CN113540054A - Display panel, preparation method thereof and display device - Google Patents
Display panel, preparation method thereof and display device Download PDFInfo
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- CN113540054A CN113540054A CN202110817173.2A CN202110817173A CN113540054A CN 113540054 A CN113540054 A CN 113540054A CN 202110817173 A CN202110817173 A CN 202110817173A CN 113540054 A CN113540054 A CN 113540054A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
- H01L33/46—Reflective coating, e.g. dielectric Bragg reflector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/54—Encapsulations having a particular shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
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Abstract
The invention provides a display panel, a preparation method thereof and a display device. The display panel comprises a substrate, light emitting diodes of different colors arranged on the substrate, and a light dispersion structure, wherein the light dispersion structure is positioned on one side of the light emitting diodes, which deviates from the substrate, and the light dispersion structure coats the light emitting diodes, so that light emitted by the light emitting diodes can be scattered. This display panel can improve the inconsistent problem of emitting diode visual angle space luminance distribution of different colours through setting up light dispersion structure to improve this display panel's visual angle colour cast phenomenon, and then promote this display panel's display effect.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display panel, a preparation method thereof and a display device.
Background
In the LED display industry, with the increasingly precise and extensive application of display products with small spacing between LEDs, Mini/Micro LED (Mini/Micro light emitting diode) display is upgraded as a small-spacing display screen technology, becoming a new generation of display technology at present, and developing rapidly. Mini/Micro LED and conventional LED display products are increasingly applied to industrial design, high-end commercial display, intelligent control room, high-definition studio, educational medical screen, home theater, high-end retail store and other industries for display. With the continuous maturity of 5G and Internet of things technologies, the requirements of various industries on LED display products are higher and higher.
At present, due to the fact that a Mini/Micro RGB LED (namely a Mini/Micro red-green-blue light emitting diode chip) has the problem of inconsistent visual angle space brightness distribution in display due to the preparation process of the Mini/Micro RGB LED and the structure and materials of the Mini/Micro red-green-blue light emitting diode chip, namely, the luminous light types of the red-green-blue light emitting diode chip are not uniform, so that when a white picture is displayed, the phenomenon that colors observed by a front visual angle and a side visual angle are inconsistent can occur due to the change of the luminous brightness proportion of the red-green-blue light emitting diode chip in different space angles, namely, the visual angle color cast phenomenon exists in the display of a Mini/Micro LED display product.
Disclosure of Invention
The invention provides a display panel, a preparation method thereof and a display device aiming at the problems. This display panel can improve the inconsistent problem of emitting diode visual angle space luminance distribution of different colours through setting up light dispersion structure to improve this display panel's visual angle colour cast phenomenon, and then promote this display panel's display effect.
The invention provides a display panel, which comprises a substrate, light-emitting diodes with different colors arranged on the substrate, and a light dispersion structure, wherein the light dispersion structure is positioned on one side of the light-emitting diodes, which is far away from the substrate, and the light dispersion structure coats the light-emitting diodes and can scatter light emitted by the light-emitting diodes.
Optionally, the light dispersing structure comprises a matrix and scattering particles, the scattering particles being dispersed in the matrix;
the substrate is light-transmitting;
the scattering particles can scatter and reflect light irradiated to the scattering particles;
and/or the scattering particles can scatter and transmit light irradiated thereon.
Optionally, the substrate is made of an optically transparent adhesive material;
the scattering particles adopt nano or micron magnesium oxide particles;
and/or the scattering particles adopt nano or micron titanium dioxide particles;
and/or, the scattering particles adopt nano or micron-sized silicon dioxide particles.
Optionally, the thickness of the substrate is in a range of 10 to 200 μm.
Optionally, the mass percentage of the scattering particles in the matrix ranges from 0.1% to 20%.
Optionally, the orthographic projection shape of the base body on the substrate comprises a circle, an ellipse, a rectangle or a square;
the edge contour of the base body along the section vertical to the substrate is arc-shaped or rectangular frame-shaped close to the side opening of the substrate.
