Display panel, method for manufacturing display panel, and display device

Abstract

The present application discloses a display panel, a method for preparing a display panel, and a display device, comprising a substrate, an active switch layer, a pixel definition layer, and a light-emitting unit, wherein the pixel definition layer is arranged on the active switch layer, corresponding to the non-opening area of ​​the display panel; the light-emitting unit is arranged on the active switch layer, corresponding to the opening area of ​​the display panel; the display panel also comprises a filter layer, which is arranged on the side of the pixel definition layer and the light-emitting unit away from the substrate, and comprises a black matrix unit and a filter unit, wherein the black matrix unit corresponds to the pixel definition layer one by one, and the filter unit corresponds to the light-emitting unit one by one, and the filter unit comprises a filter part and a spacer part arranged in a stacked manner, wherein the spacer part is located on the side of the filter part facing the substrate, and the material of the filter part comprises a color blocking material, and the refractive index of the filter part is less than the refractive index of the spacer part. Through the above design, the reflection of the display panel to external light is reduced, and the contrast of the display panel is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel, a method for preparing a display panel, and a display device. Background Art

[0002] With the rapid development of display technology, in OLED display panels, polarizers can effectively reduce the reflectivity of display panels under strong light, but the use of polarizers will lose nearly 58% of the light output. In addition, polarizers are thick and brittle, which is not conducive to the development of dynamic bending products. The usual practice is to use a filter layer to replace the polarizer, which is classified as POL-less (de-polarizer) technology.

[0003] However, due to the properties of the OLED display panel itself and the poor light-blocking effect of the filter layer, the OLED display panel has a high reflective effect on ambient light. Therefore, how to prevent external natural light from entering the display panel and irradiating the anode of the light-emitting unit to cause light reflection has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present application is to provide a display panel, a method for manufacturing a display panel and a display device, so as to reduce the reflection of external light by the display panel and improve the contrast of the display panel.

[0005] The present application discloses a display panel, comprising a substrate, an active switching layer, a pixel definition layer and a light-emitting unit, wherein the active switching layer is arranged on the substrate, the pixel definition layer is arranged on the active switching layer, and is arranged corresponding to the non-opening area of ​​the display panel; the light-emitting unit is arranged on the active switching layer, and is arranged corresponding to the opening area of ​​the display panel; the display panel also comprises a filter layer, wherein the filter layer is arranged on a side of the pixel definition layer and the light-emitting unit away from the substrate, the filter layer comprises a black matrix unit and a filter unit, the black matrix unit corresponds to the pixel definition layer one-to-one, the filter unit corresponds to the light-emitting unit one-to-one, the filter unit comprises a filter part and a spacer part arranged in a stacked manner, the spacer part is located on the side of the filter part facing the substrate, the material of the filter part comprises a color resist material, and the refractive index of the filter part is less than the refractive index of the spacer part.

[0006] Optionally, the material of the spacer portion includes a color resist material, and the color resist material includes color resists of red, green, blue and other colors.

[0007] Optionally, the material of the spacer part includes a transparent anti-reflection material, and the transparent anti-reflection material includes one or more combinations of transparent polyimide organic material, silicon monoxide, silicon nitride, magnesium fluoride, titanium dioxide, and aluminum oxide.

[0008] Optionally, a side of the spacer portion close to the filter portion is concave inwardly toward the substrate to form a spacer groove, and a side of the filter portion close to the spacer portion is convex inwardly toward the substrate to form a filter protrusion, and the shape of the filter protrusion matches the shape of the spacer groove;

[0009] Taking the direction from the substrate toward the light-emitting unit as the first direction, the minimum thickness of the spacer portion along the first direction is H1, the maximum thickness of the spacer portion along the first direction is H2, and the thickness of the black matrix unit along the first direction is H3, wherein H1 is greater than 1 / 4 of H3 and less than 1 / 2 of H3; H2 is less than 3 / 4 of H3 and greater than 1 / 2 of H3.

