CN112150937A - Color conversion assembly and display panel - Google Patents
Color conversion assembly and display panel Download PDFInfo
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- CN112150937A CN112150937A CN201910580212.4A CN201910580212A CN112150937A CN 112150937 A CN112150937 A CN 112150937A CN 201910580212 A CN201910580212 A CN 201910580212A CN 112150937 A CN112150937 A CN 112150937A
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- 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
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Abstract
The invention discloses a color conversion assembly and a display panel. The color conversion assembly comprises a light conversion layer, wherein the light conversion layer comprises a black matrix, a color conversion layer and a lens; the black matrix is provided with a plurality of channels which are arranged in an array; the color conversion layer is positioned in at least part of the channel and can convert incident light into light with a wavelength range different from that of the incident light; a lens is disposed in each channel, wherein the lens is located on the light-entry side of the color conversion layer in the channel that houses the color conversion layer. According to the color conversion assembly provided by the embodiment of the invention, when incident light generated by the light source enters the channel, the incident light can be homogenized and converged by the lens, the more homogenized incident light enters the color conversion layer for excitation and conversion, the utilization rate of light energy can be improved, the uniformity of the converted emergent light is improved, and the display effect is improved.
Description
Technical Field
The invention relates to the field of display, in particular to a color conversion assembly and a display panel.
Background
Flat panel Display devices such as Liquid Crystal Display (LCD) devices, Organic Light Emitting Diode (OLED) devices, and Display devices using Light Emitting Diode (LED) devices have advantages such as high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, desktop computers, and the like, and are the mainstream of Display devices.
The display device may implement a display supporting color patterns through a variety of colorization schemes. In some embodiments, colorization is achieved by adding a color film on the light emitting substrate. However, in the color film in the prior art, when the light intensity of the light source is not uniform, the light intensity of the emergent light passing through the color film is still not uniform, which affects the display effect.
Disclosure of Invention
The invention provides a color conversion assembly and a display panel, which can improve the light intensity uniformity of light emitted from the color conversion assembly and improve the display effect.
In one aspect, an embodiment of the present invention provides a color conversion module, which includes a light conversion layer, where the light conversion layer includes a black matrix, a color conversion layer, and a lens; the black matrix is provided with a plurality of channels which are arranged in an array; the color conversion layer is positioned in at least part of the channel and can convert incident light into light with a wavelength range different from that of the incident light; a lens is disposed in each channel, wherein the lens is located on the light-entry side of the color conversion layer in the channel that houses the color conversion layer.
According to one aspect of an embodiment of the invention, the lens is a Fresnel lens, and the threaded surface of the Fresnel lens is disposed toward the color conversion layer within the channel that receives the color conversion layer.
According to one aspect of an embodiment of the invention, the lenses are arranged in layers.
According to one aspect of an embodiment of the present invention, each channel has opposing first and second openings, the second opening having a size greater than the first opening, and the lens is disposed proximate to the first opening.
According to an aspect of an embodiment of the invention, the inner wall of at least part of the channel is a curved inner wall, preferably a spherical inner wall.
According to an aspect of an embodiment of the invention, the light conversion layer further comprises a reflective layer, the reflective layer being located on an inner wall of the channel.
According to an aspect of an embodiment of the present invention, the color conversion module further includes: the first distributed Bragg reflection films are arranged corresponding to the channels one by one, the first distributed Bragg reflection films are positioned on the light incidence side of the lens, and the first distributed Bragg reflection films are configured to allow light rays with the same wavelength range as the incident light rays to penetrate through.
According to an aspect of an embodiment of the present invention, the color conversion module further includes: the second distributed Bragg reflection films are arranged in one-to-one correspondence with the color conversion layers and are positioned on one sides of the color conversion layers, which are back to the lens, and the second distributed Bragg reflection films are configured to allow light rays emitted by the color conversion layers in the corresponding channels to penetrate through.
According to an aspect of an embodiment of the present invention, the color conversion module further includes: and the transmission layer is correspondingly arranged in the channel which does not contain the color conversion layer, wherein in the channel which contains the transmission layer, the lens is positioned at the light inlet side of the transmission layer.
According to one aspect of the embodiment of the invention, the color conversion assembly further comprises antireflection films, the antireflection films and the transmission layers are arranged in a one-to-one correspondence manner, and the antireflection films are positioned on one sides of the transmission layers, which are back to the lens.
According to an aspect of the embodiment of the invention, the antireflection film and the second distributed bragg reflector film are arranged in the same layer.
According to an aspect of an embodiment of the present invention, the incident light is blue light, wherein the color conversion layer in the partial channel is capable of emitting red light; the color conversion layers in some of the channels are capable of emitting green light.
