to be bound by theory, the inventors of the present application tried to configure a side surface of the edge portion B of the optical pattern part 42 facing away from the substrate 10 as an arc-shaped slope 420 convex toward the middle portion a close to the optical pattern part 42, as shown in fig. 7. As shown in fig. 8, which shows a simulation effect diagram of two different curved slopes 420 of fig. 1-4 and 7, a wavy line C represents an optical gain curve of a display panel provided with the curved slope 420 shown in fig. 1-4, and a wavy line D represents an optical gain curve of a display panel provided with the curved slope 420 shown in fig. 7. Wherein, the abscissa is the longitudinal coordinate of the arc-shaped slope 420 in the coordinate system, and the ordinate is the optical gain of the display panel. As shown in fig. 8, the peak value of the optical gain corresponding to the arc-shaped slope surface 420 in the embodiment of the present application reaches more than 20%, which is 15% larger than the peak value of the optical gain corresponding to the arc-shaped slope surface 420 shown in fig. 7, and the reason for this is analyzed, that is, the solid angle of the light source of the arc-shaped slope surface 420 in the embodiment of the present application is larger, so that more outgoing light rays tend to reach the positive viewing angle.

It should be noted that the light intensity of the display panel in the state without the arc-shaped slope 420 is β, and the light intensity in the state with the arc-shaped slope 420 is δ, so the light gain here refers to the light intensity of the emergent light of the display panel, and in the state with the arc-shaped slope 420, the gain ratio is (δ - β)/β compared with the gain ratio in the state without the arc-shaped slope 420.

In some embodiments, the range γ of slope angles of the slope 420 satisfies the condition: gamma is more than or equal to 15 degrees and less than or equal to 50 degrees. It should be noted that the slope angle of the slope 420 is an included angle between a plane of the slope 420 or a tangent line of a curved surface of the slope 420 and a plane of the optical pattern portion 42, when the slope angle of the slope 420 is set to be 15 degrees to 50 degrees, preferably 45 degrees, and light emitted by the light emitting element 21 is refracted by the edge portion B of the optical pattern portion 42, the refracted light tends to be a front-view light more, so that a better light condensing effect can be achieved, thereby better improving front-view brightness of the display panel, and reducing power consumption of the display panel.

In other exemplary embodiments, as shown in fig. 5 to 6, the side of the optical patterning member 42 facing away from the substrate 10 is configured as an outwardly convex arc surface, i.e. the thickness of the central portion a of the optical patterning member 42 decreases from the central position to the edge position, so that an arc-shaped slope surface extending from the central position to the edge position is formed on the side of the optical patterning member 42 facing away from the substrate 10. Like this, can make emergent light under the large visual angle (side view angle) go out through thinner optical pattern portion 42's marginal part B similarly for light-emitting luminance under the front view angle and light-emitting luminance under the large visual angle can keep unanimous, and can play the effect of assembling to light and improve the light-emitting rate, can effectively improve display panel's display brightness. In the embodiment of the present application, the light emitting element 21 includes at least an organic light emitting material layer. As one embodiment, the organic light emitting material layer may include a low molecular organic material or a high molecular organic material. The light-emitting element 21 may further include a functional film layer such as a hole transport layer, a hole injection layer, an electron transport layer, an electron injection layer, or the like.

In some embodiments, the orthographic projection of the optical pattern portion 42 on the substrate 10 covers the orthographic projection of the light-emitting element 21 correspondingly arranged on the substrate 10. In this way, it is ensured as much as possible that the light emitted from the light emitting element 21 can pass through the optical pattern portion 42 and the second optical function layer 44, thereby improving the convergence of the light. It is to be emphasized that, for example, in the case of a top-emitting OLED display panel, the evaporation material such as organic light-emitting material cannot be patterned by using a conventional etching process due to its poor stability, and instead, an evaporation process with a mask is used. The evaporation process is to place the evaporation material in a vacuum environment, evaporate or sublimate the evaporation material by heating, a mask assembly is arranged between a cavity for evaporating the evaporation material and the display substrate 10 to be evaporated, a mask plate of the mask assembly is provided with mask openings corresponding to areas needing evaporation, and areas needing no evaporation do not have mask openings. The evaporated or sublimated evaporation material is attached to the display substrate 10 to be evaporated through the mask openings, thereby directly forming a patterned film layer. Ideally, the mask opening of the mask assembly corresponds to a position of the pixel opening region for disposing the organic light emitting material, so that the evaporation material can be precisely evaporated at the corresponding position of the display substrate 10. However, the precision of the fine metal mask is in the order of micrometers, the alignment precision with the display substrate 10 is very high, and generally, when the offset between the position of the mask opening and the position of the pixel opening of the fine metal mask exceeds 5 micrometers, color mixing abnormality of the deposited organic light emitting material is likely to occur during display.