Optionally, the light emitting diodes include a plurality of red light emitting diodes, a plurality of green light emitting diodes, and a plurality of blue light emitting diodes, and the plurality of red light emitting diodes, the plurality of green light emitting diodes, and the plurality of blue light emitting diodes are arranged in an array;
the number of the light ray dispersing structures is multiple, and the light ray dispersing structures are distributed in a one-to-one correspondence manner with the light emitting diodes with different colors; any two adjacent light ray dispersion structures are mutually spaced;
or any two adjacent light ray dispersing structures are connected with each other.
Optionally, the mass percentage of the scattering particles in the matrix in the light dispersing structure correspondingly covering the red light emitting diode is greater than the mass percentage of the scattering particles in the matrix in the light dispersing structure correspondingly covering the green light emitting diode and the blue light emitting diode.
Optionally, the thickness of the matrix in the light ray dispersion structure correspondingly covering the red light emitting diode is greater than or equal to the thickness of the matrix in the light ray dispersion structure correspondingly covering the green light emitting diode and the blue light emitting diode.
Optionally, the shape of the matrix in the light scattering structure correspondingly covering the red light emitting diode is different from the shape of the matrix in the light scattering structure correspondingly covering the green light emitting diode and the blue light emitting diode.
Optionally, a reflection suppression layer and a protective layer are further included; the reflection inhibition layer and the protective layer are arranged on one side of the light ray dispersion structure, which is far away from the light emitting diode, and the reflection inhibition layer and the protective layer are sequentially distributed far away from the light ray dispersion structure;
the light transmittance of the reflection inhibition layer ranges from 1% to 10%, and the reflection inhibition layer can inhibit the light irradiated on the reflection inhibition layer from reflecting.
Optionally, a side surface of the reflection suppression layer close to the light ray dispersion structure is matched with a side surface of the light ray dispersion structure far away from the substrate in shape; the surface of one side of the reflection inhibition layer, which is far away from the light ray dispersion structure, is a plane;
the thickness of a portion of the reflection-repressing layer in contact with the substrate is greater than the thickness of a portion of the reflection-repressing layer in contact with the light-dispersing structure.
Optionally, the shape of the reflection suppression layer is matched with the shape of the surface of the side, away from the substrate, of the light ray dispersion structure;
the reflection suppressing layer has a uniform thickness.
Optionally, the reflection suppressing layer is located between the reflection suppressing layer and the light scattering structure, a side surface of the reflection suppressing layer close to the transparent adhesive layer and a side surface of the reflection suppressing layer away from the transparent adhesive layer are both flat, and the thickness of the reflection suppressing layer is uniform.
Optionally, the reflection inhibition layer adopts an optical transparent glue material added with carbon black;
the protective layer is made of PET, PI or PC materials.
The invention also provides a display device comprising the display panel.
The invention also provides a preparation method of the display panel, which comprises the following steps: transferring the prepared light emitting diodes with different colors to a substrate;
and preparing the light ray dispersion structure on the substrate after the steps are finished by adopting an ink-jet printing process.
The invention has the beneficial effects that: according to the display panel provided by the invention, light rays emitted by the light emitting diodes with different colors pass through the light ray dispersion structure, the light rays originally transmitted towards a certain direction irradiate on the light ray dispersion structure, and the transmission direction of the light rays is deflected due to the scattering effect of the light ray dispersion structure on the light rays, so that the transmission direction of the original light rays is changed; light is through the scattering of light dispersion structure, the light type distribution that enables light type distribution curve originally and tend to lambert's body scattering distributes to the inconsistent light type of visual angle space luminance distribution that makes the emitting diode of different colours exist originally tends to the light type of lambert's body scattering after the scattering of light dispersion structure, and then improved the inconsistent problem of emitting diode visual angle space luminance distribution of different colours greatly, finally improved this display panel's visual angle colour cast phenomenon, promoted display panel's display effect.
According to the display device provided by the invention, by adopting the display panel, the phenomenon of visual angle color cast of the display device is improved, and the display effect of the display device is improved.