In another aspect, an embodiment of the present invention provides a display panel, which includes: the light-emitting substrate is provided with a light-emitting surface and comprises a plurality of light-emitting units which are arranged in an array; and the color conversion assembly according to any one of the preceding embodiments, located on the light emitting surface of the light emitting substrate, wherein each channel is disposed corresponding to at least one light emitting unit.
According to the color conversion assembly of the embodiment of the invention, a lens is arranged in each channel, wherein the lens is positioned at the light inlet side of the color conversion layer. When the incident light that the light source produced gets into the passageway, lens can be with the incident light homogenization and assemble, and the incident light of more homogenization gets into the color conversion layer and arouses the conversion, can improve the utilization ratio of light energy to improve the even degree of emergent light after the conversion, thereby improve display effect.
In some optional embodiments, the lens is a fresnel lens, and the occupied volume in the thickness direction is saved while the homogenization performance and the convergence performance of incident light are ensured, so that the thickness of the color conversion assembly is reduced, and the color conversion assembly is lighter and thinner.
In some optional embodiments, at least part of the inner walls of the channel are curved inner walls, so that the intensity of light rays in the channel can be further homogenized, the uniformity of emergent light rays can be further improved, and the display effect can be improved.
In some alternative embodiments, the color conversion assembly further comprises a reflective layer on the inner wall of the channel, wherein the inner wall of the channel is a curved inner wall such that the reflective layer forms a concave structure. The reflection layer with the concave surface structure can collimate and further homogenize light rays in the channel, on one hand, the light energy utilization rate can be improved, the display effect can be further improved, on the other hand, the light rays are converged in the channel, the light rays in the channel are prevented from being transmitted to an adjacent channel, and the problem of light ray crosstalk between the channels is solved.
In some alternative embodiments, the color conversion assembly further comprises a first distributed bragg reflector film located on the light-in side of the lens, i.e., between the light source and the color conversion layer. The first distributed Bragg reflection film allows incident light to enter the channel, and reflects light of other colors obtained by conversion in the channel, so that the converted light irradiates the light emitting side opposite to the light source, and the utilization rate of light energy is improved.
In some optional embodiments, the color conversion assembly further comprises a second distributed bragg reflector film located on a side of the color conversion layer facing away from the lens, i.e., on a side of the color conversion assembly near the emergent light. The second distributed Bragg reflection film allows light emitted by the color conversion layer in the corresponding channel to penetrate and reflect light in at least one other wavelength range, so that the purity of the light emitted by the corresponding channel is higher, and when the second distributed Bragg reflection film reflects incident light, the utilization rate of light energy can be improved.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.
FIG. 1 shows a schematic top view of a color conversion assembly according to an embodiment of the invention;
FIG. 2 shows a schematic cross-sectional view along AA in FIG. 1;
FIG. 3 shows a schematic top view of a lens in a color conversion assembly according to an embodiment of the invention;
FIG. 4 shows a cross-sectional view in the direction BB in FIG. 3;
fig. 5 illustrates a schematic cross-sectional structure of a display panel according to an embodiment of the present invention;
fig. 6a to 6h are schematic cross-sectional views illustrating a process of fabricating a color conversion assembly according to an embodiment of the present invention.
In the figure:
1000-a display panel;
100-a color conversion component; CU-color conversion unit; a CL-light converting layer;
110-a first substrate;
120-black matrix; 121-channel; OP1 — first opening; OP2 — second opening;
130-a color conversion layer;
140-a lens;
150-a reflective layer;
161-a first distributed bragg reflector film;
162-a second distributed bragg reflector film;
170-a transmissive layer;
180-antireflection coating;
190-a second substrate;
200-a light-emitting substrate; 200 a-a light emitting face; 210-a light emitting unit;
300-a planar layer;
l1-incident ray.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
The embodiment of the invention provides a color conversion assembly which can be applied to a display panel and is used for realizing colorization of emergent light of the display panel. The Display panel may be a Display panel using Light Emitting Diode (LED) devices, such as a Micro-LED Display panel, and in some embodiments, may also be an Organic Light Emitting Diode (OLED) Display panel, a Liquid Crystal Display (LCD) panel, or the like.
In most embodiments, the description will be made by taking a display panel using LED devices as an example. The LED emits monochromatic light, and the color conversion assembly converts the monochromatic light into light of various colors for display.
Fig. 1 shows a schematic top view of a color conversion assembly according to an embodiment of the present invention, wherein fig. 1 shows a structure of a part of a region of the color conversion assembly. The color conversion unit 100 has a plurality of color conversion units CU arranged in an array, and the boundary lines between the plurality of color conversion units CU are shown by dotted lines in fig. 1. When the color conversion assembly 100 is used in a display panel, a plurality of color conversion units CU correspond to a plurality of pixels of the display panel, respectively.
Fig. 2 shows a schematic cross-sectional view along AA in fig. 1. The color conversion member 100 includes a light conversion layer CL including a Black Matrix (BM) 120, a color conversion layer 130, and a lens 140.
