阅读说明：本技术 发光组件及其制备方法、显示基板、背光模组、显示装置 (Light-emitting assembly, preparation method thereof, display substrate, backlight module and display device ) 是由 狄沐昕 李海旭 梁志伟 刘英伟 王珂 曹占锋 于 2020-03-31 设计创作，主要内容包括：本发明提供了一种发光组件,其中,包括：驱动背板,驱动背板上设置有驱动焊盘；支撑板,支撑板上设置有多个发光二极管,发光二极管包括发光部、第一电极和第二电极,支撑板对应于第一电极的位置和对应于第二电极的位置均设置有通孔,发光部位于支撑板远离驱动背板的一侧,第一电极和第二电极分别位于与其所对应的通孔中；保护层,保护层压覆在发光部上；导电部,导电部填充在通孔中；其中,发光二极管的第一电极和第二电极均通过导电部与驱动焊盘连接。本发明还提供一种发光组件的制备方法、显示基板、背光模组和显示装置。本发明可以使发光二极管保持水平放置,避免了由于发光二极管直接转印至驱动背板上时放置歪斜导致的显示不良。(The present invention provides a light emitting module, comprising: the driving back plate is provided with a driving bonding pad; the LED driving device comprises a supporting plate, a plurality of LEDs and a driving circuit, wherein the supporting plate is provided with a plurality of LEDs, each LED comprises a light emitting part, a first electrode and a second electrode, through holes are formed in the positions, corresponding to the first electrodes, of the supporting plate and the positions, corresponding to the second electrodes, of the supporting plate, the light emitting parts are located on one side, far away from a driving backboard, of the supporting plate, and the first electrodes and the second electrodes are located in the corresponding through holes respectively; a protective layer which is pressed on the light emitting part; a conductive portion filled in the through hole; the first electrode and the second electrode of the light emitting diode are connected with the driving bonding pad through the conductive part. The invention also provides a preparation method of the light-emitting component, a display substrate, a backlight module and a display device. The invention can keep the LED horizontally placed, and avoid bad display caused by the inclined placement of the LED when the LED is directly transferred to the driving backboard.)

1. A light emitting assembly, comprising:

the driving back plate is provided with a driving bonding pad;

the LED driving device comprises a supporting plate, a plurality of LEDs and a driving circuit, wherein the supporting plate is provided with a plurality of LEDs, each LED comprises a light-emitting part, a first electrode and a second electrode, through holes are formed in positions of the supporting plate corresponding to the first electrodes and positions of the supporting plate corresponding to the second electrodes, the light-emitting parts are located on one side, far away from a driving back plate, of the supporting plate, and the first electrodes and the second electrodes are located in the corresponding through holes respectively;

a protective layer that is pressed on the light emitting portion;

a conductive portion filled in the through hole;

and the first electrode and the second electrode of the light-emitting diode are both connected with the driving pad through the conductive part.

2. The light-emitting assembly according to claim 1, wherein a light-shielding wall is disposed between each two adjacent light-emitting portions.

3. The light-emitting assembly according to claim 1, wherein one end of the conductive portion protrudes from a surface of the support plate on a side away from the light-emitting portion, and heights of all the conductive portions protruding from the surface of the support plate are the same.

4. The light emitting assembly of claim 1, wherein the light emitting diode is Micro-L ED or Mini-L ED, and the support plate is a glass substrate.

5. A display substrate comprising the light-emitting device according to any one of claims 1 to 4.

6. A backlight module comprising the light emitting device of any one of claims 1 to 4.

7. A display device, comprising the display substrate of claim 5 or the backlight module of claim 6.

8. A method of making a light emitting assembly, comprising:

forming a plurality of light emitting diodes on a support plate, wherein each light emitting diode comprises a first electrode and a second electrode, through holes are formed in the position, corresponding to the first electrode, of the support plate and through holes are formed in the position, corresponding to the second electrode, of the support plate, and the first electrode and the second electrode are respectively located in the through holes corresponding to the first electrode and the second electrode;

forming a protective layer which is pressed on the light emitting part to fix the light emitting diode;

forming a conductive portion in the through hole;

and a driving back plate is arranged on one side, away from the light emitting part, of the supporting plate, a driving pad is arranged on the driving back plate, and the first electrode and the second electrode of the light emitting diode are connected with the driving pad through the conductive part.

