Display substrate, manufacturing method, gray compensation method, display panel and display device

Abstract

The invention provides a display substrate, a manufacturing method, a gray compensation method, a display panel and a display device. The light-emitting units are located on the driving back plate; the composite film layer is located on the sides, away from the driving backboard, of the multiple light-emitting units; wherein the composite film layer is used for changing the path of light emitted by the plurality of light-emitting units so as to eliminate the visual boundary generated at the transferred splicing position by the light emitted by the plurality of light-emitting units after the plurality of light-emitting units are transferred to the driving backboard through a huge transfer technology. Therefore, through the composite film layer arranged on the display screen, a splicing boundary generated by a huge transfer technology can be eliminated, so that visual invisibility is realized, and the uniformity and the display effect of the whole surface of the display device are improved.

Description

Technical Field

[0001] The present application relates to the technical field of display screens, and in particular to a display substrate and a manufacturing and grayscale compensation method, a display panel, and a display device. Background Art

[0002] Micro LED (Micro Light Emitting Diode), as a new generation of display technology, is gradually becoming a research hotspot in the display industry due to its remarkable characteristics such as self-luminescence, high color gamut and long life. Therefore, the research on mass transfer technology based on Micro LED display screens is particularly important. However, in the process of mass transfer, due to the limitation of transfer size, it is usually necessary to perform multiple mass transfers on the same driving substrate to splice into a whole display screen. The splicing parts in this process may produce obvious visual boundaries (such as Figure 1 This not only affects the overall visual effect, but also reduces the user's viewing experience. Summary of the invention

[0003] The purpose of the present application is to provide a display substrate and a method for manufacturing and grayscale compensation, a display panel, and a display device, so as to solve the technical problem that a display screen formed by mass transfer technology in the related art will produce obvious visual boundaries at the splicing parts of the transfer units, affecting the overall visual effect and reducing the user's viewing experience.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a display substrate, the display substrate comprising:

[0006] Driver backplane;

[0007] and a plurality of light-emitting units located on the driving backplane;

[0008] A composite film layer located on a side of the plurality of light-emitting units away from the driving backplane;

[0009] The composite film layer is used to change the path of light emitted by the multiple light-emitting units to eliminate the visual boundary generated at the transferred joints of light emitted by the multiple light-emitting units after the light is transferred to the driving backplane through mass transfer technology.

[0010] Optionally, the composite film layer includes: a light-homogenizing layer;

[0011] The light-homogenizing layer is located on a side of the plurality of light-emitting units away from the driving backplane, and covers the plurality of light-emitting units;

[0012] The film thickness of the light-homogenizing layer ranges from 5 to 10 um.

[0013] Optionally, the composite film layer further includes: a directional light emitting layer;

[0014] The directional light emitting layer is located on a side of the light uniforming layer away from the driving backplane;

[0015] The directional light-emitting layer is composed of a plurality of trapezoidal bodies, wherein the first trapezoidal body located at the four edges of the directional light-emitting layer is a right-angled trapezoidal body, the side of the rectangle is perpendicular to the driving backplane, and the side opposite to the side of the rectangle is in the shape of a trapezoid;

[0016] The upper surface of the first trapezoidal body is in contact with the light-dotting layer;

[0017] In the directional light-emitting layer, the upper surfaces of the second trapezoidal bodies except the first trapezoidal body are spaced apart from each other and are in contact with the light-uniform layer, and the side surfaces of the second trapezoidal bodies are all in the shape of isosceles trapezoids;

[0018] Wherein, a trapezoidal body is correspondingly arranged on a side of each light emitting unit away from the base substrate.

[0019] Optionally, the composite film layer further comprises: an absorption layer;

[0020] The absorption layer is located on a side of the directional light emitting layer away from the driving backplane;

[0021] The lower surface of the first trapezoidal body and the lower surface of the second trapezoidal body are connected in sequence to form a plane, and the plane is in contact with the absorption layer.

[0022] Optionally, the display substrate further includes: a cover plate;

[0023] The cover plate is located on a side of the absorption layer away from the driving back plate, and covers a surface of the absorption layer away from the driving back plate.

[0024] In a second aspect, an embodiment of the present application provides a display panel, wherein the display panel includes the display substrate described in the first aspect.

[0025] In a third aspect, an embodiment of the present application provides a display device, wherein the display device comprises the display panel described in the second aspect.

