CN112147809B

CN112147809B - Color conversion assembly, manufacturing method thereof and display panel

Info

Publication number: CN112147809B
Application number: CN201910578337.3A
Authority: CN
Inventors: 黄飞; 顾杨
Original assignee: Chengdu Vistar Optoelectronics Co Ltd
Current assignee: Chengdu Vistar Optoelectronics Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2021-08-27
Anticipated expiration: 2039-06-28
Also published as: CN112147809A; WO2020258765A1; KR20220002675A

Abstract

The invention discloses a color conversion assembly, a manufacturing method thereof and a display panel. The color conversion assembly includes: a black matrix having a plurality of channels; a color conversion layer located within at least a portion of the channel, the color conversion layer capable of converting to light having a target color; and the grating structure is positioned on the inner wall of at least part of the channel, wherein the grating structure is a light reflecting structure which is in a patterned bulge relative to the inner wall of the channel. According to the color conversion assembly provided by the embodiment of the invention, the light-reflecting grating structure reduces the penetration rate of light penetrating through the wall surface of the channel, so that the light in the channel is reduced to be transmitted to the adjacent channel, and the color cross problem between the channels of the adjacent sub-pixels is reduced. The grating structure can reflect the light which is not completely utilized by the color conversion layer to the color conversion layer again, so that the utilization rate of the incident light is improved, and the light emitting efficiency is improved. And the grating structure is a patterned convex structure, so that the uniformity of emergent light rays in the channel is improved.

Description

Color conversion assembly, manufacturing method thereof and display panel

Technical Field

The invention relates to the field of display, in particular to a color conversion assembly, a manufacturing method thereof 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 electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and are becoming 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, there are usually problems of color crosstalk between adjacent sub-pixels and low light extraction efficiency.

Disclosure of Invention

The invention provides a color conversion assembly, a manufacturing method thereof and a display panel, which can reduce the color crosstalk problem between channels of adjacent sub-pixels and improve the light extraction efficiency.

In a first aspect, an embodiment of the present invention provides a color conversion module, which includes: the black matrix is provided with a plurality of channels which are arranged in an array; a color conversion layer positioned within at least a portion of the channel, the color conversion layer capable of converting incident light into light having a target color; and the grating structure is positioned on the inner wall of at least part of the channel, wherein the grating structure is a light reflecting structure which is in a patterned bulge relative to the inner wall of the channel.

According to the color conversion assembly provided by the embodiment of the invention, on one hand, the light-reflecting grating structure reduces the penetration rate of light penetrating through the wall surface of the channel, so that the light in the channel is reduced to be transmitted to an adjacent channel, and the color cross problem between the channels of adjacent sub-pixels is reduced. On the other hand, the grating structure can reflect the light which is not completely utilized by the color conversion layer to the color conversion layer again, so that the utilization rate of the incident light is improved, and the light emitting efficiency is improved. On the other hand, the grating structure is a patterned convex structure, so that light irradiated to the grating structure is diffracted, and the uniformity of light emitted from the channel is improved.

According to an aspect of an embodiment of the present invention, a grating structure includes: the patterned organic layer is positioned on the inner wall of the channel and is provided with a structure which is in a patterned bulge relative to the inner wall of the channel; and a first reflective layer covering the organic layer.

The organic layer facilitates the fixing of the grating structure in the channel and the patterning is easier to achieve. The reflecting layer covers the organic layer, so that the patterned convex structure of the grating structure is formed together with the organic layer, and the light reflecting capacity of the grating structure is realized. The organic layer is a patterned bulge so that the grating structure is in a convex shape, thereby further enhancing the diffraction of light and further improving the uniformity of emergent light in the channel.

According to an aspect of an embodiment of the present invention, the color conversion module further includes: and the second reflecting layer is positioned on the inner wall of the channel, and the grating structure is positioned on the second reflecting layer.

The second reflective layer on the inner wall of the channel is better able to reflect light not utilized by the color conversion layer to the color conversion layer again. The grating structure and the second reflecting layer can reflect light rays in the channels, so that the light emitting efficiency of the color conversion assembly is further improved, and the cross color problem between the channels of the adjacent sub-pixels is further reduced.

According to an aspect of an embodiment of the present invention, each of the channels has a first opening and a second opening opposite to each other, the first opening is close to the incident light, and the second opening is far from the incident light, and the color conversion assembly further includes: and a color filter layer covering the second opening of the channel at least partially accommodating the color conversion layer, the color filter layer being capable of allowing light having a target color converted by the color conversion layer in the corresponding channel to pass therethrough and preventing other at least one light having a wavelength range different from that of the target color light from passing therethrough.

