CN216054781U - Display substrate and display device - Google Patents
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- CN216054781U CN216054781U CN202120655341.8U CN202120655341U CN216054781U CN 216054781 U CN216054781 U CN 216054781U CN 202120655341 U CN202120655341 U CN 202120655341U CN 216054781 U CN216054781 U CN 216054781U
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Abstract
The utility model provides a display substrate and a display device, and belongs to the technical field of display. Wherein, the display substrate includes: a base substrate having a driving circuit layer; a pixel defining layer on the substrate base plate, the pixel defining layer defining a plurality of open regions; the light-emitting unit is positioned in the opening area and comprises a first electrode, an organic functional layer and a second electrode which are sequentially arranged along the direction far away from the substrate; the light emitting unit includes a first side facing the substrate base, a second side far away from the substrate base, and a side surface between the first side and the second side, and the display base further includes: a light-reflecting layer covering at least part of the side surface. The technical scheme of the utility model can improve the light-emitting efficiency of the display substrate.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display substrate and a display device.
Background
An Organic Light-Emitting Diode (OLED) display device has been classified as a next-generation display technology with great development prospect because of its advantages of thinness, lightness, wide viewing angle, active Light emission, continuously adjustable Light emission color, low cost, fast response speed, low energy consumption, low driving voltage, wide working temperature range, simple production process, high Light-Emitting efficiency, flexible display, etc.
SUMMERY OF THE UTILITY MODEL
The utility model provides a display substrate and a display device, which can improve the light extraction efficiency of the display substrate.
To solve the above technical problem, embodiments of the present invention provide the following technical solutions:
in one aspect, a display substrate is provided, including:
a base substrate having a driving circuit layer;
a pixel defining layer on the substrate base plate, the pixel defining layer defining a plurality of open regions;
the light-emitting unit is positioned in the opening area and comprises a first electrode, an organic functional layer and a second electrode which are sequentially arranged along the direction far away from the substrate;
the light emitting unit includes a first side facing the substrate base, a second side far away from the substrate base, and a side surface between the first side and the second side, and the display base further includes:
a light-reflecting layer covering at least part of the side surface.
In some embodiments, an angle between a tangent to a surface of the light reflecting layer close to the light emitting unit and a tangent to a surface of the first electrode far from the substrate base plate is less than 90 degrees.
In some embodiments, the thickness of the light reflecting layer in a direction parallel to the substrate base is greater than or equal to 50 nm.
In some embodiments, the light reflecting layer is made of a conductive material.
In some embodiments, the light reflecting layer includes a first light reflecting pattern contacting the first electrode and a second light reflecting pattern contacting the second electrode, with an insulating pattern interposed between the first light reflecting pattern and the second light reflecting pattern.
In some embodiments, the organic functional layer includes a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer, which are sequentially stacked in a direction away from the substrate base plate, and the first light-reflecting pattern is insulated from the hole blocking layer and the second light-reflecting pattern is insulated from the hole transport layer.
In some embodiments, the light emitting layer and the insulating pattern are of a unitary structure.
In some embodiments, an orthographic projection of the hole transport layer on the substrate base plate is positioned in an orthographic projection of the hole injection layer on the substrate base plate, the hole injection layer covers a side surface of the hole transport layer, and the hole transport layer is not in contact with the first light reflecting pattern;
the orthographic projection of the light-emitting layer on the substrate base plate is positioned in the orthographic projection of the hole transport layer on the substrate base plate, the hole transport layer covers part of the side surface of the light-emitting layer, and the light-emitting layer is not in contact with the first light-reflecting pattern.
In some embodiments, an orthographic projection of the hole injection layer on the substrate base plate is located in an orthographic projection of the first electrode on the substrate base plate, the first electrode covers a side surface of the hole injection layer, and the hole injection layer is not in contact with the first light-reflecting pattern.
In some embodiments, an orthographic projection of the light emitting layer on the substrate base plate is positioned within an orthographic projection of the hole blocking layer on the substrate base plate;
the orthographic projection of the hole blocking layer on the substrate base plate is located in the orthographic projection of the electron transport layer on the substrate base plate, the electron transport layer covers the side surface of the hole blocking layer, and the hole blocking layer is not in contact with the second light reflecting pattern.
In some embodiments, an orthographic projection of the electron transport layer on the substrate base plate is located in an orthographic projection of the electron injection layer on the substrate base plate, the electron injection layer covers a side surface of the electron transport layer, and the side surface of the electron transport layer is not in contact with the second light reflecting pattern.
In some embodiments, an orthographic projection of the electron injection layer on the substrate base plate is located in an orthographic projection of the second electrode on the substrate base plate, the second electrode covers a side surface of the electron injection layer 206, and the side surface of the electron injection layer is not in contact with the second light reflecting pattern.
