CN116339015A - Light-emitting panel and display device - Google Patents

Abstract

The present application relates to a light-emitting panel and a display device. The light-emitting panel includes: a driving substrate, including a plurality of rectangular partitions arranged in an array and connected in sequence, and the end points of the plurality of rectangular partitions form first nodes and second nodes alternately arranged along the row direction and the column direction; and a plurality of light-emitting components , arranged one-to-one at a plurality of first nodes of the driving substrate, the light-emitting assembly includes a light-emitting element and a light-diffusing structure arranged around the light-emitting element, and the light-diffusing structure is used to emit the light emitted by the light-emitting element The sides are diffused by multiple rectangular partitions. The luminous panel can increase the luminance radiation range of a single luminous element, and can reduce the number of luminous elements used and cost while achieving high partition.

Description

Light emitting panel and display device

technical field

The present application relates to the field of display technology, in particular to a light-emitting panel and a display device.

Background technique

The liquid crystal display panel itself does not emit light, and a backlight module needs to be installed to provide it with sufficient brightness and uniformly distributed light source so that it can display images normally. The number of partitions of the backlight module determines the display effect of the LCD panel to a large extent. The more partitions, the better the dynamic dimming effect, and the better the details of light and dark can be displayed. However, the current way to increase the number of partitions in the industry is generally to increase the number of light-emitting elements, and tend to the way of one light per area (that is, each light-emitting element independently controls the brightness). However, increasing the number of light emitting elements greatly increases the manufacturing cost.

Contents of the invention

The present application aims to provide a light-emitting panel and a display device, which can expand the range of brightness radiation of a single light-emitting element, reduce the number of light-emitting elements used and reduce costs while achieving high partition.

In the first aspect, the embodiment of the present application proposes a light-emitting panel, including: a driving substrate, including a plurality of rectangular partitions arranged in an array and connected in sequence. A node and a second node; and a plurality of light-emitting components, one-to-one arranged at a plurality of first nodes of the drive substrate, the light-emitting component includes a light-emitting element and a light-diffusing structure arranged around the light-emitting element, and the light-emitting structure is used to emit light The light emitted by the element exits along the light emitting direction and diffuses along the multiple rectangular partitions on its peripheral side.

In a possible implementation manner, the light-diffusing structure includes: a surrounding wall disposed on the outer peripheral side of the light-emitting element; a first transparent encapsulant covering the light-emitting element; and a second transparent encapsulant covering the first transparent encapsulant and filling in the Between the wall and the first transparent encapsulant, the refractive index of the second transparent encapsulant is higher than that of the first transparent encapsulant.

In a possible implementation manner, the first transparent encapsulant includes a first encapsulation part and a second encapsulation part arranged in sequence along the light-emitting direction of the light-emitting element, the first encapsulation part is a column covering the light-emitting element, and its height is less than that of the surrounding wall 1/2 of the height; the second encapsulation part is an arcuate body covering the first encapsulation part, and its apex is lower than the height of the surrounding wall.

In a possible implementation manner, the first transparent encapsulant has a refractive index n1<1.2, and the second transparent encapsulant has a refractive index n2>1.6.

In a possible implementation manner, the height of the second transparent encapsulant is equal to the height of the surrounding wall.

In a possible implementation manner, the second transparent encapsulant is filled with a scattering material for scattering light.

In a possible implementation manner, the light emitting element is a micro light emitting diode or a submillimeter light emitting diode.

In a possible implementation manner, the surface of the driving substrate along the light emitting direction is coated with a first reflective layer, and the orthographic projection of the first reflective layer on the driving substrate does not overlap with the orthographic projection of the light emitting component on the driving substrate.

In a possible implementation manner, the surface of the fence is coated with a second reflective layer.

In the second aspect, the embodiment of the present application also provides a display device, including the aforementioned light emitting panel.

