Display substrate, display panel and manufacturing method

Abstract

The invention discloses a display substrate, a display panel and a manufacturing method. The display substrate of one embodiment comprises a substrate; the light-emitting device layer is arranged on the substrate and comprises a plurality of sub-pixels arranged in an array, and each sub-pixel comprises a light-emitting unit; the packaging layer is arranged on the light-emitting device layer and comprises a plurality of packaging sub-layers, and the outermost packaging sub-layer far away from the light-emitting device layer is made of an inorganic material; the color filter layer is arranged on the packaging layer; wherein the color filter layer comprises a distributed Bragg reflector transmitting light of different colors and a Bragg filter layer comprising a plurality of first inorganic film layers and second inorganic film layers which are stacked and alternately arranged on a packaging layer, and the refractive index of the first inorganic film layers is smaller than that of the second inorganic film layers. The innermost layer, close to the packaging layer, of the Bragg filter layer is a first inorganic film layer, and the outermost layer, away from the packaging layer, of the Bragg filter layer is a second inorganic film layer. The embodiment of the invention effectively improves the use reliability of a display product, and has practical application value.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display substrate, a display panel and a manufacturing method thereof. Background Art

[0002] With the development of display technology, organic light-emitting diode (OLED) technology has received more and more attention and development. Organic light-emitting diode display devices based on organic light-emitting diode technology have been listed as the next generation display technology with great development prospects due to their advantages such as thinness, lightness, wide viewing angle, active light emission, continuously adjustable light emission color, low cost, fast response speed, low energy consumption, low driving voltage, wide operating temperature range, simple production process, high light emission efficiency and flexible display. Summary of the invention

[0003] In order to solve at least one of the above problems, a first embodiment of the present invention provides a display substrate, comprising:

[0004] substrate;

[0005] A light-emitting device layer is provided on the substrate, wherein the light-emitting device layer includes a plurality of pixel units arranged in an array, each pixel unit includes a plurality of sub-pixels, and each sub-pixel includes a light-emitting unit;

[0006] An encapsulation layer disposed on the light-emitting device layer, the encapsulation layer comprising a plurality of encapsulation sublayers, wherein the outermost encapsulation sublayer away from the light-emitting device layer is made of an inorganic material; and

[0007] A color filter layer is provided on the encapsulation layer; wherein

[0008] The color filter layer includes a distributed Bragg reflector corresponding to each sub-pixel one by one and used to transmit light of different colors. The distributed Bragg reflector includes a Bragg filter layer. The Bragg filter layer includes a plurality of first inorganic film layers and a plurality of second inorganic film layers stacked and alternately arranged on the encapsulation layer. The refractive index of the first inorganic film layer is less than the refractive index of the second inorganic film layer. In addition, the innermost layer of the Bragg filter layer close to the encapsulation layer is the first inorganic film layer, and the outermost layer away from the encapsulation layer is the second inorganic film layer.

[0009] For example, in the display substrate provided in some embodiments of the present application, the distributed Bragg reflector further includes a third inorganic film layer disposed between the encapsulation layer and the Bragg filter layer.

[0010] The third inorganic film layer is configured as a lens corresponding to each sub-pixel one by one, for gathering the emitted light of the light-emitting device layer, and the refractive index of the third inorganic film layer is greater than the refractive index of the first inorganic film layer of the innermost layer of the Bragg filter layer close to the encapsulation layer.

[0011] For example, in the display substrate provided in some embodiments of the present application, the morphology of the lenses corresponding to each sub-pixel is the same, the Bragg filter layer surrounds the lens, and is attached to the surface of the lens away from the encapsulation layer according to the morphology of the lens.

[0012] For example, in the display substrate provided in some embodiments of the present application, the orthographic projection of the Bragg filter layer on the substrate covers the orthographic projection of the corresponding light-emitting unit on the substrate.

[0013] For example, in the display substrate provided in some embodiments of the present application, the orthographic projection of the lens on the substrate covers the orthographic projection of the corresponding light-emitting unit on the substrate.

[0014] For example, in the display substrate provided in some embodiments of the present application, the color filter layer includes a first distributed Bragg reflector for transmitting a first color light, a second distributed Bragg reflector for transmitting a second color light, and a third distributed Bragg reflector for transmitting a third color light;

[0015] The number of inorganic film layers included in the Bragg filter layers of the first distributed Bragg reflector, the second distributed Bragg reflector and the third distributed Bragg reflector is the same or different.

[0016] For example, in the display substrate provided in some embodiments of the present application, the inorganic film layers included in the Bragg filter layers of the first distributed Bragg reflector, the second distributed Bragg reflector, and the third distributed Bragg reflector have the same or different film thicknesses.

[0017] For example, in the display substrate provided in some embodiments of the present application, the thickness of the inorganic film layer is:

[0018]

[0019] Wherein, λ is the wavelength of the color light transmitted by the Bragg filter layer to which the inorganic film layer belongs, and n is the refractive index of the inorganic film layer.

[0020] For example, in the display substrate provided in some embodiments of the present application, the color filter layer further includes an auxiliary filter layer located between two adjacent distributed Bragg reflectors.

[0021] The auxiliary filter layer includes at least two Bragg filter layers of the distributed Bragg reflector.

[0022] For example, in the display substrate provided in some embodiments of the present application, the color filter layer includes a first distributed Bragg reflector for transmitting a first color light, a second distributed Bragg reflector for transmitting a second color light, and a third distributed Bragg reflector for transmitting a third color light;

[0023] The auxiliary filter layer includes a Bragg filter layer of a first distributed Bragg reflector, a Bragg filter layer of a second distributed Bragg reflector, and a Bragg filter layer of a third distributed Bragg reflector, which are stacked on the packaging layer.