Drawings
FIG. 1 is a schematic diagram of a Mini LED display screen pad pasting in the prior art;
FIG. 2 is a graph of the luminous patterns of the RGB LEDs in the Mini LED display of FIG. 1;
FIG. 3 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the present invention;
FIG. 4a is a schematic top view of the display panel shown in FIG. 3;
FIG. 4b is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
FIG. 4c is a schematic top view of the display panel shown in FIG. 4 b;
FIG. 5 is a schematic view of a color shift curve of a viewing angle obtained by a simulation test performed on the display panel shown in FIG. 4b and FIG. 1 under certain conditions;
FIG. 6a is a schematic cross-sectional view illustrating a structure of another display panel according to an embodiment of the present invention;
FIG. 6b is a schematic view of a color shift curve of a viewing angle obtained by a simulation test performed on the display panel shown in FIG. 6a and FIG. 1 under certain conditions;
FIG. 7 is a schematic cross-sectional view illustrating a structure of another display panel according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view illustrating a structure of another display panel according to an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view illustrating a structure of another display panel according to an embodiment of the present invention;
fig. 10 is a schematic view of a manufacturing method of a display panel according to an embodiment of the invention.
Wherein the reference numerals are:
1. a substrate; 2. a light emitting diode; 21. a red light emitting diode; 22. a green light emitting diode; 23. a blue light emitting diode; 3. a light dispersing structure; 31. a substrate; 32. scattering particles; 4. a reflection-suppressing layer; 5. a protective layer; 6. a transparent adhesive layer; 7. black film; 8. and (5) protective glue.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, a display panel, a method for manufacturing the same, and a display device according to the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
The Mini LED (i.e., Mini LED) is defined as: the LED device with the chip size of 50-200 mu m; micro LEDs (i.e., Micro light emitting diodes) are defined as: and the chip size of the LED device is below 50 mu m.
In the disclosed technology, as shown in fig. 1, which is a schematic diagram of a Mini LED display screen film, a black film 7 and a protective adhesive 8 are attached to a Mini LED substrate 1 after crystal solidification to manufacture a display screen, and due to the preparation process of a Mini red, green and blue (RGB) color light emitting diode (21, 22,23) chip and the structure and material of the chip, the problem of inconsistent brightness distribution of a viewing angle space exists during display, that is, the light emitting types of the red, green and blue light emitting diode (21, 22,23) chips are not uniform; as shown in fig. 2, the difference of the light emission pattern between the red led 21 chip and the green-blue led (22,23) chip is large, which may cause the phenomenon that the colors viewed from the front viewing angle and the side viewing angle are inconsistent due to the variation of the ratio of the light emission luminance of the red-green-blue led (21, 22,23) chips at different spatial angles when displaying the white image, for example: the corrected front viewing angle is a white picture, but when the front viewing angle is viewed at a larger side viewing angle, the display picture is reddish or bluish, and the viewing angle color cast phenomenon is serious.
In order to solve the problem of the viewing angle color shift phenomenon caused by the inconsistent spatial brightness distribution of the viewing angle of the Mini/Micro LED display screen, as shown in fig. 3, an embodiment of the invention provides a display panel, which includes a substrate 1, light emitting diodes 2 of different colors arranged on the substrate 1, and a light dispersing structure 3 located on one side of the light emitting diodes 2 away from the substrate 1, wherein the light dispersing structure 3 covers the light emitting diodes 2, and can scatter the light emitted by the light emitting diodes 2.
The light emitting diode 2 may be a Mini LED or a Micro LED.
In the present embodiment, the light dispersing structure 3 includes a matrix 31 and scattering particles 32, and the scattering particles 32 are dispersed in the matrix 31; the substrate 31 is light transmissive; the scattering particles 32 can scatter and reflect light irradiated thereto.
Optionally, the substrate 31 is made of an optically transparent adhesive material; the scattering particles 32 are nano or micron magnesium oxide particles; and/or, the scattering particles 32 are nano-sized or micro-sized titanium dioxide particles.
Alternatively, the scattering particles 32 may be capable of scattering and transmitting light incident thereon. Such as scattering particles 32, may also be nano-sized or micro-sized silica particles. It should be noted that if the scattering particles 32 can scatter and transmit light, the refractive index of the scattering particles 32 and the refractive index of the matrix 31 cannot be the same, so that the scattering particles 32 dispersed in the matrix 31 can normally scatter light irradiated thereto.