According to the light-emitting panel and the display device provided by the embodiments of the present application, the light-emitting panel includes: a driving substrate, including a plurality of rectangular partitions arranged in an array and connected in sequence, and the endpoints of the plurality of rectangular partitions form the first row and column directions alternately arranged respectively. A node and a second node; and a plurality of light-emitting components, which are arranged one-to-one on a plurality of first nodes of the circuit-driving substrate. The light-emitting component includes a light-emitting element and a light-diffusing structure arranged around the light-emitting element. The light emitted by the light-emitting element exits along the light-emitting direction and diffuses along the multiple rectangular partitions on its peripheral side. Thus, the luminance radiation range of a single light-emitting element can be expanded. When any one of the light-emitting elements fails to light up, by controlling the brightness of multiple normal light-emitting elements around the faulty light-emitting element, the brightness of the surrounding side of the faulty device can be realized. The dynamic dimming effect of multiple rectangular partitions can reduce the number of light-emitting elements used while achieving high partitions, greatly reducing costs and failure rates.

Description of drawings

The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the figures, the same parts are given the same reference numerals. The attached drawings are not drawn in accordance with the actual scale, and are only used to illustrate the relative positional relationship. The layer thickness of some parts is drawn in an exaggerated way for easy understanding. The layer thickness in the attached drawing does not represent the proportional relationship of the actual layer thickness.

FIG. 1 shows a schematic top view of a light-emitting panel provided in the first embodiment of the present application;

Fig. 2 shows the structure and optical path schematic diagram of the light-emitting assembly in Fig. 1;

FIG. 3 shows a schematic top view of the light-emitting panel provided by the second embodiment of the present application;

FIG. 4 shows a schematic structural diagram of a display device provided by a third embodiment of the present application.

Explanation of reference signs:

1. Luminous panel;

10. Drive substrate; AA, rectangular partition; 101, first node; 102, second node; 103, first reflective layer;

11. Light-emitting component; 111. Light-emitting element; 112. Light-diffusing structure; 1121. First transparent encapsulation; F1. First encapsulation; F2. Second encapsulation; 1122. Second transparent encapsulation; 1123. Wall; 1124. The second reflective layer;

100, a backlight module; 110, a back panel; 120, an optical component; 200, a liquid crystal display panel.

Detailed ways

Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least some well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of domain structures may have been exaggerated. Furthermore, the features, structures, or characteristics described hereinafter may be combined in any suitable manner in one or more embodiments.

first embodiment

FIG. 1 shows a schematic top view of the light-emitting panel provided by the first embodiment of the present application; FIG. 2 shows the structure and optical path of the light-emitting assembly in FIG. 1 .

As shown in FIG. 1 and FIG. 2 , the first embodiment of the present application proposes a light emitting panel 1 including a driving substrate 10 and a plurality of light emitting components 11 .

The driving substrate 10 includes a plurality of rectangular subregions AA arranged in an array and connected in sequence, and the end points of the plurality of rectangular subregions AA form first nodes 101 and second nodes 102 arranged alternately along the row direction and the column direction, respectively.

A plurality of light-emitting components 11 are arranged one-to-one at multiple first nodes 101 of the driving substrate 10. The light-emitting component 11 includes a light-emitting element 111 and a light-diffusing structure 112 arranged around the light-emitting element 111. The light-diffusing structure 112 is used to make the light-emitting element The light emitted by 111 exits along the light emitting direction and diffuses along a plurality of rectangular partitions AA on its peripheral side. Four rectangular partitions AA are arranged on the peripheral side of each light emitting assembly 11 .

Optionally, the driving substrate 10 is a hard printed circuit board (PCB), and the light emitting element 111 is soldered to the hard printed circuit board. Optionally, the driving substrate 10 is a glass substrate, and the light-emitting element 111 adopts COB (Chips on Board) or COG (Chips on Glass) technology, is adhered to the driving substrate 10 by conductive glue or non-conductive glue, and then performs wire bonding To achieve electrical connection, no brackets, gold wires, etc. are required, and less materials are used, which can reduce the number of reflows in the manufacturing process and avoid the risk of secondary reflows. The light emitting element 111 may be a blue light chip whose main wavelength is in the range of 440nm-470nm.

