A flexible OLED display panel with a fluorescent light emitting layer

Abstract

The application belongs to the technical field of display, and particularly relates to a flexible OLED display panel with a fluorescent light-emitting layer, which comprises a flexible substrate, a buffer layer prepared on the flexible substrate, a thin film transistor layer prepared on the buffer layer, a fluorescent light-emitting layer prepared on the thin film transistor layer, and a heat dissipation layer prepared on the side surface around the fluorescent light-emitting layer, wherein a plurality of uniformly distributed heat dissipation through holes are arranged in the heat dissipation layer, and a plurality of first silicon grease particles are evenly filled on both sides of each heat dissipation through hole; a first encapsulation layer is prepared on the fluorescent light-emitting layer, and the first encapsulation layer covers the surface of the fluorescent light-emitting layer and the heat dissipation layer. The application solves the problems of high heat generation and poor heat dissipation of the OLED display panel, and prolongs the service life of the OLED display panel.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display, and particularly relates to a flexible OLED display panel with a fluorescent light-emitting layer. BACKGROUND

[0002] Compared with many display devices, the OLED display panel has many advantages such as active light-emitting, high contrast, no viewing angle limitation, and the like. In particular, the flexible OLED display panel has more obvious advantages. The flexible OLED display panel is not only more lightweight in volume, but also has lower power consumption than the original device, which helps to improve the endurance of the equipment. At the same time, based on the characteristics of being bendable and having good flexibility, the durability of the flexible OLED display panel is also greatly higher than that of the previous screen, thereby reducing the probability of accidental damage to the equipment. Therefore, the flexible OLED display panel has been widely used in the technical field of display, and will become the mainstream of OLED display consumption in the future. However, the service life of the OLED element in the flexible OLED display panel is an important bottleneck for its development.

[0003] However, the service life of the OLED element in the flexible OLED display panel is an important bottleneck for its development. On the one hand, in the process of developing flexible OLED display technology, when the flexible OLED display panel is rolled up, the bending stress of the barrier layer is different at different positions. In the area with a larger bending degree, the barrier layer is prone to cracking, which affects the packaging effect. On the other hand, the OLED display panel generates a lot of heat, which is a problem for the service life of the OLED display panel. SUMMARY

[0004] The present application provides a flexible OLED display panel with a fluorescent light-emitting layer, which aims to solve the problem that the barrier layer in the existing flexible OLED display panel is prone to cracking and generates a lot of heat, thereby affecting the service life of the OLED display panel.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a flexible OLED display panel with a fluorescent light-emitting layer comprises:

[0006] a flexible substrate;

[0007] a buffer layer prepared on the flexible substrate;

[0008] a thin film transistor layer prepared on the buffer layer;

[0009] a fluorescent light-emitting layer prepared on the thin film transistor layer;

[0010] A heat dissipation layer is formed on the sides of the fluorescent light-emitting layer, wherein the heat dissipation layer is provided with a plurality of evenly distributed heat dissipation holes, and both sides of each heat dissipation hole are evenly and equally filled with a plurality of first silicone grease particles;

[0011] a first encapsulation layer, wherein the first encapsulation layer is prepared on the fluorescent light-emitting layer, and the first encapsulation layer covers the surfaces of the fluorescent light-emitting layer and the heat dissipation layer;

[0012] Sealing heat dissipation adhesive, the sealing heat dissipation adhesive is arranged on the sides of the OLED display panel, the sealing heat dissipation adhesive comprises UV adhesive and second silicone grease particles evenly distributed in the UV adhesive;

[0013] A barrier layer, the barrier layer being formed on the sides of the first encapsulation layer, the barrier layer comprising a plurality of discontinuous barrier units, and the plurality of barrier units being arranged in a chain;

[0014] A second encapsulation layer is prepared on the barrier layer, and the second encapsulation layer covers the surfaces of the first encapsulation layer and the barrier layer.

[0015] Preferably, the sealing heat dissipation adhesive includes a first sealing heat dissipation adhesive layer and a second sealing heat dissipation adhesive layer distributed from a side close to the OLED display panel to the outside, and the first sealing heat dissipation adhesive layer and the second sealing heat dissipation adhesive layer are both filled with the second silicone grease particles with different concentrations.

[0016] Preferably, the number of the second silicone grease particles in the first sealing heat dissipation adhesive layer is less than the number of the second silicone grease particles in the second sealing heat dissipation adhesive layer.

