CN116528626A - Display module and display device - Google Patents
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- CN116528626A CN116528626A CN202310483564.4A CN202310483564A CN116528626A CN 116528626 A CN116528626 A CN 116528626A CN 202310483564 A CN202310483564 A CN 202310483564A CN 116528626 A CN116528626 A CN 116528626A
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
Abstract
The application provides a display module assembly and display device, the display module assembly includes display substrate and antireflection coating layer. The display substrate includes a base, a pixel defining layer, a plurality of light emitting devices, and a package structure. The pixel defining layer is positioned on one side of the substrate and provided with a plurality of pixel openings corresponding to the plurality of light emitting devices. The encapsulation structure is located at a surface of the pixel defining layer and a side of the plurality of light emitting devices facing away from the substrate. At least two light emitting devices of the plurality of light emitting devices may emit different color light. The anti-reflection layer is positioned on one side of the packaging structure, which is away from the substrate. The anti-reflection film layer is provided with a plurality of through holes corresponding to the plurality of pixel openings. The anti-reflective coating layer has an opacity, and at least one surface of the anti-reflective coating layer is rugged. According to the anti-reflection film, the total surface area of the anti-reflection film layer is increased by arranging the anti-reflection film layer to be uneven on at least one surface, so that the absorption effect of the anti-reflection film layer on external light is increased, and the contrast ratio and the display effect of the display module are also improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a display module and a display device.
Background
With the development of display technology, there is an increasing demand for performance of display devices such as thinning and display effects. The display module is used as an important component in the display device, and the performance of the display module directly influences the performance of the display device.
The color film structure is generally arranged in the display module to reduce the reflectivity of the display module to external light so as to improve the display effect of the display module. However, the color film structure is limited due to the structural design or material thereof, so that the degree of reduction of the reflectivity of the color film structure to the display module is limited, and the contrast ratio and the display effect of the display module are not improved.
Disclosure of Invention
In view of this, the present application provides a display module and a display device, through setting up at least one surface of antireflection coating layer in the display module and being the roughness and increasing the absorption effect of antireflection coating layer to external light to reduced the reflectivity of display module, improved the contrast and the display effect of display module.
The first aspect of the application provides a display module assembly, which comprises a display substrate and an anti-reflection film layer. The display substrate includes a base, a pixel defining layer, a plurality of light emitting devices, and a package structure. The pixel defining layer is positioned on one side of the substrate and provided with a plurality of pixel openings corresponding to the plurality of light emitting devices. The encapsulation structure is located at a surface of the pixel defining layer and a side of the plurality of light emitting devices facing away from the substrate. At least two light emitting devices of the plurality of light emitting devices may emit different color light. The anti-reflection layer is positioned on one side of the packaging structure, which is away from the substrate. The anti-reflection film layer is provided with a plurality of through holes corresponding to the plurality of pixel openings. The anti-reflective coating layer has an opacity, and at least one surface of the anti-reflective coating layer is rugged.
In the above scheme, the anti-reflection film layer is arranged on one side, away from the substrate, of the packaging structure in the display module, and at least one surface of the anti-reflection film layer is uneven, so that the total surface area of the anti-reflection film layer is increased, the absorption effect of the anti-reflection film layer on light rays such as external light rays or reflected light rays after the external light rays are reflected by the inside of the display module is also increased, the reflectivity of the display module is further reduced, and the contrast ratio and the display effect of the display module are also improved.
In a specific embodiment of the first aspect of the present application, the surface of the anti-reflective coating layer facing away from the substrate is rugged.
In one embodiment of the first aspect of the present application, the anti-reflective coating layer includes a flat portion and a raised portion located on the flat portion.
In a specific embodiment of the first aspect of the present application, the flat portion and the protruding portion are of different materials.
In a specific embodiment of the first aspect of the present application, the cross-sectional shape of the protruding portion includes any one or more of a semicircle, a triangle, a parallelogram, a regular trapezoid, an inverted trapezoid, and an irregular pattern along a plane perpendicular to the plane in which the display module is located.
In a specific embodiment of the first aspect of the present application, an included angle between the side surface of the flat portion and the plane where the display module is located is greater than an included angle between the side surface of the protruding portion and the plane where the display module is located.
In a specific embodiment of the first aspect of the present application, an included angle between a side surface of the flat portion and a plane in which the display module is located ranges from 45 ° to 90 °.
In a specific embodiment of the first aspect of the present application, the included angle between the side surface of the protruding portion and the plane where the display module is located is in a range of 30 ° to 89 °.
In a specific embodiment of the first aspect of the present application, the absorbance of the antireflection film layer is not less than 3.
In a specific embodiment of the first aspect of the present application, the material of the anti-reflective coating layer comprises a black colorant.
In a specific embodiment of the first aspect of the present application, the front projection of the surface of the anti-reflective film layer facing the substrate coincides with the front projection of the surface of the pixel defining layer facing the substrate on the substrate, or the front projection of the surface of the anti-reflective film layer facing the substrate on the substrate is located within the front projection of the surface of the pixel defining layer facing the substrate on the substrate.
In a specific embodiment of the first aspect of the present application, the pixel defining layer has light opacity.
In a specific embodiment of the first aspect of the present application, the absorbance of the pixel defining layer is not less than 3.
In a specific embodiment of the first aspect of the present application, the material of the pixel defining layer comprises a black matrix material.
In a specific embodiment of the first aspect of the present application, the display module further includes a planarization layer. The planarization layer covers the anti-reflection film layer, has light transmittance, and is configured to planarize the anti-reflection film layer.
