Display panel and electronic device

Abstract

The present disclosure provides a display panel and an electronic device, wherein the display panel includes: a back film, a base layer, a light-emitting unit layer, and an auxiliary electrode layer; wherein the light-emitting unit layer is arranged on the first surface of the base layer, and the light-emitting unit layer includes at least an anode layer, a light-emitting layer, and a cathode layer arranged in sequence, and the cathode layer is electrically connected to the pins arranged in the binding area of the first surface; the back film is arranged on the second surface of the base layer opposite to the first surface, the auxiliary electrode layer is arranged between the back film and the base layer, and a conductive glue mixed with thorn-like particles is coated on the position of the auxiliary electrode layer corresponding to the binding area, so that the thorn-like particles pierce the base layer and are electrically connected to the pins. The present disclosure adds an auxiliary electrode layer to the display panel structure, utilizes the hard thorn-like particles mixed in the conductive glue to achieve the rupture and conduction of the base layer, and conveniently and quickly achieves the connection between the cathode layer and the auxiliary electrode layer through the pin design of the binding area, thereby achieving the purpose of reducing the cathode resistance.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and an electronic device. Background Art

[0002] Organic Light-Emitting Diode (OLED) display devices have the characteristics of high contrast, wide color gamut, and ultra-lightness and ultra-thinness. Therefore, they are increasingly used in various display products. As users' demand for large-size display devices continues to increase, how to better optimize large-size display devices has become an urgent problem that developers need to solve.

[0003] At present, when using OLED display panels for large-size displays, the OLED's light-emitting unit is usually set as a top-emitting unit. When using a top-emitting unit, the light emitted by the light-emitting layer needs to penetrate the cathode layer to be emitted. Therefore, the cathode layer needs to be made as thin as possible to reduce the transmittance of the cathode layer. However, at this time, there will be problems of increased cathode resistance and increased voltage drop, which will lead to an increase in the overall power consumption of the display panel, which is not conducive to the overall optimization of the product. Summary of the Invention

[0004] The purpose of the embodiments of the present disclosure is to provide a display panel and an electronic device to solve the problem of large cathode resistance and increased power consumption of large-size OLED display panels in the prior art.

[0005] The embodiments of the present disclosure adopt the following technical solution: a display panel, comprising at least: a back film, a base layer, a light-emitting unit layer and an auxiliary electrode layer; wherein the light-emitting unit layer is arranged on the first surface of the base layer, and the light-emitting unit layer comprises at least an anode layer, a light-emitting layer and a cathode layer arranged in sequence, and the cathode layer is electrically connected to the pins arranged in the binding area of the first surface; the back film is arranged on the second surface of the base layer opposite to the first surface, the auxiliary electrode layer is arranged between the back film and the base layer, and a conductive glue with mixed thorn-like particles is coated at the position of the auxiliary electrode layer corresponding to the binding area, so that the thorn-like particles are electrically connected to the pins after piercing the base layer.

[0006] In some embodiments, the thorn-like particles are spheres or polyhedrons with protrusions on the surface.

[0007] In some embodiments, the spiny particles are made of nickel-gold based materials.

[0008] In some embodiments, the circumscribed sphere diameter of the spiny particle is less than or equal to the thickness of the base layer.

[0009] In some embodiments, the thickness of the base layer is less than or equal to 5 microns; the particle size of the thorn-like particles is between 2 and 4 microns, and the length of the thorns of the thorn-like particles is between 0.2 and 1 micron.

[0010] In some embodiments, the back film and the base layer further include: a frame sealing glue arranged around the auxiliary electrode layer.

[0011] In some embodiments, the base layer includes at least: a first base layer close to the back film side and a second base layer close to the light-emitting unit layer, the cathode layer is electrically connected to the pins set in the binding area on the surface of the second base layer away from the first base layer; the auxiliary electrode layer is arranged between the first base layer and the second base layer, and a conductive glue with mixed thorn-like particles is coated at the position of the auxiliary electrode layer corresponding to the binding area, so that the thorn-like particles are electrically connected to the pins after piercing the second base layer.

[0012] In some embodiments, the thorn-like particles pierce the substrate layer or the second substrate layer under heat and pressure conditions.

[0013] In some embodiments, the hot pressing condition at least includes: applying a pressure of 0.1 to 1 Newton to the auxiliary electrode layer for 10 to 20 seconds under a preparation environment of 280 to 300 degrees Celsius.

[0014] An embodiment of the present disclosure further provides an electronic device, which at least includes the display panel as described above.

