CN111430568B - Display substrate, preparation method thereof and display device - Google Patents

Display substrate, preparation method thereof and display device Download PDF

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Publication number
CN111430568B
CN111430568B CN202010244736.9A CN202010244736A CN111430568B CN 111430568 B CN111430568 B CN 111430568B CN 202010244736 A CN202010244736 A CN 202010244736A CN 111430568 B CN111430568 B CN 111430568B
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light
emitting unit
layer
light emitting
film layer
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CN111430568A (en
Inventor
但艺
吴海龙
付剑波
朱海鹏
冉敏
周焱
韩燕淋
梁鹏
周欢
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BOE Technology Group Co Ltd
Chongqing BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chongqing BOE Optoelectronics Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/854—Arrangements for extracting light from the devices comprising scattering means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/856—Arrangements for extracting light from the devices comprising reflective means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The embodiment of the invention provides a display substrate, a preparation method thereof and a display device, wherein the display substrate comprises a light-emitting unit and a narrowing film layer arranged on the light-emitting side of the light-emitting unit, and the narrowing film layer is used for scattering light rays emitted by the light-emitting unit so as to reduce the spectral line width of the light rays emitted by the light-emitting unit; the color gamut of the display device is improved, so that the display effect is better, richer and vivid, and is close to the real effect.

Description

Display substrate, preparation method thereof and display device
Technical Field
The invention relates to the technical field of display, in particular to a display substrate, a preparation method thereof and a display device.
Background
An Organic Light Emitting Diode (OLED) display device is a development trend of future display products, and has a series of advantages of wide viewing angle, fast response speed, high brightness, high contrast, bright color, light weight, thin thickness, low power consumption, and the like. Currently, organic light emitting diode display devices have begun to be applied to mobile phone screens.
The wide color gamut of the OLED screen is popular with consumers, but the color gamut of the OLED screen is not pure in red light and blue light, so the OLED screen is still not as good as a micro organic light emitting diode display (micro led) or the like in color gamut performance. The color gamut of a Liquid Crystal Display (LCD) depends on the backlight, and if a wider-gamut backlight is used, the color gamut performance level is comparable to that of an OLED. The color gamut expanded LCD does not output OLEDs at all in terms of color, and particularly the LCD + quantum dot backlight color gamut expansion completely covers the OLEDs in performance.
The narrower the red, green and blue spectral linewidth of the display, the purer the color obtained, the richer and truer the color that the display can show, the traditional method for improving the color gamut is to select a luminescent material capable of radiating photons of the corresponding frequency of transition, which has a very serious dependence on the material, and the traditional method (filter) for shrinking the spectral linewidth obtains light of usually a single frequency.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a display substrate, a manufacturing method thereof, and a display device, so as to improve a color gamut of the display device, and make a display effect more rich and vivid and close to a realistic effect.
In order to solve the above technical problem, an embodiment of the present invention provides a display substrate, including a light emitting unit and a narrowing film layer disposed on a light emitting side of the light emitting unit, where the narrowing film layer scatters light emitted by the light emitting unit to reduce a spectral line width of the light emitted by the light emitting unit.
Optionally, the narrowing film layer is of an annular structure, a through hole is formed in the middle of the narrowing film layer, a scattering surface is arranged on the inner wall of the through hole, and the light emitted by the light emitting unit is scattered by the scattering surface, so that the light emitted by the light emitting unit is circularly transmitted in the narrowing film layer along the circumferential direction, and the spectral line width of the light emitted by the light emitting unit is reduced.
Optionally, the scattering surface is zigzag, and light emitted by the light emitting unit is totally reflected at the scattering surface.
Optionally, the backlight module further comprises a reflecting medium layer, the reflecting medium layer is of a prismatic structure, the reflecting medium layer and the narrowing film layer are arranged on the same layer, and the reflecting medium layer is used for refracting light rays emitted by the light emitting unit into the narrowing film layer.
Optionally, the thin film transistor substrate further comprises a passivation layer, wherein the passivation layer and the narrowing film layer are arranged in the same layer and are prepared through the same preparation process.