[0024] For example, in some embodiments of the present application, the display substrate further includes a planarization layer covering the color filter layer, and the refractive index of the planarization layer is smaller than the refractive index of the outermost second inorganic film layer of the Bragg filter layer away from the encapsulation layer.

[0025] A second embodiment of the present invention provides a display panel, including the display substrate described in the first embodiment.

[0026] A third embodiment of the present invention provides a method for manufacturing the display substrate as described in the first embodiment, comprising:

[0027] forming a light-emitting device layer on a substrate, wherein the light-emitting device layer comprises a plurality of pixel units arranged in an array, each pixel unit comprises a plurality of sub-pixels, and each sub-pixel comprises a light-emitting unit;

[0028] forming an encapsulation layer on the light-emitting device layer, wherein the encapsulation layer comprises a plurality of encapsulation sublayers, and the outermost encapsulation sublayer away from the light-emitting device layer is an inorganic material;

[0029] A color filter layer is formed on the encapsulation layer, the color filter layer includes a distributed Bragg reflector corresponding to each sub-pixel one by one and used to transmit light of different colors, the distributed Bragg reflector includes a Bragg filter layer, the Bragg filter layer includes a plurality of first inorganic film layers and a plurality of second inorganic film layers stacked and alternately arranged on the encapsulation layer, the refractive index of the first inorganic film layer is less than the refractive index of the second inorganic film layer, and the innermost layer of the Bragg filter layer close to the encapsulation layer is the first inorganic film layer, and the outermost layer away from the encapsulation layer is the second inorganic film layer.

[0030] For example, in the manufacturing method provided in some embodiments of the present application, the forming of the color filter layer on the encapsulation layer further includes:

[0031] forming a third inorganic film layer on the encapsulation layer, wherein the third inorganic film layer is configured as a lens corresponding to each sub-pixel one by one;

[0032] The Bragg filter layer is formed on the third inorganic film layer, and the refractive index of the third inorganic film layer is greater than the refractive index of the first inorganic film layer which is the innermost layer of the Bragg filter layer close to the encapsulation layer.

[0033] The beneficial effects of the present invention are as follows:

[0034] In view of the existing problems, the present invention develops a display substrate, a display panel and a manufacturing method, which forms a distributed Bragg reflector capable of transmitting light of different colors by including a plurality of first inorganic film layers and second inorganic film layers with different refractive indices stacked and alternately arranged, thereby forming a color filter layer using only inorganic materials. This can make up for the reliability problem caused by the use of inorganic film layers interspersed with organic film layers in the color filter layer in the prior art, and effectively improve the reliability of the product during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic structural diagram of a display substrate according to an embodiment of the present invention is shown;

[0037] Figure 2 A schematic structural diagram of a display substrate according to another embodiment of the present invention is shown;

[0038] Figure 3 A schematic structural diagram of a display substrate according to another embodiment of the present invention is shown;

[0039] Figure 4 A flow chart showing a manufacturing method according to an embodiment of the present invention;

[0040] Figure 5 A schematic structural diagram of a display substrate in the related art is shown. DETAILED DESCRIPTION

[0041] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0042] It should be noted that the terms “on…”, “formed on…” and “disposed on…” described herein may indicate that one layer is directly formed or disposed on another layer, or may indicate that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers. In this article, unless otherwise specified, the term “located on the same layer” used means that two layers, parts, components, elements or parts can be formed by the same patterning process, and the two layers, parts, components, elements or parts are generally formed of the same material. In this article, unless otherwise specified, the expression “patterning process” generally includes steps such as coating, exposure, development, etching and stripping of photoresist. The expression “one-time patterning process” means a process of forming patterned layers, parts, components, etc. using a mask.

[0043] In the related art, when the OLED display substrate adopts a white light emitting unit, the display color is realized by using a white light emitting unit + a color film layer. The encapsulation layer of the traditional white light emitting unit is usually encapsulated by an inorganic film layer, and the color filter of the color film layer is usually an organic polymer material, and the lens is formed by an inorganic material, such as Figure 5 As shown, the OLED display substrate includes a substrate 200, a driving circuit layer 210 arranged on the substrate 200, a light-emitting device layer 220 arranged on the driving circuit layer 210, including an anode 221, a light-emitting material layer arranged on the anode 221 and a cathode 222, forming a plurality of pixel units 230, each pixel unit 230 including a plurality of sub-pixels 231, an encapsulation layer 240 arranged on the light-emitting device layer 220, a color film layer 250 arranged on the encapsulation layer 240, including color filters 251 / 252 / 253 and a dielectric layer 254, a lens layer 260 arranged on the color film layer 250, including lenses 261 / 262 / 263 and a planarization layer 264, and a cover plate 270 arranged on the lens layer 260. Among them, the outermost layer of the encapsulation layer 240 is an inorganic film layer, the color filter and the dielectric layer included in the color film layer are organic film layers, and the lens is an inorganic film layer, so there is a structure in which the organic film layer is sandwiched between the inorganic film layers. This structure is prone to the problem that during the use of the OLED device, the volatilization of organic materials is sealed by the inorganic film layer and cannot be released, resulting in display reliability problems.

