CN216054697U - Light-emitting substrate and display device - Google Patents

Abstract

A light emitting substrate comprising: the LED module comprises a substrate base plate, a retaining wall and a plurality of LEDs, wherein the retaining wall is arranged on the substrate base plate. The retaining wall isolates a plurality of subareas on the substrate base plate, and at least one subarea is internally provided with at least one light-emitting diode.

Description

Light-emitting substrate and display device

Technical Field

The present disclosure relates to, but not limited to, display technologies, and more particularly, to a light emitting substrate and a display device.

Background

The technology of semiconductor Light Emitting Diodes (LEDs) has been developed for nearly thirty years, from the initial solid-state lighting power supply to the backlight in the display field to the LED display screen, and provides a solid foundation for its wider application. With the development of chip manufacturing and packaging technologies, backlights using micro LEDs with submillimeter level and even micrometer level are widely used.

SUMMERY OF THE UTILITY MODEL

The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

The embodiment of the utility model provides a light-emitting substrate and a display device.

In one aspect, an embodiment of the present invention provides a light emitting substrate, including: the LED module comprises a substrate base plate, a retaining wall and a plurality of LEDs, wherein the retaining wall is arranged on the substrate base plate. The retaining wall isolates a plurality of subareas on the substrate base plate, and at least one subarea is internally provided with at least one light-emitting diode.

In some exemplary embodiments, in two cross sections of the retaining wall parallel to the plane of the base substrate, an area of a cross section close to the base substrate is larger than an area of a cross section far from the base substrate.

In some exemplary embodiments, the material of the retaining wall comprises a light reflecting material.

In some exemplary embodiments, the retaining wall is a net structure including at least one grid surrounding a plurality of adjacent light emitting diodes.

In some exemplary embodiments, in the first plane, a ratio of a distance between adjacent edges of two adjacent light emitting diodes in the first direction to a maximum length of the retaining wall in the first direction is about 4.0 to 5.5. The first plane is perpendicular to the plane where the substrate base plate is located and passes through the center lines of the light emitting surfaces of two adjacent light emitting diodes, and the first direction is parallel to the first plane and is crossed with the center lines of the light emitting surfaces of the light emitting diodes.

In some exemplary embodiments, in the first plane, a ratio between a maximum length of the retaining wall in a second direction parallel to the first plane and crossing the first direction and a maximum length of the retaining wall in the first direction is about 0.5 to 0.8.

In some exemplary embodiments, the light emitting substrate further includes: a light transmissive protective layer covering the plurality of light emitting diodes.

In some exemplary embodiments, the light-transmissive protective layer has a first surface remote from the substrate base plate, and the first surface has a plurality of concave structures.

In some exemplary embodiments, the plurality of concave structures correspond to each of the plurality of light emitting diodes one-to-one, and the orthographic projection of one concave structure on the substrate base plate comprises the orthographic projection of one light emitting diode on the substrate base plate.

In some exemplary embodiments, the concave structure has a hemispherical shape, and the center of the light emitting surface of the light emitting diode is located on a central axis of the hemispherical shape.

In some exemplary embodiments, an orthographic projection of the light-transmitting protective layer on the substrate is partially overlapped with an orthographic projection of the retaining wall on the substrate.

In some exemplary embodiments, the maximum thickness of the light-transmitting protective layer is smaller than the maximum thickness of the retaining wall, wherein the thickness is a distance between a surface of a side far away from the substrate base plate and a surface of a side close to the substrate base plate.

In some exemplary embodiments, the light emitting substrate further includes: and the diffusion film, the color conversion film and the brightness gain film are sequentially arranged on the light-transmitting protective layer along one side far away from the substrate base plate.

In another aspect, an embodiment of the present invention provides a display device, including the light emitting substrate as described above.

Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.

Drawings

The accompanying drawings are included to provide an understanding of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the examples serve to explain the principles of the utility model and not to limit the utility model. The shapes and sizes of one or more of the elements in the drawings are not to scale and are merely illustrative of the principles of the utility model.

