CN109860272B - Display substrate and display device - Google Patents
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- CN109860272B CN109860272B CN201910309693.5A CN201910309693A CN109860272B CN 109860272 B CN109860272 B CN 109860272B CN 201910309693 A CN201910309693 A CN 201910309693A CN 109860272 B CN109860272 B CN 109860272B
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Abstract
The invention provides a display substrate and a display device, belongs to the technical field of display, and can solve the problem of poor display caused by the fact that blue light emitted by a blue sub-pixel excites a red sub-pixel to emit light in the conventional display substrate. The display substrate of the present invention includes: a substrate on which a plurality of display devices are disposed; the display device includes: a first OLED device for emitting light of a first color and a second OLED device for emitting light of a second color; a light shielding structure is arranged between the first OLED device and the second OLED device and used for shielding the light of the first color so as to prevent the light of the first color from exciting a light emitting layer of the second OLED device to emit light of a second color.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display substrate and a display device.
Background
At present, Organic Light-Emitting diodes (OLEDs) have become the mainstream of the display field due to their low power consumption, high color saturation, wide viewing angle, thin thickness, flexible display capability, and the like.
In the conventional OLED display panel, three colors of pixels, i.e., r (red), g (green), and b (blue), are usually included to realize a full color display.
Among them, the inventors found that when the blue sub-pixel of the display panel is driven by a single electric quantity, the red sub-pixel beside the blue sub-pixel may have a poor display phenomenon of being slightly bright, which results in a color coordinate shift and poor image quality of the display panel.
Disclosure of Invention
The present invention is directed to at least one of the problems of the prior art, and provides a display substrate capable of solving the problem of poor display caused by the blue light emitted from the blue sub-pixel exciting the red sub-pixel to emit light.
The technical scheme adopted for solving the technical problem of the invention is a display substrate, which comprises: a substrate on which a plurality of display devices are disposed; the display device includes: a first OLED device for emitting light of a first color and a second OLED device for emitting light of a second color;
a light shielding structure is arranged between the first OLED device and the second OLED device and used for shielding the light of the first color so as to prevent the light of the first color from exciting a light emitting layer of the second OLED device to emit light of a second color.
Preferably, the display substrate further includes: a pixel defining layer;
the light shielding structure is arranged on one side of the pixel limiting layer close to the substrate; in a plane perpendicular to the substrate, an orthographic projection of the light shielding structure covers an orthographic projection of the light emitting layer of the first OLED device corresponding to the light shielding structure.
Preferably, the light shielding structure has a light reflecting surface close to the first OLED device; the light reflecting surface is used for reflecting the light emitted by the first OLED device.
Further preferably, the display substrate comprises a top emission type display substrate;
the top emission type display substrate includes: a reflective structure disposed below the first OLED device and/or the second OLED device;
the shading structure and the reflecting structure are arranged on the same layer and are made of the same material.
Further preferably, the display substrate comprises a top emission type display substrate;
the first and/or second OLED device includes: the reflecting electrode is arranged on one side of the light-emitting layer close to the substrate;
the shading structure and the reflecting electrode are arranged on the same layer and are made of the same material.
Preferably, the material of the reflective electrode includes a reflective metal.
Further preferably, the light reflective metal comprises silver.
Preferably, the first OLED device is configured to emit blue light; the second OLED device is for emitting red light.
The technical scheme adopted for solving the technical problem of the invention is a display device which comprises any one of the display substrates.
Drawings
FIG. 1 is a schematic structural diagram of a display substrate according to an embodiment of the invention;
FIG. 2 is a schematic plan view of a display substrate according to an embodiment of the invention;
wherein the reference numerals are: 1. a substrate; 2. an OLED device; 21. a first electrode; 22. a light emitting layer; 23. a second electrode; 3. a pixel defining layer; 4. a light shielding structure.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Embodiments of the present invention provide a display substrate that is particularly suitable for use in an OLED display substrate. The display substrate includes: a substrate 1, and a plurality of display devices disposed on the substrate 1. The display device comprises at least two different color OLED devices 2 (i.e. hereinafter a first OLED device for emitting light of a first color and a second OLED device for emitting light of a second color).
