WO2024040843A1

WO2024040843A1 - Display panel and drive substrate thereof

Info

Publication number: WO2024040843A1
Application number: PCT/CN2022/143542
Authority: WO
Inventors: 李泽尧; 李荣荣
Original assignee: 惠科股份有限公司
Priority date: 2022-08-23
Filing date: 2022-12-29
Publication date: 2024-02-29
Also published as: CN115101545A; CN115101545B

Abstract

The present application provides a display panel (100) and a drivr substrate (1) thereof. The drive substrate (1) is used for driving an inorganic light-emitting diode to emit light. The drive substrate (1) comprises a substrate (11) as well as a first insulating layer (122), an active layer (123), and an electrode layer (125) which are sequentially arranged on the substrate (11). The electrode layer (125) comprises a source electrode (1251) and a drain electrode (1252) which are arranged in the same layer. A light shielding portion is further comprised. The light shielding portion (13) is located between the electrode layer (125) and the substrate (11) and at least partially overlaps with the electrode layer (125). The light shielding portion (13) is spaced apart from the active layer (123) and penetrates the first insulating layer (122); and/or the light shielding portion (13) is at least partially located on the side of the electrode layer (125) away from the substrate (11) and covers the active layer (123). By means of arranging the light shielding portion (13) around the active layer (123) to shield from light emitted towards the active layer (123), the active layer (123) in the drive substrate (1) is prevented from being illuminated and thus causing changes in the characteristics of a thin film transistor (12).

Description

Display panel and its driving substrate

Cross-references to related applications

This application claims priority from Chinese patent application 202211014947.9 submitted on August 23, 2022, the entire content of which is incorporated herein by reference.

Technical field

The present application relates to the field of display technology, and in particular to a display panel and its driving substrate.

Background technique

Inorganic Micro Light Emitting Diode (Micro LED) displays are one of the hot spots in the field of display research today. Compared with OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) displays, Micro LEDs have high reliability and low power consumption. , high brightness and fast response speed. Among them, the design of the drive substrate used to control LED light emission is the core technical content of Micro LED displays and has important research significance. However, since the light-emitting direction of the LED is uncontrolled, there will be lateral light emitted in the direction of the driving substrate. This light will cause temporary or permanent changes in the characteristics of the TFT (Thin Film Transistor) device in the driving substrate. changes, thereby affecting display quality. The usual approach is to add a layer of encapsulated black glue after the LED transfer process to solve the above problems. However, the black glue causes a huge attenuation of the brightness of the LED. When it is necessary to reduce this attenuation, the process that needs to be adopted is cumbersome. , and will cause damage to the LED and affect the transfer yield. Therefore, another more convenient method is urgently needed to solve this problem.

Contents of the invention

The main technical problem to be solved by this application is to provide a display panel and its driving substrate to solve the problem in the prior art that the lateral light emitted by the LED towards the driving substrate causes temporary or permanent changes in the characteristics of the thin film transistor device in the driving substrate. .

In order to solve the above technical problems, the first technical solution provided by this application is to provide a driving substrate for driving inorganic light-emitting diodes to emit light. The driving substrate includes:

substrate;

The gate electrode, the first insulating layer, the active layer and the electrode layer are arranged on the substrate in sequence; the electrode layer includes a source electrode and a drain electrode arranged on the same layer;

The method also includes a light-shielding portion, which is located between the electrode layer and the substrate, at least partially overlaps with the electrode layer, is spaced apart from the active layer, and passes through the first insulating layer; and/or the light-shielding portion is at least partially overlapped with the electrode layer. It is located on the side of the electrode layer away from the substrate and covers the active layer.

Wherein, the light-shielding part includes a first light-shielding part, which is at least partially located on a side of the electrode layer away from the substrate and covers the active layer.

Wherein, the light shielding part further includes a second light shielding part, the second light shielding part is located between the substrate and the electrode layer and passes through the first insulating layer.

Wherein, the first light-shielding part and the second light-shielding part are provided independently of each other; the second light-shielding part and the electrode layer are made of the same material and are connected to each other.

Wherein, the number of the second light-shielding parts is two, and the two second light-shielding parts are respectively arranged on opposite sides of the active layer along the direction from the source electrode to the drain electrode; the two second light-shielding parts are located on the first insulation The orthographic projection on the layer matches the orthographic projection of the surrounding active layer on the first insulating layer.

