CN115360314A - Display substrate, display device and manufacturing method - Google Patents
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- CN115360314A CN115360314A CN202211046337.7A CN202211046337A CN115360314A CN 115360314 A CN115360314 A CN 115360314A CN 202211046337 A CN202211046337 A CN 202211046337A CN 115360314 A CN115360314 A CN 115360314A
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Abstract
The invention discloses a display substrate, a display device and a manufacturing method, wherein the display substrate of one embodiment comprises a substrate, an organic light emitting layer, a first inorganic packaging layer, a color conversion layer and a second inorganic packaging layer, wherein the organic light emitting layer is formed on the substrate in a stacking mode and comprises a plurality of light emitting units arranged in an array mode; the color conversion layer is used for responding to the driving of the emergent light of the light emitting unit to form various colors of light so as to synthesize white light; the first inorganic packaging layer, the color conversion layer and the second inorganic packaging layer form a packaging layer of the organic light emitting layer. According to the display substrate provided by the embodiment of the invention, the color conversion layer is arranged in the packaging layer and is used as a part of the packaging layer, so that the color mixing problem of the display substrate in the related technology can be solved, the display effect can be improved, the user experience is improved, and the display substrate has a wide application prospect.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display substrate, a display device and a manufacturing method.
Background
With the improvement of science and technology, the social living standard is improved, and the requirement of consumers for display products is increasingly improved, and the production of high-resolution and high-image-quality displays is a definite development direction for display manufacturers. In the related art, a display device with high light extraction efficiency is generally formed by using a quantum dot technology and an organic light emitting technology together, but there are phenomena of color mixing and white light color shift yellowing.
How to solve the problems of color mixing and yellow shift of white light to improve the display effect of the display device is an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve at least one of the above problems, a first aspect of the present invention provides a display substrate including a substrate, an organic light emitting layer, a first inorganic encapsulating layer, a color conversion layer, and a second inorganic encapsulating layer, which are laminated on the substrate, wherein,
the organic light-emitting layer comprises a plurality of light-emitting units arranged in an array;
the color conversion layer is used for responding to the driving of the emergent light of the light emitting unit to form various colors of light so as to synthesize white light;
the first inorganic packaging layer, the color conversion layer and the second inorganic packaging layer form a packaging layer of the organic light emitting layer.
For example, in some embodiments of the present application, the first inorganic encapsulation layer includes at least one of SiNO and SiNx, and a thickness of the first inorganic encapsulation layer is 2 μm or more and 3 μm or less.
For example, some embodiments of the present disclosure provide a display substrate in which the color conversion layer includes a pixel dam, and a filling material disposed in at least a portion of an opening defined by the pixel dam, wherein
In the direction vertical to the substrate, the thickness of the pixel dam is more than or equal to 3 μm and less than or equal to 20 μm;
at least a portion of the filler material comprises a quantum dot material.
For example, some embodiments of the present disclosure provide a display substrate, wherein the display substrate includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the display substrate further includes a light extraction layer disposed on the second inorganic encapsulation layer and disposed on the red sub-pixel and the green sub-pixel, including:
a lens layer arranged on the second inorganic packaging layer at intervals, wherein the orthographic projection of the lens layer on the substrate covers the orthographic projection of the intervals of the adjacent red sub-pixels and green sub-pixels on the substrate; and
the first medium layer at least partially covers the lens layer, the refractive index of the first medium layer is larger than that of the lens layer, the orthographic projection of the first medium layer on the substrate covers the orthographic projection of the red sub-pixel on the substrate, and the orthographic projection of the first medium layer on the substrate covers the orthographic projection of the green sub-pixel on the substrate.
In some embodiments of the present application, for example, a display substrate is provided in which, in a direction perpendicular to the substrate,
the thickness of the lens layer is more than or equal to 1.5 mu m and less than or equal to 3 mu m, and the refractive index of the lens layer is more than or equal to 1.3 and less than or equal to 1.5;
the thickness of the first medium layer is more than or equal to 3 mu m and less than or equal to 6 mu m, and the refractive index of the first medium layer is more than or equal to 1.7 and less than or equal to 1.9.
For example, some embodiments of the present disclosure provide a display substrate, wherein an orthographic projection of the first dielectric layer on the substrate coincides with the substrate.
For example, some embodiments of the present application provide a display substrate, wherein an orthographic projection of the first medium layer on the substrate partially overlaps with an orthographic projection of the lens layer on the substrate, and an opening of the first medium layer is larger than an opening of the lens layer.
For example, some embodiments of the present application provide a display substrate, further comprising a color resist layer disposed on the second inorganic encapsulation layer,
the color resistance layer is arranged on one side of the light extraction layer close to the substrate or one side of the light extraction layer far away from the substrate;
the color resistance layer comprises a black matrix and color resistance materials arranged in partial openings defined by the black matrix, the color resistance materials comprise red color resistance materials corresponding to the red sub-pixels and green color resistance materials corresponding to the green sub-pixels, and the openings of the black matrix corresponding to the blue sub-pixels are larger than and correspond to the openings of the black matrix of the red sub-pixels and the green sub-pixels.
For example, in some embodiments of the present disclosure, the black matrix openings corresponding to the red and green sub-pixels are smaller than or equal to the openings of the lens layer.