In this embodiment, the light emitted from the light emitting diode 2 passes through the scattering particles 32 in the matrix 31 to change the original light distribution curve of the light emitting diode 2, where the light distribution curve refers to the spatial brightness distribution of the light emitted from the light emitting diode 2. The method specifically comprises the following steps: light rays emitted by the light emitting diodes 2 of different colors pass through the scattering particles 32 in the matrix 31, light rays originally propagating towards a certain direction irradiate on the scattering particles 32, and the propagation direction of the light rays is deflected due to the scattering effect of the scattering particles 32 on the light rays, so that the propagation direction of the original light rays is changed; light is scattered through a large amount of scattering particles 32, and the light type distribution that enables light type distribution curve originally and tends to lambertian body scattering is distributed to the light type that the inconsistent light type of visual angle space luminance distribution that makes emitting diode 2 of different colours originally exist tends to lambertian body scattering after the scattering of a large amount of scattering particles 32, and then has improved the inconsistent problem of 2 visual angle space luminance distributions of emitting diode of different colours greatly, has finally improved this display panel's visual angle colour cast phenomenon.
Optionally, the thickness of the substrate 31 is in a range of 10 to 200 μm. Optionally, the mass percentage of the scattering particles 32 in the matrix 31 ranges from 0.1% to 20%. The substrate 31 for coating the light emitting diode 2 is designed to have an equal thickness. Of course, the substrate 31 covering the light emitting diode 2 may be designed to have different thicknesses. So set up, can ensure to a certain extent that the inconsistent light type of visual angle space luminance distribution that emitting diode 2 exists originally tends to lambert scattered light type after the scattering of a large amount of scattering particles 32 to emitting diode 2 visual angle space luminance distribution inconsistent problem has been improved greatly.
Optionally, in this embodiment, the orthographic projection shape of the base 31 on the substrate 1 includes a circle, an ellipse, a rectangle or a square; the edge profile of the base 31 along a cross section perpendicular to the substrate 1 is an arc or a rectangular frame shape open close to the substrate 1 side. As shown in fig. 4a and 3, the orthographic projection shape of the base 31 on the substrate 1 is a circle, and the edge contour of the base 31 along the cross section perpendicular to the substrate 1 is a semicircular arc; as shown in fig. 4b and 4c, the base 31 has a rectangular shape in an orthogonal projection on the substrate 1, and the edge contour of the base 31 along a cross section perpendicular to the substrate 1 has a rectangular frame shape open to the side of the substrate 1.
As shown in fig. 5, fig. 4b and fig. 1, in order to illustrate the effectiveness of the light dispersing structure 3 in improving the viewing angle color shift of the display panel in the present embodiment, a simulation test is performed by taking a kind of scattering particles 32 as an example. In the simulation test, magnesium oxide is used as the material of the scattering particles 32, the particle size of the scattering particles 32 is 200nm, the mass percentage of the scattering particles 32 dispersed in the matrix 31 is 3% and 10%, respectively, the orthographic projection shape of the matrix 31 covering the light emitting diode 2 on the substrate 1 is a rectangle, the edge profile of the matrix 31 along the cross section perpendicular to the substrate 1 is a rectangular frame shape opening close to the substrate 1 side, the thickness of the matrix 31 is set to be 60 μm, fig. 5 is a graph simulating that the mass percentage of the scattering particles 32 in the matrix 31 in the display panel shown in fig. 4b is 3% and 10%, respectively, and the viewing angle color shift curves corresponding to the display panel in fig. 1 are respectively. The viewing angle color cast curve represents the display color difference between the front viewing angle and other viewing angles of the display panel, and the larger the viewing angle color cast value is, the larger the color cast difference is. Comparing the color shift curves of the viewing angles, it can be found that the color shift of the viewing angle of the display panel is reduced under the viewing angles after the magnesium oxide scattering particles 32 are added, and the color shift of the viewing angle of the display panel is further reduced by 10% by mass of the scattering particles 32 in the matrix 31 compared with 3% by mass of the scattering particles 32, which shows that the color shift of the viewing angle of the display panel is obviously improved after the scattering particles 32 are added, and the improvement effect of the color shift of the viewing angle is more obvious as the mass percentage of the scattering particles 32 in the matrix 31 is increased.