As shown in FIG. 1 , the drive substrate 10 includes a plurality of rectangular subregions AA distributed in an array and connected in sequence, and the endpoints of the plurality of rectangular subregions AA form first nodes 101 and second nodes 102 alternately arranged along the row direction and the column direction, respectively, A plurality of light-emitting components 11 are arranged one-to-one at multiple first nodes 101 of the driving substrate 10, and the light emitted by each light-emitting component 11 can be radiated to four rectangular partitions AA around it, so that each rectangular partition AA The brightness can be obtained by superimposing the radiated light of the two light emitting assemblies 11 distributed diagonally, thereby improving the overall brightness of the backlight module 100 . Since the light-emitting components 11 are only arranged at some nodes on the driving substrate 10, and the total number of rectangular partitions AA remains unchanged, compared with the technical solution in the related art where each rectangle AA is correspondingly provided with a light-emitting element 111, the reduction is greatly reduced. The number of light emitting elements 111 is beneficial to reduce the cost.

Further, when any of the light-emitting elements 111 fails to light up, the four rectangular partitions AA around the faulty light-emitting element 111 can be lighted up by the adjacent four light-emitting elements 111 working normally on the side of the faulty light-emitting element 111, and the control The luminance of the four light-emitting elements 111 in normal operation, for example, by increasing the luminance to keep it as consistent as possible with the luminance during normal operation, can realize the dynamic dimming effect of the four rectangular partitions AA around the faulty device, without It will affect the overall luminous effect of the luminous panel 1 and greatly reduce the failure rate.

Take the black-shaded faulty light-emitting element marked as E in Figure 1 as an example, when the faulty light-emitting element E is off, the four rectangular partitions AA around it are in a dark state. However, since the four light-emitting elements M1-M4 around the faulty light-emitting element E emit light normally, the light emitted by each of the light-emitting elements M1-M4 can be irradiated to the four rectangular partitions AA in one-to-one correspondence to avoid a dark state, and control the light-emitting elements The luminous brightness of M1-M4 can realize the dynamic dimming effect of the four rectangular partitions AA on the side of the faulty light-emitting element E, making it as consistent as possible with the brightness during normal operation, so as not to affect the overall luminescence of the light-emitting panel 1 Effect.

The light-emitting panel 1 provided according to the embodiment of the present application includes a driving substrate 10 and a plurality of light-emitting components 11. The driving substrate 10 includes a plurality of rectangular partitions AA distributed in an array and connected in sequence. The first nodes 101 and the second nodes 102 are arranged alternately in the column direction; a plurality of light-emitting components 11 are arranged one-to-one at a plurality of first nodes 101 of the driving substrate 10; the light-emitting components 11 include light-emitting elements 111 and surrounding light-emitting elements 111 is provided with a light-diffusing structure 112. The light-diffusing structure 112 is used to emit the light emitted by the light-emitting element 111 along the light-emitting direction and diffuse along a plurality of rectangular partitions AA around it. Thus, the range of brightness radiation of a single light-emitting element 111 can be expanded. When any one of the light-emitting elements 111 fails to light up, by controlling the brightness of a plurality of normal light-emitting elements 111 around the faulty light-emitting element 111, the failure can be realized. The dynamic dimming effect of multiple rectangular partitions AA around the side of the light emitting element 111 can reduce the number of light emitting elements 111 used while achieving high partition, greatly reducing the cost and failure rate.

The specific structure of the light-emitting panel 1 provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

In some embodiments, the light-diffusing structure 112 includes a first transparent encapsulant 1121 , a second transparent encapsulant 1122 and a surrounding wall 1123 .

The surrounding wall 1123 is arranged on the outer peripheral side of the light-emitting element 111, the first transparent encapsulant 1121 covers the light-emitting element 111, the second transparent encapsulant 1122 covers the first transparent encapsulant 1121 and fills between the enclosing wall 1123 and the first transparent encapsulant 1121, Wherein, the refractive index of the second transparent encapsulant 1122 is higher than that of the first transparent encapsulant 1121 .