Optionally, the light emitting device further comprises a reflective substrate, the light emitting unit and the narrowing film layer are disposed on the reflective substrate, and the narrowing film layer is disposed between the reflective substrate and the light emitting unit.
Optionally, the display device further includes a light emitting driving circuit, the light emitting driving circuit is connected to the light emitting unit, and is configured to control and drive the light emitting unit, the light emitting driving circuit includes:
an active layer;
a first insulating layer covering the active layer and a gate electrode disposed on the first insulating layer;
the second insulating layer covers the gate electrode, and the source and drain electrodes are arranged on the second insulating layer and are connected with the doped region in the active layer through the through holes;
a third insulating layer covering the source and drain electrodes;
a common electrode formed on the third insulating layer;
and forming a passivation layer covering the common electrode and a connection electrode disposed on the passivation layer, the connection electrode connecting the common electrode with the light emitting unit.
Optionally, the light emitting unit comprises a first electrode, a second electrode and a light emitting layer arranged between the first electrode and the second electrode, wherein the first electrode and the second electrode are oppositely arranged;
the light emitting unit further includes a hole transport layer disposed between the first electrode and the light emitting layer; and/or an electron transport layer disposed between the second electrode and the light emitting layer.
The embodiment of the invention also provides a display device which comprises the display substrate.
The embodiment of the invention also provides a preparation method of the display substrate, which comprises the following steps:
a light-emitting unit and a narrowing film layer are formed on a substrate, and the narrowing film layer is located on the light-emitting side of the light-emitting unit.
The invention provides a display substrate, a preparation method thereof and a display device, wherein light rays emitted by a light-emitting unit are scattered in a medium of a narrowing film layer through the narrowing film layer, the spectral line width of the light rays emitted by the light-emitting unit is reduced in the scattering process, and the narrowing film layer forms a Rayleigh narrowing model in the field of optical waveguide, so that the color gamut of the light rays emitted by the light-emitting unit is improved, the display effect is better, rich and vivid, and is close to the practical effect.
The narrowing film layer in the display substrate is of an annular structure, light emitted by the light-emitting unit is scattered at the scattering surface, so that the light emitted by the light-emitting unit circularly propagates in the annular structure of the narrowing film layer along the circumferential direction, and the narrowing effect is more obvious as the light scattering optical path is longer, so that the narrowing film layer increases the light scattering optical path of the light emitted by the light-emitting unit, and the color gamut of the light emitted by the light-emitting unit is further improved.
The narrowing film layer in the display substrate can simultaneously narrow light rays with three line widths, namely red light, blue light and green light, so that the requirement of improving the color gamut of the display is met.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention. The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
FIG. 1 is a cross-sectional view of a first embodiment of a display substrate according to the present invention;
FIG. 2 is a top view of a cross-section of a first embodiment of a display substrate according to the present invention;
FIG. 3 is a schematic view of a first embodiment of a display substrate according to the present invention;
FIG. 4 is a circuit diagram of a display substrate according to a first embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the invention provides a display substrate, which comprises a light-emitting unit and a narrowing film layer arranged on the light-emitting side of the light-emitting unit, wherein the narrowing film layer comprises a narrowing film layer, and the narrowing film layer scatters light emitted by the light-emitting unit so as to reduce the spectral line width of the light emitted by the light-emitting unit. The display substrate reduces the spectral line width of the light emitted by the light emitting unit by pressing the narrowing film layer so as to improve the color gamut of the light emitted by the light emitting unit.
First embodiment
FIG. 1 is a cross-sectional view of a display substrate according to an embodiment of the invention; FIG. 2 is a top view of a cross-section of a display substrate according to an embodiment of the invention. As shown in fig. 1 and fig. 2, an embodiment of the invention provides a display substrate, which includes a light emitting unit 10 and a narrowing film layer 20 disposed on a light exit side of the light emitting unit 10, wherein the narrowing film layer 20 scatters light emitted from the light emitting unit 10 to reduce a spectral line width of the light emitted from the light emitting unit 10.
In the embodiment of the invention, the light emitted by the light-emitting unit 10 is scattered in the medium of the narrowing film layer 20 by narrowing the film layer 20, and the spectral line width of the light emitted by the light-emitting unit 10 is reduced in the scattering process, so that the narrowing film layer 20 forms the rayleigh narrowing model in the field of optical waveguide, and further the color gamut of the light emitted by the light-emitting unit 10 is improved, and the display effect is better, richer and vivid and is close to the practical effect.