It also includes a second insulating layer, the second insulating layer is disposed on the side of the electrode layer away from the substrate; the first light-shielding part includes a first light-shielding top, and the first light-shielding top is disposed on the side of the second insulating layer away from the substrate. , and only corresponds to the active layer setting and covers the active layer.

Wherein, the first light-shielding part further includes a first light-shielding side part, the first light-shielding side part is located between the first light-shielding top and the electrode layer, and passes through the second insulating layer and extends to the surface of the electrode layer.

Wherein, the first light-shielding side part is a ring-shaped structure, and the projection of the active layer on the second insulation layer is located within the ring-shaped structure.

Among them, the first light-shielding top part and the first light-shielding side part have an integrally formed structure and are made of black insulating material.

In order to solve the above technical problems, the second technical solution provided by this application is to provide a display panel. The display surface includes a driving substrate and a plurality of inorganic light-emitting diodes. The driving substrate is the above-mentioned driving substrate.

Beneficial effects of the present application: Different from the existing technology, this application provides a display panel and a driving substrate thereof. The driving substrate is used to drive an inorganic light-emitting diode to emit light. The driving substrate includes a substrate and a first first electrode arranged sequentially on the substrate. Insulating layer, active layer and electrode layer; the electrode layer includes a source electrode and a drain electrode arranged in the same layer; it also includes a light-shielding portion, the light-shielding portion is located between the electrode layer and the substrate, and at least partially overlaps with the electrode layer , and is spaced apart from the active layer and passes through the first insulating layer; and/or the light-shielding portion is at least partially located on a side of the electrode layer away from the substrate and covers the active layer. By providing a light-shielding portion around the active layer, the light directed to the active layer is blocked, thereby preventing the active layer in the driving substrate from being exposed to light and causing changes in the characteristics of the thin film transistor.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without making any creative efforts.

Figure 1 is a schematic structural diagram of an embodiment of a display panel provided by this application;

Figure 2 is a simple structural schematic diagram of the first embodiment of the driving substrate and light-emitting unit provided by this application;

Figure 3 is a simple structural schematic diagram of a second embodiment of a driving substrate and a light-emitting unit provided by this application;

Figure 4 is a simple structural schematic diagram of a third embodiment of a driving substrate and a light-emitting unit provided by this application;

Figure 5 is a schematic cross-sectional structural diagram of an embodiment of the first light-shielding side part and the active layer at A-A in Figure 4;

Figure 6 is a simple structural schematic diagram of a fourth embodiment of a driving substrate and a light-emitting unit provided by this application;

Figure 7 is a schematic cross-sectional structural diagram of an embodiment of the second light shielding portion and the active layer at B-B in Figure 6;

Figure 8 is a simple structural schematic diagram of the fifth embodiment of the driving substrate and light-emitting unit provided by the present application;

Figure 9 is a simple structural schematic diagram of the sixth embodiment of the driving substrate and light-emitting unit provided by this application;

Figure 10 is a schematic cross-sectional structural diagram of an embodiment of the second light shielding portion and the active layer at C-C in Figure 9;

Figure 11 is a simple structural schematic diagram of the seventh embodiment of the driving substrate and light-emitting unit provided by the present application;

FIG. 12 is a schematic cross-sectional structural diagram of an embodiment of the second light shielding portion and the active layer at D-D in FIG. 11 .

Explanation of reference numbers:

Driving substrate-1, substrate-11, thin film transistor-12, gate electrode-121, first insulating layer-122, active layer-123, ohmic contact layer-124, electrode layer-125, source electrode-1251 , drain electrode-1252, light-shielding part-13, first light-shielding part-131, first light-shielding top part-1311, first light-shielding side part-1312, second light-shielding part-132, first sub-light-shielding part-1321, Second sub-light shielding part-1322, third sub-light shielding part-1323, fourth sub-light shielding part-1324, incident point-a, wall thickness-d, common electrode-14, first electrode-15, second electrode-16, Flat layer-17, opening structure-171, second insulating layer-18, light-emitting unit-2, anode-21, cathode-22, packaging layer-3, cover plate-4, display panel-100.

Detailed ways

The solutions of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

In the following description, specific details such as specific system structures, interfaces, technologies, etc. are provided for the purpose of explanation and not limitation, so as to provide a thorough understanding of the present application.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include at least one of these features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited. All directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative positional relationship between components in a specific posture (as shown in the drawings). , sports conditions, etc., if the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but also includes unlisted steps or units, or alternatively includes steps or units for these processes. , other steps or units inherent to a method, product or device.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

Please refer to FIG. 1 , which is a schematic structural diagram of an embodiment of a display panel provided by the present application.