[0044] To solve the above problems, Figure 1 As shown, one embodiment of the present invention provides a display substrate, comprising:

[0045] Substrate 10;

[0046] A light emitting device layer 12 is provided on the substrate 10, wherein the light emitting device layer includes a plurality of pixel units 13 arranged in an array, each pixel unit includes a plurality of sub-pixels 131, and each sub-pixel 131 includes a light emitting unit;

[0047] An encapsulation layer 14 disposed on the light-emitting device layer 12, wherein the encapsulation layer 14 includes a plurality of encapsulation sublayers, and the outermost encapsulation sublayer away from the light-emitting device layer 12 is made of an inorganic material; and

[0048] The color filter layer 15 is disposed on the encapsulation layer 14;

[0049] The color filter layer 15 includes a distributed Bragg reflector corresponding to each sub-pixel 131 and used to transmit light of different colors. The distributed Bragg reflector includes Bragg filter layers 151, 152, and 153. The Bragg filter layer includes a plurality of first inorganic film layers and a plurality of second inorganic film layers stacked and alternately arranged on the encapsulation layer. The refractive index of the first inorganic film layer is less than the refractive index of the second inorganic film layer. In addition, the innermost layer of the Bragg filter layer close to the encapsulation layer 14 is the first inorganic film layer, and the outermost layer away from the encapsulation layer is the second inorganic film layer.

[0050] In this embodiment, a distributed Bragg reflector capable of transmitting light of different colors is formed by stacking and alternating a plurality of first inorganic film layers and second inorganic film layers having different refractive indices, thereby forming a color filter layer 15 using only inorganic materials, that is, the outermost encapsulation layer + color filter layer away from the substrate 10 are all made of inorganic materials, thereby avoiding the problem of inorganic film layers being mixed with organic film layers in the related art, resulting in the organic materials being sealed by the inorganic film layers due to volatilization during use, and effectively improving the reliability of the display product during use.

[0051] Specifically, Figure 2As shown, the encapsulation layer 14 of the present embodiment includes a first inorganic encapsulation layer 141, an organic encapsulation layer 142, and a second inorganic encapsulation layer 143 which are sequentially stacked on the light-emitting device layer 12, and the Bragg filter layer corresponding to each distributed Bragg reflector of different sub-pixels 131 includes a first inorganic film layer and a second inorganic film layer which are stacked and alternately arranged. For example: the Bragg filter layer 151 includes a first inorganic film layer 1511 and a second inorganic film layer 1512 which are stacked and alternately arranged, and the refractive index of the first inorganic film layer 1511 is less than the refractive index of the second inorganic film layer 1512, the innermost inorganic film layer of the Bragg filter layer 151 is the first inorganic film layer 1511, that is, the first inorganic film layer 1511 is directly arranged on the second inorganic encapsulation layer 143, the outermost inorganic film layer of the Bragg filter layer 151 is the second inorganic film layer 1512, and the planarization layer 158 Directly disposed on the second inorganic film layer 1512; that is, the Bragg filter layer 151 includes an even number of inorganic film layers, that is, includes a first inorganic film layer 1511 and a second inorganic film layer 1512 disposed in pairs, that is, the Bragg filter layer is formed by stacking and alternating the first inorganic film layer 1511 and the second inorganic film layer 1512 with different refractive indices, that is, the inorganic film layers with different refractive indices are periodically and alternately stacked to transmit light of a specific wavelength, for example, the Bragg filter layer 151 is a red filter layer for transmitting red light. Similarly, the Bragg filter layer 152 includes a first inorganic film layer 1521 and a second inorganic film layer 1522 stacked and alternately disposed, and a green filter layer for transmitting green light, and the Bragg filter layer 153 includes a first inorganic film layer 1531 and a second inorganic film layer 1532 stacked and alternately disposed, and a blue filter layer for transmitting blue light.

[0052] In this embodiment, on the one hand, a color filter layer formed by a first inorganic film layer and a second inorganic film layer having different refractive indices is used to filter out colored light from white light, and on the other hand, a pure inorganic film layer of an inorganic encapsulation layer + an inorganic color filter layer is realized, thereby ensuring that the color filter layer forms colored light while improving the reliability of the display product during use, which has practical application value.

[0053] In an optional embodiment, if Figure 3 As shown, the distributed Bragg reflector further includes a third inorganic film layer disposed between the encapsulation layer 14 and the Bragg filter layers 151, 152, 153.

[0054] The third inorganic film layer is configured as a lens 154 corresponding to each sub-pixel 131 , and is used to gather the emitted light of the light-emitting device layer 12 , and the refractive index of the third inorganic film layer is greater than the refractive index of the first inorganic film layer of the innermost layer of the Bragg filter layer close to the encapsulation layer.

[0055] In this embodiment, in order to improve the brightness gain of the display substrate, a third inorganic film layer is formed on the light-emitting side of the display substrate and on the side of the distributed Bragg reflector close to the encapsulation layer, and a hemispherical lens 154 is prepared by patterning the third inorganic film layer, and the brightness gain is improved by utilizing the principle of convex lens focusing. Meanwhile, considering that the refractive index of the second inorganic film layer is greater than that of the first inorganic film layer, a third inorganic film layer having a refractive index greater than that of the first inorganic film layer is arranged on the side of the first inorganic film layer close to the encapsulation layer in the distributed Bragg reflector, for example, the refractive index of the third inorganic film layer is equal to that of the second inorganic film layer, and further, inorganic film layers with different refractive indices are periodically and alternately stacked to be able to transmit light of a specific wavelength, thereby forming a distributed Bragg reflector of high refractive index - low refractive index - high refractive index... - low refractive index - high refractive index. At the same time, compared with the lens formed by organic materials in the related art, the lens in this embodiment is formed by an inorganic film layer, and the lens is further arranged between the inorganic packaging layer and the Bragg filter layer, further forming a full inorganic structure of inorganic packaging layer-inorganic lens-inorganic Bragg filter layer, thereby avoiding the problem of organic film layers being mixed in inorganic film layers in the related art, resulting in the volatilization of organic materials during use and being sealed by the inorganic film layers, effectively improving the reliability of the display product during use.