The principle of laminating narrow light rays by the narrowing film in the embodiment of the invention is as follows:
any substance is not completely homogeneous, and macroscopically we believe that a homogeneous substance can be viewed microscopically as a series of homogeneous particles dispersed in a homogeneous medium, on the order of nanometers, and when photons strike a particle they undergo back-elastic scattering, known as rayleigh scattering. When the initial light is subjected to rayleigh scattering and then the backward scattering spectrum is narrowed compared with the original spectrum due to the extremely large rayleigh scattering (the central wavelength after the narrowing is the wave band with concentrated energy), the narrowed rayleigh scattering light serving as seed light circulates in the narrowing film layer 20 again, uneven particles are narrowed again after the narrowing, the circulation is repeated, the spectrum of the light emitted finally is extremely narrowed compared with the spectrum of the original light, the color gamut area coverage of the narrowed light is wider, and the color after color mixing is richer.
As shown in fig. 1 and 2, the narrowing film layer 20 has a ring-shaped structure, for example, a ring-shaped structure. The through hole 201 is arranged in the middle of the narrowing film layer 20, the scattering surface 202 is arranged on the inner wall of the through hole 201, and the light emitted by the light emitting unit 10 is scattered by the scattering surface 202, so that the light emitted by the light emitting unit 10 circularly propagates in the narrowing film layer 20 along the circumferential direction, that is, the light emitted by the light emitting unit 10 circularly propagates around the periphery of the through hole 201 and along the circumferential direction through scattering of the scattering surface 202. Since the longer the light path of light scattering is, the more obvious the narrowing effect is, the structure of the narrowing film layer 20 increases the light path of light emitted by the light emitting unit 10, and further improves the color gamut of light emitted by the light emitting unit 10.
As shown in fig. 2, the refractive index of the medium in the through hole 201 is lower than that of the medium in the narrowing film layer 20, for example, the medium in the through hole 201 is air, and the medium in the narrowing film layer is silicon nitride. Thereby, the light emitted from the light emitting unit 10 is totally reflected at the scattering surface 202, and most of the light emitted from the light emitting unit 10 circularly propagates around the through hole 201 in the narrowing film layer 20.
In the embodiment, the scattering surface may have various structures as long as the light can be scattered. For example, the scattering surface has an uneven film structure such as a sawtooth shape.
As shown in fig. 1, the display substrate of the embodiment further includes a reflective medium layer 40, and the reflective medium layer 40 and the narrowing film layer 20 are disposed on the same layer and can be prepared through the same preparation process. The reflective medium layer 40 corresponds to the light emitting unit 10 and is used for refracting light emitted from the light emitting unit 10 into the narrowing film layer 20.
In embodiments, the reflective medium layer may have various structures as long as it can refract light into the narrowing film layer. For example, the reflecting medium layer is in a prismatic structure.
In an embodiment, the display substrate further includes a passivation layer made of an insulating material for protecting the film layer. The passivation layer, the narrowing film layer and the reflecting medium layer can be prepared through the same preparation process. That is, in the process of manufacturing the display substrate, an insulating material film is first formed, and the passivation layer, the narrowing film layer and the reflective dielectric layer are respectively formed on the insulating material film through the same composition process, so that other film layers do not need to be deposited on the basis of the original film layer to form the narrowing film layer and the reflective dielectric layer. And the narrow film layer and the reflecting medium layer have the function of a passivation layer.
The embodiment display substrate further comprises a reflecting substrate, wherein the reflecting substrate is provided with a light emitting unit and a narrowing film layer, and the narrowing film layer is arranged between the reflecting substrate and the light emitting unit. The light emitted by the light-emitting unit is emitted to the reflecting substrate after passing through the narrowing film layer, and then is reflected by the reflecting substrate to form display light.
In some embodiments, the display substrate of the present invention may also adopt a top emission structure, that is, the light emitted from the light emitting unit passes through the narrowing film layer for spectrum narrowing and then is emitted to form the display light.
