CN113793909A

CN113793909A - Display panel and display device

Info

Publication number: CN113793909A
Application number: CN202111063879.0A
Authority: CN
Inventors: 温向敏; 樊燕; 高昊; 韩城
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2021-12-14
Anticipated expiration: 2041-09-10
Also published as: CN113793909B

Abstract

The disclosure relates to a display panel and a display device, and belongs to the technical field of display. The display panel comprises a substrate base plate, a light-emitting functional layer and a light-emitting coupling layer. The substrate base plate is provided with a first surface, the light-emitting function layer and the light-emitting coupling layer are sequentially stacked on the first surface, the light-emitting coupling layer is a structure formed by alternately stacking at least two materials with different refractive indexes, the structure macroscopically shows birefringence anisotropy, and the optical axis of the light-emitting coupling layer is parallel to the first surface. Be applied to vehicle-mounted display with this display panel, can satisfy the horizontal direction luminance decay simultaneously gently, the faster requirement of vertical direction luminance decay to make on the horizontal direction, driver and passenger can see clearly the picture on the vehicle-mounted display screen under great observation visual angle, simultaneously in vertical direction, improve the projection and the reflection of vehicle-mounted display's picture on windshield and rear-view mirror, and then reduce the influence to riding safety.

Description

Display panel and display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

An Organic Light-Emitting Diode (OLED) display device has many advantages of self-luminescence, high brightness, high contrast, fast response speed, wide viewing angle, and the like.

OLED display devices can be used in various fields, and have a problem of excessive luminance degradation for some application fields. For example, when the OLED display device is a vehicle-mounted display, the brightness of the passenger viewing the screen of the vehicle-mounted display at different viewing angles is different, and the brightness is attenuated more the larger the viewing angle is, so that the passenger cannot see the picture on the screen of the vehicle-mounted display clearly. Meanwhile, the picture on the screen of the vehicle-mounted display is easily reflected on a windshield or a rearview mirror, and the brightness of the reflected picture is high, so that trouble is easily caused to a driver, and the riding safety is affected.

Disclosure of Invention

The embodiment of the disclosure provides a display panel and a display device, which can realize the effects of gentle horizontal brightness attenuation and fast vertical brightness attenuation, so that when the display panel is applied to a vehicle-mounted display screen, a driver and passengers can clearly see pictures on the screen of the vehicle-mounted display screen under a large observation visual angle in the horizontal direction, and the projection and reflection of the pictures of the vehicle-mounted display on a windshield and a rearview mirror are improved in the vertical direction, thereby reducing the influence on the riding safety. The technical scheme is as follows:

in one aspect, the present disclosure provides a display panel including: the light-emitting device comprises a substrate base plate, a light-emitting functional layer and a light-emitting coupling layer, wherein the substrate base plate is provided with a first surface; the light-emitting functional layer and the light-emitting coupling layer are sequentially stacked on the first surface; the light-out coupling layer has anisotropy, and an optical axis of the light-out coupling layer is parallel to the first surface.

In an implementation manner of the embodiment of the present disclosure, the light-emitting coupling layers include a plurality of periodic combined sublayers, the periodic combined sublayers are sequentially arranged in a first direction, each combined sublayer includes at least two sub light-emitting coupling layers, refractive indexes of two adjacent sub light-emitting coupling layers are not equal, and the first direction is parallel to an extending direction of the optical axis.

In one implementation manner of the embodiment of the present disclosure, an absolute value of a difference between refractive indexes of two adjacent sub light-out coupling layers ranges from 0.6 to 1.9.

In an implementation manner of the embodiment of the present disclosure, the at least two sub light-out coupling layers include a first sub light-out coupling layer and a second sub light-out coupling layer; the refractive index range of the first sub light-out coupling layer is 1.3-1.7, and the refractive index range of the second sub light-out coupling layer is 1.9-3.3.

In one implementation manner of the embodiment of the present disclosure, the material of the first sub out-coupling layer includes one of the following materials: silica, barium fluoride, tris [2,4, 6-trimethyl-3- (3-pyridyl) phenyl ] borane, and 4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ]; the material of the second sub light-out coupling layer comprises one of the following materials: titanium dioxide, lanthanum titanate, nickel oxide, zinc sulfide, carbon 60, and 3-hexylthiophene.

In one implementation manner of the embodiment of the present disclosure, in the first direction, the width of the sub light-out coupling layer is a first width; the first width is larger than the molecular diameter of the material of any one of the first sub light-out coupling layer and the second sub light-out coupling layer, and the first width is smaller than the wavelength of blue light.