[0015] The beneficial effects of the embodiments of the present disclosure are: by adding an auxiliary electrode layer to the display panel structure, the base layer is broken and conductive by using hard thorn-like particles mixed in the conductive glue, and the connection between the cathode layer and the auxiliary electrode layer is conveniently and quickly achieved through the pin design of the binding area, thereby achieving the purpose of reducing the cathode resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 Schematic diagram of the hierarchical structure of the display panel in the first embodiment of the present disclosure;

[0018] Figure 2 Schematic diagram of the pattern design of the auxiliary electrode layer in the first embodiment of the present disclosure;

[0019] Figure 3 FIG. 1 is another schematic diagram of a hierarchical structure of a display panel in the first embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] Various aspects and features of the present disclosure are described herein with reference to the accompanying drawings.

[0021] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0023] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0024] It should also be understood that although the present disclosure has been described with reference to certain specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features of the claims and are therefore within the scope of protection defined thereby.

[0025] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0026] Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant detail. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but rather serve merely as a basis and representative basis for teaching those skilled in the art to variously employ the present disclosure with substantially any suitable detailed structure.

[0027] This description may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," each of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0028] OLED display devices have the characteristics of high contrast, high color gamut, ultra-lightness and ultra-thinness, and are therefore increasingly used in various display products. As users' demand for large-size display devices continues to increase, how to better optimize large-size display devices has become an urgent problem that developers need to solve.

[0029] At present, when using OLED display panels for large-size displays, the OLED's light-emitting unit is usually set as a top-emitting unit. When using a top-emitting unit, the light emitted by the light-emitting layer needs to penetrate the cathode layer to be emitted. Therefore, the cathode layer needs to be made as thin as possible to reduce the transmittance of the cathode layer. However, at this time, there will be problems of increased cathode resistance and increased voltage drop, which will lead to an increase in the overall power consumption of the display panel, which is not conducive to the overall optimization of the product.

[0030] In order to solve the above problems, the first embodiment of the present disclosure provides a display panel, which can be specifically an OLED display panel. The display panel is divided into a display area and a peripheral area arranged around the display area, wherein the display area is mainly used to set the light-emitting unit (pixel) and the control circuit for realizing the display of the picture, and the peripheral area is mainly used to arrange the wiring to realize the driving of the light-emitting unit and the control circuit.

[0031] For general OLED display panels, during their preparation, layers such as a base layer (PI base), a thin-film transistor layer, a light-emitting layer, and an encapsulation layer are typically prepared sequentially on a glass substrate. The glass substrate is then peeled off and the remaining layers are supported by a backing film to form a hierarchical structure for the display panel. This embodiment adds an auxiliary electrode layer to the aforementioned hierarchical structure and utilizes hard, thorny particles to achieve connectivity between the auxiliary electrode layer and the cathode layer. This simple and convenient design reduces cathode resistance, achieving the goal of controlling power consumption in large-scale display panels.

[0032] Figure 1 FIG. 1 shows a schematic diagram of the hierarchical structure of the display panel provided in this embodiment. Figure 1 As shown, the display panel mainly includes a back film 10, a base layer 20, a light emitting unit layer 40 and an auxiliary electrode layer 50. In addition, Figure 1 The figure also shows a thin film transistor layer 30 disposed between the base layer 20 and the light emitting unit layer 40. The preparation method and actual hierarchical structure of the back film 10, base layer 20, thin film transistor layer 30 and light emitting unit layer 40 in this embodiment can directly use existing technology, wherein, Figure 1 The p-Si shown in the figure represents the active layer in the thin film transistor layer 30, gate corresponds to the gate layer, SD corresponds to the source metal / drain metal, GI corresponds to the interlayer insulating layer, ILD corresponds to the inorganic insulating layer, and PLN corresponds to the flat layer; the light emitting unit layer 40 is provided on the first surface of the base layer 20 ( Figure 1The upper surface of the base layer 20 in the middle) mainly includes an anode layer 41, a light-emitting layer 42 and a cathode layer 43. The PDL corresponds to the pixel definition layer in the light-emitting unit layer 40, and the PS corresponds to the support structure. The light-emitting unit layer 40 may also include a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer and other functional layers. Figure 1 (not shown); TFE corresponds to the encapsulation layer of the display panel. Furthermore, a buffer layer may be provided between the base layer 20 and the thin-film transistor layer 30. A binding region is provided in the base layer 20 corresponding to the peripheral region to achieve a binding connection between the display panel and the driver IC. Metal pins 60 are provided in the binding region, and the pins 60 are electrically connected to the cathode layer 43 via metal traces 61.