Fig. 1 is a schematic plan view of a light-emitting substrate according to at least one embodiment of the utility model;

fig. 2 is a schematic partial cross-sectional view of a light-emitting substrate according to at least one embodiment of the utility model;

FIG. 3 is a schematic diagram of light transmission according to at least one embodiment of the present disclosure;

FIG. 4 is a schematic view of a process for manufacturing a light-emitting substrate according to at least one embodiment of the present disclosure;

FIG. 5A is a schematic view of a light-emitting substrate;

FIG. 5B is a simulation diagram illustrating a dodging effect of the light-emitting substrate shown in FIG. 5A;

fig. 6 is a simulation diagram illustrating a light uniformizing effect of a light-emitting substrate according to at least one embodiment of the present disclosure;

fig. 7 is a schematic view of a display device according to at least one embodiment of the utility model.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Embodiments may be embodied in many different forms. One of ordinary skill in the art will readily recognize the fact that the manner and content may be altered into one or more forms without departing from the spirit and scope of the utility model. Therefore, the present invention should not be construed as being limited to the description of the following embodiments. The embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict.

In the drawings, the size of one or more constituent elements, the thickness of layers, or regions may be exaggerated for clarity. Accordingly, one aspect of the present invention is not necessarily limited to the dimensions, and the shapes and sizes of one or more components in the drawings are not intended to reflect actual proportions. In addition, the drawings schematically show desirable examples, and one embodiment of the present invention is not limited to the shapes, numerical values, and the like shown in the drawings.

The ordinal numbers such as "first", "second", "third", etc. in the present invention are provided to avoid confusion of the constituent elements, and are not limited in number. The "plurality" in the present invention means two or more.

In the present invention, for convenience, terms indicating orientation or positional relationship such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are used to explain positional relationship of constituent elements with reference to the drawings, only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. The positional relationship of the constituent elements is appropriately changed according to the direction in which the constituent elements are described. Therefore, the words described in the specification are not limited to the words described in the specification, and may be replaced as appropriate.

In the present invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly defined or limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The meaning of the above terms in the present invention can be understood by those of ordinary skill in the art as appropriate. Here, "electrically connected" includes a case where constituent elements are connected together by an element having some kind of electrical action. The "element having some kind of electrical action" is not particularly limited as long as it can transmit an electrical signal between connected components. Examples of the "element having some kind of electric function" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, another element having one or more functions, and the like.

In the present invention, "parallel" means a state in which an angle formed by two straight lines is-10 ° or more and 10 ° or less, and therefore, may include a state in which the angle is-5 ° or more and 5 ° or less. The term "perpendicular" means a state in which an angle formed by two straight lines is 80 ° or more and 100 ° or less, and thus may include a state in which an angle is 85 ° or more and 95 ° or less.

In the present invention, "film" and "layer" may be interchanged with each other. For example, the "conductive layer" may be sometimes replaced with a "conductive film". Similarly, the "insulating film" may be replaced with an "insulating layer".

"about" and "approximately" in the present invention refer to the situation where the process and measurement tolerances are not strictly limited.

At least one embodiment of the present invention provides a light emitting substrate, including: the LED module comprises a substrate base plate, a retaining wall and a plurality of LEDs, wherein the retaining wall is arranged on the substrate base plate. The retaining wall isolates a plurality of subareas on the substrate base plate, and at least one subarea is internally provided with at least one light-emitting diode.

The light-emitting substrate provided by the embodiment isolates a plurality of subareas on the substrate through the retaining wall, and divides and isolates a plurality of light-emitting diodes, so that light crosstalk between the subareas can be reduced, the Halo (Halo) phenomenon is reduced, and a better uniform light effect is achieved.

In some exemplary embodiments, the light emitting diode may be a micro Light Emitting Diode (LED). The Micro LEDs may include Micro LEDs (Micro LEDs) and sub-millimeter LEDs (Mini LEDs). However, this embodiment is not limited to this.

In some exemplary embodiments, the light-emitting substrate of the present embodiment may serve as a backlight of a display device. Taking the Light Emitting Diode as an example, because the micro LED has the advantages of small size, high brightness, etc., the image contrast of the Display product using the micro LED backlight can reach the level of an Organic Light-Emitting Diode (OLED) Display product, so that the product can retain the technical advantages of Liquid Crystal Display (LCD), thereby improving the Display effect of the image and providing better visual experience for users.

In some exemplary embodiments, in two cross sections of the retaining wall parallel to the plane of the base substrate, the area of the cross section close to the base substrate is larger than the area of the cross section far from the base substrate. In this example, the cross-sectional area of the retaining wall parallel to the plane of the substrate base plate may gradually decrease in a direction away from the substrate base plate. However, this embodiment is not limited to this.

In some exemplary embodiments, the material of the retaining wall may include a light reflecting material. For example, the material of the retaining wall may be white glue with a reflectivity of more than 95%. The light utilization rate of the light-emitting substrate can be improved by adopting a high-reflectivity material to prepare the retaining wall. However, this embodiment is not limited to this.