[0017] Preferably, the sealing heat dissipation adhesive covers side surfaces of the flexible substrate, the buffer layer, the thin film transistor layer and the fluorescent light-emitting layer.

[0018] Preferably, the flexible substrate includes a first polyimide layer and a second polyimide layer arranged in sequence, the upper surface of the first polyimide layer has a plurality of first raised top surfaces arranged evenly and equidistantly, and the lower surface of the second polyimide layer forms a concave-convex matching structure with the first raised top surface on the first polyimide layer.

[0019] Preferably, the buffer layer includes a first buffer layer and a second buffer layer arranged in sequence, the upper surface of the first buffer layer has a number of second raised top surfaces arranged evenly and equidistantly, the lower surface of the second buffer layer has a number of third raised top surfaces arranged evenly and equidistantly and staggered with the second raised top surfaces on the first buffer layer, the second raised top surfaces on the first buffer layer form a concave-convex matching structure with the lower surface of the second buffer layer, and the third raised top surfaces on the second buffer layer form a concave-convex matching structure with the upper surface of the first buffer layer.

[0020] Preferably, the first silicone grease particles and the second silicone grease particles are the same heat-absorbing particles.

[0021] Preferably, the barrier layer includes a plurality of first barrier units and a plurality of second barrier units, the first barrier units and the second barrier units are both C-shaped, and adjacent first barrier units and second barrier units are connected end to end.

[0022] Preferably, one end of the sealing heat dissipation adhesive extends at least to the lower surface of the flexible substrate, and the other end of the sealing heat dissipation adhesive extends at least to the side surface of the first packaging layer.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the heat generated during the light emission of the fluorescent light-emitting layer is guided to the sealing heat dissipation adhesive through the heat dissipation through-holes in the heat dissipation layer, the first silicone grease particles in the heat dissipation layer also absorb heat into the sealing heat dissipation adhesive, and the second silicone grease particles in the sealing heat dissipation adhesive absorb the heat and dissipate it to the outside, thereby solving the problem of excessive heat generation and poor heat dissipation of the OLED display panel and extending the service life of the OLED display panel; by forming a concave-convex matching structure between the first polyimide layer and the second polyimide layer through the first convex top surface, and forming a concave-convex matching structure between the first buffer layer and the second buffer layer, the heat dissipation of the first polyimide layer is increased. The area of ​​the contact surface between the imide layer and the second polyimide layer also increases the area of ​​the contact surface between the first buffer layer and the second buffer layer, thereby eliminating and dispersing the stress generated by each film layer during the bending process, and realizing the bending and folding characteristics of the flexible OLED display panel; the barrier layer effectively blocks the diffusion of the first encapsulation layer, so that the first encapsulation layer plays a role in blocking water and oxygen on the periphery of the OLED device, and when the flexible OLED display panel is curled, the stress on the first encapsulation layer in contact with the barrier layer has space to be released, which is conducive to eliminating stress and preventing the first encapsulation layer from falling off or being damaged due to the curling of the flexible OLED display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 Schematic diagram of the internal structure of the present invention;

[0026] Figure 3 Structure diagram of the barrier layer of the present application;

[0027] In the figure: 1-flexible substrate, 11-first polyimide layer, 111-first convex top surface, 12-second polyimide layer, 2-buffer layer, 21-first buffer layer, 211-second convex top surface, 22-second buffer layer, 221-third convex top surface, 3-thin film transistor layer, 4-fluorescent light emitting layer, 5-heat dissipation layer, 51-heat dissipation through hole, 52-first silicone particle, 6-first encapsulation layer, 7-sealing heat dissipation glue, 71-first sealing heat dissipation glue layer, 72-second sealing heat dissipation glue layer, 73-second silicone particle, 8-barrier layer, 81-first barrier unit, 82-second barrier unit, 9-second encapsulation layer. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Please refer to Figure 1-3 The present application provides a technical solution: a flexible OLED display panel with a fluorescent light emitting layer, comprising:

[0030] Flexible substrate 1;

[0031] Buffer layer 2 prepared on flexible substrate 1;

[0032] Thin film transistor layer 3 prepared on buffer layer 2;

[0033] Fluorescent light emitting layer 4 prepared on thin film transistor layer 3;

[0034] Heat dissipation layer 5 prepared on the side surface around the fluorescent light emitting layer 4, wherein a plurality of heat dissipation through holes 51 are uniformly distributed in the heat dissipation layer 5, and a plurality of first silicone particles 52 are evenly and equidistributed on both sides of each heat dissipation through hole 51;

[0035] First encapsulation layer 6 prepared on the fluorescent light emitting layer 4, and the first encapsulation layer 6 covers the surface of the fluorescent light emitting layer 4 and the heat dissipation layer 5;

[0036] Sealing heat dissipation glue 7 is arranged on the side surface around the OLED display panel, and the sealing heat dissipation glue 7 comprises UV glue and second silicone particles 73 uniformly distributed in the UV glue;

[0037] A barrier layer 8 is prepared on the side surface around the first encapsulation layer 6, and the barrier layer 8 comprises a plurality of discontinuous barrier units arranged in a chain shape.