In one implementation of the disclosed embodiment, the first width is in a range of 50 nanometers to 400 nanometers.

In one implementation manner of the embodiment of the present disclosure, in the first direction, a width of the first sub out-coupling layer is equal to a width of the second sub out-coupling layer.

In another aspect, the present disclosure provides a display device, which includes a power supply component and the display panel of any one of the above aspects, wherein the power supply component is used for supplying power to the display panel.

In an implementation manner of the embodiment of the present disclosure, the display device is an on-vehicle display, and an optical axis of the light extraction coupling layer is parallel to a width direction of the automobile.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

in the embodiments of the present disclosure, the light out-coupling layer is used to increase the amount of light exiting from the display panel, thereby increasing the luminous efficiency of the display panel. Because the light-emitting coupling layer has anisotropy, one beam of light is divided into two beams of light to be emitted after being emitted into the light-emitting coupling layer, one beam of light is ordinary light, and the other beam of light is extraordinary light. The propagation velocity of ordinary light in any direction is the same, while the propagation velocity of extraordinary light in the direction extending from the optical axis of the light-outcoupling layer is the largest. The greater the propagation speed of light, the slower the luminance decay speed of the screen of the display panel. The speed of the decay of the brightness of the display panel is slowest in the direction of extension of the optical axis of the light out-coupling layer, so that a reduced degree of brightness decay of the screen in the direction parallel to the optical axis is achieved. The display panel is applied to the vehicle-mounted display, and the refractive index of the light-emitting coupling layer in the vehicle-mounted display in the horizontal direction is smaller than that of the light-emitting coupling layer in the vertical direction. In the embodiment of the disclosure, the smaller the refractive index of the light-emitting coupling layer in a certain direction is, the more gradual the L-decay of the light-emitting coupling layer is; the larger its refractive index, the faster its L-decay. Can satisfy that horizontal direction luminance decay is mild, the faster requirement of vertical direction luminance decay to make on the horizontal direction, driver and passenger can see clearly the picture on the vehicle-mounted display screen under great observation visual angle, simultaneously on vertical direction, improve the projection and the reflection of vehicle-mounted display's picture on windshield and rear-view mirror, and then reduce the influence to taking bus safety.

Drawings

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

Fig. 1 is a schematic structural diagram of a display panel provided in an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view taken along plane A-A of FIG. 1;

FIG. 3 is a partial structural view of the region B in FIG. 2;

fig. 4 is a schematic structural diagram of an optical outcoupling layer provided in the embodiment of the present disclosure;

FIG. 5 is a graph of luminance versus viewing angle provided by an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a display panel provided in an embodiment of the present disclosure;

fig. 7 is a display interface diagram of an in-vehicle display provided in an embodiment of the present disclosure.

Reference numerals:

10. a substrate base plate; 101. a first surface; 20. a light-emitting functional layer; 201. an anode layer; 211. an anode; 202. a hole injection layer; 203. a hole transport layer; 204. a light emitting device; 205. an electron transport layer; 206. an electron injection layer; 207. a cathode layer; 30. a light-emitting coupling layer; 31. combining the sub-layers; 300. a sub light-emitting coupling layer; 301. a first sub light-out coupling layer; 302. a second sub light-out coupling layer; 40. a pixel defining layer; 50. a waterproof oxygen layer; 60. a thin film transistor array layer; 601. an active layer; 602. a gate insulating layer; 603. a gate layer; 604. an insulating layer; 605. a source drain layer; 6051. a source electrode; 6052. a drain electrode; 70. a first planarizing layer; 80. a second planarizing layer; 90. and (7) packaging the layer.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In the optical field, the observation visual angle refers to an included angle between a sight line and a normal line of a screen, and a curve of the brightness of the screen changing along with the observation visual angle is a brightness attenuation (L-decay) curve.

The OLED display device can be applied to various fields, for example, as digital cars and smart cars are developed, a car is generally equipped with a plurality of on-board displays including an instrument panel, a central information display, a rear seat entertainment display, and the like. The vehicular terminal has huge market potential and wide development prospect in China. This has also directly driven the market demand of on-vehicle display, and the car factory is in the vertical direction to on-vehicle display screen simultaneously, and the light that is too high luminance under the large visual angle shines on rear-view mirror and windshield, and the puzzlement problem requirement that causes is also more and more severe.