In a specific embodiment of the first aspect of the present application, the absorbance of the planarization layer is not greater than 0.34.
In a specific embodiment of the first aspect of the present application, the material of the planarization layer comprises a mixture of optically transparent adhesive and black matrix material.
In a specific embodiment of the first aspect of the present application, the maximum linear distance between the surface of the planarizing layer facing away from the substrate and the surface facing the substrate is no more than 10 μm.
In a specific embodiment of the first aspect of the present application, the display module further includes a protective cover plate. The protective cover plate is positioned on one side of the anti-reflection film layer, which is away from the packaging structure.
A second aspect of the present application provides a display device, which includes the display module of the first aspect.
Drawings
Fig. 1 is a schematic plan view of a display module.
Fig. 2 is an enlarged sectional view of a portion of the display module shown in fig. 1, taken along A1-A2.
Fig. 3 is a schematic plan view of a display module according to an embodiment of the disclosure.
Fig. 4 is an enlarged cross-sectional view of the portion of the display module shown in fig. 3 along the line B1-B2.
Fig. 5 is a schematic diagram showing another enlarged cross-sectional structure of the display module shown in fig. 3, wherein the portion located in the region P is taken along the line B1-B2.
Fig. 6 is a schematic diagram showing an enlarged cross-sectional view of a portion of the display module shown in fig. 3, the portion being located in the region P, along the line B1-B2.
Fig. 7 is a schematic diagram showing an enlarged cross-sectional view of a portion of the display module shown in fig. 3, the portion being located in the region P, along the line B1-B2.
Fig. 8 is a schematic diagram showing another enlarged cross-sectional structure of the portion of the display module shown in fig. 3 located in the region P along the line B1-B2.
Fig. 9 is a schematic diagram showing still another enlarged cross-sectional structure of the portion of the display module shown in fig. 3 located in the region P along the line B1-B2.
Fig. 10 is a schematic plan view of a display module according to another embodiment of the disclosure.
Fig. 11 is an enlarged cross-sectional view of the display module shown in fig. 10, taken along C1-C2.
Fig. 12 is a schematic view of another enlarged cross-sectional structure of the display module shown in fig. 10, taken along C1-C2.
Fig. 13 is a schematic cross-sectional enlarged structure of a display module according to an embodiment of the disclosure.
Fig. 14 is a schematic cross-sectional enlarged structure of a display module according to another embodiment of the disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the space rectangular coordinate system, the X axis is the width direction of the display module, the Y axis is the length direction of the display module, the X axis and the Y axis are parallel to the plane of the display module, and the Z axis is the direction perpendicular to the plane of the display module. In addition, "thickness" is defined with reference to the substrate, for example, for an object located on one side of the substrate, the difference between the vertical distance from the end of the object furthest from the substrate to the substrate and the vertical distance from the end closest to the substrate is the thickness of the object. It should be noted that the thickness of each structure in the display module is merely exemplary, and may be adjusted according to practical situations.
External light rays are usually reflected, such as specular reflection, when passing through the interface of the metal component or the film layer in the display module, and these reflected light rays enter eyes of observers, so that the contrast ratio of the display module is reduced, and the display effect of the display module is also reduced. Specular reflection is a phenomenon in which a plurality of parallel rays of light are incident on the surface of an object and are reflected in one direction in parallel. The metal member includes, but is not limited to, at least one of a bottom light shielding portion, a source-drain electrode, a capacitor electrode, a cathode, and the like.
In order to reduce the reflectivity of the structure of the display module to external light and improve the contrast ratio and display effect of the display module, a circular polarizer (Circular Polarizer, C-POL) is generally disposed in the display module. For example, C-POL includes a linear polarizer and a quarter-wave plate. The external light becomes first linearly polarized light after passing through the linear polarizing plate, the first linearly polarized light becomes first circularly polarized light after passing through the quarter wave plate, the first circularly polarized light becomes second circularly polarized light with opposite rotation directions after being reflected by a metal electrode or a film layer interface and the like, the second circularly polarized light becomes second linearly polarized light with the polarization direction perpendicular to the polarization direction of the first linearly polarized light after passing through the quarter wave plate, and the second linearly polarized light cannot pass through the linear polarizing plate, so that reflection interference of the external light is restrained.
However, the thickness of C-POL is too thick due to the limitation of the structural design or material of the C-POL itself, for example, the thickness of C-POL is greater than 50 μm, further, for example, the thickness of C-POL ranges from 50 μm to 100 μm, and for example, the thickness of C-POL is greater than 100 μm, and thus, the presence of C-POL is disadvantageous for the thinning of the display module. In addition, since the transmittance of the C-POL is only about 45%, the power consumption performance of the display module is affected by the existence of the C-POL. In addition, the bending resistance of the C-POL is poor, so that the display module is not suitable for flexible application scenes such as folding, curling and the like, and the development of the display module in the flexible application scenes such as folding, curling and the like is limited by the existence of the C-POL.
In one approach, a Color Filter (CF) and Black Matrix (BM) approach (i.e., color On Encapsulation, COE) is fabricated on the package structure of the display module instead of C-POL. The transmittance of CF can be increased to 70% with respect to the display module including C-POL, so that power consumption (related to factors such as transmittance and pixel opening) is reduced by about 15%, and in addition, the thickness of CF can be effectively reduced to 10 μm or less, even 5 μm or less, so that the display module including CF is thinner and more suitable for flexible products such as folding or curling.
