CN221532026U - Display panel and car tail lamp - Google Patents

Display panel and car tail lamp Download PDF

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Publication number
CN221532026U
CN221532026U CN202323190239.3U CN202323190239U CN221532026U CN 221532026 U CN221532026 U CN 221532026U CN 202323190239 U CN202323190239 U CN 202323190239U CN 221532026 U CN221532026 U CN 221532026U
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layer
display panel
cathode
substrate
light
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陈立
高栋雨
安成国
魏振业
王其云
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Abstract

The application provides a display panel and a taillight, wherein the display panel comprises a substrate base plate, an anode, a pixel defining layer, a light emitting unit, a cathode, an insulating layer and an auxiliary cathode. The anodes are arranged on one side of the substrate and are distributed at intervals. The pixel defining layer is arranged on one side of the anode far away from the substrate and comprises a body part and opening parts, wherein the opening parts correspond to the anode one by one and expose at least part of the anode. The pixel defining layer is provided with a light emitting unit and a cathode which are in one-to-one correspondence with the anode on one side far away from the substrate, the light emitting units are red light emitting units, an insulating layer is arranged between the adjacent light emitting units, and orthographic projection of the insulating layer on the substrate is located in the orthographic projection range of the body part on the substrate. The insulating layer has a height between the cathode and the surface of the substrate. The auxiliary cathode is arranged on one side of the insulating layer, which is far away from the substrate, and is at least partially overlapped with the cathode in a side joint manner.

Description

Display panel and car tail lamp
Technical Field
The application relates to the technical field of display, in particular to a display panel and a taillight.
Background
In recent years, an Organic LIGHT EMITTING Diode (OLED) display panel is widely applied to the display field because of advantages of self-luminescence, wide viewing angle, fast response, low power consumption, flexible display and the like, and as OLED products are diversified in application, more and more automobile tail lamps begin to adopt OLED products, and at present, the pixel PPI (Pixels Per Inch) of the automobile-mounted OLED device is low, so that the display brightness of the automobile lamp is affected.
Disclosure of utility model
The embodiment of the application aims to provide a display panel and a taillight, which are used for solving the problem of low pixel opening ratio of the display panel. The specific technical scheme is as follows:
A first aspect of the present application provides a display panel including: the pixel electrode comprises a substrate base plate, an anode, a pixel defining layer, a light emitting unit, a cathode, an insulating layer and an auxiliary cathode. Anodes are arranged on one side of the substrate base plate and are distributed at intervals; the pixel defining layer is arranged on one side of the anode far away from the substrate base plate, and comprises a body part and opening parts, wherein the opening parts are in one-to-one correspondence with the anode and expose at least part of the anode; a light-emitting unit and a cathode which are in one-to-one correspondence with the anode are sequentially arranged on one side, far away from the substrate, of the pixel defining layer, and the light-emitting unit is a red light-emitting unit; the insulation layer is positioned between the adjacent light emitting units, the orthographic projection of the insulation layer on the substrate is positioned in the orthographic projection range of the body part on the substrate, the height of one surface of the insulation layer away from the substrate is lower than the height of one surface of the cathode away from the substrate, and is higher than the height of one surface of the cathode close to the substrate; the auxiliary cathode is arranged on one side, far away from the substrate base plate, of the insulating layer, and the auxiliary cathode is at least partially overlapped with the cathode in a side lap joint mode.
In addition, the display panel provided according to the first aspect of the present application may further have the following technical features:
In some embodiments, the auxiliary cathode has a height higher than the height of the cathode in a direction perpendicular to the substrate base plate, and the auxiliary cathode overlaps the cathode portion side.
In some embodiments, a portion of the auxiliary cathode covers a surface of the cathode such that the auxiliary cathode overlaps under the cathode.
In some embodiments, the orthographic projection of the auxiliary cathode on the substrate is located within the orthographic projection range of the insulating layer on the substrate.
In some embodiments, the first width of the insulating layer is less than 1mm and the second width of the auxiliary cathode is less than 0.2mm in a direction perpendicular to the substrate base.
In some embodiments, the auxiliary cathode has a quadrilateral or irregular shape in cross section along a direction perpendicular to the substrate.
In some embodiments, the auxiliary cathode is rounded or beveled along an edge of a side remote from the substrate base plate.
In some embodiments, the quadrilateral includes a rectangle or trapezoid.
In some embodiments, the insulating layer has a quadrilateral or shaped cross-section along a direction perpendicular to the substrate.
In some embodiments, the display panel includes a plurality of display pixels, each of the display pixels including at least one light emitting unit, a spacing between the display pixels being less than 0.2mm.
In some embodiments, the light emitting unit includes an electron transport layer, a first light emitting material layer, and a hole transport layer disposed in this order, the hole transport layer being located on a side of the first light emitting material layer adjacent to the anode.
In some embodiments, the light emitting unit further includes a second light emitting material layer, the first light emitting material layer and the second light emitting material layer being located between the electron transport layer and the hole transport layer, and a charge generating layer being disposed between the first light emitting material layer and the second light emitting material layer.