[0010] Optionally, a side of the filter portion facing away from the spacer portion is concave inwardly toward the substrate to form a filter groove.

[0011] Optionally, the display panel further includes a light absorbing unit, the light absorbing unit corresponds to the black matrix unit one by one, and the black matrix unit is stacked on a side of the light absorbing unit away from the substrate;

[0012] The orthographic projection of the light absorbing unit on the substrate covers the orthographic projection of the black matrix unit on the substrate, and the orthographic projection area of ​​the light absorbing unit on the substrate is larger than the orthographic projection area of ​​the black matrix unit on the substrate;

[0013] Wherein, the light absorbing unit can be used to absorb light.

[0014] Optionally, the light absorbing unit includes a stacked transparent electrode and an electrochromic layer, the transparent electrode is located between the electrochromic layer and the black matrix unit, the material of the electrochromic layer includes an electrochromic material, and the transparent electrode drives the transmittance of the electrochromic layer to change.

[0015] Optionally, the shape of the spacer groove is an inverted trapezoid, the spacer groove includes a spacer bottom surface and a spacer side surface, the spacer side surface is connected to the edge of the spacer bottom surface, and the angle between the spacer side surface and the spacer bottom surface is an obtuse angle; the shape of the filter protrusion is an inverted trapezoid, the filter protrusion includes a filter top surface and a filter side surface, the filter side surface is connected to the edge of the filter top surface, and the angle between the filter side surface and the filter top surface is an obtuse angle;

[0016] The filter top surface is in contact with the spacer bottom surface, and the filter side surface is in contact with the spacer side surface.

[0017] The present application also discloses a method for preparing a display panel, which is used to prepare the display panel described above, comprising the steps of:

[0018] preparing the active switching layer on the substrate;

[0019] Preparing the pixel definition layer and the light-emitting unit on the active switch layer;

[0020] Preparing the black matrix unit on the pixel definition layer;

[0021] preparing the spacer portion on the light-emitting unit;

[0022] preparing the filter portion on the spacer portion to form the filter layer;

[0023] The pixel definition layer corresponds to the non-opening area; and the light-emitting unit corresponds to the opening area.

[0024] The present application also discloses a display device, including a driving circuit and a display panel, wherein the driving circuit is connected to the display panel.

[0025] Compared with the existing solution that the filter layer only has a single-layer filter unit and a black matrix unit, the present application provides a spacer part under the filter part, and makes the refractive index of the filter part smaller than the refractive index of the spacer part. On the one hand, the height of the filter part is raised, so that after the external light passes through the filter part, the refracted light is easily absorbed by the adjacent black matrix unit; on the other hand, because the refractive index of the filter part is smaller than the refractive index of the spacer part, the light can be refracted twice when passing through the junction between the filter part and the spacer part, so that the refracted light is refracted toward the black matrix unit again, thereby further increasing the amount of light refracted onto the black matrix unit when the external light passes through the filter unit, reducing the possibility of reflection when the external light passes through the filter layer and irradiates the metal layer on the light-emitting unit, reducing the reflection of natural light, and improving the contrast of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0027] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application;

[0028] Figure 2is a schematic diagram of a display panel according to the first embodiment of the present application;

[0029] Figure 3 is a partially enlarged schematic diagram of a display panel of the first embodiment of the present application;

[0030] Figure 4 It is a schematic diagram of an inverted trapezoidal spacer groove of the first embodiment of the present application;

[0031] Figure 5 is a schematic diagram of a filter portion of the first embodiment of the present application;

[0032] Figure 6 is a schematic diagram of a light absorbing unit according to the first embodiment of the present application;

[0033] Figure 7 It is a schematic diagram of a light absorbing unit with controllable light transmittance in the first embodiment of the present application;

[0034] Figure 8 is a schematic diagram of a display panel according to a second embodiment of the present application;

[0035] Fig. 9 is a schematic diagram of a method for preparing a display panel according to an embodiment of the present application;

[0036] Fig.10 The figure is a schematic diagram of a display panel preparation process according to an embodiment of the present application.