[0026] In a fourth aspect, an embodiment of the present application provides a method for manufacturing a display substrate, comprising:

[0027] Provide drive backplane;

[0028] Transferring a plurality of light-emitting units to the driving backplane by means of mass transfer technology;

[0029] forming a composite film layer on the plurality of light-emitting units;

[0030] The composite film layer is used to change the path of light emitted by the multiple light-emitting units to eliminate the visual boundary generated at the transferred joints of light emitted by the multiple light-emitting units after the light is transferred to the driving backplane through mass transfer technology.

[0031] In a fifth aspect, an embodiment of the present application provides a grayscale compensation method for a display substrate, the method being applied to the display panel described in the second aspect, the method comprising:

[0032] Acquire a surface display photo of the display panel;

[0033] A unit to be compensated is determined based on the surface display photo, and grayscale property compensation is performed on the unit to be compensated, wherein the grayscale property includes at least one of the following: grayscale brightness and chromaticity, and the grayscale property compensation includes at least one of the following: grayscale brightness compensation and chromaticity compensation.

[0034] Optionally, performing grayscale property compensation on the unit to be compensated includes:

[0035] Dividing the surface display photo into a plurality of first regions evenly, and taking each first region as a unit to be compensated;

[0036] Calculating the grayscale property value of each unit to be compensated, and determining the grayscale property mean value of all units to be compensated based on the grayscale property value of each unit to be compensated;

[0037] The grayscale property value of each unit to be compensated is compensated by using the grayscale property mean value, and the grayscale property values ​​after compensation are all the grayscale property mean value.

[0038] Optionally, the display substrate is a display substrate formed using a mass transfer technology, and the surface display photograph includes at least one splicing line formed by the mass transfer technology; determining a unit to be compensated based on the surface display photograph, and performing grayscale property compensation on the unit to be compensated includes:

[0039] Dividing the surface display photo into at least one second area and at least one third area, and taking each second area as a unit to be compensated, wherein the second area includes at least one stitching line, and the third area does not include a stitching line;

[0040] Calculating the grayscale property value of each unit to be compensated, and randomly selecting a third area from the at least one third area as a reference third area;

[0041] The grayscale property value of the reference third region is calculated, and the grayscale property value of each unit to be compensated is compensated with the grayscale property value of the reference third region, and the compensated grayscale property values ​​are all the grayscale property values ​​of the reference third region.

[0042] Optionally, the method further includes: performing Gamma optimization during the process of compensating the grayscale property of each unit to be compensated.

[0043] In summary, by providing a composite film layer on the display screen and producing a splicing boundary through mass transfer technology, the splicing boundary is made invisible to the naked eye, thereby improving the uniformity of the entire surface of the display device and the display effect.

[0044] In addition, during specific tests, when the product provided by the embodiment of the present application is not lit, the splicing boundary is almost invisible to the eye; when lit, the brightness uniformity and color uniformity of the product can be further improved, the technical indicators can be improved, and the visual effect can be enhanced; and the process is highly mature, low-cost, and has a high feasibility of implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] When with Figure 1 When reading the following detailed description, various aspects of the present application can be easily understood according to the following detailed description. It is carefully considered that various features may not be drawn to scale. In fact, the size of various features can be arbitrarily increased or reduced for the sake of clarity of discussion.

[0046] Figure 1 It is a schematic diagram of visual boundaries generated at the splicing part of a display screen formed by splicing through mass transfer technology in the prior art;

[0047] Figure 2 A schematic diagram of the structure of a display substrate provided in an embodiment of the present application;

[0048] Figure 3 A schematic diagram of the structure of a display substrate provided in an embodiment of the present application;

[0049] Figure 4 A schematic diagram of a display interface of a display device that eliminates visual boundaries provided in an embodiment of the present application;

[0050] Figure 5 A structural block diagram of a display panel provided in an embodiment of the present application;

[0051] Figure 6 A structural block diagram of a display device provided in an embodiment of the present application;

[0052] Figure 7 A flow chart of a method for manufacturing a display substrate provided in an embodiment of the present application;

[0053] Figure 8 A flow chart of a grayscale compensation method for a display substrate provided in an embodiment of the present application;

[0054] Throughout the drawings and the detailed description, common reference numerals are used to indicate the same or similar components. The present application will become more apparent from the following detailed description in conjunction with the drawings. DETAILED DESCRIPTION