Optionally, the material of the first transparent encapsulation glue 1121 or the second transparent encapsulation glue 1122 may be ultraviolet light curing glue (UV glue) or heat curing glue. Optionally, the first transparent encapsulant 1121 has a refractive index n1<1.2, and the second transparent encapsulant 1122 has a refractive index n2>1.6. According to the principle of refraction, the light will be refracted when it passes through the interface of the first transparent encapsulant 1121 with a low refractive index and the second transparent encapsulant 1122 with a high refractive index, and the refracted light will diffuse outwards so that it can cover the luminous The plurality of rectangular subregions AA on the peripheral side of the element 111 realizes the luminous effect that one light emitting element 111 radiates a plurality of rectangular subregions AA.

As shown in FIG. 2 , the light emitted by the light-emitting element 111 can be divided into three parts: the first light L1 directly passes through the first transparent encapsulant 1121 and the second transparent encapsulant 1122 and collimates; the second light L2 passes through The interface between the first transparent encapsulant 1121 and the second transparent encapsulant 1122 of the refractive index refracts and spreads out to the surroundings, thereby expanding the light coverage of the light emitting element 111; the third light L3 is reflected after passing through the wall 1123, And focus on the top of the light emitting element 111 to further improve the luminous brightness. In this way, one light-emitting element 111 can achieve a light-diffusing effect covering a plurality of rectangular partitions AA. While achieving high partitions, the number of light-emitting elements 111 used can be reduced, and the cost and failure rate are greatly reduced.

In some embodiments, the first transparent encapsulant 1121 includes a first encapsulation part F1 and a second encapsulation part F2 sequentially arranged along the light-emitting direction of the light-emitting element 111, the first encapsulation part F1 is a cylinder covering the light-emitting element 111, and The height is less than 1/2 of the height of the surrounding wall 1123 ; the second encapsulation part F2 is an arcuate body covering the first encapsulation part F1 , and its apex is lower than the height of the enclosing wall 1123 .

As shown in FIG. 2 , the first transparent encapsulant 1121 includes a first encapsulation part F1 and a second encapsulation part F2 arranged in sequence along the light-emitting direction of the light-emitting element 111. The cylindrical structure of the first encapsulation part F1 allows light to pass through the surrounding wall 1123. Afterwards, it is reflected back directly above the light-emitting element 111 to improve the luminous brightness. The height of the first encapsulation part F1 is less than 1/2 of the height of the enclosure wall 1123, which can increase the height of the second encapsulation part F2. Refraction will occur at the interface between the surface body and the second transparent encapsulant 1122 , and the refracted light will diffuse to the surroundings to expand the light coverage of the light emitting element 111 . The apex of the second encapsulation part F2 is lower than the height of the enclosure wall 1123. When some light rays pass through the interface between the arcuate body and the second transparent encapsulant 1122, the refracted light can be reflected after reaching the enclosure wall 1123, and concentrated toward the light emitting element 111. directly above, further improving the luminous brightness of the light-emitting panel 1 .

In some embodiments, the height of the second transparent encapsulant 1122 is equal to the height of the surrounding wall 1123 . With such arrangement, the light emitted by the light-emitting element 111 can be emitted forward along the light-emitting direction on the one hand, and diffused along the multiple rectangular partitions AA on its surrounding sides, ensuring uniform visual effects and improving light utilization efficiency.

In some embodiments, the second transparent encapsulant 1122 is filled with a scattering material for scattering light. Such arrangement can further increase the light coverage of the light emitting element 111 .

In some embodiments, the light emitting element 111 is a micro light emitting diode (Micro-LED) or a submillimeter light emitting diode (Mini-LED). The light-type energy distribution of the light-emitting element 111 is a Lambertian-type distribution, and the light energy in the center of the light-emitting element 111 is the largest. Among them, Micro-LED refers to LED chips with a grain size of less than 200 microns, and Mini-LED refers to LED chips with a grain size of about 200-300 microns. Mini-LED or Micro-LED can be used as a self-luminous light-emitting element display, which has the advantages of low power consumption, high brightness, high resolution, high color saturation, fast response, long life, and high efficiency.