In some embodiments, the thicknesses of the first luminescent material layer and the second luminescent material layer are equal or unequal.
In some embodiments, the first luminescent material layer and the second luminescent material layer are red luminescent materials, and Rx > 0.702.
In some embodiments, the display area of the display panel has an aperture ratio of 80% or more, a 2000nit luminance lifetime LT70 of 48000hrs or more at a temperature of 20 ℃ to 30 ℃, and a 2000nit luminance lifetime LT70 of 6500hrs or more at a temperature of 80 ℃ to 90 ℃.
In some embodiments, the cathode includes a first conductive layer that is an elemental metal or alloy; or the cathode comprises a first conductive layer and a second conductive layer, the second conductive layer is arranged close to the substrate, the first conductive layer is simple substance metal or alloy, and the second conductive layer is metal ytterbium.
In some embodiments, the light emitting unit further includes a hole injection layer and a hole blocking layer, the hole injection layer is disposed on a side of the hole transport layer near the anode, the hole blocking layer is disposed on a side of the electron transport layer near the anode, and the charge generation layer includes a negative charge generation layer and a positive charge generation layer; the thickness of the hole injection layer isThe thickness of the hole transport layer isThe thickness of the first luminescent material layer isThe negative charge generating layer has a thickness ofThe positive charge generating layer has a thickness ofThe thickness of the second luminescent material layer isThe thickness of the hole blocking layer isThe thickness of the electron transport layer isThe thickness of the first conductive layer isThe thickness of the second conductive layer is
In some embodiments, the anode is a transparent electrode and the cathode is a reflective electrode.
A second aspect of the present application provides a taillight comprising the display panel described above.
The embodiment of the application has the beneficial effects that:
According to the display panel provided by the embodiment of the application, the light-emitting unit and the cathode are formed through the photoetching process, compared with the traditional vacuum evaporation process, the photoetching process does not need to use a fine metal mask, and the manufacturing precision of the photoetching process is obviously higher than that of evaporation by using the fine metal mask, so that the pixel aperture ratio of the display panel is not limited by the manufacturing precision of the fine metal mask any more, and therefore, the pixel aperture ratio of the display panel is greatly improved. Specifically, the size of the light emitting units can be precisely controlled through a photoetching process, so that the orthographic projection of the insulating layer for separating the adjacent light emitting units on the substrate is positioned in the orthographic projection range of the body part on the substrate, the distance between the adjacent light emitting units is reduced, the pixel opening ratio of the display panel is improved, and the display brightness of the display panel is improved. On the other hand, the use of a fine metal mask is eliminated, so that the process cost for preparing the display panel is obviously reduced.
The insulating layer is located between the surface of the cathode close to the substrate and the surface far from the substrate, so that the insulating layer can completely cover the side surfaces of the light-emitting unit and the cathode, and lateral current is avoided. The height difference between the insulating layer and the cathode ensures that the auxiliary cathode deposited on the cathode can be electrically connected with the cathode through side lap joint without covering the surface of the cathode, thereby being beneficial to reducing the design thickness of the auxiliary cathode and reducing the overall thickness of the display panel.
Of course, it is not necessary for any one product or method of practicing the application to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and other embodiments may be obtained according to these drawings to those skilled in the art.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present application;
FIG. 2 is a schematic diagram showing lifetime evaluation at normal temperature of a display panel manufactured by conventional technique and photolithography technique;
FIG. 3 is a comparative schematic diagram of lifetime evaluation at 85℃of a display panel manufactured by conventional and photolithographic techniques;
FIG. 4 is a diagram showing the temperature rise of a display panel manufactured by the conventional technique and the photolithography technique;
FIG. 5a is a schematic diagram showing another modification of the display panel according to the embodiment of the present application;
FIG. 5b is a schematic diagram showing another modification of the display panel according to the embodiment of the present application;
FIG. 5c is a schematic diagram of another embodiment of a display panel according to the present application;
Fig. 6a is a schematic diagram showing another modification of the insulating layer of the display panel according to the embodiment of the present application;
Fig. 6b is a schematic diagram of another modification of the display panel according to the embodiment of the present application;
fig. 6c is a further modification of the display panel according to the embodiment of the present application;
fig. 7 is a top view of a display panel according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a display panel according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a stacked display panel according to another embodiment of the present application;
FIG. 10 is a schematic diagram of a manufacturing step of a display panel, in which a pixel defining layer, an anode, and a light emitting unit are sequentially formed on a substrate;
FIG. 11 is a schematic diagram showing steps for fabricating a display panel, wherein a cathode is deposited on a light emitting unit;
FIG. 12 shows a schematic diagram of a process for fabricating a panel, depositing photoresist on a cathode;
FIG. 13 is a schematic diagram showing steps for manufacturing a display panel, wherein etching holes are formed by etching the light emitting unit and the cathode;
FIG. 14 is a schematic diagram showing a manufacturing process of the display panel, in which an insulating layer is filled in the etching holes of FIG. 13;
Fig. 15 is a schematic view of a manufacturing step of a display panel, in which an auxiliary cathode is manufactured on an insulating layer.