In the horizontal direction of the vehicle-mounted display screen, because a driver and passengers on the left and right need large visual angles and also have good visual effects, the L-depth of the screen is gentle; in the vertical direction of the vehicle-mounted display screen, people generally watch the vehicle-mounted screen at a small visual angle, and if the brightness at a large visual angle is too high, the vehicle-mounted screen can shine on a rearview mirror and a windshield of a vehicle, so that the trouble of a driver and passengers is caused, and the L-decay of the screen is quicker.

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure. Referring to fig. 1, the display panel comprises a plurality of pixels 1, each pixel 1 comprising a plurality of sub-pixels of different colors, for example each pixel 1 comprising a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B. Each of the sub-pixels includes a pixel circuit and a light emitting device.

Fig. 2 is a cross-sectional view taken along the plane a-a in fig. 1. Referring to fig. 2, the display panel includes: a substrate 10, a light emitting function Layer 20, and a light outcoupling Layer (CPL) 30. The substrate base plate 10 is provided with a first surface 101, the light-emitting function layer 20 and the light-out coupling layer 30 are sequentially laminated on the first surface 101, the light-out coupling layer 30 has anisotropy, and the optical axis of the light-out coupling layer 30 is parallel to the first surface 101.

In the embodiment of the present disclosure, the first surface 101 of the substrate 10 is a surface of the substrate 10 facing the light emitting surface of the display panel.

In the embodiment of the present disclosure, the light-exiting coupling layer 30 has anisotropy, which means that one incident light beam enters the light-exiting coupling layer 30 and two refracted light beams exit from the light-exiting coupling layer 30. This phenomenon may also be referred to as birefringence or, alternatively, birefringence/anisotropy.

Due to the fact that color cast is easily caused to occur on a display picture under the condition of low brightness, when the display panel provided by the embodiment of the disclosure is applied to the vehicle-mounted display, brightness attenuation is reduced, brightness is increased, and the phenomenon of color cast can be improved.

When the display panel provided by the embodiment of the disclosure is applied to the vehicle-mounted display, for the vehicle-mounted display, both the driver and the co-driver are in the squint state when observing the screen of the vehicle-mounted display, and in rare cases, the display panel is in the direct-view state. In the embodiment of the present disclosure, the extending direction of the optical axis is made parallel to the arrangement direction of the driver's seat and the passenger's seat, so that the speed of the attenuation of the screen brightness of the in-vehicle display is minimized in the arrangement direction of the driver and the passenger, and the degree of the brightness attenuation is reduced when the screen of the in-vehicle display is viewed from the perspective of the driver and the passenger, so that the driver and the passenger can see the image on the screen of the in-vehicle display clearly.

For the vehicle-mounted display, in the vertical direction, the brightness of the screen needs to be increased along with the increase of the observation visual angle, so that the problem that the brightness of the screen of the vehicle-mounted display is too high under the large observation visual angle, and the picture of the vehicle-mounted display is reflected on a windshield or a rearview mirror, so that the trouble is caused to the watching and riding safety of passengers is avoided. In the embodiment of the disclosure, in the direction perpendicular to the screen of the vehicle-mounted display, the propagation speed of the extraordinary ray is low, the brightness attenuation of the screen of the vehicle-mounted display is high, and the projection of the picture of the vehicle-mounted display on the windshield or the rearview mirror is reduced.

The display panel provided by the embodiment of the disclosure can also be applied to other electronic products, and is not limited to vehicle-mounted displays.

Fig. 3 is a partial structural view of a region B in fig. 2. Referring to fig. 3, the light-exiting coupling layer 30 includes a plurality of periodic combined sublayers 31, the periodic combined sublayers 31 are sequentially arranged in a first direction a, each combined sublayer 31 includes at least two sub light-exiting coupling layers 300, refractive indexes of two adjacent sub light-exiting coupling layers 300 are not equal, and the first direction a is parallel to an extending direction of the optical axis.

In the disclosed embodiment, the out-coupling layers 30 are arranged as a plurality of periodic combined sublayers 31, each combined sublayer 31 comprising at least two sub out-coupling layers 300. The arrangement of the sub out-coupling layers 300 in each sub-layer 31 is the same, so that the same sub out-coupling layers 300 in each sub-layer 31 can be fabricated in the same layer without fabricating each sub out-coupling layer 300 separately, thereby reducing the number of fabrication steps.