9. The method of manufacturing according to claim 8, wherein the step of forming the plurality of light emitting diodes on the support plate further comprises, before the step of:

a plurality of shading retaining walls are formed on the supporting plate and located between two adjacent light emitting parts.

10. The manufacturing method according to claim 8, wherein the step of forming a conductive portion in the through-hole includes:

forming a conductive structure in the through hole of the support plate by adopting a chemical plating method, wherein one end of the conductive structure protrudes out of the surface of the support plate on the side far away from the light-emitting part;

and polishing one end of the conductive structure protruding out of the surface of the support plate to obtain the conductive part, wherein one end of the conductive part protrudes out of the surface of the support plate far away from the light-emitting part, and the heights of all the conductive parts protruding out of the surface of the support plate are the same.

Technical Field

The invention relates to the technical field of display, in particular to a light-emitting component, a preparation method thereof, a display substrate, a backlight module and a display device.

Background

With the development of chip manufacturing and packaging technologies, Micro light Emitting diodes (Micro L light Emitting diodes, Micro L ED) have become the first choice of research direction for next generation display technologies with their significant advantages of low power consumption, high color gamut, ultra-high resolution, ultra-thin, etc.

In a currently common Micro L ED transfer process, the Micro L ED is usually directly transferred to the driving backplane, and due to the reasons that the contact surface between the driving backplane and the Micro L ED is not flat enough, and the Micro L ED itself has a height difference, etc., the Micro L ED is placed askew when the Micro L ED is directly transferred to the driving backplane, and the severely askew Micro L ED may not be lighted, resulting in a low product yield.

Disclosure of Invention

The invention aims to at least solve one of the technical problems in the prior art, and provides a light-emitting component, a preparation method thereof, a display substrate, a backlight module and a display device.

In order to achieve the above object, the present invention provides a light emitting assembly, wherein the light emitting assembly comprises:

the driving back plate is provided with a driving bonding pad;

the LED driving device comprises a supporting plate, a plurality of LEDs and a driving circuit, wherein the supporting plate is provided with a plurality of LEDs, each LED comprises a light-emitting part, a first electrode and a second electrode, through holes are formed in positions of the supporting plate corresponding to the first electrodes and positions of the supporting plate corresponding to the second electrodes, the light-emitting parts are located on one side, far away from a driving back plate, of the supporting plate, and the first electrodes and the second electrodes are located in the corresponding through holes respectively;

a protective layer that is pressed on the light emitting portion;

a conductive portion filled in the through hole;

and the first electrode and the second electrode of the light-emitting diode are both connected with the driving pad through the conductive part.

Optionally, a light blocking wall is disposed between each two adjacent light emitting portions.

Optionally, one end of the conductive part protrudes from a surface of the support plate on a side away from the light emitting part, and heights of all the conductive parts protruding from the surface of the support plate are the same.

Optionally, the light emitting diode is Micro-L ED or Mini-L ED, and the support plate is a glass substrate.

The invention also provides a display substrate, which comprises the light-emitting component.

The invention also provides a backlight module, which comprises the light-emitting component.

The invention also provides a display device, which comprises the display substrate or the backlight module.

The invention also provides a preparation method of the light-emitting component, which comprises the following steps:

forming a plurality of light emitting diodes on a support plate, wherein each light emitting diode comprises a first electrode and a second electrode, through holes are formed in the position, corresponding to the first electrode, of the support plate and through holes are formed in the position, corresponding to the second electrode, of the support plate, and the first electrode and the second electrode are respectively located in the through holes corresponding to the first electrode and the second electrode;

forming a protective layer which is pressed on the light emitting part to fix the light emitting diode;

forming a conductive portion in the through hole;

and a driving back plate is arranged on one side, away from the light emitting part, of the supporting plate, a driving pad is arranged on the driving back plate, and the first electrode and the second electrode of the light emitting diode are connected with the driving pad through the conductive part.