The color filter layer can reflect or absorb incident light which is not completely absorbed by the color conversion layer in the corresponding channel, and incident light mixed in emergent light is reduced, so that the problem of poor color gamut during display is solved.

According to an aspect of the embodiments of the present invention, the color filter layer includes a first distributed bragg reflector configured to allow the light having the target color converted by the color conversion layer in the corresponding channel to pass therethrough and reflect at least one other light having a wavelength range different from that of the light of the target color; and/or the color filter layer comprises a first planar layer of a hybrid light absorbing material that absorbs light of the same color as the incident light.

According to one aspect of an embodiment of the present invention, the color conversion layer is disposed at the second opening with a spacing space between the color conversion layer and the first opening.

In some embodiments, the light emitting unit (i.e., the light source) of the display panel is disposed at the first opening of the corresponding channel. Through setting up the space with color conversion layer and first opening, make it keep away from the light source, can reduce the influence of light source production of heat to color conversion layer, avoid the too fast decay problem of color conversion layer that light source production of heat arouses.

According to an aspect of an embodiment of the present invention, each of the channels has a first opening and a second opening opposite to each other, the first opening is close to the incident light, and the second opening is far from the incident light, and the color conversion assembly further includes: a second distributed Bragg reflector layer covering at least a portion of the second opening of the channel not provided with the color conversion layer, the second distributed Bragg reflector layer being configured to allow light of the same wavelength range as the incident light to pass therethrough and to reflect light of at least one other wavelength range.

According to an aspect of an embodiment of the present invention, the color conversion module further includes: a second planar layer of mixed scattering particles, the second planar layer filling the channels not provided with the color conversion layer.

In a second aspect, an embodiment of the present invention provides a display panel, which includes: a light emitting substrate including a plurality of light emitting cells; and a color conversion assembly according to any of the foregoing embodiments, covering the light emitting surface of the light emitting substrate, wherein the plurality of channels correspond to the plurality of light emitting units, respectively.

In a third aspect, an embodiment of the present invention provides a method for manufacturing a color conversion module, including: providing a substrate; forming a black matrix on a substrate, wherein the black matrix is provided with a plurality of channels which are arranged in an array; forming a light reflecting structure which is in a patterned bulge relative to the inner wall of the channel on the inner wall of at least part of the channel to obtain a grating structure positioned on the inner wall of at least part of the channel; and forming a color conversion layer within at least a portion of the channels, the color conversion layer capable of converting incident light to light having a target color.

According to the color conversion assembly provided by the embodiment of the invention, the light-reflecting grating structure reduces the penetration rate of light penetrating through the wall surface of the channel, so that the light in the channel is reduced to be transmitted to the adjacent channel, and the color cross problem between the channels of the adjacent sub-pixels is reduced. The grating structure can reflect the light which is not completely utilized by the color conversion layer to the color conversion layer again, so that the utilization rate of the incident light is improved, and the light emitting efficiency is improved. And the grating structure is a patterned convex structure, so that the uniformity of emergent light rays in the channel is 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 is a schematic cross-sectional view showing a color conversion module according to a first embodiment of the present invention;

FIG. 2 shows an enlarged schematic view of region A of FIG. 1;

fig. 3 is a schematic cross-sectional view illustrating a display panel according to a first embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view showing a color conversion module according to a second embodiment of the present invention;

fig. 5 is a schematic cross-sectional view illustrating a display panel according to a second embodiment of the present invention;

FIG. 6 is a schematic sectional view showing a color conversion module according to a third embodiment of the present invention;

fig. 7 is a schematic cross-sectional view illustrating a display panel according to a third embodiment of the present invention;

FIG. 8 shows a flow diagram of a method of making a color conversion assembly according to one embodiment of the invention;

FIG. 9a is a schematic cross-sectional view illustrating a step of forming a black matrix in a method of fabricating a color conversion assembly according to an embodiment of the present invention;

FIG. 9b is a schematic cross-sectional view showing a step of forming a grating structure in a method of manufacturing a color conversion element according to an embodiment of the present invention;

FIG. 9c is a schematic cross-sectional structure diagram of a second flat layer step of filling mixed scattering particles in a method of fabricating a color conversion assembly according to an embodiment of the present invention;

FIGS. 9d and 9e are schematic cross-sectional views illustrating a step of forming a color conversion layer in a method of manufacturing a color conversion assembly according to an embodiment of the present invention;

FIG. 9f is a schematic cross-sectional view of a first planarization layer step for forming a hybrid light absorbing material in a method for fabricating a color conversion element according to an embodiment of the present invention.