In some exemplary embodiments, the retaining wall is a net structure including at least one mesh surrounding a plurality of adjacent light emitting diodes. In this example, one grid may be treated as one partition. However, this embodiment is not limited to this. For example, the retaining wall may include a plurality of strip-like structures that are not continuous.

In some exemplary embodiments, in the first plane, a ratio of a distance between adjacent edges of two adjacent light emitting diodes in the first direction to a maximum length of the blocking wall in the first direction is about 4.0 to 5.5, for example, may be about 4.5. The first plane is perpendicular to the plane of the substrate base plate and passes through the central line of the light-emitting surfaces of the two adjacent light-emitting diodes. The first direction is parallel to the first plane and is crossed with the central line of the light-emitting surface of the light-emitting diode. For example, the first direction is perpendicular to a center line of the light emitting surface of the light emitting diode.

In some exemplary embodiments, in the first plane, a ratio between a maximum length of the retaining wall in the second direction and a maximum length of the retaining wall in the first direction is about 0.5 to 0.8, for example about 0.625. The second direction is parallel to the first plane and intersects the first direction. For example, the second direction is perpendicular to the first direction.

In some exemplary embodiments, the light emitting substrate may further include: and a light-transmitting protective layer. The light-transmitting protective layer covers the plurality of light-emitting diodes. In this example, the protection and encapsulation of the light emitting diode is achieved by covering the light emitting diode with a light transmissive protective layer.

In some exemplary embodiments, the light-transmissive protective layer has a first surface remote from the substrate base plate, and the first surface has a plurality of concave structures. In this example, by forming a plurality of concave structures on the first surface of the light-transmitting protective layer, the light path emitted by the light-emitting diode can be changed to improve the light-homogenizing effect.

In some exemplary embodiments, a plurality of concave structures corresponds one-to-one to each of the plurality of light emitting diodes, and an orthogonal projection of one concave structure on the substrate base includes an orthogonal projection of one light emitting diode on the substrate base.

In some exemplary embodiments, the concave structure has a hemispherical shape, and the center of the light emitting surface of the light emitting diode is located on a central axis of the hemispherical shape. However, this embodiment is not limited to this. For example, the center of the light emitting surface of the led may deviate from the central axis of the hemisphere.

In some exemplary embodiments, an orthographic projection of the light-transmissive protective layer on the base substrate partially overlaps with an orthographic projection of the dam wall on the base substrate. However, this embodiment is not limited to this.

In some exemplary embodiments, the maximum thickness of the light-transmissive protective layer is smaller than the maximum thickness of the dam, wherein the thickness is a distance between a surface of a side away from the substrate base and a surface of a side close to the substrate base.

In some exemplary embodiments, the light emitting substrate may further include: and the diffusion film, the color conversion film and the brightness gain film are sequentially arranged on the light-transmitting protective layer along one side far away from the substrate base plate. However, this embodiment is not limited to this.

The scheme of the present embodiment is illustrated by some examples below.

Fig. 1 is a schematic plan view of a light-emitting substrate according to at least one embodiment of the utility model. Fig. 2 is a partial cross-sectional view of a light-emitting substrate according to at least one embodiment of the utility model. Fig. 2 is a schematic partial cross-sectional view taken along the P-P direction in fig. 1. Fig. 2 is a schematic cross-sectional view of a first plane. The first plane is perpendicular to the plane of the substrate base plate 10 and passes through the center line of the light emitting surfaces of two adjacent light emitting diodes 11. In this example, the first plane is parallel to the row direction of the array of light emitting diodes. However, this embodiment is not limited to this. For example, the first plane may be parallel to a column direction of the light emitting diode array. In some examples, the light emitting diode 11 may be a rectangular parallelepiped, and a light emitting surface of the light emitting diode 11 is a surface away from the substrate 10, and a central line of the light emitting surface is perpendicular to a plane of the substrate 10.

In some exemplary embodiments, as shown in fig. 1 and 2, the light emitting substrate of the present embodiment includes: the light emitting diode comprises a substrate base plate 10, a retaining wall 12 and a plurality of light emitting diodes 11, wherein the retaining wall 12 is arranged on the substrate base plate 10. The dam 12 and the plurality of light emitting diodes 11 are located on the same side of the substrate base plate 10. Fig. 1 only illustrates a plurality of light emitting diodes 11, and the number of light emitting diodes 11 included in the light emitting substrate is not limited in the present embodiment.