[0038] A second encapsulation layer 9 is prepared on the barrier layer 8, and the second encapsulation layer 9 covers the surface of the first encapsulation layer 6 and the barrier layer 8.

[0039] In the embodiment, the heat generated by the fluorescent light emitting layer 4 is dissipated to the surroundings, and the heat generated by the operation of other devices in the OLED display panel can also be part of the total heat, which can be dissipated to the sealing heat dissipation adhesive 7 through the heat dissipation through holes 51 in the heat dissipation layer 5. The heat dissipation layer 5 is a film layer for heat dissipation around the side surface of the fluorescent light emitting layer 4, and a plurality of heat dissipation through holes 51 are uniformly distributed around the heat dissipation layer 5, which is conducive to uniformly dissipating the heat through the heat dissipation through holes 51. The first silicone particles 52 are arranged on both sides of each heat dissipation through hole 51, which can absorb another part of the heat. The first silicone particles 52 conduct the absorbed heat to the sealing heat dissipation adhesive 7, and the second silicone particles 73 mixed in the UV adhesive in the sealing heat dissipation adhesive 7 can absorb and dissipate the conducted heat to the outside, so as to dissipate the heat generated in the OLED display panel and prolong the service life of the OLED display panel. The barrier layer 8 is used to effectively block the diffusion of the first encapsulation layer 6 when the OLED display panel is rolled up, so as to prevent the first encapsulation layer 6 from falling off or being damaged due to the rolling of the flexible OLED display panel. The plurality of discontinuous barrier units arranged in a chain shape provide a space for the stress on the first encapsulation layer 6 in contact with the barrier layer 8 to be released, which is conducive to eliminating the stress.

[0040] Further, the sealing heat dissipation adhesive 7 comprises a first sealing heat dissipation adhesive layer 71 and a second sealing heat dissipation adhesive layer 72 distributed from the side close to the OLED display panel to the outside, and the first sealing heat dissipation adhesive layer 71 and the second sealing heat dissipation adhesive layer 72 are filled with second silicone particles 73 with different concentrations.

[0041] In the embodiment, the heat is absorbed by the second silicone particles 73 in the first sealing heat dissipation adhesive layer 71 through the heat dissipation layer 5, and the second silicone particles 73 in the second sealing heat dissipation adhesive layer 72 absorb the heat in the first sealing heat dissipation adhesive layer 71 and finally dissipate it to the outside.

[0042] Further, the number of second silicone particles 73 in the first sealing heat dissipation adhesive layer 71 is less than the number of second silicone particles 73 in the second sealing heat dissipation adhesive layer 72.

[0043] In this embodiment, the number of second silicone grease particles 73 in the first sealing heat dissipation adhesive layer 71 is small, and the number of second silicone grease particles 73 in the second sealing heat dissipation adhesive layer 72 is large. The heat absorption capacity of the first sealing heat dissipation adhesive layer 71 is weaker than that of the second sealing heat dissipation adhesive layer 72, so that heat can be absorbed into the second sealing heat dissipation adhesive layer 72 as much as possible.

[0044] Furthermore, the sealing heat dissipation adhesive 7 covers the side surfaces of the flexible substrate 1 , the buffer layer 2 , the thin film transistor layer 3 and the fluorescent light emitting layer 4 .

[0045] In this embodiment, water vapor is prevented from entering the OLED display panel from the sides of the flexible substrate 1 , the buffer layer 2 , the thin film transistor layer 3 and the fluorescent light emitting layer 4 due to poor water vapor recombination between layers.

[0046] Furthermore, the flexible substrate 1 includes a first polyimide layer 11 and a second polyimide layer 12 arranged in sequence, the upper surface of the first polyimide layer 11 has a plurality of first convex top surfaces 111 arranged uniformly and equidistantly, and the lower surface of the second polyimide layer 12 forms a concave-convex matching structure with the first convex top surfaces 111 on the first polyimide layer 11.