[0055] The following disclosure provides many different embodiments or examples for implementing the different features of the provided subject matter. The specific examples of components and arrangements are described below. Of course, these are only examples and are not intended to be restrictive. In the present application, the reference to forming or arranging a first feature on or above a second feature may include an embodiment in which the first feature and the second feature are formed or arranged to be in direct contact, and may also include an embodiment in which other features may be formed or arranged between the first feature and the second feature so that the first feature and the second feature may not be in direct contact. In addition, the present application may repeat reference numerals and / or letters in each example. This repetition is for the purpose of simplicity and clarity and is not intended to limit the relationship between the various embodiments and / or configurations discussed.

[0056] The following is a detailed discussion of embodiments of the present application. However, it should be understood that the present application provides many applicable concepts that can be embodied in a variety of specific environments. The specific embodiments discussed are only illustrative and do not limit the scope of the present application.

[0057] Figure 2 and Figure 3 A display substrate 20 provided according to an embodiment of the present application is shown. Figure 2 and Figure 3 As shown, the display substrate 20 includes:

[0058] Drive backplane 1;

[0059] and a plurality of light emitting units 2 located on the driving backplane 1;

[0060] A composite film layer 3 located on a side of the plurality of light-emitting units 2 away from the driving backplane 1;

[0061] The composite film layer 3 is used to change the path of light emitted by the multiple light-emitting units 2 to eliminate the visual boundary generated at the transferred joints of the light emitted by the multiple light-emitting units 2 after the light is transferred to the driving backplane 1 through the mass transfer technology.

[0062] It should be noted that in order to solve the problems described in the background technology section, the embodiment of the present application adds a layer of composite film layer 3 on the entire surface of the transferred Micro LED lamp (light-emitting unit 2) without affecting the display effect, thereby changing the light output path and achieving the technical effect of eliminating the splicing boundary line.

[0063] The display substrate 20 shown in the embodiment of the present application is now described in detail.

[0064] The driving backplane 1 is mainly used to control and drive the light-emitting units 2, such as LED (Light Emitting Diode), Micro LED or OLED (Organic Light Emitting Diode). The driving backplane 1 is responsible for transmitting electrical signals from a controller or other signal source to each light-emitting unit 2. Through these signals, the driving backplane 1 can control the brightness and color of each light-emitting unit 2. The driving backplane 1 is the basic part of the entire display substrate 20.

[0065] The multiple light-emitting units 2 are the core of the display substrate 20 and are responsible for emitting light to form an image. They are mounted on the driving backplane 1. The multiple light-emitting units 2 may be Micro LED lamps in the embodiment of the present application.

[0066] The composite film layer 3 is located on the side of the multiple light-emitting units 2 away from the driving backplane 1. The composite film layer 3 is formed by encapsulating multiple film layers. The main function of the composite film layer 3 is to change the propagation path of light. Through precise shape design and material selection, the composite film layer 3 can effectively guide the light so that the light distribution is more uniform when passing through the joint.

[0067] It should be noted that when using mass transfer technology to transfer multiple light-emitting units 2 to the driving backplane 1, visual boundaries may be formed at the joints. The composite film layer 3 effectively eliminates these boundaries by changing the path of light, making the entire display area look more coherent and unified; and by optimizing the propagation of light, the composite film layer 3 not only eliminates the boundaries at the joints, but also improves the overall brightness uniformity and color consistency, thereby improving the audience's visual experience.

[0068] The structure of the composite film layer 3 is now described in detail. Figure 3 .

[0069] In a possible implementation, the composite film layer 3 includes: a light uniforming layer 31 , a directional light output layer 32 and an absorption layer 33 .

[0070] The light-evening layer 31 is located on a side of the plurality of light-emitting units 2 away from the driving backplane 1 , and covers the plurality of light-emitting units 2 .

[0071] It should be noted that the main function of the light-evening layer 31 is to evenly process the light emitted by multiple light-emitting units 2 over the entire surface, which means that after the light passes through the light-evening layer 31, it can effectively eliminate the light spots or unevenness caused by the brightness differences between the light-emitting units 2. The light-evening layer 31 transmits the evenly-evened light to the directional light-emitting layer 32 to ensure that the light is output in a regular manner, thereby improving the overall quality of the display effect. The film thickness of the light-evening layer 31 ranges from 5 to 10 microns (μm). This thickness design has been measured and can achieve an effect of almost no light loss. This means that most of the light energy can be effectively utilized, which improves the brightness and efficiency of the display.