For example, in some embodiments of the present disclosure, the color conversion layer includes a pixel dam and a filling material disposed in at least a portion of an opening defined by the pixel dam, a black matrix opening corresponding to the red sub-pixel and the green sub-pixel is equal to or smaller than an opening of the lens layer, an opening of the lens layer is equal to or larger than an opening of the pixel dam, and an opening of the pixel dam corresponding to the blue sub-pixel is filled with a blue color resist.
For example, some embodiments of the present application provide a display substrate, further comprising a color resist layer disposed on the second inorganic encapsulation layer,
the color resistance layer comprises a black matrix, a color resistance material arranged in an opening defined by the black matrix, and a second medium layer covering the color resistance material and the black matrix,
the color-resisting material comprises a red color-resisting material corresponding to the red sub-pixel, a green color-resisting material corresponding to the green sub-pixel, and a blue color-resisting material corresponding to the blue sub-pixel, and the red color-resisting material and the green color-resisting material comprise a plurality of concave structures, the blue color-resisting material comprises a plurality of convex structures, and the black matrix opening corresponding to the red sub-pixel and the green sub-pixel is smaller than the black matrix opening corresponding to the blue sub-pixel;
the refractive index of the second medium layer is larger than that of the color resistance material, and the color resistance material and the second medium layer are multiplexed into a light extraction layer.
A second aspect of the invention provides a display device comprising a display substrate as described in the first aspect.
A third aspect of the present invention provides a method for manufacturing the display substrate of the first aspect, including:
an organic light emitting layer formed on the substrate and including a plurality of light emitting cells arranged in an array;
a first inorganic encapsulation layer formed on the organic light emitting layer;
a color conversion layer formed on the first inorganic encapsulation layer, forming each color light in response to driving of light emitted from the light emitting unit to synthesize white light;
and a second inorganic encapsulation layer formed on the color conversion layer, wherein the first inorganic encapsulation layer, the color conversion layer and the second inorganic encapsulation layer form an encapsulation layer of the organic light emitting layer.
The invention has the following beneficial effects:
aiming at the existing problems, the invention provides a display substrate, a display device and a manufacturing method, wherein a color conversion layer is arranged in a packaging layer and is used as a part of the packaging layer, and the distance between the color conversion layer and an organic light emitting layer is effectively shortened, so that the problem of light leakage caused by the fact that the peripheral color conversion layer emits light due to the large-angle light of an organic light emitting diode is effectively solved, and the problem of color cast of white light is effectively improved through the limited color conversion layer; particularly, the light extraction layer comprises the low-folding lens layer and the high-folding lens layer, so that the total reflection of red light and green light emitted from the color conversion layer is realized on the contact surface from the high-folding lens layer to the low-folding lens layer to reduce the large visual angle light of the red light and the green light, the large visual angle attenuation of the red light and the green light is accelerated, the color cast problem of white light is further improved, the color cast problem in the related technology can be made up, the display effect of the display device is effectively improved, the user experience is further improved, and the wide application prospect is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIGS. 1a-1b show schematic views of viewing angle-luminance decay for quantum dot-red light and organic light emitting diode blue light, quantum dot-green light and organic light emitting diode blue light;
FIG. 2 is a schematic structural diagram of a display substrate according to an embodiment of the invention;
FIG. 3 shows a flow chart of a method of fabrication according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a display substrate according to another embodiment of the invention;
FIGS. 5a-5b are schematic views showing the viewing angle-luminance decay of quantum dot-red light and blue light of an organic light emitting diode, quantum dot-green light and blue light of an organic light emitting diode according to one embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display substrate according to another embodiment of the present invention;
FIGS. 7a-7b are schematic views illustrating a structure of a display substrate according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display substrate according to another embodiment of the invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar components in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
It should be noted that "formed on" 8230, "" 8230 "", "formed on" 8230, "" formed on "8230," provided on "8230," may mean that one layer is directly formed or provided on the other layer, or that one layer is indirectly formed or provided on the other layer, that is, that another layer exists between the two layers. As used herein, unless otherwise specified, the term "on the same layer" means that two layers, components, members, elements or portions can be formed by the same patterning process, and the two layers, components, members, elements or portions are generally formed of the same material. Herein, unless otherwise specified, the expression "patterning process" generally includes the steps of coating of photoresist, exposure, development, etching, stripping of photoresist, and the like. The expression "one-time patterning process" means a process of forming a patterned layer, member, component, or the like using one mask.
