CN113193029A - OLED display panel, display device and preparation method - Google Patents
OLED display panel, display device and preparation method Download PDFInfo
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- CN113193029A CN113193029A CN202110468035.8A CN202110468035A CN113193029A CN 113193029 A CN113193029 A CN 113193029A CN 202110468035 A CN202110468035 A CN 202110468035A CN 113193029 A CN113193029 A CN 113193029A
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/128—Active-matrix OLED [AMOLED] displays comprising two independent displays, e.g. for emitting information from two major sides of the display
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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Abstract
The invention provides an OLED display panel, a display device and a preparation method. The display panel comprises a transparent substrate, a plurality of first pixel repeating units and a plurality of second pixel repeating units, wherein the plurality of first pixel repeating units and the plurality of second pixel repeating units are arranged on the transparent substrate and are distributed on the transparent substrate at intervals; the first pixel repeating unit comprises at least one OLED light-emitting unit and is used for emitting light rays in the direction away from the transparent substrate; the second pixel repeating unit comprises at least one OLED light-emitting unit, is used for emitting light to the direction away from the transparent substrate and is also used for emitting light to the direction towards the transparent substrate, and the emitted light can penetrate through the transparent substrate. Through setting up a plurality of pixel structures on same transparent substrate, can realize two-sided image display, can reduce a display panel compared with conventional two-sided display structure, consequently can satisfy the requirement of frivolousization and cost reduction.
Description
Technical Field
The invention relates to the technical field of display, in particular to an OLED display panel, a display device and a preparation method.
Background
An Organic Light Emitting Diode (OLED) Display device has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, a viewing angle of approximately 180 °, a wide temperature range, flexible Display, large-area full-color Display, and the like, and is considered as a Display device with the most potential development in the industry.
Based on the current market demand, the double-sided organic light emitting diode OLED display has come to the end, and the double-sided OLED display not only has various characteristics of a common OLED display, but also can extend the picture space, and rapidly switches and processes a plurality of display pictures, so that the manufacturing cost of the display is saved, and the space of the device can be saved.
The existing double-sided OLED display screen structure generally comprises two display panels, and double-sided display is realized by the two display panels in a pasting mode, but the display device has the problems of high cost, difficulty in thickness reduction and heavier weight, so that the pixel arrangement for realizing double-sided display becomes an important solution of the display panels.
Disclosure of Invention
The invention aims to provide an OLED display panel, a display device and a preparation method.
The embodiment of the invention provides an OLED display panel, which comprises a transparent substrate, a plurality of first pixel repeating units and a plurality of second pixel repeating units, wherein the plurality of first pixel repeating units and the plurality of second pixel repeating units are arranged on the transparent substrate and are distributed on the transparent substrate at intervals;
the first pixel repeating unit comprises at least one OLED light-emitting unit and is used for emitting light rays in a direction away from the transparent substrate;
the second pixel repeating unit comprises at least one OLED light-emitting unit, is used for emitting light in a direction away from the transparent substrate and is also used for emitting light in a direction towards the transparent substrate, and the emitted light can penetrate through the transparent substrate.
Optionally, the OLED display panel, wherein the first pixel repeating unit includes at least two first OLED light emitting units, and the at least two first OLED light emitting units are configured to emit light of different colors;
the second pixel repeating unit comprises at least two second OLED light-emitting units, and the at least two second OLED light-emitting units are used for emitting light rays with different colors.
Optionally, in the OLED display panel, on the transparent substrate, a plurality of the first pixel repeating units are sequentially connected along a first direction to form a first region, and a plurality of the second pixel repeating units are sequentially connected along the first direction to form a second region;
wherein, along a second direction, the first region and the second region are arranged at intervals; the first direction is perpendicular to the second direction.
Optionally, the OLED display panel, wherein the plurality of first pixel repeating units and the plurality of second pixel repeating units are respectively disposed at intervals along a first direction and a second direction perpendicular to each other on the transparent substrate.
Optionally, in the OLED display panel, in the OLED light emitting unit included in at least one of the first pixel repeating unit and the second pixel repeating unit, a light emitting area of each OLED light emitting unit is a quadrangle, and light emitting areas of at least two first OLED light emitting units are combined to form a quadrangle.