[0047] In this embodiment, the lower surface of the second polyimide layer 12 and the first raised top surface 111 on the first polyimide layer 11 form a concave-convex matching structure, which increases the contact area between the second polyimide layer 12 and the first polyimide layer 11, which is beneficial to dispersing and eliminating the stress generated during the bending process.

[0048] Furthermore, the buffer layer 2 includes a first buffer layer 21 and a second buffer layer 22 arranged in sequence, the upper surface of the first buffer layer 21 has a plurality of second raised top surfaces 211 arranged uniformly and equidistantly, the lower surface of the second buffer layer 22 has a plurality of third raised top surfaces 221 arranged uniformly and equidistantly and staggered with the second raised top surfaces 211 on the first buffer layer 21, the second raised top surfaces 211 on the first buffer layer 21 form a concave-convex matching structure with the lower surface of the second buffer layer 22, and the third raised top surfaces 221 on the second buffer layer 22 form a concave-convex matching structure with the upper surface of the first buffer layer 21.

[0049] In this embodiment, the first buffer layer 21 and the second buffer layer 22 form a concave-convex structure through the second raised top surface 211 with an interval and staggered interval, and the third raised top surface 221 forms a concave-convex structure with the first buffer layer 21, thereby increasing the contact area between the first buffer layer 21 and the second buffer layer 22, which is beneficial to dispersing and eliminating the stress generated during the bending process.

[0050] Furthermore, the first silicone grease particles 52 and the second silicone grease particles 73 are the same heat-absorbing particles.

[0051] In this embodiment, the first silicone grease particles 52 and the second silicone grease particles 73 have the same heat absorption capacity.

[0052] Furthermore, the barrier layer 8 includes a plurality of first barrier units 81 and a plurality of second barrier units 82 . The first barrier units 81 and the second barrier units 82 are both C-shaped, and adjacent first barrier units 81 and second barrier units 82 are connected end to end.

[0053] In this embodiment, when the flexible OLED display panel is curled, the multiple first blocking units 81 and the multiple second blocking units 82 can bend relative to each other, so that the stress on the first encapsulation layer 3 in contact with the barrier layer 8 caused by the curling of the flexible OLED display panel has space to release, and the barrier layer 4 has a better resistance to bending stress, thereby enhancing the rollability of the flexible OLED display panel.

[0054] Furthermore, one end of the sealing heat dissipation adhesive 7 extends at least to the lower surface of the flexible substrate 1 , and the other end of the sealing heat dissipation adhesive 7 extends at least to the side surface of the first packaging layer 6 .

[0055] In this embodiment, water vapor is prevented from entering the OLED display panel through the gap formed by poor recombination between the fluorescent light-emitting layer 4 and the first encapsulation layer.