For the problem of white light color shift existing in the related art, the inventor has proposed through a great deal of research and experiments that, due to the problem of the lifetime of the quantum dot-blue light of the quantum dot technology used by the color conversion layer, the color conversion layer includes the quantum dot-red light and the quantum dot-green light, the blue light of the display device is the blue light emitted by the organic light emitting technology, as shown in fig. 1a, the blue light is a view angle-brightness attenuation diagram of the quantum dot-red light and the blue light of the organic light emitting diode, wherein, an x axis represents a view angle from-90 degrees to 90 degrees, a y axis represents a brightness percentage, the brightness of a 0 view angle (namely, a positive view angle) is taken as a unit 1, the brightness of other view angles is represented by taking the brightness of the positive view angle as a reference, a dotted line curve is an attenuation curve of the quantum dot-red light, a solid line curve is an attenuation curve of the blue light of the organic light emitting diode, as can be known in the figure, and the attenuation speed of the blue light of the organic light emitting diode at a large view angle is far faster than that of the quantum dot-red light; similarly, as shown in fig. 1b, the schematic view angle-luminance attenuation of the quantum dot-green light and the blue light of the organic light emitting diode is shown, the dashed curve is the attenuation curve of the quantum dot-green light, and the solid curve is the attenuation curve of the blue light of the organic light emitting diode, as can be seen from the figure, the attenuation speed of the blue light of the organic light emitting diode at a large view angle is much faster than the attenuation speed of the quantum dot-green light. Meanwhile, as the white light of the display device is formed by mixing the lights of the three colors of red, green and blue, when the brightness and the tone of the three colors are inconsistent with the change of the visual angle, the synthesized white light has color cast. Meanwhile, as the quantum dot-red light and the quantum dot-green light of the color conversion layer are both excited by the blue light emitted by the organic light emitting layer, when only one of the quantum dot-red light and the quantum dot-green light emits light, the blue light with a large angle emitted by the organic light emitting layer can excite the adjacent quantum dot material to emit light, thereby causing a color mixing phenomenon.
In view of the above problems and the causes for the problems, as shown in fig. 2, an embodiment of the present invention provides a display substrate including a substrate 10, an organic light emitting layer 40, a first inorganic encapsulation layer 51, a color conversion layer 52, and a second inorganic encapsulation layer 53, which are stacked on the substrate 10, wherein,
the organic light emitting layer 40 includes a plurality of light emitting units arranged in an array;
the color conversion layer 52, responding to the drive of the light emitted from the light emitting unit, forming various colors of light to synthesize white light;
the first inorganic encapsulation layer 51, the color conversion layer 52, and the second inorganic encapsulation layer 53 form an encapsulation layer of the organic light emitting layer.
In this embodiment, the color conversion layer is a quantum dot layer, and the color conversion layer is disposed in the encapsulation layer and used as a part of the encapsulation layer to effectively reduce the distance between the quantum dot layer and the organic light emitting layer, thereby effectively solving the light leakage problem caused by the light emission of the peripheral color conversion layer due to the large-angle light of the organic light emitting diode, and effectively improving the color cast of the white light through the limited color conversion layer.
In a specific example, as shown in fig. 2 and 3, the display substrate of the present embodiment is manufactured as an example.
In a first step, an organic light emitting layer formed on a substrate includes a plurality of light emitting cells arranged in an array.
In this embodiment, a thin-film transistor layer 20, a planarization layer 30, and an organic light-emitting layer 40 are sequentially stacked and formed on a substrate 10, and the organic light-emitting layer 40 includes an anode 41 formed on the planarization layer 30, a pixel defining layer 42, an organic functional layer 43 disposed in an opening formed by the pixel defining layer 42, and a cathode 44 covered with the organic functional layer 43. The organic functional layer includes an organic material layer, and the organic material layer of the present embodiment emits blue light and excites the quantum dots of the color conversion layer to emit light by the emitted blue light. In order to further improve the light emitting efficiency of the organic material layer, the organic material layer may also be a plurality of stacked light emitting material layers, for example, a blue light emitting material layer formed by stacking three layers, a blue light-green light-blue light emitting material layer formed by stacking three layers, or a blue light-green light emitting material layer formed by stacking four layers can further improve the light emitting efficiency.
And a second step of forming a first inorganic encapsulation layer on the organic light emitting layer.
In this embodiment, the organic light emitting layer is encapsulated by the single-layer thickened first inorganic encapsulation layer, so as to prevent the organic light emitting layer from being corroded by water and oxygen. Specifically, the first inorganic encapsulation layer includes at least one of SiNO and SiNx, and a thickness of the first inorganic encapsulation layer is greater than or equal to 2 μm and less than or equal to 3 μm. The first inorganic encapsulation layer of the present embodiment further increases the encapsulation reliability by thickening, compared to the related art in which the thickness of the inorganic layer of the encapsulation layer is 1 μm.
And a third step of forming a color conversion layer on the first inorganic encapsulation layer to form each color light in response to driving of light emitted from the light emitting unit to synthesize white light.
In this embodiment, the color conversion layer is a quantum dot light emitting layer, and is excited by blue light emitted from the organic light emitting layer to form red light and green light, and forms white light together with the blue light emitted from the organic light emitting layer.
In an alternative embodiment, as shown in fig. 2, the color conversion layer 52 includes a pixel dam 521, and filling materials 522, 523, and 524 disposed in at least a portion of an opening defined by the pixel dam, wherein a thickness of the pixel dam 521 in a direction perpendicular to the substrate 10 is equal to or greater than 3 μm and equal to or less than 20 μm; at least a portion of the fill material comprises a quantum dot material.
In the present embodiment, the color conversion layer includes a filling material disposed in at least a portion of the opening defined by the pixel dam, such as filling materials corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel, wherein the filling material corresponding to the red sub-pixel is doped with red quantum dots, the filling material corresponding to the green sub-pixel is doped with green quantum dots, and the filling material corresponding to the blue sub-pixel is doped with a scattering material; or only the filling materials corresponding to the red and green sub-pixels, correspondingly doped with quantum dots of the corresponding colors.
In the embodiment, the pixel dam with the thickness of more than or equal to 3 μm and less than or equal to 20 μm, for example, the pixel dam with the thickness of 10 μm, is arranged, so that the conversion efficiency of quantum dots to red light and quantum dots to green light is effectively reduced, and the problem of white light color cast is improved.