In some embodiments, the display substrate further comprises:
and the light extraction layer is positioned on the light outlet side of the light emitting unit, and the refractive index of the light extraction layer is smaller than that of the substrate base plate.
In some embodiments, the light extraction layer has a single-layer structure with a refractive index that decreases in a light extraction direction, and the light extraction direction is a direction of the light extraction layer away from the organic functional layer; or
The material of the light extraction layer comprises a spherical molecular material; or
And a plurality of hemispherical microstructures which are arranged in an array are arranged on the surface of one side of the light extraction layer facing the light-emitting unit.
Embodiments of the present invention also provide a display device, including the display substrate as described above.
The embodiment of the utility model has the following beneficial effects:
in the above scheme, the display substrate is provided with the reflective layer for coating the side surface of the light-emitting unit, and after the side light emitted by the light-emitting unit irradiates the reflective layer, the reflective layer can emit the part of light to the display side in a reflective mode, so that the side light loss of the light-emitting unit is reduced, and the light-emitting efficiency of the display substrate is improved.
Drawings
FIGS. 1-2 are schematic cross-sectional views of a display substrate according to an embodiment of the utility model;
FIG. 3 is a schematic plan view of a display substrate according to an embodiment of the utility model;
fig. 4-11 are cross-sectional views of display substrates according to some embodiments of the utility model.
Reference numerals
100 second electrode
200 organic functional layer
300 first electrode
400 substrate
500 light reflecting layer
600 insulating pattern
700 light extraction layer
800 light emitting area
201 hole injection layer HIL
202 hole transport layer HTL
203 light emitting layer EML
204 hole blocking layer HBL
205 electron transport layer ETL
206 electron injection layer EIL
501 first light reflecting pattern
502 second light reflecting pattern
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
In general, light emitting devices may be classified into Organic Light Emitting Diode (OLED) devices having a light emitting layer formed of an organic material and inorganic light emitting devices having a light emitting layer formed of an inorganic material. The organic light emitting phenomenon refers to a phenomenon of converting electric energy into light energy using an organic material. When an appropriate organic material layer is positioned between the first electrode and the second electrode and a voltage is applied between the two electrodes, holes are injected from the first electrode into the organic material layer and electrons are injected from the second electrode into the organic material layer. Excitons are generated when the injected holes and electrons meet, and light is generated when the excitons drop to a ground state. The OLED display device has a series of advantages such as low driving voltage, wide viewing angle, high resolution, short response time, and good natural color reproducibility.
But only about 20% of the light generated from the OLED exits the OLED device, the light extraction efficiency of the display substrate is to be improved.
Embodiments of the utility model provide a display substrate and a display device, which can improve the light extraction efficiency of the display substrate.
An embodiment of the present invention provides a display substrate, as shown in fig. 1, including:
a substrate base plate 400, the substrate base plate 400 having a driving circuit layer;
a pixel defining layer on the substrate base plate 400, the pixel defining layer defining a plurality of opening regions;
a light emitting unit located in the opening region, the light emitting unit including a first electrode 300, an organic functional layer 200, and a second electrode 100 sequentially arranged in a direction away from the base substrate 400;
the light emitting unit includes a first side facing the substrate base 400, a second side far from the substrate base 400, and a side surface between the first side and the second side, and the display base further includes:
a light reflecting layer 500 covering at least a portion of the side surface.
In this embodiment, the display substrate is provided with the reflective layer 500 covering the side surface of the light emitting unit, and after the side light emitted by the light emitting unit irradiates the reflective layer 500, the reflective layer 500 can emit the part of light to the display side in a reflective manner, so that the side light loss of the light emitting unit is reduced, and the light emitting efficiency of the display substrate is improved.
The display substrate of the present embodiment may be an OLED display substrate, and may also be a QLED (quantum dot light emitting diode) display substrate, a MINILED (micro light emitting diode) display substrate, a micro led (micro organic electroluminescent diode) display substrate, or the like.
The substrate may be a glass substrate, a quartz substrate, or a silicon substrate, and may also be a flexible substrate, such as a polyimide film. When the substrate base plate adopts a glass base plate, a quartz base plate or a flexible base plate, the substrate base plate not only comprises the glass base plate, the quartz base plate or the flexible base plate, but also comprises a thin film transistor array layer positioned on the glass base plate, the quartz base plate or the flexible base plate; when a silicon substrate is used as the substrate base plate, a driver circuit layer is integrated inside the silicon substrate.