In order to ensure the accuracy of the deposition, the area of the pixel opening area is usually larger than the area of the deposited organic light emitting material layer, therefore, in some embodiments, the pixel defining layer 26 defines a plurality of pixel opening areas and a non-opening area surrounding the pixel opening areas, the light emitting elements 21 are disposed in the pixel opening areas, the orthographic projection of the optical pattern portion 42 on the substrate 10 covers the orthographic projection of the corresponding pixel opening area on the substrate 10, and the orthographic projection of the non-opening area on the substrate 10 has an overlap. In this way, it can be further ensured that the light emitted from the light emitting element 21 can sequentially pass through the first optical function layer and the second optical function layer 44, so as to improve the convergence of the light.

It is worth emphasizing that in some related arts, a color-resist layer formed by using a color film layer and a Black Matrix (BM) is used to replace the conventional polarizer. As shown in fig. 9, in the related art, the display panel generally includes a substrate 01, a driving layer group 02 provided on the substrate 01, a display layer group located on a side of the driving layer group 02 away from the substrate 01, the display layer group including a plurality of light emitting elements 03, and a color barrier layer group located on a side of the display layer group away from the substrate 01. The color resist layer set generally includes a plurality of filter color resists 04 and a light blocking color resist layer 05 surrounding at least each filter color resist 04. The light filtering color resistors 04 are arranged in one-to-one correspondence with the light emitting elements 03 to filter light emitted by the light emitting elements 03, so that light of corresponding colors can be transmitted and light of other colors can be prevented from being transmitted, and when ambient light enters the display panel and is reflected by a film layer with a reflection function in the display panel, the light filtering color resistors 04 can filter the reflected light and then emit the filtered light to the light emitting surface of the display panel, so that the influence degree of the reflected ambient light on the display effect is reduced. Therefore, the color resistance layer group can replace a polarizer to realize the function of adjusting display light. In addition, because the conventional polarizer generally comprises a plurality of stacked polarizing layers, protective layers and other film layers, the color resistance layer group is adopted to replace the conventional polarizer, so that the arrangement of the film layers can be effectively reduced, and the light and thin display panel is facilitated. However, the existing display panel adopting the color resistance layer group still has the problem of insufficient front brightness, and if certain brightness is required, the power consumption of the system is increased, and the service life of the product is influenced. In addition, the color blocking layer 05 can prevent color crosstalk generated by the difference of the colors of the two adjacent color blocking light beams with different colors, thereby avoiding affecting display. However, due to the arrangement of the light shielding color resistance layer 05, the light emitted by the light emitting element 03 cannot realize large-angle light emission, which affects the display of the display panel under a large viewing angle, and if the size of the light shielding color resistance layer 05 is reduced and the size of the filter color resistance 04 is increased, although a large-angle light emission can be realized, the ambient light transmitted through the filter color resistance 04 is increased, that is, more ambient light is reflected in the display panel, which affects the display effect.

In some embodiments, as shown in fig. 2 to fig. 6, the display panel further includes a color-resist layer group 50, and the color-resist layer group 50 is located on a side of the display layer group 20 facing away from the substrate 10. The color resistance layer group 50 includes a light shielding color resistance layer 52 and a plurality of light filtering color resistances 54, the light shielding color resistance layer 52 has a plurality of first openings 56 (see fig. 4), the plurality of first openings 56 are disposed in one-to-one correspondence with at least some of the light emitting elements 21, and the plurality of light filtering color resistances 54 are disposed in the plurality of first openings 56. For example, as shown in fig. 2, as an embodiment, the light-shielding color resist layer 52 and the filter color resist 54 are disposed in different layers, the filter color resist 54 is located on the side of the second optical function layer 44 away from the display layer group 20, and the orthographic projection of the filter color resist 54 on the substrate 10 covers the orthographic projection of the corresponding optical pattern portion 42 on the substrate 10, and overlaps with the orthographic projection of the light-shielding color resist layer 52 on the substrate 10. For another example, as shown in fig. 3 to 6, as another embodiment, the light-shielding color resist layer 52 and the filter color resist 54 are provided in the same layer, and the filter color resist 54 is located between the corresponding optical pattern portion 42 and the second optical function layer 44 and is provided in the corresponding first opening 56.