This application provides a display panel 100 . The display panel 100 includes a driving substrate 1 , a plurality of light-emitting units 2 , an encapsulation layer 3 and a cover plate 4 . The driving substrate 1 is used to drive the light emitting unit 2 to emit light. A plurality of light-emitting units 2 are arranged at intervals on one side of the driving substrate 1 . The encapsulating layer 3 is arranged on one side of the driving substrate 1 . The encapsulating layer 3 surrounds the light-emitting units 2 and fills the gaps between the light-emitting units 2 while covering the light-emitting units 2 . the side away from the substrate 11 . The cover 4 is disposed on the side of the packaging layer 3 away from the driving substrate 1 . In other embodiments, the display panel 100 may not include the cover 4 .

The encapsulation layer 3 may be a multi-layer structure or a single-layer structure. When the encapsulation layer 3 has a multi-layer structure, the materials of each layer structure may be the same or different. The encapsulation layer 3 may be resin or other organic materials. By encapsulating the light-emitting unit 2, the side of the light-emitting unit 2 away from the substrate 11 can be flattened, and at the same time, light interference between multiple light-emitting units 2 can be prevented. In this embodiment, the encapsulation layer includes a bonding layer (not shown) and a protective layer (not shown) covering the bonding layer.

The light-emitting unit 2 is an inorganic light-emitting diode, and the size of the inorganic light-emitting diode is less than or equal to 200 μm. Inorganic light-emitting diodes can be micron light-emitting diodes (Micro-LED) or small light-emitting diodes (Mini-LED). The size of Mini-LED is 50 μm ~ 200 μm, and the size of Micro-LED is less than 50 μm.

The driving substrate 1 can be a hard substrate or a flexible substrate. There are no excessive restrictions here and the design can be carried out according to actual needs.

Please refer to FIG. 2 , which is a simplified structural diagram of a first embodiment of a driving substrate and a light-emitting unit provided by the present application.

This application provides a driving substrate 1. The driving substrate 1 includes a substrate 11, a thin film transistor 12, a light shielding part 13, a common electrode 14, a first electrode 15, a second electrode 16 and a flat layer 17. The thin film transistor 12 is disposed on the substrate 11 and is electrically connected to the light emitting unit 2 through the first electrode 15 . The first electrode 15 is correspondingly connected to the anode 21 of the light-emitting unit 2 , and the second electrode 16 is correspondingly connected to the cathode 22 of the light-emitting unit 2 . The light shielding portion 13 is provided outside and/or inside the thin film transistor 12 to block the lateral light emitted by the light emitting unit 2 toward the thin film transistor 12 and protect the thin film transistor 12 from being affected by light. The flat layer 17 is provided on the side of the thin film transistor 12 and the light-shielding portion 13 away from the substrate 11 to facilitate the subsequent bonding of the light-emitting unit 2 and the driving substrate 1 . The driving substrate 1 also includes a plurality of scanning lines (not shown), a plurality of data lines (not shown), a VDD signal line (not shown), and a VSS signal line (not shown).

The substrate 11 may be one or more of sapphire, quartz, silicon and silicon carbide, without excessive limitations here. The substrate 11 may be a flexible film material or a rigid film material. In this embodiment, the substrate 11 is a rigid film material, specifically, the substrate 11 is transparent glass.

The thin film transistor 12 includes a gate electrode 121, a first insulating layer 122, an active layer 123, an ohmic contact layer 124 and an electrode layer 125 which are sequentially arranged on the substrate 11. The electrode layer 125 includes a source electrode 1251 and a drain electrode 1252 arranged in the same layer. The first insulating layer 122 is disposed on the side of the gate electrode 121 away from the substrate 11 and covers the entire substrate 11 . The active layer 123 is disposed on a side of the first insulating layer 122 away from the substrate 11 and is disposed corresponding to the gate electrode 121 . The electrode layer 125 is disposed on a side of the active layer 123 away from the substrate 11 . The source electrode 1251 and the drain electrode 1252 in the electrode layer 125 are symmetrically disposed on opposite sides of the active layer 123 . One end of the VDD signal line is connected to the driving circuit, the other end is connected to the source electrode 1251 , the drain electrode 1252 is connected to the first electrode 15 , and is electrically connected to the anode 21 of the light-emitting unit 2 through the first electrode 15 . The light-emitting unit 2 is connected to the second electrode 16 and is electrically connected to the common electrode 14 through the second electrode 16 . Two spaced and insulated ohmic contact layers 124 are provided between the electrode layer 125 and the active layer 123 . One ohmic contact layer 124 is disposed between the source electrode 1251 and the active layer 123 , and the other ohmic contact layer 124 is disposed between the drain electrode 1252 layer 125 and the active layer 123 . The thin film transistor 12 may be a hydrogenated amorphous silicon (a-Si:H) TFT, a low-temperature polysilicon (low-temperature poly-Si, LTPS) TFT or an amorphous oxide (AOS) TFT. In this embodiment, the thin film transistor 12 is a hydrogenated amorphous silicon TFT.