Optionally, the light-emitting element 111 is manufactured on the driving substrate 10 by means of mass transfer. Combination of engraving and graphic transfer. In addition, the term "Micro-LED" or "Mini-LED" refers to the general designation of the entire light-emitting structure formed in various steps of manufacturing the light-emitting element 111, including all layers or area.

In some embodiments, the surface of the driving substrate 10 along the light emitting direction is coated with a first reflective layer 103, and the orthographic projection of the first reflective layer 103 on the driving substrate 10 is different from the orthographic projection of the light emitting component 11 on the driving substrate 10. overlap.

Optionally, the aperture of the first reflective layer 103 is larger than the peripheral size of the light emitting component 11 . Taking the driving substrate 10 as a PCB as an example, its reflectivity is generally below 85% after ink is sprayed. In order to increase light utilization efficiency, a first reflective layer 103 is added on the driving substrate 10. The first reflective layer 103 is a sheet structure or is formed by spraying a reflective material. The sprayed reflective material can be, for example, but not limited to BaSO4, TiO2 or organic Silicon ZnS, etc., the reflectivity can reach 99%.

Therefore, when the light emitted from the light-emitting component 11 reaches the first reflective layer 103 on the side of the driving substrate 10 , most of the light can be reflected to the side of the light-emitting direction, further improving light utilization efficiency.

second embodiment

FIG. 3 shows a schematic top view of the light-emitting panel provided by the second embodiment of the present application.

As shown in FIG. 3 , the structure of the light-emitting panel provided by the second embodiment of the present application is similar to that of the first embodiment, except that the surface of the surrounding wall 1123 is coated with a second reflective layer 1124 . The second reflective layer 1124 can be formed by spraying a reflective material, such as but not limited to BaSO4, TiO2, organic silicon, ZnS, etc., to further improve the reflectivity of the third light L3 after passing through the wall 1123, making it more Concentrate toward directly above the light emitting element 111 to further increase the luminous brightness.

third embodiment

FIG. 4 shows a schematic structural diagram of a display device provided by a third embodiment of the present application.

As shown in FIG. 4 , the third embodiment of the present application also proposes a display device, including the aforementioned light-emitting panel 1 .

In one example, the display device is a liquid crystal display module, including a liquid crystal display panel 200 and a backlight module 100 disposed on the backlight side of the liquid crystal display panel 200. Since the liquid crystal display panel 200 itself does not emit light, it is necessary to set the backlight module 100 as It provides a light source with sufficient brightness and uniform distribution so that it can display images normally. The backlight module 100 is used for providing light source to the liquid crystal display panel 200 . The backlight module 100 includes a backplane 110 , the aforementioned light-emitting panel 1 and an optical component 120 .

The material of the back plate 110 may be a metal material, such as any one of aluminum plate, aluminum alloy plate or galvanized steel, which is made by stamping and other processes. The metal material has better ductility, which can protect the backlight module 100 from breaking under the impact of external force. The material of the back plate 110 can also be a plastic material, such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene, etc., so as to reduce the weight of the backlight module 100 and reduce the backlight intensity. The cost of the mod 100.

The light emitting panel 1 is located on the back plate 110 , and the optical assembly 120 is located on a side of the light emitting panel 1 away from the back plate 110 . The optical component 120 may include, for example but not limited to, a dodging plate, a prism structure on the light emitting surface side of the dodging plate, etc., so as to further improve the overall display effect of the backlight module 100 . Among them, the inside of the homogeneous plate can be provided with bubbles or microporous structures, which have super high reflectivity for incident light energy, so as to delay the light emission, obtain a larger optical path, and achieve the effect of uniform light emission. The backlight surface of the uniform light plate is provided with orange peel-like fine structures, which are used to form a diffuse reflection surface, clutter the light, and prevent the light from directly exiting the light-emitting surface, which can improve the light efficiency.