It should be noted that the filtering color resistor 54 is a color resistor allowing light of a specific wavelength range to pass through, and it can also be said that the filtering color resistor 54 can be configured to allow light of a certain color to pass through, so that the sub-pixels can emit light of the corresponding color. In some embodiments, the plurality of filter chromatics 54 can include a first color filter chromatics that can allow light of a first color to pass, a second color filter chromatics that can allow light of a second color to pass, and a third color filter chromatics that can allow light of a third color to pass. The first color, the second color and the third color may be three primary colors, for example, the first color may be red, the second color may be green, and the third color may be blue.

It should be further noted that the light-shielding color-resisting layer 52 is a color-resisting layer capable of shielding light, and the plurality of light-filtering color-resisting layers 54 and the light-shielding color-resisting layer 52 make the color-resisting layer group 50 have a plurality of light-transmitting areas arranged in one-to-one correspondence with the light-emitting elements 21 and light-tight areas arranged between adjacent light-transmitting areas, and the light-tight areas can be used for preventing the colors of the sub-pixels from interfering with each other and preventing color mixing between the sub-pixels, so that the resolution of the display panel can be improved, and the display effect of the display panel can also be improved. In some embodiments, the light-shielding color-resist layer 52 may be a black matrix, and the material of the black matrix may absorb light to shield light. For example, the material of the black matrix may include a resin and a black pigment, the resin may be an acrylic resin, and for example, the material of the black matrix may further include a metal, such as metallic chrome, or the like. In other embodiments, the opaque region, the first color filter color resist, the second color filter color resist, and the third color filter color resist may be stacked, that is, the three color filter color resists 54 are stacked to form the opaque region, so that the opaque region may replace the black matrix, i.e., the black matrix does not need to be manufactured additionally. Therefore, when the display panel is manufactured, the manufacturing process of the black matrix can be omitted, so that the manufacturing process is simplified, and the production cost of the display panel is reduced.

In some embodiments, the filter color-resistor 54 is located between the corresponding optical pattern 42 and the second optical function layer 44, and the refractive index of the first optical function layer is greater than the refractive index of the filter color-resistor 54. It can be understood that when light (oblique light emitted by the light emitting element 21) passes through the optical pattern portion 42 with a higher refractive index and enters the filtering color resistor 54 with a lower refractive index, refraction occurs, so that the oblique light is converted into light which tends to the normal viewing angle, that is, the light is drawn close to the center of the light emitting element 21, thereby achieving the convergence effect of the display light, further improving the brightness of the normal viewing angle, and reducing the power consumption of the display panel to obtain high brightness of the normal viewing angle. Meanwhile, ambient light enters from the surface of the display panel, is refracted for the first time through the second optical functional layer 44, is deflected to reach the filtering color resistor 54 and the optical pattern part 42, is refracted again when passing through the filtering color resistor 54 and the optical pattern part 42, is deflected to reach metal film layers (such as a source electrode layer and a drain electrode layer of a thin film transistor), is reflected by the metal film layers, is absorbed by the light shielding color resistor layer 52 when reaching the position of the light shielding color resistor layer 52, and can be prevented from influencing the chromaticity accuracy during display due to a large amount of reflection of environmental view in the display panel.

It should be emphasized that the light-shielding color resist layer 52 has the function of shielding and absorbing light, and can prevent crosstalk from occurring in light emitted from each light-emitting element 21, which affects the display quality of the display panel. Meanwhile, due to the existence of the light-shielding color-resisting layer 52, the light-emitting rate of each light-emitting element 21 is affected to a certain extent, so that when the light emitted from the light-emitting element 21 reaches the position of the light-shielding color-resisting layer 52, the light is absorbed by the light-shielding color-resisting layer 52, which affects the light-emitting brightness of the display panel, especially the light-emitting brightness under a large viewing angle. In some embodiments, by setting the thickness of the edge portion B of the optical pattern portion to be in a decreasing trend in the direction from the middle portion a to the edge portion B, when the light emitted from the light emitting element 21 reaches the position of the optical pattern portion 42, the optical pattern portion 42 can refract and converge the light emitted from the light emitting element 21, so as to improve the light emitting rate of the light emitting element 21 to some extent, and thus can improve the light emitting brightness at the front viewing angle (viewing angle of 0 or less) of the display panel and improve the visibility at the side viewing angle (greater viewing angle) of the display panel.