Alternatively, as shown in fig. 3 to 4c, the light emitting diode 2 includes a plurality of red light emitting diodes 21, a plurality of green light emitting diodes 22 and a plurality of blue light emitting diodes 23, and the plurality of red light emitting diodes 21, the plurality of green light emitting diodes 22 and the plurality of blue light emitting diodes 23 are arranged in an array; the number of the light dispersing structures 3 is multiple, and the multiple light dispersing structures 3 are distributed in one-to-one correspondence with the multiple light emitting diodes 2 with different colors; and any two adjacent light scattering structures 3 are spaced from each other. Wherein, the light emitted by the red, green and blue light emitting diode 2 passes through the scattering particles 32 in the matrix 31, the light originally transmitted towards a certain direction irradiates on the scattering particles 32, and the light transmission direction is deflected due to the scattering effect of the scattering particles 32 on the light, so that the original light transmission direction is changed; light is scattered through a large amount of scattering particles 32, and the light type distribution curve that enables originally tends to the light type distribution of lambertian body scattering to the light type that the inconsistent light type of visual angle space luminance distribution that makes originally red green blue emitting diode 2 exist all tends to the lambertian body scattering after the scattering of a large amount of scattering particles 32, and then has improved the inconsistent problem of 2 visual angle space luminance distributions of red green blue emitting diode greatly, has finally improved this display panel's visual angle colour cast phenomenon.
Optionally, the mass percentage of the scattering particles 32 in the matrix 31 in the light dispersing structure 3 corresponding to the coated red light emitting diode 21 is greater than the mass percentage of the scattering particles 32 in the matrix 31 in the light dispersing structure 3 corresponding to the coated green light emitting diode 22 and the coated blue light emitting diode 23.
Optionally, the thickness of the matrix 31 in the light dispersing structure 3 correspondingly covering the red light emitting diode 21 is greater than or equal to the thickness of the matrix 31 in the light dispersing structure 3 correspondingly covering the green light emitting diode 22 and the blue light emitting diode 23.
Alternatively, the shape of the matrix 31 in the light dispersing structure 3 correspondingly covering the red light emitting diode 21 is different from the shape of the matrix 31 in the light dispersing structure 3 correspondingly covering the green light emitting diode 22 and the blue light emitting diode 23.
Referring to fig. 2, the light pattern distribution curves of the green and blue leds 22 and 23 are substantially the same due to the manufacturing process, but the light pattern distribution curve of the red led 21 is greatly different from the light pattern distribution curves of the green and blue leds. Therefore, by performing the differential design on the substrate 31 covering the red light emitting diode 21 and the substrate 31 covering the green light emitting diode 22 and the blue light emitting diode 23, for example, by designing parameters such as the types, doping quality percentages, thicknesses of the substrate 31, and shapes of the substrate 31 of the red light emitting diode 21, the green light emitting diode 22, and the blue light emitting diode 23 differently, the light pattern distribution curve of the red light emitting diode 21 can be better made to be consistent with the light pattern distribution curves of the green light emitting diode 22 and the blue light emitting diode 23, so as to better improve the viewing angle color cast phenomenon of the display panel.
As shown in fig. 6a, fig. 6b and fig. 1, in order to illustrate that the light scattering structures 3 corresponding to the light emitting diodes 2 with different colors are arranged differently in the present embodiment to better improve the viewing angle color shift of the display panel, a simulation test is performed by taking one scattering particle 32 as an example. In a simulation test, magnesium oxide is used as a material of the scattering particles 32, the particle size of the scattering particles 32 is 200nm, the mass percentage of the scattering particles 32 dispersed in the matrix 31 in the light dispersing structure 3 covering the red light-emitting diode 21 is 5%, the mass percentage of the scattering particles 32 dispersed in the matrix 31 in the light dispersing structure 3 covering the green light-emitting diode 22 and the blue light-emitting diode 23 is 3%, the orthographic projection shape of the matrix 31 covering the red light-emitting diode 21 on the substrate 1 is circular, and the edge contour of the matrix 31 along the cross section perpendicular to the substrate 1 is semicircular arc; the orthographic projection shape of the base body 31 covering the green light-emitting diode 22 and the blue light-emitting diode 23 on the substrate 1 is a rectangle, and the edge contour of the base body 31 along the section vertical to the substrate 1 is a rectangular frame shape which is opened close to the substrate 1 side; the thickness of the substrate 31 is set to 60 μm, and fig. 6b is a color shift curve of viewing angle obtained by simulating the display panel of fig. 6a and 1. The viewing angle color cast curve represents the display color difference between the front viewing angle and other viewing angles of the display panel, and the larger the viewing angle color cast value is, the larger the color cast difference is. Comparing the color shift curves of the viewing angles, it can be found that the color shift of the viewing angle of the display panel is reduced under the viewing angles after the magnesium oxide scattering particles 32 are added, and the color shift of the viewing angle of the display panel can be further reduced by the design of differentiating the shape of the matrix 31 covering the red light-emitting diode 21 from the shape of the matrix 31 covering the green light-emitting diode 22 and the blue light-emitting diode 23.