And fourthly, forming a second inorganic packaging layer on the color conversion layer, wherein the first inorganic packaging layer, the color conversion layer and the second inorganic packaging layer form a packaging layer of the organic light-emitting layer.
In this embodiment, a second inorganic encapsulation layer is formed on a side of the color conversion layer away from the substrate, so that an encapsulation layer for protecting the organic light emitting layer is formed by the first inorganic encapsulation layer, the color conversion layer, and the second inorganic encapsulation layer, that is, the organic light emitting layer of this embodiment is multiplexed with the color conversion layer on the basis of the protection of the thickened first inorganic encapsulation layer, on the one hand, red light and green light are formed through the color conversion layer, on the other hand, the color conversion layer is used as an organic layer in the encapsulation layer to protect the organic light emitting layer, so that the distance between the quantum dot and the organic light emitting layer is shortened by using the color light leakage in the encapsulation layer, thereby effectively solving the problem of light leakage of the peripheral color conversion layer caused by the large-angle light of the organic light emitting diode, and effectively improving the color shift problem of white light through the limited color conversion layer.
Thus, the display substrate of the present embodiment is manufactured.
To further improve the white color shift problem, in an alternative embodiment, as shown in fig. 4, the display substrate includes a red sub-pixel 100, a green sub-pixel 200, and a blue sub-pixel 300, and the display substrate further includes a light extraction layer 60 disposed on the second inorganic encapsulation layer 53 and disposed on the red sub-pixel 100 and the green sub-pixel 200, including:
a lens layer 611 disposed on the second inorganic encapsulation layer 53 at an interval, wherein an orthographic projection of the lens layer 611 on the substrate 10 covers an orthographic projection of an interval of the adjacent red sub-pixel 100 and the green sub-pixel 200 on the substrate 10; and
a first medium layer 62 at least partially covering the lens layer, wherein the refractive index of the first medium layer 62 is greater than the refractive index of the lens layer 611, an orthographic projection of the first medium layer 62 on the substrate 10 covers an orthographic projection of the red sub-pixel 100 on the substrate 10, and an orthographic projection of the first medium layer 62 on the substrate 10 covers an orthographic projection of the green sub-pixel 200 on the substrate 10.
In a specific example, in a direction perpendicular to the substrate, the thickness of the lens layer 611 of the present embodiment is 1.5 μm or more and 3 μm or less, and the refractive index of the lens layer 611 is 1.3 or more and 1.5 or less; the thickness of the first dielectric layer 62 is greater than or equal to 3 μm and less than or equal to 6 μm, and the refractive index of the first dielectric layer 62 is greater than or equal to 1.7 and less than or equal to 1.9.
In this embodiment, the light extraction layer is disposed on the encapsulation layer, and the lens layer 611 with a low refractive index and the first dielectric layers 62 and 612 with a high refractive index in the light extraction layer are light transmission layers disposed on the same layer as the lens layer, so that the large-viewing-angle light emission of the quantum dot-red light and the quantum dot-green light is changed into the small-viewing-angle light emission, thereby accelerating the large-viewing-angle attenuation of the quantum dot-red light and the quantum dot-green light, and effectively improving the color shift. Specifically, as shown in fig. 4, as can be seen from a quantum dot-red light path 1001 emitted from the red subpixel 100, the large-viewing-angle light emitted from the quantum dot-red light enters the first medium layer 62 with a high refractive index and then enters the lens layer 611 with a low refractive index, and on a contact surface between the first medium layer 62 and the lens layer 611, the large-viewing-angle light emitted from the quantum dot-red light is totally reflected from the high refractive index to the low refractive index and the light emitting direction is changed to be emitted from the first medium layer 62; similarly, as can be known from the quantum dot-green light optical path 2001 emitted by the green sub-pixel 200, the quantum dot-green light large-viewing-angle light firstly enters the first medium layer 62 with a high refractive index and then enters the lens layer 611 with a low refractive index, and on the contact surface between the first medium layer 62 and the lens layer 611, the quantum dot-green light large-viewing-angle light is totally reflected from the high refractive index to the low refractive index and the light emitting direction is changed to be emitted from the first medium layer 62; therefore, the large-visual-angle light emission of the quantum dot-red light and the quantum dot-green light is converted into the small-visual-angle light emission or the normal-visual-angle light emission, namely, the large-visual-angle light emission is reduced, so that the large-visual-angle attenuation of the quantum dot-red light and the quantum dot-green light is accelerated, and the color cast is effectively improved.
As shown in fig. 5a, it is a schematic view of the quantum dot-red light and the blue light of the organic light emitting diode of the present embodiment of the present invention showing the viewing angle-luminance attenuation, wherein the x-axis represents the viewing angle, the y-axis represents the percentage of the luminance, the luminance at 0 viewing angle (i.e. positive viewing angle) is taken as unit 1, the luminances of other viewing angles are represented by taking the positive viewing angle luminance as the reference, the dashed curve is the attenuation curve of the quantum dot-red light, and the solid curve is the attenuation curve of the blue light of the organic light emitting diode, compared with fig. 1a, the attenuation speed of the quantum dot-red light at a large viewing angle is greatly increased, and the attenuation speed is faster than the attenuation speed of the quantum dot-red light; meanwhile, as shown in fig. 5b, a schematic view angle-luminance attenuation diagram of the quantum dot-green light and the blue light of the organic light emitting diode of the present embodiment is shown, where a dotted line curve is an attenuation curve of the quantum dot-green light, and a solid line curve is an attenuation curve of the blue light of the organic light emitting diode, compared with fig. 1b, the attenuation speed of the quantum dot-green light is greatly increased at a large view angle, and the attenuation speed is faster than that of the quantum dot-green light; the embodiment effectively increases the decay speed of quantum dot-red light and quantum dot-green light and increases the light extraction efficiency of the positive viewing angle of the display device by arranging the first medium layer with high refractive index and the lens layer with low refractive index on the side of the color conversion layer far away from the substrate, thereby reducing the power consumption.