The liquid crystal display panel 200 includes an array substrate and a color filter substrate disposed opposite to each other, and a liquid crystal layer disposed between the array substrate and the color filter substrate. The liquid crystal layer includes a plurality of liquid crystal molecules. The liquid crystal molecules are usually rod-shaped, and can flow like a liquid. It also has some crystal characteristics. When the liquid crystal molecules are placed in an electric field, their alignment direction will change according to the change of the electric field.

Further, the display device further includes an upper polarizer on the light emitting side of the liquid crystal display panel 200 and a lower polarizer on the backlight side of the liquid crystal display panel 200 . The lower polarizer and the upper polarizer may polarize incident light of the liquid crystal display panel 200 to allow transmission of light vibrating in only one direction.

In another example, the display device is a direct-display LED display, which includes the light-emitting panel 1 and the display body as described above.

It should be readily understood that "on", "above" and "above" in this application should be interpreted in the broadest manner such that "on" means not only " directly on something", also includes the meaning of "on something" with intermediate features or layers in between, and "above" or "over" not only includes "on something" or " The meaning of "over" may also include the meaning of "above" or "over" without intervening features or layers (ie, directly on something).

The term "layer" as used herein may refer to a portion of material comprising a region having a certain thickness. A layer may extend over the entirety of the underlying or overlying structure, or may have an extent that is less than the extent of the underlying or overlying structure. Furthermore, a layer may be a region of a homogeneous or non-homogeneous continuous structure having a thickness less than the thickness of the continuous structure. For example, a layer may be located between the top and bottom surfaces of the continuous structure or between any pair of transverse planes at the top and bottom surfaces. Layers may extend laterally, vertically and/or along the tapered surface.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims (10)

1. A light-emitting panel, comprising:

the driving substrate comprises a plurality of rectangular partitions which are distributed in an array and are sequentially connected, and the endpoints of the rectangular partitions form a first node and a second node which are alternately arranged along the row direction and the column direction respectively; and

the light emitting components are arranged at the first nodes in a one-to-one correspondence mode, the light emitting components comprise light emitting elements and light expanding structures arranged around the light emitting elements, and the light expanding structures are used for emitting light rays emitted by the light emitting elements along the light emitting direction and diffusing along a plurality of rectangular subareas on the periphery of the light emitting elements.

2. The light emitting panel of claim 1, wherein the light spreading structure comprises:

a wall provided on the outer peripheral side of the light emitting element;

a first transparent encapsulation adhesive covering the light emitting element; and

and the second transparent packaging glue is used for covering the first transparent packaging glue and filling the space between the enclosing wall and the first transparent packaging glue, and the refractive index of the second transparent packaging glue is higher than that of the first transparent packaging glue.

3. The light-emitting panel according to claim 2, wherein the first transparent encapsulation adhesive includes a first encapsulation portion and a second encapsulation portion which are sequentially arranged along a light-emitting direction of the light-emitting element, the first encapsulation portion being a column covering the light-emitting element, and a height of the first encapsulation portion being less than 1/2 of a height of the enclosure; the second packaging part is a cambered surface body covering the first packaging part, and the vertex of the cambered surface body is lower than the height of the enclosing wall.

4. The light emitting panel of claim 2, wherein the refractive index of the first transparent encapsulant n1<1.2 and the refractive index of the second transparent encapsulant n2>1.6.

5. The light emitting panel of claim 2, wherein the height of the second transparent encapsulant is level with the height of the perimeter wall.

6. The light-emitting panel according to claim 2, wherein the second transparent encapsulant is filled with a scattering material for scattering light.

7. The light-emitting panel according to claim 1, wherein the light-emitting element is a micro light-emitting diode or a sub-millimeter light-emitting diode.

8. The light-emitting panel according to claim 1, wherein a surface of the driving substrate in a light-emitting direction is coated with a first reflective layer, and an orthographic projection of the first reflective layer on the driving substrate and an orthographic projection of the light-emitting component on the driving substrate do not overlap each other.

9. The light-emitting panel according to claim 2, wherein a surface of the surrounding wall facing the light-emitting element is coated with a second reflective layer.

10. A display device comprising the light-emitting panel according to any one of claims 1 to 9.

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