The black matrix 120 has a plurality of channels 121 arranged in an array. The black matrix 120 is made of a black light absorbing material, and may be a colorant of a black pigment or dye. In some embodiments, the black matrix 120 is made of, for example, titanium black, lignin black, a composite oxide pigment such as iron or manganese, a combination of the above pigments, and the like.
In the embodiment, the incident light L1 is, for example, irradiated from the bottom of the black matrix 120 to the plurality of channels 121 of the black matrix 120.
The color conversion layer 130 may be a layer structure that realizes color conversion by filtering light, or may be a color conversion layer including a photoluminescent material, which may be a quantum dot layer, a fluorescent particle layer, or the like. In this embodiment, the color conversion layer is exemplified as a quantum dot layer.
The quantum dot layer is made of quantum dot material capable of forming a specific excitation wavelength, the quantum dot material includes, but is not limited to, quantum dot material with zinc sulfide (ZnS) as shell and one or more of cadmium selenide (CdSe), cadmium telluride (CdTe), cadmium sulfide (CdS), indium phosphide (InP), perovskite as core, and the quantum dot material further includes scatterer such as titanium oxide, or silicon dioxide.
In some embodiments, incident light ray L1 may be a blue light ray, and color conversion layer 130 is located in at least part of channel 121, for example, in FIG. 2, left channel 121 and middle channel 121 each house color conversion layer 130. The color conversion layer 130 in the partial channel 121 can convert the red light, for example, in fig. 2, the color conversion layer 130 in the left channel 121 is a red quantum dot layer, which absorbs the incident light L1 of the blue light and converts the light into red light to emit outward. The color conversion layer 130 in the partial channel 121 can convert green light, for example, in fig. 2, the color conversion layer 130 in the middle channel 121 is a green quantum dot layer, which absorbs the incident light L1 of blue light and converts the incident light into green light to be emitted outwards.
It is understood that the color of incident light ray L1 and the color conversion manner of color conversion layer 130 are only examples, and in other embodiments, other configurations may be performed. For example, in some embodiments, the incident light ray L1 may be an Ultraviolet (UV) light ray. For example, in some embodiments, each channel 121 houses a color conversion layer 130 therein, wherein the color conversion layer 130 in a portion of the channels 121 is a quantum dot layer that converts incident light L1 into red light; the color conversion layer 130 in the partial channel 121 is a quantum dot layer that converts the incident light L1 into green light; the color conversion layer 130 in the partial channel 121 is a quantum dot layer that converts the incident light L1 into blue light. In addition, the color conversion layer 130 is not limited to converting the incident light L1 into red, green, and blue light, and in other embodiments, the color conversion layer 130 in the partial channel 121 may be a quantum dot layer that converts the incident light L1 into yellow light, cyan light, and the like.
The color conversion assembly 100 of the embodiment of the present invention further includes a lens 140, and the lens 140 is disposed in each channel 121. Wherein lens 140 is positioned on the light-incident side of color conversion layer 130 within channel 121 that houses color conversion layer 130.
According to the color conversion assembly 100 of the embodiment of the invention, a lens 140 is disposed in each channel 121, wherein the lens 140 is located on the light incident side of the color conversion layer 130. When the incident light L1 generated by the light source enters the channel 121, the lens 140 can homogenize and converge the incident light L1, and the homogenized incident light L1 enters the color conversion layer 130 for excitation and conversion, so that the utilization rate of light energy can be improved, the uniformity of the converted emergent light can be improved, and the display effect can be improved.
Fig. 3 shows a schematic top view of a lens in a color conversion assembly according to an embodiment of the present invention, and fig. 4 shows a cross-sectional view in the direction BB in fig. 3. In some embodiments, the lens 140 may be a fresnel lens, so as to ensure the homogenization performance and the convergence performance of the incident light L1, save the occupied volume in the thickness direction, reduce the thickness of the color conversion assembly 100, and make it thinner and lighter. In some embodiments, the light source that generates incident light ray L1 is a Micro-LED, and accordingly, the focal length and the periodic distribution of the Fresnel lens can be optimized according to the light emission characteristics of the Micro-LED.
In some embodiments, the fresnel lens comprises two opposing surfaces, one of which is flat and the other of which is threaded. Herein, the screw surface of the fresnel lens means a surface thereof having a plurality of concentric ring structures.
In some embodiments, the threaded surface of the fresnel lens is disposed toward the color conversion layer 130 in the channel 121 that houses the color conversion layer 130, so that the color conversion layer 130 can tightly cover the threaded surface of the fresnel lens, and the effect of light transmission is prevented from being affected by the occurrence of a partial gap between the two.
In some embodiments, the lenses 140 are disposed in layers.
