CN114333614A - Display panel and display device - Google Patents
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- CN114333614A CN114333614A CN202011042475.9A CN202011042475A CN114333614A CN 114333614 A CN114333614 A CN 114333614A CN 202011042475 A CN202011042475 A CN 202011042475A CN 114333614 A CN114333614 A CN 114333614A
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- 239000002096 quantum dot Substances 0.000 claims abstract description 45
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 238000004806 packaging method and process Methods 0.000 claims abstract description 8
- 239000004831 Hot glue Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000003086 colorant Substances 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 21
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Abstract
The application discloses a display panel and a display device, wherein the display panel comprises a substrate and a sub-pixel array; at least part of the sub-pixels comprise light emitting diodes, reflecting walls surrounding the light emitting diodes and packaging cover plates; a first diffuse reflection structure is arranged on the top surface of the light emitting diode, and quantum dots are arranged in the space between the light emitting diode and the reflection wall and between the light emitting diode and the packaging cover plate. This application is through first diffuse reflection structure to make the directive surface the light of top reflects to the side, arouses quantum dot through side outgoing blue light and obtains the conversion light that needs the colour, and further, in emitting diode's lateral surface configuration convex lens, because the collimation of convex lens makes partly blue light outgoing direction be horizontal outgoing blue light, arouses quantum dot through horizontal outgoing blue light and obtains the conversion light that needs the colour, thereby further reduces the proportion of blue light in the conversion light, further improves the color purity of conversion light.
Description
Technical Field
The present application relates generally to the field of electronic devices, and more particularly, to a display panel and a display device.
Background
The light emitting diode (including Mirco LED and Mini LED) display technology is a display technology which takes self-luminous micron-scale LEDs as light emitting pixel units and is assembled on a driving panel to form a high-density LED array.
In the prior art, the current LED colorization technology is a red, green and blue three-color LED chip scheme, and a blue LED + QDs (Quantum Dots) method only needs to transfer monochromatic LEDs in batches, and excites the Quantum Dots through blue light to obtain converted light with a required color, but unconverted blue light is emitted together with the converted light, resulting in color cast of pixels, low color purity, and failure to meet the full-color display requirements.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a substrate capable of reducing blue light emitted with converted light and improving color purity of the converted light.
In a first aspect, an embodiment of the present application provides a display panel, including a substrate and a sub-pixel array; at least part of the sub-pixels comprise light emitting diodes, reflecting walls surrounding the light emitting diodes and packaging cover plates; a first diffuse reflection structure is arranged on the top surface of the light emitting diode, and quantum dots are arranged in the space between the light emitting diode and the reflection wall and between the light emitting diode and the packaging cover plate.
Optionally, the sub-pixel further includes a convex lens, and the convex lens is disposed around the light emitting diode.
Optionally, the first diffuse reflection structure includes two layers stacked in sequence.
Optionally, the two layers stacked in sequence include an upper layer of a concave-convex structure formed by roughening the top surface and a lower layer of a reflective layer disposed on the surface of the concave-convex structure.
Optionally, the reflective wall has a second diffuse reflection structure around the substrate surface within the region.
Optionally, the second diffuse reflection structure is a trapezoid or a triangular groove, and the trapezoid or the triangular groove is configured with a reflection layer.
Optionally, the light emitted by the light emitting diode is directed into the path of the convex lens, and the refraction angle is larger than the incidence angle.
Optionally, the convex lens is made of a transparent hot melt adhesive material.
Optionally, the transparent hot melt adhesive material is an epoxy resin.
Optionally, the at least part of the sub-pixels are green sub-pixels or red sub-pixels.
In a second aspect, the present application provides a display device, which includes the display panel described above.
