CN112786763B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN112786763B CN112786763B CN201911060324.3A CN201911060324A CN112786763B CN 112786763 B CN112786763 B CN 112786763B CN 201911060324 A CN201911060324 A CN 201911060324A CN 112786763 B CN112786763 B CN 112786763B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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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- 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 with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/50—Wavelength conversion elements
- H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
Abstract
The embodiment of the invention relates to the technical field of semiconductor display, and discloses a display panel and a display device, wherein the display panel comprises: the light-emitting diode comprises a first substrate, a plurality of light-emitting units, a light-shielding layer and a second substrate which are sequentially stacked; a plurality of first holes and a plurality of second holes are formed in one side, facing the light emitting unit, of the light shielding layer; further comprises: the color conversion layer is arranged in the first hole, a scattering structure is arranged at the position, opposite to the second hole, of the second substrate, and each light-emitting unit corresponds to one first hole or one second hole. The display panel and the display device provided by the invention can improve the luminous effect of the display panel.
Description
Technical Field
The embodiment of the invention relates to the technical field of semiconductor display, in particular to a display panel and a display device.
Background
The conventional liquid crystal display (Liquid Crystal Display, LCD) panels, organic light emitting diode display (Organic Light Emitting Display, OLED) panels, and flat display panels using light emitting diode (Light Emitting Diode, LED) devices have been widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, because of their advantages such as high image quality, power saving, thin body, and wide application range. The display panel may implement a display supporting color patterns through various colorization schemes. However, the quality of the existing display panel is to be improved.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a display panel and a display device capable of improving a light emitting effect of the display panel.
In order to solve the above technical problems, an embodiment of the present invention provides a display panel, including:
the light-emitting diode comprises a first substrate, a plurality of light-emitting units, a light-shielding layer and a second substrate which are sequentially stacked; a plurality of first holes and a plurality of second holes are formed in one side, facing the light emitting unit, of the light shielding layer; further comprises: the color conversion layer is arranged in the first hole, a scattering structure is arranged at the position, opposite to the second hole, of the second substrate, and each light-emitting unit corresponds to one first hole or one second hole.
In addition, the second substrate comprises a first surface close to the second hole, and a second surface opposite to the first surface, and the scattering structure is arranged on the first surface and/or the second surface. Through the arrangement of the structure, the blue light emitted by the light emitting unit can be scattered through the scattering structure, so that the scattering degree of the blue light is increased, and the light emitting effect of the display panel is improved.
In addition, the scattering structure comprises a first scattering structure arranged on the first surface and/or a second scattering structure arranged on the second surface, the first scattering structure comprising at least one first groove extending from the first surface towards the second surface and/or at least one first protrusion extending from the first surface in a direction away from the second surface; the second scattering structure comprises at least one second groove extending from the second surface towards the first surface and/or at least one second protrusion extending from the second surface in a direction away from the first surface. Through the arrangement of the structure, blue light emitted by the light emitting unit can be scattered through the first scattering structure and the second scattering structure, so that the scattering degree of the blue light is increased, and the light emitting effect of the display panel is improved.
In addition, the first scattering structure comprises a plurality of the first grooves, and the second scattering structure comprises a plurality of the second grooves; the interval between the adjacent first grooves is 5 micrometers to 50 micrometers, and the interval between the adjacent second grooves is 5 micrometers to 50 micrometers. By the arrangement of the structure, the scattering degree of blue light can be further increased, and therefore the light emitting effect of the display panel is further improved.
In addition, the first groove and the second groove have a groove depth of 0.5 micrometers to 5 micrometers. By providing the first groove having such a groove depth, the scattering degree of blue light can be increased, and the light emitting effect of the display panel can be improved, while the stability of the display panel can be ensured.
In addition, the cross-sectional shape of the first groove and the second groove in the thickness direction of the display panel is one or more of square, semicircular, triangular, and trapezoidal. By the mode, the shape types of the first groove and the second groove are increased, so that the scattering degree of blue light can be increased, and meanwhile, the first groove and the second groove with different shapes can be designed according to actual requirements.
In addition, the light-emitting device further comprises a heat conduction layer, wherein the heat conduction layer covers the light-emitting unit; preferably, the thickness of the heat conductive layer is 0.5 to 5 micrometers thicker than the thickness of the light emitting unit. Because the light-emitting unit can generate heat when emitting light, the heat generated by the light-emitting unit can be effectively conducted and dissipated by arranging the heat conducting layer around the light-emitting unit, so that the service life and the display effect of the display panel are ensured.
In addition, the material of the heat conducting layer comprises a polymer matrix and heat conducting nano particles; preferably, the polymer matrix comprises polymethacrylate or polysiloxane; preferably, the thermally conductive nanoparticle comprises nano aluminum oxide, nano boron nitride, nano silver wire, gold nanospheres, carbon nanotubes or graphene. By the mode, the heat conduction layer has high light transmittance, so that the optical performance of the display panel is ensured not to be affected by the heat conduction layer, and the display effect of the display device manufactured in the subsequent process is improved.