As shown in fig. 2, in the present embodiment, each channel 121 has a first opening OP1 and a second opening OP2 opposite to each other, the size of the second opening OP2 is larger than that of the first opening OP1, and the lens 140 may be disposed near the first opening OP1, so that the light in the channel 121 can be irradiated outward from the second opening OP2 in a collimated manner, thereby improving the display effect. Herein, the lens 140 disposed near the first opening OP1 means that the distance between the lens 140 and the first opening OP1 is smaller than the distance between the lens 140 and the second opening OP 2.
The light conversion layer CL of the color conversion assembly 100 may further include a reflective layer 150, the reflective layer 150 being located on the inner wall of the channel 121. In some embodiments, the reflective layer 150 may be a film layer of high reflective material plated on the inner wall of the channel 121, wherein the reflective material includes, but is not limited to, a metal material such as silver, aluminum, etc. By disposing the reflective layer 150, light in the channel 121 can be reduced from propagating to the adjacent channel 121, and the problem of light crosstalk between the channels 121 is improved.
In some embodiments, at least some of the inner walls of the channel 121 are curved inner walls, which can further homogenize the intensity of the light in the channel 121, further improve the uniformity of the emitted light, and improve the display effect.
In some alternative embodiments, the inner wall of the channel 121 is a spherical inner wall, i.e., a curved inner wall comprising a part of a sphere, such that the reflective layer 150 forms a concave structure. The reflecting layer 150 with the concave structure can collimate and further homogenize the light in the channel 121, so that the light energy utilization rate can be improved and the display effect can be further improved; on the other hand, the light is converged in the channel 121, so that the light in the channel 121 is prevented from being transmitted to the adjacent channel 121, and the problem of light crosstalk between the channels 121 is improved.
In some embodiments, the color conversion assembly 100 may further include a first distributed bragg reflector film 161 disposed corresponding to at least a portion of the channel 121. In the present embodiment, the first distributed bragg reflector 161 is disposed in one-to-one correspondence with each of the channels 121. In some embodiments, a first distributed bragg reflector film 161 is disposed within the channel 121. In other embodiments, the first distributed bragg reflector 161 may also be disposed outside the channel 121.
The first distributed bragg reflector 161 is located on the light incident side of the lens 140. When the incident light L1 irradiates the color conversion device 100, it sequentially passes through the first distributed bragg reflector 161 and the lens 140 and enters the color conversion layer 130.
The first distributed bragg reflector film 161 may be a stack of two thin films having high and low refractive indices, the combination of which includes, but is not limited to: TiO22Film and Al2O3Film, TiO2Film and SiO2Film, Ta2O5Film and Al2O3Film, HfO2Film and SiO2And the film comprises a high-refractive-index film and a low-refractive-index film in each combination.
The first distributed bragg reflector film 161 is configured to allow light of the same wavelength range as the incident light L1 to pass through, and in some embodiments, the first distributed bragg reflector film 161 is also configured to reflect light of at least one other wavelength range.
The first distributed bragg reflector film 161 is located on the light incident side of the lens 140, i.e., between the light source and the color conversion layer 130. The first distributed bragg reflector 161 allows the incident light L1 to enter the channel 121, and reflects the converted lights of other colors in the channel 121, so that the converted lights are all irradiated to the light emitting side opposite to the light source, and the utilization rate of light energy is improved.
In some embodiments, the color conversion assembly 100 may further include a second distributed bragg reflector film 162, the second distributed bragg reflector film 162 being disposed corresponding to the channel 121 accommodating the color conversion layer 130. In some embodiments, the second distributed bragg reflector film 162 is disposed in one-to-one correspondence with the color conversion layer 130. The second distributed bragg reflector film 162 is located on a side of the color conversion layer 130 facing away from the lens 140. The light converted by the color conversion layer 130 may be irradiated to the outside through the second distributed bragg reflector film 162.
The second distributed bragg reflector film 162 may be formed by stacking two kinds of thin films having high and low refractive indexes, and the combination of the two kinds of thin films includes, but is not limited to: the film comprises a TiO2 film and an Al2O3 film, a TiO2 film and an SiO2 film, a Ta2O5 film and an Al2O3 film, and an HfO2 film and an SiO2 film, wherein in each group of combination, the former is a high-refractive-index film, and the latter is a low-refractive-index film.
The second distributed bragg reflector film 162 is configured to allow light emitted from the color conversion layer 130 in the corresponding channel 121 to pass therethrough, and in some embodiments, the second distributed bragg reflector film 162 is also configured to reflect light of at least one other wavelength range. In some embodiments, second distributed bragg reflector film 162 may be configured to reflect light in the same wavelength range as incident light L1, such that incident light L1 that is not absorbed by color conversion layer 130 is reflected again to color conversion layer 130 for excitation conversion.