In the figure:

1000-a display panel;

100-a color conversion component;

110-black matrix; 111-channel; OP1 — first opening; OP2 — second opening;

120-a color conversion layer;

130-a grating structure; 131-an organic layer; 132 — a first reflective layer;

140-a second reflective layer;

151-first distributed bragg reflector layer; 152-a second distributed bragg reflector layer;

160-a transmissive layer;

171-a first planar layer; 172-a second planar layer;

200-a light-emitting substrate; 200 a-a light emitting face;

210-a light emitting unit;

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, and 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 cross-sectional structure of a color conversion module according to a first embodiment of the present invention, and a color conversion module 100 includes a Black Matrix (BM) 110 and a color conversion layer 120.

The black matrix 110 may be formed by means of film pasting, photolithography, laser processing, inkjet printing, 3D printing, screen printing, micro-contact printing, and the like. The black matrix 110 has a plurality of channels 111 arranged in an array, and the arrangement of the plurality of channels 111 matches the arrangement of the pixels of the corresponding display panel. Each passage 111 has a central axis and the shape of the passage 111 can be adapted according to the actual design. Wherein, the cross section of the channel 111 perpendicular to the central axis of the channel 111 may have a shape of a circle, an ellipse, a polygon, etc.; the shape of the cross section of the channel 111 passing through the central axis of the channel 111 may be rectangular, trapezoidal, a shape having arc-like sides, or the like. In the present embodiment, the cross-section of the passage 111 passing through the central axis of the passage 111 has a trapezoidal shape, specifically, an isosceles trapezoidal shape. Herein, the passage 111 may have an axis parallel to its extension direction, the central axis being the axis passing through its geometrical center. In the present embodiment, the central axis of the passage 111 is parallel to the thickness direction of the color conversion member 100.

A color conversion layer 120 is positioned within at least a portion of channel 111, color conversion layer 120 being capable of converting incident light ray L1 to light having a target color, wherein the target color may be different from incident light ray L1. The color conversion layer 120 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.

In some embodiments, incident light ray L1 may be a blue light ray, and color conversion layer 120 is located in at least a portion of channel 111, such as left channel 111 and middle channel 111, respectively, in FIG. 1, that house color conversion layer 120. The color conversion layer 120 in the partial channel 111 can convert the red light, for example, in fig. 1, the color conversion layer 120 in the left channel 111 is a red quantum dot layer, which absorbs the incident light L1 of the blue light and converts the blue light into red light to emit outward. The color conversion layer 120 in the partial channel 111 can convert green light, for example, in fig. 1, the color conversion layer 120 in the middle channel 111 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 the incident light L1 and the color conversion manner of the color conversion layer 120 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 111 houses a color conversion layer 120 therein, wherein the color conversion layer 120 in some of the channels 111 is a layer of quantum dots that convert incident light L1 into red light; the color conversion layer 120 in the partial channel 111 is a quantum dot layer that converts the incident light L1 into green light; the color conversion layer 120 within the partial channel 111 is a quantum dot layer that converts the incident light L1 into blue light. In addition, the color conversion layer 120 is not limited to converting the incident light L1 into red, green, and blue light, and in other embodiments, the color conversion layer 120 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 invention further includes a grating structure 130, and the grating structure 130 is located on at least a part of the inner wall of the channel 111, wherein the grating structure 130 is a light reflecting structure protruding in a patterned manner relative to the inner wall of the channel 111. In some embodiments, the inner wall of each channel 111 is provided with a grating structure 130.

According to the color conversion assembly 100 of the embodiment of the invention, on one hand, the grating structure 130 can reflect light, and reduce the transmittance of light penetrating through the wall surface of the channel 111, thereby reducing the transmission of light in the channel 111 to the adjacent channel 111, and reducing the cross color problem between the channels of the adjacent sub-pixels. On the other hand, the grating structure 130 can reflect the light that is not fully utilized by the color conversion layer 120 to the color conversion layer 120 again, so as to improve the utilization rate of the incident light L1, thereby improving the light extraction efficiency. In another aspect, the grating structure 130 is a patterned convex structure, so that light irradiated to the grating structure 130 is diffracted, thereby improving uniformity of light emitted from the channel 111. Preferably, the grating structure 130 is a structure with a tooth-shaped protrusion, and the structure is regularly distributed, which is beneficial for implementation in a process.