[0056] In this embodiment, the lens can be hemispherical or a part of a hemispherical or spherical shape. During the production process, it can be formed by transfer. For example, a whole third inorganic film layer is formed on the encapsulation layer, and a photosensitive material layer is formed on the third inorganic film layer. The photosensitive material layer is exposed and developed to form a pattern of multiple photosensitive material layers. The pattern of the photosensitive material layer is cubical. The cubical pattern of the photosensitive material layer is thermally baked to form a lens morphology, and then transferred to the third inorganic film layer using transfer technology to form lens 154.

[0057] It is worth noting that in this embodiment, the lens 154 corresponding to each sub-pixel is formed by a third inorganic film layer of the same inorganic material, and the Bragg filter layer corresponding to each sub-pixel is a color filter layer formed to transmit light of different color wavelengths.

[0058] The present application does not make any specific limitation on the distributed Bragg reflectors corresponding to each sub-pixel. Those skilled in the art should set the refractive indices of the first inorganic film layer, the second inorganic film layer and the third inorganic film layer according to the wavelengths of light of different color wavelengths transmitted according to actual application requirements, so as to achieve the color filtering function as the design criterion, which will not be repeated here.

[0059] In order to match the shape of the lens, in an optional embodiment, the lenses corresponding to the sub-pixels have the same morphology, the Bragg filter layer surrounds the lens, and is attached to a surface of the lens away from the encapsulation layer according to the morphology of the lens.

[0060] In this embodiment, the Bragg filter layers corresponding to different sub-pixels are attached to the corresponding lenses, such as Figure 3 As shown, the Bragg filter layer 151 is attached to the lens 154 according to the morphology thereof, that is, the surface of the Bragg filter layer 151 on the side of the first inorganic film layer close to the encapsulation layer close to the encapsulation layer is attached to the surface of the lens 154 close to the first inorganic film layer. In this embodiment, a lens formed by a third inorganic film layer is arranged in the distributed Bragg reflector to realize the full inorganic film layer setting of the distributed Bragg reflector, and through the stacking setting of the two with matching shapes, it is not necessary to set other dielectric film layers between the lens 154 and the Bragg filter layer 151, and there is no situation in which the organic material volatilizes and is sealed due to the inclusion of organic material in the inorganic material film layer during the use of the display product, which can effectively simplify the structure of the display product and reduce the production cost.

[0061] In order to improve the light extraction efficiency of the display substrate, in an optional embodiment, the orthographic projection of the Bragg filter layer on the substrate covers the orthographic projection of the corresponding light emitting unit on the substrate.

[0062] In this embodiment, if Figure 3 As shown, the orthographic projections of the Bragg filter layers corresponding to different sub-pixels on the substrate respectively cover the orthographic projections of their corresponding sub-pixels on the substrate, that is, the orthographic projection of the Bragg filter layer 151 on the substrate covers the orthographic projection of the anode 121 of its corresponding sub-pixel on the substrate, 122 is a light-emitting material layer and a cathode arranged on the anode, and the sub-pixel 131 defines a light-emitting area with the anode 121; that is, the Bragg filter layer 151 covers the anode 121 of the corresponding sub-pixel 131, so that the light emitted by the sub-pixel is filtered by the Bragg filter layer as much as possible, thereby effectively enhancing the light output efficiency of the display product.

[0063] In order to further improve the light extraction efficiency of the display substrate, in an optional embodiment, the orthographic projection of the lens on the substrate covers the orthographic projection of the corresponding light emitting unit on the substrate.

[0064] Based on the above embodiments, Figure 3 As shown, this embodiment further limits the orthographic projection of the lens 154 formed by the third inorganic film layer of the distributed Bragg reflector corresponding to different sub-pixels on the substrate to cover the orthographic projection of the corresponding sub-pixel on the substrate, so that the light emitted by the sub-pixel is further converged by the lens 154, and after converging more light, it is filtered through the Bragg filter layer, thereby effectively improving the light output efficiency of the display product.

[0065] In an optional embodiment, the color filter layer includes a first distributed Bragg reflector for transmitting the first color light, a second distributed Bragg reflector for transmitting the second color light, and a third distributed Bragg reflector for transmitting the third color light;

[0066] The number of inorganic film layers included in the Bragg filter layers of the first distributed Bragg reflector, the second distributed Bragg reflector and the third distributed Bragg reflector is the same or different.

[0067] In this embodiment, for each distributed Bragg reflector of the color filter layer corresponding to light of different color wavelengths, the number of inorganic film layers included in different distributed Bragg reflectors is related to the light of a specific color wavelength transmitted, and the first inorganic film layer and the second inorganic film layer used. For example, in the simulation process, the inorganic film layers of the Bragg filter layer of each distributed Bragg reflector can be defined as a fixed number of layers, such as 14 layers, and then designed according to the light of the color wavelength to be transmitted, and the refractive index of the first inorganic film layer and the refractive index of the second inorganic film layer used; for another example, the number of inorganic film layers of the Bragg filter layer is not limited, for example, the number of inorganic film layers of the Bragg filter layer corresponding to red light is 12 layers, the number of inorganic film layers of the Bragg filter layer corresponding to green light is 14 layers, and the number of inorganic film layers of the Bragg filter layer corresponding to blue light is 16 layers. This embodiment does not specifically limit the number of inorganic film layers included in the Bragg filter layer. Those skilled in the art should select an appropriate number of inorganic film layers according to actual application requirements, with the light transmission function as the design criterion, which will not be repeated here.