In the present embodiment, the first electrode 300 may be one of an anode and a cathode, and the second electrode 100 may be the other of the anode and the cathode. The second electrode 100 may be a metal layer having a light reflection characteristic, the first electrode 300 may be an ultra-thin conductive layer having a light transmission characteristic, and the material of the first electrode 300 includes, but is not limited to, Indium Tin Oxide (ITO).
Since the second electrode 100 has a light reflection property, light emitted from the organic functional layer 200 is irradiated onto the second electrode 100, and due to the light reflection property, the second electrode 100 reflects the light, passes through the organic functional layer 200 again, is emitted through the transparent first electrode 300, passes through the transparent base substrate 400, and emits visible light.
However, not all of the light generated by the organic functional layer 200 can be emitted through the base substrate 400. The light emission is non-directional, and is scattered along the light source, only a part of the light can be emitted through the underlying substrate 400 in the above manner, and a part of the light propagates to the side of the organic functional layer 200 and propagates in the display substrate without being emitted through the underlying substrate 400, which causes light loss, so that the light emitted from the organic functional layer 200 is lost through the waveguide effect and the like, and the light emitting efficiency of the display substrate is only about 20%.
Therefore, in the present embodiment, the light reflecting layer 500 is disposed on the side surface of the light emitting unit, and the light of the side loss part is emitted to the substrate 400 by reflection, so as to improve the light extraction efficiency and reduce the light loss at the side surface of the organic functional layer 200. The light reflection layer 500 may be one or more of high reflectance and non-transparency metal such as copper (Cu), silver (Ag), gold (Au), etc., but is not limited thereto.
As shown in fig. 2, the organic functional layer 200 includes a hole injection layer 201, a hole transport layer 202, a light emitting layer 203, a hole blocking layer 204, an electron transport layer 205, and an electron injection layer 206, which are sequentially stacked in a direction away from the substrate 400, when the display substrate is in operation, holes are injected from the first electrode 300 into the light emitting layer 203, electrons are injected from the second electrode 100 into the light emitting layer 203, excitons are generated in the light emitting layer 203 when the injected holes and electrons meet, and the light emitting layer 203 is excited to emit light, a dotted line in fig. 2 is a propagation direction of light emitted from the light emitting layer 203, and light emitted from the light emitting layer 203 can propagate toward a side away from the substrate 400, can also propagate toward the substrate 400, and can also propagate laterally. After the light rays propagating laterally irradiate the reflective layer 500, the light rays are reflected by the reflective layer 500 and exit towards the display side (i.e. the side far away from the substrate 400); the light propagating toward the substrate 400 is reflected by the substrate 400 and then illuminates the reflective layer 500, and then is reflected again by the reflective layer 500 and exits toward the display side, so that the light extraction efficiency of the display substrate can be improved.
In this embodiment, the reflective layer 500 may cover a part of the side surface of the light emitting unit, or may cover the whole side surface of the light emitting unit, and the larger the area of the reflective layer 500 is, the more the reflected light is, which is more beneficial to improving the light emitting efficiency of the display substrate.
The reflective layer 500 may be made of an insulating material, and if the reflective layer 500 is made of an insulating material, the reflective layer 500 may cover the whole of the side surface of the light emitting unit; the reflective layer 500 may also be made of a conductive material, such as a conductive metal, and when the reflective layer 500 is made of a conductive material, in order to prevent the reflective layer 500 from conducting the first electrode 300 and the second electrode 100, which may cause the second electrode 100 and the first electrode 300 to be shorted, the reflective layer 500 may not cover the whole of the side surface.
As shown in fig. 1 and 2, when the light reflecting layer 500 is made of a conductive material, the light reflecting layer 500 includes a first light reflecting pattern 501 in contact with the first electrode 300 and a second light reflecting pattern 502 in contact with the second electrode 100, an insulating pattern 600 is spaced between the first light reflecting pattern 501 and the second light reflecting pattern 502, and the insulating pattern 600 can prevent the first electrode 300 and the second electrode 100 from being connected. In order to increase the area of the light reflecting layer 500, the embodiment divides the light reflecting layer 500 into the first light reflecting pattern 501 and the second light reflecting pattern 502, and arranges the insulation pattern 600 to separate the first light reflecting pattern 501 and the second light reflecting pattern 502, so that the light reflecting layer 500 covers most of the side surface of the light emitting unit.
When the reflective layer 500 is made of a conductive material, the first reflective pattern 501 is communicated with the first electrode 300 to transmit holes, and the second reflective pattern 502 is communicated with the second electrode 100 to transmit electrons, so that the first reflective pattern 501 can indirectly increase the contact area between the first electrode 300 and the organic functional layer 200, and the second reflective pattern 502 can indirectly increase the contact area between the second electrode 100 and the organic functional layer 200, thereby assisting the injection of carriers into the organic functional layer 200, increasing the concentration of excitons compounded by carriers in the light emitting layer 203, and further improving the light emitting performance of the display substrate.