Fig. 2 shows an enlarged schematic view of region a in fig. 1. As shown in fig. 1 and 2, the grating structure 130 may include a patterned organic layer 131 and a first reflective layer 132 covering the organic layer 131. The patterned organic layer 131 is disposed on the inner wall of the channel 111, and the organic layer 131 has a patterned convex structure with respect to the inner wall of the channel 111. In some embodiments, the organic layer 131 has a structure protruding in a tooth shape relative to the inner wall of the channel 111.

In some embodiments, the patterned organic layer 131 is, for example, a patterned organic glue layer. The organic layer 131 facilitates the fixing of the grating structure 130 within the channel 111 and the patterning is easier to achieve. The first reflective layer 132 may be a metal layer, which covers the organic layer 131, thereby forming a light reflecting structure of the tooth-like protrusions of the grating structure 130 together with the organic layer 131, and implementing the light reflecting capability of the grating structure 130.

In the embodiment, the organic layer 131 is a tooth-shaped protrusion, so that the grating structure 130 is a light-reflecting structure that is tooth-shaped protrusion relative to the inner wall of the channel 111, thereby further enhancing diffraction of light and further improving uniformity of light emitted from the channel 111.

It should be noted that the grating structure 130 is not limited to a light reflecting structure that is dentate with respect to the inner wall of the channel 111. In other embodiments, the patterned protrusion structure may be in other forms. For example, the patterned protrusion structure of the grating structure 130 may include a plurality of protrusions protruding from the inner wall of the channel 111, and the plurality of protrusions may be arranged in an array to diffract light. The surfaces of the bumps are made of reflective materials, so that light can be reflected.

In some embodiments, the color conversion assembly 100 further comprises a second reflective layer 140. The second reflective layer 140 may be a metal layer, which is located on the inner wall of the channel 111, and the grating structure 130 is located on the second reflective layer 140.

In the present embodiment, the second reflective layer 140 is formed on the inner wall of the channel 111, the patterned organic layer 131 is disposed on the second reflective layer 140, and the first reflective layer 132 covers the patterned organic layer 131 and a portion of the second reflective layer 140.

As shown in fig. 1, each of the channels 111 has a first opening OP1 and a second opening OP2 opposite to each other, wherein the first opening OP1 is close to the incident light ray L1, and the second opening OP2 is far from the incident light ray L1.

In some embodiments, the size of the second opening OP2 is larger than that of the first opening OP1, and the cross-sectional shape of the channel 111, which is trapezoidal, passing through the central axis of the channel 111 facilitates the reflection of light rays in the outgoing direction, and improves the intensity of the outgoing light.

In some embodiments, the color conversion assembly 100 further comprises a color filter layer covering the second opening OP2 of the channel 111 at least partially accommodating the color conversion layer 120, the color filter layer being capable of allowing light having the target color converted by the color conversion layer 120 in the corresponding channel 111 to pass therethrough and preventing other at least one light having a wavelength range different from that of the target color light from passing therethrough. In some embodiments, the color filter layer can reflect or absorb the incident light L1 not completely absorbed by the color conversion layer 120 in the corresponding channel 111, so as to reduce the incident light L1 mixed in the emergent light, thereby alleviating the problem of poor color gamut in the display.

In the present embodiment, the color filter layer includes a first distributed bragg reflector layer 151, and the first distributed bragg reflector layer 151 is configured to allow the light having the target color converted by the color conversion layer 120 in the corresponding channel 111 to pass therethrough and reflect at least one other light having a wavelength range different from that of the target color light. The first distributed bragg reflector 151 reflects light having the same color as the incident light L1, for example.

Specifically, in the present embodiment, the incident light ray L1 is a blue light ray. The color conversion layer 120 in the left channel 111 is a red quantum dot layer, and correspondingly, the first distributed bragg reflector layer 151 covering the second opening OP2 of the left channel 111 may be configured to allow red light to pass through and reflect blue light. The color conversion layer 120 in the central channel 111 is a green quantum dot layer, and correspondingly, the first distributed bragg reflector layer 151 covering the second opening OP2 of the central channel 111 may be configured to allow green light to pass through and reflect blue light.

By providing the first distributed bragg reflector layer 151, light emitted by the color conversion layer 120 can pass through the first distributed bragg reflector layer 151, while incident light L1 that is not absorbed by the color conversion layer 120 is reflected by the first distributed bragg reflector layer 151 back into the channel 111, re-exciting the color conversion layer 120. The structure enhances the intensity of the converted light of the color conversion assembly 100, and effectively improves the color conversion efficiency and the luminous efficiency of the display panel and the display device comprising the color conversion assembly 100.

In some embodiments, the color conversion assembly 100 further comprises a transmissive layer 160. The transmissive layer 160 is positioned in the channel 111 of the plurality of channels 111 where the color conversion layer 120 is not positioned, and the transmissive layer 160 transmits light having the same color as the incident light L1.