The reference numerals are as follows:
A substrate base 100; an anode 101; a pixel defining layer 102; a body portion 102a; a light emitting unit 103; a hole injection layer 1031; a hole transport layer 1032; a first luminescent material layer 1033; a negative charge generation layer 1034; a positive charge generation layer 1035; a second luminescent material layer 1036; an electron transport layer 1037; a hole blocking layer 1038; a cathode 104; a first conductive layer 1041; a second conductive layer 1042; a space 105; an insulating layer 106; a first width 1061; an auxiliary cathode 107; a second width 1071; a thin film transistor 200; a photoresist 300; a first portion 301; a second portion 302; display pixel 400; spacing S.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by the person skilled in the art based on the present application are included in the scope of protection of the present application.
A first aspect of the present application provides a display panel, as shown in fig. 1, the display panel including: a substrate 100, an anode 101, a pixel defining layer 102, a light emitting unit 103, a cathode 104, an insulating layer 106, and an auxiliary cathode 107. The anodes 101 are disposed at one side of the substrate 100 and are spaced apart. The pixel defining layer 102 is disposed on a side of the anode 101 away from the substrate 100, and the pixel defining layer 102 includes a body portion 102a and an opening portion, where the opening portion corresponds to the anode 101 one by one, and exposes at least a portion of the anode 101. A light emitting unit 103 and a cathode 104, which are in one-to-one correspondence with the anode 101, are sequentially disposed on a side of the pixel defining layer 102 away from the substrate 100, and the light emitting unit 103 is a red light emitting unit. The insulating layer 106 is located between the adjacent light emitting units 103, the orthographic projection of the insulating layer 106 on the substrate 100 is located in the orthographic projection range of the body portion 102a on the substrate 100, the height of the surface of the insulating layer 106 away from the substrate 100 is lower than the height of the surface of the cathode 104 away from the substrate 100, and is higher than the height of the surface of the cathode 104 close to the substrate 100. The auxiliary cathode 107 is disposed on a side of the insulating layer 106 away from the substrate 100, and the auxiliary cathode 107 is at least partially overlapped with the cathode 104.
Among them, the display panel is a self-luminous display panel, such as an OLED (Organic Light-Emitting Diode) display panel. The display panel includes a driving circuit layer for driving the display device to emit light and a display device layer for emitting light, which are stacked on the substrate 100, the driving circuit layer including a plurality of thin film transistors 200, and the display device layer including a plurality of self-luminous light emitting units 103.
The display device of the display panel comprises individual light emitting units 103 and cathodes 104 which are formed through a photoetching process and are in one-to-one correspondence with the light emitting units 103, an auxiliary cathode 107 is arranged on the upper layer of the cathodes 104, and the auxiliary cathode 107 is used for connecting each display pixel 400 of the display panel, namely each individual light emitting unit 103 and the cathodes 104, in series, so as to ensure that a circuit switch applies a voltage signal to each display pixel 400.
In particular, the light emitting unit 103 and the cathode 104 are formed through a photolithography process, which does not require the use of a fine metal mask compared to a conventional vacuum evaporation process, since the manufacturing accuracy of the photolithography process is significantly higher than that of evaporation using the fine metal mask, the pixel aperture ratio of the display panel is not limited by the manufacturing precision of the fine metal mask, so that the pixel aperture ratio of the display panel is greatly improved. Specifically, the size of the single light emitting unit 103 can be precisely controlled through the photolithography process, so that the orthographic projection of the insulating layer 106 for separating the adjacent light emitting units 103 on the substrate 100 is located in the orthographic projection range of the body portion 102a on the substrate 100, the distance between the adjacent light emitting units 103 is reduced, the pixel aperture ratio of the display panel is improved, and the display brightness of the display panel is improved. On the other hand, the use of a fine metal mask is eliminated, so that the process cost for preparing the display panel is obviously reduced.
The insulating layer 106 may be formed by inkjet printing. The insulating layer 106 is located between the side of the cathode 104 close to the substrate 100 and the side far from the substrate 100 at a height far from the substrate 100, so that the insulating layer 106 can completely cover the side surfaces of the light emitting unit 103 and the cathode 104, avoiding lateral current. The height difference between the insulating layer 106 and the cathode 104 makes the auxiliary cathode 107 deposited on the cathode 104 electrically connected with the cathode 104 through the side lap joint without covering the surface of the cathode 104, thereby being beneficial to reducing the design thickness of the auxiliary cathode 107 and reducing the overall thickness of the display panel.
The red light emitting unit enables the display panel to emit red light, has a warning effect, and can be used as a warning lamp, a taillight and the like.
In some embodiments, the display area of the display panel has an aperture ratio of 80% or more, rx 0.702 or more, and a 2000nit luminance lifetime LT70 of 48000hrs or more at a temperature of 20-30 ℃, and Rx 0.702 or more, and a 2000nit luminance lifetime LT70 of 6500hrs or more at a temperature of 80-90 ℃. Where nit is the intensity of light emitted per unit area of the display screen and the unit of measurement is cd/m 2.