In some embodiments, as shown in fig. 3 and 6, the color filter 54 includes a main body portion 542 covering the optical pattern portion 42, and an extension portion 544 located between the main body portion 542 and a sidewall of the first opening 56. Thus, on the one hand, the light convergence can be improved, and on the other hand, the light emitted by the light-emitting element 21 can be ensured to pass through the filtering color resistor 54 to realize the filtering effect.

As an embodiment, the portion of the color filter 54 corresponding to the edge portion B of the optical pattern portion 42 is also formed with a slope, so that more light rays can be emitted at a forward viewing angle.

It is noted that the difference between the refractive index of the first optical functional layer and the refractive index of the filter color-resistor 54 is not desirably too small, otherwise it is difficult to achieve good light concentration. Accordingly, the difference between the refractive index of the first optical function layer and the refractive index of the filtering color resistor 54 should not be too large, and if the difference between the refractive indexes is too large, on one hand, the optical phenomenon of total reflection of the light at the interface where the first optical function layer and the filtering color resistor 54 are in contact is likely to occur, which results in light loss, and on the other hand, the light converging effect of the light after passing through the optical pattern portion 42 and the filtering color resistor 54 is too strong, which tends to cause too large side-view or oblique-view brightness attenuation. Illustratively, the difference between the refractive index of the first optical function layer and the refractive index of the filtering color resistor 54 is greater than 0.1, which can achieve a good light converging effect, and the difference between the refractive index of the first optical function layer and the refractive index of the filtering color resistor 54 is less than 0.8, which can not only avoid the loss of excessive light due to total reflection, but also avoid the excessive attenuation of the side-view or oblique-view brightness. As a preferred embodiment, the difference between the refractive index of the first optical function layer and the refractive index of the filter color filter 54 is greater than or equal to 0.2 and less than or equal to 0.5, for example, the difference between the refractive index of the first optical function layer and the refractive index of the filter color filter 54 is, for example, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5. Like this, can obtain better light convergence effect, reduce the light loss that the total reflection caused, and look sideways at the angle and the luminance decay at squint angle is less, can realize the light-emitting of wide-angle, improves the display effect under the display panel wide-angle.

Illustratively, the refractive index n1 of the color filter resistor 54 may be 1.0 to 2.0, such as 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0. The refractive index n2 of the first optically functional layer may be 1.1 to 2.0, for example, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0. The refractive index n3 of the second optically functional layer 44 may be 1.1 to 1.5, for example, 1.1, 1.2, 1.3, 1.4, 1.5. As a possible embodiment, the refractive index n1 of the color filter resistor 54 is in the range of 1.0. Ltoreq. N1. Ltoreq.1.5, and the refractive index n2 of the first optically functional layer is in the range of 1.3. Ltoreq. N2. Ltoreq.1.8, for example 1.3, 1.4, 1.5, 1.6, 1.7 or 1.8. Therefore, better light convergence effect can be obtained while better light transmittance is ensured.

Illustratively, the maximum thickness of the first optically functional layer is 2-6 microns, the maximum thickness of the second optically functional layer 44 is 1-4 microns, and the maximum thickness of the color filter 54 is 2-8 microns. For example, in the embodiment shown in fig. 1 to 4, the first optical pattern layer includes a plurality of optical pattern portions 42, and the maximum thickness of the first optical film layer refers to the thickness of the middle portion a of the optical pattern portions 42. The thickness of the film at each position of the color filter 54 is the same, and the maximum thickness of the color filter 54 is the thickness of the film at any position. Since the top surface of the second optical film layer 44 is planar, the maximum thickness of the second optical film layer 44 is the distance from the top surface of the second optical film layer 44 to the surface of the encapsulating layer 30 (see fig. 2) or to the surface of the color filter 54 (see fig. 3).

For another example, as shown in the embodiments of fig. 5 and 6, if the first optical pattern layer includes a plurality of optical pattern portions 42, the maximum thickness of the first optical film layer means the thickness of the middle position of the optical pattern portions 42. Since the filter color resists 54 are not film layers of uniform thickness, the maximum thickness of the filter color resists 54, i.e., the maximum distance from the top surface of the encapsulant layer 30.