In addition, the semiconductor device further comprises a planarization layer, wherein the planarization layer fills the second hole, and the refractive index of the planarization layer is smaller than that of the second substrate; preferably, the material of the planarization layer comprises polymethacrylate, polysiloxane and epoxy resin. Since light is totally reflected back into the original medium when being emitted from the optically dense medium (i.e. the light has a large refractive index in the medium) to the interface of the optically sparse medium (i.e. the light has a small refractive index in the medium), in order to avoid the occurrence of the above-mentioned total reflection phenomenon, the refractive index of the planarization layer is set smaller than that of the second substrate, so that the light emitted from the light emitting unit is emitted from the optically dense medium (planarization layer) to the optically dense medium (second substrate), and thus the light emitted into the second substrate is not reflected back to the planarization layer, thereby increasing the light-emitting efficiency.
Correspondingly, the embodiment of the invention also provides a display device which comprises the display panel.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:
by arranging the light shielding layer, the light shielding layer is provided with a plurality of first holes and second holes, each light emitting unit corresponds to one first hole or one second hole, and the color conversion layer is arranged in the first hole, so that on one hand, blue light can be converted into red light and green light through the color conversion layer in the first hole by virtue of the arrangement of the structure, and on the other hand, the second hole is not provided with the color conversion layer, so that blue light can be directly emitted, thereby realizing the color conversion of light emitting units, and on the other hand, the light shielding layer can effectively avoid light crosstalk between adjacent light emitting units, thereby improving the light emitting effect of the display panel; because blue light is directly provided by the light-emitting unit, compared with red light and green light, the scattering degree of the blue light is lower, and further, the scattering structure is arranged at the position, opposite to the second hole, of the second substrate, so that the blue light emitted by the light-emitting unit can be scattered through the scattering structure, the scattering degree of the blue light is increased, namely the light-emitting angle is increased, the phenomenon of reddening when the side surface of the display panel is observed is effectively avoided, and the light-emitting effect of the display panel is further improved.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic structural view of a display panel according to a first embodiment of the present invention;
fig. 2 is another schematic structural view of a display panel according to a first embodiment of the present invention;
fig. 3 is a schematic view showing another structure of a display panel according to the first embodiment of the present invention;
fig. 4 is a schematic structural view of a display panel according to a second embodiment of the present invention;
fig. 5 is another schematic structural view of a display panel according to a second embodiment of the present invention;
fig. 6 is a schematic view of still another structure of a display panel according to a second embodiment of the present invention;
fig. 7 is a schematic structural view of a display panel according to a third embodiment of the present invention;
fig. 8 is a flowchart of a method for manufacturing a display panel according to a fifth embodiment of the present invention.
Detailed Description
Currently, blue light in a display panel is scattered to a lower degree than red and green light, resulting in a smaller blue light exit angle, and when viewed from the side of the display panel, the display screen is seen to be reddish, i.e., a "reddish phenomenon".
In view of the above problems, the present invention provides a display panel, a display device, and a method for manufacturing a display panel, in which a scattering pattern is added to a blue subpixel, so that the scattering degree of blue light can be effectively increased, thereby avoiding "reddening phenomenon" and ensuring display quality.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present invention, numerous technical details have been set forth in order to provide a better understanding of the present invention. However, the claimed invention may be practiced without these specific details and with various changes and modifications based on the following embodiments.
A first embodiment of the present invention relates to a display panel 100, with a specific structure as shown in fig. 1, including:
a first substrate 1, a plurality of light emitting units 2, a light shielding layer 3, and a second substrate 4, which are stacked in this order; the light shielding layer 3 is provided with a plurality of first holes 31 and a plurality of second holes 32 on a side facing the light emitting unit 2; further comprises: the color conversion layer 5, the color conversion layer 5 is disposed in the first hole 31, and the second substrate 4 has a scattering structure 40 at a position opposite to the second hole 32, and each light emitting unit 2 corresponds to one of the first hole 31 or one of the second holes 32.
