CN110620188A

CN110620188A - Display panel and display device

Info

Publication number: CN110620188A
Application number: CN201910783551.2A
Authority: CN
Inventors: 王丽君
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2019-12-27

Abstract

The invention discloses a display panel and a display device, wherein the display panel comprises an OLED light-emitting device; the optical adhesive layer is arranged on the OLED light-emitting device; and the surface anti-reflection layer is arranged on one side of the optical adhesive layer, which is far away from the OLED light-emitting device, and the refractive index of the optical adhesive layer is between that of the OLED light-emitting device and that of the surface anti-reflection layer. The display panel and the display device have the advantages that the surface of the surface anti-reflection layer is subjected to surface roughening treatment, so that light is softer, the display quality of the display panel is improved, meanwhile, the refractive indexes of the OLED light-emitting device, the optical adhesive layer and the surface anti-reflection layer in the display panel are sequentially increased or decreased, the problem that the light cannot be emitted from the front due to a coupling effect is avoided, the visible brightness is improved, the light-emitting efficiency of the display panel is improved on the basis of considering flexible application, and the light-emitting efficiency can be improved by 30% at most on the basis of the prior art.

Description

Display panel and display device

Technical Field

The present invention relates to the field of light emission, and in particular, to a display panel and a display device.

Background

The background section is only provided to assist in understanding the present disclosure, and thus the disclosure in the background section may include some prior art that does not constitute a part of the knowledge of one skilled in the art, and the disclosure in the background section does not represent that matter or the problem to be solved by one or more embodiments of the present invention, nor is it intended to be known or appreciated by one skilled in the art prior to the present application.

Organic Light-Emitting diodes (OLEDs) are increasingly used as a current-type Light-Emitting device in high-performance displays, and due to their self-Light-Emitting characteristics, OLEDs have many advantages such as high contrast, ultra-Light and thinness, flexibility, fast response speed, bright color, and high contrast, compared to thin film transistor displays. The driving circuit of the OLED may be classified into a passive driving (PMOLED) and an active driving (AMOLED) according to a driving method. With the increase of the panel and the increase of the display density of the passive driving, larger current must be applied to each driving pixel circuit in time, the service life of the luminescent material is greatly consumed, and the instantaneous high voltage of the passive driving causes the power consumption of the circuit to be large and the power to be low. The Active Matrix Organic Light Emitting Diode (AMOLED) can overcome the defects of the passive driving display and realize high-resolution, large-size and low-power-consumption display.

The AMOLED panel adopts a self-luminous technology, but due to the influence of a coupling effect, the emitted light cannot be emitted from the front surface completely, the visible brightness is changed, and the loss is large. In OLED devices, the generated light is typically lost by more than 70% due to processes within the device structure.

The current state of the art includes sand blasting the surface of the cover plate of the glass device, using multilayer step film technology, and applying OLED light extraction films laminated to the substrate. These methods have the disadvantages of high manufacturing cost, complicated process, and unsuitability for OLED process of flexible substrate.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a display panel and a display device, so as to solve the technical problem that light cannot be emitted from the front side due to the influence of the coupling effect in the prior art.

The technical scheme for solving the technical problems is as follows: the invention provides a display panel, comprising an OLED light-emitting device; the optical adhesive layer is arranged on the OLED light-emitting device; and the surface anti-reflection layer is arranged on one side of the optical adhesive layer, which is far away from the OLED light-emitting device, and the refractive index of the optical adhesive layer is between that of the OLED light-emitting device and that of the surface anti-reflection layer.

Further, the OLEDThe refractive index of the light-emitting device is n1, the refractive index of the optical adhesive layer is n2, and the refractive index of the surface antireflection layer is n3, wherein the refractive index of the surface antireflection layer is n1

Furthermore, an anti-reflection structure is arranged on the surface anti-reflection layer, wherein the anti-reflection structure is at least one of a four-sided cone shape, a prism shape, a cone shape or a three-sided cone shape.

Furthermore, the material of the surface antireflection layer is a calcium fluoride material.

Furthermore, the refractive index of the OLED light-emitting device is larger than that of the surface antireflection layer.

Further, the refractive index of the surface antireflection layer is larger than that of the OLED light-emitting device.

Furthermore, the refractive index of the OLED light-emitting device, the refractive index of the surface antireflection layer and the refractive index of the optical adhesive layer are the same.

Furthermore, the refractive index of the OLED light-emitting device is n1, the refractive index of the optical adhesive layer is n2, and the refractive index of the surface antireflection layer is n3 which is 0.1-1.6.

Further, the display panel is a flexible display panel.

The invention also provides a display device comprising the display panel.

The invention has the advantages that: according to the display panel and the display device, the surface of the surface anti-reflection layer is subjected to surface roughening treatment, so that light is softer, the display quality of the display panel is improved, meanwhile, the refractive indexes of the OLED light-emitting device, the optical adhesive layer and the surface anti-reflection layer in the display panel are sequentially increased or decreased, the problem that the light cannot be emitted from the front face completely due to a coupling effect is avoided, the visible brightness is improved, the light-emitting efficiency of the display panel is improved on the basis of considering flexible application, and the maximum light-emitting efficiency can be improved by 30% on the basis of the prior art.

Drawings

The invention is further explained below with reference to the figures and examples.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of a display panel in embodiment 1.

Fig. 2 is a plan view of the display panel in embodiment 1.

Fig. 3 is a schematic view of a display device in embodiment 1.

In the drawings

1 a display device; 10 a display panel;

a 110OLED light emitting device; 120 optical glue layer;

130 a surface anti-reflection layer; 131 an anti-reflection structure;

Detailed Description

The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.