It can be understood that the refractive index of the first optical function layer, the refractive index of the filtering color resistor 54, and the refractive index of the second optical function layer 44 can be adaptively adjusted according to design requirements, so as to reduce the reflectivity of the display panel to ambient light, improve light convergence, and reduce light attenuation at a large viewing angle.

In some embodiments, each first opening 56 is directly opposite to the corresponding light emitting element 21. The minimum distance between the edge of the orthographic projection of the light emitting element 21 on the substrate 10 and the edge of the orthographic projection of the optical pattern portion 42 on the substrate 10 is a first distance L1, and the minimum distance between the edge of the orthographic projection of the light emitting element 21 on the substrate 10 and the edge of the orthographic projection of the first opening 56 on the substrate 10 is a second distance L2. Wherein the first distance and the second distance satisfy the condition: l1 is less than L2, so that the edge of the optical pattern portion 42 is spaced from the corresponding light-shielding color resist layer 52 by a certain distance, the light-filtering color resist 54 with a lower refractive index can completely cover the optical pattern portion 42, and the gap between the optical pattern portion 42 and the corresponding light-shielding color resist layer 52 is filled, so that the oblique light emitted from the edge of the light-emitting element 21 can sequentially pass through the optical pattern portion 42 and the light-filtering color resist 54, and the convergence of the light is improved.

Illustratively, the color filter resistors 54 are disposed in the corresponding first openings 56, and the first distance ranges from: l1 is more than or equal to 1 micron and less than or equal to 5 microns; the range of the second distance is: l2 is more than or equal to 5 microns and less than or equal to 9 microns.

In some embodiments, the orthographic projection of the light-shielding color-resistance layer 52 on the substrate 10 may overlap with at least a portion (e.g., a portion; e.g., all) of the orthographic projection of the pixel driving circuit on the substrate 10, so that the light reflection caused by the external light irradiating on the pixel driving circuit can be reduced, and the display effect of the display panel can be improved. In addition, the orthographic projection of the light shading color resistance layer 52 on the substrate 10 can be overlapped with the orthographic projection of the transistor (e.g., thin film transistor) in the pixel driving circuit on the substrate 10, so that the problem of leakage current in the transistor caused by the irradiation of the semiconductor layer (the material of the semiconductor layer includes silicon, for example) of the thin film transistor by external light can be improved.

In some embodiments, the display panel further includes an encapsulation layer 30 positioned between the display layer set 20 and the color barrier layer set 50, and the first optical function layer has a refractive index less than a refractive index of the encapsulation layer 30. It should be understood that the refractive index of the first optical function layer is smaller than the refractive index of the encapsulation layer 30, on one hand, light passing through the encapsulation layer 30 can be focused when passing through the optical pattern portion 42, and on the other hand, when the ambient light enters the display panel, the ambient light can reach the film layer with a reflection function (for example, a metal film layer in the display panel) for reflection after being refracted by the optical pattern portion 42 with a smaller refractive index and the encapsulation layer 30, so that most of the ambient light can be reflected to the light-shielding color-resistance layer 52.

Certainly, in another embodiment, the refractive index of the first optical function layer may also be equal to the refractive index of the encapsulation layer 30, so that the light can be transmitted linearly from the encapsulation layer 30 and the first optical function layer without refraction, which is not limited herein.

Illustratively, the encapsulation layer 30 may be a single inorganic layer or a stacked film of an inorganic layer and an organic layer, with the inorganic layer preferably being Al ₂ O ₃ 、TiO ₂ 、SiN _x 、SiCN _x 、SiO _x The organic layer can be prepared by adopting an ink-jet printing technology, and the material of the organic layer is preferably one or more of acrylic, hexamethyldisiloxane, polyacrylates, polycarbonate and polystyrene.

In order to better understand the beneficial effects of the present application, the following will describe the manufacturing method of the flexible display panel in some embodiments in detail:

as shown in fig. 10, a method for manufacturing a flexible display panel in an embodiment of the present application includes the steps of:

step S110: providing a substrate 10;

in some embodiments, as shown in fig. 2-5, the base plate 10 may include a substrate 12 and a driving layer group formed on the substrate 12, and the substrate 12 may include an organic material having elasticity and ductility, such as Polyimide (PI), although the substrate 12 is not limited to polyimide and may also include various other organic materials having elasticity and ductility.