In a specific example, as shown in fig. 4, an orthographic projection of the first dielectric layer on the substrate coincides with the substrate.
In the embodiment, the light paths of the quantum dot-red light and the quantum dot-green light with large viewing angles are changed by covering the lens layer, so that the attenuation speeds of the quantum dot-red light and the quantum dot-green light are increased.
In another specific example, as shown in fig. 6, an orthographic projection of the first dielectric layer on the substrate partially overlaps with an orthographic projection of the lens layer on the substrate, and the opening of the first dielectric layer is larger than the opening of the lens layer.
In the embodiment, the patterned first medium layer is arranged, and the opening of the first medium layer is larger than the opening of the lens layer, so that light emitted from the large viewing angle of the quantum dot-red light and the quantum dot-green light firstly enters the first medium layer with high refractive index to be totally reflected on the contact surface of the lens layer with low refractive index, the light path of the light emitted from the large viewing angle of the quantum dot-red light and the quantum dot-green light is changed, and the attenuation speed of the quantum dot-red light and the attenuation speed of the quantum dot-green light are increased; meanwhile, by arranging the patterned first dielectric layer, the light emitted from the first dielectric layer in the lateral direction can form a refraction surface of the first dielectric layer with high refractive index and the external dielectric layer on the patterned edge surface, so that the light emitted from the first dielectric layer in the lateral direction is refracted on the contact surface, the light emitted in the lateral direction is further converged towards the middle, the side viewing angles of quantum dot-red light and quantum dot-green light are further reduced, and the attenuation speeds of quantum dot-red light and quantum dot-green light are accelerated.
To further improve the white light color shift problem, in an alternative embodiment, as shown in fig. 7a and 7b, the display substrate further comprises a color resist layer 70 disposed on the second inorganic encapsulation layer,
the color resistance layer 70 is arranged on one side of the light extraction layer 60 close to the substrate 10 or on one side of the light extraction layer 60 far away from the substrate 10;
the color resist layer 70 includes a black matrix 71, and color resist materials disposed in a portion of an opening defined by the black matrix 71, the color resist materials including a red color resist material 721 corresponding to the red sub-pixel 100 and a green color resist material 722 corresponding to the green sub-pixel 200, the black matrix opening corresponding to the blue sub-pixel 300 being larger than, and corresponding to, the black matrix openings of the red sub-pixel 100 and the green sub-pixel 200.
In a specific example of this embodiment, as shown in fig. 7a, the color-resist layer 70 is disposed on one side of the light extraction layer 60 close to the substrate 10, that is, the color-resist layer 70 is disposed on the encapsulation layer 50, and by disposing the black matrix openings corresponding to the red sub-pixel 100 and the green sub-pixel 200 on the color-resist layer 70, the viewing angles of quantum dot-red light and quantum dot-green light are further shortened, and the large viewing angle attenuation speeds of quantum dot-red light and quantum dot-green light are increased. Specifically, the opening of the black matrix relative to the blue sub-pixel 300 is larger than the openings of the black matrix relative to the red sub-pixel 100 and the green sub-pixel 200, that is, the opening formed by the black matrix and provided with the color resistor 721 of the red sub-pixel 100 and the opening formed by the color resistor 722 of the green sub-pixel 200 are both smaller than the opening provided with the blue sub-pixel 300, and in this embodiment, the opening of the color resistor layer 70 corresponding to the blue sub-pixel 300 is filled with a blue color resistor 723 or a light-transmitting material 723.
For example, in one example, as shown in fig. 7a, the color-resist layer 70 includes openings of different sub-pixels defined by a black matrix, such as a red color resist 721 disposed in the opening corresponding to the red sub-pixel 100, a green color resist 722 disposed in the opening corresponding to the green sub-pixel 200, and a blue color resist 723 disposed in the opening corresponding to the blue sub-pixel 300; and by limiting the black matrix openings of the blue sub-pixel 300 to be larger than the black matrix openings of the red sub-pixel 100 and the green sub-pixel 200, the viewing angles of quantum dot-red light and quantum dot-green light are effectively shortened, and the large viewing angle attenuation speed of quantum dot-red light and quantum dot-green light is accelerated.