[0068] In an optional embodiment, the inorganic film layers included in the Bragg filter layers of the first distributed Bragg reflector, the second distributed Bragg reflector and the third distributed Bragg reflector have the same or different film thicknesses.

[0069] In this embodiment, considering the wavelengths of light of different colors and the refractive indices of the first inorganic film layer and the second inorganic film layer used, the thicknesses of the Bragg filter layers formed by the same or different numbers of inorganic film layers may be the same or different.

[0070] Specifically, the film thickness of each inorganic film layer in the Bragg filter layer is:

[0071]

[0072] Wherein, λ is the wavelength of the color light transmitted by the Bragg filter layer to which the inorganic film layer belongs, and n is the refractive index of the inorganic film layer.

[0073] In this embodiment, the thickness of each first inorganic film layer and the second inorganic film layer of light of different color wavelengths can be obtained according to the above formula, thereby obtaining the thickness of each Bragg filter layer corresponding to the light of different color wavelengths, that is, according to the wavelength of the specific color light that each distributed Bragg reflector needs to transmit, the refractive indices of the first inorganic film layer, the second inorganic film layer and the third inorganic film layer are combined to form the same lens corresponding to each distributed Bragg reflector, and different Bragg filter layers, that is, to form each Bragg filter layer of the same thickness or different thickness, that is, to form each distributed Bragg reflector of similar thickness or different thickness.

[0074] In an optional embodiment, the display substrate further includes a planarization layer covering the color filter layer, and the refractive index of the planarization layer is smaller than the refractive index of the outermost second inorganic film layer of the Bragg filter layer away from the encapsulation layer.

[0075] In this embodiment, if Figure 3 As shown, a planarization layer 158 covering the distributed Bragg reflector is formed, and the planarization layer is, for example, UV glue, and the refractive index of the UV glue is less than the refractive index of the second inorganic film layer. In this embodiment, by setting the refractive index of the planarization layer to be less than the refractive index of the second inorganic film layer, the angle of the emitted light can be increased, thereby improving the light extraction efficiency of the display product.

[0076] In order to further improve the display effect of the display substrate, in an optional embodiment, the color filter layer further includes an auxiliary filter layer located between two adjacent distributed Bragg reflectors.

[0077] The auxiliary filter layer includes at least two Bragg filter layers of the distributed Bragg reflector.

[0078] In this embodiment, considering that there may be light leakage between each sub-pixel, and thus a crosstalk phenomenon is formed at the boundary position of each sub-pixel, this embodiment forms an auxiliary filter layer between two adjacent distributed Bragg reflectors based on the manufacturing process of the Bragg filter layer, including a Bragg filter layer corresponding to light of different color wavelengths, so that the light leakage and crosstalk phenomenon caused by the light between each sub-pixel is avoided by the filtering characteristics of at least two Bragg filter layers. In other words, by using the filtering performance of the Bragg filter layer of the distributed Bragg reflector corresponding to each sub-pixel for light of different color wavelengths, a light blocking layer is formed between two adjacent distributed Bragg reflectors. For example, the light passing through the first Bragg filter layer of the auxiliary filter layer has a wavelength matching the filter layer, and the wavelength of the light does not match the filtering wavelength of the second Bragg filter layer arranged on the first Bragg filter layer, so that the light is blocked by the auxiliary filter layer arranged between the two adjacent distributed Bragg reflectors, effectively preventing light leakage and crosstalk.

[0079] At the same time, the auxiliary filter layer includes a Bragg filter layer that forms a distributed Bragg reflector corresponding to each sub-pixel, so that the auxiliary filter layer is formed by using an existing process, which effectively simplifies the process; compared with the light-blocking layer solution formed by a black matrix in the related art, firstly, the black matrix is ​​an organic material. In the present embodiment, an inorganic material is used to form a lens, and an inorganic material is used to form a Bragg filter layer. When the black matrix is ​​used as a light-blocking layer between two adjacent sub-pixels, there is a situation where organic matter is mixed in the inorganic material, which affects the reliability of the display substrate; secondly, from the perspective of the manufacturing process, Secondly, considering that the light-blocking layer formed by the black matrix through the exposure and development process is inferior to the auxiliary filter layer of the present embodiment in terms of morphology, there is a certain risk of light leakage; secondly, considering that the light-blocking performance of the black matrix is ​​related to its thickness, the light-blocking layer formed by the black matrix is ​​thicker than the auxiliary filter layer of the present embodiment, which is not conducive to the thin and light performance of the display product; finally, compared with using organic matter to form a color filter layer and using a black matrix to form a light-blocking layer, which is prone to the problem of mutual solubility of the two materials during the manufacturing process, the all-inorganic film layer setting of the distributed Bragg reflector adopted in the present embodiment does not have the risk of color filter layer filtering performance.

[0080] In an optional embodiment, the color filter layer includes a first distributed Bragg reflector for transmitting the first color light, a second distributed Bragg reflector for transmitting the second color light, and a third distributed Bragg reflector for transmitting the third color light;

[0081] The auxiliary filter layer includes a Bragg filter layer of a first distributed Bragg reflector, a Bragg filter layer of a second distributed Bragg reflector, and a Bragg filter layer of a third distributed Bragg reflector, which are stacked on the packaging layer.