In some exemplary embodiments, as shown in fig. 1, the base substrate 10 may include a light-emitting region a1 and a binding region a2 in a plane parallel to the light-emitting substrate. The binding region a2 may be located at one side of the light emitting region a 1. However, this embodiment is not limited to this. For example, the bonding region a2 may be located at multiple sides of the light emitting region a 1. The light emitting region of the base substrate 10 includes a plurality of driving circuits. The driving circuit is connected to the light emitting diode 11 and configured to control the light emitting brightness of the light emitting diode 11. In some examples, the driving Circuit may be a micro Integrated Circuit (micro IC) having a size in the micrometer scale or a pixel Circuit including a Thin Film Transistor (TFT). The bonding region a2 may include a plurality of leads 32 and a bonding pad region 31. One end of at least one wire 32 is connected to the driving circuit of the light emitting region a1, and the other end is connected to a bonding pad in the bonding pad region 31. For example, the bonding pad may be configured to be connected to an external control Circuit through a Flexible Printed Circuit (FPC), and the external control Circuit controls the signal to be supplied to the light emitting diode 11 to realize the light emission of the light emitting diode 11. In some examples, the shape of the light-emitting region a1 may be set as desired, for example, the outline of the light-emitting region a1 may be rectangular. However, this embodiment is not limited to this.

In some exemplary embodiments, the base substrate 10 includes a base and a driving circuit layer. The driving circuit layer is located in a light emitting region of the substrate base plate 10. The substrate may be a rigid substrate (e.g., glass, quartz) or a flexible substrate (e.g., a flexible material such as Polyimide (PI), poly-p-phenylene terephtalate (PET)). The driving circuit layer may include a plurality of driving circuits arranged in an array.

In some exemplary embodiments, the base substrate 10 may be a printed circuit board. However, this embodiment is not limited to this.

In some exemplary embodiments, each of the light emitting diodes 11 included in the light emitting substrate may be controlled in light brightness by a driving circuit on the substrate 10. In some examples, the light emitting substrate may serve as a light source of a passive display panel to improve contrast of a display device to which the light emitting substrate is applied.

In some exemplary embodiments, the plurality of light emitting diodes 11 may be regularly arranged at the light emitting region a1 of the substrate base plate 10. As shown in fig. 1, a plurality of light emitting diodes 11 are arranged in an array in the light emitting region a 1. In fig. 1, the horizontal direction X may be a row direction of the light emitting diode array, and the vertical direction Y may be a column direction of the light emitting diode array. The horizontal direction X is perpendicular to the vertical direction Y. The plurality of light emitting diodes 11 may be connected to a driving circuit on the substrate base 10. For example, a plurality of light emitting diodes 11 are connected in one-to-one correspondence with each of a plurality of driving circuits.

In some exemplary embodiments, as shown in fig. 2, the surface of the base substrate 10 is provided with a light reflecting layer 14. Illustratively, the light-reflective layer 14 may be formed by coating white ink. The light reflecting layer 14 may expose a pad pin of a driving circuit to be connected with the light emitting diode 11 to electrically connect the driving circuit and the light emitting diode 11. In this example, the light reflecting layer 14 may cover the region of the substrate base plate 10 except for the position to be connected with the light emitting diode 11. The light reflecting layer 14 may reflect light toward a side away from the substrate base 10, thereby improving light utilization efficiency. In some examples, the distance between the edge of the light reflecting layer 14 and the edge of the adjacent light emitting diode 11 in a plane perpendicular to the light emitting substrate may be about 150 microns. However, this embodiment is not limited to this.

In some exemplary embodiments, the light emitting direction of the light emitting diode 11 faces the side away from the substrate base plate 10. For example, the light emitting diode 11 may be an inorganic light emitting diode emitting blue light, which may be less than 500 micrometers (um) in size, e.g., may be around 80um to 300um in size. It is understood that the light emitting diode 11 includes a light emitting structure and an electrode lead formed by stacking semiconductor materials, which are not illustrated in a different manner.

Each led 11 can be used as a point light source, and the leds 11 arranged in multiple rows and columns form a surface light source. However, this embodiment is not limited to this. For example, the surface of the led 11 may further include a light conversion material layer disposed on the light emitting side thereof, such as a phosphor layer or a quantum dot film layer, and the phosphor material in the phosphor layer or the quantum dot material in the quantum dot film layer may be excited by blue light to emit light of other colors (e.g., white light).