Optionally, before the step of forming a plurality of light emitting diodes on the support plate, the method further includes:

a plurality of shading retaining walls are formed on the supporting plate and located between two adjacent light emitting parts.

Optionally, the step of forming a conductive portion in the through hole includes:

forming a conductive structure in the through hole of the support plate by adopting a chemical plating method, wherein one end of the conductive structure protrudes out of the surface of the support plate on the side far away from the light-emitting part;

and polishing one end of the conductive structure protruding out of the surface of the support plate to obtain the conductive part, wherein one end of the conductive part protrudes out of the surface of the support plate far away from the light-emitting part, and the heights of all the conductive parts protruding out of the surface of the support plate are the same.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention;

fig. 2 is a second schematic structural diagram of a light emitting device according to an embodiment of the present invention;

FIG. 3 is a flow chart of a method of preparation provided by an embodiment of the present invention;

fig. 4a to 4c are structural change diagrams of a light emitting device according to an embodiment of the invention during a manufacturing process;

fig. 5 is a schematic diagram of an implementation manner of step S3 according to the embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Likewise, the word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Through-hole Glass (TGV) technology is an important technology for realizing narrow-frame display, and is used for connecting electronic components by using laser to open Through holes with widths ranging from tens of um to hundreds of um on Glass with the thickness of hundreds of um and filling metal in the Through holes. The embodiment of the invention is based on the technology that a supporting plate is additionally arranged between the light-emitting diode and the driving back plate, thereby solving the problem that the light-emitting diode is inclined in the transfer process of the light-emitting diode.

Specifically, fig. 1 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention, and as shown in fig. 1, the light emitting device includes: a driving back plate 1, a support plate 2, a protective layer 3 and a conductive part 4. The driving back plate 1 is provided with driving pads 11. The material of the support plate 2 may include glass, a plurality of light emitting diodes 21 are disposed on the support plate 2, and the light emitting diodes 21 include a light emitting portion 21a, a first electrode 21b, and a second electrode 21c, wherein the first electrode 21b of the light emitting diode 21 may be an anode, and the second electrode 21c may be a cathode. The supporting plate 2 is provided with through holes at positions corresponding to the first electrodes 21b and the second electrodes 21c, the light emitting part 21a is located at one side of the supporting plate 2 away from the driving back plate 1, and the first electrodes 21b and the second electrodes 21c are respectively located in the through holes corresponding to the first electrodes 21b and the second electrodes 21 c. The material of the protective layer 3 may include a silicone film, and the protective layer 3 is laminated on the light emitting portion 21 a. The conductive portion 4 is filled in the through hole, and the material thereof includes copper or other material with good conductivity. Wherein, the first electrode 21b and the second electrode 21c of the light emitting diode 21 are connected with the driving pad 11 through the conductive portion 4. The conductive portion 4 may be directly or indirectly connected to the driving pad 11, for example, an anisotropic conductive adhesive may be disposed on the driving pad 11, and the conductive portion 4 is connected to the driving pad 11 through the anisotropic conductive adhesive.

By adopting the light-emitting component of the embodiment of the invention, the light-emitting part 21a is arranged on the support plate 2 with better flatness, and the protective layer 3 is pressed on the light-emitting part 21a, so that the light-emitting diode 21 can be fixed on the surface of the support plate 2, therefore, in the transfer process of the light-emitting diode 21, the light-emitting diode 21 can be kept horizontally placed, the poor display caused by the deflection of the light-emitting diode 21 is avoided, and the product yield is improved.

In the embodiment of the present invention, the driving backplate 1 is used for driving the light emitting diode 21 to emit light under the control of the driving chip IC, and the specific structure of the driving backplate 1 is not limited in the embodiment of the present invention, for example, the driving backplate 1 may be a low Temperature polysilicon (L ow Temperature polysilicon, L TPS) backplate, and specifically, the driving backplate 1 may include a substrate and a TFT array disposed on the substrate, the driving chip IC is bonded on a side of the substrate away from the TFT array, the driving pad 11 is disposed on a side of the TFT array away from the driving chip IC, the driving backplate 1 is disposed on a side of the support plate 2 away from the light emitting part 21a, and a side of the driving backplate 1 where the driving pad 11 is disposed faces the support plate 2, the first electrode 21b and the second electrode 21c of the light emitting diode 21 are both located in the through hole of the support plate 2, and the through hole of the support plate 2 is filled with the conductive part 4, so that the first electrode 21b and the second electrode 21c of the light emitting diode 21 can both be connected with the driving pad 11 through the conductive.