[0072] And within this thickness range, the light uniformity layer 31 can achieve optimal light uniformity, ensuring a smoother and more natural display effect, especially when displaying a large area, and can effectively avoid the problem of uneven brightness.

[0073] The light-homogenizing layer 31 is usually made of specific optical materials that have good optical properties and appropriate physical properties. Commonly used materials include: polymer materials: such as polymethyl methacrylate (PMMA) or polycarbonate (PC), etc. These materials have good transparency and processing properties and are suitable for preparing thin films; and in some cases, the light-homogenizing layer 31 may use specific optical coating materials to enhance the scattering effect of light and further improve the uniformity of light; in some cases, the light-homogenizing layer 31 may adopt a microstructure design, such as a micron-level texture or a microstructured surface, to enhance the scattering and diffusion effect of light.

[0074] In a possible implementation, the composite film layer 3 also includes: a directional light emitting layer 32; the directional light emitting layer 32 is located on the side of the light homogenizing layer 31 away from the driving backplane 1; the directional light emitting layer 32 is composed of a plurality of trapezoidal bodies, wherein the first trapezoidal body located at the four edges of the directional light emitting layer 32 is a right-angled trapezoidal body, the side of the rectangle is perpendicular to the driving backplane 1, and the shape of the side opposite to the side of the rectangle is a trapezoid; the upper surface of the first trapezoidal body is in contact with the light homogenizing layer 31; in the directional light emitting layer 32, the upper surfaces of the second trapezoidal bodies except the first trapezoidal body are spaced from each other and are in contact with the light homogenizing layer 31, and the shape of the side faces of the second trapezoidal bodies is an isosceles trapezoid; wherein, a trapezoidal body is correspondingly arranged on the side of each light-emitting unit 2 away from the substrate.

[0075] It should be noted that the directional light emitting layer 32 is made of materials such as PMMA (polymethyl methacrylate), PC (polycarbonate), and PET (polyethylene terephthalate) and is processed according to a specific angle. The directional light emitting layer 32 is composed of a plurality of trapezoidal bodies to form a specific optical structure to guide and adjust the propagation direction of light. The first trapezoidal body is located at the edges of the directional light emitting layer 32 and is in the shape of a right-angled trapezoid. The side of the rectangle is perpendicular to the driving backplane 1, such as Figure 3 As shown, the reason for this design is that there is no need to make complex adjustments to the light path at the edge of the display screen. The focus of the design is to ensure that the light can pass through effectively without causing any obstruction, and the upper surface of the first trapezoidal body is closely fitted with the lower surface of the light-evening layer 31, ensuring that the light can overlap seamlessly when it is transmitted from the light-evening layer 31 to the directional light-emitting layer 32, which can effectively reduce light loss and ensure that the light is not blocked or scattered when passing through the directional light-emitting layer 32, thereby maintaining brightness and uniformity. The simplified design of the edge area makes the manufacturing process more efficient. At the same time, the rectangular side is perpendicular to the driving backplane 1, which also reduces potential optical errors. The side shape of the second trapezoidal body is an isosceles trapezoid, and its upper surfaces are spaced from each other and are all fitted with the light-evening layer 31. The hypotenuse angle of the right-angled trapezoid is consistent with the hypotenuse angle of the isosceles trapezoid. Such a design allows the light to be refracted and guided at a specific angle when passing through the second trapezoidal body, thereby optimizing the directionality of the light.

[0076] It should be noted that a trapezoidal body (such as Figure 3 As shown, RGB is a light-emitting unit 2), and this one-to-one corresponding design ensures that the light emitted by each light-emitting unit 2 can be effectively guided and focused, thereby improving the light utilization efficiency.

[0077] In a possible implementation, the composite film layer 3 also includes: an absorption layer 33; the absorption layer 33 is located on the side of the directional light output layer 32 away from the driving backplane 1; the lower surface of the first trapezoidal body is connected in sequence with the lower surfaces of the remaining trapezoidal bodies except the trapezoidal bodies at the four edges to form a plane, and the plane is in contact with the absorption layer 33.