[0037] Among them, 10, display device; 20, driving circuit; 30, display panel; 100, substrate; 110, active switch layer; 120, pixel definition layer; 130, light-emitting unit; 140, thin-film encapsulation layer; 150, buffer layer; 200, filter layer; 300, black matrix unit; 400, filter unit; 500, filter part; 510, filter groove; 520, filter protrusion; 521, filter top surface; 522, filter side surface; 600, spacer part; 610, spacer groove; 611, spacer bottom surface; 612, spacer side surface; 700, light absorption unit; 710, transparent electrode; 720, electrochromic layer. DETAILED DESCRIPTION

[0038] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0039] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, features defined as "first" and "second" may explicitly or implicitly include one or more of the features; "plurality" means two or more. The term "including" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may exist or be added.

[0040] In addition, terms indicating orientation or positional relationships, such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside,” are described based on the orientation or relative positional relationships shown in the accompanying drawings and are merely simplified descriptions for the convenience of describing the present application. They do not indicate that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limitations on the present application.

[0041] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0043] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application. Figure 1 As shown, the present application discloses a display device 10, including a driving circuit 20 and a display panel 30, wherein the driving circuit 20 is connected to the display panel 30 to drive the display panel 30 to display an image.

[0044] The display panel 30 is an OLED (Organic Light-Emitting Diode) display panel 30 .

[0045] The present application also discloses a display panel 30, which can be used in the display device 10 described above. For the display panel 30, the present application provides the following design, which is specifically introduced through the following embodiments:

[0046] Embodiment 1:

[0047] Figure 2is a schematic diagram of a display panel according to the first embodiment of the present application. Figure 2 As shown, the direction indicated by the arrow in the figure is the transmission direction of part of the external natural light. The present application discloses a display panel 30, which includes a substrate 100, an active switching layer 110, a pixel definition layer 120 and a light-emitting unit 130. The active switching layer 110 is arranged on the substrate 100, and the pixel definition layer 120 is arranged on the active switching layer 110, corresponding to the non-opening area of ​​the display panel 30; the light-emitting unit 130 is arranged on the active switching layer 110, corresponding to the opening area of ​​the display panel 30.

[0048] The display panel 30 also includes a filter layer 200, which is arranged on a side of the pixel definition layer 120 and the light-emitting unit 130 away from the substrate 100. The filter layer 200 includes a black matrix unit 300 and a filter unit 400. The black matrix unit 300 corresponds one-to-one to the pixel definition layer 120, and the filter unit 400 corresponds one-to-one to the light-emitting unit 130, that is, the black matrix unit 300 is located in the vertical direction of the pixel definition layer 120, corresponding to the non-opening area of ​​the display panel 30, and the filter unit 400 is located in the vertical direction of the light-emitting unit 130, corresponding to the opening area of ​​the display panel 30.

[0049] The filter unit 400 includes a filter portion 500 and a spacer portion 600 that are stacked, the spacer portion 600 is located on the side of the filter portion 500 facing the substrate 100, the material of the filter portion 500 includes a color resist material, the color resist material includes red, green and blue color resists, and the color of the filter portion 500 corresponds to the corresponding light-emitting unit 130.

[0050] The refractive index of the filter portion 500 is smaller than the refractive index of the spacer portion 600 , and the filter unit 400 is used to refract external light toward the adjacent black matrix unit 300 .

[0051] Compared with the existing solution in which the filter layer 200 has only a single-layer filter unit 400 and a black matrix unit 300, the present application sets a spacer portion 600 under the filter portion 500, and makes the refractive index of the filter portion 500 smaller than the refractive index of the spacer portion 600. On the one hand, the height of the filter portion 500 is raised, so that after the external light passes through the filter portion 500, the refracted light is easily absorbed by the adjacent black matrix unit 300.

