Flexible display device

Abstract

The invention provides a flexible display device which comprises a driving substrate provided with a flexible stretching area and a rigid area. A main pixel, wherein the main pixel is bonded in the rigid region; the auxiliary pixel units are arranged on the main pixel, and each auxiliary pixel unit comprises a plurality of LEDs (light-emitting diodes); the first driving circuit is arranged on the driving substrate and is used for driving the main pixels to emit light; and the second driving circuit is electrically connected with the first driving circuit and is used for driving the sub-pixel units to emit light after the driving substrate is stretched. Through the overlapping and respective driving design of the main pixel unit and the auxiliary pixel unit, the main pixel is driven to emit light before stretching, and the auxiliary pixel unit is driven to emit light after stretching to a certain degree, so that the pixel density is not reduced after the display device is in a stretching state, and the display fineness is ensured not to generate pixel distortion.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a flexible display device. Background Art

[0002] Micro-LED, as a self-luminous display technology, does not require a backlight and has a simple structure, making it applicable in a variety of scenarios. Stretchable flexible displays are a major application direction, as this technology will greatly improve the playability and portability of displays.

[0003] However, since the distance between pixels is stretched synchronously during the stretching process of the display screen, this will result in different pixel densities before and after stretching, that is, the pixel density is decreasing synchronously, affecting the fineness of the display screen and making pixel distortion more likely to occur. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a flexible display device to overcome the above-mentioned technical problems.

[0005] In a first aspect, the present application provides a flexible display device, comprising: a driving substrate, wherein the driving substrate is provided with a flexible stretching area and a rigid area;

[0006] a primary pixel bonded within the rigid region;

[0007] Sub-pixel units, each of which is provided on the primary pixel and includes a plurality of LEDs;

[0008] a first driving circuit, the first driving circuit being provided on the driving substrate and configured to drive the primary pixel to emit light;

[0009] A second driving circuit is electrically connected to the first driving circuit and is used to drive the sub-pixel unit to emit light after the driving substrate is stretched.

[0010] It can be understood that in this solution, by designing the driving substrate into a flexible area and a rigid area, and designing the main pixel and sub-pixel units to overlap and drive them separately, the main pixel is driven to emit light before stretching, and the sub-pixel unit is driven to emit light after stretching to a certain extent. Since the sub-pixel unit is composed of multiple LEDs, the pixel density of the display device will not decrease after it is in a stretched state, ensuring the fineness of the display and no pixel distortion.

[0011] In a possible embodiment, the plurality of LEDs include a red LED, a green LED, and a blue LED.

[0012] It can be understood that by designing the sub-pixel unit to be composed of three-color LEDs, a flexible and stretchable full-color design can be achieved.

[0013] In a possible embodiment, the main pixel is an LED.

[0014] It is understandable that since the main pixel is only one LED and the sub-pixel unit is composed of multiple LEDs, after stretching, although the spacing between the LEDs becomes larger, the number of LEDs in the sub-pixel unit increases, so that the pixel density after stretching does not decrease, ensuring the fineness of the display without pixel distortion.

[0015] In a possible embodiment, the sub-pixel unit is located directly above the main pixel.

[0016] In a possible embodiment, the main pixel is coated with a first packaging glue;

[0017] The second driving circuit is arranged outside the first packaging glue;

[0018] The sub-pixel unit is bonded to the second driving circuit;

[0019] The sub-pixel unit is coated with a second packaging adhesive.

[0020] In a possible embodiment, it further includes a flexible packaging layer;

[0021] The flexible encapsulation layer is provided on the driving substrate and is used for encapsulating the main pixel and the sub-pixel unit.

[0022] In a second aspect, the present application further provides a flexible display device, comprising:

[0023] a first driving substrate, wherein a first flexible stretching area and a first rigid area are provided on the first driving substrate;

[0024] a primary pixel bonded within the first rigid region;

[0025] a first driving circuit, the first driving circuit being provided on the first driving substrate and being configured to drive the primary pixel to emit light before the flexible display device is stretched;

[0026] a second driving substrate, wherein a second flexible stretching area and a second rigid area are provided on the second driving substrate, and the second driving substrate is arranged opposite to the first driving substrate;

[0027] Auxiliary pixel units, each of which is bonded within the second rigid region, and each of which includes a plurality of LEDs;

[0028] The second driving circuit is provided on the second driving substrate and is used for driving the sub-pixel unit to emit light after the flexible display device is stretched.