The projection of the flat layer 17 on the substrate 11 covers the entire substrate 11 . The side of the planarization layer 17 away from the substrate 11 is planarized. A plurality of opening structures 171 are provided at intervals on the side of the flat layer 17 away from the substrate 11 . The opening structures 171 penetrate the flat layer 17 , and the first electrode 15 and the second electrode 16 are respectively arranged in the opening structures 171 . An opening structure 171 is provided with a first electrode 15 or a second electrode 16 correspondingly. The flat layer 17 may be an anisotropic conductive adhesive film or other materials.

The light shielding part 13 includes a first light shielding part 131 , and the first light shielding part 131 includes a first light shielding top part 1311 . The first light-shielding top 1311 is made of black insulating material. The black insulating material can be one or more of Cr, CrOx and black resin, or other insulating materials with light-shielding effect. The first light-shielding top 1311 is disposed on the side of the electrode layer 125 away from the substrate 11 , and the projection of the first light-shielding top 1311 on the substrate 11 covers the entire substrate 11 . The flat layer 17 is disposed on the side of the first light-shielding top 1311 away from the substrate 11 , and the opening structure 171 penetrates the flat layer 17 and the first light-shielding top 1311 . Since the light-emitting direction of the light-emitting unit 2 is uncontrolled, there will be lateral light emitted in the direction of the driving substrate 1. After the lateral light irradiates the active layer 123 in the thin film transistor 12, the device of the thin film transistor 12 will be damaged. The characteristics change temporarily or permanently, thereby affecting the display quality of the display panel 100 . By providing the light shielding portion 13, the light directed to the active layer 123 can be blocked, thereby protecting the characteristics of the thin film transistor 12 from changing. This embodiment blocks all the light emitted from the light-emitting unit 2 to the driving substrate 1, thereby protecting the thin film transistor 12 from light.

Please refer to Figure 3. Figure 3 is a simple structural schematic diagram of a second embodiment of a driving substrate and a light-emitting unit provided by the present application.

The structure of the second embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application is basically the same as that of the first embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application. The difference is that the driving substrate 1 also includes a second insulating layer. 18. The first light-shielding top 1311 is disposed on the side of the second insulating layer 18 away from the substrate 11, and is disposed only corresponding to and covering the active layer 123.

In this embodiment, the driving substrate 1 further includes a second insulating layer 18 , and the second insulating layer 18 is disposed on the side of the electrode layer 125 away from the substrate 11 . The material of the second insulating layer 18 and the first insulating layer 122 may be the same or different, and are not limited here. The opening structure 171 penetrates the flat layer 17 and the second insulating layer 18 . The first light-shielding top 1311 is disposed on a side of the second insulating layer 18 away from the substrate 11 , and is disposed only corresponding to and covering the active layer 123 . That is, the orthographic projection of the first light-shielding top 1311 on the substrate 11 completely covers the orthographic projection of the active layer 123 on the substrate 11 to block the side light emitted from the light-emitting unit 2 that is directed toward the side of the active layer 123 away from the substrate 11 . To light.

Please refer to Figures 4 and 5. Figure 4 is a simple structural schematic diagram of a third embodiment of a driving substrate and a light-emitting unit provided by this application. Figure 5 is an embodiment of the first light-shielding side part and the active layer at A-A in Figure 4. Schematic diagram of cross-sectional structure.

The structure of the third embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application is basically the same as that of the second embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application. The difference is that the first light shielding part 131 also includes a first Light shielding sides 1312.