Referring to fig. 1 and 2, the display module 100 includes a substrate 110, a pixel defining layer 120, a plurality of light emitting devices 130, a package structure 140, and a color film structure 150. The pixel defining layer 120 and the plurality of light emitting devices 130 are located at one side of the substrate 110. The encapsulation structure 140 is located at a side of the pixel defining layer 120 and the plurality of light emitting devices 130 facing away from the substrate 110. The color film structure 150 is located on a side of the package structure 140 facing away from the substrate 110. The color film structure 150 includes a black matrix 151, a red filter 152, a blue filter 153, a green filter 154, and a glue layer 155. It should be noted that the plurality of light emitting devices 130 may emit light of the same color, and at least two light emitting devices of the plurality of light emitting devices 130 may emit light of different colors.
However, through careful study, it is found that the black matrix 151 is adopted in the color film structure 150 to reduce the reflectivity of the display module 100, but the surface of the black matrix 151 is flat, so that the degree of reduction of the reflectivity of the color film structure 150 to the display module is limited due to the limitation of the self structural design of the black matrix 151 and other factors.
In order to solve at least one of the above problems, the present application provides a display module and a display device, wherein an anti-reflective coating layer is disposed on a side of a packaging structure facing away from a substrate in the display module, and at least one surface of the anti-reflective coating layer is uneven, so that a total surface area of the anti-reflective coating layer is increased, an absorption effect of the anti-reflective coating layer on light rays such as external light rays or reflected light rays after the external light rays are internally reflected by the display module is also increased, reflectivity of the display module is reduced, and contrast ratio and display effect of the display module are improved.
At least one embodiment of the present application provides a display module 200, exemplarily referring to fig. 3 to 9, including a display substrate 210 and an anti-reflective coating layer 220. The display substrate 210 includes a base 211, a pixel defining layer 212, a plurality of light emitting devices 213, and a package structure 214. The pixel defining layer 212 is located at one side of the substrate 211 and is provided with a plurality of pixel openings K corresponding to the plurality of light emitting devices 213. The encapsulation structure 214 is located at a surface of the pixel defining layer 212 and a side of the plurality of light emitting devices 213 facing away from the substrate 211. At least two light emitting devices of the plurality of light emitting devices 213 may emit different color lights. The anti-reflective coating layer 220 is located on a side of the encapsulation structure 214 facing away from the substrate 211. The anti-reflective coating layer 220 is provided with a plurality of through holes S corresponding to the plurality of pixel openings K. The anti-reflection film layer 220 has light opacity, and at least one surface of the anti-reflection film layer 220 is rugged. In this way, by providing the antireflection film layer 220 with the plurality of through holes S corresponding to the plurality of pixel openings K, absorption of light emitted from the light emitting device 213 by the antireflection film layer 220 is avoided. In addition, by providing the anti-reflective film layer 220 with at least one surface being rugged, the total surface area of the anti-reflective film layer 220 is increased, and accordingly, the absorption effect of the anti-reflective film layer 220 on light rays such as external light rays or reflected light rays after the external light rays are reflected by the display module 200, the reflectivity of the display module 200 on light rays such as external light rays or reflected light rays corresponding to the external light rays is effectively reduced, and the contrast ratio and the display effect of the display module 200 are improved.
The substrate 211 may be any one substrate or a combination of two substrates of a low temperature polysilicon (Low Temperature Poly-silicon, LTPS) substrate and an indium gallium zinc oxide (indium gallium zinc oxide, IGZO) substrate. The substrate 211 may have a driving circuit therein for driving the plurality of light emitting devices 213 to emit light of a corresponding color, and for example, the substrate 211 may include a substrate layer, a Barrier layer (Barrier), a Buffer layer (Buffer), a Gate Insulator (GI), a capacitor insulating layer (Capacitance Insulator, CI), a Gate electrode, a source drain electrode, an interlayer dielectric layer (Interlayer Dielectric, ILD), a planarization layer (Planarization Layer, PLN), and the like.
The display module 200 may be a flexible display module or a rigid display module. For example, in some embodiments, the display module 200 is a flexible display module, and the packaging structure 214 may be a packaging film. For another example, in other embodiments where the display module 200 is a rigid display module, the package structure 214 may be a package glass.
At least two light emitting devices of the plurality of light emitting devices 213 may emit light of different colors, and colors of the at least two light emitting devices may be selected according to actual needs, for example, referring to fig. 4 to 8, the plurality of light emitting devices 213 may be divided into a red light emitting device 213a that may emit red light, a green light emitting device 213b that may emit green light, and a blue light emitting device 213c that may emit blue light. The plurality of light emitting devices 213 may be divided into a yellow light emitting device that emits yellow light, a white light emitting device that emits white light, and the like. For example, the wavelength range of the light emitted from the red light emitting device 213a is 622nm to 760nm, the wavelength range of the light emitted from the green light emitting device 213b is 492nm to 577nm, and the wavelength range of the light emitted from the blue light emitting device 213c is 400nm to 450nm.
Referring to fig. 9, the light emitting device 213 may include a first electrode 2131, a light emitting functional layer 2132, and a second electrode 2133 stacked on the substrate 211. The light emitting functional layer 2132 may include a light emitting layer, and further, the light emitting functional layer may further include any one or more of a hole injection layer, a hole transport layer, an electron injection layer, an electron blocking layer, and a hole blocking layer. One of the first electrode 2131 and the second electrode 2133 is an anode, and the other of the first electrode 2131 and the second electrode 2133 is a cathode. An effective light emitting portion of the light emitting layer in the light emitting functional layer 2132 may be located within the pixel opening K.