In the embodiments of the present disclosure, the term "same layer" refers to a relationship between layers formed simultaneously in the same step, and when the plurality of sub-outcoupling layers 300 are formed for one or more steps of performing the same patterning process in the same layer material, they are in the same layer. In another example, a plurality of each sub out-coupling layer 300 may be formed in the same layer by performing the step of forming one sub out-coupling layer 300 simultaneously. The term "layer" does not always mean that the thickness of the layer or the layers in a cross-sectional view are the same.

Because the refractive indexes of the two adjacent sub light-out coupling layers 300 are not equal, that is, the light-out coupling layer 30 is made of at least two materials with different refractive indexes, the light-out coupling layer 30 formed by the two materials with different refractive indexes macroscopically shows that the refractive indexes in different directions are different, so that the light-out coupling layer 30 has anisotropy.

Fig. 4 is a schematic structural diagram of an optical outcoupling layer provided in an embodiment of the present disclosure. Referring to fig. 3 and 4, the at least two sub out-coupling layers 300 comprise a first sub out-coupling layer 301 and a second sub out-coupling layer 302.

Therefore, each combined sublayer 31 only comprises two sub light-out coupling layers 300, when in manufacturing, all the first sub light-out coupling layers 301 are manufactured by one-time process, all the second sub light-out coupling layers 302 are manufactured by one-time process, and the light-out coupling layer 30 can be manufactured by two-time process, so that too many steps are not added, and the convenience is realized.

Referring to fig. 3 and 4, the first sub out-coupling layer 301 and the second sub out-coupling layer 302 are both cuboids. Because first sub light-emitting coupling layer 301 and second sub light-emitting coupling layer 302 all need form through the mode of sculpture, arrange first sub light-emitting coupling layer 301 and second sub light-emitting coupling layer 302 into the cuboid, make things convenient for the pattern design on the mask plate like this, make things convenient for the preparation of rete.

In other implementations, the first sub out-coupling layer 301 and the second sub out-coupling layer 302 may also have other shapes, for example, long strips with bends, and the like, which is not limited in this disclosure.

In the combined sub-layers 31 shown in fig. 3 and 4, one combined sub-layer 31 includes two sub out-coupling layers 300, and in other implementations, one combined sub-layer 31 may include three or more sub out-coupling layers 300.

In the embodiment of the present disclosure, the absolute value of the difference between the refractive indexes of two adjacent sub-light-out-coupling layers 300 ranges from 0.6 to 1.9.

In the embodiment of the present disclosure, the larger the difference between the refractive indexes of two adjacent sub-light-out-coupling layers 300 is, the better the anisotropy of the light-out-coupling layer 30 is. However, the refractive index of the material forming the sub out-coupling layers 300 is limited, and if the refractive index difference between two adjacent sub out-coupling layers 300 is too large, there is no material that can meet the refractive index requirement to form the sub out-coupling layers 300.

Illustratively, the absolute value of the difference between the refractive indexes of two adjacent sub-out-coupling layers 300 is 0.7.

In the embodiment of the present disclosure, the refractive index of the first sub out-coupling layer 301 ranges from 1.3 to 1.7, and the refractive index of the second sub out-coupling layer 302 ranges from 1.9 to 3.3.

The first sub light-out coupling layer 301 and the second sub light-out coupling layer 302 are arranged according to the refractive index range, so that the light-out coupling layer 30 formed by the first sub light-out coupling layer 301 and the second sub light-out coupling layer 302 can be ensured to have anisotropy, and meanwhile, the effect that the light-out coupling layer 30 improves the luminous efficiency of the display panel can also be realized. And the absolute value of the difference between the refractive indexes of two adjacent sub-light-out-coupling layers 300 can be ensured to be in the range of 0.6 to 1.9.

Illustratively, the refractive index of the first sub out-coupling layer 301 is 1.5 and the refractive index of the second sub out-coupling layer 302 is 2.2.

In the embodiment of the present disclosure, the material of the first sub out-coupling layer 301 includes one of the following materials: silicon dioxide (SiO)₂) Barium fluoride (BaF)₂) Tris [2,4, 6-trimethyl-3- (3-pyridyl) phenyl]Borane and 4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline]。

By setting the material of the first sub out-coupling layer 301 to the above material, the refractive index of the first sub out-coupling layer 301 can be ensured to be between 1.3 and 1.7.