[0078] It should be noted that the absorption layer 33 is located on the side of the directional light emitting layer 32 away from the driving backplane 1. Through this layout, the absorption layer 33 can effectively process the light from the directional light emitting layer 32. The lower surface of the first trapezoidal body and the lower surface of the second trapezoidal body are connected in sequence to form a plane, which is in contact with the absorption layer 33, ensuring that the light can be smoothly transmitted to the absorption layer 33 after passing through the directional light emitting layer 32, and effectively absorbed there.

[0079] The main functions of the absorption layer 33 are twofold. On the one hand, it can support the directional light emitting layer during the production process (e.g. Figure 3 As shown, because the directional light emitting layer 32 is a trapezoidal structure, it needs the support of the absorption layer 33. On the other hand, it can absorb the light incident from the top of the display, reducing the glare and light pollution caused by the reflection of light. This not only improves the brightness of the display, but also reduces possible light interference, thereby improving the clarity and contrast of the image, improving the user's viewing experience, and by reducing the reflection and waste of light, the absorption layer 33 helps to improve the energy efficiency of the display. Under the same power consumption, the display can provide higher brightness and better visual effects; the design of the absorption layer 33 can also improve the color performance of the display. By effectively absorbing excess light, the absorption layer 33 ensures the purity and accuracy of the color, making the display effect more vivid and realistic.

[0080] The material selection of the absorption layer 33 is the key to its performance. Commonly used absorption layer 33 materials include: polyurethane or polypropylene, which can effectively absorb visible light and infrared light. Such materials not only have good optical absorption properties, but also have good durability and processability; carbon-based materials are also commonly used in the absorption layer 33. These materials have excellent light absorption capabilities and can effectively reduce reflected light; special optical coatings can also be applied to the absorption layer 33 to improve its light absorption efficiency. Such coatings usually have specific spectral characteristics and can absorb light of specific wavelengths.

[0081] In a possible implementation, the display substrate 20 further includes: a cover plate; the cover plate is located on a side of the absorption layer 33 away from the driving backplane 1 , and covers a surface of the absorption layer 33 away from the driving backplane 1 .

[0082] It should be noted that the cover plate is located on the side of the absorption layer 33 away from the driving backplane 1, and directly covers the surface of the absorption layer 33. This design ensures that the cover plate can effectively protect the absorption layer 33 and the structure below it, while also providing a complete display interface. The main function of the cover plate is to protect the internal components, including the absorption layer 33, the directional light emitting layer 32 and other optical layers. It can prevent damage to the internal components from external physical impacts, dust and moisture, thereby improving the durability and service life of the display. The cover plate can be designed with materials such as tempered glass.

[0083] The adjustment of the optical path by the composite film layer 3 is now generally described. Specifically, Figure 3As shown in the figure, light path 1 is vertically captured, so it propagates in a straight line without changing the light path; light path 2 is the light path diagram of the light emitted by the light emitting unit 2, passing through films with different refractive indices and trapezoidal angles. Since the refractive index of the directional light emitting layer 32 is large, the emission angle is relatively small. Specifically, light path 2 starts from the light emitting unit 2, passes through the light uniforming layer 31, and reaches the hollow part of the white triangle. At this time, light path 2 is not deflected. After entering the boundary of the blue directional light emitting layer 32 from the hollow part of the white triangle, due to the difference in refractive index, light path 2 is deflected and then passes through the directional light emitting layer 32 ( Figure 3 The light further propagates within the blue isosceles trapezoid shown in the figure) and continues to propagate, and is transmitted from the lower surface of the second trapezoid body, and enters the absorption layer 33. Due to the different refractive indices of the absorption layer 33 and the directional light-emitting layer 32, the light path 2 is further deflected, and then continues to propagate within the absorption layer 33 and then transmits out of the absorption layer 33, and is further deflected. In this way, the light can be guided at a specific angle, thereby optimizing the directionality of the light. In order to ensure the refraction of the light path, the refractive indices of the cloud light layer, the directional absorption layer 33 and the absorption layer 33 need to be inconsistent. Therefore, by changing the light emitting path of the light-emitting unit 2 and weakening part of the light, the uniformity of the display screen can be optically improved, and the visual boundary (such as Figure 4 ), improving the user's visual experience.

[0084] Figure 5 A display panel 50 provided according to an embodiment of the present application is shown. Figure 5 As shown, the display panel 50 includes Figure 2 or Figure 3 The display substrate 20 is shown.

