CN114864846A

CN114864846A - OLED light-emitting device and terminal equipment

Info

Publication number: CN114864846A
Application number: CN202210541149.5A
Authority: CN
Inventors: 许峰
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2022-05-17
Filing date: 2022-05-17
Publication date: 2022-08-05
Anticipated expiration: 2042-05-17
Also published as: CN114864846B

Abstract

The application provides an OLED luminescent device and terminal equipment, OLED luminescent device includes: the display substrate comprises a plurality of light-emitting laminated layers and packaging layers arranged on the light-emitting laminated layers; the light emitting laminated layer comprises a plurality of light emitting devices arranged in an array; the metal layer is formed on the surface of the packaging layer far away from the light-emitting unit; a color filter layer formed on the metal layer and including multiple color blocks; one of the color resist blocks is opposite to one of the light emitting units; and a black matrix layer formed on the metal layer; the black matrix layer comprises a plurality of openings, and one color block is accommodated in one opening. The OLED light-emitting device and the terminal equipment can improve the color separation phenomenon.

Description

OLED light-emitting device and terminal equipment

Technical Field

The application relates to the technical field of non-polaroids, in particular to an OLED light-emitting device and terminal equipment.

Background

OLED flexible devices are considered as a new generation of display technology, by which modules with a fixed curvature, even with repeated foldability, can be prepared. The OLED flexible device can be matched with a circular polarizer to be used, so that the overall reflectivity is reduced, and the contrast is improved. However, the circular polarizer greatly reduces the transmittance of light, so that the overall light emitting efficiency of the device is greatly reduced. In the prior art, the overall light-emitting rate of an OLED device can be effectively improved through a non-polarizer technology (pol-less), and the power consumption of a screen is greatly reduced.

A typical pol-less technology is implemented by combining Color Filters (CF) and a Black Matrix (BM), that is, above a thin film encapsulation layer, CF of the same color is used at a position corresponding to a pixel (usually, three colors of R, G, and B), and BM shielding is performed at a position without a pixel, so that the reduction of the reflectivity under the condition of no polarizer is realized. Without a polarizer, the reflected light formed when ambient light is incident on the cathode or anode cannot be blocked, resulting in significant pinhole diffraction and interference effects, resulting in significant diffraction and interference patterns, i.e., color separation fringes (color separation phenomenon), that can be seen from the front. And the color separation phenomenon affects the display effect of the OLED product.

Disclosure of Invention

In view of the above, the present application provides an OLED light emitting device and a terminal device capable of improving a color separation phenomenon.

In order to solve the above problems, the technical solution provided by the present application is as follows:

in a first aspect, the present application provides an OLED light emitting device comprising:

the display substrate comprises a light-emitting lamination and an encapsulation layer arranged on the light-emitting lamination; the light emitting laminated layer comprises a plurality of light emitting devices arranged in an array;

the metal layer is formed on the surface of the packaging layer far away from the light-emitting unit;

a color filter layer formed on the metal layer and including multiple color blocks; one of the color resist blocks is opposite to one of the light emitting units; and

a black matrix layer formed on the metal layer; the black matrix layer comprises a plurality of openings, and one color block is accommodated in one opening.

In an optional embodiment of the present application, the encapsulation layer includes a first inorganic film layer, an organic film layer, and a second inorganic film layer stacked together, the first inorganic film layer is formed on the light emitting stack, and the metal layer is formed on the second inorganic film layer.

In an alternative embodiment of the present application, the metal layer is a continuous film layer and does not absorb light.

In an optional embodiment of the present application, the material of the metal layer is silver-white metal or alloy.

In an alternative embodiment of the present application, the surface roughness of the metal layer is less than 10 nm.

In an optional embodiment of the present application, the transmittance of the metal layer is greater than or equal to 5% and less than or equal to 95%.

In an optional embodiment of the present application, the OLED light emitting device further includes a third inorganic film layer formed on the metal layer, and the black matrix layer and the color filter layer are both formed on the third inorganic film layer.

In an alternative embodiment of the present application, the thickness of the third inorganic film layer is less than the thickness of the second inorganic film layer and the first inorganic film layer.

In an alternative embodiment of the present application, the thickness of the third inorganic film layer is greater than 0.2 μm and less than 10 μm.

In a second aspect, the present application provides a terminal device comprising a main body and an OLED light emitting device as described above, the OLED light emitting device being formed on the main body.

The application provides an OLED luminescent device and terminal equipment, through form a metal level on the packaging layer and with black matrix layer and colored filter layer formation on the metal level, because the plane of reflection of metal level can be regarded as new light source, thereby the distance between the opening on light source (the plane of reflection of metal level) and the black matrix layer in the OLED luminescent device of this application reduces, and according to the general principle of optics, the light source is closer to the distance of aperture, and aperture diffraction effect is more unobvious to know: the reflected light reflected by the metal layer does not have obvious pinhole diffraction phenomenon, and the color separation degree of the OLED light-emitting device is reduced, so that the color separation phenomenon can be improved by the OLED light-emitting device and the terminal equipment provided by the application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, 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 cross-sectional view of a display panel according to a first embodiment of the present application.