In this embodiment, the insulating pattern 600 may employ an organic insulating material, such as acrylic resin; an inorganic insulating material, such as silicon nitride, silicon oxide, etc., may also be used as long as it can prevent the first and second light reflecting patterns 501 and 502 from being connected.
In this embodiment, when the light reflecting layer 500 and the light emitting unit are manufactured, each film layer may be formed by thermal vapor deposition in a vacuum chamber. Specifically, the first electrode 300, the hole injection layer 201, and the hole transport layer 202 may be evaporated by using a fine metal mask, the first light reflecting pattern 501, the light emitting layer 203, and the insulating pattern 600 are formed, the hole blocking layer 204, the electron transport layer 205, the electron injection layer 206, and the second light reflecting pattern 502 are sequentially formed, and the second electrode 100 may be a planar electrode covering the entire display area of the display substrate.
In this embodiment, since the second electrode 100 and the reflective layer 500 both have reflective properties, the second electrode 100 and the reflective layer 500 may be made of the same material, for example, the second electrode 100 and the reflective layer 500 may both use Ag or Mg, so that the second electrode 100 and the reflective layer 500 may be manufactured by using the same film forming apparatus, and compared with the existing apparatus for manufacturing a display substrate, there is no need to add a new film forming apparatus to form the reflective layer 500.
Due to molecular diffusion in the vapor deposition process, in the display substrate, the interface between the reflective layer 500 and the organic functional layer 200 has a certain inclination, so that the angle between the tangent of the surface of the reflective layer close to the light-emitting unit and the tangent of the surface of the first electrode far from the substrate is less than 90 degrees, which is more favorable for the reflected light to exit from one side of the first electrode 300.
If the thickness of the reflective layer 500 is too small, for example, less than 50nm, the reflective layer 500 can transmit a certain light, which may affect the reflective performance of the reflective layer 500 and further affect the light extraction efficiency of the display substrate; if the thickness of the light reflecting layer 500 is too large, for example, greater than 100nm, since the light reflecting layer 500 is located in the pixel region, deposition of each film layer of the light emitting unit may be affected, and preferably, the thickness of the light reflecting layer 500 in a direction parallel to the substrate may be greater than or equal to 50nm, and preferably, 50 to 100nm, so that both the reflection performance of the light reflecting layer 500 and the performance of the light emitting unit may be considered.
Fig. 3 is a schematic plan view of the display substrate, and it can be seen that the light-reflecting layer 500 surrounds the light-emitting region and reflects the side light of the light-emitting region. In fig. 3, the light emitting region is square, but the light emitting region is not limited to square, and may have other shapes such as a circle, a hexagon, or other irregular shapes.
In a specific example, as shown in fig. 2, the organic functional layer 200 includes a hole injection layer 201, a hole transport layer 202, a light emitting layer 203, a hole blocking layer 204, an electron transport layer 205, and an electron injection layer 206, which are sequentially stacked in a direction away from the substrate 400, the first light reflecting pattern 501 may extend from the first electrode 300 to the hole transport layer 202 and be insulated from the hole blocking layer 204, and the second light reflecting pattern 502 may extend from the electron injection layer 206 to the hole blocking layer 204 and be insulated from the hole transport layer 202, so that the first light reflecting pattern 501 may prevent holes from being transported to the hole blocking layer 204 by crossing the light emitting layer 203, and the second light reflecting pattern 502 may prevent electrons from being transported to the hole transport layer 202 by crossing the light emitting layer 203, which may affect the normal operation of the light emitting unit.
In some embodiments, as shown in fig. 4, the display substrate further includes:
a light extraction layer 700 located at the light extraction side of the light emitting unit, wherein the refractive index of the light extraction layer 700 is smaller than that of the substrate base plate 400. The total reflection can be reduced by the light extraction layer 700, the light extraction is increased, and the light extraction efficiency of the display substrate is further improved.
In some embodiments, the light extraction layer 700 has a single-layer structure with a refractive index decreasing in a light extraction direction, which is a direction of the light extraction layer 700 away from the light-emitting layer 203.
The light emitting direction is a direction in which the light extraction layer 700 is away from the light emitting layer 203.
In this embodiment, the refractive index of the light extraction layer 700 decreases in the light extraction direction, and the wide-angle interference and the multi-beam interference can be controlled, so that the light extraction rate of the display substrate can be increased, and the viewing angle can be increased; on the other hand, compared with the light extraction layer 700 which adopts a multi-layer structure with the refractive index having a stepwise decreasing trend, and the light energy loss caused by the interface between the layers when the light penetrates through the light extraction layer 700, in this embodiment, the light extraction layer 700 adopts a single-layer structure with the refractive index having a decreasing trend, that is, the light extraction layer 700 does not have the interface between the layers with different refractive indexes along the light exit direction, so that the light energy loss caused by the interface between the layers when the light penetrates through the light extraction layer 700 is avoided, and the light extraction rate of the OLED device is further improved.