[0082] In this embodiment, if Figure 3 As shown, the space between each sub-pixel 131 is used to form an auxiliary filter layer 159 for preventing light leakage and crosstalk, including a first auxiliary filter layer 155 of the Bragg filter layer 151 corresponding to the leftmost sub-pixel in the figure, a second auxiliary filter layer 156 of the Bragg filter layer 152 corresponding to the middle sub-pixel in the figure, and a third auxiliary filter layer 157 of the Bragg filter layer 153 corresponding to the rightmost sub-pixel in the figure. The auxiliary filter layer 159 includes a plurality of auxiliary filter layers that can transmit light of different color wavelengths, effectively filtering out the lateral light of each sub-pixel, thereby avoiding light leakage of each sub-pixel, further avoiding crosstalk at the boundary position of each sub-pixel, and while improving the brightness gain of the display product through the distributed Bragg reflectors for different sub-pixels, further improving the display effect of the display product, improving the reliability of the display product, simplifying the process and reducing the cost.

[0083] To further illustrate the specific structure of this embodiment, the manufacturing of the display substrate of this embodiment is taken as an example. Figure 4 As shown, the following steps are included:

[0084] In the first step, a light emitting device layer is formed on a substrate.

[0085] In this embodiment, if Figure 1 and Figure 2 As shown, a driving circuit layer 11 is formed on a substrate, and a light-emitting device layer 12 is formed on the driving circuit layer, wherein the light-emitting device layer 12 includes a plurality of pixel units 13 arranged in an array, each pixel unit 13 includes a plurality of sub-pixels 131, and each sub-pixel includes a light-emitting unit; specifically, the light-emitting device layer 12 includes an anode 121 disposed on the driving circuit layer 11, a light-emitting material layer disposed on the anode 121, and a cathode 122. The light-emitting material of each sub-pixel 131 emits white light in response to the voltage applied to the anode 121.

[0086] The second step is to form a packaging layer on the light emitting device layer.

[0087] In this embodiment, if Figure 2 As shown, the encapsulation layer includes a plurality of encapsulation sub-layers, for example, a first inorganic encapsulation layer 141 , an organic encapsulation layer 142 and a second inorganic encapsulation layer 143 , to prevent water and oxygen from corroding the light-emitting material layer of the light-emitting device layer 12 .

[0088] The third step is to form a color filter layer on the encapsulation layer.

[0089] In this embodiment, if Figure 3 As shown, the color filter layer includes a distributed Bragg reflector corresponding to each sub-pixel one by one and used to transmit light of different colors, the distributed Bragg reflector includes a third inorganic film layer and a Bragg filter layer, the Bragg filter layer includes a plurality of first inorganic film layers and a plurality of second inorganic film layers stacked and alternately arranged on the encapsulation layer, the refractive index of the first inorganic film layer is less than the refractive index of the second inorganic film layer, and the innermost layer of the Bragg filter layer close to the encapsulation layer is the first inorganic film layer, and the outermost layer away from the encapsulation layer is the second inorganic film layer.

[0090] First, a third inorganic film layer is formed on the second inorganic encapsulation layer, for example, a lens is formed by transfer technology to converge the light emitted by each sub-pixel. In this embodiment, the lenses corresponding to each sub-pixel are the same. This application does not make specific limitations on this. Those skilled in the art should select appropriate lenses according to actual application requirements, which will not be elaborated here.

[0091] Secondly, a Bragg filter layer covering the lens is formed, for example, different Bragg filter layers are formed for light of different color wavelengths, the Bragg filter layer includes a plurality of first inorganic film layers and a plurality of second inorganic film layers stacked and alternately arranged on the packaging layer, the refractive index of the first inorganic film layer is less than the refractive index of the second inorganic film layer, and the innermost layer of the Bragg filter layer close to the packaging layer is the first inorganic film layer, and the outermost layer away from the packaging layer is the second inorganic film layer. In this embodiment, the number of inorganic film layers included in each Bragg filter layer is the same or different, and the film thickness of the inorganic film layers included in each Bragg filter layer is the same or different.

[0092] In this embodiment, the refractive index of the third inorganic film layer is greater than the refractive index of the first inorganic film layer, for example, equal to the refractive index of the second inorganic film layer, and the distributed Bragg reflector includes a stacked third inorganic film layer, an alternately arranged first inorganic film layer and a second inorganic film layer, that is, inorganic film layers with different refractive indices are periodically and alternately stacked to transmit light of a specific wavelength, thereby forming a distributed Bragg reflector of high refractive index-low refractive index-high refractive index...-low refractive index-high refractive index. At the same time, considering the light extraction efficiency of the display substrate, the orthographic projection of the Bragg filter layer on the substrate is set to cover the orthographic projection of the corresponding light-emitting unit on the substrate, so that the light emitted by the sub-pixel is filtered as much as possible by the Bragg filter layer, effectively enhancing the light extraction efficiency of the display product. Further, the orthographic projection of the lens on the substrate is set to cover the orthographic projection of the corresponding light-emitting unit on the substrate, and the light emitted by the sub-pixel is further converged by the lens, and after converging more light, it is filtered by the Bragg filter layer, thereby effectively improving the light extraction efficiency of the display product.

[0093] Furthermore, considering that the lens is hemispherical, in this embodiment, the Bragg filter layers corresponding to different sub-pixels are attached to the corresponding lenses, that is, the surface of the first inorganic film layer of the Bragg filter layer close to the second inorganic encapsulation layer is attached to the surface of the lens close to the first inorganic film layer. In this embodiment, a lens formed by a third inorganic film layer is arranged in the distributed Bragg reflector to achieve a full inorganic film layer setting of the distributed Bragg reflector, and by the stacking setting of the two with matching shapes, there is no need to set other dielectric film layers between the lens and the Bragg filter layer, and there is no situation in which the organic material volatilization is sealed due to the inclusion of organic materials in the inorganic material film layer during the use of the display product, which can effectively simplify the structure of the display product and reduce the production cost.