[0056] The working principle and use process of the present invention: After the present invention is installed, the heat generated by the fluorescent light-emitting layer 4 is dissipated to the surroundings. The operation of other devices in the OLED display panel will also generate heat. A part of the total heat generated can be dissipated to the sealed heat dissipation glue 7 through the heat dissipation holes 51 in the heat dissipation layer 5. The heat dissipation layer 5 is a film layer for heat dissipation surrounding the sides of the fluorescent light-emitting layer 4. A plurality of heat dissipation holes 51 are also evenly distributed around the heat dissipation layer 5, which is conducive to evenly dissipating heat through the heat dissipation holes 51, and each heat dissipation hole 51 has first silicone grease particles 52 on both sides. The first silicone grease particles 52 can absorb another part of the heat, and the first silicone grease particles 52 conduct the absorbed heat to the sealing heat dissipation glue 7. In the heat dissipation glue 7, the second silicone grease particles 73 mixed in the UV glue in the sealing heat dissipation glue 7 can absorb the conducted heat and dissipate it to the outside, and can dissipate the heat generated in the OLED display panel, thereby extending the service life of the OLED display panel. The barrier layer 8 is used when the OLED display panel is curled. The barrier layer 8 effectively blocks the diffusion of the first encapsulation layer 6, so that the first encapsulation layer plays a role in blocking water and oxygen on the periphery of the OLED device. The multiple discontinuous barrier units arranged in a chain form provide space for releasing the stress on the first encapsulation layer 6 in contact with the barrier layer 8, which is conducive to eliminating stress and preventing the first encapsulation layer 6 from falling off or being damaged due to the curling of the flexible OLED display panel.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flexible OLED display panel with a fluorescent light-emitting layer, characterized in that: include: Flexible substrate (1); A buffer layer (2), wherein the buffer layer (2) is prepared on the flexible substrate (1); a thin film transistor layer (3), wherein the thin film transistor layer (3) is prepared on the buffer layer (2); a fluorescent light-emitting layer (4), wherein the fluorescent light-emitting layer (4) is prepared on the thin film transistor layer (3); a heat dissipation layer (5), wherein the heat dissipation layer (6) is prepared on the side surfaces around the fluorescent light-emitting layer (4), wherein the heat dissipation layer (5) is provided with a plurality of heat dissipation holes (51) distributed evenly, and the two sides of each heat dissipation hole (51) are respectively and evenly filled with a plurality of first silicone grease particles (52) in equal amounts; a first encapsulation layer (6), wherein the first encapsulation layer (6) is prepared on the fluorescent light-emitting layer (4), and the first encapsulation layer (6) covers the surfaces of the fluorescent light-emitting layer (4) and the heat dissipation layer (5); a sealing heat dissipation glue (7), wherein the sealing heat dissipation glue (7) is arranged on the four sides of the OLED display panel. The sealing heat dissipation adhesive (7) comprises UV adhesive and second silicone grease particles (73) uniformly distributed in the UV adhesive; a barrier layer (8), the barrier layer (8) is prepared on the side of the first encapsulation layer (6), the barrier layer (8) comprises a plurality of discontinuous barrier units, and the plurality of barrier units are arranged in a chain; a second encapsulation layer (9), the second encapsulation layer (9) is prepared on the barrier layer (8), and the second encapsulation layer (9) covers the surface of the first encapsulation layer (6) and the barrier layer (8); the sealing heat dissipation adhesive (7) comprises a first sealing heat dissipation adhesive layer (71) and a second sealing heat dissipation adhesive layer (72) distributed from a side close to the OLED display panel to the outside, the number of the second silicone grease particles (73) in the first sealing heat dissipation adhesive layer (71) is less than the number of the second silicone grease particles (73) in the second sealing heat dissipation adhesive layer (72).

2. The flexible OLED display panel with a fluorescent light-emitting layer according to claim 1, wherein: The sealing heat dissipation adhesive (7) covers the side surfaces of the flexible substrate (1), the buffer layer (2), the thin film transistor layer (3) and the fluorescent light-emitting layer (4).

3. The flexible OLED display panel with a fluorescent light-emitting layer according to claim 1, wherein: The flexible substrate (1) comprises a first polyimide layer (11) and a second polyimide layer (12) arranged in sequence, wherein the upper surface of the first polyimide layer (11) has a plurality of first convex top surfaces (111) arranged uniformly and equidistantly, and the lower surface of the second polyimide layer (12) forms a concave-convex matching structure with the first convex top surfaces (111) on the first polyimide layer (11).

4. The flexible OLED display panel with a fluorescent light-emitting layer according to claim 1, wherein: The buffer layer (2) comprises a first buffer layer (21) and a second buffer layer (22) which are arranged in sequence, wherein the upper surface of the first buffer layer (21) has a plurality of second convex top surfaces (211) which are arranged evenly and equidistantly, and the lower surface of the second buffer layer (22) has a plurality of third convex top surfaces (221) which are arranged evenly and equidistantly and staggered with the second convex top surfaces (211) on the first buffer layer (21), the second convex top surfaces (211) on the first buffer layer (21) and the lower surface of the second buffer layer (22) form a concave-convex matching structure, and the third convex top surface (221) on the second buffer layer (22) and the upper surface of the first buffer layer (21) form a concave-convex matching structure.

5. The flexible OLED display panel with a fluorescent light-emitting layer according to claim 1, wherein: The first silicone grease particles (52) and the second silicone grease particles (73) are the same heat-absorbing particles.

6. The flexible OLED display panel with a fluorescent light-emitting layer according to claim 1, wherein: The barrier layer (8) comprises a plurality of first barrier units (81) and a plurality of second barrier units (82), wherein the first barrier units (81) and the second barrier units (82) are both C-shaped, and adjacent first barrier units (81) and second barrier units (82) are connected end to end.

7. The flexible OLED display panel with a fluorescent light-emitting layer according to claim 1, wherein: One end of the sealing heat dissipation adhesive (7) extends at least to the lower surface of the flexible substrate (1), and the other end of the sealing heat dissipation adhesive (7) extends at least to the side surface of the first packaging layer (6).

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