The anti-reflective coating layer 220 may have light opacity, for example, the anti-reflective coating layer 220 may absorb light rays such as light rays having a wavelength ranging from 400nm to 1000nm, so that when the display module 200 is turned on, the anti-reflective coating layer 220 may absorb external light rays incident on the anti-reflective coating layer 220 or reflected light rays after the external light rays are internally reflected from the display module 200, so that light seen from the front or side of the display module 200 by an observer is uniform, thereby improving or avoiding contrast degradation of the display module 200 due to reflection of the external light rays, and effectively improving display effects of the display module 200.
At least one surface of the anti-reflection film layer 220 may be rugged, and any one or more surfaces of the anti-reflection film layer 220 may be rugged. For example, in some embodiments of the present application, referring to fig. 4 to 9, illustratively, the surface of the anti-reflective coating layer 220 on the side facing away from the substrate 211 is rugged, so that the surface area of the surface of the anti-reflective coating layer 220 on the side facing away from the substrate 211 can be increased, and the absorption of external light by the surface of the anti-reflective coating layer 220 on the side facing away from the substrate 211 can be enhanced. For another example, in other embodiments of the present application, referring to fig. 6, illustratively, the surface of the anti-reflective coating layer 220 facing the substrate 211 is rugged, so that the surface area of the surface of the anti-reflective coating layer 220 facing the substrate 211 can be increased, and the absorption effect of the surface of the anti-reflective coating layer 220 facing the substrate 211 on the reflected light corresponding to the external light can be enhanced. As another example, in still other embodiments of the present application, referring to fig. 6, illustratively, the surface of the anti-reflective coating layer 220 facing away from the substrate 211 and the surface of the anti-reflective coating layer 220 facing toward the substrate 211 are both rugged, thus increasing the surface area of the surface of the anti-reflective coating layer 220 facing toward the substrate 211 and the surface area of the surface of the anti-reflective coating layer 220 facing toward the substrate 211, and further enhancing the absorption of external light by the anti-reflective coating layer 220.
In some embodiments, the rugged surface in the anti-reflective coating layer 220 may be formed by screen printing, nanoimprinting, laser sintering, or etching, etc. using the material of the anti-reflective coating layer 220.
In at least one embodiment of the present application, the material of the anti-reflective coating layer 220 includes a black colorant, for example, black colorant including, but not limited to, any one or more of carbon black, graphene, carbon titanium, graphite, metal particles (e.g., iron, chromium, or manganese, etc.), metal oxide particles (e.g., iron oxide, titanium suboxide, etc.), and as such, the black colorant may be utilized to increase the absorbance of the anti-reflective coating layer 220.
The antireflection film layer 220 may be a single film layer or a plurality of film layers, and for example, the antireflection film layer 220 may be a continuous whole film layer or a plurality of antireflection portions provided at intervals, so long as at least one surface of the antireflection film layer 220 is uneven, and the antireflection film layer 220 is not particularly limited in this application. In the following, the case where the antireflection film layer 220 is a single film layer or a multilayer film layer is exemplified in combination with several embodiments.
For example, in some embodiments, referring to fig. 4 and 5, for example, the anti-reflective coating layer 220 may be provided with a plurality of blind holes, such that the anti-reflective coating layer 220 may be a continuous integral film layer, and at least one surface of the anti-reflective coating layer 220 may be rugged.
For another example, in other embodiments, the anti-reflective coating layer 220 includes a flat portion 221 and a protrusion portion 222 located on the flat portion 221, and as an example, referring to fig. 7 to 9, the flat portion 221 and the protrusion portion 222 may be prepared separately, for example, the flat portion 221 is prepared first, and then the protrusion portion 222 is prepared by using a mask or the like, so as to ensure structural uniformity of the protrusion portion 222 and uniform distribution on the flat portion 221.
The flat portion 221 may be a portion of the antireflection film layer 220 having no uneven surface. The surface of the flat portion 221 facing away from the substrate 211 and the surface facing the substrate 211 may be parallel to the plane of the display module 200.
The number of the flat portions 221 may be one or more, for example, the flat portions 221 may be a continuous whole film layer, and for example, the flat portions 221 may also include a plurality of sub-flat portions disposed at intervals.
In the Z-axis direction, the thickness of the flat portion 221 may be greater than 1/2 of the thickness of the anti-reflective film layer 220, for example, the thickness of the flat portion 221 may range from 1.5 μm to 5 μm, so that, on one hand, the thickness of the flat portion 221 may be prevented from being too small to cause insufficient absorption of external light or reflected light corresponding to the external light by the flat portion 221, and on the other hand, the thickness of the flat portion 221 may be prevented from being too large to be unfavorable for thinning the display module 200.
The raised portion 222 may be a raised portion of the anti-reflective coating layer 220. The number of the protrusions 222 may be one or more, for example, if the number of the protrusions 222 is one, the protrusions 222 may constitute a porous structure, and for example, if the number of the protrusions 222 is a plurality, the plurality of protrusions 222 may constitute a multi-island structure.
Taking the surface of the flat portion 221 facing away from the substrate 211 and the plane where the display module 200 is located as an example, the thickness of the protruding portion 222 on the surface of the flat portion 221 facing away from the substrate 211 may be less than 1/2 of the thickness of the anti-reflective film layer 220 in the direction along the Z axis, for example, the thickness of the protruding portion 222 may range from 1 μm to 3 μm, so that on one hand, the thickness of the protruding portion 222 may be too small to make the absorption or refraction of the protruding portion 222 on the external light or the reflected light corresponding to the external light insufficient, and on the other hand, the thickness of the flat portion 221 may be too large to be unfavorable for the thinning of the display module 200.The width of the convex portion 222 may be not more than 3 μm, for example, 1 μm to 3 μm in the direction along the X-axis, and thus, it is advantageous to provide more convex portions 222 on the flat portion 221 to absorb external light or refract external light to the flat portion 221. Minimum linear distance d between two adjacent bosses 222 1 It may be no greater than 3 μm, for example, 1 μm to 3 μm, and referring to fig. 4, 5, and 7 to 9, for example, more protrusions 222 may be further provided on the flat portion 221, so that it is advantageous to absorb external light or refract external light to the flat portion 221 with more protrusions 222.