Wherein, the Tris [2,4, 6-trimethyl-3- (3-pyridyl) phenyl ] borane can be abbreviated as 3TPYMB, and the English chemical formula of the 3TPYMB is Tris (2,4,6-trimethyl-3- (pyridine-3-yl) phenyl) borane. 4,4' -cyclohexyl-bis [ N, N-bis (4-methylphenyl) aniline ] can be abbreviated as TAPC, and the English chemical formula of TAPC is Di- [4- (N, N-Di-p-tolyl-amino) -phenyl ] cyclohexamine.

In other implementation manners, the first sub light-out coupling layer 301 may also be made of other materials, and only the above refractive index condition is satisfied, which is not limited by the present disclosure.

In the embodiment of the present disclosure, the material of the second sub out-coupling layer 302 includes one of the following materials: titanium dioxide (TiO)₂) Lanthanum titanate (LaTiO)₃) Nickel oxide (NiO), zinc sulfide (ZnS), carbon 60 (C)₆₀) And 3-hexylthiophene.

By providing the material of the second sub out-coupling layer 302 as above, the refractive index of the second sub out-coupling layer 302 can be ensured to be between 1.9 and 3.3.

Wherein, the polymer of the 3-hexylthiophene can be abbreviated as P3HT, and the English chemical formula of P3HT is Poly (3-hexylthiophene-2, 5-diyl).

In other implementations, the second sub light-out coupling layer 302 may be made of other materials, and only the above-mentioned refractive index condition is satisfied, which is not limited by the present disclosure.

In the embodiment of the present disclosure, in the first direction a, the width of the sub out-coupling layer 300 is a first width, the first width is greater than the molecular diameter of the material of any one of the first sub out-coupling layer 301 and the second sub out-coupling layer 302, and the first width is smaller than the wavelength of the blue light. Among the three colors of light of blue, red and green, the wavelength of blue light is the smallest.

The molecular diameter of the material of the sub light-out coupling layer is very small, generally about 20 nanometers, the wavelength range of blue light is 450 to 480 nanometers, the width of the sub light-out coupling layer 300 is arranged in the above range, and the light-out coupling layer 30 formed by the sub light-out coupling layer 300 can have a better refraction effect on light.

Illustratively, the width of the sub out-coupling layer 300 is much smaller than the wavelength of blue light, and the width of the sub out-coupling layer 300 is much larger than the molecular diameter of the material of the out-coupling layer.

Illustratively, the first width ranges from 50 nanometers to 400 nanometers. For example, the first width is 100 nanometers.

As shown in fig. 3 and 4, the combination sub-layer 31 comprises a first sub-out-coupling layer 301 and a second sub-out-coupling layer 302, the width of the first sub-out-coupling layer 301 in the first direction a is denoted by L1, and the width of the second sub-out-coupling layer 302 in the first direction a is denoted by L2. Both L1 and L2 satisfy the above-described condition of the first width D.

In the disclosed embodiments, 0.5L1 ≦ L2 ≦ 1.5L1, or 0.5L2 ≦ L1 ≦ 1.5L 2.

In the embodiment of the present disclosure, in the first direction a, the width L1 of the first sub out-coupling layer 301 is equal to the width L2 of the second sub out-coupling layer 302.

Experiments prove that when the display panel provided by the embodiment of the disclosure is applied to the vehicle-mounted display of an automobile, different brightness attenuation in different directions can be realized. Fig. 5 is a graph of luminance versus viewing angle provided by an embodiment of the present disclosure. The abscissa is angle, i.e. viewing angle, in degrees (°), and the ordinate is luminance in candelas per square meter (cd/m)²). The light-out coupling layer of the conventional device is made of one material, and the refractive index is 1.8; the light-out coupling layer of the experimental example is any one of the light-out coupling layers described above.

Referring to fig. 5, the luminance attenuation curve in the vertical direction (the direction perpendicular to the screen) is faster than the luminance attenuation curve in the horizontal direction (the direction parallel to the screen), so that when the display panel provided by the embodiment of the disclosure is applied to a vehicle-mounted display, the color shift problem in the horizontal direction can be improved, and the puzzling problem that the luminance is too strong at a large angle in the vertical direction can be improved. In the detection process, the detection point is positioned on one side of the display panel and moves along with the detection direction. When the detection direction is the horizontal direction, the detection point has a distance with the display panel, and the detection point moves along the direction parallel to the display panel, and when the detection direction is the vertical direction, the detection point is located at the non-central position of the display panel, and the detection point moves along the direction perpendicular to the display panel. However, no matter what the detection direction is, the detected angle (abscissa in fig. 5) changes when the detection point moves, and the detected angle is an angle between a line connecting the detection point and a midpoint of the display surface of the display panel and a normal line of the display surface.