In the embodiment of the present invention, compared with the prior art, by providing the light shielding layer 3, the light shielding layer 3 has a plurality of first holes 31 and a plurality of second holes 32, each light emitting unit 2 corresponds to one first hole 31 or one second hole 32, and the color conversion layer is provided in the first hole 31, on the one hand, since the light emitting unit 2 usually adopts a blue LED chip, but not limited to the LED chip, and may also include a micro chip, an OLED chip, and the like, and may be limited according to practical situations. The arrangement of the structure can enable blue light to be converted into red light and green light through the color conversion layer 5 in the first hole 31, and the second hole 32 is not provided with the color conversion layer 5, so that the blue light can be directly emitted, the color conversion of the light emitting units 2 is realized, on the other hand, the light shielding layer 3 can effectively avoid the light crosstalk between the adjacent light emitting units 2, and the light emitting effect of the display panel 100 is improved; because the blue light is directly provided by the light emitting unit 2, compared with red light and green light, the scattering degree of the blue light is lower, and the blue light emitted by the light emitting unit 2 can be scattered by the scattering structure 40 by arranging the scattering structure 40 at the position where the second substrate 4 is opposite to the second hole 32, so that the scattering degree of the blue light is increased, that is, the light emitting angle is increased, the occurrence of the reddening phenomenon is effectively avoided, and the light emitting effect of the display panel 100 is further improved.
Specifically, the light shielding layer 3 includes a light shielding layer body 33, a plurality of first holes 31 and a plurality of second holes 32, and the light shielding layer body 33 is disposed between the adjacent light emitting units 2, so that light crosstalk between the adjacent light emitting units 2 can be effectively avoided, thereby improving the light emitting effect of the display panel 100.
In the present embodiment, the second substrate 4 includes a first surface 41 adjacent to the second hole 32, and a second surface 42 opposite to the first surface 41, and the scattering structure 40 is disposed on the first surface 41.
It is understood that the second substrate 4 may be a glass substrate, CPI (transparent polyimide), PI (polyimide), PET (high temperature polyester), PEN (polyethylene naphthalate), or the like. It should be noted that, since the light emitted from the light emitting unit 2 passes through the second substrate 4, the transparent material is used to prepare the second substrate 4, so as to ensure that the optical performance of the display panel 100 is not affected by the second substrate 4, and the display effect of the display device manufactured in the subsequent process is improved.
Specifically, the color conversion layer 5 includes transparent photoresist and quantum dot material, the quantum dot material includes cadmium sulfide/cadmium selenide containing cadmium, indium phosphide containing no cadmium, and the like, and further, light scattering particles, such as nano particles of titanium dioxide, are doped in the color conversion layer 5, so that when light emitted from the light emitting unit 2 passes through the color conversion layer 5, the quantum dot material can perform color conversion on the light, and the light scattering particles can scatter the light, so that the display panel 100 can emit red light and green light, and meanwhile, the scattering degree of the red light and the green light is increased.
The implementation details of the display panel 100 of the present embodiment are specifically described below, and the following description is provided only for easy understanding, and is not necessary for implementing the present embodiment.
In this embodiment, as shown in fig. 1, the scattering structure 40 includes at least one groove extending from the first surface 41 to the second surface 42, and the at least one groove extending from the first surface 41 to the second surface 42 constitutes a first scattering structure. By the arrangement of such a structure, the blue light emitted from the light emitting unit 2 can be scattered via the grooves, so that the scattering degree of the blue light becomes large, and the light emitting effect of the display panel 100 is improved.
It is worth mentioning that the number of grooves is plural, and the interval between adjacent grooves is 5 micrometers to 50 micrometers; preferably, the grooves have a groove depth of 0.5 to 5 microns. By providing a plurality of grooves, it can be ensured that blue light emitted from the light emitting unit 2 can be scattered through the grooves, thereby further improving the light emitting effect of the display panel 100. It will be appreciated that the number of grooves is not particularly limited in this embodiment, and those skilled in the art can set different numbers of grooves according to actual requirements. It can be understood that the closer spacing of the grooves increases the difficulty of the manufacturing process of the display panel 100, and the longer spacing of the grooves is likely to cause poor scattering effect of blue light, and by providing the grooves with such spacing (5 micrometers to 50 micrometers), the scattering degree of blue light is ensured to be increased, the light emitting effect of the display panel is improved, and meanwhile, the difficulty of the manufacturing process of the display panel 100 is not increased; in addition, since the depth of the groove is shallow, which easily causes poor scattering effect of blue light, the depth of the groove is deep, which easily causes poor structural stability of the second substrate 4, and thus the stability of the display panel 100 is not high, by providing the first groove with such a depth (0.5 to 5 micrometers), the scattering degree of blue light can be increased, the light emitting effect of the display panel can be improved, and at the same time, the stability of the display panel 100 can be ensured.
Specifically, the cross-sectional shape of the groove in the thickness direction of the display panel 100 is one or several of square, semicircular, triangular and trapezoid, it is to be understood that the cross-sectional shape of the groove in the thickness direction of the display panel 100 in fig. 1 is square, but the cross-sectional shape of the groove in the thickness direction of the display panel 100 is not limited thereto, and may be any other shape, and the cross-sectional shape of the groove in the thickness direction of the display panel 100 need not be completely uniform, such as the cross-sectional shape may be square and semicircular alternately, etc., and the present embodiment does not specifically limit the cross-sectional shape of the groove in the thickness direction of the display panel 100, the number of shapes of the first grooves provided on the second substrate 4, etc.