A second distributed bragg reflector film 162 is located on a side of the color conversion layer 130 facing away from the lens 140, i.e., on a side of the color conversion assembly 100 that is closer to the outgoing light rays in some embodiments. The second distributed bragg reflector film 162 allows the light emitted from the color conversion layer 130 in the corresponding channel 121 to pass through and reflect the light in at least one other wavelength range, so that the purity of the light emitted from the corresponding channel 121 is higher, and when the second distributed bragg reflector film 162 reflects the incident light L1, the utilization rate of light energy can be improved.
In some embodiments, the color conversion assembly 100 further comprises a transmissive layer 170. The transmissive layer 170 is positioned in the channel 121 of the plurality of channels 121 where the color conversion layer 130 is not disposed, and the transmissive layer 170 transmits light having the same wavelength range as the incident light L1. In some embodiments, the transmissive layer 170 may be a clear glue layer.
As shown in fig. 2, in the present embodiment, the right channel 121 accommodates a transmissive layer 170. The incident light L1 is blue light, the transmissive layer 170 transmits the blue light, and the emergent light of the corresponding channel is blue light. In fig. 2, the emergent light of the left channel 121 is red, the emergent light of the middle channel 121 is green, the emergent light of the right channel 121 is blue, and the channel 121 emitting red light, the channel 121 emitting green light, and the channel 121 emitting blue light are arranged in an array, so that full-color display of a picture can be realized.
Within the channel 121 that receives the transmissive layer 170, the lens 140 is located on the light incident side of the transmissive layer 170. When the incident light L1 generated by the light source enters the channel 121, the lens 140 can homogenize and converge the incident light L1, so as to improve the uniformity of the emergent light passing through the channel 121 accommodating the transmissive layer 170, thereby improving the display effect.
In some embodiments, color conversion assembly 100 may further include an antireflection film 180, where antireflection film 180 is disposed in correspondence with channel 121 that receives transmissive layer 170. In some embodiments, the antireflection film 180 is disposed in one-to-one correspondence with the transmissive layer 170. Antireflection coating 180 is located on the side of transmissive layer 170 facing away from lens 140. In this embodiment, the incident light L1 is a blue light, and the antireflection film 180 may be a blue light antireflection film.
In some embodiments, a first distributed bragg reflector film 161 of the color conversion assembly 100 is disposed corresponding to each channel 121. When the incident light L1 is blue light, the first distributed bragg reflector film 161 in the channel 121 accommodating the red quantum dot layer may be configured to allow the blue light to transmit and reflect the red light; the first distributed bragg reflector film 161 within the channel 121 housing the green quantum dot layer may be configured to allow blue light to pass through and reflect green light; the first distributed bragg reflector film 161 in the channel 121 accommodating the transmissive layer 170 may be configured to allow blue light to pass therethrough.
In some embodiments, the first distributed bragg reflector film 161 in the channel 121 corresponding to the plurality of outgoing light rays of the color conversion assembly 100 may be shared. For example, the first distributed bragg reflector films 161 respectively disposed in the channel 121 accommodating the red quantum dot layer, the channel 121 accommodating the green quantum dot layer, and the channel 121 accommodating the transmissive layer 170 may be the same type of distributed bragg reflector film configured to allow the blue light to transmit and reflect the red light and the green light.
The second distributed bragg reflector film 162 is disposed corresponding to the channel 121 accommodating the color conversion layer 130. In some embodiments, when the incident light L1 is blue light, the second distributed bragg reflector film 162 corresponding to the channel 121 accommodating the red quantum dot layer may be configured to allow the red light to pass through and reflect the blue light; the corresponding second distributed bragg reflector film 162 of the channel 121 accommodating the green quantum dot layer may be configured to allow the green light to pass therethrough and reflect the blue light.
In some embodiments, the second distributed bragg reflector film 162 in the channel 121 corresponding to the plurality of outgoing light rays of the color conversion assembly 100 may be shared. For example, the second distributed bragg reflector films 162 respectively disposed in the channels 121 accommodating the red quantum dot layers and the channels 121 accommodating the green quantum dot layers may be the same type of distributed bragg reflector film configured to allow the red light and the green light to pass therethrough and reflect the blue light.
In some embodiments, the antireflection film 180 may be disposed in the same layer as the second distributed bragg reflector film 162.
In some embodiments, the color conversion assembly 100 may further include a first substrate 110, and the first substrate 110 is located on the light incident side of the black matrix 120. The material of the first substrate 110 may be glass or a polymer material, wherein the polymer material may be selected from polycarbonate, polyvinyl chloride, polyester, acrylic resin, and the like.
As shown in fig. 2, in the present embodiment, each of the channels 121 has a first opening OP1 and a second opening OP2 opposite to each other, the first opening OP1 is close to the first substrate 110, and the second opening OP2 is far from the first substrate 110. The incident light L1 may be irradiated into the plurality of channels 121 from the bottom of the first substrate 110.