The driving layer group may include a buffer layer 14 and a thin film transistor 11 formed on a substrate 12, and the buffer layer 14 may include at least one of organic materials such as Polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyacrylate, polyimide, and the like, forming a layered structure in a single layer or a multi-layer stack. A single or multi-layered stacked layered structure may also be formed of at least one of silicon oxide, silicon nitride, aluminum oxide, aluminum nitride, titanium oxide, or titanium nitride, or may include an organic material layer or an inorganic material layer or a composite layer of an organic material layer and an inorganic material layer.

The thin film transistor 11 is disposed above the buffer layer 14, and can control each sub-pixel to emit light. As one embodiment, as shown in fig. 10, the thin film transistor 11 may include a semiconductor layer 112, a gate electrode 114, a source electrode 116, and a drain electrode 118. The semiconductor layer 112 may be formed of an amorphous silicon layer, a metal oxide, or a polysilicon layer, or may be formed of an organic semiconductor material. The semiconductor layer 112 may be covered with a gate insulating layer 16, and a gate electrode 114 may be disposed on the gate insulating layer 16. The gate insulating layer 16 may be formed of silicon oxide, silicon nitride, or other insulating organic or inorganic materials in consideration of adhesion to adjacent layers, formability of a stack target layer, and surface flatness. The gate electrode 114 may be covered by an interlayer insulating layer 18 formed of silicon oxide, silicon nitride, and/or other suitable insulating organic or inorganic materials. A portion of the gate insulating layer 16 and the interlayer insulating layer 18 may be removed, and a contact hole may be formed to expose a predetermined region of the semiconductor layer 112 after the removal. The source electrode 116 and the drain electrode 118 may contact the semiconductor layer 112 via the contact holes.

Step S120: forming a display layer group 20 and an optical function layer group on the substrate 10;

wherein, the display layer group 20 comprises a plurality of light-emitting elements 21, the optical function layer group is positioned at one side of the display layer group 20, which is far away from the substrate 10, and the optical function layer group comprises a first optical function layer and a second optical function layer 44 which is arranged at one side of the first optical function layer, which is far away from the display layer group 20 in a laminated manner; the first optical function layer comprises a plurality of optical pattern parts 42, and the plurality of optical pattern parts 42 are arranged corresponding to at least part of the light-emitting elements 21 one by one; the orthographic projection of the second optical function layer 44 on the substrate 10, and the orthographic projection of the first optical function layer on the substrate 10 is covered; the refractive index of the first optically functional layer is greater than the refractive index of the second optically functional layer 44.

In some embodiments, since the driving layer group has a complex layer structure, and thus, the top surface thereof may not be flat, the display layer group 20 further includes the planarization layer 22 to form a sufficiently flat top surface. After the planarization layer 22 is formed, a via hole may be formed in the planarization layer 22 to expose the source electrode 116 or the drain electrode 118 of the driving layer group, and a pixel electrode is formed on the planarization layer 22, and the pixel electrode is in contact connection with the source electrode 116 or the drain electrode 118 of the driving layer group through the aforementioned via hole.

In some embodiments, the pixel defining layer 26 is formed on the planarization layer 22 and exposes at least a portion of each pixel electrode. For example, the pixel defining layer 26 may cover at least a portion of an edge of each pixel electrode, thereby exposing at least a portion of each pixel electrode. Thus, the pixel defining layer 26 defines a plurality of pixel defining openings and a non-opening area located between the pixel defining openings, a middle portion or a whole portion of the pixel electrode is exposed through the pixel defining openings, and the light emitting element 21 is disposed in the pixel defining openings.

The common electrode 28 opposite to the pixel electrode can cover the whole surface of the pixel defining layer 26, and can be made of metal with lower power function, such as silver, lithium, magnesium, calcium, strontium, aluminum, indium, or metal compound or alloy material. In some embodiments, the common electrode 28 may cover the light emitting elements 21 in the pixel defining openings and the spacing regions between the pixel defining openings by evaporation.