Optionally, in the OLED display panel, at least one of the first pixel repeating unit and the second pixel repeating unit includes an OLED light emitting unit, wherein a light emitting shape and a light emitting area of the OLED light emitting unit for emitting the emission light of the first color are different from a light emitting shape and a light emitting area of the OLED light emitting unit for emitting the emission light of the second color.
Optionally, the OLED display panel, wherein the first pixel repeating unit includes a first pixel repeating unit of a first type and a first pixel repeating unit of a second type, and a color of light emitted by the OLED light emitting unit in the first pixel repeating unit of the first type is different from a color of light emitted by the OLED light emitting unit in the first pixel repeating unit of the second type;
the first pixel repeating units of the first type and the first pixel repeating units of the second type are respectively distributed among the second pixel repeating units.
Optionally, the OLED display panel, wherein the OLED light emitting unit emitting the first color in the first pixel repeating unit is adjacent to the OLED light emitting unit emitting the first color in the second pixel repeating unit.
Optionally, the OLED display panel, wherein a first OLED light-emitting unit in the first pixel repeating unit is adjacent to a second OLED light-emitting unit and a third OLED light-emitting unit in the second pixel repeating unit, respectively, and the first OLED light-emitting unit, the second OLED light-emitting unit, and the third OLED light-emitting unit are configured to emit light of different colors, respectively.
Optionally, the OLED display panel, wherein the OLED light emitting unit in the first pixel repeating unit includes a top-emission type OLED light emitting device, and the OLED light emitting unit in the second pixel repeating unit includes a dual-emission type OLED light emitting device.
Optionally, the OLED display panel, wherein the OLED light emitting unit in the first pixel repeating unit includes a first anode, a first cathode, and a first light emitting layer between the first anode and the first cathode; the OLED light emitting unit in the second pixel repeating unit comprises a second anode, a second cathode and a second light emitting layer positioned between the second anode and the second cathode;
the first anode and the second anode are made of different materials on the same layer, the first light-emitting layer and the second light-emitting layer, and the first cathode and the second cathode are respectively made of the same material on the same layer, and the first cathode, the second anode and the second cathode are all transparent electrodes.
Optionally, the OLED display panel, wherein the first anode is made of an indium tin oxide ITO/silver Ag/ITO stacked structure, and the second anode is made of indium tin oxide ITO.
Optionally, the OLED display panel, wherein the first pixel repeating unit and the second pixel repeating unit further include a thin film transistor for driving each OLED light emitting unit to emit light, respectively;
the thin film transistor of the first pixel repeating unit comprises a first active layer, a first grid electrode and a first source/drain electrode, the first source/drain electrode is connected with the first anode electrode, and the orthographic projection of the first light-emitting layer on the plane of the first source/drain electrode is overlapped with the first source/drain electrode;
the thin film transistor of the second pixel repeating unit includes a second active layer, a second gate electrode, and a second source/drain electrode connected to the second anode electrode;
the first active layer and the second active layer, the first grid electrode and the second grid electrode, and the first source/drain electrode and the second source/drain electrode are respectively arranged on the same layer and the same material.
The embodiment of the invention also provides a display device, which comprises the OLED display panel.
The embodiment of the invention also provides a preparation method of the OLED display panel, wherein the preparation method comprises the following steps:
providing a transparent substrate;
preparing a plurality of first pixel repeating units and a plurality of second pixel repeating units on the transparent substrate;
the first pixel repeating unit comprises at least one OLED light-emitting unit and is used for emitting light rays in a direction away from the transparent substrate; the second pixel repeating unit comprises at least one OLED light-emitting unit, is used for emitting light in a direction away from the transparent substrate and is also used for emitting light in a direction towards the transparent substrate, and the emitted light can penetrate through the transparent substrate.
Optionally, the method for preparing includes forming a first pixel repeating unit by a first Organic Light Emitting Diode (OLED), wherein the OLED comprises a first anode, a first cathode, and a first light emitting layer between the first anode and the first cathode; the OLED light emitting unit in the second pixel repeating unit includes a second anode, a second cathode, and a second light emitting layer between the second anode and the second cathode, wherein a plurality of first pixel repeating units and a plurality of second pixel repeating units are prepared on the transparent substrate, including:
forming the first anode and the second anode through a double patterning process;
forming the first light emitting layer and the second light emitting layer through the same patterning process;
the first cathode and the second cathode are formed through the same patterning process.