[0033] The auxiliary electrode layer 50 is actually a patterned metal layer or a conductive trace layer made of a conductive material. Its pattern is not particularly limited and can usually be set in combination with the display area size of the display panel, the thickness limit of the display panel, and the need to reduce the cathode resistance. In actual implementation, the auxiliary electrode layer 50 can be a layer prepared on the surface of the back film 10 by printing, silk screen printing or sputtering. The pattern formed on the back film 10 can be as follows: Figure 2 As shown, it should be noted that, although the present embodiment does not limit the pattern formed by the auxiliary electrode layer 50, it is necessary to ensure that the auxiliary electrode is provided at the position corresponding to the binding area after lamination, that is, the orthographic projection of the binding area on the back film 10 and the orthographic projection of the auxiliary electrode layer on the back film 10 have an overlapping area. At this time, a conductive glue mixed with thorn-like particles 51 is coated at the position corresponding to the binding area in the auxiliary electrode layer 50 ( Figure 1 (not shown in the figure), during the bonding process between the back film 10 and the base layer 20, the thorn-like particles 51 pierce the base layer 20 to connect with the pins 60 set on its first surface, and the pins 60 are used as a connection transit to finally achieve the connection between the cathode layer 43 and the auxiliary electrode layer 50.

[0034] Specifically, the back film 10 is disposed on the second surface (ie, the second surface) of the base layer 20 opposite to the first surface. Figure 1On one side of the lower surface of the base layer 20 in the middle), the surface on which the auxiliary electrode layer 50 is prepared is in contact with the second surface of the base layer 20. After a conductive glue mixed with thorn-like particles 51 is applied to the position corresponding to the binding area in the auxiliary electrode layer 50, the back film 10 and the base layer 20 are bonded under hot pressing conditions, so that the thorn-like particles 51 pierce the base layer 20 under hot pressing conditions. In some embodiments, the hot pressing conditions can be to apply a pressure of 0.1 to 1 Newton to the back film 10 under a preparation environment of 280 to 300 degrees Celsius and continue for 10 to 20 seconds. At this time, the thorn-like particles 51 will pierce the base layer 20, thereby realizing the electrical connection between the pins 60 in the binding area and the auxiliary electrode layer 50. In actual implementation, the pressure is generally selected to be 0.2 Newton, the temperature is selected to be 260 degrees Celsius, and the time is 16 seconds. Of course, the above conditions can also be adjusted according to actual conditions, and this embodiment is not limited here.

[0035] The thorn-like particles 51 are spheres or polyhedrons with protrusions on their surfaces. The protrusions are generally in the shape of cones or prisms with relatively sharp edges. The material of the thorn-like particles 51 can be nickel-gold or other materials with good conductivity and hardness, as long as they can maintain their hardness and pierce the base layer 20 under hot pressing conditions. When used, the thorn-like particles 51 are mixed into the conductive adhesive and initially fixed to the base layer 20 by the conductive adhesive. The base layer is then pierced by hot pressing.

[0036] Accordingly, to ensure the bursting effect of the thorn-like particles 51, the size of the thorn-like particles 51 can be set according to the thickness of the base layer 20 during preparation. In this embodiment, the diameter of the circumscribed sphere of the thorn-like particles 51 can be set to be less than or equal to the thickness of the base layer 20, preferably close to the thickness of the base layer 20, to ensure that the protrusion of the thorn-like particles 51 can directly burst the entire base layer 20. In actual implementation, the size of the thorn-like particles 51 can also be adjusted according to the specific material and shape of the thorn-like particles 51. At the same time, to ensure a good bursting effect, in some embodiments, the thickness of the base layer 20 can be limited to a certain extent, for example, setting its thickness to 5 microns or less. In this case, the particle size of the thorn-like particles 51 can be set between 2 and 4 microns. The length of the thorns distributed on the surface of the thorn-like particles 51 can be between 0.2 and 1 micron, so that a certain amount of thorn-like particles 51 mixed in the conductive adhesive can achieve a better bursting effect on the base layer 20 under hot pressing conditions.

[0037] In some embodiments, a sealant 70 is further provided between the back film 10 and the base layer 20 and surrounding the auxiliary electrode layer 50. Figure 2As shown, the sealant 70 is mainly used to seal the back film 10 and the base layer 20 after the back film 10 is attached, so as to ensure that water and oxygen in the external environment will not corrode the auxiliary electrode layer 50 and prevent the display panel from malfunctioning.