[0085] Figure 6 A display device 60 provided according to an embodiment of the present application is shown. Figure 6 As shown, the display device 60 includes Figure 5 A display panel 50 is shown.

[0086] Figure 7 A method for manufacturing a display substrate according to an embodiment of the present application is shown. Figure 7 As shown, the method includes:

[0087] Step S701, providing a driving backplane;

[0088] Step S702, transferring the plurality of light-emitting units to the driving backplane by means of mass transfer technology;

[0089] Step S703, forming a composite film layer on the plurality of light-emitting units;

[0090] Among them, the composite film layer is used to change the path of light emitted by multiple light-emitting units to eliminate the visual boundary generated at the transferred joints of the light emitted by multiple light-emitting units after the light is transferred to the driving backplane through mass transfer technology.

[0091] In summary, by providing a composite film layer on the display screen and producing a splicing boundary through mass transfer technology, the splicing boundary is made invisible to the naked eye, thereby improving the uniformity of the entire surface of the display device and the display effect.

[0092] In addition, during specific tests, when the product provided by the embodiment of the present application is not lit, the splicing boundary is almost invisible to the eye; when lit, the brightness uniformity and color uniformity of the product can be further improved, the technical indicators can be improved, and the visual effect can be enhanced; and the process is highly mature, low-cost, and has a high feasibility of implementation.

[0093] Figure 8 A grayscale compensation method for a display substrate provided according to an embodiment of the present application is shown. Figure 8 As shown, the method is applied to Figure 5 In the display panel shown, the method includes:

[0094] Step S801, obtaining a surface display photo of the display panel;

[0095] Step S802, determining a unit to be compensated based on the surface display photo, and performing grayscale attribute compensation on the unit to be compensated;

[0096] The grayscale attribute includes at least one of the following: grayscale brightness and chromaticity, and the grayscale attribute compensation includes at least one of the following: grayscale brightness compensation and chromaticity compensation.

[0097] In a possible implementation, step S802, compensating the grayscale property of the unit to be compensated includes: dividing the surface display photo into multiple first areas on an even basis, and using each first area as a unit to be compensated; calculating the grayscale property value of each unit to be compensated, and based on the grayscale property value of each unit to be compensated, determining the grayscale property mean of all units to be compensated; compensating the grayscale property value of each unit to be compensated with the grayscale property mean, and the compensated grayscale property values ​​are all grayscale property mean.

[0098] In one possible implementation, the display substrate is a display substrate formed using mass transfer technology, and the surface display photograph includes at least one stitching line formed by the mass transfer technology; step S802, determining the unit to be compensated based on the surface display photograph, and performing grayscale property compensation on the unit to be compensated includes: dividing the surface display photograph into at least one second area and at least one third area, and taking each second area as a unit to be compensated, wherein the second area includes at least one stitching line; and the third area does not include a stitching line; calculating the grayscale property value of each unit to be compensated, and randomly selecting a third area from at least one third area as a reference third area; calculating the grayscale property value of the reference third area, and compensating the grayscale property value of each unit to be compensated with the grayscale property value of the reference third area, and the compensated grayscale property values ​​are all the grayscale property values ​​of the reference third area.

[0099] It should be noted that, in the process of compensating the grayscale attribute value of each unit to be compensated, Gamma optimization is performed.

[0100] It should be noted that Figure 8 The method shown is based on Figure 2 or Figure 3 Further algorithm optimization of the structure of the display substrate shown can further attenuate and eliminate the stitching boundaries. The principle of the algorithm is to compensate for the grayscale properties of multiple columns of pixels near the splicing point of the light-emitting unit, such as grayscale brightness, chromaticity, etc., so as to reduce the problem of splicing dark areas. First, take a picture of the Micro LED panel and divide it into multiple areas as compensation units. Then, calculate the grayscale brightness mean and chromaticity mean of each unit, and perform correction compensation. At the same time, optimize Gamma to maintain it at 2.2 to meet the visual perception of the human eye, so that different grayscales have the same brightness and color expression.