The light emitting layers 22 of the first and second OLED devices are made of different materials, the light emitted by the first OLED device and the light emitted by the second OLED device are two different colors of light, the light energy of the first color of light is greater than the light energy of the second color of light, and when the first color of light is irradiated into the light emitting layer 22 of the second OLED device, the light emitting layer 22 of the second OLED device is excited to emit the second color of light.
Specifically, in this embodiment, the OLED device 2 in the display substrate may include: red OLED devices, green OLED devices, blue OLED devices, and the like. Because the light energy of red light is much larger than that of blue light, the escaping light of the blue light waveguide is more likely to be totally reflected by the pixel limiting layer 3 and the like and enter the adjacent red OLED device to excite the light emitting layer 22 of the red OLED device to emit red light. Therefore, in the embodiment of the present invention, it is preferable to describe the first OLED device as a blue OLED device, and the second OLED device as a red OLED device (accordingly, the blue light of the first color light, and the red light of the second color light).
Example 1:
as shown in fig. 1 and 2, the present embodiment provides a display substrate. The display substrate may include: a substrate 1, and a blue OLED device (left OLED device 2 in fig. 2), a red OLED device (right OLED device 2 in fig. 2) disposed on the substrate 1. It is understood that a green OLED device, a white OLED device, etc. may be further disposed on the substrate 1, which is not limited in this embodiment.
In particular, in the present embodiment, a light shielding structure 4 is further disposed between the blue OLED device and the red OLED device, and the light shielding structure 4 is used for shielding the blue light emitted from the blue OLED device to prevent the blue light from exciting the light emitting layer 22 of the red OLED device to emit red light.
When the display substrate performs display, especially monochrome display (for example, only the blue OLED device is turned on), the blue light emitted by the blue OLED device may enter the red OLED device through the transparent pixel defining layer 3, and the like, that is, when the blue light may enter the light emitting layer 22 of the red OLED device, the light emitting layer 22 of the red OLED device may be excited to emit red light, so that the display substrate may not normally display a pure blue picture, and the display substrate may have display defects of color coordinate shift and poor image quality.
Therefore, as shown in fig. 1 and 2, in the present embodiment, the light shielding structure 4 is disposed between the blue OLED device (the OLED device 22 on the left side in fig. 2) and the red OLED device (the OLED device 2 on the right side in fig. 2), and the blue OLED device and the red OLED device are separated by the light shielding structure 4, so that the blue light emitted from the blue OLED device cannot be incident on the light emitting layer 22 of the red OLED device as much as possible, and thus the light emitting layer 22 of the red OLED device is prevented from emitting red light due to excitation by the blue light as much as possible, thereby reducing the mutual influence between the blue OLED device and the red OLED device in the display substrate, and improving the display defects such as color coordinate shift and poor image quality of the display substrate.
It can be understood that, in this embodiment, specifications of pixels where the blue OLED device and the red OLED device are located are not limited, and areas, shapes, and specific arrangement modes of the pixels where the blue OLED device and the red OLED device are located may be set according to actual situations, and are not described in detail herein.
In this embodiment, the light emitting direction of the display substrate is not limited, and may be top light emitting, bottom light emitting, or double-sided light emitting. In order to more specifically describe the display substrate in this embodiment, a top emission display substrate will be described below as an example of the display substrate.
As shown in fig. 1, the display substrate of the present embodiment includes: the light-emitting device includes a substrate 1, a first electrode 21 (e.g., an anode), a pixel defining layer 3, a light-emitting layer 22, a second electrode 23 (a cathode), and a light-shielding structure 4, which are provided on the substrate 1. The number of the first electrodes 21 is plural, and the first electrodes are insulated and spaced from each other. The pixel defining layer 3 includes a plurality of receiving parts exposing the first electrode 21, the light emitting layers 22 of the OLED devices 2 (including blue OLED devices and red OLED devices) are located in the receiving parts of the pixel defining layer 3, and the light emitting layers 22 of the adjacent OLED devices 2 of the same color located in the same row or the same column may be an integral structure. The second electrode 23 is located above the light-emitting layer 22 (on the side facing away from the substrate 1 in fig. 1), and the second electrodes 23 corresponding to the plurality of first electrodes 21 may be an integral structure. A first electrode 21 and its corresponding light-emitting layer 22 and second electrode 23 form an OLED device 2.