The materials of the flat portion 221 and the convex portion 222 may be the same or different. The materials of the flat portion 221 and the convex portion 222 are exemplified below in connection with several specific embodiments.
In some embodiments, the materials of the flat portion 221 and the protruding portion 222 are the same, so that the anti-reflective coating layer 220 can be directly prepared by the same preparation process, which is advantageous for simplifying the preparation process of the anti-reflective coating layer 220. For example, the materials of the flat portion 221 and the convex portion 222 may each have an effect of absorbing light, and further, for example, the materials of the flat portion 221 and the convex portion 222 each include a black colorant, so that the absorbance of the antireflection film layer 220 may be improved.
In other embodiments, the materials of the flat portion 221 and the raised portion 222 are different, so that the flat portion 221 may be formed first, then the material layer used for the raised portion 222 may be formed on the surface of the flat portion 221, then the material layer used for the raised portion 222 may be patterned by using an etching process or the like to form a plurality of raised portions 222, and when the material layers used for the raised portion 222 are prepared by using the etching process or the like to prepare the plurality of raised portions 222, the flat portion 221 is not etched by the etching process or the like, so that the portion between two adjacent raised portions 222 in the material layer used for the raised portion is advantageously etched accurately, and the structural uniformity of the plurality of raised portions 222 is advantageously improved.
For example, the material of the flat portion 221 may include a black colorant. The material of the protruding portion 222 is not particularly limited as long as it is different from the material of the flat portion 221 and has the function of absorbing and/or refracting light. For example, the material of the protrusion 222 includes, but is not limited to, any one or more of silicon oxide, chromium oxide, aluminum oxide, zinc oxide, magnesium oxide, silicon nitride, polyimide, epoxy, acrylate, etc., so that the protrusion 222 may mainly function to refract light while absorbing light, so that the protrusion 222 may be disposed such that external light incident on the protrusion 222 in various directions is refracted to the flat portion 221 more, so that external light refracted to the flat portion 221 may be absorbed by the flat portion 221, further reducing the reflectivity of the display module 200. For another example, the material of the protrusion 222 may include a black colorant different from the flat portion 221, so that the protrusion 222 mainly plays a role of absorbing light, and the provision of the protrusion 222 may increase the surface area of the anti-reflective coating layer 220, so that external light incident into the inside of the display module in various directions is absorbed by the anti-reflective coating layer 220 more.
In at least one embodiment of the present application, the cross-sectional shape of the protrusion 222 includes any one or more of a semicircle (refer to fig. 7), a triangle (refer to fig. 8), a parallelogram, a regular trapezoid, an inverted trapezoid (refer to fig. 9), and an irregular pattern along a plane perpendicular to the plane in which the display module is located.
In at least one embodiment of the present application, the included angle between the side surface of the flat portion 221 and the plane where the display module 200 is located is greater than the included angle between the side surface of the protrusion portion 222 and the plane where the display module 200 is located, so, on one hand, the included angle between the side surface of the protrusion portion 222 and the plane where the display module 200 is located is smaller, so that most of the external light incident on the protrusion portion 222 is refracted to the flat portion 221, the flat portion 221 can absorb more external light, the reflectivity of the display module 200 is further reduced, and on the other hand, the included angle between the side surface of the flat portion 221 and the plane where the display module 200 is located is greater, so that the volume of the flat portion 221 is increased in a certain area, and the absorption effect of the flat portion 221 on the external light is stronger.
The surface of the flat portion 221 contacting the package structure 214 is a bottom surface of the flat portion 221, and a surface of the flat portion 221 adjacent to the bottom surface of the flat portion 221 is a side surface of the flat portion 221. The surface of the boss 222 in contact with the flat portion 221 is the bottom surface of the boss 222, and the surface of the boss 222 adjacent to the bottom surface of the boss 222 is the side surface of the boss 222. If the structure of the protrusion 222 is an arc surface, the included angle between the side surface of the protrusion 222 and the plane of the display module 200 may be the included angle between the tangent line of the side surface of the protrusion 222 and the plane of the display module 200.
In at least one embodiment of the present application, the included angle between the side surface of the flat portion 221 and the plane of the display module 200 is 45 ° to 90 °, so that the volume of the flat portion 221 in a certain area is larger, and external light incident on the flat portion 221 along different directions can be absorbed by using the inclined surface or the vertical surface of the flat portion 221.
In at least one embodiment of the present application, the range of the included angle between the side surface of the protruding portion 222 and the plane where the display module 200 is located is 30 ° to 89 °, further, for example, the range of the included angle is 30 ° to 75 °, so that the path of the external light incident on the protruding portion 222 can be changed by using the inclined surface of the protruding portion 222, and the external light is refracted into the flat portion 221, and the external light is further absorbed by using the flat portion 221, so that the absorption effect of the anti-reflection film layer 220 on the external light is improved, the reflectivity of the display module 200 is reduced, and the contrast ratio and the display effect of the display module 200 are further improved.