In some exemplary embodiments, the retaining wall 12 may divide the light emitting region a1 of the light emitting substrate into a plurality of partitions, each of which is provided with at least one light emitting diode 11 therein. As shown in fig. 1, the light emitting region a1 of the substrate board 10 is provided with a plurality of light emitting diodes 11 arranged in an array, and four light emitting diodes 11 arranged in a2 × 2 array may be provided in each partition partitioned by the retaining wall 12. In this example, the same number of light emitting diodes 11 are arranged in a plurality of partitions partitioned by the banks 12. However, this embodiment is not limited to this. For example, the number of the light emitting diodes 11 disposed in the plurality of partitions partitioned by the retaining walls 12 may be different.

In some exemplary embodiments, the material of retaining wall 12 may include a light reflecting material. The retaining wall 12 of this example may have a light reflecting effect, thereby improving the light utilization. However, this embodiment is not limited to this.

In some exemplary embodiments, as shown in fig. 1, retaining wall 12 may be a net structure comprising at least one grid. In this example, a grid is a partition. The number of light emitting diodes 11 enclosed by each grid is not limited, for example, at least one grid surrounds four adjacent light emitting diodes 11. In some examples, the retaining wall 12 may include a plurality of strip structures extending in the horizontal direction X, or may include a plurality of strip structures extending in the vertical direction Y.

In some exemplary embodiments, the light emitting diodes 11 in each partition are surrounded by retaining walls 12, as shown in fig. 1. However, this embodiment is not limited to this. For example, the retaining wall 12 may partially surround at least one light emitting diode 11 to form a partition.

In some exemplary embodiments, in two cross sections of the retaining wall 12 parallel to the plane of the base substrate 10, the area of the cross section close to the base substrate 10 is larger than the area of the cross section far from the base substrate 10. As shown in fig. 2, in the first plane, the length of the retaining wall 12 in the first direction gradually decreases from the base substrate 10 to the side away from the base substrate 10. The first direction is parallel to the first plane and perpendicular to the center line of the light emitting surface of the light emitting diode 11, and the first direction may also be perpendicular to the extending direction of the retaining wall 12. In this example, the first direction is parallel to the horizontal direction X. For example, in the first plane, the surface of the retaining wall 12 on the side away from the substrate base plate 10 may be a circular arc surface. As shown in fig. 2, the retaining wall 12 may have a semicircular cross-sectional shape in the first plane. The side of the retaining wall 12 close to the adjacent light emitting diode 11 may be a cambered surface. However, this embodiment is not limited to this. For example, the wall 12 may have a trapezoidal cross-sectional shape in a first plane. The side of the retaining wall 12 adjacent to the adjacent light emitting diode 11 may be a slope.

In some exemplary embodiments, as shown in fig. 2, in the first plane, the distance between the adjacent edges of two adjacent light emitting diodes 11 in the first direction is W3, the maximum length of the retaining wall 12 in the first direction is W1, and the maximum length of the retaining wall 12 in the second direction Z is H1. The second direction Z is in the same plane as the first direction and perpendicular to the first direction. In this example, the second direction Z is a direction perpendicular to the substrate base plate 10. The distances between the adjacent edges of any two adjacent light emitting diodes in the plurality of light emitting diodes 11 arranged in the array in the first direction are the same. However, this embodiment is not limited to this.

In some examples, the ratio of W3 to W1 may be about 4.0 to 5.5, such as about 4.5; the ratio of H1 to W1 may be about 0.5 to 0.8, for example about 0.625. The size of the retaining wall of the light-emitting substrate provided by the embodiment can achieve a better light-homogenizing effect. However, this embodiment is not limited to this.

In some exemplary embodiments, as shown in fig. 2, the maximum length W1 of wall 12 in the first direction in the first plane may be about 0.72mm to about 0.88mm, for example, about 0.8 mm. The maximum length H1 of retaining wall 12 in second direction Z can be about 0.45mm to about 0.55mm, such as about 0.5 mm. The size of the retaining wall of the light-emitting substrate provided by the embodiment can achieve a better light-homogenizing effect. However, this embodiment is not limited to this.

In some exemplary embodiments, as shown in fig. 1 and 2, a light-transmitting protective layer 13 is covered on the plurality of light emitting diodes 11. In some examples, the orthographic projection of the light-transmitting protective layer 13 on the substrate base plate 10 partially overlaps the orthographic projection of the retaining wall 12 on the substrate base plate 10. For example, the light-transmitting protective layer 13 may be located in a partition isolated by the retaining walls 12, covering the four light-emitting diodes 11 in the partition. As shown in fig. 2, the maximum thickness of the retaining wall 12 in the first plane is the maximum length H1 in the second direction Z. The maximum thickness H2 of the light-transmitting protective layer 13 is smaller than the maximum thickness H1 of the retaining wall 12. In the present invention, the thickness is a distance between a surface on a side away from the base substrate 10 and a surface on a side close to the base substrate 10.