In this embodiment, as shown in fig. 3, the display panel further includes a reflection suppressing layer 4 and a protective layer 5; the reflection inhibition layer 4 and the protective layer 5 are arranged on one side of the light ray dispersion structure 3, which is far away from the light emitting diode 2, and the reflection inhibition layer 4 and the protective layer 5 are sequentially distributed far away from the light ray dispersion structure 3; the light transmittance of the reflection suppression layer 4 is in the range of 1% to 10%, and the reflection suppression layer 4 can suppress reflection of light irradiated thereon. The provision of the reflection suppressing layer 4 can improve the display contrast of the display panel. The protective layer 5 mainly functions to protect the light exit side surface of the display panel.
Optionally, the reflection inhibition layer 4 is made of an optical transparent glue material added with carbon black; the protective layer 5 is made of PET, PI or PC material. The reflection suppressing layer 4 may be made of other materials having a certain transmittance and capable of suppressing reflection of light irradiated thereto.
In the present embodiment, as shown in fig. 3, the surface of the reflection suppression layer 4 close to the light ray dispersion structure 3 is matched with the surface of the light ray dispersion structure 3 away from the substrate 1; the surface of the reflection suppression layer 4 on the side away from the light ray dispersion structure 3 is a plane; the thickness of the portion of the reflection-repressing layer 4 in contact with the substrate 1 is greater than the thickness of the portion of the reflection-repressing layer 4 in contact with the light-dispersing structure 3. Since any two adjacent light scattering structures 3 are spaced from each other, the reflection suppression layer 4 is in contact with the surface of the substrate 1 in the spacing region between any two adjacent light scattering structures 3, and it can be seen that the light scattering structures 3 arranged at intervals can further increase the coverage area of the reflection suppression layer 4, and the reflection suppression layer 4 with such a structure can better suppress the reflection of light rays irradiated onto the thick portion than the thin portion, so the reflection suppression layer 4 with such a structure has a more significant effect of improving the display contrast of the display panel.
It should be noted that, if more and thicker substrates 31 are needed to ensure the improvement of the viewing angle color shift of the display panel due to the scattering particles 32 or the concentration of the scattering particles 32 in the substrates 31 of the light scattering structures 3, the substrates 31 of adjacent light scattering structures 3 may be connected with each other, that is, any two adjacent light scattering structures are connected with each other, as shown in fig. 7.
Alternatively, as shown in fig. 8, the shape of the reflection suppression layer 4 may also be adapted to the shape of the surface of the side of the light ray dispersion structure 3 facing away from the substrate 1; the thickness of the reflection-repressing layer 4 is uniform. The protective layer 5 fills in the light exit side surface of the display panel. The reflection suppressing layer 4 thus structured can also improve the display contrast of the display panel well.
Optionally, as shown in fig. 9, the display panel further includes a transparent adhesive layer 6 located between the reflection inhibiting layer 4 and the light scattering structure 3, a side surface of the reflection inhibiting layer 4 close to the transparent adhesive layer 6 and a side surface of the reflection inhibiting layer away from the transparent adhesive layer 6 are both flat, and the thickness of the reflection inhibiting layer 4 is uniform. Wherein, the transparent adhesive layer 6 can be made of optical transparent adhesive material. The reflection suppressing layer 4 thus structured also improves the display contrast of the display panel well.