[0094] At the same time, in the process of manufacturing the distributed Bragg reflector, the manufacturing steps of the Bragg filter layer are used to form an auxiliary filter layer between two adjacent distributed Bragg reflectors, and the auxiliary filter layer includes a Bragg filter layer of a first distributed Bragg reflector, a Bragg filter layer of a second distributed Bragg reflector, and a Bragg filter layer of a third distributed Bragg reflector stacked on the packaging layer; that is, the space between the distributed Bragg reflectors corresponding to each sub-pixel is used to form an auxiliary filter layer for preventing light leakage and crosstalk, and while the brightness gain of the display product is improved by the distributed Bragg reflectors for different sub-pixels, the display effect of the display product is further improved.

[0095] In an optional embodiment, considering that the second inorganic encapsulation layer is an inorganic material, the second inorganic encapsulation layer and the lens are formed by one manufacturing step, for example, a third inorganic material layer is formed, and the second inorganic encapsulation layer and the lens are formed by transfer technology, thereby further reducing the manufacturing steps and reducing the manufacturing cost.

[0096] The fourth step is to form a planarization layer covering the color filter layer.

[0097] In this embodiment, based on the formed distributed Bragg reflector covering the flattening layer, the light-emitting side of the display product is ensured to be flat, and the refractive index of the flattening layer is smaller than the refractive index of the second inorganic film layer of the outermost layer of the Bragg filter layer away from the encapsulation layer, which can increase the angle of the emitted light and improve the light-emitting efficiency of the display product.

[0098] Finally, if Figure 1-3 As shown, the cover plate 16 is formed on the planarization layer 158 .

[0099] The display substrate of the present embodiment is thus formed. The present embodiment forms a distributed Bragg reflector capable of transmitting light of different colors by including a plurality of first inorganic film layers and second inorganic film layers having different refractive indices that are stacked and alternately arranged, thereby forming a color filter layer using only inorganic materials. This can make up for the reliability problem caused by the use of inorganic film layers interspersed with organic film layers in the color filter layer in the prior art, and effectively improve the reliability of the product during use.

[0100] Corresponding to the display substrate provided in the above embodiment, an embodiment of the present application further provides a method for manufacturing the above display substrate, such as Figure 4 As shown, including:

[0101] forming a light-emitting device layer on a substrate, wherein the light-emitting device layer comprises a plurality of pixel units arranged in an array, each pixel unit comprises a plurality of sub-pixels, and each sub-pixel comprises a light-emitting unit;

[0102] forming an encapsulation layer on the light-emitting device layer, wherein the encapsulation layer comprises a plurality of encapsulation sublayers, and the outermost encapsulation sublayer away from the light-emitting device layer is an inorganic material;

[0103] A color filter layer is formed on the encapsulation layer, the color filter layer includes a distributed Bragg reflector corresponding to each sub-pixel one by one and used to transmit light of different colors, the distributed Bragg reflector includes a Bragg filter layer, the Bragg filter layer includes a plurality of first inorganic film layers and a plurality of second inorganic film layers stacked and alternately arranged on the encapsulation layer, the refractive index of the first inorganic film layer is less than the refractive index of the second inorganic film layer, and the innermost layer of the Bragg filter layer close to the encapsulation layer is the first inorganic film layer, and the outermost layer away from the encapsulation layer is the second inorganic film layer.

[0104] This embodiment forms a distributed Bragg reflector capable of transmitting light of different colors by including a plurality of first inorganic film layers and a second inorganic film layers with different refractive indices that are stacked and alternately arranged, thereby forming a color filter layer using only inorganic materials. This can make up for the reliability problem caused by the use of inorganic film layers interspersed with organic film layers in the color filter layer in the prior art, and effectively improve the reliability of the product during use.

[0105] In an optional embodiment, forming a color filter layer on the encapsulation layer further comprises:

[0106] forming a third inorganic film layer on the encapsulation layer, wherein the third inorganic film layer is configured as a lens corresponding to each sub-pixel one by one;

[0107] The Bragg filter layer is formed on the third inorganic film layer, and the refractive index of the third inorganic film layer is greater than the refractive index of the first inorganic film layer which is the innermost layer of the Bragg filter layer close to the encapsulation layer.

[0108] In the present embodiment, a third inorganic film layer with a refractive index greater than that of the first inorganic film layer is arranged on the side of the first inorganic film layer closest to the encapsulation layer in the distributed Bragg reflector, and the lens formed by the third inorganic film layer is matched with the stacked and alternating first inorganic film layers and second inorganic film layers in the Bragg filter layer. The inorganic film layers with different refractive indices are periodically and alternately stacked to transmit light of a specific wavelength, thereby forming a distributed Bragg reflector with a high refractive index - a low refractive index - a high refractive index... - a low refractive index - a high refractive index.

[0109] Based on the above-mentioned display substrate, an embodiment of the present application also provides a display panel, including the above-mentioned display substrate, wherein the display panel can be any product or component with display function such as a smart phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc., and this embodiment does not limit this.

[0110] In view of the existing problems, the present invention develops a display substrate, a display panel and a manufacturing method, which forms a distributed Bragg reflector capable of transmitting light of different colors by including a plurality of first inorganic film layers and second inorganic film layers with different refractive indices stacked and alternately arranged, thereby forming a color filter layer using only inorganic materials. This can make up for the reliability problem caused by the use of inorganic film layers interspersed with organic film layers in the color filter layer in the prior art, and effectively improve the reliability of the product during use.