In another possible embodiment, as shown in fig. 2, the scattering structure 40 comprises at least one protrusion extending from the first surface 41 in a direction away from the second surface 42, the at least one protrusion extending from the first surface 41 in a direction away from the second surface 42 constituting the first scattering structure. By the arrangement of such a structure, the blue light emitted from the light emitting unit 2 can be scattered by the protrusions, so that the scattering degree of the blue light becomes large, and the light emitting effect of the display panel 100 is improved. It will be appreciated that the spacing between adjacent projections is from 5 microns to 50 microns; preferably, the raised bumps are spaced from 0.5 microns to 5 microns from the first surface 41. In addition, the present embodiment is also not particularly limited to the specific shape of the projections, the number of projections, and the number of shapes of projections provided on the second substrate 4. It can be understood that the closer spacing of the protrusions increases the difficulty of the process of the display panel 100, and the longer spacing of the protrusions easily causes poor scattering effect of blue light, and by providing the protrusions with such spacing (5 micrometers to 50 micrometers), the scattering degree of blue light is ensured to be increased, the light emitting effect of the display panel is improved, and meanwhile, the difficulty of the process of the display panel 100 is not increased; in addition, since the distance from the protruding bump to the first surface 41 is relatively short, which easily results in poor scattering effect of blue light, the distance from the protruding bump to the first surface 41 is relatively long, which increases the thickness of the second substrate 4, and is not beneficial to the design of the display panel 100 for being light and thin, and by providing the protruding bump with such a distance (0.5 to 5 micrometers), the scattering degree of blue light can be increased, the light emitting effect of the display panel can be improved, and at the same time, the design of the display panel 100 for being light and thin can be facilitated.
In another possible embodiment, as shown in fig. 3, the scattering structure 40 includes at least one groove extending from the first surface 41 toward the second surface 42 and at least one protrusion extending from the first surface 41 toward the direction away from the second surface 42, and the at least one groove extending from the first surface 41 toward the second surface 42 and the at least one protrusion extending from the first surface 41 toward the direction away from the second surface 42 form the first scattering structure, that is, the first surface 41 is provided with both the grooves and the protrusions, and the protrusions and the grooves shown in fig. 3 are alternately arranged with each other and are square, but it will be understood by those skilled in the art that the above-mentioned arrangement of the protrusions and the grooves and the shapes of the protrusions and the grooves are merely an example, and that two protrusions and the like may be provided between adjacent grooves.
It should be noted that the display panel 100 further includes a heat conductive layer 6, and the heat conductive layer 6 covers the light emitting unit 2. Since the light emitting unit 2 generates heat when emitting light, the heat generated by the light emitting unit 2 can be effectively conducted and dissipated by providing the heat conducting layer 6 around the light emitting unit 2, thereby ensuring the life and display effect of the display panel 100. In addition, as shown in fig. 1 to 3, the heat conducting layer 6 may also cover the entire first substrate 1, so as to achieve a better heat conducting effect. It can be understood that the heat conducting layer 6 can also have a planarization effect, which is beneficial to the alignment and lamination of the light shielding layer 3 and the light emitting unit 2. Preferably, as shown in fig. 1, the thickness direction of the heat conductive layer 6 is the X direction, and the thickness of the heat conductive layer 6 is 0.5 to 5 micrometers thicker than the thickness of the light emitting unit 2. The thinner heat conducting layer has poor heat dissipation effect, and the thicker heat conducting layer increases the thickness of the display panel 100, which is not beneficial to the light and thin design of the display panel 100, and by providing the heat conducting layer 6 with such thickness (0.5 to 5 micrometers thicker than the light emitting unit 2), the light and thin design of the display panel 100 can be facilitated while ensuring the heat generated by the light emitting unit 2 to be conducted and dissipated.
Specifically, the material of the heat conducting layer 6 includes a polymer matrix and heat conducting nanoparticles; preferably, the polymer matrix comprises polymethacrylate or polysiloxane; preferably, the heat conducting nano particles comprise nano aluminum oxide, nano boron nitride, nano silver wires, gold nanospheres, carbon nanotubes and graphene. It should be noted that the polymer matrix made of polymethacrylate or polysiloxane has high light transmittance (light transmittance is more than 90%), because part of the heat conductive layer 6 is disposed on the light emitting unit 2, and the heat conductive layer 6 is formed by preparing the polymer matrix using a high light transmittance material, so as to ensure that the optical performance of the display panel 100 is not affected by the heat conductive layer 6, and the display effect of the display device manufactured in the subsequent process is improved; the heat conducting nano particles prepared by one or more of nano aluminum oxide, nano boron nitride, nano silver wire, gold nanospheres, carbon nanotubes and graphene have high heat conductivity (the heat conductivity is greater than or equal to 50W/(m.k)), so as to further improve the heat conducting effect of the heat conducting layer 6.