In the embodiment of the present invention, the protective layer 3 is a continuous film layer, and may be laminated on the side of the support plate 2 close to the light emitting portion 21a, in addition to the light emitting portion 21 a. The protective layer 3 can protect the light emitting diode 21 from external factors, in addition to fixing the light emitting part 21a on the surface of the support plate 2, so as to protect the light emitting diode 21 from external factors.

Fig. 2 is a second schematic structural view of a light emitting device according to an embodiment of the present invention, as shown in fig. 2, in some embodiments, the light emitting diode 21 is Micro-L ED or Mini-L ED, the supporting plate is a glass substrate, and a light shielding wall 22 is disposed between each two adjacent light emitting portions 21 a.

In some embodiments, one end of the conductive portion 4 protrudes from the surface of the support plate 2 on the side away from the light emitting portion 21a, and the heights of all the conductive portions 4 protruding from the surface of the support plate 2 are the same. In the embodiment of the present invention, since the conductive portion 4 is filled in the through hole of the supporting board 2 by chemical plating, one end of the conductive portion 4 protrudes out of the surface of the supporting board 2 near the driving back board 1, it can be ensured that each through hole is filled with the conductive portion 4, thereby avoiding the problem that the conductive portion 4 and the driving pad 11 cannot be contacted or the contact area is small due to the fact that the through hole of the supporting board 2 is not filled with the conductive portion 4, and preventing poor contact caused by the problem.

The invention also provides a display substrate, which comprises the light-emitting component. In the embodiment of the present invention, the display substrate may be divided into a plurality of pixel units, each pixel unit includes a plurality of sub-pixels, the plurality of sub-pixels of the same pixel unit are respectively used for displaying a plurality of colors (for example, red, green, and blue) when emitting light, and the plurality of sub-pixels correspond to the plurality of light emitting diodes on the support plate one to one.

The invention also provides a backlight module, which comprises the light-emitting component. Illustratively, the plurality of light emitting diodes are all white light emitting diodes.

The invention also provides a display device, which comprises the display panel or the backlight module.

The display device may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

Fig. 3 is a flowchart of a manufacturing method according to an embodiment of the present invention, and fig. 4a to 4c are structural change diagrams of a light emitting device according to an embodiment of the present invention in a manufacturing process, which are shown in fig. 3 to 4c, and the manufacturing method includes:

s1, forming a plurality of light emitting diodes 21 on the support plate 2, wherein each light emitting diode 21 comprises a light emitting portion 21a, a first electrode 21b and a second electrode 21c, the support plate 2 is provided with through holes at positions corresponding to the first electrodes 21b and the second electrodes 21c, and the first electrodes 21b and the second electrodes 21c are respectively located in the through holes corresponding to the first electrodes 21b and the second electrodes 21 c.

In step S1, as shown in fig. 4a, the support plate 2 provided with a plurality of through holes in advance may be used, and thus, the first electrode 21b and the second electrode 21c of the light emitting diode 21 may be directly inserted into the corresponding through holes, respectively, to thereby obtain the support plate 2 formed with a plurality of light emitting diodes 21. The first electrode 21b may be an anode, and the second electrode 21c may be a cathode.

S2, forming the protective layer 3, and fixing the light emitting diode 21 by pressing the protective layer 3 on the light emitting part 21 a.

In step S2, as shown in fig. 4b, the material of the protection layer 3 may include a silicone, and the protection layer 3 may contact the supporting board 2 in addition to pressing on the side of the light emitting portion 21a away from the supporting board 2, so as to isolate the light emitting diode 21 from the outside, so as to protect the light emitting diode 21 from being damaged by external factors.

S3, forming the conductive part 4 in the through hole.

In step S3, as shown in fig. 4c, the material of the conductive part 4 may include copper, and the conductive part 4 may fill the entire via hole.