The aperture ratio of the display area is increased, the light-emitting brightness is increased under the condition of unchanged current density, when the light-emitting brightness is set to be rated brightness, such as 2000nit, rx is more than or equal to 0.702 at 20-30 ℃, the brightness life LT70 is more than or equal to 48000hrs, and the brightness life LT70 is greatly improved compared with the brightness life LT70 (about 25000 hrs) of the conventional vacuum evaporation display panel. Similarly, the brightness life LT70 at the temperature of 80-90 ℃ is greatly improved compared with the brightness life LT70 (about 3400 hrs) of the conventional vacuum evaporation display panel.
In a specific embodiment, for a 2.78 inch deep red OLED bottom emission device product, the display brightness is 2000nit, rx=0.702, the display area aperture ratio is increased from 50% to 80%, and the display brightness is increased by 60%, i.e. from 2000nit to 3200nit. As shown in fig. 2, which is a schematic diagram showing a comparison of lifetime curves of 2000nit for the conventional vacuum evaporation technology and the photolithography technology of the present application at normal temperature, it can be seen from fig. 2 that the lifetime of the luminance of the display panel manufactured by the conventional technology, LT 70=25000 hrs, and the lifetime of the luminance of the display panel manufactured by the photolithography technology, LT 70=50000 hrs, i.e. the display panel manufactured by the photolithography technology not only improves the luminance of the display panel, but also prolongs the service life of the display panel. LT70 is the lifetime when the display luminance of the display panel decays to 70% of the initial display luminance.
The pixel aperture ratio is improved, the normal temperature service life and the high temperature reliability of the display panel are obviously improved, and the temperature rise of the product is reduced besides the display brightness of the display panel.
Taking the red light bottom-emitting OLED structure as an example, the product brightness is 2000nit, and the total opening ratio of the display area is approximately equal to 50%, and the normal-temperature (25 ℃) brightness lifetime lt70=25000 hrs. The total opening ratio of the display area can be increased to 80% by photoetching, the normal-temperature brightness life of the display panel is increased by 200%, and the brightness life of the display panel is LT70 = 50000hrs.
Similarly, taking the red bottom-emitting OLED structure as an example, the product brightness is 2000nit, rx=0.702, and the total aperture ratio of the display area is about 50%, and the high-temperature (85 ℃) brightness lifetime lt70=3400 hrs. The total aperture ratio of the display area is increased to 80% by the photolithography process, the luminance lifetime lt70=6800 hrs, the lifetime of Wen Liangdu is increased by 200%, and the comparison result is shown in fig. 3.
The total opening rate of a display area of the display panel prepared by conventional vacuum evaporation is 50%, when the brightness of a product is 2000nit, the current value of a screen body is approximately equal to 230mA, the current density of the display panel is approximately equal to 18mA/cm 2, and the temperature of the screen body is increased by 14 ℃ after the display panel is normally lightened for 1 hrs; the total aperture ratio of the display area of the display panel prepared according to the photoetching technology is approximately equal to 80%, when the display brightness is ensured to be 2000nit, the current value of the screen body is approximately equal to 140mA, the current density of the display panel is reduced to 11mA/cm 2, the temperature of the screen body is increased to less than 10 ℃ after the display panel is normally lightened for 1hrs, and meanwhile, when the current density of the display panel reaches 18mA/cm 2, the display brightness is increased by 60%, namely 3200nit, and the product characteristic contrast is compared with that of the display panel shown in the figure 4.
It will be appreciated that the height of the auxiliary cathode 107 may be flush with the height of the cathode 104 in a direction perpendicular to the substrate 100, with the auxiliary cathode 107 being electrically connected to all sides of the cathode 104. As shown in fig. 1, the auxiliary cathode 107 may be higher than the cathode 104 in height, and the auxiliary cathode 107 is partially overlapped with the cathode 104 in side. The auxiliary cathode 107 has a height higher than that of the cathode 104, so that the thickness of the auxiliary cathode 107 increases, the probability of occurrence of defects such as breakage of the auxiliary cathode 107 is reduced, and the reduction of resistance is facilitated.
Alternatively, as shown in fig. 5a, 5b and 5c, when the height of the auxiliary cathode 107 is higher than that of the cathode 104, a part of the auxiliary cathode 107 covers the surface of the cathode 104, so that the auxiliary cathode 107 overlaps the cathode 104. The auxiliary cathode 107 is overlapped with a part of the cathode 104, and a part of the auxiliary cathode is overlapped with the cathode 104, so that the contact area between the auxiliary cathode 107 and the cathode 104 is increased, the contact resistance is reduced, and the connection stability is improved.
As shown in fig. 1, 5a and 5b, the front projection of the auxiliary cathode 107 on the substrate 100 is located within the front projection range of the insulating layer 106 on the substrate 100. That is, the size of the auxiliary cathode 107 does not exceed the size of the insulating layer 106, and by reducing the size of the auxiliary cathode 107, the occupation of the auxiliary cathode 107 by the effective area where the light emitting unit 103 can be arranged is reduced, and the pixel aperture ratio of the display panel is improved.