[0101] Specifically, the two methods shown in the above possible implementations can be used to perform specific grayscale brightness compensation. Method 1 is based on uniform division of surface display photos, without considering the influence of splicing lines. Method 2 focuses on the existence of splicing lines, and divides the surface display photos into a second area (including splicing lines) and a third area (excluding splicing lines), which is more targeted. Method 1 uses the grayscale attribute mean (grayscale brightness mean, chromaticity mean) of all units to be compensated as the basis for compensation, which is suitable for situations with good overall uniformity. Method 2 is more suitable for dealing with local brightness differences caused by splicing lines and can better adapt to local changes. Method 1 compensation is relatively simple and is suitable for situations where the overall brightness difference is not large. Method 2 can deal with local brightness differences more flexibly, especially in the presence of splicing lines. Which method to choose depends on the specific application scenario and the characteristics of the display substrate, and can be selected according to actual needs to further attenuate and eliminate the splicing boundaries and enhance the user's visual experience.

[0102] Unless otherwise specified, spatial descriptions such as "above", "below", "upward", "left", "right", "downward", "top", "bottom", "vertical", "horizontal", "side", "above", "below", "upper", "above", "below" are relative to the orientation shown in the drawings. It should be understood that the spatial descriptions used herein are for illustrative purposes only, and actual embodiments of the structures described herein may be spatially arranged in any orientation or manner, with the limitation that the advantages of the embodiments of the present application are not deviated by such arrangements.

[0103] As used herein, the term "vertical" is used to refer to an upward and downward direction, while the term "horizontal" refers to a direction transverse to the vertical direction.

[0104] As used herein, the terms "approximately," "substantially," "substantially," and "about" are used to describe and explain small variations. When used in conjunction with an event or circumstance, the terms may refer to instances where the event or circumstance occurred precisely as well as instances where the event or circumstance occurred very approximately. For example, when used in conjunction with a numerical value, the terms may refer to a range of variation of less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. For example, if a first numerical value is within a range of variation of less than or equal to ±10% of a second numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%, then the first numerical value may be considered to be "substantially" the same as or equal to the second numerical value. For example, "substantially" vertical may refer to an angular variation range of less than or equal to ±10° relative to 90°, such as less than or equal to ±5°, less than or equal to ±4°, less than or equal to ±3°, less than or equal to ±2°, less than or equal to ±1°, less than or equal to ±0.5°, less than or equal to ±0.1°, or less than or equal to ±0.05°.

[0105] Two surfaces are considered coplanar or substantially coplanar if the displacement between them is no more than 5 μm, no more than 2 μm, no more than 1 μm, or no more than 0.5 μm. A surface is considered substantially flat if the displacement between the highest point and the lowest point of the surface is no more than 5 μm, no more than 2 μm, no more than 1 μm, or no more than 0.5 μm.

[0106] As used herein, the singular terms "a," "an," and "the" may include plural referents unless the context clearly dictates otherwise.

[0107] In addition, amounts, ratios and other numerical values ​​are sometimes presented herein in a range format. It should be understood that such a range format is used for convenience and brevity, and should be flexibly interpreted to include not only the values ​​explicitly specified as the limits of the range, but also all individual values ​​or sub-ranges encompassed within that range, as if each value and sub-range were explicitly specified.

[0108] Although the present application has been described and illustrated with reference to the specific embodiments of the present application, these descriptions and illustrations are not restrictive. It should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the true spirit and scope of the present application as defined by the appended claims. The illustrations may not necessarily be drawn to scale. Due to manufacturing processes and tolerances, there may be differences between the process reproduction in the present application and the actual equipment. There may be other embodiments of the present application that are not specifically described. This specification and drawings should be regarded as illustrative rather than restrictive. Modifications may be made to make specific situations, materials, material compositions, methods or processes suitable for the goals, spirit and scope of the present application. All such modifications are intended to be within the scope of the appended claims. Although the methods disclosed herein have been described with reference to specific operations performed in a specific order, it should be understood that these operations may be combined, subdivided or reordered to form equivalent methods without departing from the teachings of the present application. Accordingly, unless specifically indicated herein, the order and grouping of operations are not limitations of the present application.

Claims

1. A display substrate, characterized in that: The display substrate comprises: Driver backplane; and a plurality of light-emitting units located on the driving backplane; A composite film layer located on a side of the plurality of light-emitting units away from the driving backplane; The composite film layer is used to change the path of light emitted by the multiple light-emitting units to eliminate the visual boundary generated at the transferred joints of light emitted by the multiple light-emitting units after the light is transferred to the driving backplane through mass transfer technology.