In some exemplary embodiments, as shown in fig. 2, the light-transmissive protective layer 13 has a first surface 130 far from the base substrate 10, and the first surface 130 has a plurality of concave structures 131. As shown in fig. 1, a plurality of concave structures 131 are in one-to-one correspondence with each of the plurality of light emitting diodes 11. I.e. one concave structure 131 corresponds to one led 11. The orthographic projection of the concave structure 131 on the substrate base 10 comprises the orthographic projection of the light-emitting diode 11 on the substrate base 10. In some examples, the orthographic projection of the light emitting diode 11 on the substrate base plate 10 may be rectangular, and the orthographic projection of the concave structure 131 on the substrate base plate 10 may be circular. However, this embodiment is not limited to this. For example, the shapes of the orthographic projections of the light emitting diode 11 and the concave structure 131 on the substrate base plate 10 may be the same.

In some exemplary embodiments, as shown in fig. 2, in the first plane, the surface of the concave structure 131 may be a circular arc surface. For example, the concave structure 131 may be shaped as a hemisphere, and the center of the light emitting surface of the led 11 may be located on the central axis of the hemisphere. However, this embodiment is not limited to this. For example, the center of the light emitting surface of the led 11 may have a deviation from the central axis of the hemisphere.

In some exemplary embodiments, as shown in fig. 2, in the first plane, the length W2 of the concave structure 131 in the first direction may be about 0.72mm to about 0.88mm, for example, may be about 0.8 mm. The maximum thickness H2 of the light-transmissive protective layer 13 may be about 0.36mm to 0.44mm, for example about 0.4 mm. The distance H3 between the plane of the first surface 130 of the light-transmitting protective layer 13 except the concave structures 131 and the surface of the light-emitting diode 11 away from the substrate 10 is about 0.144mm to 0.176mm, for example about 0.16 mm. A gap is left between the concave structure 131 and the led 11. There is a gap between the bottom surface of the concave structure 131 in the second direction Z and the light emitting diode 11, instead of direct contact. The light-transmitting protective layer of the light-emitting substrate can protect the light-emitting diode and simultaneously has a good light-homogenizing effect.

Fig. 3 is a schematic diagram of light transmission according to at least one embodiment of the utility model. In some exemplary embodiments, as shown in fig. 3, a part of the light emitted from the light emitting diode 11 is refracted by the concave structure 131 of the light-transmissive protective layer 13 and then transmitted, and a part of the light is transmitted to the retaining wall 12 through the light-transmissive protective layer 13, and then exits from the light-transmissive protective layer 13 after being reflected by the retaining wall 12, or is transmitted after being reflected by the reflective layer 14. As shown in fig. 3, the concave structure 131 of the light-transmissive protective layer 13 can change the light path emitted by the light-emitting diode 11 (e.g., transmit the light divergently), so as to achieve better light-homogenizing effect. In some examples, the refractive index of the light transmissive protective layer 13 may be about 1.4 to 1.6, for example, about 1.5 or 1.53. However, this embodiment is not limited to this.

In some exemplary embodiments, as shown in fig. 2, the light emitting substrate further includes: a diffusion film 15, a color conversion film 16, and a brightness gain film 117 which are disposed in this order on the side of the light-transmitting protective layer 13 away from the base substrate 10 and in the direction away from the base substrate 10. The color conversion film 16 is located between the diffusion film 15 and the luminance gain film 17. In this example, the diffusion film 15 functions to uniformize light, and can shield light spots formed by the regularly arranged light emitting diodes 11, so that the surface brightness of the light emitting substrate is uniform as a whole. The color conversion film 16 may convert blue light emitted from the light emitting diode 11 into white light. For example, the color conversion film may be a Quantum Dot (QD) film. The brightness gain film 17 can improve the backlight brightness after dodging. For example, the luminance gain film 17 may include at least one of: a prism Film (BEF), and a reflection type polarization Brightness Enhancement Film (DBEF). However, this embodiment is not limited to this. In some examples, the color conversion film may not be provided when the light emitting diode emits white light.

The following is an exemplary description of the manufacturing process of the light emitting substrate. In the exemplary embodiment of the present invention, the "forward projection of a includes the forward projection of B" means that the boundary of the forward projection of B falls within the boundary range of the forward projection of a, or the boundary of the forward projection of a overlaps the boundary of the forward projection of B.