Here, the light extraction layer 700 having a single-layer structure in which the refractive index decreases in the light extraction direction means that the refractive index of the light extraction layer 700 decreases in the light extraction direction, but there is no interface between regions having different refractive indices.
On this basis, since the refractive index of the light extraction layer 700 is in a gradual change trend, the light extraction layer 700 needs to be formed by at least two materials with different refractive indexes.
Here, the material constituting the light extraction layer 700 may be inorganic compounds, for example, ZnO, ZnS, ZnSe, TeO2、WO3、MoO3Inorganic substances having a relatively high refractive index, such as MgO, LiF, but not limited to these inorganic compounds; also organic compounds, e.g. Alq3、Liq3Organic substances having a relatively high refractive index, such as MeO-TPD, BCP, etc., but are not limited to these organic compounds. In practice, the two materials may be two inorganic compounds, or two organic compounds, or one inorganic compound and one organic compound, which are not limited in the present invention.
For example, the light extraction layer 700 includes, in the thickness direction: the light extraction layer 700 has a single-layer structure, in which the refractive index of the first refractive index material is greater than that of the second refractive index material, so that the light extraction layer 700 has a continuous gradually decreasing trend of the refractive index along the light exit direction.
It should be noted that the content of the first refractive index material and the second refractive index material may be a weight percentage.
It should be understood here that, in the light extraction layer 700, in the light exit direction, the content of the first refractive index material having a larger refractive index gradually and continuously decreases, and the content of the second refractive index material having a smaller refractive index gradually and continuously increases; that is, the light extraction layer 700 has a single-layer structure as a whole, and the content of the material with a high refractive index is less and less, and the content of the material with a low refractive index is more and more along the light extraction direction, so that the refractive index of the light extraction layer 700 with the single-layer structure gradually decreases continuously along the light extraction direction as a whole.
As described above, in any of the light extraction layers 700, it is preferable that the difference between the refractive index of the light extraction layer 700 on the side in contact with the first electrode and the refractive index on the side away from the first electrode is 0.1 or more; it should of course be understood that the refractive index of the side of the light extraction layer 700 remote from the first electrode must be greater than that of air.
Specifically, in the case where the difference between the refractive index N1 on the side of the light extraction layer 700 in contact with the first electrode and the refractive index N2 on the side away from the first electrode is less than 0.1, that is, 0 < N1-N2 < 0.1, the degree of control over wide-angle interference and multi-beam interference is small because the difference between the refractive indices on both sides is too small, so that the light extraction rate from the display substrate is increased, and the increase in viewing angle is limited. Therefore, it is preferable that the difference between the refractive index of the light extraction layer 700 on the side in contact with the first electrode and the refractive index on the side away from the first electrode is 0.1 or more.
In addition, the thickness of the light extraction layer is preferably 20nm to 500 nm.
Specifically, if the thickness of the light extraction layer is less than 20nm, the thickness is too small (and the above-mentioned condition of decreasing refractive index is also required), so that the requirement on the manufacturing process is high, and the wide-angle interference and the multi-beam interference are not obvious. If the thickness of the light extraction layer is more than 500nm, unnecessary waste is caused due to the excessive thickness, and the design concept of light and thinness is not facilitated; therefore, the thickness of the extraction layer is preferably in the range of 20nm to 500nm, and may of course include 20nm and 500 nm.
In addition, it should be understood by those skilled in the art that, in order to ensure that the light extraction layer can control wide-angle interference and multi-beam interference as much as possible, it is necessary to select and set a reasonable thickness of the light extraction layer within the above-mentioned preferred thickness range according to the actual light beam (e.g., wavelength) and the refractive index range of the energy of the light extraction layer.
In some embodiments, the material of the light extraction layer 700 includes a spherical molecular material, specifically, the material of the light extraction layer 700 is spherical molecule C70, so that the light extraction layer 700 has a micro-nano structure by using its own molecular stacking manner, which can reduce total reflection of light emitted from the display substrate and improve the light extraction rate.
The C70 is a spherical molecule with a special structure, a fine micro-nano structure can be formed when the spherical molecule is deposited on the substrate, the fine micro-nano structure is similar to a micro lens or a scattering layer with a plurality of microspheres, the surface roughness of the film can be further increased, the ray angle with the original incident angle larger than the critical angle can be reduced by the light taking layer 700 formed by the C70 material, the total reflection of emergent light is reduced, and the light taking rate is improved. The light extraction layer 700 has a high transmittance in the whole visible light range, so that the generated photons can be prevented from being absorbed too much; by using the stacking mode of C70, the light extraction layer 700 forms a fine micro-nano structure, thereby reducing total reflection and increasing light extraction.