The first light-shielding side portion 1312 is located between the first light-shielding top portion 1311 and the electrode layer 125 , passes through the second insulating layer 18 and extends to the surface of the electrode layer 125 . The first light-shielding side portion 1312 is a ring-shaped structure, and the projection of the active layer 123 on the second insulating layer 18 is located in the ring-shaped structure to block the lateral light emitted by the light-emitting unit 2 from passing through the electrode layer 125 or other components inside the driving substrate 1 The light reflected by the layer is directed toward the side of the active layer 123 away from the substrate 11 . In this embodiment, the first light-shielding top portion 1311 and the first light-shielding side portion 1312 are integrally formed structures, and both are made of black insulating material. The first light-shielding part 131 can be made by a yellow light process after the thin film transistor 12 is produced, or can be made by other methods. There is no limitation here, and the design can be made according to actual needs. The projection of the first light-shielding top portion 1311 on the second insulation layer 18 covers the first light-shielding side portion 1312 to better prepare the first light-shielding portion 131 . In other embodiments, the first light-shielding top portion 1311 and the first light-shielding side portion 1312 may not be an integrally formed structure. For example, the first light-shielding top part 1311 is made of black insulating material, and the first light-shielding side part 1312 is made of metal. The metal can reflect the light directed to the first light-shielding side part 1312 , thereby blocking the lateral light emitted by the light-emitting unit 2 through the electrode layer 125 Or for the purpose of driving the light reflected by other layers inside the substrate 1 and emitted to the side of the active layer 123 away from the substrate 11 , the projection of the first light-shielding top 1311 on the second insulating layer 18 covers the first light-shielding side 1312 to prevent The first light-shielding side portion 1312 is short-circuited with the first electrode 15 , which affects the good electrical connection between the light-emitting unit 2 and the driving substrate 1 .

Please refer to Figures 6 and 7. Figure 6 is a simple structural schematic diagram of a fourth embodiment of a driving substrate and a light-emitting unit provided by this application. Figure 7 is a cross-section of an embodiment of the second light shielding portion and the active layer at B-B in Figure 6. Schematic.

The structure of the fourth embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application is basically the same as that of the third embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application. The difference is that the light-shielding part 13 also includes a second light-shielding part. 132.

In this embodiment, the light shielding part 13 includes a first light shielding part 131 and a second light shielding part 132. The first light shielding part 131 and the second light shielding part 132 are provided independently of each other. The first light shielding part 131 includes a first light shielding top part 1311 and a first light shielding side part 1312. The projection of the first light-shielding portion 131 on the substrate 11 only covers the active layer 123 to block the lateral light emitted by the light-emitting unit 2 toward the side of the active layer 123 away from the substrate 11 . The second light-shielding portion 132 is located between the substrate 11 and the electrode layer 125 , at least partially overlaps the electrode layer 125 , is spaced apart from the active layer 123 , and passes through the first insulating layer 122 . The number of the second light shielding portions 132 is two, and the two second light shielding portions 132 are respectively disposed on opposite sides of the active layer 123 along the direction from the source electrode 1251 to the drain electrode 1252; the two second light shielding portions 132 The orthographic projection on the first insulating layer 122 cooperates with the orthographic projection of the surrounding active layer 123 on the first insulating layer 122 to block the lateral light emitted by the light-emitting unit 2 from being reflected by the electrode layer 125 or other layers inside the driving substrate 1 The light is then emitted toward the side of the active layer 123 close to the substrate 11 .

One of the two second light-shielding portions 132 is disposed between the source electrode 1251 and the substrate 11 , passes through the first insulating layer 122 and extends to the substrate 11 , and the other is disposed correspondingly between the drain electrode 1252 and the substrate. 11 , passes through the first insulating layer 122 and extends to the substrate 11 . The two second light shielding parts 132 are spaced apart and insulated. The orthographic projection of the two second light-shielding portions 132 on the first insulating layer 122 matches the orthographic projection of the surrounding gate electrode 121 on the first insulating layer 122 , and the space between the second light-shielding portion 132 and the gate electrode 121 is filled with The first insulating layer 122 prevents the second light shielding portion 132 from short-circuiting the electrode layer 125 and the gate electrode 121 . The shape and/or size of the two second light shielding parts 132 may be the same, or may be different in shape and size, as long as it is ensured that lateral light cannot pass between the two second light shielding parts 132 in a direction parallel to the substrate 11 It suffices to illuminate the active layer 123 through the gap between them. In this embodiment, the cross-sections of the two second light shielding portions 132 in the direction parallel to the substrate 11 are both U-shaped, but have different sizes. The second light shielding part 132 and the electrode layer 125 are made of the same material and are connected to each other. That is to say, the second light shielding part 132 can be prepared together with the electrode layer 125, which can simplify the preparation process. It can be understood that the material of the second light shielding part 132 may also be different from the material of the electrode layer 125. For example, the second light shielding part 132 may be made of black insulating material. The materials of the two light-shielding parts 13 may be the same or different, and they may be designed according to actual requirements.