The color conversion assembly 100 may further include a second substrate 190, and the second substrate 190 is located on a side of the black matrix 120 facing away from the first substrate 110. Second substrate 190 and first substrate 110 together enclose a plurality of channels 121, and color conversion layer 130 is located between first substrate 110 and second substrate 190.
The material of the second substrate 190 may be glass or a polymer material, wherein an alternative polymer material is, for example, polycarbonate, polyvinyl chloride, polyester, acrylic resin, or the like. In some embodiments, the second substrate 190 may be bonded to the black matrix 120 by an adhesive and cover the plurality of channels 121, and meanwhile, the second substrate 190 covers the second distributed bragg reflector 162, the antireflection film 180, and the like, which are disposed corresponding to the channels 121. The adhesive can be a high-transmittance optical adhesive material, such as a thermosetting or UV curing material, a liquid optical transparent adhesive, and the like, which not only can ensure good transmittance of light, but also can achieve a light uniformizing effect.
The color conversion assembly 100 of the embodiment of the invention can be applied to a display panel for colorized display of the display panel.
The embodiment of the present invention further provides a display panel, which includes a light emitting substrate and a color conversion module, wherein the color conversion module of the display panel may be the color conversion module 100 according to any embodiment of the present invention.
Fig. 5 illustrates a schematic cross-sectional structure of a display panel according to an embodiment of the present invention. The display panel 1000 includes the light emitting substrate 200 and the color conversion assembly 100 of the previous embodiment.
The light emitting substrate 200 has a light emitting surface 200a, and the light emitting substrate 200 includes a plurality of light emitting cells 210 arranged in an array. In the present embodiment, the light emitting substrate 200 is, for example, a light emitting substrate using an LED device, wherein the plurality of light emitting units 210 are LED light emitting units respectively and are arranged in an array on the light emitting surface 200 a. The LED light emitting unit may be a single color LED light emitting unit such that the plurality of light emitting units 210 emit light of the same color. In some embodiments, the light emitting unit 210 is a blue LED light emitting unit. In some embodiments, the light emitting unit 210 is a Micro-LED light emitting unit.
The light-emitting substrate 200 is not limited to a light-emitting substrate using an LED device. In other embodiments, the light emitting substrate 200 may also be a light emitting substrate for an OLED display panel, a light emitting substrate for an LCD, that is, the light emitting substrate 200 may include at least a part of functional layers of the OLED display panel, and the OLED display panel is obtained by combining with the color conversion assembly 100; or the light emitting substrate 200 may include at least a portion of functional layers of an LCD, which is obtained by combining with the color conversion assembly 100.
Even if the light emitting substrate 200 is a light emitting substrate using LED devices, the light emitting unit 210 thereof is not limited to a blue LED light emitting unit, for example, in an alternative embodiment, the light emitting unit 210 may be an ultraviolet LED light emitting unit.
The color conversion member 100 is located on the light emitting surface 200a of the light emitting substrate 200, wherein each channel 121 is disposed corresponding to at least one light emitting unit 210. In the present embodiment, each of the light emitting units 210 is a blue LED light emitting unit. In the left channel 121 in fig. 5, the light emitted from the blue LED light emitting unit excites the color conversion layer 120, so that the light is converted into red light to be emitted outward; in the middle channel 121 in fig. 5, the light emitted from the blue LED light emitting unit excites the color conversion layer 120, so that the light is converted into green light to be emitted outward; in the right channel 121 in fig. 5, the blue light emitted from the blue LED light emitting unit transmits through the transmissive layer 160 to emit the blue light outwards. The channels 121 emitting red light, the channels 121 emitting green light and the channels 121 emitting blue light are arranged in an array, so that full-color display of pictures can be realized.
In this embodiment, the display panel 1000 may further include a flat layer 300, and the flat layer 300 is disposed between the light emitting surface 200a of the light emitting substrate 200 and the first substrate 110 of the color conversion assembly 100. The planarization layer is an organic material, and is made of Cardo resin, polyimide resin, acrylic resin, or the like. The planarization layer 300 can improve the planarity of the surface of the light-emitting substrate 200 to facilitate integration with the color conversion assembly 100. In some embodiments, the thickness of the planarization layer 300 is greater than or equal to the height of the light emitting unit 210 protruding from the light emitting surface 200 a.
According to the display panel 1000 of the embodiment of the invention, a lens 140 is disposed in each channel 121 of the color conversion assembly 100, wherein the lens 140 is located at the light incident side of the color conversion layer 130. When the incident light generated by the light emitting unit 210 enters the channel 121, the lens 140 can homogenize and converge the incident light, and the homogenized incident light enters the color conversion layer 130 for excitation and conversion, so that the utilization rate of light energy can be improved, and the uniformity of the converted emergent light can be improved, thereby improving the display effect.