At least one of the above technical solutions of the specific embodiment of the present invention has the following beneficial effects:
by adopting the OLED display panel provided by the embodiment of the invention, the first pixel repeating units and the second pixel repeating units are manufactured on the same transparent substrate to realize double-sided display, and compared with a conventional double-sided display structure, one display panel can be reduced, so that the requirements of light weight, thinness and cost reduction can be met.
Drawings
FIG. 1 is a schematic cross-sectional view of an OLED display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a planar structure of a first pixel repeating unit according to one embodiment;
FIG. 3 is a schematic diagram of a second pixel repeating unit according to one embodiment;
FIG. 4 is a schematic plan view illustrating an OLED display panel according to an embodiment of the present invention;
FIG. 5 is a second schematic plan view illustrating an OLED display panel according to an embodiment of the present invention;
FIG. 6 is a schematic plan view of a first pixel repeating unit or a second pixel repeating unit according to one embodiment;
FIG. 7 is a third schematic plan view illustrating an OLED display panel according to the present invention;
FIG. 8 is a fourth schematic plan view illustrating an OLED display panel according to an embodiment of the present invention;
fig. 9 is a schematic flow chart of a method for manufacturing an OLED display panel according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
In order to solve the problem that two OLED display panels are generally adopted to realize double-sided display in the prior art in a pasting mode, and a display device manufactured in the mode has the defects of high cost, difficulty in thickness reduction and bulkiness, the embodiment of the invention provides the OLED display panel, and double-sided image display can be realized through a plurality of pixel structures arranged on the same transparent substrate.
Specifically, as shown in fig. 1, the OLED display panel according to the embodiment of the present invention includes a transparent substrate 1, and a plurality of first pixel repeating units 100 and a plurality of second pixel repeating units 200 disposed on the transparent substrate 1, where the plurality of first pixel repeating units 100 and the plurality of second pixel repeating units 200 are distributed on the transparent substrate 1 at intervals;
the first pixel repeating unit 100 includes at least one OLED light emitting unit for emitting light in a direction away from the transparent substrate 1;
the second pixel repeating unit 200 includes at least one OLED light emitting unit for emitting light in a direction away from the transparent substrate 1, and also for emitting light in a direction toward the transparent substrate 1, and the emitted light can penetrate through the transparent substrate 1.
With the OLED display panel of this embodiment structure, the plurality of first pixel repeating units 100 and the plurality of second pixel repeating units 200 fabricated on the transparent substrate 1 are each capable of emitting light in a direction away from the transparent substrate 1, and thus image display in a forward direction (a direction toward the transparent substrate 1) of the transparent substrate 1 is achieved by the combination of the plurality of first pixel repeating units 100 and the plurality of second pixel repeating units 200; since the plurality of second pixel repeating units 200 can emit light in a direction toward the transparent substrate, image display in a reverse direction (a direction away from the transparent substrate 1) of the transparent substrate 1 can be realized by the plurality of second pixel repeating units 200. Therefore, with the implementation structure, the OLED display panel according to the embodiment of the present invention can implement double-sided image display by using a plurality of pixel structures disposed on the same transparent substrate.
Alternatively, the transparent substrate 1 is one of a glass substrate and a flexible substrate.
The OLED display panel according to the embodiment of the present invention can manufacture a plurality of first pixel repeating units 100 and a plurality of second pixel repeating units 200 on the same transparent substrate 1 to implement double-sided display, and compared with a conventional double-sided display structure, one display panel can be reduced, so that the requirements of light weight, thinness, and cost reduction can be satisfied.
Alternatively, the OLED light emitting unit in the first pixel repeating unit 100 includes a top-emission type OLED light emitting device, and the OLED light emitting unit in the second pixel repeating unit 200 includes a dual-emission type OLED light emitting device.
In the OLED display panel according to the embodiment of the present invention, the OLED light emitting units in the first pixel repeating unit 100 and the second pixel repeating unit 200 respectively include an OLED light emitting device and a thin film transistor, where the thin film transistor is used for driving the OLED light emitting device to emit light for image display.
The OLED light-emitting device includes an anode, a cathode, and a light-emitting layer located between the anode and the cathode, where the light-emitting layer includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer, which are sequentially disposed. The light-emitting layer can emit light by a voltage difference between the anode and the cathode. In the embodiment of the invention, the anode and the cathode in the OLED light-emitting unit are made of light-transmitting materials or light-reflecting materials, so that the emergent direction of light emitted by the light-emitting layer is controlled, and the image display of the OLED display panel on two surfaces is realized.