The following explains the principle of birefringence of the light-coupling layer in the embodiments of the present disclosure:

the light is electromagnetic wave, and the vibration direction of the electric vector of the light is vertical to the propagation direction, namely the light is transverse wave. Through the design of the micro-nano structure (namely the light extraction coupling layer provided by the embodiment of the disclosure), the isotropic film layer structure is alternately superposed, and the macroscopic property shown by the isotropic film layer structure is birefringence/anisotropy. The thickness of the first sub light-out coupling layer 301 is L₁The dielectric constant of the first sub light-out coupling layer 301 is epsilon₁The thickness of the second sub-outcoupling layer 302 is L₂The dielectric constant of the second sub light-out coupling layer 302 is epsilon₂。

Then the equivalent dielectric constant of ordinary rays (o rays) is ε_o＝fε₁+(1-f)ε₂The equivalent dielectric constant of extraordinary ray (e-ray) is

Wherein the content of the first and second substances,

the relationship between the refractive index n and the dielectric constant is:

the refractive index n of the ordinary ray can be obtained by substituting the parameters of the material used in the test into the above formula_o1.883, refractive index n of extraordinary ray_e1.753. The refractive indexes of the two beams of light in the light-emitting coupling layer are different, so that the two beams of light are emitted out, and the anisotropy of the light-emitting coupling layer is realized.

Fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure. Referring to fig. 6, the light emitting function Layer 20 includes an anode Layer 201, a Hole Injection Layer (HIL) 202, a Hole Transport Layer (HTL) 203, a light emitting device 204, an Electron Transport Layer (ETL) 205, an Electron Injection Layer (EIL) 206, and a cathode Layer 207, which are sequentially stacked on the substrate 10.

During the operation of the display panel, electrical signals are provided to the anode layer 201 and the cathode layer 207, so that a current flows between the anode layer 201 and the cathode layer 207, and the light emitting device 204 is driven to emit light. The hole injection layer 202 injects holes into the light emitting device 204, the hole transport layer 203 is used for transporting holes and accelerating the moving speed of the holes, the electron injection layer 206 injects electrons into the light emitting device 204, and the electron transport layer 205 is used for transporting electrons and accelerating the moving speed of the electrons, so that the speed of recombination of the electrons and the holes in the light emitting device 204 is increased, and the light emitting efficiency is improved.

The anode layer 201 has an anode 211, the anodes 211 of different sub-pixels are separated from each other, the light emitting devices 204 of different sub-pixels are also separated from each other, the anodes 211 of different sub-pixels are located in the region where the corresponding sub-pixels are located, and the light emitting devices 204 of different sub-pixels are located in the region where the corresponding sub-pixels are located. The light emission luminance of the light emitting device 204 of each sub-pixel may be controlled by controlling the electric signal of the anode 211 of each sub-pixel.

As shown in fig. 6, the display panel includes a Pixel Definition Layer (PDL) 40, the PDL 40 has a plurality of openings 401, the plurality of openings 401 respectively correspond to a plurality of sub-pixels, the anode 211 of each sub-Pixel is located in the corresponding opening 401, and the light emitting device 204 of each sub-Pixel is also located in the corresponding opening 401, that is, the anode 211 and the light emitting device 204 of different sub-pixels are separated from each other by the PDL 40.

In the disclosed embodiment, the refractive index of the hole injection layer 202 ranges from 1.9 to 2.0; the hole transport layer 203 has a refractive index ranging from 1.7 to 1.8; the electron transport layer 205 has a refractive index ranging from 1.7 to 1.8; the electron injection layer 206 has a refractive index ranging from 1.3 to 1.5.

Referring again to fig. 6, the display panel further includes a water and oxygen resistant layer 50, a Thin Film Transistor (TFT) array layer 60, and a first Planarization (PLN) layer 70 sequentially stacked on the substrate base plate 10, wherein the first Planarization layer 70 is located between the Thin Film Transistor array layer 60 and the pixel defining layer 40, and the anode layer 201 and the pixel defining layer 40 are both located on the first Planarization layer 70.

In the embodiment of the present disclosure, the substrate 10 is used to provide support for other films, so as to ensure that the following films can be successfully manufactured.

The base substrate 10 is illustratively a glass substrate or a Polyimide (PI) substrate.