[0029] It can be understood that by arranging the main pixel and the sub-pixel unit on different driving substrates respectively, and designing the driving of the main pixel and the sub-pixel unit separately, the main pixel is driven to emit light before stretching, and the sub-pixel unit is driven to emit light after stretching to a certain extent. Since the sub-pixel unit is composed of multiple LEDs, the pixel density of the display device will not decrease after it is in a stretched state, ensuring the fineness of the display and no pixel distortion.

[0030] In a possible embodiment, the secondary pixel unit is disposed opposite to the primary pixel.

[0031] In a possible embodiment, the main pixel is coated with a first packaging glue;

[0032] The sub-pixel unit is coated with a second packaging glue;

[0033] The flexible display device further includes:

[0034] The adhesive layer is disposed between the first packaging adhesive of the main pixel and the second packaging adhesive of the sub-pixel unit that are disposed opposite to each other.

[0035] In a possible embodiment, the secondary pixel unit and the primary pixel are spaced apart.

[0036] Beneficial effects:

[0037] A flexible display device provided in the present application, by overlapping and separately driving the main pixel and sub-pixel units, drives the main pixel to emit light before stretching, and drives the sub-pixel unit to emit light after stretching to a certain extent. This allows the pixel density of the display device to not decrease after being in a stretched state, thereby ensuring the fineness of the display and the absence of pixel distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of a flexible display device provided in one embodiment of the present application;

[0039] Figure 2 for Figure 1 A schematic diagram of the design of a driving circuit in the flexible display device shown;

[0040] Figure 3 A schematic structural diagram of a flexible display device provided in another embodiment of the present application;

[0041] Figure 4 This is a structural diagram of a flexible display device provided in yet another embodiment of the present application.

[0042] Figure numerals: 100-flexible display device; 110-driving substrate; 111-flexible stretching area; 113-rigid area; 120-main pixel; 130-secondary pixel unit; 140-first driving circuit; 150-second driving circuit; 160-first packaging glue; 170-second packaging glue; 180-flexible packaging layer; 200-flexible display device; 210-first driving substrate; 240-second driving substrate; 211-first flexible stretching area; 213-first rigid area; 241-second flexible stretching area; 243-second rigid area; 250-adhesive layer. DETAILED DESCRIPTION

[0043] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0044] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application include direct and indirect connections (couplings) unless otherwise specified. The directional terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediary, or internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of these terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," and so on, in the specification, claims, and drawings of this application are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "include," "may include," "comprise," or "may include" as used in this application indicate the presence of the corresponding functions, operations, components, etc. disclosed, and do not limit the presence or absence of one or more additional functions, operations, components, etc. Furthermore, the terms "include" or "comprising" indicate the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0046] like Figures 1 to 2 , a schematic structural diagram of a flexible display device 100 provided by an embodiment of the present application, wherein the flexible display device 100 includes: a driving substrate 110 , a main pixel 120 , a sub-pixel unit 130 , a first driving circuit 140 and a second driving circuit 150 .

[0047] The driving substrate 110 is a flexible substrate, that is, the driving substrate 110 is composed of a flexible stretching area 111 and a rigid area 113 , and the flexible stretching area 111 and the rigid area 113 are spaced apart.

[0048] That is, the flexible stretching area 111 is used for stretching, and the rigid area 113 is used for bonding the light-emitting device, that is, the rigid area 113 remains rigid and cannot be stretched when the flexible display device 100 is stretched, and the flexible stretching area 111 can be deformed and stretched when the flexible display device 100 is stretched.

[0049] Optionally, the material of the rigid area 113 of the driving substrate 110 may be glass, and the material of the flexible stretching area 111 may be PI substrate.

[0050] The main pixel 120 is bonded in the rigid region 113 and is a micro-light emitting diode (micro-LED). The main pixel is a single LED, such as a red LED, a blue LED, or a green LED.

[0051] It should be understood that one display pixel on the driving substrate 110 is composed of three main pixels.

[0052] Optionally, the sub-pixel unit 130 is disposed on the primary pixel 120 , and each sub-pixel unit 130 includes a plurality of LEDs.

[0053] Optionally, the plurality of LEDs include a red LED, a green LED and a blue LED.