In view of further improving the light transmittance of blue light, in one example, the color resistance of each sub-pixel is formed in combination with a color conversion layer and a color resistance layer. Specifically, the quantum dot-red light material 524 is disposed in the opening defined by the pixel dam of the color conversion layer 52 with respect to the red sub-pixel 100, the quantum dot-green light material 523 is disposed in the opening defined by the pixel dam of the color conversion layer 52 with respect to the green sub-pixel 200, and the blue color resist 522 is disposed in the opening defined by the pixel dam of the color conversion layer 52 with respect to the blue sub-pixel 300, that is, the blue color resist 522 is formed on the color conversion layer, so that the transmittance of blue light is effectively increased and the manufacturing cost of the display substrate is reduced, and meanwhile, the light-transmitting material is disposed in the opening of the color resist layer corresponding to the blue sub-pixel 300. On the basis of setting the blue color resists to the color conversion layer, only the red color resists of the red sub-pixels 100 and the green color resists of the green sub-pixels 200 are formed on the color resist layer, and the light-emitting viewing angles of the red and green lights are further shortened by defining the sizes of the black matrix openings of the different sub-pixels of the color resist layer.
It should be noted that, because the thickness of the color resistor affects the transmittance, in this embodiment, the thickness of the blue color resistor is less than or equal to the thickness of the pixel dam, and it should be understood by those skilled in the art that the heights of the film layers of the display substrate in the blue sub-pixel 300 area may be different, and the film layers should be set by those skilled in the art according to actual application requirements, and details are not described herein.
In a specific example of the present embodiment, as shown in fig. 7b, the color-resist layer 70 is disposed on the side of the light extraction layer 60 away from the substrate 10, that is, the color-resist layer 70 is disposed on the light extraction layer 60, and by disposing the black matrix openings corresponding to the red sub-pixel 100 and the green sub-pixel 200 on the color-resist layer 70, the viewing angles of the quantum dot-red light and the quantum dot-green light are further shortened, and the large viewing angle attenuation speeds of the quantum dot-red light and the quantum dot-green light are increased. Specifically, the opening of the black matrix relative to the blue sub-pixel 300 is larger than the openings of the black matrix relative to the red sub-pixel 100 and the green sub-pixel 200, that is, the opening formed by the black matrix and provided with the color resistor 721 of the red sub-pixel 100 and the opening formed by the color resistor 722 of the green sub-pixel 200 are both smaller than the opening provided with the blue sub-pixel 300, and in this embodiment, the opening of the color resistor layer 70 corresponding to the blue sub-pixel 300 is filled with a blue color resistor 723 or a light-transmitting material 723.
Referring to the foregoing embodiments, the example of disposing the blue color resistor on the color resistor layer or on the color conversion layer is also applicable to this embodiment, and modifications performed by those skilled in the art on this basis are within the protection scope of the present application and will not be described herein again.
In order to further shorten the viewing angles of the red light and the green light, in an alternative embodiment, the black matrix openings corresponding to the red sub-pixels and the green sub-pixels are smaller than or equal to the openings of the lens layer.
In this embodiment, as shown in fig. 7a and 7b, when the aperture of the black matrix of red and green light is smaller than or equal to the aperture of the lens layer, the faster the large viewing angle attenuation speed of the red and green light is, i.e. the aperture of the black matrix limits the large viewing angle of the red and green light to emit light, thereby shortening the viewing angle of the red and green light, matching the large viewing angle attenuation speed of the blue light of the organic light emitting diode, and further effectively improving the white light color shift problem.
It is worth noting that when the openings of the black matrix are larger than the openings of the lens layer, the external quantum efficiency of the quantum dot-red light and quantum dot-green light can be improved. Considering that in the foregoing embodiment of the present application, the light extraction efficiency of red light and green light has been weakened by setting the pixel dam height of the color conversion layer, and the viewing angle of red light and green light has been matched with the viewing angle attenuation of quantum dot-red light, quantum dot-green light, and organic light emitting diode blue light by combining the color conversion layer and the light extraction layer, a person skilled in the art should select, according to the actual application requirements, a design focus on shortening the viewing angle of red light and green light or improving the external quantum efficiency of the color conversion layer, and appropriately design the black matrix openings, which are within the protection scope of the present application and are not described herein again.
In an optional embodiment, the color conversion layer includes a pixel dam and a filling material disposed in at least a portion of an opening defined by the pixel dam, a black matrix opening corresponding to the red sub-pixel and the green sub-pixel is smaller than or equal to an opening of the lens layer, an opening of the lens layer is larger than or equal to an opening of the pixel dam, and an opening of the pixel dam corresponding to the blue sub-pixel is filled with a blue color resist.
In the present embodiment, the color resistance of each sub-pixel is formed by disposing the blue color resistance of the blue sub-pixel in the color conversion layer, and disposing the red color resistance of the red sub-pixel and the green color resistance of the green sub-pixel in the color resistance layer, that is, by combining the color conversion layer and the color resistance layer. On the basis, the red sub-pixel and the green sub-pixel are limited in the black matrix opening of the color resistance layer, the corresponding lens layer opening and the opening of the pixel dam, so that the light emitting angles of red light and green light are further limited, the visual angles of the red light and the green light are shortened, the attenuation speed of the red light and the green light at a large visual angle is accelerated, and the color cast problem of white light is effectively improved.