In some exemplary embodiments, as shown in fig. 4, the preparation process of the light emitting substrate may include the following operations.

(1) And preparing the substrate base plate.

In some exemplary embodiments, a substrate is provided and a driving circuit layer is formed on the substrate, and then white ink is applied on the driving circuit layer to form the light reflecting layer 14. The driving circuit layer may include a plurality of driving circuits. In some examples, the substrate may be a rigid substrate or a flexible substrate. In some examples, the light reflection layer 14 may be formed on the substrate base 10 between adjacent two light emitting diodes by a coating process, exposing pad pins to be connected with electrode pins of the light emitting diodes 11. In the present exemplary embodiment, by forming the light reflecting layer 14 on the base substrate 10, the light utilization efficiency of the light emitting diode 11 can be improved, thereby improving the luminance of the light emitting substrate. In addition, when the brightness requirement is constant, a light emitting diode with low brightness can be selected, and the power consumption of the light emitting substrate can be reduced.

(2) And transferring the plurality of light emitting diodes to the substrate base plate.

In some exemplary embodiments, the mass transfer of the inorganic light emitting diodes onto the substrate base 10 may be performed by a mass transfer technique. In some examples, the electrode leads of the inorganic light emitting diode may be bonded to the pad leads exposed from the light reflecting layer 14 on the substrate base 10 by a conductive substance such as solder, silver paste, or the like.

In some examples, each of the light emitting diodes 11 disposed on the base substrate 10 may be regarded as a point light source. The substrate 10 is provided with a plurality of light emitting diodes 11 arranged in a plurality of rows and columns to form a surface light source.

(3) Forming the retaining wall.

In some exemplary embodiments, the dam 12 may be formed on the substrate base plate 10 by a dispensing or printing process. In some examples, the material of the retaining wall 12 may be a glue material with high reflectivity (e.g., reflectivity greater than 95%), such as silicone, epoxy, acrylic, and the like. However, this embodiment is not limited to this.

(4) And forming a light-transmitting protective layer.

In some exemplary embodiments, the light-transmissive protective layer 13 is formed in the partitioned areas isolated by the retaining walls 12 by using a dispensing or pouring process. The light-transmitting protective layer 13 covers the light emitting diodes 11 to protect the light emitting diodes 11 from scratching the crystals of the light emitting diodes 11. The maximum thickness of the light-transmitting protective layer 13 may be smaller than the maximum thickness of the retaining wall 12.

In some exemplary embodiments, a plurality of concave structures 131 may be formed on the first surface 130 of the light-transmissive protective layer 13 away from the substrate 10 by molding, transferring, stamping, etc. to change the light path emitted by the light-emitting diode 11, so as to achieve better light-homogenizing effect. In some examples, the concave structures 131 may be hemispherical in shape. However, this embodiment is not limited to this.

In some exemplary embodiments, the light-transmissive protective layer 13 may be made of silicone, epoxy, acrylic, or the like. The light transmittance of the light-transmitting protective layer 13 may reach 99%.

(5) And a diffusion film, a color conversion film and a brightness gain film are sequentially disposed.

In some exemplary embodiments, the diffusion film 15, the color conversion film 16, and the luminance gain film 17 may be sequentially provided on the side of the light-transmitting protective layer 13 away from the base substrate 10. The diffusion film 15, the color conversion film 16, and the luminance gain film 17 may cover the light-emitting region of the base substrate 10. In some examples, the diffusion film 15 may be made of a material having a light-uniformizing function to shield the light spot formed by the light emitting diode 11 so that the surface brightness is uniform as a whole. The color conversion film 16 may convert blue light emitted from the light emitting diode 11 into white light. The brightness enhancement film 17 may be a prism film for enhancing brightness after the light uniformization.

The preparation process of the light-emitting substrate provided by the exemplary embodiment of the utility model can be well compatible with the existing preparation process, and has the advantages of simple process implementation, easiness in implementation, high production efficiency, low production cost and high yield.

Fig. 5A is a schematic structural diagram of a light-emitting substrate in the related art. The light-emitting substrate shown in fig. 5A includes: a base substrate 20, a plurality of light emitting diodes 21 provided on the base substrate 20, a protective layer 23 covering the plurality of light emitting diodes 21, a diffusion film 25, a color conversion film 26, and a luminance gain film 27 provided in this order on the side of the protective layer 23 away from the base substrate 20. The surface of the base substrate 20 is provided with a light reflecting layer 24. The protective layer 23 has a convex curved surface structure. The light emitting diode 21 of the light emitting substrate shown in fig. 5A is covered by the protective layer 23 having a convex structure, and no retaining wall is disposed on the substrate 10. Fig. 5B is a simulation diagram illustrating a dodging effect of the light-emitting substrate shown in fig. 5A. The luminance uniformity of the light emitting substrate shown in fig. 5A is about 72.5%.