[0054] The light emitting device in the sub-pixel unit 130 is a micro light emitting diode (micro-LED).

[0055] In a possible embodiment, the secondary pixel unit 130 is located directly above the primary pixel 120 .

[0056] That is to say, one main pixel 120 corresponds to one sub-pixel unit 130 (3 LEDs, such as Figure 1 R2, G2, B2 in the diagram).

[0057] Among them, the first driving circuit 140 is provided on the driving substrate 110, and is used to drive the main pixel 120 to emit light; the second driving circuit 150 is electrically connected to the first driving circuit 140, and is used to drive the sub-pixel unit 130 to emit light after the driving substrate 110 is stretched.

[0058] It should be noted that, since there are gaps between the driving circuits, the driving circuits will not block all the light, and the light will pass through the gaps.

[0059] It should be noted that the first drive circuit 140 and the second drive circuit 150 are made of flexible conductive material, and are designed as straight lines in the rigid area of ​​the drive substrate 110 and as curves in the flexible area of ​​the drive substrate 110. When the drive substrate 110 is stretched, the curves are stretched into straight lines, which ensures that the circuits can be properly connected. Figure 2 As shown in (top view), the flexible driving circuit in the flexible stretching area is a curve, and the flexible driving circuit in the rigid area is a straight line.

[0060] In a possible embodiment, the main pixel 120 is coated with a first encapsulation glue 160; the second driving circuit 150 is arranged outside the first encapsulation glue 160; the secondary pixel unit 130 is bonded to the second driving circuit 150; and the secondary pixel unit 130 is coated with a second encapsulation glue 170.

[0061] Optionally, the first packaging adhesive 160 and the second packaging adhesive 170 are rigid packaging adhesives.

[0062] Optionally, the first encapsulant 160 and the second encapsulant 170 are made of transparent epoxy resin or silicone resin to protect the Micro-LED from scratches and oxidation.

[0063] That is, since the first encapsulant 160 and the second encapsulant 170 are made of transparent materials, they will not block the light emitted by the light emitting device.

[0064] In a possible embodiment, the flexible display device 100 further includes a flexible encapsulation layer 180 ; the flexible encapsulation layer 180 is disposed on the driving substrate 110 and is used to encapsulate the primary pixel 120 and the secondary pixel unit 130 .

[0065] Optionally, the flexible encapsulation layer 180 is a transparent flexible polyimide material.

[0066] To sum up, in this embodiment, the flexible display device 100 overlaps and drives the main pixel 120 and the sub-pixel unit 130 separately, so that the main pixel 120 is driven to emit light before stretching, and the sub-pixel unit 130 is driven to emit light after stretching to a certain extent. Since the sub-pixel unit 130 is a plurality of LEDs corresponding to one main pixel 120, the pixel density of the flexible display device 100 is not reduced after being in a stretched state, thereby ensuring the fineness of the display and no pixel distortion.

[0067] Please refer to Figure 3-Figure 4 As shown, the embodiment of the present application further provides another flexible display device 200, which includes: a first driving substrate 210, a main pixel 120, a first driving circuit 140, a second driving substrate 240, a sub-pixel unit 130, and a second driving circuit 150.

[0068] The description of the main pixel 120 , the first driving circuit 140 , the sub-pixel unit 130 , and the second driving circuit 150 may refer to the description of the above embodiment, and will not be repeated here.

[0069] The first driving substrate 210 is provided with a first flexible stretching area 211 and a first rigid area 213 .

[0070] It is understandable that the design of the first driving substrate 210 may refer to the design of the driving substrate 110 , and will not be described in detail herein.

[0071] The first driving circuit 140 is provided on the first driving substrate 210 and is used to drive the main pixel 120 to emit light before the flexible display device 200 is stretched.

[0072] The second driving substrate 240 is provided with a second flexible stretching area 241 and a second rigid area 243 . The second driving substrate 240 is arranged opposite to the first driving substrate 210 .

[0073] Optionally, the sub-pixel units 130 are bonded in the second rigid region 243 of the second driving substrate 240 , and each of the sub-pixel units 130 includes a plurality of LEDs.

[0074] Optionally, the second driving circuit 150 is provided on the second driving substrate 240 , and is configured to drive the sub-pixel unit 130 to emit light after the flexible display device 200 is stretched.