It should be noted that the display panel 100 further includes a planarization layer 7, the planarization layer 7 fills the second hole 32, and the refractive index of the planarization layer 7 is smaller than the refractive index of the second substrate 4. Since light is totally reflected back into the original medium when it is emitted from the optically dense medium (i.e., the light has a large refractive index in the medium) to the interface of the optically dense medium (i.e., the light has a small refractive index in the medium), in order to avoid the occurrence of the above-mentioned total reflection phenomenon, the refractive index of the planarization layer 7 is set smaller than that of the second substrate 4, so that the light emitted from the light emitting unit 2 is emitted from the optically dense medium (the planarization layer 7) to the optically dense medium (the second substrate 4), and thus the light emitted into the second substrate 4 is not reflected back to the planarization layer 7, thereby increasing the light-emitting efficiency. Specifically, the material of the planarization layer 7 is a transparent organic polymer, such as polymethacrylate, polysiloxane, epoxy resin, etc., and since the planarization layer 7 is located above the light emitting unit 2, the optical performance of the display panel 100 can be ensured not to be affected by the planarization layer 7 by preparing the planarization layer 7 using a transparent material, and the display effect of the display device manufactured in the subsequent process is improved.
Preferably, the planarization layer 7 may further cover the light shielding layer 3 and the color conversion layer 5, so as to play a role of isolating water and oxygen while being convenient for being aligned and attached to the light emitting unit 2, prevent the performance of the light shielding layer 3 and the color conversion layer 5 from being affected by water and oxygen in air, and improve the reliability of the display panel 100. In addition, light scattering particles (such as titanium dioxide) may be added to the planarization layer 7 disposed in the second hole 32, so that the scattering degree of blue light is further improved, thereby further improving the light emitting effect of the display panel 100. It should be noted that, when the thickness of the color conversion layer 5 is smaller than or equal to the thickness of the light shielding layer 3 to avoid the poor capability of the light shielding layer 3 to prevent the adjacent light emitting units 2 from generating light crosstalk, and when the thickness of the color conversion layer 5 is smaller than the light shielding layer 3, if the planarization layer 7 covers the light shielding layer 3 and the color conversion layer 5 at this time, as shown in fig. 1 to 3, a part of the planarization layer 7 fills the first hole 31 and the second hole 32. It should be noted that, in the present embodiment, the thickness direction of the planarization layer 7 is the Y direction, and the thickness of the planarization layer 7 (from the scattering structure) may be greater than the thickness of the light shielding layer 3, so as to further improve the capability of the display panel 100 for isolating water and oxygen, and further avoid the performance of the light shielding layer 3 and the color conversion layer 5 from being affected by water and oxygen in the air.
The second embodiment of the present invention relates to a display panel 200, which is substantially the same as the first embodiment, and differs mainly in that: the scattering structure 40 comprises at least one groove extending from the second surface 42 towards the first surface 41 and/or at least one protrusion extending from the second surface 42 towards a direction away from the first surface 41. Specifically, as shown in fig. 4, the scattering structure 40 includes at least one groove extending from the second surface 42 toward the first surface 41, and the at least one groove extending from the second surface 42 toward the first surface 41 constitutes a second scattering structure. By the arrangement of such a structure, the blue light emitted from the light emitting unit 2 can be scattered via the grooves, so that the scattering degree of the blue light becomes large, and the light emitting effect of the display panel 200 is improved.
It is worth mentioning that the number of grooves is plural, and the interval between adjacent grooves is 5 micrometers to 50 micrometers; preferably, the grooves have a groove depth of 0.5 to 5 microns. By providing a plurality of grooves, it can be ensured that blue light emitted from the light emitting unit 2 can be scattered through the second grooves, thereby further improving the light emitting effect of the display panel 100. It is to be understood that the number of the second grooves is not particularly limited in this embodiment, and those skilled in the art may set different numbers of the second grooves according to actual needs.
Specifically, the cross-sectional shape of the groove in the thickness direction of the display panel 100 is one or several of square, semicircular, triangular and trapezoid, and it is understood that the cross-sectional shape of the groove in the thickness direction of the display panel 100 in fig. 4 is semicircular, but the shape of the groove is not limited thereto, and may be any other shape, and the cross-sectional shape of the groove in the thickness direction of the display panel 100 need not be completely uniform, for example, the cross-sectional shape may be square and semicircular alternately, and the number of shapes of the second grooves provided on the second substrate 4 is not specifically limited in this embodiment.