In other embodiments, in a direction parallel to the substrate 11 , the cross section of the second light shielding portion 132 may be an arc, an unclosed polygon, or other irregular shapes. The embodiments of the present application only show some examples, which does not mean that the structures thereof are limited to this. The wall thickness d of the second light shielding part 132 in the direction parallel to the substrate 11 is as large as possible, so that the gap between the second light shielding part 132 and the gate electrode 121 is as small as possible, thereby making the light emitting unit 2 emit light After being reflected by the substrate 11 and passing through the gap between the second light shielding part 132 and the gate electrode 121, the lateral light cannot be emitted to the side of the active layer 123 close to the substrate 11; and/or the second light shielding part 132 is parallel to The wall thickness d in the direction of the substrate 11 is as large as possible, so that the gap between the second light shielding part 132 and the common electrode 14 is as small as possible, so that the lateral light emitted by the light-emitting unit 2 is reflected by the substrate 11 The reflected light cannot pass through the gap between the second light shielding part 132 and the gate electrode 121 , that is, the reflected light cannot irradiate the side of the active layer 123 close to the substrate 11 . When the second light shielding part 132 is made of black insulating material, the second light shielding part 132 may be in contact with the gate electrode 121 and the common electrode 14 so that the wall thickness d of the second light shielding part 132 in the direction parallel to the substrate 11 is maximum. When the second light shielding part 132 is made of metal, due to process limitations and to prevent short circuits, the width of the gap between the second light shielding part 132 and the gate electrode 121 is not less than 1.5 μm, and the gap between the second light shielding part 132 and the common electrode 14 is not less than 1.5 μm. The gap width between them is not less than 1.5μm. In specific embodiments, the specific shape, size and material of the second light-shielding portion 132 can be set according to actual needs, and there is no specific limitation on this.

Please refer to FIG. 8 , which is a simplified structural diagram of a fifth embodiment of a driving substrate and a light-emitting unit provided by the present application.

The structure of the fifth embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application is basically the same as that of the fourth embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application. The difference is that the light-shielding part 13 only includes a second light-shielding part. 132.

In this embodiment, the light shielding part 13 only includes the second light shielding part 132 . The drive substrate 1 does not include the second insulating layer 18 and the first light shielding portion 131 . The light-shielding portion 13 of this embodiment can block the lateral light emitted by the light-emitting unit 2 and then reflected toward the side of the active layer 123 close to the substrate 11 .

Please refer to Figures 8 to 10. Figure 9 is a simple structural schematic diagram of a sixth embodiment of a driving substrate and a light-emitting unit provided by the present application. Figure 10 is a cross-section of an embodiment of the second light shielding portion and the active layer at C-C in Figure 9. Schematic.

The sixth embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application has basically the same structure as the fifth embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application. The difference is that the light-shielding part 13 only includes a second light-shielding part. 132, and there are four second light shielding parts 132.