Alternatively, as shown in fig. 1, 5a and 5b, the first width 1061 of the insulating layer 106 is less than 1mm, such as the first width 1061 of the insulating layer 106 may be 0.95mm, 0.9mm, 0.85mm, 0.8mm, etc., and the second width 1071 of the auxiliary cathode 107 is less than 0.2mm, such as the second width 1071 of the auxiliary cathode 107 may be 0.18mm, 0.16mm, 0.15mm, etc., in a direction perpendicular to the substrate 100. The size of the auxiliary cathode 107 needs to comprehensively consider factors such as electrical connection stability, manufacturing difficulty and the like.
In some embodiments, the auxiliary cathode 107 has a quadrilateral or shaped cross section along a direction perpendicular to the substrate 100. The trapezium can be a positive trapezium, which means that the upper bottom dimension is smaller than the lower bottom dimension, or a reverse trapezium, which is opposite, and the lower bottom dimension is smaller than the upper bottom dimension. As shown in fig. 1, the auxiliary cathode 107 has a rectangular cross section in a direction perpendicular to the substrate 100. The special-shaped form is, for example, a "T" shape, that is, the auxiliary cathode 107 includes a portion covering the surface of the cathode 104 in addition to a portion located between the adjacent light emitting units 103, and the "T" shape according to the present application is not strictly a "T" shape, but is distributed close to a "T" shape. As shown in fig. 5a, 5b and 5c, the auxiliary cathode 107 has a special shape.
Optionally, the auxiliary cathode 107 is rounded or beveled along the corner of the side remote from the substrate 100, as shown in fig. 5b, the auxiliary cathode 107 is rounded along the corner of the side remote from the substrate 100. The side of the auxiliary cathode 107 far away from the substrate 100 can reduce the climbing difficulty in the subsequent film deposition process, reduce the risk of climbing fracture of the subsequent film at the edges and corners, and improve the yield of the display panel.
Similarly, the insulating layer 106 may have a quadrangular or irregular cross-sectional shape along a direction perpendicular to the substrate 100. The trapezium can be a regular trapezium, an inverted trapezium, etc. The insulating layer 106 has a rectangular cross-sectional shape in a direction perpendicular to the substrate 100 as shown in fig. 6a, the insulating layer 106 has a positive trapezoid cross-sectional shape in a direction perpendicular to the substrate 100 as shown in fig. 1, and the insulating layer 106 has an inverted trapezoid cross-sectional shape in a direction perpendicular to the substrate 100 as shown in fig. 6 c. The special-shaped form such as "T" shape, that is, the auxiliary cathode 107 includes a portion covering the surface of the light emitting unit 103 in addition to a portion located between the adjacent light emitting units 103, and the "T" shape according to the present application is not strictly "T" shape but is distributed close to "T" shape.
The insulating layer 106 is also rounded or beveled along the corner on the side away from the substrate 100, and as shown in fig. 6c, the insulating layer 106 is also rounded along the corner on the side away from the substrate 100. The side of the insulating layer 106, which is far away from the substrate 100, can reduce the climbing difficulty of the auxiliary cathode 107 in the deposition process, reduce the risk of climbing fracture of the auxiliary cathode 107 at the edges and corners, and improve the yield of the display panel.
As shown in fig. 7, the display panel includes a plurality of display pixels 400, each display pixel 400 includes at least one light emitting unit 103, and a space S between the display pixels 400 is less than 0.2mm, such as may be 0.19mm, 0.18mm, 0.17mm, 0.16mm, 0.15mm, and the like. The smaller the space S, the more display pixels 400 can be provided per unit area, which is advantageous for improving the brightness of the display panel. The spacing S between the display pixels 400 of the display panel manufactured by conventional vacuum evaporation is about 1.0mm, and the manufacturing of the light emitting unit 103 and the cathode 104 by the photolithography technique significantly reduces the spacing S between the display pixels 400.
For a monochrome display panel, one light emitting unit 103 is one display pixel 400, and thus the space S between the display pixels 400 is the distance between the light emitting units 103.
In some embodiments, as shown in fig. 1, 5 a-5 c, and 6 a-6 c, the light emitting unit 103 includes an electron transport layer (Electron Transport Layer, ETL) 1037, a first light emitting material layer (EMITTING LAYER, EML) 1033, and a hole transport layer (Hole Transport Layer, HTL) 1032 disposed in that order, the hole transport layer 1032 being located on a side near the anode 101.
Since the electron transport layer 1037, the first light emitting material layer 1033, and the hole transport layer 1032 are sequentially provided, the hole transport layer 1032 is provided near the anode 101 side, and the electron transport layer 1037 is provided near the cathode 104 side. When a current is applied, electrons are injected into the cathode 104 and holes are formed at the anode 101. The electrons and holes will move toward each other through the layers and eventually meet and combine at the light emitting layer, releasing energy in the form of photons. This process occurs rapidly without interruption as current passes, thereby causing continuous light emission.