In some embodiments, the color conversion assembly 100 further comprises a reflective layer 150 on the inner wall of the channel 121, wherein the inner wall of the channel 121 is a curved inner wall such that the reflective layer 150 forms a concave structure. The reflection layer 150 with the concave structure can collimate and further homogenize the light in the channel 121, so that on one hand, the light utilization rate can be improved, the display effect can be further improved, on the other hand, the light can be converged in the channel 121, the light in the channel 121 is prevented from being transmitted to the adjacent channel 121, and the problem of light crosstalk between the channels 121 is solved.
It should be noted that the forming process of the display panel 1000 including the color conversion assembly 100 may be various. For example, in some embodiments, the color conversion element 100 may be directly formed on the light emitting substrate 200 and form the display panel 1000 together with the light emitting substrate 200. In other embodiments, the color conversion member 100 may be separately fabricated and combined with the light-emitting substrate 200 by transfer to obtain the display panel 1000.
The manufacturing process of the color conversion module 100 of the above embodiment will be explained below.
Fig. 6a to 6h are schematic cross-sectional views illustrating a process of fabricating a color conversion assembly according to an embodiment of the present invention.
As shown in fig. 6a, a plurality of first distributed bragg reflector films 161 are formed on the first substrate 110 in an array, and the first distributed bragg reflector films 161 are configured to allow light having the same wavelength range as the incident light L1 to pass therethrough and reflect at least one of the others. The positions at which the plurality of first distributed bragg reflection films 161 are configured to allow light having the same wavelength range as the incident light L1 to pass therethrough and reflect at least one of the others correspond to the positions of the plurality of color conversion units CU, that is, the positions of the plurality of pixels of the display panel.
The process of forming the first distributed bragg reflector 161 may be physical vapor deposition, chemical vapor deposition, etc., and the first distributed bragg reflector 161 may be configured to allow blue light to pass therethrough and reflect red light and green light.
As shown in fig. 6b, a lens 140 is formed on each first distributed bragg reflector film 161. The lens 140 may be a fresnel lens and the manufacturing method includes photolithography, embossing, and the like.
As shown in fig. 6c, a black matrix 120 is formed on the first substrate 110. Processes of forming the black matrix 120 include film attaching, photolithography, laser processing, inkjet printing, 3D printing, screen printing, micro-contact printing, and the like. The black matrix 120 is a patterned structure including a plurality of channels 121 arranged in an array. The first distributed bragg reflector 161 and the lens 140 are respectively located in the corresponding channels 121.
As shown in fig. 6d, a reflective layer 150 is formed on the inner wall of the channel 121. The process of forming the reflective layer 150 may be physical vapor deposition, chemical vapor deposition, etc., and the reflective layer 150 may be a film layer of a high reflective material plated on the inner wall of the channel 121, wherein the reflective material includes, but is not limited to, a metal material such as silver, aluminum, etc.
As in fig. 6e, color conversion layer 130 is formed within at least a portion of channel 121. In this embodiment, color conversion layer 130 is formed in a portion of channels 121, and transmissive layer 170 is formed in the remaining portion of channels 121. Color conversion layer 130 may be a quantum dot layer, and may be formed within channel 121 by a printing process, a yellow light process, or the like. The transmissive layer 170 may be a transparent adhesive layer. In some embodiments, the tops of color conversion layer 130, transmissive layer 170 are no higher than the top openings of corresponding channels 121.
As shown in fig. 6f, an antireflection film 180 is formed on the transmissive layer 170. The reflection reducing coating 180 is, for example, a blue light reflection reducing coating, and the reflection reducing coating 180 is disposed corresponding to the channel 121 accommodating the transmission layer 170. The process for forming antireflection film 180 may be physical vapor deposition, chemical vapor deposition, or the like.
As shown in fig. 6g, a second distributed bragg reflector film 162 is formed on the color conversion layer 130. The second distributed bragg reflector film 162 may be configured to allow red and green light to pass therethrough and reflect blue light, and the second distributed bragg reflector film 162 is disposed corresponding to each of the channels 121 accommodating the color conversion layer 130 in this embodiment. The process of forming the second distributed bragg reflector film 162 may be physical vapor deposition, chemical vapor deposition, or the like.
As shown in fig. 6h, a second substrate 190 is formed on the black matrix 120. Second substrate 190 and first substrate 110 together enclose a plurality of channels 121, and color conversion layer 130 is located between first substrate 110 and second substrate 190.
The material of the second substrate 190 may be glass or a polymer material, wherein an alternative polymer material is, for example, polycarbonate, polyvinyl chloride, polyester, acrylic resin, or the like. In some embodiments, the second substrate 190 may be bonded to the black matrix 120 by an adhesive and cover the plurality of channels 121, and meanwhile, the second substrate 190 covers the second distributed bragg reflector 162, the antireflection film 180, and the like, which are disposed corresponding to the channels 121. The adhesive can be a high-transmittance optical adhesive material, such as a thermosetting or UV curing material, a liquid optical transparent adhesive, and the like, which not only can ensure good transmittance of light, but also can achieve a light uniformizing effect.