The technical solution of the present invention will be described in detail by the following specific examples.
Fig. 3 is a schematic structural diagram of a display substrate according to a first embodiment of the invention. As shown in fig. 3, the embodiment display substrate includes a light emitting driving circuit 30, and the light emitting driving circuit 30 is connected to the light emitting unit 10 for controlling and driving the light emitting unit 10. The light emitting driving circuit 30 includes an active layer 301 formed on a substrate, a first insulating layer 302 covering the active layer 301, a gate electrode 303 disposed on the first insulating layer 302, a second insulating layer 304 covering the gate electrode, and a source/drain electrode 305 disposed on the second insulating layer 304, wherein a first via hole communicating with a doped region in the active layer 301 is disposed in the second insulating layer 304, and the source/drain electrode 305 is connected to the doped region in the active layer 301 through the first via hole.
As shown in fig. 3, the light emission driving circuit further includes a third insulating layer 306 covering the source-drain electrodes 305, a common electrode 307 formed on the third insulating layer 306, and a passivation layer 308 formed to cover the common electrode 307, and a connection electrode 309 disposed on the passivation layer 308. A second via hole communicating with the source-drain electrode 305 is formed in the third insulating layer 306, and the common electrode 307 is connected with the source-drain electrode 305 through the second via hole. A third via hole communicated with the common electrode 307 is formed in the passivation layer 308, one end of the connection electrode 309 is connected to the common electrode 307 through the third via hole, and the other end of the connection electrode 309 is connected to the light emitting unit 10, so that the common electrode 307 and the light emitting unit 10 are electrically connected through the connection electrode 309.
As shown in fig. 3, the light emitting unit 10 includes a first electrode 101, a second electrode 102, and a light emitting layer 103 disposed between the first electrode 101 and the second electrode 102, which are oppositely disposed. Wherein the first electrode 101 is located on the reflective medium layer 40. The passivation layer 308, the narrowing film layer 20 and the reflective dielectric layer 40 are fabricated through the same fabrication process. Namely, the passivation layer 308, the narrowing film layer 20 and the reflective dielectric layer 40 are all formed of the same insulating material film by the same patterning process. The passivation layer 308, the narrowing film layer 20 and the reflective medium layer 40 are made of the same material, for example, the passivation layer 308, the narrowing film layer 20 and the reflective medium layer 40 are made of silicon nitride.
FIG. 4 is a circuit diagram of a display substrate according to a first embodiment of the present invention. As shown in fig. 3 and 4, when the light-emitting driving circuit 30 drives the light-emitting unit 10 to emit light, the light emitted from the light-emitting unit 10 forms an incident light entering the reflective medium layer 40, wherein a part of the incident light is refracted at the boundary between the reflective medium layer 40 and the first electrode 101 and then enters the narrowing film layer 20, and another part of the incident light is reflected by the prismatic structure of the reflective medium layer 40 and enters the narrowing film layer 20; the incident light entering the narrowing film layer 20 is scattered at the scattering surface of the narrowing film layer 20, so that the incident light circularly propagates in the narrowing film layer 20 in the circumferential direction, thereby narrowing the spectral line width of the incident light.
In an embodiment, the light emitting unit 10 further includes a hole transport layer disposed between the first electrode and the light emitting layer; and/or an electron transport layer disposed between the second electrode and the light emitting layer.
Second embodiment
Based on the technical concept of the foregoing embodiment, the present invention further provides a method for manufacturing a display substrate, including:
a light-emitting unit and a narrowing film layer are formed on a substrate, and the narrowing film layer is located on the light-emitting side of the light-emitting unit.
The preparation process can be realized by utilizing the existing mature preparation equipment, the improvement on the existing process is small, and the preparation process can be well compatible with the existing preparation process, so that the preparation process has the advantages of low manufacturing cost, easiness in process realization, high production efficiency, high yield and the like, and has a good application prospect.