In some embodiments, a plurality of hemispherical microstructures arranged in an array are disposed on a side surface of the light extraction layer 700 facing the light emitting unit, and specifically, a plurality of nano-scale microstructures arranged in an array are formed on a side surface of the light extraction layer 700 facing the light emitting unit, and the shape of the microstructures is hemispherical, but the shape of the microstructures is not limited to be hemispherical, and other shapes, such as a semi-ellipsoid shape, may also be adopted. The hemispherical microstructure can reduce total reflection and increase light extraction, and can change the propagation direction of light, as shown in fig. 5, when the light emitted from the light emitting layer 203 propagates to the light extraction layer 700, the propagation direction of a large portion of light forms an angle smaller than 90 ° with the substrate 400.
In some embodiments, as shown in fig. 6, the organic functional layer 200 includes a hole injection layer 201, a hole transport layer 202, a light emitting layer 203, a hole blocking layer 204, an electron transport layer 205, and an electron injection layer 206, which are sequentially stacked in a direction away from the substrate 400, wherein the light emitting layer 203 may be integrated with the insulating pattern 600, such that the structure of the display substrate may be simplified, and in addition, the contact area between the light emitting layer 203 and the first and second light reflecting patterns 501 and 502 may be increased, such that the concentration of excitons formed by recombination of carriers in the light emitting layer 203 may be increased, and the light emitting performance of the display substrate may be further improved.
In some embodiments, as shown in fig. 7, the organic functional layer 200 includes a hole injection layer 201, a hole transport layer 202, a light emitting layer 203, a hole blocking layer 204, an electron transport layer 205, and an electron injection layer 206, which are sequentially stacked in a direction away from the substrate 400, an orthogonal projection of the hole transport layer 202 on the substrate 400 is located in an orthogonal projection of the hole injection layer 201 on the substrate 400, the hole injection layer 201 covers a side surface of the hole transport layer 202, and the hole transport layer 202 is not in contact with the first light reflecting pattern 501; the orthographic projection of the light-emitting layer 203 on the substrate 400 is positioned in the orthographic projection of the hole transport layer 202 on the substrate 400, the hole transport layer 202 covers part of the side surface of the light-emitting layer 203, and the light-emitting layer 203 is not in contact with the first light-reflecting pattern 501. As shown in fig. 7, the display substrate of this embodiment adopts such a structural design, which can increase the contact area between the hole injection layer 201 and the first light reflecting pattern 501, indirectly increase the contact area between the hole injection layer 201 and the first electrode 300, and is beneficial to increase the number of holes, thereby increasing the concentration of excitons formed by carriers in the light emitting layer 203, and further improving the light emitting performance of the display substrate.
In some embodiments, as shown in fig. 8, the organic functional layer 200 includes a hole injection layer 201, a hole transport layer 202, a light emitting layer 203, a hole blocking layer 204, an electron transport layer 205, and an electron injection layer 206, which are sequentially stacked in a direction away from the substrate 400, an orthogonal projection of the hole injection layer 201 on the substrate 400 is located in an orthogonal projection of the first electrode 300 on the substrate 400, the first electrode 300 covers a side surface of the hole injection layer 201, and the hole injection layer 201 is not in contact with the first light reflecting pattern 501; as shown in fig. 8, the display substrate of the present embodiment adopts such a structural design, which directly increases the contact area between the hole injection layer 201 and the first electrode 300, and is beneficial to increase the number of holes, and further increases the concentration of excitons formed by recombination of carriers in the light emitting layer 203, thereby further improving the light emitting performance of the display substrate.
In some embodiments, as shown in fig. 9, the organic functional layer 200 includes a hole injection layer 201, a hole transport layer 202, a light emitting layer 203, a hole blocking layer 204, an electron transport layer 205, and an electron injection layer 206, which are sequentially stacked in a direction away from the substrate 400, an orthogonal projection of the light emitting layer 203 on the substrate 400 is located in an orthogonal projection of the hole blocking layer 204 on the substrate 400, an orthogonal projection of the hole blocking layer 204 on the substrate 400 is located in an orthogonal projection of the electron transport layer 205 on the substrate 400, the electron transport layer 205 covers a side surface of the hole blocking layer 204, the hole blocking layer 204 is not in contact with the second light reflecting pattern 502, as shown in fig. 9, the display substrate of this embodiment adopts such a structural design that a contact area between the electron transport layer 205 and the second light reflecting pattern can be increased, the contact area between the electron transport layer 205 and the second electrode 100 is increased indirectly, which is beneficial to increase the number of the transported electrons, and further increase the concentration of excitons formed by the carriers in the light emitting layer 203, thereby further improving the light emitting performance of the display substrate.