In another possible embodiment, as shown in fig. 5, the scattering structure 40 comprises at least one protrusion extending from the second surface 42 in a direction away from the first surface 41, the at least one protrusion extending from the second surface 42 in a direction away from the first surface 41 constituting the second scattering structure. By the arrangement of such a structure, the blue light emitted from the light emitting unit 2 can be scattered by the protrusions, so that the scattering degree of the blue light becomes large, and the light emitting effect of the display panel 100 is improved. It will be appreciated that the spacing between adjacent projections is from 5 microns to 50 microns; preferably, the raised bumps are spaced from 0.5 microns to 5 microns from the second surface 42. In addition, the present embodiment is also not particularly limited to the specific shape of the projections, the number of projections, and the number of shapes of projections provided on the second substrate 4. It can be understood that the closer spacing of the protrusions increases the difficulty of the process of the display panel 100, and the longer spacing of the protrusions easily causes poor scattering effect of blue light, and by providing the protrusions with such spacing (5 micrometers to 50 micrometers), the scattering degree of blue light is ensured to be increased, the light emitting effect of the display panel is improved, and meanwhile, the difficulty of the process of the display panel 100 is not increased; in addition, since the distance from the convex protruding point to the second surface 42 is relatively short, which easily results in poor scattering effect of blue light, the distance from the convex protruding point to the first surface 42 is relatively long, which increases the thickness of the second substrate 4, and is not beneficial to the design of the display panel 100 for thinning, and by providing the protruding point with such a distance (0.5 to 5 micrometers), the scattering degree of blue light can be increased, the light emitting effect of the display panel can be improved, and the design of the display panel 100 for thinning can be facilitated.
In another possible embodiment, as shown in fig. 6, the scattering structure 40 includes at least one groove extending from the second surface 42 toward the first surface 41 and at least one protrusion extending from the second surface 42 toward a direction away from the first surface 41, and the at least one groove extending from the second surface 42 toward the first surface 41 and the at least one protrusion extending from the second surface 42 toward a direction away from the first surface 41 form the second scattering structure, that is, the second surface 42 is provided with both the grooves and the protrusions, and the protrusions and the grooves shown in fig. 6 are alternately arranged, and are all semicircular, but it will be understood by those skilled in the art that the above-mentioned arrangement of the protrusions and the grooves and the shapes of the protrusions and the grooves are merely an example, and that two protrusions and the like may be provided between adjacent grooves.
A third embodiment of the present invention relates to a display panel 300, which is substantially the same as the first embodiment, and is mainly different in that: in the third embodiment, the scattering structure 40 includes a first scattering structure 401 disposed on the first surface 41 and a second scattering structure 402 disposed on the second surface 42, the first scattering structure 401 including at least one first groove extending from the first surface 41 toward the second surface 42, and/or at least one first protrusion extending from the first surface 41 in a direction away from the second surface 42; the second scattering structure 402 comprises at least one second groove extending from the second surface 42 towards the first surface 41 and/or at least one second protrusion extending from the second surface 42 towards a direction away from the first surface 41.
Specifically, as shown in fig. 7, the first scattering structure 401 includes a first groove extending from the first surface 41 to the second surface 42; the second scattering structure 402 comprises a second groove extending from the second surface 42 towards the first surface 41. Through the arrangement of this structure, the blue light emitted by the light emitting unit 2 can be scattered by the first groove and the second groove, so that the scattering degree of the blue light becomes large, and the light emitting effect of the display panel 300 is improved.
It is worth mentioning that the number of the first grooves and the second grooves is plural, the interval between the adjacent first grooves is 5 micrometers to 50 micrometers, and the interval between the adjacent second grooves is 5 micrometers to 50 micrometers; preferably, the first grooves have a groove depth of 0.5 to 5 microns and the second grooves have a groove depth of 0.5 to 5 microns. By providing a plurality of first grooves and second grooves, it can be ensured that blue light emitted from the light emitting unit 2 can be scattered through the first grooves and the second grooves, thereby further improving the light emitting effect of the display panel 300. It is to be understood that the number of the first grooves and the second grooves is not particularly limited in this embodiment, and those skilled in the art may set different numbers of the first grooves and the second grooves according to actual needs. It can be understood that the closer spacing of the first grooves or the second grooves increases the difficulty of the manufacturing process of the display panel 100, and the farther spacing of the first grooves or the second grooves easily causes poor scattering effect of blue light, so that the difficulty of the manufacturing process of the display panel 100 is not increased while the scattering degree of blue light is ensured to be increased and the light emitting effect of the display panel is improved by arranging the first grooves or the second grooves with such spacing (5 micrometers to 50 micrometers); in addition, since the depth of the first groove or the second groove is shallow, which easily causes poor scattering effect of blue light, the depth of the first groove or the second groove is deep, which easily causes poor structural stability of the second substrate 4, and thus the stability of the display panel 100 is not high, by providing the first groove or the second groove with such a depth (0.5 micrometers to 5 micrometers), the scattering degree of blue light can be increased, the light emitting effect of the display panel can be improved, and the stability of the display panel 100 can be ensured.