S4, the driving backplate 1 is disposed on the side of the supporting plate 2 away from the light emitting portion 21a, the driving pad 11 is disposed on the driving backplate 1, and the first electrode 21b and the second electrode 21c of the light emitting diode 21 are connected to the driving pad 11 through the conductive portion 4.

In the embodiment of the present invention, the driving backplane 1 may include a substrate and a thin film transistor TFT array disposed on the substrate, and in step S4, the thin film transistor TFT array and the driving pad may be fabricated on the substrate in advance, and then the substrate disposed with the thin film transistor TFT array and the supporting plate 2 disposed with the light emitting diode 21 are boxed; the TFT array and the driver pad may be formed directly on the surface of the support plate 2 away from the light-emitting portion 21a, and then the substrate may be formed on the side of the TFT array away from the support plate 2, or another structure may be provided on the side of the substrate away from the support plate 2. Among them, the driving pad 11 may be formed on a side of the thin film transistor TFT array close to the support plate 2, thereby facilitating the conductive portion 4 to be connected with the driving pad 11.

By adopting the preparation method of the embodiment of the invention, the protective layer 3 is pressed on one side of the light-emitting part 21a far away from the support plate 2, so that the light-emitting diode 21 can be fixed on the surface of the support plate 2, therefore, in the transfer process of the light-emitting diode 21, the light-emitting diode 21 can be kept horizontally placed, the poor display caused by the deflection of the light-emitting diode 21 is avoided, and the product yield is improved.

In some embodiments, before step S2, the method further includes:

a plurality of light-shielding walls 22 are formed on the support plate 2, and the light-shielding walls 22 are located between the adjacent two light-emitting portions 21 a. By providing the light-shielding walls 22 between every adjacent two of the light-emitting parts 21a, crosstalk of light between the plurality of light-emitting parts 21a can be prevented.

Fig. 5 is a schematic diagram illustrating an implementation manner of step S3 according to an embodiment of the present invention, and as shown in fig. 5, in some specific embodiments, step S3 includes:

s31, forming a conductive structure in the through hole of the support plate 2 by electroless plating, wherein one end of the conductive structure protrudes from the surface of the support plate 22 on the side far away from the light-emitting part 21 a.

In step S31, the support board 2 to be formed with the conductive structures is placed in an electroless plating solution for electroless plating (e.g., copper plating), and then the support board 2 plated with the conductive structures is taken out, and the electroless plating time is controlled to make one end of each conductive structure protrude from the surface of the support board 22 on the side away from the light-emitting portion 21a, so as to ensure that all the conductive structures can fill the entire through hole.

S32, polishing the end of the conductive structure protruding from the surface of the supporting board 2 to obtain the conductive parts 4, wherein the end of the conductive part 4 protrudes from the surface of the supporting board 2 away from the light-emitting part 21a, and the heights of all the conductive parts 4 protruding from the surface of the supporting board 2 are the same.

Since the conductive structure is formed by chemical plating in step S31, some conductive structures are plated around the through hole of the support plate 2, i.e. on the surface of the support plate 2, in step S32, the end of the conductive structure protruding from the surface of the support plate 2 is polished by chemical mechanical polishing to remove the conductive structure plated on the surface of the support plate 2, so as to obtain the conductive part 4, and the end of the conductive part 4 protrudes from the surface of the support plate 2 away from the light emitting part 21a, and the heights of all the conductive parts 4 protruding from the surface of the support plate 2 are the same, which is favorable for connecting the conductive part 4 and the driving pad 11.

It should be noted that, in some embodiments, only the conductive structure located in the through hole of the support plate 2 may be left by polishing treatment, so as to obtain the conductive portion 4, and in this case, the surface of the portion of the conductive portion 4 for connecting with the driving pad 11 is flush with the surface of the support plate 2 on the side away from the light emitting portion 21a, so that the flatness of the contact surface between the support plate 2 and the driving back plate 1 may be improved.

It should be noted that, in some embodiments, a conductive structure layer may be formed in the through hole of the support plate 2 and on the side of the support plate 2 away from the light emitting portion 21a, and then the conductive structure layer is patterned, so as to obtain the conductive portion 4.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.