Illustratively, referring to fig. 8, the side of the flat portion 221 forms an angle of about 90 ° with the plane of the display module 200, and the side of the protrusion 222 forms an angle of about 60 ° with the plane of the display module 200.
In at least one embodiment of the present application, the absorbance of the anti-reflective coating layer 220 is not less than 3. In this way, it is ensured that the absorption of the anti-reflection film layer 220 to the external light or the reflected light corresponding to the external light is maintained at a high level, so that most of the light incident on the anti-reflection film layer 220 can be absorbed by the anti-reflection film layer 220.
The absorbance refers to the optical density absorbed by a substanceThe degree, absorbance may also be referred to as Optical Density (OD). Transmittance refers to transmitted light intensity I after optically passing through a substance 1 Intensity of incident light I before passing through the substance 0 Is a ratio of (2). The absorbance can be characterized by an optical density value (i.e., OD value), and the relationship between OD value and Transmittance (T) can be expressed as in the following formula (1).
Od=log (I 0 /I 1 )＝-log(I 1 /I 0 ) = -log (T) formula (1)
When the absorbance of the anti-reflection film layer 220 is not less than 3, it can be seen from the above formula (1) that the transmittance T of the anti-reflection film layer 220 is not more than 0.1%, and thus it can be ensured that most of the light incident on the anti-reflection film layer 220 is absorbed by the anti-reflection film layer 220.
The antireflection film layer 220 is provided with a plurality of through holes S corresponding to the plurality of pixel openings K, and the orthographic projection relationship between the antireflection film layer 220 and the pixel defining layer 212 is not particularly limited in this application. In the following, the orthographic projection relationship of the anti-reflective coating layer 220 and the pixel defining layer 212 is illustrated in connection with several embodiments.
For example, in some embodiments of the present application, the front projection of the surface of the anti-reflective coating layer 220 facing the substrate 211 on the substrate 211 coincides with the front projection of the surface of the pixel defining layer 212 facing the substrate 211 on the substrate 211, and referring to fig. 4 and 6, for example, such that the area of the surface of the anti-reflective coating layer 220 facing the substrate 211 is substantially equal to the area of the surface of the pixel defining layer 212 facing the substrate 211, the presence of the anti-reflective coating layer 220 is ensured not to additionally absorb the light emitted by the light emitting device 213, and the transmittance of the light emitted by the light emitting device 213 by the display module 300 is prevented from being reduced due to the presence of the anti-reflective coating layer 220.
For example, in other embodiments of the present application, the front projection of the surface of the anti-reflective coating layer 220 facing the substrate 211 on the substrate 211 is located in the front projection of the surface of the pixel defining layer 212 facing the substrate 211 on the substrate 211, so that the area of the surface of the anti-reflective coating layer 220 facing the substrate 211 is smaller than the area of the surface of the pixel defining layer 212 facing away from the substrate 211, which further ensures that the anti-reflective coating layer 220 does not absorb the light emitted by the light emitting device 213 additionally, and avoids reducing the transmittance of the light emitted by the light emitting device 213 by the display module. The area of the surface of the anti-reflection layer 220 facing the side of the substrate 211 may be greater than 1/2 of the area of the surface of the pixel defining layer 212 facing away from the side of the substrate 211, such that at least a greater than 1/2 of the ambient light directed toward the pixel defining layer 212 is absorbed by the anti-reflection layer 220.
For example, referring to fig. 5 or 8, illustratively, the minimum linear distance d between the outer contour of the front projection of the surface of the antireflection film layer 220 facing the substrate 211 on the substrate 211 and the outer contour of the front projection of the surface of the pixel defining layer 212 facing the substrate 211 on the substrate 211 2 Not more than 5 μm, for example, 1 μm to 5 μm, so that the anti-reflective film layer 220 can be retracted by a certain distance with respect to the pixel defining layer 212, on one hand, the distance of the anti-reflective film layer 220 retracted with respect to the pixel defining layer 212 is prevented from being too large to reduce the absorption of the anti-reflective film layer 220 to external light, and on the other hand, the distance of the anti-reflective film layer 220 retracted with respect to the pixel defining layer 212 is also prevented from being too small to reduce the transmittance of the light emitted by the light emitting device from the display module.
In some embodiments, the width of the portion of the pixel defining layer 120 located between the two light emitting devices 213 may be between 15 μm and 25 μm, for example, if the width of the portion of the pixel defining layer 120 located between the two light emitting devices 213 is 20 μm.
In at least one embodiment of the present application, the maximum linear distance between the surface of the anti-reflective coating layer 220 facing away from the substrate 211 and the surface facing the substrate 211 (i.e., the maximum thickness of the anti-reflective coating layer 220) is not greater than 10 μm in the direction perpendicular to the plane in which the display module 200 is located, for example, the maximum thickness of the anti-reflective coating layer 220 ranges from 3 μm to 10 μm. Therefore, the maximum thickness of the anti-reflective coating layer 220 is smaller than the thickness of the circular polarizer in the conventional display module, which is beneficial to reducing the thickness of the display module 200, and further beneficial to realizing the thinning of the display module 200.
In at least one embodiment of the present application, the pixel defining layer 212 has an opacity. In this way, the pixel defining layer 212 can further absorb part of the external light not absorbed by the anti-reflective film layer 220 or the reflected light corresponding to the external light, so as to further reduce the reflectivity of the display module 200 to the external light, and also improve the contrast ratio and display effect of the display module 200.