Fig. 6 is a simulation diagram illustrating a light uniformizing effect of a light emitting substrate according to at least one embodiment of the utility model. As shown in fig. 6, the brightness uniformity of the light-emitting substrate of the present embodiment can reach 85.4%. Referring to fig. 5B and fig. 6, it can be seen that the brightness uniformity of the light-emitting substrate of the embodiment is significantly improved, and the light-homogenizing effect can be improved.

At least one embodiment of the present invention also provides a display device including the light emitting substrate of the foregoing exemplary embodiment.

Fig. 7 is a schematic view of a display device according to at least one embodiment of the utility model. As shown in fig. 7, the display device of the present embodiment may include: a light emitting substrate 1 and a display panel 2. The display panel 2 is located on the light-emitting side of the light-emitting substrate 1. In this example, the light emitting substrate 1 may serve as a direct type backlight of the display panel 2. The display panel 2 may be an LCD display panel.

The drawings in the present application relate only to the structures to which the present invention pertains and other structures may be referred to as in the general design. Without conflict, embodiments of the present invention and features of the embodiments may be combined with each other to arrive at new embodiments.

It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it is intended to cover the appended claims.

Claims (13)

1. A light-emitting substrate, comprising:

the LED light source comprises a substrate base plate, a retaining wall and a plurality of LEDs, wherein the retaining wall is arranged on the substrate base plate; the retaining wall isolates a plurality of subareas on the substrate base plate, and at least one subarea is internally provided with at least one light-emitting diode;

in the first plane, the ratio of the distance between the adjacent edges of the two adjacent light-emitting diodes in the first direction to the maximum length of the retaining wall in the first direction is 4.0-5.5; the first plane is perpendicular to the plane where the substrate base plate is located and passes through the center lines of the light emitting surfaces of two adjacent light emitting diodes, and the first direction is parallel to the first plane and is crossed with the center lines of the light emitting surfaces of the light emitting diodes.

2. The light-emitting base plate of claim 1, wherein in two cross sections of the retaining wall parallel to the plane of the base plate, the area of the cross section close to the base plate is larger than the area of the cross section far from the base plate.

3. The light-emitting substrate according to claim 1, wherein the material of the retaining wall comprises a light-reflecting material.

4. The light-emitting substrate according to claim 1, wherein the retaining wall is a mesh structure, and the mesh structure comprises at least one mesh surrounding a plurality of adjacent light-emitting diodes.

5. The light-emitting substrate according to claim 1, wherein in the first plane, a ratio of a maximum length of the retaining wall in the second direction to a maximum length of the retaining wall in the first direction is 0.5 to 0.8, and the second direction is parallel to the first plane and intersects with the first direction.

6. The light-emitting substrate according to any one of claims 1 to 5, further comprising: a light transmissive protective layer covering the plurality of light emitting diodes.

7. The light-emitting substrate according to claim 6, wherein the light-transmissive protective layer has a first surface far from the substrate base plate, and the first surface has a plurality of concave structures.

8. The light-emitting substrate according to claim 7, wherein the plurality of concave structures correspond to each of the plurality of light-emitting diodes one-to-one, and the orthogonal projection of one concave structure on the substrate comprises an orthogonal projection of one light-emitting diode on the substrate.

9. The light-emitting substrate according to claim 8, wherein the concave structure is shaped like a hemisphere, and a center of a light-emitting surface of the light-emitting diode is located on a central axis of the hemisphere.

10. The light-emitting substrate according to claim 6, wherein an orthographic projection of the light-transmitting protective layer on the substrate is partially overlapped with an orthographic projection of the retaining wall on the substrate.

11. The light-emitting substrate according to claim 6, wherein the maximum thickness of the light-transmitting protective layer is smaller than the maximum thickness of the retaining wall, and the thickness is a distance between a surface of a side away from the substrate and a surface of a side close to the substrate.

12. The light-emitting substrate according to claim 6, further comprising: and the diffusion film, the color conversion film and the brightness gain film are sequentially arranged on the light-transmitting protective layer along one side far away from the substrate base plate.

13. A display device comprising the light-emitting substrate according to any one of claims 1 to 12.

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