[0038] In some embodiments, the base layer 20 can be divided into a first base layer 21 close to the back film 10 and a second base layer 22 close to the light emitting unit layer 40. Figure 3 As shown, in this case, the cathode layer 43 is electrically connected to the pin 60 provided in the binding area on the surface of the second substrate layer 22 away from the first substrate layer 21, and the auxiliary electrode layer 50 is not prepared on the back film 10, and it can be directly bonded to the surface of the first substrate layer 21 away from the second substrate layer 22. At this time, the auxiliary electrode layer 50 is provided between the first substrate layer 21 and the second substrate layer 22, which is actually equivalent to preparing the auxiliary electrode layer 50 on the surface of the first substrate layer 21, and applying a conductive glue mixed with thorn-like particles 51 at the position corresponding to the binding area. When the first substrate layer 21 and the second substrate layer 22 are bonded together, the thorn-like particles 51 are made to pierce the second substrate layer 22 under hot pressing conditions to achieve electrical connection between the auxiliary electrode layer 50 and the pin 60.

[0039] It should be noted that the first base layer 21 and the second base layer 22 may further include Figure 3 The intermediate barrier layer shown is used to protect the auxiliary electrode layer 50; in addition, a sealant 70 may be provided between the first base layer 21 and the second base layer 22 ( Figure 3 (not shown) to isolate water and oxygen, thus protecting the display panel. Figure 3 In the cross-sectional view shown, the cathode 43 can directly contact the upper surface of the second base layer 22, so the thorn-like particles 51 can directly electrically connect to the cathode layer 43 after piercing the second base layer 22. Of course, in actual use, other hierarchical designs can also be made with reference to different positions and different structures between levels in the display panel, as long as it is ensured that the cathode can be connected to the auxiliary electrode layer.

[0040] This embodiment adds an auxiliary electrode layer to the display panel structure, utilizes hard thorn-like particles mixed in the conductive glue to achieve the breakthrough and conduction of the base layer, and conveniently and quickly realizes the connection between the cathode layer and the auxiliary electrode layer through the pin design of the binding area, thereby achieving the purpose of reducing the cathode resistance.

[0041] The second embodiment of the present disclosure provides an electronic device, which can be a display device with a display function, especially a smartphone, tablet computer or TV with a larger screen size, which at least includes the display panel provided by the first embodiment of the present disclosure to reduce the cathode resistance in the display panel, thereby reducing the overall power consumption of the display panel, thereby improving the power consumption of the electronic device and further improving the battery life of the electronic device.

[0042] The above describes in detail multiple embodiments of the present disclosure, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should all fall within the scope of protection claimed by the present disclosure.

Claims

1. A display panel, characterized in that: At least: Back film, base layer, light emitting unit layer and auxiliary electrode layer; wherein, The light-emitting unit layer is arranged on the first surface of the base layer, and the light-emitting unit layer at least includes an anode layer, a light-emitting layer, and a cathode layer arranged in sequence, and the cathode layer is electrically connected to the pins arranged in the binding area of the first surface; The back film is arranged on the second surface of the base layer opposite to the first surface, the auxiliary electrode layer is arranged between the back film and the base layer, and a conductive glue mixed with thorn-like particles is coated on the position of the auxiliary electrode layer corresponding to the binding area, so that the thorn-like particles can pierce the base layer and be electrically connected to the pin.

2. The display panel according to claim 1, wherein: The thorn-like particles are spheres or polyhedrons with protrusions on the surface.

3. The display panel according to claim 2, wherein: The thorn-shaped particles are made of nickel-gold material.

4. The display panel according to claim 2, wherein: The circumscribed sphere diameter of the thorn-like particles is smaller than or equal to the thickness of the base layer.

5. The display panel according to claim 4, wherein: The thickness of the base layer is less than or equal to 5 microns; The particle size of the thorn-like particles is between 2 and 4 microns, and the length of the thorns of the thorn-like particles is between 0.2 and 1 micron.

6. The display panel according to claim 1, wherein: Also included between the back film and the base layer is a frame sealing adhesive arranged around the auxiliary electrode layer.

7. The display panel according to claim 1, wherein: The base layer comprises at least: a first base layer close to the back film and a second base layer close to the light-emitting unit layer, the cathode layer being electrically connected to pins provided in a binding area on a surface of the second base layer away from the first base layer; The auxiliary electrode layer is arranged between the first base layer and the second base layer, and a conductive glue mixed with thorn-like particles is coated at a position of the auxiliary electrode layer corresponding to the binding area, so that the thorn-like particles pierce the second base layer and are electrically connected to the pins.

8. The display panel according to claim 7, wherein: The thorn-like particles pierce the base layer or the second base layer under hot pressing conditions.

9. The display panel according to claim 8, wherein: The hot pressing conditions at least include: applying a pressure of 0.1 to 1 Newton to the auxiliary electrode layer for 10 to 20 seconds under a preparation environment of 280 to 300 degrees Celsius.

10. An electronic device, characterized in that: The device comprises at least the display panel according to any one of claims 1 to 9.

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