Fig. 2 is a cross-sectional view of another display panel provided in a second embodiment of the present application.

Detailed Description

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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically defined otherwise.

The present application may repeat reference numerals and/or letters in the various implementations, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various implementations and/or configurations discussed.

The OLED light emitting device and the terminal device provided in the present application will be described in detail below with reference to specific embodiments and accompanying drawings.

Referring to fig. 1, a first embodiment of the present application provides an OLED light emitting device 100, where the OLED light emitting device 100 includes a display substrate 101, a metal layer 16, a black matrix layer 18, and a color filter layer 19. The metal layer 16 is formed on the display substrate 101, and the black matrix layer 18 and the color filter layer 19 are formed on the metal layer 16.

The display substrate 101 includes a driving substrate 11, a light emitting stack 12 formed on the driving substrate 11, and an encapsulation layer 10 disposed on the light emitting stack 12, where the light emitting stack 12 includes a plurality of light emitting units 121 arranged in an array, and one light emitting unit 121 corresponds to one light emitting pixel.

In the present embodiment, the light emitting units 121 are R, G, B at least two kinds of light emitting devices. Of course, in other embodiments, the kind of the light emitting unit 121 is not limited to at least two of the RGB light emitting devices, and may be other light emitting combinations.

In this embodiment, the light emitting stack 12 further includes an anode, a light emitting layer, a cathode, and the like, wherein the light emitting layer is located between the anode and the cathode. Specifically, the anode is formed on the driving substrate 11, and the driving substrate 11 is used for driving the light emitting layers to emit lights with different or the same color.

The encapsulation layer 10 includes a first inorganic film layer 13, an organic film layer 14, and a second inorganic film layer 15 stacked together, wherein the first inorganic film layer 13 is formed on the light emitting stack 12, and the metal layer 16 is formed on the second inorganic film layer 15.

In an optional embodiment of the present application, the metal layer 16 is a continuous dense film layer, so that the ambient light can only be reflected on the metal layer 16, and cannot be reflected on the reflective surfaces of the anode and the cathode, thereby avoiding an obvious pinhole diffraction phenomenon caused by the reflection of the ambient light on the reflective surfaces of the anode and the cathode, and further reducing the degree of color separation, thereby further improving the color separation phenomenon.

In an alternative embodiment of the present application, the material of the metal layer 16 is silver white metal or alloy. Preferably, the material of the metal layer 16 may be silver white metal such as silver (Ag), chromium (Cd), aluminum (Al), zinc (Zn), or silver white alloy. Silvery white metal has a relatively high reflectance and a relatively small color cast of reflected light.

In an optional embodiment of the present application, the surface roughness of the metal layer 16 is less than 10nm, and the flatness of the metal layer 16 is high, which is beneficial to the preparation of the black matrix layer 18 and the color filter layer 19.

In an alternative embodiment of the present application, the transmittance of the metal layer 16 is greater than or equal to 5% and less than or equal to 95%. Preferably, the transmittance of the metal layer 16 is greater than or equal to 50% and less than or equal to 90%. More preferably, the transmittance of the metal layer 16 is greater than or equal to 65% and less than or equal to 85%. The transmittance of the metal layer 16 is set as above, which is beneficial to reducing diffraction phenomena and can reduce the deterioration of luminescent materials caused by the irradiation of ambient light on the luminescent layer.

Wherein, the black matrix layer 18 includes a plurality of openings 181, and one of the light emitting units 121 is opposite to one of the openings 181.

Wherein the color filter layer 19 is formed on the metal layer 16 and includes a plurality of color resist blocks 191; one of the color blocks 191 is located opposite one of the openings 181.

The OLED light-emitting device 100 further includes a planarization layer 20 and a protection layer 21, the planarization layer 20 is formed on the black matrix layer 18 and the color filter layer 19, and the protection layer 21 is formed on the planarization layer 20. The materials of the flat layer 20 and the protection layer 21 are the materials of the flat layer and the protection layer commonly used in the OLED device, and are not described herein.

In another optional embodiment of the present application, the OLED light emitting device 100 further includes a touch layer (not shown), and the touch layer may be disposed in the OLED light emitting device 100 (the specific position may be determined according to the actual situation), or may be disposed outside the OLED light emitting device 100 in a plug-in manner.