As in fig. 1, in the present embodiment, the right channel 111 accommodates a transmissive layer 160. The incident light L1 is blue light, the transmissive layer 160 allows the blue light to pass through, and the emergent light corresponding to the channel is blue light. In fig. 1, the emergent light of the left channel 111 is red, the emergent light of the middle channel 111 is green, the emergent light of the right channel 111 is blue, and the channel 111 emitting red light, the channel 111 emitting green light, and the channel 111 emitting blue light are arranged in an array, so that full-color display of a picture can be realized.

In some embodiments, the color conversion assembly 100 further includes a second distributed bragg reflector layer 152. The second distributed bragg reflector layer 152 covers at least a portion of the second opening OP2 of the channel 111 not provided with the color conversion layer 120. In this embodiment, the second distributed bragg reflector 152 covers the second opening OP2 of the channel 111 accommodating the transmissive layer 160. The second distributed bragg reflector 152 is configured to allow light of the same color as the incident light L1 to pass therethrough and reflect light of at least one other color. In some embodiments, the second dbr 152 is configured to allow only light with the same color as the incident light L1 to pass through, so as to improve the purity of the light exiting from the corresponding channel 111.

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. 3 shows a schematic cross-sectional structure diagram of a display panel 1000 according to a first embodiment of the present invention. The display panel 1000 includes the light-emitting substrate 200 and the color conversion assembly 100 of the first 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 element 100 covers the light emitting surface 200a of the light emitting substrate 200, wherein the plurality of channels 111 correspond to the plurality of light emitting units 210 respectively. In the present embodiment, each of the light emitting units 210 is a blue LED light emitting unit. In the left channel 111 in fig. 3, 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 and emitted outwards; in the middle channel 111 in fig. 3, 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 111 in fig. 3, the blue light emitted from the blue LED light emitting unit transmits through the transmissive layer 160 to emit the blue light outward. The channels 111 emitting red light, the channels 111 emitting green light and the channels 111 emitting blue light are arranged in an array mode, and full-color display of pictures can be achieved.

According to the display panel 1000 of the embodiment of the invention, the black matrix 110 of the color conversion assembly 100 has a plurality of channels 111 arranged in an array, wherein at least a part of the channels 111 are provided with the grating structure 130, and the grating structure 130 is a light reflecting structure which is a patterned protrusion relative to the inner wall of the channel 111. On one hand, the light-reflecting grating structure 130 reduces the penetration rate of light through the wall surface of the channel 111, thereby reducing the transmission of light in the channel 111 to the adjacent channel 111 and reducing the cross color problem between the channels of the adjacent sub-pixels. On the other hand, the grating structure 130 can reflect the light that is not completely utilized by the color conversion layer 120 to the color conversion layer 120 again, so as to improve the utilization rate of the incident light L1, thereby improving the light extraction efficiency of the display panel 1000. On the other hand, the grating structure 130 is a patterned convex structure, which can diffract the light irradiated to the grating structure 130, thereby improving the uniformity of the light emitted from the channel 111.

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.

As shown in fig. 1 and 3, in some embodiments, the color conversion layer 120 is disposed at the first opening OP1, i.e., at an end of the channel 111 close to the incident light L1 or the light source. The color conversion layer 120 may be provided with a spacing space between the first distributed bragg reflector layer 151. The transmissive layer 160 may also be disposed at the first opening OP1, i.e., at an end of the channel 111 close to the incident light L1 or the light source, and a spacing space is disposed between the transmissive layer and the second distributed bragg reflector 152.

By disposing the color conversion layer 120 at the first opening OP1, the incident light L1 is directly transmitted to the color conversion layer 120 for excitation and color conversion when reaching the color conversion assembly 100, thereby improving the light conversion efficiency to some extent.

The position of the color conversion layer 120 within the channel 111 may not be limited to the examples of the above embodiments, and may be correspondingly disposed at other portions of the channel 111.

Fig. 4 is a schematic cross-sectional structure diagram of a color conversion assembly according to a second embodiment of the present invention, and fig. 5 is a schematic cross-sectional structure diagram of a display panel according to the second embodiment of the present invention. The display panel 1000 of the second embodiment includes a light emitting substrate 200 and the color conversion assembly 100 of the second embodiment. Among them, the light emitted from the plurality of light emitting cells 210 of the light emitting substrate 200 in fig. 5 may be taken as the incident light L1 in fig. 4.