[0052] Secondly, since the refractive index of the filter portion 500 is smaller than that of the spacer portion 600, the light can be refracted twice when passing through the boundary between the filter portion 500 and the spacer portion 600, so that the refracted light is refracted again toward the black matrix unit 300, thereby further increasing the amount of light refracted onto the black matrix unit 300 when the external light passes through the filter unit 400, and reducing the possibility of reflection when the external light passes through the filter layer 200 and illuminates the metal layer on the light-emitting unit 130, thereby reducing the reflection of natural light by the display panel 30 and improving the contrast of the display panel 30.

[0053] The thickness of the spacer portion 600 may be about to The display panel 30 further includes a thin film encapsulation layer 140 and a buffer layer 150. The thin film encapsulation layer 140 is disposed on the pixel definition layer 120 and the light emitting unit 130 to perform an encapsulation function. The buffer layer 150 is disposed on the side of the thin film encapsulation layer 140 away from the substrate 100. The buffer layer 150 is used to prevent water vapor from entering the light emitting unit 130 in the display panel 30. The buffer layer 150 includes an inorganic film of silicon nitride (SiNx), and the buffer layer 150 can be a single-layer film or a multi-layer film. The thickness of the buffer layer 150 can be about 10 ... to about

[0054] Furthermore, the spacer portion 600 may also be made of a color resist material, so this embodiment is equivalent to the filter unit 400 being composed of two layers of color resist materials with different refractive indices. Specifically, the material of the spacer portion 600 includes a color resist material, and the color resist material includes color resists of red, green, and blue colors. The color resist material includes resin, photoinitiator, pigment, pigment dispersant, solvent, and additives, etc. The refractive index can be increased by increasing the ratio of resin and pigment, so that the refractive index of the spacer portion 600 and the filter portion 500 are different. Since this embodiment is equivalent to a filter unit 400 having two layers of color resist of the same color, the color display effect of the display panel 30 can be improved compared to a filter unit 400 having only one layer of color resist material.

[0055] Figure 3 is a partially enlarged schematic diagram of a display panel of the first embodiment of the present application, such as Figure 3As shown, the direction indicated by the arrow in the figure is a first direction. In order to further improve the refraction effect of the filter unit 400 on the outside world, the present application concavely forms a spacer groove 610 on the side of the filter part 600 close to the filter part 500 toward the substrate 100, and convexly forms a filter protrusion 520 on the side of the filter part 500 close to the spacer part 600 toward the substrate 100. The shape of the filter protrusion 520 matches the shape of the spacer groove 610.

[0056] Furthermore, taking the direction from the substrate 100 toward the light-emitting unit 130 as the first direction, the bottom surface of the spacer portion 600 and the bottom surface of the black matrix unit 300 are on the same horizontal plane, the bottom surface of the filter portion 500 is higher than the bottom surface of the black matrix unit 300, the top surface of the filter portion 500 is higher than the top surface of the black matrix unit 300, the minimum thickness of the spacer portion 600 along the first direction is H1, the maximum thickness of the spacer portion 600 along the first direction is H2, and the thickness of the black matrix unit 300 along the first direction is H3. Among them, H1 is greater than 1 / 4 of H3, and H1 is less than 1 / 2 of H3; H2 is less than 3 / 4 of H3, and H2 is greater than 1 / 2 of H3.

[0057] Thereby, enough external light can be refracted onto the black matrix unit 300 when passing through the filter portion 500. Even if some light passes through the filter portion 500, some light will be refracted to the lower half of the black matrix unit 300 when passing through the spacer portion 600, thereby reducing the amount of external light that enters the display panel 30 and reaches the light-emitting unit 130, thereby better preventing the display panel 30 from reflecting external light.

[0058] Among them, the shape of the spacer groove 610 and the shape of the filter protrusion 520 can be arc-shaped or inverted trapezoidal. Specifically, the present application takes the shape of the spacer groove 610 and the shape of the filter protrusion 520 as an example where both are inverted trapezoidal, as follows.