In some embodiments, as shown in fig. 10, in a direction away from the substrate 400, the organic functional layer 200 includes a hole injection layer 201, a hole transport layer 202, a light emitting layer 203, a hole blocking layer 204, an electron transport layer 205, and an electron injection layer 206, which are sequentially stacked, an orthogonal projection of the electron transport layer 205 on the substrate 400 is located in an orthogonal projection of the electron injection layer 206 on the substrate 400, the electron injection layer 206 covers a side surface of the electron transport layer 205, and a side surface of the electron transport layer 205 is not in contact with the second light reflective pattern 502, so that a contact area between the electron injection layer 206 and the second light reflective pattern 502 can be increased, a contact area between the electron injection layer 206 and the second electrode 100 can be indirectly increased, the number of electrons can be increased, and the exciton concentration compounded by the electron injection layer 203 can be increased, the light emitting performance of the display substrate is further improved.
In some embodiments, an orthographic projection of the electron injection layer 206 on the substrate 400 may be located in an orthographic projection of the second electrode 100 on the substrate 400, the second electrode covers a side surface of the electron injection layer 206, and the side surface of the electron injection layer 206 is not in contact with the second light-reflecting pattern, so that a contact area between the electron injection layer 206 and the second electrode may be directly increased, which is beneficial to increase the number of electrons, and further increase a concentration of excitons formed by recombination of carriers in the light-emitting layer, and further improve a light-emitting performance of the display substrate.
In some embodiments, as shown in fig. 11, the organic functional layer 200 includes a hole injection layer 201, a hole transport layer 202, a light emitting layer 203, a hole blocking layer 204, an electron transport layer 205, and an electron injection layer 206, which are sequentially stacked in a direction away from the base substrate 400, an orthogonal projection of the light emitting layer 203 on the base substrate 400 is located in an orthogonal projection of the hole blocking layer 204 on the base substrate 400, and the hole blocking layer 204 covers a side surface of the light emitting layer 203; the orthographic projection of the hole blocking layer 204 on the substrate 400 is positioned in the orthographic projection of the electron transport layer 205 on the substrate 400, and the electron transport layer 205 covers the side surface of the hole blocking layer 204; the orthographic projection of the electron transport layer 205 on the substrate base plate 400 is positioned in the orthographic projection of the electron injection layer 206 on the substrate base plate 400, the electron injection layer 206 covers the side surface of the electron transport layer 205, and the side surface of the electron transport layer 205 is not in contact with the second light reflecting pattern 502. In the organic functional material, the hole transport speed is faster than the electron transport speed as a whole, and in the light-emitting layer 203, the light-emitting region is close to the second electrode 100 side, the structure of fig. 11 can be adopted to enhance the injection of electrons, realize the movement of the light-emitting region from the second electrode 100 side to the center of the light-emitting layer 203, and prevent excitons from accumulating at a certain interface and affecting the overall performance of the device.
Embodiments of the present invention also provide a display device including the display substrate as described above, having the same structure and advantageous effects as those of the display substrate provided in the foregoing embodiments. Since the foregoing embodiments have described the structure and the beneficial effects of the display substrate in detail, the details are not repeated herein.
On the basis, preferably, the first electrode in the display substrate is located on the side of the second electrode, which is away from the substrate, that is, the display substrate is of a top emission type, and light emitted by the display substrate exits from the top, so that the display substrate is not affected by the arrangement of Thin Film Transistors (TFTs) on the substrate, and a high aperture ratio of the device is ensured; meanwhile, for a given material composition, the working voltage of the top-emitting device can be effectively reduced, and the service life of the whole device can be further prolonged.
The display device includes but is not limited to: radio frequency unit, network module, audio output unit, input unit, sensor, display unit, user input unit, interface unit, memory, processor, and power supply. It will be appreciated by those skilled in the art that the above described configuration of the display device does not constitute a limitation of the display device, and that the display device may comprise more or less of the components described above, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the display device includes, but is not limited to, a display, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, and the like.
The display device may be: the display device comprises a television, a display, a digital photo frame, a mobile phone, a tablet personal computer and any other product or component with a display function, wherein the display device further comprises a flexible circuit board, a printed circuit board and a back plate.