2. The display substrate according to claim 1, characterized in that: The composite film layer comprises: a light-homogenizing layer; The light-homogenizing layer is located on a side of the plurality of light-emitting units away from the driving backplane, and covers the plurality of light-emitting units; The film thickness of the light-homogenizing layer ranges from 5 to 10 um.

3. The display substrate according to claim 2, characterized in that: The composite film layer further comprises: a directional light emitting layer; The directional light emitting layer is located on a side of the light uniforming layer away from the driving backplane; The directional light-emitting layer is composed of a plurality of trapezoidal bodies, wherein the first trapezoidal body located at the four edges of the directional light-emitting layer is a right-angled trapezoidal body, the side of the rectangle is perpendicular to the driving backplane, and the side opposite to the side of the rectangle is in the shape of a trapezoid; The upper surface of the first trapezoidal body is in contact with the light-dotting layer; In the directional light-emitting layer, the upper surfaces of the second trapezoidal bodies except the first trapezoidal body are spaced apart from each other and are in contact with the light-uniform layer, and the side surfaces of the second trapezoidal bodies are all in the shape of isosceles trapezoids; Wherein, a trapezoidal body is correspondingly arranged on a side of each light emitting unit away from the base substrate.

4. The display substrate according to claim 3, characterized in that: The composite film layer further comprises: an absorption layer; The absorption layer is located on a side of the directional light emitting layer away from the driving backplane; The lower surface of the first trapezoidal body and the lower surface of the second trapezoidal body are connected in sequence to form a plane, and the plane is in contact with the absorption layer.

5. The display substrate according to claim 4, characterized in that: The display substrate further includes: a cover plate; The cover plate is located on a side of the absorption layer away from the driving back plate, and covers a surface of the absorption layer away from the driving back plate.

6. A display panel, characterized in that: The display panel comprises the display substrate according to any one of claims 1 to 5.

7. A display device, characterized in that: The display device comprises the display panel according to claim 6.

8. A method for manufacturing a display substrate, characterized in that: include: Provide drive backplane; Transferring a plurality of light-emitting units to the driving backplane by means of mass transfer technology; forming a composite film layer on the plurality of light-emitting units; The composite film layer is used to change the path of light emitted by the multiple light-emitting units to eliminate the visual boundary generated at the transferred joints of light emitted by the multiple light-emitting units after the light is transferred to the driving backplane through mass transfer technology.

9. A grayscale compensation method for a display substrate, characterized in that: The method is applied to the display panel according to claim 6, and the method comprises: Acquire a surface display photo of the display panel; A unit to be compensated is determined based on the surface display photo, and grayscale property compensation is performed on the unit to be compensated, wherein the grayscale property includes at least one of the following: grayscale brightness and chromaticity, and the grayscale property compensation includes at least one of the following: grayscale brightness compensation and chromaticity compensation.

10. The grayscale compensation method according to claim 9, characterized in that: Compensating the grayscale property of the unit to be compensated includes: Dividing the surface display photo into a plurality of first regions evenly, and taking each first region as a unit to be compensated; Calculating the grayscale property value of each unit to be compensated, and determining the grayscale property mean value of all units to be compensated based on the grayscale property value of each unit to be compensated; The grayscale property value of each unit to be compensated is compensated by using the grayscale property mean value, and the grayscale property values ​​after compensation are all the grayscale property mean value.

11. The grayscale compensation method according to claim 9, characterized in that: The display substrate is a display substrate formed by using a mass transfer technology, and the surface display photograph includes at least one splicing line formed by the mass transfer technology; Determining a unit to be compensated based on the surface display photo, and performing grayscale property compensation on the unit to be compensated includes: Dividing the surface display photo into at least one second area and at least one third area, and taking each second area as a unit to be compensated, wherein the second area includes at least one stitching line, and the third area does not include a stitching line; Calculating the grayscale property value of each unit to be compensated, and randomly selecting a third area from the at least one third area as a reference third area; The grayscale property value of the reference third region is calculated, and the grayscale property value of each unit to be compensated is compensated with the grayscale property value of the reference third region, and the compensated grayscale property values ​​are all the grayscale property values ​​of the reference third region.

12. The method according to claim 10 or 11, characterized in that: The method further comprises: In the process of compensating the grayscale property of each unit to be compensated, Gamma optimization is performed.

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