In an alternative embodiment, as shown in fig. 8, the display substrate further comprises a color resist layer 70 disposed on the second inorganic encapsulation layer 53,
the color resist layer 70 includes a black matrix 71, color resist materials 721, 722, and 723 disposed in openings defined by the black matrix 71, and a second dielectric layer 73 covering the color resist materials and the black matrix 71, wherein,
the color-resistant material includes a red color-resistant material 721 corresponding to the red sub-pixel, a green color-resistant material 722 corresponding to the green sub-pixel, and a blue color-resistant material 723 corresponding to the blue sub-pixel, and the red color-resistant material 721 and the green color-resistant material 722 include a plurality of concave structures, the blue color-resistant material 723 includes a plurality of convex structures, and black matrix openings corresponding to the red sub-pixel and the green sub-pixel are smaller than black matrix openings corresponding to the blue sub-pixel;
the refractive index of the second medium layer 73 is greater than that of the color-resistant material, and the color-resistant material and the second medium layer are multiplexed to form a light extraction layer. In this embodiment, through the color-resistant material of each sub-pixel arranged in a patterned manner and the second dielectric layer arranged in a matching manner with the color-resistant material, the color-resistant layer not only realizes the color-resistant function and improves the light-emitting efficiency of each sub-pixel, but also shortens the viewing angles of red light and green light by defining the opening of the black matrix, and multiplexes the color-resistant material of each sub-pixel and the relationship between the refractive index of each color-resistant material and the refractive index of the second dielectric layer into the light-taking-out layer to further match the attenuation speed of the viewing angle of the light emitted by each sub-pixel. Specifically, the black matrix openings corresponding to the blue sub-pixel 300 are larger than the black matrix openings corresponding to the red sub-pixel 100 and the green sub-pixel 200, so that the large-viewing-angle light emission of red light and green light is further reduced, that is, the large-viewing-angle attenuation of the red light and the green light is accelerated; meanwhile, the second medium layer with a higher refractive index is used to cover the color-resisting material with a lower refractive index, the color-resisting material 721 of the red sub-pixel 100 and the color-resisting material 722 of the green sub-pixel 200 are set as concave lenses, that is, convex lenses of the second medium layer are formed relative to the emergent light, so that the emergent light is converged to reduce the large-viewing-angle light emission of the red light and the green light, and the color-resisting material of the blue sub-pixel 300 is set as convex lenses, that is, concave lenses of the second medium layer are formed relative to the emergent light, so that the emergent light is diverged to increase the large-viewing-angle light emission of the blue light, thereby accelerating the large-viewing-angle attenuation speed of the red light and the green light, slowing down the large-viewing-angle attenuation speed of the blue light, and effectively improving the white color cast of the display substrate.
It should be noted that the embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
Corresponding to the display substrate provided in the foregoing embodiments, an embodiment of the present application further provides a manufacturing method for manufacturing the display substrate, and since the manufacturing method provided in the embodiment of the present application corresponds to the display substrate provided in the foregoing embodiments, the foregoing embodiment is also applicable to the manufacturing method provided in the present embodiment, and is not described in detail in the present embodiment.
As shown in fig. 3, an embodiment of the present application further provides a manufacturing method for manufacturing the display substrate, including:
an organic light emitting layer formed on the substrate and including a plurality of light emitting cells arranged in an array;
a first inorganic encapsulation layer formed on the organic light emitting layer;
a color conversion layer formed on the first inorganic encapsulation layer, forming each color light in response to driving of light emitted from the light emitting unit to synthesize white light;
and a second inorganic encapsulation layer formed on the color conversion layer, wherein the first inorganic encapsulation layer, the color conversion layer and the second inorganic encapsulation layer form an encapsulation layer of the organic light emitting layer.
According to the display substrate manufactured by the embodiment, the color conversion layer is arranged in the packaging layer and is used as a part of the packaging layer, and the distance between the quantum dot layer and the organic light emitting layer is effectively shortened, so that the problem of light leakage caused by the fact that the peripheral color conversion layer emits light due to the large-angle light of the organic light emitting diode is effectively solved, and the problem of color cast of white light is effectively improved through the limited color conversion layer.
Based on the display substrate, another embodiment of the present invention provides a display device, which includes the display substrate, and the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, or a navigator.
Aiming at the existing problems, the invention provides a display substrate, a display device and a manufacturing method, wherein a color conversion layer is arranged in a packaging layer and is used as a part of the packaging layer, and the distance between the color conversion layer and an organic light-emitting layer is effectively shortened, so that the light leakage problem caused by the fact that the peripheral color conversion layer emits light due to the large-angle light of an organic light-emitting diode is effectively solved, and the color cast problem of white light is effectively improved through the limited color conversion layer; particularly, the light extraction layer comprises the low-folding lens layer and the high-folding lens layer, so that the total reflection of red light and green light emitted from the color conversion layer is realized on the contact surface from the high-folding lens layer to the low-folding lens layer to reduce the large visual angle light of the red light and the green light, the large visual angle attenuation of the red light and the green light is accelerated, the color cast problem of white light is further improved, the color cast problem in the related technology can be solved, the display effect of the display device is effectively improved, the user experience is further improved, and the wide application prospect is achieved.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (11)
1. A display substrate comprising a substrate, an organic light emitting layer, a first inorganic encapsulating layer, a color conversion layer, and a second inorganic encapsulating layer, which are formed on the substrate in a laminated manner,
the organic light-emitting layer comprises a plurality of light-emitting units arranged in an array;
the color conversion layer is used for responding to the driving of the emergent light of the light emitting unit to form various colors of light so as to synthesize white light;
the first inorganic packaging layer, the color conversion layer and the second inorganic packaging layer form a packaging layer of the organic light emitting layer.