In some embodiments, as shown in fig. 8, the light emitting unit 103 further includes a second light emitting material layer 1036, the first light emitting material layer 1033 and the second light emitting material layer 1036 are located between the electron transport layer 1037 and the hole transport layer 1032, and a charge generating layer (Charge Generation Layer, CGL) is provided between the first light emitting material layer 1033 and the second light emitting material layer 1036. Specifically, the charge Generation Layer includes a positive charge Generation Layer (Positive Charge Generation Layer, PCGL) 1035 and a negative charge Generation Layer (NEGATIVE CHARGE Generation Layer, NCGL) 1034.
In this embodiment, the light emitting unit 103 includes two layers of light emitting materials for improving the light emitting luminance of the display panel. For rated luminous brightness, the luminous brightness of each layer of luminous material can be reduced by arranging two layers of luminous materials, so that each layer of luminous material emits light under the condition of lower than limit brightness, and the purpose of prolonging the service life of the luminous material is achieved.
Wherein the thicknesses of the first and second light emitting material layers 1033 and 1036 may be equal. The thickness of the two layers of luminescent materials is equal, so that the luminescent brightness of the two layers of luminescent materials is consistent, and the two layers of luminescent materials can be adjusted to the optimal luminescent brightness through the design thickness.
Of course, the thicknesses of the first and second light emitting material layers 1033 and 1036 may also be unequal. The thicknesses of the two layers of luminescent materials are unequal, one of the two layers of luminescent materials can be set as a main luminescent layer, and the other layer of luminescent materials is set as an auxiliary luminescent layer, so that the aim of improving the brightness of the display panel is fulfilled.
Optionally, the first luminescent material layer 1033 and the second luminescent material layer 1036 are red luminescent materials, and the color coordinates Rx > 0.702.
The color coordinates Rx of the first luminescent material layer 1033 and the second luminescent material layer 1036 are greater than 0.702, so that the luminescent color of the display panel is dark red, and the warning effect is improved. At the same time, the color deepens, the wavelength becomes longer, and the light is not easy to scatter in the process of transmission, so that the penetrability of the emitted color light can be improved. When the display panel is used as a display part of the automobile tail lamp, the display panel emits dark red light, the propagation distance is farther, and the safety warning effect is better achieved.
As a specific example, the color coordinate Rx may be 0.708.
In some embodiments, as shown in fig. 8, the anode 101 is a transparent electrode, and may be made of conductive materials such as Indium Tin Oxide (ITO), indium zinc Oxide (Indium Zinc Oxide, IZO); the cathode 104 is an opaque electrode.
In this embodiment, the cathode 104 is used as a reflective electrode, and the anode 101 is used as a light emitting side, i.e., the display panel is a bottom emission display panel. The structure of the bottom emission display panel may be simpler than that of the top emission display panel.
As shown in fig. 8, the cathode 104 includes a first conductive layer 1041, and the first conductive layer 1041 is an elemental metal or an alloy; or the cathode 104 includes a first conductive layer 1041 and a second conductive layer 1042, the second conductive layer 1042 is disposed near the substrate 100, the first conductive layer 1041 is simple metal or alloy, and the second conductive layer 1042 is ytterbium.
The cathode 104 may be composed of only one conductive layer or may be composed of two conductive layers. When there is only one conductive layer, the conductive layer may be an elemental metal such as aluminum, copper, gold, silver, or the like, or an alloy such as magnesium-silver alloy, aluminum alloy, copper alloy, or the like. When two conductive layers are formed, the second conductive layer 1042 disposed close to the substrate 100 is ytterbium, and the first conductive layer 1041 disposed far from the substrate 100 is elemental metal or alloy, specifically, elemental metal such as aluminum, copper, gold, silver, etc., or alloy such as magnesium-silver alloy, aluminum alloy, copper alloy, etc.
Of course, as shown in fig. 8, the light emitting unit 103 may further include a hole injection layer (Hole Inject Layer, HIL) 1031 and a hole blocking layer (Hole Blocking Layer, HBL) 1038, where the hole injection layer 1031 is located on a side of the hole transport layer 1032 near the anode 101, and the hole blocking layer 1038 is located on a side of the electron transport layer 1037 near the anode 101. The hole injection layer 1031 has a thickness ofThe hole transport layer 1037 has a thickness ofThe first luminescent material layer 1033 has a thickness ofThe thickness of the negative charge generation layer 1034 isThe positive charge generation layer 1035 has a thickness ofThe second luminescent material layer 1036 has a thickness ofThe hole blocking layer 1038 has a thickness ofThe electron transport layer 1037 has a thickness ofThe first conductive layer 1041 has a thickness ofThe second conductive layer 1042 has a thickness of
The hole injection layer 1031 is introduced between the anode 101 and the first light emitting material layer 1033, and the hole injection layer 1031 can reduce the energy barrier for injecting holes from the anode 101 into the first light emitting material layer 1033. The hole blocking layer 1038 is provided between the second light emitting material layer 1036 and the electron transporting layer 1037, so that the electron collection rate at the interface can be significantly improved, and the hole blocking capability thereof can be enhanced as the thickness thereof increases. In addition, since the hole blocking layer 1038 is thin, for exampleAnd the like, holes can tunnel through the hole blocking layer 1038 with a thinner thickness under the action of an electric field, so that the electron transmission rate can be improved, the service life of the OLED device can be prolonged, and the OLED device is an indispensable product.