Specifically, the cross-sectional shape of the first groove in the thickness direction of the display panel 100 is one or several of square, semicircle, triangle and trapezoid, and the shape of the second groove is one or several of square, semicircle, triangle and trapezoid, it is to be understood that the cross-sectional shape of the first groove in the thickness direction of the display panel 100 in fig. 7 is square, the cross-sectional shape of the second groove in the thickness direction of the display panel 100 is semicircle, but the shapes of the first groove and the second groove are not limited to this, and may be any other shape, the shapes of the first groove need not be completely uniform, for example, the first groove may be square and semicircle alternately arranged, and the shape of the second groove need not be completely uniform, for example, the first groove may be triangle and semicircle alternately arranged, and the shape of the first groove and the second groove, the number of the shapes of the first groove and the second groove arranged on the second substrate 4 are not particularly limited in this embodiment.
It should be noted that the first surface 41 may be provided with a protrusion, and the second surface 42 may be provided with a groove; providing a protrusion on the first surface 41 and a protrusion on the second surface 42; the provision of grooves on the first surface 41, protrusions on the second surface 42, etc. can achieve the same technical effect, and in order to avoid repetition, no further description is given here.
A fourth embodiment of the present invention relates to a display device including the above display panel. The display device has beneficial luminous effect.
A fifth embodiment of the present invention relates to a method for manufacturing a display panel, and a specific flow of this embodiment is shown in fig. 8, including:
s501: a first substrate is provided.
In step S501, the first substrate may be a glass substrate or a flexible substrate, and the material of the first substrate is not particularly limited in this embodiment.
S502: a plurality of light emitting units are formed on a first substrate.
With respect to step S502, specifically, the light emitting units in the present embodiment include LED chips, micro chips, OLED chips, and the like, and the formed plurality of light emitting unit arrays are arranged on the first substrate. Taking the light emitting unit as an LED chip as an example, the LED chip includes a buffer layer, an N-GaN layer (N-type gallium nitride layer), an active layer, and a P-GaN layer (P-type gallium nitride layer) which are sequentially stacked, and the epitaxial growth process (i.e., the preparation process) of the LED chip may be metal organic chemical vapor deposition.
S503: a second substrate is provided.
In step S503, the second substrate may be a glass substrate or a flexible substrate (such as transparent polyimide), and the material of the second substrate is not particularly limited in this embodiment.
S504: a light shielding layer is formed on the second substrate.
With respect to step S504, in particular, the method of manufacturing the light shielding layer includes film sticking, photolithography, laser processing, inkjet printing, 3D printing, screen printing, and microcontact printing. The formed light shielding layer includes a plurality of first holes and a plurality of second holes. In addition, the material of the shading layer can be black matrix material, so that the light crosstalk of adjacent light emitting units is further avoided.
S505: a color conversion layer is formed within the first aperture.
In the step S505, specifically, the photoresist mixed with the red and green dyes (i.e. the color conversion layer is prepared) is prepared in the first hole by a printing process or a yellow light process, and it is understood that the red and green dyes may be cadmium sulfide/cadmium selenide containing cadmium, indium phosphide containing no cadmium, and the like.
S506: and patterning the position, opposite to the second hole, of the second substrate to form a scattering structure.
In step S506, specifically, the patterning the position of the second substrate opposite to the second hole to form a scattering structure may be: and forming the scattering structure at the position of the second substrate opposite to the second hole through wet etching or dry etching.
In order to facilitate understanding, a specific step of patterning the second substrate in this embodiment will be described in detail below by taking dry etching as an example: and determining the region of the substrate to be patterned (namely the position, opposite to the second hole, of the second substrate), coating photoresist on the region, except the region, of the second substrate, and removing the region, not coated with the photoresist, of the metal layer by dry etching. Dry etching is a technique for etching a thin film with plasma, and has two characteristics when gas exists in the form of plasma: on one hand, the chemical activity of the gases in the plasma is much stronger than that of the gases in the normal state, and the gases can react with the materials more quickly by selecting proper gases according to different etched materials, so that the purpose of etching and removing is realized; on the other hand, the plasma can be guided and accelerated by using an electric field so that the plasma has certain energy, and when the plasma bombards the surface of an etched object, atoms of the etched object material can be knocked out, so that the purpose of etching is realized by using physical energy transfer.
S507: and attaching the shading layer to the light-emitting unit.