Wherein, because the reflecting surface of the metal layer can be regarded as a new light source, so that the distance between the light source (the reflecting surface of the metal layer) and the opening on the black matrix layer in the OLED light-emitting device of the present application is reduced, according to the general principle of optics, the closer the light source is to the aperture, the less obvious the diffraction effect of the aperture is: the reflected light reflected by the metal layer in the OLED light-emitting device does not have the phenomenon of obvious small hole diffraction, and the degree corresponding to color separation is reduced, so that the OLED light-emitting device provided by the application can improve the phenomenon of color separation.

In addition, since the intensity of light irradiated to the area other than the black matrix layer 18 is constant and all incident light is reflected after passing through the color filter layer 19 (regardless of the reflection at the color filter layer 19/planarization layer 20 interface), adding a metal layer does not increase the reflectance of the device as a whole.

Furthermore, since the metal layer 16 itself is not light absorbing, the light emitted from the light emitting stack 12 will eventually pass through the metal layer 16 completely, but may need to pass through multiple reflection paths, and the total effect of the metal layer 16 will not reduce the light output of the OLED light emitting device.

Referring to fig. 2, the present application further provides an OLED light emitting device 200, where the structure of the OLED light emitting device 200 is similar to that of the OLED light emitting device 100, and the difference is that: the OLED light emitting device 200 further includes a third inorganic film 17, the third inorganic film 17 is formed on the metal layer 16, and the black matrix layer 18 and the color filter layer 19 are formed on the third inorganic film 17.

The third inorganic film 17 may not only increase the film bonding force between the metal layer 16 and the black matrix layer 18 and the color filter layer 19, but also reduce the roughness of the metal layer 16 to make the metal layer 16 more flat, since the third inorganic film 17 is not easily separated from the black matrix layer 18 and the color filter layer 19.

In an alternative embodiment of the present application, the thickness of the third inorganic film layer 17 is smaller than the thickness of the second inorganic film layer 15 and the first inorganic film layer 13.

In an alternative embodiment of the present application, the thickness h of the third inorganic film layer 17 satisfies: 0.2um < h <10 um. Preferably, 0.2um < h <5 um.

If the third inorganic film layer 17 is too thin, the roughness of the metal layer 16 cannot be reduced to a proper range, and if the third inorganic film layer 17 is too thick, the distance between the reflective surface of the metal layer 16 and the opening 181 of the black matrix layer 18 becomes large, the reflected light reflected by the metal layer 16 has a phenomenon of significant pinhole diffraction, and the degree of color separation of the OLED light-emitting device becomes large, which is not favorable for improving the color separation phenomenon.

The present application also provides a terminal device (not shown) including a main body (not shown) on which the OLED

light emitting device

100 or 200 is formed, and the OLED

light emitting device

100 or 200 as described above. The terminal device can be a mobile phone, a computer and the like.

The application provides an OLED luminescent device and terminal equipment, through form a metal level on the packaging layer and with black matrix layer and colored filter layer formation on the metal level, because the plane of reflection of metal level can be regarded as new light source, thereby the distance between the opening on light source (the plane of reflection of metal level) and the black matrix layer in the OLED luminescent device of this application reduces, and according to the general principle of optics, the light source is closer to the distance of aperture, and aperture diffraction effect is more unobvious to know: the reflected light reflected by the metal layer does not have the obvious phenomenon of small hole diffraction, and the color separation degree of the OLED light-emitting device is reduced, so that the OLED light-emitting device and the terminal equipment provided by the application can improve the color separation phenomenon.

In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.

Claims

1. An OLED light emitting device, comprising:

the display substrate comprises a plurality of light-emitting laminated layers and packaging layers arranged on the light-emitting laminated layers; the light-emitting laminated layer comprises a plurality of light-emitting units arranged in an array;

2. The OLED light emitting device of claim 1, wherein the encapsulation layer includes a first inorganic film layer, an organic film layer, and a second inorganic film layer stacked together, the first inorganic film layer being formed on the light emitting stack, the metal layer being formed on the second inorganic film layer.

3. The OLED light emitting device of claim 1, wherein the metal layer is a continuous film layer and is non-light absorbing.

4. The OLED light emitting device of claim 1, wherein the metal layer is made of a silver-white metal or alloy.

5. The OLED light emitting device of claim 1 wherein the surface roughness of the metal layer is less than 10 nm.

6. The OLED light emitting device of claim 1, wherein the metal layer has a transmittance of greater than or equal to 5% and less than or equal to 95%.

7. The OLED light emitting device of any one of claims 2-6, further comprising a third inorganic film layer formed on the metal layer, wherein the black matrix layer and the color filter layer are formed on the third inorganic film layer.

8. The OLED light emitting device of claim 7, wherein the third inorganic film layer has a thickness less than a thickness of the second inorganic film layer and the first inorganic film layer.

9. The OLED light emitting device of claim 8, wherein the third inorganic film layer has a thickness greater than 0.2 μ ι η and less than 10 μ ι η.

10. A terminal device comprising a body and an OLED light emitting device according to any one of claims 1-9, the OLED light emitting device being formed on the body.