In at least one embodiment of the present application, the absorbance of the pixel defining layer 212 is not less than 3. As can be seen from the above formula (1), when the absorbance of the pixel defining layer 212 is not less than 3, the transmittance T of the pixel defining layer 212 is not greater than 0.1%, so that the absorption of the pixel defining layer 212 to the external light or the reflected light corresponding to the external light can be ensured to be kept at a high level, so that most of the external light or the reflected light corresponding to the external light incident on the pixel defining layer 212 can be absorbed by the pixel defining layer 212.
In at least one embodiment of the present application, the material of the pixel defining layer 212 includes a black colorant. In this way, the absorbance of the pixel defining layer 212 can be made not less than 3 by adjusting the mass ratio of the black colorant in the pixel defining layer 212.
The black colorant in the pixel defining layer 212 may be the same as or different from the black colorant in the antireflection film layer 220. In some embodiments, since the preparation temperature (e.g., 180 ℃ to 230 ℃) of the pixel defining layer 212 is generally greater than the preparation temperature (e.g., 80 ℃ to 100 ℃) of the anti-reflective film layer 220, the kind and content of other materials such as an initiator or a prepolymer in the pixel defining layer 212 may be different from those in the anti-reflective film layer 220, as long as the pixel defining layer 212 can be made opaque, and on this basis, the material composition and preparation method of the pixel defining layer 212 are not particularly limited.
Referring again to fig. 1 and 2, further careful study has found that five steps, namely, the preparation of the black matrix 151, the preparation of the red filter 152, the preparation of the blue filter 153, the preparation of the green filter 154, and the preparation of the adhesive layer 155 are generally required in the preparation of the color film structure 150, which makes the preparation process of the display module 100 complicated.
In order to simplify the manufacturing process of the display module, in at least one embodiment of the present application, the display module 300 is different from the display module 200 in that the display module 300 further includes a planarization layer 230. The planarization layer 230 covers the anti-reflection film layer 220, the planarization layer 230 has light transmittance, and the planarization layer 230 is configured to planarize the anti-reflection film layer 220, for example, referring to fig. 10 to 12, the planarization layer 230 covers all the surfaces of the anti-reflection film layer 220 except for the surface facing the package structure 214, and the surface of the side of the planarization layer 230 facing away from the package structure 214 is flat. In this way, the planarization layer 230 has light transmittance, so that most of the light emitted from the light emitting device 213 can pass through the planarization layer 230, and the transmittance of the display module 300 to the light emitted from the light emitting device 213 is improved. In addition, the planarization layer 230 is provided to planarize the anti-reflective coating layer 220, so that the surface of the side of the planarization layer 230 facing away from the substrate 211 is substantially parallel to the plane of the display module 300, and further other structures such as a protective cover plate can be prepared on the surface of the side of the planarization layer 230 facing away from the substrate 211. In addition, by adopting the structure formed by the planarization layer 230 to replace the color filters such as the red filter 152, the blue filter 153 and the green filter 154 in the existing color film structure, since the structure of the planarization layer 230 can be prepared at one time, the color filters generally need to be prepared three times, and thus, in the embodiment of the application, when the display module 300 is prepared, compared with the display module 100, the preparation process of at least two color filters is reduced, so that the preparation process of the display module 300 is simplified.
In at least one embodiment of the present application, the absorbance of the planarization layer 230 is not greater than 0.34, so, as can be seen by combining the above formula (1), the transmittance T of the planarization layer 230 is not less than 45%, so that the transmittance of the light emitting device 213 by the combined structure formed by the planarization layer 230 and the anti-reflective film layer 220 is not lower than the transmittance of the existing C-POL when the thickness of the display module 200 is reduced.
For example, the absorbance of the planarization layer 230 ranges from 0.04 to 0.34, so that the transmittance T of the planarization layer 230 ranges from 45% to 90%, which avoids that the transmittance of the planarization layer 230 is too high to cause the transmittance of the external light at the planarization layer 230 to be too high, and the transmittance of the external light at the planarization layer 230 is too high to cause the reflectance of the display module 300 to be too low, thereby reducing the reflectance of the display module 300 and improving the contrast ratio and the display effect of the display module 300.
In at least one embodiment of the present application, the material of the planarizing layer 230 includes a mixture of optically clear adhesive and a black colorant. In this way, the planarization layer 230 is formed by mixing the optically transparent adhesive and the black colorant, so that the black colorant in the planarization layer 230 is used to absorb the external light incident on the planarization layer 230, for example, the planarization layer 230 is used to absorb the external light in the area where the light emitting device 213 is located or the reflected light corresponding to the external light, thereby further improving the absorption effect of the display module 300 on the external light and reducing the reflectivity of the display module 300 on the external light. In addition, by disposing the optically transparent adhesive in the planarization layer 230, on one hand, a certain transmittance of the planarization layer 230 is ensured, on the other hand, the planarization layer 230 has a certain viscosity, the structure of the planarization layer 230 can be prepared at one time, the adhesive layer 155 is not required to be prepared after the planarization layer 230 is prepared, the preparation steps of the adhesive layer 155 are reduced, and further, the preparation process of the display module 300 is further simplified.
In at least one embodiment of the present application, the maximum linear distance between the surface of the planarization layer 230 facing away from the substrate 211 and the surface facing the substrate 211 (which may also be referred to as the maximum thickness of the planarization layer 230) is not greater than 10 μm, for example, the maximum thickness of the planarization layer 230 ranges from 3 μm to 10 μm, and for example, the maximum thickness of the planarization layer 230 ranges from 1.5 μm to 5 μm. In this way, the thickness of the structure formed by the planarization layer 230 and the anti-reflective coating layer 220 is smaller than that of the circular polarizer in the conventional display module, which is beneficial to reducing the thickness of the display module 200 and further to realizing the thinning of the display module 200. In addition, since the planarization layer 230 covers the anti-reflective coating layer 220, the maximum thickness of the planarization layer 230 can be greater than the maximum thickness of the anti-reflective coating layer 220, and the presence of the anti-reflective coating layer 220 does not additionally increase the thickness of the display module 200.