2. The display substrate of claim 1, wherein the first inorganic encapsulation layer comprises at least one of SiNO and SiNx, and wherein a thickness of the first inorganic encapsulation layer is 2 μm or more and 3 μm or less.
3. The display substrate according to claim 1, wherein the color conversion layer comprises a pixel dam and a filling material disposed in at least a portion of an opening defined by the pixel dam, wherein the filling material is filled in the opening
In the direction vertical to the substrate, the thickness of the pixel dam is more than or equal to 3 μm and less than or equal to 20 μm;
at least a portion of the fill material comprises a quantum dot material.
4. The display substrate according to any one of claims 1 to 3, wherein the display substrate comprises a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and further comprises a light extraction layer disposed on the second inorganic encapsulation layer and disposed on the red sub-pixel and the green sub-pixel, comprising:
a lens layer arranged on the second inorganic packaging layer at intervals, wherein the orthographic projection of the lens layer on the substrate covers the orthographic projection of the intervals of the adjacent red sub-pixels and green sub-pixels on the substrate; and
the first medium layer at least partially covers the lens layer, the refractive index of the first medium layer is larger than that of the lens layer, the orthographic projection of the first medium layer on the substrate covers the orthographic projection of the red sub-pixel on the substrate, and the orthographic projection of the first medium layer on the substrate covers the orthographic projection of the green sub-pixel on the substrate.
5. The display substrate according to claim 4, wherein in a direction perpendicular to the substrate,
the thickness of the lens layer is more than or equal to 1.5 mu m and less than or equal to 3 mu m, and the refractive index of the lens layer is more than or equal to 1.3 and less than or equal to 1.5;
the thickness of the first medium layer is more than or equal to 3 mu m and less than or equal to 6 mu m, and the refractive index of the first medium layer is more than or equal to 1.7 and less than or equal to 1.9.
6. The display substrate according to claim 4,
the orthographic projection of the first dielectric layer on the substrate is superposed with the substrate;
or
The orthographic projection of the first medium layer on the substrate is partially overlapped with the orthographic projection of the lens layer on the substrate, and the opening of the first medium layer is larger than that of the lens layer.
7. The display substrate of claim 4, further comprising a color resist layer disposed on the second inorganic encapsulation layer,
the color resistance layer is arranged on one side of the light extraction layer close to the substrate or one side of the light extraction layer far away from the substrate;
the color resistance layer comprises a black matrix and color resistance materials arranged in partial openings defined by the black matrix, the color resistance materials comprise red color resistance materials corresponding to the red sub-pixels and green color resistance materials corresponding to the green sub-pixels, and the openings of the black matrix corresponding to the blue sub-pixels are larger than and correspond to the openings of the black matrix of the red sub-pixels and the green sub-pixels.
8. The display substrate of claim 7,
the black matrix openings corresponding to the red sub-pixels and the green sub-pixels are less than or equal to the openings of the lens layer;
and/or
The color conversion layer comprises a pixel dam and a filling material arranged in at least part of an opening defined by the pixel dam, a black matrix opening corresponding to the red sub-pixel and the green sub-pixel is smaller than or equal to the opening of the lens layer, the opening of the lens layer is larger than or equal to the opening of the pixel dam, and a blue color resistor is filled in the opening of the pixel dam corresponding to the blue sub-pixel.
9. The display substrate according to any one of claims 1-3, further comprising a color resist layer disposed on the second inorganic encapsulation layer,
the color resistance layer comprises a black matrix, a color resistance material arranged in an opening defined by the black matrix, and a second medium layer covering the color resistance material and the black matrix,
the color-resisting material comprises a red color-resisting material corresponding to the red sub-pixel, a green color-resisting material corresponding to the green sub-pixel, and a blue color-resisting material corresponding to the blue sub-pixel, and the red color-resisting material and the green color-resisting material comprise a plurality of concave structures, the blue color-resisting material comprises a plurality of convex structures, and the black matrix opening corresponding to the red sub-pixel and the green sub-pixel is smaller than the black matrix opening corresponding to the blue sub-pixel;
the refractive index of the second medium layer is larger than that of the color resistance material, and the color resistance material and the second medium layer are multiplexed to form a light extraction layer.
10. A display device comprising the display substrate according to any one of claims 1 to 9.
11. A method of manufacturing a display substrate according to any one of claims 1 to 9, comprising:
an organic light emitting layer formed on the substrate and including a plurality of light emitting cells arranged in an array;
a first inorganic encapsulation layer formed on the organic light emitting layer;
a color conversion layer formed on the first inorganic encapsulation layer, forming each color light in response to driving of light emitted from the light emitting unit to synthesize white light;
a second inorganic encapsulation layer formed on the color conversion layer, the first inorganic encapsulation layer, the color conversion layer and the second inorganic encapsulation layer forming an encapsulation layer of the organic light emitting layer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115942828A (en) * | 2023-02-17 | 2023-04-07 | 惠科股份有限公司 | Display panel, manufacturing method and display device |
| CN116600605A (en) * | 2023-07-12 | 2023-08-15 | 昆山国显光电有限公司 | Display panel and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115942828A (en) * | 2023-02-17 | 2023-04-07 | 惠科股份有限公司 | Display panel, manufacturing method and display device |
| CN116600605A (en) * | 2023-07-12 | 2023-08-15 | 昆山国显光电有限公司 | Display panel and display device |
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