As shown in fig. 1, the light shielding structure 4 may be disposed on a side of the pixel defining layer 3 close to the substrate 1. Specifically, when the display substrate is prepared, the light shielding structure 4 may be formed at a position between the corresponding blue OLED device and the red OLED device of the display substrate before the pixel defining layer 3 is prepared. When the pixel defining layer 3 is formed, the pixel defining layer 3 is formed higher than the prior art at a position corresponding to the light shielding structure 4 (specifically, the pixel defining layer 3 may be raised or a part of the pixel defining layer 3 may be removed at the position as required so that the height of the upper surface of the pixel defining layer 3 is consistent with the height of the upper surface of the pixel defining layer 3 in the prior art), and a receiving portion is formed at a position corresponding to the first electrode 21. In this way, the light emitting layer 22 of the OLED device 2 and the light shielding structure 4 have substantially the same height on the substrate 1, that is, the light shielding structure 4 is located between the light emitting layers 22 of the two OLED devices 2, so as to separate the light emitted from the light emitting layer 22 of the blue OLED device from the light emitting layer 22 of the red OLED device.
Preferably, the orthographic projection of the light-shielding structure 4 covers the orthographic projection of the light-emitting layer 22 in a plane perpendicular to the substrate 1. As shown in fig. 1, the distance between the lower surface of the light shielding structure 4 and the substrate 1 is less than or equal to the distance between the lower surface of the light emitting layer 22 and the substrate 1, and the distance between the upper surface of the light shielding structure 4 and the substrate 1 is greater than or equal to the distance between the upper surface of the light emitting layer 22 and the substrate 1, that is, the light shielding structure 4 separates the blue OELD device from the red OLED device in the thickness direction (longitudinal direction) of the display substrate. Meanwhile, as shown in fig. 2, the light shielding structure 4 also separates the blue OLED device from the red OLED device in the planar direction (transverse direction) of the display substrate, so that the light shielding structure 4 satisfies the light shielding effect on the light emitted from the light emitting layer 22 of the blue OLED device as much as possible.
Preferably, the light shielding structure 4 has a light reflecting surface close to the blue OLED device; the light reflecting surface is used for reflecting the light emitted by the blue OLED device. That is, in this embodiment, while blocking the blue light emitted by the blue OLED device, the light-reflecting structure 4 preferably reflects the blocked blue light back to the area where the blue OLED device is located, so that the part of the light is emitted out of the display substrate from the area where the blue OLED device is located, thereby avoiding light loss of the blue OLED device as much as possible and ensuring the light-emitting efficiency of the display substrate.
As one embodiment, when the display substrate is a top emission type display substrate, the display substrate may further include: a reflective structure arranged below the OLED device 2. The reflecting structure is used for reflecting light emitted by the OLED device 2 and emitted to one side of the substrate 1 so as to increase the light extraction efficiency of the OLED device 2. In this case, the light shielding structure 4 may be disposed on the same layer and made of the same material as the reflective structure. That is, the light shielding structure 4 and the reflective structure can be formed by a single patterning process, so as to simplify the manufacturing process of the display substrate.
Alternatively, as another embodiment, when the display substrate is a top emission type display substrate, the OLED device 2 (blue OLED device and/or red OLED device) may include: the reflecting electrode is arranged on one side of the light-emitting layer 22 close to the substrate 1; the light shielding structure 4 and the reflective electrode are arranged in the same layer and made of the same material. That is, the first electrode 21 is a reflective electrode. Specifically, the material of the first electrode 21 may include a light-reflecting metal, and specifically, may be a light-reflecting metal material such as silver.
It should be noted that the first electrode 21 may also be formed by a multi-layer structure material, such as an ITO/Ag/ITO stacked layer, and in this case, the light shielding structure 4 may be formed by a one-step patterning process with respect to a material (such as silver) having a light reflecting property.
Meanwhile, it is understood that, in order to achieve the light shielding effect and the light reflecting effect of the light shielding structure 4, the thickness of the light shielding structure 4 should be greater than the thickness of the first electrode 21 (or the reflective structure).