The cathode 104 is composed of two conductive layers, and the first conductive layer 1041 has a relatively thin thickness, for example, may be And the second conductive layer 1042 has a thicker thickness, such asEtc., the primary function of the first conductive layer is to increase the electron injection rate.
In the present embodiment, the thickness of the first light emitting material layer 1033 and the second light emitting material layer 1036 is in the range ofThe thickness of the two luminescent materials may be equal or unequal. When the bottom emission device only comprises one layer of luminescent material, the structure can be further simplified, as shown in fig. 9, the bottom emission vehicle tail lamp device is designed in a single color, and has a simple structure, and only 7 layers of film layers are stacked, and the thickness is respectively that of the bottom emission vehicle tail lamp deviceHole injection layer 1031, thickness of (a)Hole transport layer 1032 of (a) thicknessRed light emitting layer (RED EMITTING LAYER, REML), thicknessHole blocking layer 1038, thickness ofElectron Transport Layer (ETL) 1037, thicknessFirst conductive layer ytterbium (Yb) 1041, thicknessCathode (CTD) 104 of the device. The ETL may be made of 8-hydroxyquinoline-lithium (8-Hydroxyquinolinolato-lithium, liq).
The embodiment of the application also provides a manufacturing method of the display panel, which is used for manufacturing the display panel and comprises the following steps of:
s100: a substrate base 100 is provided.
S200: a plurality of anodes 101 are formed at one side of the substrate 100 to be spaced apart from each other.
S300: a pixel defining layer 102 is formed on a side of the anode 101 away from the substrate 100, and the pixel defining layer 102 is etched to form a plurality of body portions 102a and opening portions which are alternately arranged, wherein the opening portions are in one-to-one correspondence with the anode 101, and at least a portion of the anode 101 is exposed.
S400: on the side of the pixel defining layer 102 away from the substrate 100, a layer of light emitting cells 103 is evaporated under open mask conditions, as shown in fig. 10.
S500: a cathode 104 is deposited on the side of the light emitting unit 103 away from the substrate 100 under open mask conditions, as shown in fig. 11.
S600: a layer of photoresist 300 is deposited on the side of the cathode 104 remote from the substrate 100, the photoresist 300 covering the cathode 104, as shown in fig. 12.
S700: the photoresist 300 of the first portion 301 is removed by exposure and development, and the photoresist 300 of the second portion 302 remains, and the orthographic projection of the photoresist 300 of the first portion 301 on the substrate 100 is located within the orthographic projection range of the body portion 102a on the substrate 100, as shown in fig. 12.
S800: the cathode 104 and the light emitting units 103 are etched with the photoresist 300 of the second portion 302 as a mask to form etching holes, the etching holes extend to the surface of the body portion 102a away from the substrate 100, and the etching holes form the spaces 105 between adjacent light emitting units 103 and between adjacent cathodes 104, as shown in fig. 13.
S900: the etching holes are filled with the insulating layer 106, and the height of the surface of the insulating layer 106 away from the substrate 100 is lower than the height of the surface of the cathode 104 away from the substrate 100 and higher than the height of the surface of the cathode 104 close to the substrate 100, as shown in fig. 14.
S1000: an auxiliary cathode 107 is formed on a side of the insulating layer 106 remote from the substrate 100, the auxiliary cathode 107 being at least partially located in the etching hole so as to overlap with the cathode 104 side, as shown in fig. 15.
In this embodiment, the driving layer of the thin film transistor 200 of the display panel is prepared by a common photolithography process, which is not described herein. The light emitting units 103 and the cathodes 104 are subjected to full layer deposition under an open mask condition, and then the full layer arrangement of the light emitting units 103 and the cathodes 104 is etched into individual light emitting units 103 and cathodes 104 which are arranged at intervals by adopting a photoetching process. The open mask replaces the fine metal mask, so that the manufacturing cost of the display panel is remarkably reduced. And because the etching precision of the photoetching process is higher, the width of the interval 105 between the adjacent light emitting units 103 and the cathode 104 is smaller than the width of the body part 102a of the pixel defining layer 102, and the pixel opening ratio of the display panel is greatly improved, so that the brightness of the display panel is improved.