[0059] Figure 4 Schematic diagram of an inverted trapezoidal spacer groove of the first embodiment of the present application, such as Figure 4As shown, in order to make the light from the outside entering the display panel 30 be absorbed by the black matrix unit 300 as much as possible, the spacer groove 610 of the present application is in the shape of an inverted trapezoid, and the spacer groove 610 includes a spacer bottom surface 611 and a spacer side surface 612, the spacer side surface 612 is connected to the edge of the spacer bottom surface 611, and the angle between the spacer side surface 612 and the spacer bottom surface 611 is an obtuse angle; the shape of the filter protrusion 520 is in the shape of an inverted trapezoid, the filter protrusion 520 includes a filter top surface 521 and a filter side surface 522, the filter side surface 522 is connected to the edge of the filter top surface 521, and the angle between the filter side surface 522 and the filter top surface 521 is an obtuse angle; and the filter top surface 521 is in contact with the spacer bottom surface 611, and the filter side surface 522 is in contact with the spacer side surface 612.

[0060] Since the angle between the filter side surface 522 and the filter top surface 521 and the angle between the spacer side surface 612 and the spacer bottom surface 611 are both obtuse angles, the refraction angle of external light when irradiating the filter side surface 522 and the spacer side surface 612 is larger, and the filter unit 400 has a better refraction effect on light.

[0061] Furthermore, grooves may be provided on the upper surface of the filter portion 500, such as Figure 5 As shown, the side of the filter portion 500 away from the spacer portion 600 is concave toward the substrate 100 to form a filter groove 510 .

[0062] The filter protrusion 520 and the spacer groove 610 are combined to achieve a double refraction effect, that is, the light is refracted for the first time by the filter groove 510 when entering the filter portion 500, and then refracted for the second time when passing between the filter protrusion 520 and the spacer groove 610.

[0063] Furthermore, the curvature of the filter groove 510 is smaller than that of the spacer groove, and the external light has been refracted at a large angle when passing through the filter groove 510, and the external light can be refracted to the black matrix units 300 on both sides as much as possible, further improving the refraction effect of the filter unit 400 on light.

[0064] The shape of the filter groove 510 is the same as that of the spacer groove 610 , and may also be an arc or an inverted trapezoid.

[0065] Figure 6 is a schematic diagram of a light absorbing unit of the first embodiment of the present application, such as Figure 6As shown, in this embodiment, a light absorbing unit 700 is further arranged under the black matrix unit 300. Specifically, the display panel 30 also includes a light absorbing unit 700, and the light absorbing unit 700 corresponds to the black matrix unit 300 one by one, and the black matrix unit 300 is stacked on the side of the light absorbing unit 700 away from the substrate 100, that is, a light absorbing unit 700 is arranged under each black matrix unit 300.

[0066] The orthographic projection of the light absorbing unit 700 on the substrate 100 covers the orthographic projection of the black matrix unit 300 on the substrate 100, and the orthographic projection area of ​​the light absorbing unit 700 on the substrate 100 is larger than the orthographic projection area of ​​the black matrix unit 300 on the substrate 100; wherein the light absorbing unit 700 can be used to absorb light.

[0067] The material of the black matrix unit 300 is composed of black color resist, and the material of the light absorbing unit 700 is also composed of black color resist, which is equivalent to setting up two layers of black color resist. Since the area of ​​the light absorbing unit 700 below is larger than the area of ​​the black matrix unit 300, the refracted light will be absorbed at the step surface formed between the light absorbing unit 700 and the black matrix unit 300, thereby greatly improving the effect of the display panel 30 in preventing reflection of external light.

[0068] Of course, since the light absorbing unit 700 will also cause the aperture ratio of the display panel 30 to decrease, the present application further improves the light absorbing unit 700 and configures the light absorbing unit 700 to be a structure with controllable light transmittance, as follows.