The waterproof oxygen layer 50 can play the roles of buffering and preventing water and oxygen, can protect the thin film transistor in the thin film transistor array layer 60, avoid being corroded by water and oxygen, and ensure that the thin film transistor can normally work.

Illustratively, the water-proof oxide layer 50 is a silicon oxide layer, a silicon nitride layer, or a silicon oxynitride layer, which ensures the insulating effect of the water-proof oxide layer 50 and can separate the thin film transistor array layer 60 from the substrate base plate 10.

In the embodiment of the present disclosure, each pixel in the display panel includes at least two thin film transistors, for example, 7 thin film transistors, the 7 thin film transistors are connected to form a pixel Circuit, the pixel Circuit is connected to an Integrated Circuit (IC), and the pixel Circuit is driven by the IC, so as to provide a current required for light emission to the anode, and further drive the light emission of the light emitting device 204, so that the display panel operates. The thin film transistors included in the plurality of pixels constitute a thin film transistor array layer 60.

In the embodiment of the present disclosure, the first planarization layer 70 may make the display panel more flat, and the anode layer 201 and the pixel defining layer 40 are easily disposed. The first planarizing layer 70 may be a Resin (Resin) layer, and the Resin has an insulating property, which ensures the insulating property of the first planarizing layer 70.

In the disclosed embodiment, the anode layer 201 may be an Indium Tin Oxide (ITO) layer or a metal layer. The stability of the electrical signal transmission of the anode layer 201 is ensured. The resistivity of the metal is small, so that the anode layer 201 is prevented from consuming more electric energy; the indium tin oxide has good transparency, and can improve the aperture opening ratio of the display panel.

In the disclosed embodiment, the cathode layer 207 may be an indium tin oxide layer or a metal layer. The stability of the electrical signal transmission of the cathode layer 207 is ensured. The materials of anode layer 201 and cathode layer 207 may be the same or different. For example, the anode layer 201 is an indium tin oxide layer and the cathode layer 207 is a metal layer.

Referring again to fig. 6, the thin film transistor array layer 60 includes an Active (Act) layer 601, a Gate Insulator (GI) layer 602, a Gate (Gate) layer 603, an Insulator (PVX) layer 604, and a Source Drain (SD) layer 605, which are sequentially stacked on the base substrate 10. The thin film transistor array layer 60 shown in fig. 6 shows only one of the thin film transistors for simplicity.

The film layer structure of the thin film transistor array layer 60 shown in fig. 6 is only an example, and in other implementations, the thin film transistor array layer 60 may also be another film layer structure, for example, having two gate layers, etc.

In the structure shown in fig. 6, the gate insulating layer 602 is located between the active layer 601 and the gate layer 603, and the active layer 601 and the gate layer 603 are separated by the gate insulating layer 602, so that the active layer 601 and the gate layer 603 are separated from each other to independently transmit signals. The insulating layer 604 is disposed between the gate layer 603 and the source drain layer 605, so as to ensure independent signal transmission between the gate layer 603 and the source drain layer 605. The first planarization layer 70 is disposed between the source/drain layer 605 and the anode layer 201, so that the display panel with the source/drain layer 605 is more flat, and the anode layer 201 and the pixel defining layer 40 are convenient to manufacture.

Illustratively, the active layer 601 may be a Low Temperature Polysilicon (LTPS) layer. The LTPS has high mobility and good stability, and can meet the requirements of high-resolution displays.

Illustratively, the gate insulating layer 602 may be an inorganic insulating layer, such as a silicon nitride (SiN) insulating layer, or an organic insulating layer, such as an annular resin insulating layer. The insulation between the silicon nitride and the ring-shaped resin is good, and the insulation of the gate insulating layer 602 is ensured.

Illustratively, the insulating layer 604 may be an inorganic insulating layer, such as a silicon nitride insulating layer, or an organic insulating layer, such as a ring-shaped resin insulating layer. The insulation of silicon nitride and the ring-shaped resin is good, and the insulation of the insulating layer 604 is ensured.

Illustratively, the gate layer 603 may be a metal layer or an ito layer. The stability of the electrical signal transmission of the gate layer 603 is ensured.

Illustratively, source drain layer 605 may be a metal layer or an ito layer. The stability of the electrical signal transmission of the source drain layer 605 is ensured.

Here, the anode in the anode layer 201 is electrically connected to the source 6051 or the drain 6052 in the source/drain layer 605 in the thin film transistor array layer 60, respectively, so that the thin film transistor can input an electrical signal to the anode.