The color conversion module 100 and the display panel 1000 of the second embodiment include substantially the same components, structures and relationships as those of the color conversion module 100 and the display panel 1000 of the first embodiment, and the differences between the second embodiment and the first embodiment will be described below, and the same parts will not be described in detail.

Unlike the first embodiment, the color conversion layer 120 is disposed at the second opening OP2, i.e., at the end of the channel 111 away from the incident light L1 or the light source, and there is a space between the color conversion layer 120 and the first opening OP 1. As shown in fig. 5, in some embodiments, the light emitting units 210 (i.e., light sources) of the light emitting substrate 200 are disposed at the first openings OP1 of the corresponding channels 111. By placing the color conversion layer 120 away from the light source, the influence of the heat generated by the light source on the color conversion layer 120 can be reduced, and the problem of too fast attenuation of the color conversion layer 120 caused by the heat generated by the light source can be avoided.

Fig. 6 is a schematic cross-sectional structure diagram of a color conversion assembly according to a third embodiment of the present invention, and fig. 7 is a schematic cross-sectional structure diagram of a display panel according to the third embodiment of the present invention. The display panel 1000 of the third embodiment includes a light emitting substrate 200 and the color conversion assembly 100 of the third embodiment. Among them, the light emitted from the plurality of light emitting cells 210 of the light emitting substrate 200 in fig. 7 may be taken as the incident light L1 in fig. 6.

The color conversion assembly 100 and the display panel 1000 of the third embodiment include similar components, structures and relationships to those of the color conversion assembly 100 and the display panel 1000 of the first embodiment, and differences between the third embodiment and the first embodiment will be described below, and similar parts will not be described in detail.

The color conversion member 100 includes a color filter layer covering the second opening OP2 of the channel 111 at least partially accommodating the color conversion layer 120, the color filter layer being capable of allowing light having a target color converted by the color conversion layer 120 in the corresponding channel 111 to pass therethrough and preventing other at least one light having a wavelength range different from that of the target color light from passing therethrough. In some embodiments, the color filter layer can reflect or absorb the incident light L1 that is not completely absorbed by the color conversion layer 120 in the corresponding channel 111, and reduce the incident light L1 mixed in the emergent light, thereby alleviating the problem of poor color gamut in the display.

Unlike the first embodiment, in the present embodiment, the color filter layer includes the first planarization layer 171 of a hybrid light absorbing material that absorbs light in the same wavelength range as the incident light L1. The plurality of light emitting units 210 are, for example, blue LED light emitting units 210, the incident light L1 is, for example, blue light, and the light absorbing material absorbs the blue light.

The first planarization layer 171 may be a photoresist and the light absorbing material may be a dye that absorbs blue light, such as a yellow dye. In some embodiments, the light absorbing material contains an azo structure, -SO₃Na, -OH and the like.

According to the color conversion assembly 100 and the display panel 1000 of the embodiment of the invention, the color filter layer is the first flat layer 171 of the mixed light absorption material, so that the first flat layer 171 can absorb the incident light L1 which is not completely absorbed by the color conversion layer 120 in the corresponding channel 111, and the problem of poor color gamut during display is solved. In addition, the light absorbing material is mixed to the first planarization layer 171, thereby realizing the functions of two functional layers through one functional layer, saving process steps. The process steps are saved, namely the photoetching number in the preparation process is reduced, and the cost is reduced. When the color conversion layer 120 is a quantum dot layer, the reduction in the number of photolithography can slow the decay in the performance of the quantum dots.

In the color conversion module 100 of the first embodiment described above, the color filter layer is the first distributed bragg reflector layer 151; in the color conversion member 100 of the third embodiment described above, the color filter layer is the first planarization layer 171 of the mixed light absorbing material. However, the color filter layer may also be of other structures. For example, in some other embodiments, the color filter layer includes a first planarization layer of a hybrid light absorbing material and a first distributed bragg reflector layer. The first planar layer of mixed light absorbing material fills the channel 111 containing the color conversion layer 120, and the light absorbing material absorbs light of the same color as the incident light ray L1. The first distributed bragg reflector 151 is disposed on the first planarization layer 171 corresponding to the second opening OP2 of the channel 111, and the first distributed bragg reflector 151 is configured to allow the light having the target color converted by the color conversion layer 120 in the corresponding channel 111 to pass therethrough and reflect at least one other light having a wavelength range different from that of the light having the target color.

With continued reference to fig. 6 and 7, in the color conversion assembly 100 and the display panel 1000 of the third embodiment, the color conversion assembly 100 further includes a second flat layer 172 mixed with scattering particles, and the second flat layer 172 fills the channels 111 without the color conversion layer 120. By mixing scattering particles in the second flat layer 172, the light emitted from the corresponding channel 111 is more uniform.