In this embodiment, the number of the second light shielding parts 132 is four, and the four second light shielding parts 132 are insulated from each other and arranged at intervals. The four second light-shielding parts 132 are respectively named first sub-light-shielding part 1321, second sub-light-shielding part 1322, third sub-light-shielding part 1323 and fourth sub-light-shielding part 1324. The first sub-light shielding portion 1321 and the second sub-light shielding portion 1322 are respectively disposed between the source electrode 1251 and the substrate 11 , passing through the first insulating layer 122 and extending to the substrate 11 . The third sub-light shielding portion 1323 and the fourth sub-light shielding portion 1324 are respectively disposed between the drain electrode 1252 and the substrate 11 , passing through the first insulating layer 122 and extending to the substrate 11 . Among the four second light-shielding portions 132 Two of them form a group, and the orthographic projection of the second light-shielding portion 132 on the first insulating layer 122 of each group matches the orthographic projection of the surrounding gate electrode 121 on the first insulating layer 122 , and the second light-shielding portion 132 and the gate The first insulating layer 122 is filled between the electrodes 121 . That is to say, the first sub-light shielding part 1321 and one of the third sub-light shielding part 1323 and the fourth sub-light shielding part 1324 form one group, and the other two second light-shielding parts 132 form another group. The second sub-light shielding part 1322 and the third sub-light shielding part 1323 are arranged as close to the gate electrode 121 as possible. The first sub-light shielding part 1321 and the fourth sub-light shielding part 1324 are arranged as far away from the gate electrode 121 as possible and as close as possible. The common electrode 14 is provided, and the first sub-light-shielding portion 1321 and the fourth sub-light-shielding portion 1324 must overlap or be arranged tangentially to the electrode layer 125 so that the lateral light emitted by the light-emitting unit 2 cannot pass through the first sub-light-shielding portion 1321 and the electrode layer. The gap between 125 and the gap between the fourth sub-light shielding part 1324 and the electrode layer 125 is illuminated to the substrate 11 . Furthermore, since the first sub-light shielding part 1321 and the fourth sub-light shielding part 1324 are arranged away from the gate electrode 121 , the lateral light emitted by the light-emitting unit 2 can illuminate the substrate 11 at an angle different from the angle between the substrate 11 and the substrate 11 . Compared with the fifth embodiment of the driving substrate 1 and the light-emitting unit 2 provided in this application, the angle between the light that the lateral light energy irradiates onto the substrate 11 and the substrate 11 is larger, so that in this embodiment, the lateral light energy irradiates the substrate 11. The incident point a of the light on the side surface of the substrate 11 away from the second light shielding part 132 is further away from the gate electrode 121 , so that the lateral light emitted by the light emitting unit 2 and reflected by the substrate 11 cannot pass through the second sub-light shielding part. The gap between the portion 1322 and the gate electrode 121 and the gap between the third sub-light shielding portion 1323 and the gate electrode 121 , that is, the reflected light cannot irradiate the side of the active layer 123 close to the substrate 11 .

The second light shielding part 132 and the electrode layer 125 are made of the same material and are connected to each other, which can simplify the production process. In other embodiments, at least part of the second light-shielding portion 132 and the electrode layer 125 may be made of different materials. For example, the first sub-light-shielding portion 1321 and the fourth sub-light-shielding portion 1324 are made of black insulating material, and the second sub-light-shielding portion 1322 and the fourth sub-light-shielding portion 1324 are made of black insulating material. The third sub-light shielding portion 1323 is made of the same material as the electrode layer 125 .

It should be understood that the design method of the second light-shielding portion 132 in this embodiment is also applicable to other embodiments of the driving substrate 1 and the light-emitting unit 2 provided by the present application, and will not be described again here. Please refer to this embodiment. Example design.

Please refer to Figures 8, 11 and 12. Figure 11 is a simplified structural diagram of the seventh embodiment of the driving substrate and light-emitting unit provided by the present application. Figure 12 is an implementation of the second light shielding portion and the active layer at D-D in Figure 11. Schematic diagram of the cross-sectional structure of the example.

The seventh embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application has basically the same structure as the fifth embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application. The difference is that the second light-shielding part 132 is made of black insulating material. , and in contact with the common electrode 14 and the gate electrode 121 .

In this embodiment, the second light shielding part 132 is made of black insulating material and is in contact with the common electrode 14 and the gate electrode 121 . The light-shielding principle of the second light-shielding portion 132 of this embodiment is the same as the light-shielding principle of the second light-shielding portion 132 of the sixth embodiment of the driving substrate 1 and the light-emitting unit 2 provided by this application, and will not be described again here. Since the second light shielding portion 132 is made of black insulating material, the two second light shielding portions 132 can both be in contact with the common electrode 14 and the gate electrode 121 . Furthermore, the two light shielding portions 132 can be arranged as shown in FIG. 7 . The two light shielding parts 132 may also form a closed figure, and the two second light shielding parts 132 may also be an integrally formed structure. In this embodiment, the two second light-shielding portions 132 are respectively provided corresponding to the electrode layers and contact each other to form an integral annular structure, so that the lateral light emitted by the light-emitting unit 2 and reflected by the substrate 11 cannot After passing through the gap between the second light shielding portion 132 and the gate electrode 121 , that is, the reflected light cannot irradiate the side of the active layer 123 close to the substrate 11 . In other embodiments, the second light shielding part 132 may have an irregular pattern, which is not limited here.