Referring again to fig. 6, the display panel further includes a second planarization layer 80 and an encapsulation layer 90. The second planarization layer 80 is located on the cathode layer 207, so that the display panel is more flat, and the second planarization layer 80 covers the cathode layer 207, thereby preventing the cathode layer 207 from generating wrong electrical signal transmission. The encapsulation layer 90 is disposed on the second planarization layer 80, and the encapsulation layer 90 encapsulates the display panel to protect the internal structure of the display panel.

For example, the second planarizing layer 80 may be a resin layer, and the resin has an insulating property, which ensures the insulating property of the second planarizing layer 80.

For example, the Encapsulation may be performed by a Thin-Film Encapsulation (TFE) method, so as to ensure the Encapsulation effect.

The embodiment of the disclosure also provides a display device, which comprises a power supply assembly and a display panel, wherein the power supply assembly is used for supplying power to the display panel.

In the embodiment of the present disclosure, the display device may be an Organic Light-Emitting Diode (OLED) display device or a Quantum Dot Light-Emitting Diode (QLED) display device.

In specific implementation, the display device provided in the embodiments of the present disclosure may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator.

Fig. 7 is a display interface diagram of an in-vehicle display provided in an embodiment of the present disclosure. Referring to fig. 7, the display interface of the on-board display displays time, speed and other parameters of the vehicle during driving, and fig. 7 does not fully show the time, speed and other parameters. The extending direction a of the optical axis of the light-emitting coupling layer is parallel to the width direction of the automobile, so that the brightness attenuation of the vehicle-mounted display is minimum in the extending direction a of the optical axis of the light-emitting coupling layer, and when a passenger observes the screen of the vehicle-mounted display under a larger observation visual angle, the passenger still can clearly see the picture on the screen of the vehicle-mounted display.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A display panel, comprising: a substrate base plate (10), a light-emitting functional layer (20) and an optical coupling layer (30),

the base substrate (10) has a first surface (101); the light-emitting functional layer (20) and the light-out coupling layer (30) are sequentially laminated on the first surface (101);

the out-coupling layer (30) has an anisotropy, and an optical axis of the out-coupling layer (30) is parallel to the first surface (101).

2. The display panel according to claim 1, wherein the light extraction coupling layer (30) comprises a plurality of periodic combination sub-layers (31), the periodic combination sub-layers (31) are sequentially arranged in a first direction, each combination sub-layer (31) comprises at least two sub light extraction coupling layers (300), refractive indexes of two adjacent sub light extraction coupling layers (300) are not equal, and the first direction is parallel to an extending direction of the optical axis.

3. A display panel according to claim 2, wherein the absolute value of the difference between the refractive indices of two adjacent sub-outcoupling layers (300) is in the range of 0.6 to 1.9.

4. A display panel as claimed in claim 2 characterized in that the at least two sub out-coupling layers (300) comprise a first sub out-coupling layer (301) and a second sub out-coupling layer (302);

the refractive index range of the first sub out-coupling layer (301) is 1.3 to 1.7, and the refractive index range of the second sub out-coupling layer (302) is 1.9 to 3.3.

5. A display panel as claimed in claim 4 wherein the material of the first sub out-coupling layer (301) comprises one of the following materials:

silica, barium fluoride, tris [2,4, 6-trimethyl-3- (3-pyridyl) phenyl ] borane, and 4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ];

the material of the second sub out-coupling layer (302) comprises one of the following materials:

titanium dioxide, lanthanum titanate, nickel oxide, zinc sulfide, carbon 60, and 3-hexylthiophene.

6. A display panel as claimed in claim 4 characterized in that the width of the sub out-coupling layer (300) in the first direction is a first width;

the first width is larger than the molecular diameter of the material of any one of the first sub light-out coupling layer (301) and the second sub light-out coupling layer (302), and the first width is smaller than the wavelength of blue light.

7. The display panel of claim 6, wherein the first width is in a range of 50 nm to 400 nm.

8. A display panel as claimed in claim 6 characterized in that the width of the first sub out-coupling layer (301) is equal to the width of the second sub out-coupling layer (302) in the first direction.

9. A display device, characterized in that the display device comprises a power supply component and a display panel according to any one of claims 1 to 8, the power supply component being configured to supply power to the display panel.

10. The display device according to claim 9, wherein the display device is an in-vehicle display, and the optical axis of the light-out coupling layer is parallel to the width direction of the vehicle.