Based on the different structural shapes of the reflection suppression layer 4 in fig. 3, 8, and 9, there are different requirements for the thickness of the reflection suppression layer 4 and the concentration of the melanin (e.g., carbon black) filled therein, such as the requirement that the thickness of the reflection suppression layer 4 is smaller than the height of the light emitting diode 2 for the reflection suppression layer 4 of the structural shapes in fig. 8 and 9. No matter how the thickness of the reflection inhibition layer 4 and the concentration of the melanin (such as carbon black) filled therein are set, the reflection of the incident light can be inhibited well as long as the light transmittance is ensured within 1% -10%.
Based on the above structure of the display panel, this embodiment further provides a method for manufacturing the display panel, as shown in fig. 10, including: step S01: the prepared light emitting diodes 2 of different colors are transferred onto a substrate 1.
In this step, the light emitting diodes 2 of the same color are simultaneously prepared and transferred to the substrate 1 by bulk transfer of the light emitting diodes 2 of the same color. The detailed process is not described again.
Step S02: the light-dispersing structure 3 is prepared on the substrate 1 having completed the above steps using an ink-jet printing process.
In this step, first, the scattering particles 32 are dispersed and mixed in the matrix 31 in a certain mass percentage; then, a high-precision ink-jet printing device is adopted, the printing precision requires that the line width is in a micron level, the positioning resolution of a nozzle is about 100nm, and the printing operation is carried out according to the required appearance of the light ray dispersing structure 3.
In this embodiment, taking the display panel in fig. 3 as an example, the method for manufacturing the display panel further includes: step S03: the reflection-suppressing layer 4 and the protective layer 5 are prepared on the substrate 1 that completes step S02.
In this step, the reflection suppressing layer 4 may be an already-formed adhesive layer, which is directly attached to the substrate 1 that has completed the step S02, and then cured by heating to form the reflection suppressing layer 4; alternatively, the reflection preventing layer 4 may be formed by printing a paste having a certain viscosity on the substrate 1 after the completion of step S02 and curing the paste. The protective layer 5 may be formed of a film layer such as a PET film, a PI film, or a PC film, and may be attached to the substrate 1 on which the reflection suppressing layer 4 is formed.
According to the preparation method of the display panel, the light dispersing structure 3 and the reflection inhibiting layer 4 are respectively prepared, and the light dispersing structure 3 and the reflection inhibiting layer 4 are structurally arranged separately, so that the light dispersing effect of the light dispersing structure 3 on light and the effect of the reflection inhibiting layer 4 on improving the display contrast of the display panel are separated, and the preparation method of the display panel is simple and convenient.
In the display panel, light rays emitted by the light emitting diodes with different colors pass through the light ray dispersion structure, the light rays originally transmitted towards a certain direction irradiate on the light ray dispersion structure, and the transmission direction of the light rays is deflected due to the scattering effect of the light ray dispersion structure on the light rays, so that the transmission direction of the original light rays is changed; light is through the scattering of light dispersion structure, the light type distribution that enables light type distribution curve originally and tend to lambert's body scattering distributes to the inconsistent light type of visual angle space luminance distribution that makes the emitting diode of different colours exist originally tends to the light type of lambert's body scattering after the scattering of light dispersion structure, and then improved the inconsistent problem of emitting diode visual angle space luminance distribution of different colours greatly, finally improved this display panel's visual angle colour cast phenomenon, promoted display panel's display effect.
The embodiment of the invention also provides a display device which comprises the display panel in the embodiment.
By adopting the display panel in the embodiment, the visual angle color cast phenomenon of the display device is improved, and the display effect of the display device is improved.
The display panel provided by the invention can be any product or component with a display function, such as a Mini LED panel, a Mini LED television, a Micro LED panel, a Micro LED television, a display, a mobile phone, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (17)
1. The display panel comprises a substrate and light emitting diodes with different colors arranged on the substrate, and is characterized by further comprising a light dispersion structure, wherein the light dispersion structure is located on one side, deviating from the substrate, of the light emitting diodes, and the light dispersion structure coats the light emitting diodes and can scatter light emitted by the light emitting diodes.
2. The display panel according to claim 1, wherein the light dispersing structure comprises a matrix and scattering particles, the scattering particles being dispersed in the matrix;
the substrate is light-transmitting;
the scattering particles can scatter and reflect light irradiated to the scattering particles;
and/or the scattering particles can scatter and transmit light irradiated thereon.