Compared with the prior art, the embodiment of the invention has the advantages that the shading layer is provided with the first holes and the second holes, each light emitting unit corresponds to one first hole or one second hole, and the color conversion layer is arranged in the first hole, so that on one hand, the light emitting units are usually LED chips, and the LED chips emit blue light, the blue light can be converted into red light and green light through the color conversion layer in the first holes, and the second holes are not provided with the color conversion layer, so that the blue light can be directly emitted, the color conversion of the light emitting units is realized, and on the other hand, the shading layer can effectively avoid the light crosstalk between the adjacent light emitting units, so that the light emitting effect of the display panel is improved; because the blue light is directly provided by the light-emitting unit, compared with red light and green light, the scattering degree of the blue light is lower, and the scattering structure is arranged at the position, opposite to the second hole, of the second substrate, so that the blue light emitted by the light-emitting unit can be scattered through the scattering structure, the scattering degree of the blue light is increased, namely the light-emitting angle is increased, the occurrence of the reddening phenomenon is effectively avoided, and the light-emitting effect of the display panel is further improved.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (14)
1. A display panel, comprising: the light-emitting diode comprises a first substrate, a plurality of light-emitting units, a light-shielding layer and a second substrate which are sequentially stacked; a plurality of first holes and a plurality of second holes are formed in one side, facing the light emitting unit, of the light shielding layer;
further comprises: a color conversion layer disposed in the first hole but not in the second hole, a scattering structure being provided at a position of the second substrate facing the second hole, the scattering structure not being provided at a position of the second substrate facing the first hole, each of the light emitting units corresponding to one of the first hole or the second hole;
the light scattering particles are added into the planarization layer in the second holes;
the light emitting unit is a chip for emitting blue light, and the color conversion layer is used for converting the blue light emitted by the light emitting unit corresponding to the first hole and passing through the first hole into red light or green light.
2. The display panel according to claim 1, wherein the second substrate comprises a first surface adjacent to the second hole, a second surface disposed opposite to the first surface, and/or the scattering structure is disposed on the first surface.
3. The display panel of claim 2, wherein the scattering structure comprises a first scattering structure disposed on the first surface and/or a second scattering structure disposed on the second surface,
the first scattering structure comprises at least one first groove extending from the first surface towards the second surface and/or at least one first protrusion extending from the first surface in a direction away from the second surface;
the second scattering structure comprises at least one second groove extending from the second surface towards the first surface and/or at least one second protrusion extending from the second surface in a direction away from the first surface.
4. The display panel of claim 3, wherein the first scattering structure comprises a plurality of the first grooves and the second scattering structure comprises a plurality of the second grooves; the interval between the adjacent first grooves is 5 micrometers to 50 micrometers, and the interval between the adjacent second grooves is 5 micrometers to 50 micrometers.
5. The display panel of claim 4, wherein the first and second grooves have a groove depth of 0.5 to 5 microns.
6. The display panel according to any one of claims 3 to 5, wherein the first groove and the second groove have one of a square shape, a semicircular shape, a triangular shape, and a trapezoidal shape in a cross-sectional shape along a thickness direction of the display panel.
7. The display panel of any one of claims 1-5, further comprising a thermally conductive layer covering the light emitting unit.
8. The display panel of claim 7, wherein the thermally conductive layer has a thickness that is 0.5 to 5 microns thicker than the thickness of the light emitting unit.
9. The display panel of claim 7, wherein the material of the thermally conductive layer comprises a polymer matrix and thermally conductive nanoparticles.
10. The display panel of claim 9, wherein the polymer matrix comprises a polymethacrylate or a polysiloxane.
11. The display panel of claim 9, wherein the thermally conductive nanoparticles comprise nano aluminum oxide, nano boron nitride, nano silver wires, gold nanospheres, carbon nanotubes, or graphene.
12. The display panel according to any one of claims 1 to 5, wherein a refractive index of the planarizing layer is smaller than a refractive index of the second substrate.
13. The display panel of claim 12, wherein the planarizing layer comprises a material selected from the group consisting of polymethacrylate, polysiloxane, and epoxy.
14. A display device comprising the display panel according to any one of claims 1 to 13.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104536198A (en) * | 2015-02-03 | 2015-04-22 | 京东方科技集团股份有限公司 | Display substrate, display panel and display device |
| CN107195653A (en) * | 2016-03-14 | 2017-09-22 | 群创光电股份有限公司 | Display device |
| CN108828834A (en) * | 2018-05-17 | 2018-11-16 | 友达光电股份有限公司 | Display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106601928B (en) * | 2016-12-02 | 2018-04-27 | 深圳市华星光电技术有限公司 | OLED display |
| CN109962080A (en) * | 2017-12-22 | 2019-07-02 | 财团法人工业技术研究院 | Display device |
| TWI658301B (en) * | 2017-12-22 | 2019-05-01 | 財團法人工業技術研究院 | Display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104536198A (en) * | 2015-02-03 | 2015-04-22 | 京东方科技集团股份有限公司 | Display substrate, display panel and display device |
| CN107195653A (en) * | 2016-03-14 | 2017-09-22 | 群创光电股份有限公司 | Display device |
| CN108828834A (en) * | 2018-05-17 | 2018-11-16 | 友达光电股份有限公司 | Display panel |
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