Example 2:
the present embodiment provides a display device including any one of the display substrates provided in embodiment 1.
Since the display device in this embodiment includes the display substrate provided in embodiment 1, the influence between pixels when the OLED device emits light is small in this embodiment, and display defects such as color coordinate shift and poor image quality of the display substrate can be significantly improved.
The display device may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A display substrate, comprising: a substrate on which a plurality of display devices are disposed; characterized in that the display device comprises: a first OLED device for emitting light of a first color and a second OLED device for emitting light of a second color;
a light shielding structure is arranged between the first OLED device and the second OLED device and is used for shielding the light of the first color so as to prevent the light of the first color from exciting a light emitting layer of the second OLED device to emit light of a second color;
the display substrate further includes: a pixel defining layer;
the light shielding structure is arranged on one side of the pixel limiting layer close to the substrate; in a plane perpendicular to the substrate, an orthographic projection of the light shielding structure covers an orthographic projection of the light emitting layer of the first OLED device corresponding to the light shielding structure.
2. The display substrate of claim 1, wherein the light blocking structure has a light reflecting surface proximate to the first OLED device; the light reflecting surface is used for reflecting the light emitted by the first OLED device.
3. The display substrate of claim 2, wherein the display substrate comprises a top emission type display substrate;
the top emission type display substrate includes: a reflective structure disposed below the first OLED device and/or the second OLED device;
the shading structure and the reflecting structure are arranged on the same layer and are made of the same material.
4. The display substrate of claim 2, wherein the display substrate comprises a top emission type display substrate;
the first and/or second OLED device includes: the reflecting electrode is arranged on one side of the light-emitting layer close to the substrate;
the shading structure and the reflecting electrode are arranged on the same layer and are made of the same material.
5. The display substrate of claim 4, wherein the material of the reflective electrode comprises a light reflective metal.
6. The display substrate of claim 5, wherein the light reflective metal comprises silver.
7. The display substrate of claim 1, wherein the first OLED device is configured to emit blue light; the second OLED device is for emitting red light.
8. A display device comprising the display substrate according to any one of claims 1 to 7.
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| CN201910309693.5A CN109860272B (en) | 2019-04-17 | 2019-04-17 | Display substrate and display device |
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| CN201910309693.5A CN109860272B (en) | 2019-04-17 | 2019-04-17 | Display substrate and display device |
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| CN109860272B true CN109860272B (en) | 2021-01-29 |
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| CN110911460B (en) * | 2019-11-25 | 2022-04-26 | 深圳市华星光电半导体显示技术有限公司 | Display panel and preparation method thereof |
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| KR101972169B1 (en) * | 2012-10-05 | 2019-04-26 | 삼성디스플레이 주식회사 | Organic light emitting display device and manufacturing method thereof |
| CN105118928B (en) * | 2015-07-29 | 2018-02-09 | 京东方科技集团股份有限公司 | Color membrane substrates, its preparation method, OLED display panel and display device |
| CN105789260B (en) * | 2016-04-26 | 2020-04-21 | Tcl集团股份有限公司 | Transparent display panel and preparation method thereof |
| CN105870154B (en) * | 2016-04-28 | 2019-04-05 | 京东方科技集团股份有限公司 | A kind of array substrate and preparation method thereof, OLED display |
| CN106158914A (en) * | 2016-07-29 | 2016-11-23 | 京东方科技集团股份有限公司 | OLED array and preparation method thereof, OLED display panel |
| CN106340597B (en) * | 2016-08-31 | 2019-01-18 | 纳晶科技股份有限公司 | Luminescent device |
| CN107275377B (en) * | 2017-06-28 | 2020-05-05 | 武汉华星光电半导体显示技术有限公司 | OLED device and display device |
| CN107611274A (en) * | 2017-09-05 | 2018-01-19 | 上海天马有机发光显示技术有限公司 | Organic electroluminescence display panel and organic light-emitting display device |
| CN109148538A (en) * | 2018-08-27 | 2019-01-04 | 京东方科技集团股份有限公司 | The manufacturing method of display base plate, display device and display base plate |
| CN109585518B (en) * | 2018-12-17 | 2020-05-12 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
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