Has the advantages that:
according to the display panel, the blue light emitted to the top surface is reflected to the side surface through the first diffuse reflection structure on the top surface of the light emitting diode, the blue light is emitted from the side surface to excite the quantum dots to obtain converted light with required color, the converted light is emitted from the packaging plate, the proportion of the blue light in the converted light is reduced, and the color purity of the converted light is improved; this application can also be further through emitting diode's lateral surface configuration convex lens, because convex lens's collimation makes partly blue light outgoing direction be horizontal outgoing blue light, arouses the conversion light that quantum dot obtained needs colour through horizontal outgoing blue light, can further reduce the proportion of blue light in the conversion light, further improves the colour purity of conversion light.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic diagram of conversion of blue light excited quantum dots into other colors of light in the related art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present application;
fig. 3 is a schematic diagram illustrating an optical path of blue light emitted from a light emitting diode in a substrate according to an embodiment of the present application, the blue light being refracted from the light emitting diode to a convex lens;
FIG. 4 is a schematic diagram of another substrate according to an embodiment of the present disclosure;
in the figure:
10: blue light 20, quantum dots 30, converted light 40, reflective walls 50, light emitting diode 60, substrate 70: the package board 101: doped blue light 501: first diffuse reflection structure 502 convex lens 601: second diffuse reflection structure
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for the convenience of description, only a part related to the present invention is shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 shows a schematic diagram of conversion of blue light excited quantum dots into other colors of light in the related art;
in the related art, as shown in fig. 1, a light emitting diode emits blue light 10 to excite a quantum dot 20, so as to obtain converted light 30, and unconverted blue light 101 will exit with the converted light 30, so that the converted light 30 is doped with the blue light 101, and the conversion rate of the blue light 10 is relatively low, which results in a problem of low color purity. Wherein, the light emitting diode is a micro light emitting diode, Quantum Dot (QDs).
Fig. 2 is a schematic structural diagram of a light emitting diode display panel to which the present embodiment can be applied, and referring to fig. 1, the display panel includes:
a substrate 60 and a sub-pixel array; wherein at least part of the sub-pixels comprise a light emitting diode 50, a reflective wall 40 surrounding the light emitting diode, and an encapsulation cover plate 70; the top surface of the light emitting diode 50 is provided with a first diffuse reflection structure 501, and the space between the light emitting diode 50 and the reflective wall 40 and the encapsulation cover 70 is provided with quantum dots 20.
The light emitting diode 50 may be a forward mounting structure, a vertical structure, or a flip-chip structure. Preferably in a flip-chip configuration.
Specifically, the sub-pixels may emit light of different colors, at least part of the sub-pixels of the display panel are green light sub-pixels or red light sub-pixels, or at least part of the sub-pixels are green light sub-pixels and red light sub-pixels, the quantum dots 20 of the green light sub-pixels are green light quantum dots, the quantum dots 20 of the red light sub-pixels are red light quantum dots, the reflective wall 40, the light emitting diode 50, and the substrate 60 form an accommodating space, the quantum dots 20 are configured in the accommodating space, the first diffuse reflection structure includes two layers stacked in sequence, specifically, the two layers stacked in sequence include a concave-convex structure formed after the top surface is roughened and a reflective layer configured on the surface of the concave-convex structure. The reflection layer on the surface of the concave-convex structure 501 promotes the blue light emitted to the top surface direction to be reflected to the side surface, the blue light emitted from the side surface excites the quantum dots to emit required conversion light, the unconverted blue light is reflected by the reflection wall 40 and can also excite the quantum dots 20, the blue light excites the red light quantum dots to emit conversion light in red, and the blue light excites the green light quantum dots to emit conversion light in green.
In the display panel of this embodiment, the first diffuse reflection structure reflects the blue light 10 emitted to the top surface to the side surface, and the blue light 10 emitted from the side surface excites the quantum dots 20 to obtain the converted light with a desired color, so as to reduce the doping ratio of the blue light 10 in the converted light 30, improve the conversion efficiency from the blue light 10 to the converted light 30, and achieve the purpose of improving the color purity of the converted light.
In another embodiment, the sub-pixel further includes a convex lens 502, the convex lens 502 is disposed around the light emitting diode 50, and due to the collimation effect of the convex lens 502, a part of the blue light 10 reflected to the side surface passes through the convex lens 502 to be parallel blue light, and the parallel blue light can generate a better excitation effect on the quantum dot 20 to emit the required converted light 30.
In further embodiments, the reflective wall 40 has a second diffuse reflection structure 601 around the surface of the substrate 60 within the region;
specifically, the second diffuse reflection structure 601 may be a trapezoid or a triangular groove, and a reflection layer is disposed on an outer surface of the trapezoid or the triangular groove. After the quantum dots are excited by the blue light, the converted light is reflected towards the substrate 60 with a probability, and the converted light is reflected upwards through the reflection layer of the trapezoid or triangular groove, so that the emergence rate of the converted light is increased.