[0069] Figure 7 is a schematic diagram of a light absorbing unit with controllable light transmittance in the first embodiment of the present application, such as Figure 7 As shown, the light absorption unit 700 includes a stacked transparent electrode 710 and an electrochromic layer 720, the transparent electrode 710 is located between the electrochromic layer 720 and the black matrix unit 300, the material of the electrochromic layer 720 includes an electrochromic material, and the transparent electrode 710 drives the light transmittance of the electrochromic layer 720 to change.

[0070] Of course, in the first direction, the transparent electrode 710 is below and the electrochromic layer 720 is above. The present application preferably adopts that the transparent electrode 710 is located between the electrochromic layer 720 and the black matrix unit 300, that is, the transparent electrode 710 is above and the electrochromic layer 720 is below, so that when the light absorbing unit 700 is in the light absorbing state, the light transmittance of the electrochromic layer 720 is low, and because the electrochromic layer 720 is below, light will not pass through the transparent electrode 710 and enter the interior of the display panel 30.

[0071] Moreover, compared with the solution in which the light absorbing unit 700 is directly composed of black color resist material, the present solution realizes controllable light transmittance of the light absorbing unit 700 by combining the transparent electrode 710 and the electrochromic layer 720. When the display panel 30 displays an image, or when a bright area is displayed in the image, the light transmittance of the corresponding light absorbing unit 700 can be controlled to increase, thereby not affecting the aperture ratio of the display panel 30; when the display panel 30 does not display an image, or when a dark area is displayed in the image, the light transmittance of the corresponding light absorbing unit 700 can be controlled to decrease, thereby not affecting the anti-light reflection effect of the display panel 30.

[0072] Embodiment 2:

[0073] Figure 8 is a schematic diagram of a display panel 30 according to a second embodiment of the present application. Figure 8 As shown, different from the first embodiment, the material of the spacer part 600 includes a transparent anti-reflection material, and the transparent anti-reflection material includes one or more combinations of transparent polyimide organic material, silicon monoxide, silicon nitride, magnesium fluoride, titanium dioxide, and aluminum oxide.

[0074] Compared with the first embodiment, the spacer portion 600 of this embodiment is made of a transparent anti-reflection material, which has a lower production cost and does not require modulation of two color-resisting materials of the same color with different refractive indices.

[0075] The present application also discloses a method for preparing a display panel 30 , which is used to prepare the display panel 30 described in the above embodiment, and is specifically as follows.

[0076] Fig. 9 is a schematic diagram of a method for preparing a display panel according to an embodiment of the present application, Fig.10 is a schematic diagram of a display panel preparation process according to an embodiment of the present application. Figure 9-10 As shown, the present application discloses a method for preparing a display panel 30, comprising the steps of:

[0077] S1: preparing the active switching layer on the substrate;

[0078] S2: preparing the pixel definition layer and the light-emitting unit on the active switching layer;

[0079] S3: preparing the black matrix unit on the pixel definition layer;

[0080] S4: preparing the spacer portion on the light-emitting unit;

[0081] S5: preparing the filter portion on the spacer portion to form the filter layer;

[0082] The pixel definition layer 120 corresponds to the non-opening area; and the light emitting unit 130 corresponds to the opening area.

[0083] By arranging the spacer portion 600 under the filter portion 500 and making the refractive index of the filter portion 500 smaller than that of the spacer portion 600, on the one hand, the height of the filter portion 500 is raised, so that after the external light passes through the filter portion 500, the refracted light is easily absorbed by the adjacent black matrix unit 300; on the other hand, because the refractive index of the filter portion 500 is smaller than the refractive index of the spacer portion 600, the light can be refracted twice when passing through the junction between the filter portion 500 and the spacer portion 600, so that the refracted light that has been emitted is refracted toward the black matrix unit 300 again, thereby further increasing the amount of light refracted onto the black matrix unit 300 when the external light passes through the filter unit 400, and reducing the possibility of reflection when the external light passes through the filter layer 200 and irradiates the metal layer on the light-emitting unit 130, thereby reducing the reflection of natural light by the display panel 30 and improving the contrast of the display panel 30.