The embodiment of the present invention further provides a method for manufacturing a color conversion module, which will be described below by taking the manufacturing process of the color conversion module 100 of the third embodiment as an example.

Fig. 8 is a flowchart illustrating a method of manufacturing a color conversion member 100 according to an embodiment of the present invention, the method including steps S110 to S160.

In step S110, a substrate is provided. It should be noted that, in some embodiments, the substrate may be a light emitting substrate of a display panel; in other embodiments, the color conversion assembly may also be a substrate to be peeled off, and after the complete color conversion assembly is obtained, the substrate to be peeled off may be peeled off and removed, so that the color conversion assembly is combined with the light-emitting substrate of the display panel.

In step S120, a black matrix having a plurality of channels arranged in an array is formed on a substrate.

Fig. 9a is a schematic cross-sectional structure diagram illustrating a step of forming a black matrix in a method of manufacturing a color conversion assembly according to an embodiment of the present invention, where the black matrix 110 may be formed on the substrate 300 by means of film pasting, photolithography, laser processing, inkjet printing, 3D printing, screen printing, micro-contact printing, and the like, where a thickness of the black matrix 110 is 1 to 20 micrometers, an Optical Density (OD) of the black matrix 110 is 4.0 or more, and the black matrix 110 has a plurality of channels 111 arranged in an array.

In step S130, a light reflecting structure protruding in a patterned manner relative to the inner wall of the channel is formed on at least a portion of the inner wall of the channel, so as to obtain a grating structure located on at least a portion of the inner wall of the channel.

Fig. 9b is a schematic cross-sectional structure diagram illustrating a step of forming a grating structure in a method of manufacturing a color conversion element according to an embodiment of the present invention. In some embodiments, the second reflective layer 140 may be formed on the inner wall of at least a portion of the channel 111 before the step of forming the grating structure. Thereafter, the grating structure 130 is formed on the second reflective layer 140.

Wherein the step of obtaining a grating structure located at least partially inside the channel may further comprise: firstly, forming an organic layer on the inner wall of at least part of the channel; then patterning the organic layer, so that the organic layer has a structure which is in a patterned bulge relative to the inner wall of the channel, and in some embodiments, the organic layer has a structure which is in a dentate bulge relative to the inner wall of the channel; thereafter, a first reflective layer is formed on the patterned organic layer.

In step S140, a second flat layer of mixed scattering particles is filled in a portion of the channels.

Fig. 9c is a schematic cross-sectional structure diagram of a second flat layer step of filling the mixed scattering particles in the method for manufacturing a color conversion device according to an embodiment of the invention. The color conversion assembly may be used in a display panel, and the plurality of channels 111 of the color conversion assembly correspond to a plurality of sub-pixels of the display panel, respectively. The plurality of sub-pixels of the display panel include, for example, a red sub-pixel, a green sub-pixel, and a blue sub-pixel. In some embodiments, the channels 111 filled with the second planarization layer may be channels 111 corresponding to blue subpixels. By mixing scattering particles in the second flat layer 172, the light emitted from the corresponding channel 111 is more uniform.

In step S150, a color conversion layer capable of converting incident light into light having a target color is formed in at least a portion of the channels.

Fig. 9d and 9e are schematic cross-sectional structures of steps of forming a color conversion layer in a method of manufacturing a color conversion assembly according to an embodiment of the present invention. The color conversion layer 120 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 120 may be configured into two or more types according to different light emission, for example, the color conversion layer 120 for converting into red light and the color conversion layer 120 for converting into green light may be included. In some embodiments, as shown in fig. 9d, a color conversion layer 120 that converts into red light may be formed within a portion of the channel 111, wherein the channel in which the color conversion layer 120 that converts into red light is formed may be the channel 111 corresponding to the red sub-pixel. Thereafter, as shown in fig. 9e, a color conversion layer 120 converted into green light may be formed in a part of the channels 111, wherein the channel in which the color conversion layer 120 converted into green light is formed may be the channel 111 corresponding to the green sub-pixel. It is understood that the color conversion layer 120 converted into green light may be formed first, and then the color conversion layer 120 converted into red light may be formed.

In step S160, a first planar layer of a mixed light absorbing material is formed on the channel containing the color conversion layer.

FIG. 9f is a schematic cross-sectional view of a first planarization layer step for forming a hybrid light absorbing material in a method for fabricating a color conversion element according to an embodiment of the present invention. The first planarization layer 171 may be a photoresist and the light absorbing material may be a dye that absorbs blue light, such as a yellow dye. In some embodiments, the light absorbing material contains an azo structure, -SO₃Na, -OH and the like.