In another embodiment, the convex lens 502 is made of a transparent hot melt adhesive material, preferably a hot melt adhesive material with a refractive index between 1.5 and 1.7, which may be an epoxy resin, for example.
FIG. 3 is a schematic diagram illustrating a light path of blue light emitted from a light emitting diode refracted to a lens from the light emitting diode in a substrate according to an embodiment of the present disclosure; as shown in fig. 3, the blue light 10 is emitted into the optical path of the convex lens 502, and the refraction angle is larger than the incidence angle.
According to the law of reflection: n is1*sinθ1＝n2*sinθ2，
Wherein n is1Is the refractive index of the light emitting diode, n2Is the refractive index of the convex lens, theta1Is the angle of incidence, θ2Is the angle of refraction;
the critical angle θ of total reflection of the led has the following relationship:
sinθ＝n2*sinθ2/n1
therefore, the convex lens 502 is configured to increase the critical angle θ of total reflection of the led 50, and for example, the convex lens 502 is made of epoxy resin, according to the formula of total reflection light extraction: eta ═ n1/n2)2，η1＝(nair/nLED)2＝0.087,η2＝(nEP/nLED)2＝0.22
Wherein n isairIs the refractive index of air, nLEDIs the refractive index of the LED, nEPIs the refractive index of the epoxy.
The light extraction efficiency eta 2 is increased by about 2.56 times, so that the proportion of blue light emitted is improved by adopting the convex lens made of epoxy resin.
The embodiment of the application provides a manufacturing method of a display panel, which comprises the following steps:
s20, roughening the top surface of the LED and configuring a reflecting layer; blue light directed to a top surface is reflected by a reflective layer of the top surface to promote lateral reflection of the blue light.
S40, transferring and binding the light emitting diode with the substrate to form connection with a circuit in the substrate, and then manufacturing a reflecting wall surrounding the light emitting diode on the substrate, wherein the reflecting wall is provided with a reflecting layer;
wherein, the transfer adopts a mass transfer mode.
S60, disposing the quantum dots 20 in the space between the light emitting diode and the reflective wall, and encapsulating with an encapsulating plate.
Specifically, Quantum Dots 20 (QDs) that can convert light of a desired color may be disposed to the corresponding sub-pixel regions by a coating or spraying method.
For the red sub-pixel, red quantum dots 20 are arranged, and for the green sub-pixel, green quantum dots 20 are arranged.
According to the display panel obtained by the manufacturing method, the top surface of the light emitting diode is roughened and then is provided with the reflecting layer, the reflecting layer promotes light rays emitted to the top surface direction to be reflected to the side surface so as to excite the quantum dots to emit required converted light, and unconverted blue light rays can be excited after being reflected by the reflecting wall so as to obtain the required converted light, so that the conversion efficiency of the light is improved, the proportion of the blue light rays in the converted light rays is reduced, and the purpose of improving the color purity of the converted light is achieved.
In further embodiments, the manufacturing method further comprises: s201, configuring a convex lens on the side surface of the light-emitting diode; the convex lens can be a plano-convex lens, the plane of the plano-convex lens is attached to the outer side face of the light-emitting diode, and the convex lens can be manufactured on the outer side wall of the light-emitting diode through processes such as etching and the like.
Because convex lens's collimation effect, partly blue light to the side reflection passes through be parallel blue light behind the convex lens, parallel blue light can arouse quantum dot, and the parallel blue light of unconverted can arouse the quantum dot of sub-pixel district through reflection wall transmission many times, realizes that the blue light utilizes many times that the quantum dot in sub-pixel district arouses to convert the conversion light that needs the colour, can further improve the conversion efficiency of blue light to conversion light, make the blue light further reduce in the proportion of emergent light, further improve the color purity of conversion light.
In another embodiment, the manufacturing method further includes a step of disposing a second diffuse reflection structure on the surface of the substrate within the reflective wall surrounding region S401.