[0075] In a possible embodiment, the secondary pixel unit 130 is disposed opposite to the primary pixel 120. Correspondingly, the second rigid area 243 on the second driving substrate 240 is disposed opposite to the first rigid area 213 on the first driving substrate 210.

[0076] Optionally, the primary pixel 120 is coated with a first encapsulant 160 , and the secondary pixel unit 130 is coated with a second encapsulant 170 . The flexible display device 200 further includes an adhesive layer 250 disposed between the first encapsulant 160 of the primary pixel 120 and the second encapsulant 170 of the secondary pixel unit 130 , that is, used to bond the first encapsulant 160 to the second encapsulant 170 .

[0077] In another possible embodiment, the secondary pixel unit 130 is spaced apart from the primary pixel 120. Correspondingly, the second rigid area 243 on the second drive substrate 240 is spaced apart from the first rigid area 213 on the first drive substrate 210. In this case, the second rigid area 243 on the second drive substrate 240 is directly opposite the second flexible stretch area 241 on the first drive substrate 210. In this case, the secondary pixel unit 130 is located in the gap between the primary pixels 120.

[0078] In a possible embodiment, the flexible display device 200 further includes a flexible encapsulation layer 180 ; the flexible encapsulation layer 180 is disposed between the first driving substrate 210 and the second driving substrate 240 .

[0079] In summary, in this embodiment, in the unstretched state, only the first driving substrate 210 drives the main pixel Micro-LED to emit light. After being stretched to a certain extent, the first driving substrate 210 stops working and only the second driving substrate 240 drives the secondary pixel unit 130 to emit light. Therefore, the pixel density is not reduced after stretching, ensuring the fineness of the display without pixel distortion.

[0080] It should be understood that the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise specifically defined.

[0081] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0082] It should be understood that the application of this application is not limited to the above examples. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the scope of protection of the claims appended to this application. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments and making equivalent changes in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A flexible display device, characterized in that: include: A driving substrate, wherein the driving substrate is provided with a flexible stretching area and a rigid area; a primary pixel bonded within the rigid region; A secondary pixel unit, each of which is provided on the primary pixel and includes a plurality of LEDs; a first driving circuit, the first driving circuit being provided on the driving substrate and being used to drive the primary pixel to emit light; A second driving circuit is electrically connected to the first driving circuit and is used to drive the sub-pixel unit to emit light after the driving substrate is stretched.

2. The flexible display device according to claim 1, wherein: The plurality of LEDs include a red LED, a green LED and a blue LED.

3. The flexible display device according to claim 2, wherein: The main pixel is an LED.

4. The flexible display device according to claim 3, wherein: The sub-pixel unit is located directly above the main pixel.

5. The flexible display device according to claim 4, wherein: The main pixel is coated with a first packaging glue; The second driving circuit is arranged outside the first packaging glue; The sub-pixel unit is bonded to the second driving circuit; The sub-pixel unit is coated with a second packaging adhesive.

6. The flexible display device according to claim 1, wherein: Also included is a flexible encapsulation layer; The flexible encapsulation layer is provided on the driving substrate and is used for encapsulating the main pixel and the sub-pixel unit.

7. A flexible display device, characterized in that: include: a first driving substrate, wherein a first flexible stretching area and a first rigid area are provided on the first driving substrate; a primary pixel bonded within the first rigid region; a first driving circuit, the first driving circuit being provided on the first driving substrate and being configured to drive the primary pixel to emit light before the flexible display device is stretched; a second driving substrate, wherein a second flexible stretching area and a second rigid area are provided on the second driving substrate, and the second driving substrate is arranged opposite to the first driving substrate; Sub-pixel units, each of which is bonded within the second rigid region and includes a plurality of LEDs; The second driving circuit is provided on the second driving substrate and is used for driving the sub-pixel unit to emit light after the flexible display device is stretched.

8. The flexible display device according to claim 7, wherein: The secondary pixel unit is arranged opposite to the primary pixel.

9. The flexible display device according to claim 8, wherein: The main pixel is coated with a first packaging glue; The sub-pixel unit is coated with a second packaging glue; The flexible display device further includes: The adhesive layer is disposed between the first packaging adhesive of the main pixel and the second packaging adhesive of the sub-pixel unit that are disposed opposite to each other.

10. The flexible display device according to claim 7, wherein: The secondary pixel unit is spaced apart from the primary pixel.

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