3. The display panel according to claim 2, wherein the substrate is made of an optically transparent adhesive material;
the scattering particles adopt nano or micron magnesium oxide particles;
and/or the scattering particles adopt nano or micron titanium dioxide particles;
and/or, the scattering particles adopt nano or micron-sized silicon dioxide particles.
4. The display panel according to claim 3, wherein the substrate has a thickness in a range of 10 to 200 μm.
5. The display panel according to claim 3, wherein the scattering particles are present in the matrix in an amount ranging from 0.1% to 20% by mass.
6. The display panel according to claim 3, wherein an orthographic shape of the base on the substrate comprises a circle, an ellipse, a rectangle, or a square;
the edge contour of the base body along the section vertical to the substrate is arc-shaped or rectangular frame-shaped close to the side opening of the substrate.
7. The display panel according to claim 6, wherein the light emitting diodes include a plurality of red light emitting diodes, a plurality of green light emitting diodes, and a plurality of blue light emitting diodes, the plurality of red light emitting diodes, the plurality of green light emitting diodes, and the plurality of blue light emitting diodes being arranged in an array;
the number of the light ray dispersing structures is multiple, and the light ray dispersing structures are distributed in a one-to-one correspondence manner with the light emitting diodes with different colors; any two adjacent light ray dispersion structures are mutually spaced;
or any two adjacent light ray dispersing structures are connected with each other.
8. The display panel according to claim 7, wherein the mass percentage of the scattering particles in the matrix in the light dispersing structure correspondingly covering the red light emitting diode is greater than the mass percentage of the scattering particles in the matrix in the light dispersing structure correspondingly covering the green light emitting diode and the blue light emitting diode.
9. The display panel of claim 8, wherein the thickness of the matrix in the light-dispersing structure correspondingly covering the red light-emitting diodes is greater than or equal to the thickness of the matrix in the light-dispersing structure correspondingly covering the green light-emitting diodes and the blue light-emitting diodes.
10. The display panel of claim 9, wherein the shape of the matrix in the light-dispersing structure correspondingly covering the red light-emitting diodes is different from the shape of the matrix in the light-dispersing structure correspondingly covering the green light-emitting diodes and the blue light-emitting diodes.
11. The display panel according to any one of claims 7 to 10, further comprising a reflection suppressing layer and a protective layer; the reflection inhibition layer and the protective layer are arranged on one side of the light ray dispersion structure, which is far away from the light emitting diode, and the reflection inhibition layer and the protective layer are sequentially distributed far away from the light ray dispersion structure;
the light transmittance of the reflection inhibition layer ranges from 1% to 10%, and the reflection inhibition layer can inhibit the light irradiated on the reflection inhibition layer from reflecting.
12. The display panel according to claim 11, wherein a surface of the reflection suppressing layer on a side close to the light ray dispersing structure is shaped to fit a surface of the light ray dispersing structure on a side away from the substrate; the surface of one side of the reflection inhibition layer, which is far away from the light ray dispersion structure, is a plane;
the thickness of a portion of the reflection-repressing layer in contact with the substrate is greater than the thickness of a portion of the reflection-repressing layer in contact with the light-dispersing structure.
13. The display panel according to claim 11, wherein the reflection suppressing layer has a shape that is fitted to a surface of a side of the light ray dispersing structure facing away from the substrate;
the reflection suppressing layer has a uniform thickness.
14. The display panel according to claim 11, further comprising a transparent adhesive layer between the reflection suppressing layer and the light scattering structure, wherein a surface of the reflection suppressing layer close to the transparent adhesive layer and a surface of the reflection suppressing layer away from the transparent adhesive layer are both flat, and the thickness of the reflection suppressing layer is uniform.
15. The display panel according to claim 11, wherein the reflection suppressing layer is made of an optically transparent adhesive material to which carbon black is added;
the protective layer is made of PET, PI or PC materials.
16. A display device characterized by comprising the display panel according to any one of claims 1 to 15.
17. A method for manufacturing a display panel according to any one of claims 1 to 15, comprising: transferring the prepared light emitting diodes with different colors to a substrate;
and preparing the light ray dispersion structure on the substrate after the steps are finished by adopting an ink-jet printing process.
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