Specifically, the second diffuse reflection structure 601 may be a trapezoidal or triangular groove whose surface is configured with a reflection layer. After the quantum dots 20 are excited by the blue light 10, the converted light 30 is reflected with a probability in the direction of the substrate 60, and the converted light is reflected upward by the reflective layer of the trapezoidal or triangular groove to increase the emission rate of the converted light.
The embodiment of the application also provides a display device which comprises the display panel.
The present application is explained below as an embodiment of the present application, and the display panel includes: the light emitting diode comprises a substrate 60 and an array consisting of blue light sub-pixels, green light sub-pixels and red light sub-pixels, wherein each of the red light sub-pixels and the green light sub-pixels comprises a light emitting diode 50, a reflecting wall 40 and a packaging plate 70, the top surface of the light emitting diode 50 is roughened and then provided with a reflecting layer, so that the blue light emitted to the top surface is reflected to the side surface of the light emitting diode 50, the outer side of the light emitting diode 50 is provided with a planoconvex lens 502 made of epoxy resin, the inner surface of the substrate 60 is provided with a trapezoidal groove, and the surface of the groove is provided with the reflecting layer. Wherein quantum dots 20 are arranged in the space between the light emitting diode 50, the reflective wall 40 and the package plate 70. The green sub-pixel is configured with green quantum dots 20, the red sub-pixel is configured with red quantum dots, and the blue sub-pixel can adopt a structure in the prior art or a structure of the present application.
In the display panel of this embodiment, the top surface of the light emitting diode 50 is roughened and then configured with a reflective layer, the reflective layer promotes the blue light emitted toward the top surface to be reflected toward the side surface of the light emitting diode 50, the outer side surface of the light emitting diode 50 is configured with the plano-convex lens 502, due to the collimation effect of the plano-convex lens 502, a part of the blue light reflected toward the side surface of the light emitting diode can emit parallel blue light after passing through the convex lens 502, the parallel blue light excites the quantum dots 20 to form the converted light 30 to be emitted from the package plate 70, the unconverted parallel blue light can excite the green quantum dots of the green light sub-pixel and the red light quantum dots of the red light sub-image for multiple times through the reflection of the reflective wall 40, so as to be converted into the required green light and red light, and the conversion efficiency from the blue light to the green light and the conversion efficiency from the blue light to the red light are improved, realizing full-color micro-display effect.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. The display panel is characterized by comprising a substrate and a sub-pixel array; at least part of the sub-pixels comprise light emitting diodes, reflecting walls surrounding the light emitting diodes and packaging cover plates; a first diffuse reflection structure is arranged on the top surface of the light emitting diode, and quantum dots are arranged in the space between the light emitting diode and the reflection wall and between the light emitting diode and the packaging cover plate.
2. The display panel of claim 1, wherein the sub-pixels further comprise convex lenses, and the convex lenses are arranged around the light emitting diodes.
3. The display panel according to claim 1, wherein the first diffuse reflection structure comprises two layers stacked in this order.
4. The display panel according to claim 3, wherein the two layers stacked in this order include a textured structure formed by roughening the top surface and a reflective layer disposed on the textured structure.
5. The display panel of claim 1, wherein the reflective wall has a second diffuse reflective structure around a surface of the substrate within the region.
6. The display panel according to claim 5, wherein the second diffuse reflection structure is a trapezoidal or triangular groove, and a reflective layer is disposed on a surface of the trapezoidal or triangular groove.
7. The display panel of claim 2 wherein the light emitted by the light emitting diode is directed into the path of the convex lens with an angle of refraction greater than the angle of incidence.
8. The display panel according to any of claims 2-7, wherein the convex lenses are made of a transparent hot melt adhesive material.
9. A display panel as claimed in any one of the claims 2-7 characterized in that the light emitted by the sub-pixels is of different colors.
10. A display device characterized in that it comprises a display panel as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011042475.9A CN114333614A (en) | 2020-09-28 | 2020-09-28 | Display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011042475.9A CN114333614A (en) | 2020-09-28 | 2020-09-28 | Display panel and display device |
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| CN114333614A true CN114333614A (en) | 2022-04-12 |
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| CN202011042475.9A Withdrawn CN114333614A (en) | 2020-09-28 | 2020-09-28 | Display panel and display device |
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Application publication date: 20220412 |