[0111] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A display substrate, characterized in that: include: substrate; A light-emitting device layer is provided on the substrate, wherein the light-emitting device layer includes a plurality of pixel units arranged in an array, each pixel unit includes a plurality of sub-pixels, and each sub-pixel includes a light-emitting unit; An encapsulation layer disposed on the light-emitting device layer, the encapsulation layer comprising a plurality of encapsulation sublayers, wherein the outermost encapsulation sublayer away from the light-emitting device layer is made of an inorganic material; and A color filter layer disposed on the encapsulation layer; in The color filter layer includes a distributed Bragg reflector corresponding to each sub-pixel one by one and used to transmit light of different colors. The distributed Bragg reflector includes a Bragg filter layer. The Bragg filter layer includes a plurality of first inorganic film layers and a plurality of second inorganic film layers stacked and alternately arranged on the encapsulation layer. The refractive index of the first inorganic film layer is less than the refractive index of the second inorganic film layer. In addition, the innermost layer of the Bragg filter layer close to the encapsulation layer is the first inorganic film layer, and the outermost layer away from the encapsulation layer is the second inorganic film layer.

2. The display substrate according to claim 1, characterized in that: The distributed Bragg reflector further includes a third inorganic film layer disposed between the encapsulation layer and the Bragg filter layer. The third inorganic film layer is configured as a lens corresponding to each sub-pixel one by one, for gathering the emitted light of the light-emitting device layer, and the refractive index of the third inorganic film layer is greater than the refractive index of the first inorganic film layer of the innermost layer of the Bragg filter layer close to the encapsulation layer.

3. The display substrate according to claim 2, characterized in that: The lenses corresponding to the sub-pixels have the same morphology. The Bragg filter layer surrounds the lenses and is attached to a surface of the lens on one side away from the encapsulation layer according to the morphology of the lenses.

4. The display substrate according to claim 3, characterized in that: The orthographic projection of the Bragg filter layer on the substrate covers the orthographic projection of the corresponding light emitting unit on the substrate.

5. The display substrate according to claim 4, characterized in that: The orthographic projection of the lens on the substrate covers the orthographic projection of the corresponding light emitting unit on the substrate.

6. The display substrate according to claim 2, characterized in that: The color filter layer includes a first distributed Bragg reflector for transmitting a first color light, a second distributed Bragg reflector for transmitting a second color light, and a third distributed Bragg reflector for transmitting a third color light; The number of inorganic film layers included in the Bragg filter layers of the first distributed Bragg reflector, the second distributed Bragg reflector and the third distributed Bragg reflector is the same or different.

7. The display substrate according to claim 6, characterized in that: The thickness of each inorganic film layer included in the Bragg filter layer of the first distributed Bragg reflector, the second distributed Bragg reflector and the third distributed Bragg reflector is the same or different.

8. The display substrate according to claim 7, characterized in that: The thickness of the inorganic film layer is: Wherein, λ is the wavelength of the color light transmitted by the Bragg filter layer to which the inorganic film layer belongs, and n is the refractive index of the inorganic film layer.

9. The display substrate according to claim 1, characterized in that: The color filter layer also includes an auxiliary filter layer located between two adjacent distributed Bragg reflectors. The auxiliary filter layer includes at least two Bragg filter layers of the distributed Bragg reflector.

10. The display substrate according to claim 9, characterized in that: The color filter layer includes a first distributed Bragg reflector for transmitting a first color light, a second distributed Bragg reflector for transmitting a second color light, and a third distributed Bragg reflector for transmitting a third color light; The auxiliary filter layer includes a Bragg filter layer of a first distributed Bragg reflector, a Bragg filter layer of a second distributed Bragg reflector, and a Bragg filter layer of a third distributed Bragg reflector, which are stacked on the packaging layer.

11. The display substrate according to any one of claims 1 to 10, characterized in that: The display substrate further includes a planarization layer covering the color filter layer, wherein the refractive index of the planarization layer is smaller than the refractive index of the outermost second inorganic film layer of the Bragg filter layer away from the encapsulation layer.

12. A display panel, characterized in that: The invention comprises a display substrate as claimed in any one of claims 1 to 11.

13. A method for manufacturing a display substrate as claimed in any one of claims 1 to 11, characterized in that: include: forming a light-emitting device layer on a substrate, wherein the light-emitting device layer comprises a plurality of pixel units arranged in an array, each pixel unit comprises a plurality of sub-pixels, and each sub-pixel comprises a light-emitting unit; forming an encapsulation layer on the light-emitting device layer, wherein the encapsulation layer comprises a plurality of encapsulation sublayers, and the outermost encapsulation sublayer away from the light-emitting device layer is an inorganic material; A color filter layer is formed on the encapsulation layer, the color filter layer includes a distributed Bragg reflector corresponding to each sub-pixel one by one and used to transmit light of different colors, the distributed Bragg reflector includes a Bragg filter layer, the Bragg filter layer includes a plurality of first inorganic film layers and a plurality of second inorganic film layers stacked and alternately arranged on the encapsulation layer, the refractive index of the first inorganic film layer is less than the refractive index of the second inorganic film layer, and the innermost layer of the Bragg filter layer close to the encapsulation layer is the first inorganic film layer, and the outermost layer away from the encapsulation layer is the second inorganic film layer.

14. The manufacturing method according to claim 13, characterized in that: The forming of a color filter layer on the encapsulation layer further comprises: forming a third inorganic film layer on the encapsulation layer, wherein the third inorganic film layer is configured as a lens corresponding to each sub-pixel one by one; The Bragg filter layer is formed on the third inorganic film layer, and the refractive index of the third inorganic film layer is greater than the refractive index of the first inorganic film layer which is the innermost layer of the Bragg filter layer close to the encapsulation layer.

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