This application provides a driving substrate 1. The driving substrate 1 is used to drive an inorganic light-emitting diode to emit light. The driving substrate 1 includes a substrate 11 and a first insulating layer 122, an active layer 123 and an electrode layer sequentially arranged on the substrate 11. 125; The electrode layer 125 includes a source electrode 1251 and a drain electrode 1252 arranged in the same layer; it also includes a light shielding portion 13, the light shielding portion 13 is located between the electrode layer 125 and the substrate 11, and at least partially overlaps the electrode layer 125 , and is spaced apart from the active layer 123 and passes through the first insulating layer 122; and/or the light shielding portion 13 is at least partially located on the side of the electrode layer 125 away from the substrate 11 and covers the active layer 123. By providing the light-shielding portion 13 around the active layer 123, the light directed toward the active layer 123 is blocked, thereby preventing the thin film transistor 12 in the driving substrate 1 from being exposed to light and causing changes in characteristics.

The above are only embodiments of the present application, and do not limit the scope of patent protection of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of the present application may be directly or indirectly used in other related technical fields. , are all equally included in the patent protection scope of this application.

Claims

A driving substrate used to drive inorganic light-emitting diodes to emit light, including:

substrate;

A gate electrode, a first insulating layer, an active layer and an electrode layer are arranged on the substrate in sequence; the electrode layer includes a source electrode and a drain electrode arranged on the same layer;

Wherein, a light shielding portion is further included, the light shielding portion is located between the electrode layer and the substrate, at least partially overlaps with the electrode layer, is spaced apart from the active layer, and passes through the third an insulating layer; and/or, the light-shielding portion is at least partially located on a side of the electrode layer away from the substrate and covers the active layer.
The driving substrate according to claim 1, wherein the light shielding portion includes a first light shielding portion, the first light shielding portion is at least partially located on a side of the electrode layer away from the substrate and covers the active layer .
The driving substrate according to claim 2, wherein the light shielding portion further includes a second light shielding portion located between the substrate and the electrode layer and passing through the first insulation. layer.
The drive substrate according to claim 3, wherein the first light shielding part and the second light shielding part are provided independently of each other; the second light shielding part and the electrode layer are made of the same material and are connected to each other.
The driving substrate according to claim 3, wherein the number of the second light shielding portions is two, and the two second light shielding portions are respectively provided in a direction from the source electrode to the drain electrode. On opposite sides of the active layer; the orthographic projections of the two second light-shielding portions on the first insulating layer cooperate to surround the orthographic projection of the active layer on the first insulating layer.
The drive substrate according to claim 3, further comprising a second insulating layer, the second insulating layer being disposed on a side of the electrode layer away from the substrate; the first light shielding portion includes a first light shielding layer. On the top, the first light-shielding top is disposed on a side of the second insulating layer away from the substrate, and is disposed only corresponding to and covering the active layer.
The driving substrate according to claim 6, wherein the first light-shielding part further includes a first light-shielding side part, the first light-shielding side part is located between the first light-shielding top and the electrode layer, and passes through through the second insulating layer and extending to the surface of the electrode layer.
The drive substrate according to claim 7, wherein the first light-shielding side portion is a ring-shaped structure, and the projection of the active layer on the second insulating layer is located within the ring-shaped structure.
The drive substrate according to claim 7, wherein the first light-shielding top portion and the first light-shielding side portion are integrally formed and made of black insulating material.
The driving substrate according to claim 1, wherein the light shielding portion includes a second light shielding portion located between the substrate and the electrode layer and passing through the first insulating layer. .
The drive substrate according to claim 10, wherein the number of the second light shielding parts is four, two of the four second light shielding parts form a group, and each group of the second light shielding parts is in the The orthographic projection on the first insulating layer cooperates to surround the orthographic projection of the active layer on the first insulating layer.
The driving substrate according to claim 11, wherein one group of the second light shielding portions is disposed close to the gate electrode, and the other group of the second light shielding portions is disposed away from the gate electrode and overlaps the electrode layer, or Tangent settings.
The driving substrate according to claim 11, wherein the second light shielding portion and the electrode layer are made of the same material, and the four second light shielding portions are insulated from each other and are arranged at intervals.
The driving substrate according to claim 11, wherein one set of the second light-shielding parts is made of black insulating material, and the other set of the second light-shielding parts is made of the same material as the electrode layer.
The drive substrate according to claim 10, wherein the number of the second light shielding portions is two, and the orthographic projections of the two second light shielding portions on the first insulating layer cooperate to surround the active layer. Orthographic projection on the first insulating layer; the second light-shielding part is made of black insulating material.
A display panel, wherein the display surface includes a driving substrate and a plurality of inorganic light-emitting diodes, and the driving substrate is the driving substrate according to claim 1.