Thus, the color conversion module 100 of the embodiment of the present invention can be obtained. In the formation process of the color conversion assembly 100, the color conversion assembly 100 is separately manufactured and combined with the light emitting substrate in a transfer manner when forming the display panel. In other embodiments, the first substrate 110 of the color conversion device 100 may be formed on the light emitting substrate of the display panel first, and the subsequent steps are the same as the above steps, so that the display panel can be obtained without transferring the color conversion device 100. Before the first substrate 110 is formed on the light emitting surface of the light emitting substrate, a planarization layer may be formed on the light emitting surface of the light emitting substrate in advance. The planarization layer can improve the planarity of the surface of the light-emitting substrate for integration with the color conversion assembly 100.
In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A color conversion assembly comprising a light conversion layer comprising a black matrix, a color conversion layer, and a lens;
the black matrix is provided with a plurality of channels which are arranged in an array;
the color conversion layer is positioned in at least part of the channel, and the color conversion layer can convert incident light into light with a wavelength range different from that of the incident light;
the lens is disposed in each of the channels, wherein the lens is located on the light entrance side of the color conversion layer in the channel that houses the color conversion layer.
2. The color conversion assembly of claim 1, wherein the lens is a fresnel lens with a threaded surface disposed toward the color conversion layer within the channel that receives the color conversion layer;
preferably, each of the lenses is disposed in the same layer.
3. The color conversion assembly of claim 1, wherein each of said channels has opposing first and second openings, said second opening being larger in size than said first opening, said lens being disposed proximate to said first opening.
4. The color conversion assembly of claim 1, wherein at least a portion of the inner walls of the channels are curved, preferably spherical.
5. The color conversion assembly of any of claims 1-4, wherein the light conversion layer further comprises a reflective layer located on an inner wall of the channel.
6. The color conversion assembly of claim 1, further comprising:
the first distributed Bragg reflection film is arranged corresponding to each channel one by one, the first distributed Bragg reflection film is positioned on the light incidence side of the lens, and the first distributed Bragg reflection film is configured to allow light rays with the same wavelength range as the incident light rays to penetrate through.
7. The color conversion assembly of claim 1, further comprising:
the second distributed Bragg reflection film is arranged in one-to-one correspondence with the color conversion layer, is positioned on one side, back to the lens, of the color conversion layer, and is configured to allow light rays emitted by the color conversion layer in the corresponding channel to penetrate through.
8. The color conversion assembly of claim 1, further comprising:
a transmissive layer correspondingly disposed in the channel not accommodating the color conversion layer, wherein the lens is located at a light incident side of the transmissive layer in the channel accommodating the transmissive layer;
preferably, the color conversion assembly further comprises an antireflection film, the antireflection film and the transmission layer are arranged in a one-to-one correspondence manner, and the antireflection film is positioned on one side of the transmission layer, which is opposite to the lens;
preferably, the antireflection film and the second distributed bragg reflector film are arranged in the same layer.
9. The color conversion assembly of claim 1, wherein the incident light is a blue light, wherein,
a portion of the color conversion layer within the channel is capable of emitting red light;
portions of the color conversion layer within the channels are capable of emitting green light.
10. A display panel, comprising:
the light-emitting substrate is provided with a light-emitting surface and comprises a plurality of light-emitting units which are arranged in an array; and
the color conversion assembly according to any one of claims 1 to 9, located on the light emitting surface of the light emitting substrate, wherein each of the channels is disposed corresponding to at least one of the light emitting units.
Priority Applications (3)
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| CN201910580212.4A CN112150937A (en) | 2019-06-28 | 2019-06-28 | Color conversion assembly and display panel |
| PCT/CN2019/126262 WO2020258768A1 (en) | 2019-06-28 | 2019-12-18 | Color conversion assembly and display panel |
| KR1020217040393A KR20210157401A (en) | 2019-06-28 | 2019-12-18 | Color Conversion Assembly and Display Panel |
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| CN201910580212.4A CN112150937A (en) | 2019-06-28 | 2019-06-28 | Color conversion assembly and display panel |
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| KR (1) | KR20210157401A (en) |
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| CN115394214A (en) * | 2022-09-21 | 2022-11-25 | 上海天马微电子有限公司 | Light-emitting panel |
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| CN113820888A (en) | 2021-09-29 | 2021-12-21 | 联想(北京)有限公司 | Backlight assembly, manufacturing method thereof and display device |
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Also Published As
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| WO2020258768A1 (en) | 2020-12-30 |
| KR20210157401A (en) | 2021-12-28 |
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