[0084] The step S2: preparing the pixel definition layer and the light-emitting unit on the active switch layer; further comprising the steps of:

[0085] S21: preparing the thin film encapsulation layer on the pixel definition layer and the light-emitting unit;

[0086] S22: preparing a buffer layer on the thin film encapsulation layer.

[0087] The thin film encapsulation layer 140 plays a role of encapsulation, and the buffer layer 150 is used to prevent water vapor from entering the light-emitting unit 130 in the display panel 30 .

[0088] Taking the material of the spacer part 600 as a color resist material such as red, green and blue as an example, when preparing the spacer part 600, the material of the spacer part 600 can be coated or deposited on the surface of the buffer layer 150 and the black matrix unit 300; then, a photoresist layer is formed on the spacer part 600; the photoresist layer may include a fluorinated acrylic monomer, a fluorinated alkyl monomer material or a hydrophobic fluorinated silane promoter. The photoresist layer may be a negative photoresist layer or a positive photoresist; then, a mask is set on the photoresist layer, and the photoresist layer is irradiated with light passing through the mask, and the mask may be, for example, a halftone mask, and the multi-tone mask adjusts the amount of transmitted light in the light-transmitting part to be large in the edge area and small in the middle area; then, an exposure and development process is performed.

[0089] The shape pattern of the spacer groove 610 of the spacer portion 600 can also be formed by transfer printing, that is, the spacer portion 600 solution is coated, and then low-temperature pre-curing is performed, and a roller with a pattern is used to roll to obtain the required pattern of the spacer groove 610, and then the spacer portion 600 material in the unnecessary place above the black matrix unit 300 is removed by an exposure and development process.

[0090] And in the step S3: preparing the black matrix unit 300 on the pixel definition layer 120; the previous steps also include:

[0091] S23: Disposing the light absorbing unit on the pixel definition layer.

[0092] Among them, the material of the light absorbing unit 700 is also composed of black color resist, which is equivalent to setting up two layers of black color resist, and because the area of ​​the light absorbing unit 700 below is larger than the area of ​​the black matrix unit 300, the refracted light will be absorbed at the step surface formed between the light absorbing unit 700 and the black matrix unit 300, thereby greatly improving the effect of the display panel 30 in preventing reflection of external light.

[0093] When the light transmittance of the light absorbing unit 700 is controllable, the step S23: arranging the light absorbing unit on the pixel definition layer. The step also includes:

[0094] S231: Disposing an electrochromic layer on the pixel definition layer;

[0095] S232: Disposing a transparent electrode on the electrochromic layer.

[0096] Compared with the solution in which the light absorbing unit 700 is directly composed of black color resist material, this solution realizes controllable transmittance of the light absorbing unit 700 by combining the transparent electrode 710 and the electrochromic layer 720. When the display panel 30 displays an image, the transmittance of the light absorbing unit 700 can be controlled to increase, thereby not affecting the aperture ratio of the display panel 30; when the display panel 30 does not display an image, the transmittance of the light absorbing unit 700 can be controlled to decrease, thereby not affecting the anti-light reflection effect of the display panel 30.

[0097] It should be noted that the limitations on the various steps involved in this solution, without affecting the implementation of the specific solution, are not deemed to limit the order of the steps. The steps written in front can be executed first, or later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0098] It should be noted that the inventive concept of the present application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effects will be enhanced.