Third embodiment
Based on the technical idea of the foregoing embodiment, the invention further provides a display device including the display substrate of the foregoing embodiment. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In the description of the embodiments of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A display substrate is characterized by comprising a light-emitting unit, a narrowing film layer and a reflecting medium layer, wherein the narrowing film layer is arranged on the light-emitting side of the light-emitting unit, and the narrowing film layer is used for scattering light rays emitted by the light-emitting unit so as to reduce the spectral line width of the light rays emitted by the light-emitting unit; the reflecting medium layer is used for refracting the light rays emitted by the light emitting unit into the narrowing film layer; the narrowing film layer is of an annular structure, a through hole is formed in the middle of the narrowing film layer, a scattering surface is arranged on the inner wall of the through hole and scatters light emitted by the light emitting unit, so that the light emitted by the light emitting unit circularly propagates in the narrowing film layer along the circumferential direction, and the spectral line width of the light emitted by the light emitting unit is reduced.
2. The display substrate of claim 1, wherein the scattering surface is saw-toothed, and light emitted from the light emitting unit is totally reflected at the scattering surface.
3. The display substrate of claim 1, wherein the reflective medium layer is a prismatic structure, and the reflective medium layer and the narrowing film layer are disposed on the same layer.
4. The display substrate of claim 1, further comprising a passivation layer, wherein the passivation layer and the narrowing film layer are disposed on the same layer and prepared by the same preparation process.
5. The display substrate according to claim 1, further comprising a reflective base on which the light emitting unit and the narrowing film layer are disposed, the narrowing film layer being disposed between the reflective base and the light emitting unit.
6. The display substrate according to claim 1, further comprising a light emission driving circuit connected to the light emitting unit for controlling and driving the light emitting unit, the light emission driving circuit comprising:
an active layer;
a first insulating layer covering the active layer and a gate electrode disposed on the first insulating layer;
the second insulating layer covers the gate electrode, and the source and drain electrodes are arranged on the second insulating layer and are connected with the doped region in the active layer through via holes;
a third insulating layer covering the source and drain electrodes;
a common electrode formed on the third insulating layer;
and forming a passivation layer covering the common electrode and a connection electrode disposed on the passivation layer, the connection electrode connecting the common electrode with the light emitting unit.
7. The display substrate according to claim 1, wherein the light-emitting unit comprises a first electrode, a second electrode, and a light-emitting layer disposed between the first electrode and the second electrode, which are disposed to face each other;
the light emitting unit further includes a hole transport layer disposed between the first electrode and the light emitting layer; and/or an electron transport layer disposed between the second electrode and the light emitting layer.
8. A display device comprising the display substrate according to any one of claims 1 to 7.
9. A method for preparing a display substrate is characterized by comprising the following steps:
forming a light emitting unit, a reflecting medium layer and a narrowing film layer on a substrate, and enabling the narrowing film layer and the reflecting medium layer to be positioned on the light emitting side of the light emitting unit;
the narrowing film layer scatters the light emitted by the light-emitting unit so as to reduce the spectral line width of the light emitted by the light-emitting unit; the reflecting medium layer is used for refracting the light rays emitted by the light emitting unit into the narrowing film layer;
the narrowing film layer is of an annular structure, a through hole is formed in the middle of the narrowing film layer, a scattering surface is arranged on the inner wall of the through hole and scatters light emitted by the light emitting unit, so that the light emitted by the light emitting unit is circularly transmitted along the circumferential direction in the narrowing film layer, and the spectral line width of the light emitted by the light emitting unit is reduced.
CN202010244736.9A 2020-03-31 2020-03-31 Display substrate, preparation method thereof and display device Active CN111430568B (en)

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JP2000284726A (en) * 1999-03-31 2000-10-13 Seiko Epson Corp Display device
JP4406572B2 (en) * 2004-03-03 2010-01-27 株式会社 日立ディスプレイズ LIGHT EMITTING ELEMENT AND DISPLAY DEVICE THEREOF
KR102156764B1 (en) * 2013-11-13 2020-09-16 엘지디스플레이 주식회사 Organic light emitting diode display device and method for fabricating the same
KR102159150B1 (en) * 2014-01-07 2020-09-24 삼성디스플레이 주식회사 Organic light-emitting display apparatus
CN109817832B (en) * 2019-02-13 2024-04-23 合肥鑫晟光电科技有限公司 OLED display substrate, preparation method thereof and display device

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