A second aspect of the application provides a taillight comprising a display panel as described above. Because the light-emitting unit 103 and the cathode 104 of the display panel of the automobile tail light are prepared by adopting a photoetching process, compared with the traditional vacuum evaporation process, the use of a fine metal mask is omitted, the manufacturing cost of the display panel is obviously reduced, the etching precision of the photoetching process is higher, and the pixel aperture ratio of the display panel is greatly improved, so that the display brightness of the display panel is improved, the service life of a using device can be prolonged, and the user experience is improved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (19)

1. A display panel, the display panel comprising:
A substrate base;
Anodes which are arranged at one side of the substrate and are arranged at intervals;
The pixel defining layer is arranged on one side of the anode, far away from the substrate base plate, and comprises a body part and opening parts, wherein the opening parts are in one-to-one correspondence with the anode, and at least part of the anode is exposed;
A light-emitting unit and a cathode which are in one-to-one correspondence with the anode are sequentially arranged on one side, far away from the substrate, of the pixel defining layer, and the light-emitting unit is a red light-emitting unit;
The insulation layer is positioned between the adjacent light-emitting units, the orthographic projection of the insulation layer on the substrate is positioned in the orthographic projection range of the body part on the substrate, the height of one surface of the insulation layer away from the substrate is lower than the height of one surface of the cathode away from the substrate, and is higher than the height of one surface of the cathode close to the substrate;
And the auxiliary cathode is arranged on one side of the insulating layer, which is far away from the substrate base plate, and is at least partially overlapped with the cathode.
2. The display panel according to claim 1, wherein the auxiliary cathode has a height higher than that of the cathode in a direction perpendicular to the substrate base plate, and the auxiliary cathode is overlapped with the cathode portion side.
3. The display panel of claim 2, wherein a portion of the auxiliary cathode covers a surface of the cathode such that the auxiliary cathode overlaps under the cathode.
4. The display panel of claim 1, wherein the orthographic projection of the auxiliary cathode on the substrate is within the orthographic projection of the insulating layer on the substrate.
5. The display panel of claim 4, wherein a first width of the insulating layer is less than 1mm and a second width of the auxiliary cathode is less than 0.2mm in a direction perpendicular to the substrate.
6. The display panel according to claim 1, wherein the auxiliary cathode has a quadrangular or irregularly shaped cross section in a direction perpendicular to the substrate.
7. The display panel according to claim 6, wherein the auxiliary cathode is rounded or beveled along a corner of a side remote from the substrate base plate.
8. The display panel of claim 6, wherein the quadrangle comprises a rectangle or a trapezoid.
9. The display panel according to any one of claims 1 to 8, wherein the insulating layer has a quadrangular or irregularly shaped cross-sectional shape in a direction perpendicular to the substrate.
10. The display panel according to any one of claims 1-8, wherein the display panel comprises a plurality of display pixels, each comprising at least one light emitting unit, the spacing between the display pixels being less than 0.2mm.
11. The display panel according to any one of claims 1 to 8, wherein the light-emitting unit includes an electron transport layer, a first light-emitting material layer, and a hole transport layer, which are sequentially disposed, the hole transport layer being located at a side of the first light-emitting material layer near the anode.
12. The display panel according to claim 11, wherein the light-emitting unit further comprises a second light-emitting material layer, wherein the first light-emitting material layer and the second light-emitting material layer are located between the electron transport layer and the hole transport layer, and wherein a charge generation layer is provided between the first light-emitting material layer and the second light-emitting material layer.
13. The display panel of claim 12, wherein the first luminescent material layer and the second luminescent material layer are equal or unequal in thickness.
14. The display panel of claim 12, wherein the first luminescent material layer and the second luminescent material layer are red luminescent materials and Rx > 0.702.
15. The display panel according to claim 14, wherein an aperture ratio of a display region of the display panel is 80% or more, a 2000nit luminance lifetime LT70 is 48000hrs or more at a temperature of 20 ℃ to 30 ℃, and a 2000nit luminance lifetime LT70 is 6500hrs or more at a temperature of 80 ℃ to 90 ℃.
16. The display panel of claim 12, wherein the cathode comprises a first conductive layer that is a elemental metal or alloy; or alternatively
The cathode comprises a first conductive layer and a second conductive layer, the second conductive layer is arranged close to the substrate, the first conductive layer is simple substance metal or alloy, and the second conductive layer is metal ytterbium.
17. The display panel according to claim 16, wherein the light-emitting unit further comprises a hole injection layer and a hole blocking layer, wherein the hole injection layer is provided on a side of the hole transport layer close to the anode, the hole blocking layer is provided on a side of the electron transport layer close to the anode, and wherein the charge generation layer comprises a negative charge generation layer and a positive charge generation layer;
The thickness of the hole injection layer is The thickness of the hole transport layer isThe thickness of the first luminescent material layer isThe negative charge generating layer has a thickness ofThe positive charge generating layer has a thickness ofThe thickness of the second luminescent material layer isThe thickness of the hole blocking layer isThe thickness of the electron transport layer isThe thickness of the first conductive layer isThe thickness of the second conductive layer is
18. The display panel according to any one of claims 1-8, wherein the anode is a transparent electrode and the cathode is a reflective electrode.
19. A taillight, characterized in that it comprises a display panel as defined in any one of claims 1-18.
CN202323190239.3U 2023-11-24 2023-11-24 Display panel and car tail lamp Active CN221532026U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202323190239.3U CN221532026U (en) 2023-11-24 2023-11-24 Display panel and car tail lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202323190239.3U CN221532026U (en) 2023-11-24 2023-11-24 Display panel and car tail lamp

Publications (1)

Publication Number Publication Date
CN221532026U true CN221532026U (en) 2024-08-13

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Family Applications (1)

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