The first flat layer 171 of the hybrid light absorbing material serves as a color filter layer, and can absorb the incident light L1 that is not completely absorbed by the color conversion layer 120 in the corresponding channel 111, thereby alleviating the problem of poor color gamut during display. In addition, the light absorbing material is mixed to the first planarization layer 171, thereby realizing the functions of two functional layers through one functional layer, saving process steps. The process steps are saved, namely the photoetching number in the preparation process is reduced, and the cost is reduced. When the color conversion layer 120 is a quantum dot layer, the reduction in the number of photolithography can slow the decay in the performance of the quantum dots.

Thus, the color conversion module 100 according to the third embodiment of the present invention is obtained. According to the method for manufacturing the color conversion assembly of the embodiment of the invention, the color conversion assembly 100 is manufactured by forming the grating structure 130 on the inner wall of at least part of the channel 111. On one hand, the light-reflecting grating structure 130 reduces the penetration rate of light through the wall surface of the channel 111, thereby reducing the transmission of light in the channel 111 to the adjacent channel 111 and reducing the cross color problem between the channels of the adjacent sub-pixels. On the other hand, the grating structure 130 can reflect the light that is not completely utilized by the color conversion layer 120 to the color conversion layer 120 again, so as to improve the utilization rate of the incident light, thereby improving the light extraction efficiency. On the other hand, the grating structure 130 is a patterned convex structure, which can diffract the light irradiated to the grating structure 130, thereby improving the uniformity of the light emitted from the channel 111.

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

1. A color conversion assembly, comprising:

a black matrix having a plurality of channels;

a color conversion layer positioned within at least a portion of the channel, the color conversion layer capable of converting incident light to light having a target color; and

the grating structure is positioned on at least part of the inner wall of the channel, wherein the grating structure is a light reflecting structure which is relatively raised in a patterning mode on the inner wall of the channel, and the grating structure comprises: the patterned organic layer is positioned on the inner wall of the channel and is provided with a structure which is in a patterned bulge relative to the inner wall of the channel; and a first reflective layer covering the organic layer.

2. The color conversion assembly of claim 1, further comprising:

and the second reflecting layer is positioned on the inner wall of the channel, and the grating structure is positioned on the second reflecting layer.

3. The color conversion assembly of claim 1, wherein each of said channels has opposing first and second openings, said first opening being proximal to said incident light ray and said second opening being distal to said incident light ray, said color conversion assembly further comprising:

a color filter layer covering the second opening of the channel at least partially accommodating the color conversion layer, the color filter layer being capable of allowing light of a target color corresponding to the conversion of the color conversion layer in the channel to pass therethrough and preventing other at least one light of a wavelength range different from that of the target color light from passing therethrough.

4. The color conversion assembly of claim 3, wherein the color filter layer comprises a first distributed Bragg reflector layer configured to allow light of a target color converted by the color conversion layer within the channel to pass therethrough and reflect at least one other light of a different wavelength range than the target color light;

and/or the color filter layer comprises a first planar layer of a hybrid light absorbing material that absorbs light in the same wavelength range as the incident light.

5. The color conversion assembly of claim 3, wherein the color conversion layer is disposed at the second opening with a spacing space between the color conversion layer and the first opening.

6. The color conversion assembly of claim 1, wherein each of said channels has opposing first and second openings, said first opening being proximal to said incident light ray and said second opening being distal to said incident light ray, said color conversion assembly further comprising:

a second distributed Bragg reflector layer covering at least a portion of the second opening of the channel not provided with the color conversion layer, the second distributed Bragg reflector layer configured to allow light of the same color as the incident light to pass therethrough and to reflect light of at least one other color.

7. The color conversion assembly of claim 1, further comprising:

a second planar layer of mixed scattering particles filling the channels not provided with the color conversion layer.

8. A display panel, comprising:

a light emitting substrate including a plurality of light emitting cells; and

the color conversion member according to any one of claims 1 to 7, which covers a light emitting surface of the light emitting substrate, and a plurality of the channels correspond to a plurality of the light emitting units, respectively.

9. A method of making a color conversion assembly, comprising:

providing a substrate;

forming a black matrix on the substrate, wherein the black matrix is provided with a plurality of channels arranged in an array;

forming a light reflecting structure which is in a patterned bulge relative to the inner wall of the channel on at least part of the inner wall of the channel to obtain a grating structure positioned on at least part of the inner wall of the channel; and

forming a color conversion layer within at least a portion of the channels, the color conversion layer capable of converting incident light to light having a target color.