It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the embodiments, since they are substantially similar to the product embodiments, the description is simple, and the relevant points can be referred to the partial description of the product embodiments.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (15)
1. A display substrate, comprising:
a base substrate having a driving circuit layer;
a pixel defining layer on the substrate base plate, the pixel defining layer defining a plurality of open regions;
the light-emitting unit is positioned in the opening area and comprises a first electrode, an organic functional layer and a second electrode which are sequentially arranged along the direction far away from the substrate;
the light emitting unit includes a first side facing the substrate base, a second side far away from the substrate base, and a side surface between the first side and the second side, and the display base further includes:
a light-reflecting layer covering at least part of the side surface.
2. The display substrate of claim 1, wherein an angle between a tangent to a surface of the light reflecting layer adjacent to the light emitting unit and a tangent to a surface of the first electrode remote from the substrate is less than 90 degrees.
3. The display substrate of claim 1, wherein the thickness of the light reflecting layer in a direction parallel to the substrate base is greater than or equal to 50 nm.
4. The display substrate of claim 1, wherein the light reflecting layer is made of a conductive material.
5. The display substrate of claim 4, wherein the light reflecting layer comprises a first light reflecting pattern in contact with the first electrode and a second light reflecting pattern in contact with the second electrode, and an insulating pattern is interposed between the first light reflecting pattern and the second light reflecting pattern.
6. The display substrate according to claim 5, wherein the organic functional layer comprises a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer, which are sequentially stacked in a direction away from the base substrate, wherein the first light reflecting pattern is insulated from the hole blocking layer, and the second light reflecting pattern is insulated from the hole transport layer.
7. The display substrate according to claim 6, wherein the light-emitting layer and the insulating pattern are of a unitary structure.
8. The display substrate of claim 6,
the orthographic projection of the hole transport layer on the substrate is positioned in the orthographic projection of the hole injection layer on the substrate, the hole injection layer covers the side surface of the hole transport layer, and the hole transport layer is not in contact with the first light reflecting pattern;
the orthographic projection of the light-emitting layer on the substrate base plate is positioned in the orthographic projection of the hole transport layer on the substrate base plate, the hole transport layer covers part of the side surface of the light-emitting layer, and the light-emitting layer is not in contact with the first light-reflecting pattern.
9. The display substrate of claim 8,
the orthographic projection of the hole injection layer on the substrate base plate is positioned in the orthographic projection of the first electrode on the substrate base plate, the first electrode covers the side surface of the hole injection layer, and the hole injection layer is not in contact with the first light reflecting pattern.
10. The display substrate according to any one of claims 6 to 9,
the orthographic projection of the light-emitting layer on the substrate base plate is positioned in the orthographic projection of the hole blocking layer on the substrate base plate;
the orthographic projection of the hole blocking layer on the substrate base plate is located in the orthographic projection of the electron transport layer on the substrate base plate, the electron transport layer covers the side surface of the hole blocking layer, and the hole blocking layer is not in contact with the second light reflecting pattern.
11. The display substrate of claim 10,
the orthographic projection of the electron transport layer on the substrate base plate is positioned in the orthographic projection of the electron injection layer on the substrate base plate, the electron injection layer coats the side surface of the electron transport layer, and the side surface of the electron transport layer is not in contact with the second light reflecting pattern.
12. The display substrate of claim 11,
the orthographic projection of the electron injection layer on the substrate base plate is positioned in the orthographic projection of the second electrode on the substrate base plate, the second electrode covers the side surface of the electron injection layer, and the side surface of the electron injection layer is not in contact with the second light reflecting pattern.
13. The display substrate of claim 1, further comprising:
and the light extraction layer is positioned on the light outlet side of the light emitting unit, and the refractive index of the light extraction layer is smaller than that of the substrate base plate.
14. The display substrate of claim 13,
the light extraction layer is of a single-layer structure with the refractive index gradually decreasing along the light extraction direction, and the light extraction direction is the direction of the light extraction layer departing from the organic functional layer; or
The material of the light extraction layer is spherical molecule C70; or
And a plurality of hemispherical microstructures which are arranged in an array are arranged on the surface of one side of the light extraction layer facing the light-emitting unit.
15. A display device comprising the display substrate according to any one of claims 1 to 14.
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| CN202120655341.8U CN216054781U (en) | 2021-03-31 | 2021-03-31 | Display substrate and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952025A (en) * | 2021-03-31 | 2021-06-11 | 京东方科技集团股份有限公司 | Display substrate and display device |
| US12029067B2 (en) | 2021-03-31 | 2024-07-02 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Display substrate and display device |
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2021
- 2021-03-31 CN CN202120655341.8U patent/CN216054781U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952025A (en) * | 2021-03-31 | 2021-06-11 | 京东方科技集团股份有限公司 | Display substrate and display device |
| US12029067B2 (en) | 2021-03-31 | 2024-07-02 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Display substrate and display device |
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