Example 1

As shown in fig. 1, in this embodiment, the display panel 10 of the invention includes an OLED light emitting device 110, an optical adhesive layer 120, and a surface anti-reflection layer 130.

The OLED light emitting device 110 is an OLED light emitting device, and belongs to a current type organic light emitting device, and is a phenomenon of emitting light by injecting and combining carriers, and the light emitting intensity is in direct proportion to the injected current. Under the action of an electric field, holes generated by an anode and electrons generated by a cathode move, are respectively injected into a hole transport layer and an electron transport layer, and migrate to a light emitting layer. When the two meet at the light emitting layer, energy excitons are generated, so as to excite the light emitting molecules to finally generate visible light. This structure has an advantage of allowing excitons to be confined in the light-emitting layer, thereby improving the efficiency of the device.

The optical adhesive layer 120 is disposed on the OLED light emitting device 110, the optical adhesive layer 120 is a colorless transparent colloid, the light transmittance of the colloid is above 90%, the material of the colloid is at least one of organic silica gel, acrylic resin, unsaturated polyester, polyurethane, and epoxy resin, and the colloid has a high molecular weight and excellent adhesive property. It can glue two or more optical parts into an optical component which can meet the design requirement of an optical path.

The surface anti-reflection layer 130 is disposed on a side of the optical adhesive layer 120 away from the OLED light emitting device 119, that is, the optical adhesive layer 120 connects the OLED light emitting device 110 and the surface anti-reflection layer 130, wherein the OLED light emitting device 110 has a refractive index n1, the optical adhesive layer 120 has a refractive index n2, and the surface anti-reflection layer 130 has a refractive index n3, so that light loss is reduced to the maximum extent after passing through the OLED light emitting device 110, the optical adhesive layer 120 and the surface anti-reflection layer 130, in this embodiment, the refractive index n1 of the OLED light emitting device 110 is greater than the refractive index n3 of the surface anti-reflection layer 130, and the refractive index n2 of the optical adhesive layer 120 satisfies that the refractive index n2In a preferred embodiment of the invention, the refractive index n1 of the OLED light emitting device 110 is less than the refractive index n3 of the surface anti-reflection layer 130, and the refractive index n2 of the optical adhesive layer 120 satisfies the requirement

An anti-reflection structure 131 is further disposed on a side of the surface anti-reflection layer 130 away from the optical adhesive layer 120, where the anti-reflection structure 131 is configured to increase the surface roughness of the surface anti-reflection layer 130, so that after light is emitted from the surface anti-reflection layer 130, light is scattered through the anti-reflection structure 131, the softness is increased, and the display quality of the display panel 10 is improved, where the anti-reflection structure 131 is a four-sided cone, a prism, a cone, a three-sided cone, or another shape capable of increasing the surface roughness of the surface anti-reflection layer 130, as shown in fig. 2, in this embodiment, the anti-reflection structure 131 is a four-sided cone structure, and the roughness of the surface anti-reflection layer 130 after being subjected to surface roughening treatment is half of the wavelength value of the light emitted from the surface anti-reflection layer 130, so as to facilitate light scattering.

As shown in fig. 3, the display device 1 in this embodiment includes a display panel 10, wherein the main technical features and the main technical effects of the display device 1 are collectively embodied on the display panel 10, and further details of other components of the display device 1 are omitted.

Example 2

The structure of the display panel 10 in this embodiment is substantially similar to that of the display panel 10 in embodiment 1, and the difference is that in this embodiment, the refractive index n1 of the OLED light emitting device 110, the refractive index n2 of the optical adhesive layer 120, and the refractive index n3 of the surface antireflection layer 130 are the same, and at this time, light is emitted through the OLED light emitting device 110, the optical adhesive layer 120, and the surface antireflection layer 130 under the condition that the refraction angle is not changed, so that the light emitting efficiency of the display panel 10 is increased, and under the same luminance, the OLED driving current is saved, and the cost is saved.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, comprising

An OLED light emitting device;

the optical adhesive layer is arranged on the OLED light-emitting device;

and the surface anti-reflection layer is arranged on one side of the optical adhesive layer, which is far away from the OLED light-emitting device, and the refractive index of the optical adhesive layer is between that of the OLED light-emitting device and that of the surface anti-reflection layer.

2. The display panel according to claim 1,

the refractive index of the OLED light-emitting device is n1, the refractive index of the optical adhesive layer is n2, and the refractive index of the surface antireflection layer is n3, wherein the refractive index of the OLED light-emitting device is n1

3. The display panel according to claim 1,

an anti-reflection structure is arranged on the surface anti-reflection layer, wherein the anti-reflection structure is at least one of a four-sided cone shape, a prism shape, a cone shape or a three-sided cone shape.

4. The display panel according to claim 1,

the material of the surface antireflection layer is a calcium fluoride material.

5. The display panel according to claim 1,

the refractive index of the OLED light-emitting device is larger than that of the surface antireflection layer.

6. The display panel according to claim 1,

the refractive index of the surface antireflection layer is larger than that of the OLED light-emitting device.

7. The display panel according to claim 1,

the refractive index of the OLED light-emitting device, the refractive index of the surface antireflection layer and the refractive index of the optical adhesive layer are the same.

8. The display panel according to claim 2,

the refractive index of the OLED light-emitting device is n1, the refractive index of the optical adhesive layer is n2, and the refractive index of the surface antireflection layer is n3 which is 0.1-1.6.

9. The display panel according to claim 1,

the display panel is a flexible display panel.

10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.