In some embodiments, before forming the color-resist layer group 50, the method further includes the steps of:

forming an encapsulation layer 30 on the display layer group 20;

in one embodiment, the encapsulation layer 30 includes a plurality of inorganic encapsulation layers and at least one organic encapsulation layer disposed between the plurality of inorganic encapsulation layers, and the plurality of inorganic encapsulation layers form an enclosed space for sealing the organic encapsulation layer. It is to be understood that the inorganic encapsulation film layers may tend to minimize or completely prevent the penetration of moisture, oxygen and/or hydrogen into the driving layer and the light emitting element 2121, and thus, as an embodiment, the inorganic encapsulation film layers and the organic encapsulation film layers may be alternately stacked to be formed, the inorganic encapsulation film layers may be disposed as the uppermost and lowermost layers of the encapsulation unit, and the inorganic encapsulation film layers of the outermost layer may completely cover the organic encapsulation film layers, thereby forming a blocking space that may block the entrance of water and oxygen.

Fig. 12 is a schematic structural diagram of a display device in an embodiment of the present application.

Based on the flexible display panel, an embodiment of the present application further provides a display device, which includes the display panel according to any of the embodiments.

As shown in fig. 12, the display device may be a display terminal, such as a tablet computer, and in other embodiments, the display device may also be a mobile communication terminal, such as a mobile phone terminal. In still other embodiments, the display device may also be a wearable device, a VR device, an in-vehicle device, or the like.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A display panel, comprising:

a substrate;

the second optical function layer is arranged on one side, far away from the display layer group, of the first optical function layer in a laminated mode, and orthographic projection of the second optical function layer on the substrate covers orthographic projection of the first optical function layer on the substrate;

2. The display panel according to claim 1, wherein the optical pattern portion includes a middle portion and an edge portion surrounding the middle portion, the edge portion having a thickness that decreases in a direction from the middle portion toward the edge portion;

preferably, an orthographic projection of the edge portion on the substrate is arranged to be offset from the light emitting element.

3. The display panel according to claim 2, wherein the thickness of the edge portion becomes continuously smaller in a direction from the middle portion toward the edge portion to form a slope on a side of the edge portion facing away from the substrate;

preferably, the thickness of the middle part is uniformly set, and the surface of one side of the edge part, which is far away from the substrate, is configured into an outward convex arc-shaped slope;

preferably, the range γ of the slope angle of the slope surface satisfies the condition: gamma is more than or equal to 15 degrees and less than or equal to 50 degrees.

4. The display panel according to claim 2, wherein a surface of the optical pattern portion facing away from the substrate is configured as an arc-shaped face convex outward.

5. The display panel according to claim 1, wherein an orthogonal projection of the optical pattern portion on the substrate covers an orthogonal projection of the light-emitting element provided corresponding thereto on the substrate;

preferably, the display layer group includes a pixel defining layer defining a plurality of pixel opening areas, on which the light emitting elements are disposed, and a non-opening area surrounding the pixel opening areas;

the optical pattern part is in orthographic projection on the substrate, covers the orthographic projection of the corresponding pixel opening area on the substrate, and has overlap with the orthographic projection of the non-opening area on the substrate.

6. The display panel according to any one of claims 1 to 5, wherein the second optically functional layer is directly applied to a surface of the first optically functional layer facing away from the display layer group.

7. The display panel according to any one of claims 1 to 5, wherein the display panel further comprises a color barrier layer group, the color barrier layer group being located on a side of the display layer group facing away from the substrate, the color barrier layer group comprising:

a plurality of color filters arranged in the first openings;

wherein the color filter is located on a side of the second optical function layer facing away from the display layer group; or

8. The display panel according to claim 7, wherein each of the first openings is directly opposite to the corresponding light emitting element, and an edge of an orthogonal projection of the light emitting element on the substrate is a first distance L1 from an edge of an orthogonal projection of the corresponding optical pattern portion on the substrate;

the minimum distance from the edge of the orthographic projection of the light-emitting element on the substrate to the edge of the orthographic projection of the first opening on the substrate is a second distance L2;

wherein the first distance and the second distance satisfy a condition: l1 is less than L2;

preferably, the range of the first distance is: l1 is more than or equal to 1 micron and less than or equal to 5 microns; the range of the second distance is: l2 is more than or equal to 5 microns and less than or equal to 9 microns.

9. The display panel of any one of claims 1-5, further comprising an encapsulation layer between the set of display layers and the set of optically functional layers;

10. A manufacturing method of a display panel is characterized by comprising the following steps of;

providing a substrate;

11. A display device characterized by comprising the display panel according to any one of claims 1 to 9.