In at least one embodiment of the present application, referring to fig. 13 and 14, the display module 400 is different from the display module 200 or the display module 300 in that the display module 400 further includes a protective cover 240, for example. The protective cover 240 is located on a side of the anti-reflection film layer 220 away from the package structure 214, for example, referring to fig. 13, the protective cover 240 is located on a surface of the anti-reflection film layer 220 on a side away from the package structure 214, and for example, referring to fig. 14, the protective cover 240 is located on a surface of the anti-reflection film layer 220 on a side away from the package structure 214, and on a surface of the planarization layer 230 on a side away from the package structure 214. In this way, the anti-reflective coating layer 220 is disposed between the packaging structure 214 and the protective cover 240, so that the protective cover 240 is used to protect the anti-reflective coating layer 220 and the light emitting device 213 in the display module 400, thereby reducing the impact of the outside on the display module 400 and prolonging the service life of the display module 400.
The application further provides a display device, which may include the display module set in the above embodiment, and may also include a display module set based on the display module set in the above embodiment after the display module set is replaced or obviously modified.
It should be noted that the display device may be various electronic display products, and specifically may include, but is not limited to, at least one of a mobile phone, a tablet computer, an electronic book reader, a player, a digital camera, a laptop, a vehicle-mounted computer, a desktop computer, a set-top box, a smart television, and a wearable device. In addition, the display device may further include other structures such as a touch layer or an anti-fingerprint layer according to actual needs.
Since the display device in the embodiment of the present application includes all the technical solutions of the embodiments shown in fig. 3 to 14, at least all the technical effects can be achieved, and the description is omitted herein.
It should be noted that, the display module may be the display module in any specific implementation manner in any of the above embodiments, or may be the display module in any of the above embodiments after the display module is replaced or modified obviously.
The combination of the features described in the present application is not limited to the combination described in the claims or the combination described in the specific embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradiction occurs between them.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A display module, comprising:
the display substrate comprises a substrate, a pixel limiting layer, a plurality of light emitting devices and a packaging structure, wherein the pixel limiting layer is positioned on one side of the substrate and is provided with a plurality of pixel openings corresponding to the plurality of light emitting devices, the packaging structure is positioned on the surfaces of the pixel limiting layer and one side, away from the substrate, of the plurality of light emitting devices, and at least two light emitting devices in the plurality of light emitting devices can emit light with different colors; and
and the anti-reflection film layer is positioned on one side of the packaging structure, which is away from the substrate, wherein the anti-reflection film layer is provided with a plurality of through holes corresponding to a plurality of pixel openings, the anti-reflection film layer has light opacity, and at least one surface of the anti-reflection film layer is rugged.
2. The display module assembly of claim 1, wherein the display module assembly comprises,
the surface of the anti-reflection film layer on the side facing away from the substrate is rugged.
3. The display module assembly of claim 1, wherein the display module assembly comprises,
the anti-reflection film layer comprises a flat part and a convex part positioned on the flat part;
preferably, the flat portion and the convex portion are of different materials;
preferably, the cross-sectional shape of the protruding portion includes any one or more of a semicircle, a triangle, a parallelogram, a regular trapezoid, an inverted trapezoid, and an irregular pattern on a plane perpendicular to the plane in which the display module is located.
4. The display module assembly of claim 3, wherein the display module assembly,
the included angle between the side surface of the flat part and the plane where the display module is located is larger than the included angle between the side surface of the protruding part and the plane where the display module is located;
preferably, the included angle between the side surface of the flat part and the plane where the display module is located is 45-90 degrees;
preferably, the included angle between the side surface of the protruding part and the plane where the display module is located is 30-89 degrees.
5. The display module assembly of claim 1, wherein the display module assembly comprises,
The absorbance of the anti-reflection film layer is not less than 3;
preferably, the material of the anti-reflection film layer includes a black colorant.
6. The display module assembly of claim 1, wherein the display module assembly comprises,
the front projection of the surface of the anti-reflection film layer facing the substrate is coincident with the front projection of the surface of the pixel defining layer facing the substrate, or
The orthographic projection of the surface of the anti-reflection film layer facing the substrate is positioned in the orthographic projection of the surface of the pixel defining layer facing the substrate.
7. The display module assembly of claim 1, wherein the display module assembly comprises,
the pixel defining layer has an opacity;
preferably, the absorbance of the pixel defining layer is not less than 3;
preferably, the material of the pixel defining layer comprises a black colorant.
8. The display module of claim 1, further comprising:
a planarization layer covering the anti-reflection film layer, having light transmittance, and configured to planarize the anti-reflection film layer;
preferably, the absorbance of the planarization layer is not more than 0.34;
Preferably, the material of the planarization layer includes a mixture of optically transparent adhesive and black colorant;
preferably, the maximum linear distance between the surface of the planarization layer facing away from the substrate side and the surface facing the substrate side is not more than 10 μm.
9. The display module of claim 1, further comprising:
and the protective cover plate is positioned on one side of the anti-reflection film layer, which is away from the packaging structure.
10. A display device comprising a display module according to any one of claims 1 to 9.
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| CN202310483564.4A CN116528626A (en) | 2023-04-28 | 2023-04-28 | Display module and display device |
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