[0099] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A display panel, comprising a substrate, an active switch layer, a pixel definition layer and a light-emitting unit, wherein the active switch layer is arranged on the substrate, the pixel definition layer is arranged on the active switch layer, and is arranged corresponding to the non-opening area of ​​the display panel; the light-emitting unit is arranged on the active switch layer, and is arranged corresponding to the opening area of ​​the display panel; characterized in that: The display panel further comprises a filter layer, the filter layer is arranged on a side of the pixel definition layer and the light emitting unit away from the substrate, the filter layer comprises a black matrix unit and a filter unit, the black matrix unit corresponds to the pixel definition layer one-to-one, the filter unit corresponds to the light emitting unit one-to-one, the filter unit comprises a filter part and a spacer part which are stacked, the spacer part is located on a side of the filter part facing the substrate, the material of the filter part comprises a color resist material, and the refractive index of the filter part is less than the refractive index of the spacer part; The side of the spacer portion close to the filter portion is concave inwardly toward the substrate to form a spacer groove, and the side of the filter portion close to the spacer portion is convex inwardly toward the substrate to form a filter protrusion, and the shape of the filter protrusion matches the shape of the spacer groove; Taking the direction of the substrate toward the light-emitting unit as the first direction, the minimum thickness of the spacer portion along the first direction is H1, the maximum thickness of the spacer portion along the first direction is H2, and the thickness of the black matrix unit along the first direction is H3, wherein H1 is greater than 1 / 4 of H3 and less than 1 / 2 of H3; H2 is less than 3 / 4 of H3 and greater than 1 / 2 of H3; The shape of the spacer groove is an inverted trapezoid, the spacer groove includes a spacer bottom surface and a spacer side surface, the spacer side surface is connected to the edge of the spacer bottom surface, and the angle between the spacer side surface and the spacer bottom surface is an obtuse angle; the shape of the filter protrusion is an inverted trapezoid, the filter protrusion includes a filter top surface and a filter side surface, the filter side surface is connected to the edge of the filter top surface, and the angle between the filter side surface and the filter top surface is an obtuse angle; The light filtering top surface is in contact with the spacer bottom surface, and the light filtering side surface is in contact with the spacer side surface.

2. The display panel according to claim 1, characterized in that: The material of the spacer portion includes a color resist material, and the color resist material includes red, green and blue color resists.

3. The display panel according to claim 1, characterized in that: The material of the spacer portion includes a transparent anti-reflection material, and the transparent anti-reflection material includes one or more combinations of transparent polyimide organic material, silicon monoxide, silicon nitride, magnesium fluoride, titanium dioxide, and aluminum oxide.

4. The display panel according to claim 1, characterized in that: The side of the filter portion facing away from the spacer portion is concave inwardly toward the substrate to form a filter groove.

5. The display panel according to claim 1, characterized in that: The display panel further includes a light absorbing unit, the light absorbing unit corresponds to the black matrix unit one by one, and the black matrix unit is stacked on a side of the light absorbing unit away from the substrate; The orthographic projection of the light absorbing unit on the substrate covers the orthographic projection of the black matrix unit on the substrate, and the orthographic projection area of ​​the light absorbing unit on the substrate is larger than the orthographic projection area of ​​the black matrix unit on the substrate; Wherein, the light absorbing unit is used to absorb light.

6. The display panel according to claim 5, characterized in that: The light absorbing unit includes a transparent electrode and an electrochromic layer stacked together, the transparent electrode is located between the electrochromic layer and the black matrix unit, the material of the electrochromic layer includes an electrochromic material, and the transparent electrode drives the light transmittance of the electrochromic layer to change.

7. A method for preparing a display panel, characterized in that: For preparing the display panel according to any one of claims 1 to 6, comprising the steps of: preparing the active switching layer on the substrate; Preparing the pixel definition layer and the light-emitting unit on the active switch layer; Preparing the black matrix unit on the pixel definition layer; preparing the spacer portion on the light-emitting unit; preparing the filter portion on the spacer portion to form the filter layer; The pixel definition layer corresponds to the non-opening area; and the light-emitting unit corresponds to the opening area.

8. A display device, comprising a driving circuit, characterized in that: The display device further comprises a display panel as claimed in any one of claims 1 to 6, and the driving circuit is connected to the display panel.

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