As shown in fig. 1, the first pixel repeating unit 100 includes at least two first OLED light emitting units including a top-emission type OLED light emitting device, and specifically, the first OLED light emitting unit includes a first anode 111, a first light emitting layer 112, and a first cathode 113, which are sequentially disposed from a direction close to the transparent substrate 1 to a direction far from the transparent substrate 1; wherein the first anode 111 is made of a light-reflecting anode material, such as a stacked material of ITO/Ag/ITO, and the first cathode 113 is made of a light-transmitting cathode material, i.e., the first cathode 113 is a transparent electrode, such as a material including at least one of Mg and Ag, and is formed as a top-emission OLED light emitting device for emitting light in a direction away from the transparent substrate 1.
The second pixel repeating unit 200 includes at least two second OLED light emitting units including a dual emission type OLED light emitting device therein. Specifically, the second OLED light emitting unit includes a second anode 211, a second light emitting layer 212, and a second cathode 213, which are sequentially disposed in a direction from being close to the transparent substrate 1 to being far from the transparent substrate 1. The second anode 211 is made of an anode material with high light transmittance, that is, the second anode 211 is a transparent electrode, for example, the second anode is made of ITO; the second cathode 213 is also made of a transparent cathode material, i.e. the second cathode 213 is a transparent electrode, e.g. made of a material including at least one of Mg and Ag. In this way, light emitted from the second light emitting layer 212 can be transmitted in both directions, and is emitted through the second anode 211 and the second cathode 213, respectively, to form a bidirectional emission type OLED light emitting device, which emits light in a direction away from the transparent substrate 1, and also emits light in a direction toward the transparent substrate 1.
With the above-described structure, the first anode 111 and the second anode 211 are made of different materials in the same layer, the first light-emitting layer 112 and the second light-emitting layer 212, and the first cathode 113 and the second cathode 213 are made of the same material in the same layer, and the first cathode 113, the second anode 211, and the second cathode 213 are all transparent electrodes.
In the embodiment of the present invention, the OLED light emitting units in the first pixel repeating unit 100 and the second pixel repeating unit 200 further include thin film transistors for emitting light from the OLED light emitting devices, respectively, and the thin film transistors are disposed between the transparent substrate 1 and the driven OLED light emitting devices. As shown in fig. 1, the first OLED light emitting unit includes a first thin film transistor, and particularly, the first thin film transistor includes a first active layer 114, a first gate electrode 115, and a first source/drain electrode 116 from a direction close to the transparent substrate 1 to a direction away from the transparent substrate 1, wherein the first source/drain electrode 116 is connected to the first anode 111. The second OED light emitting unit includes a second thin film transistor, and particularly, the second thin film transistor includes a second active layer 214, a second gate electrode 215, and a second source/drain electrode 216 from a direction close to the transparent substrate 1 to a direction far from the transparent substrate 1, wherein the second source/drain electrode 216 is connected to the second anode electrode 211.
The first active layer 114 and the second active layer 214, the first gate electrode 115 and the second gate electrode 215, and the first source/drain electrode 116 and the second source/drain electrode 216 are respectively disposed in the same layer and material.
In the embodiment of the present invention, optionally, in the first pixel repeating unit 100, an orthogonal projection of the first light emitting layer 112 on a plane where the first source/drain 116 is located overlaps with the first source/drain 116. By making the arrangement range of the first source/drain 116 correspond to the arrangement range of the first light-emitting layer 112, a light shielding effect is achieved at a side of the first light-emitting layer 112 close to the transparent substrate 1, and light emitted by the first light-emitting layer 112 is prevented from being emitted from the side of the transparent substrate 1, which causes light leakage.
In the display panel according to the embodiment of the invention, in the first pixel repeating unit 100 and the second pixel repeating unit 200, the first light emitting layer 112 and the second light emitting layer 212, the first cathode 113 and the second cathode 213, the first active layer 114 and the second active layer 214, the first gate 115 and the second gate 215, and the first source/drain 116 and the second source/drain 216 are respectively made of the same material in the same layer, and the layers are made of the same material in the same layer, so that the manufacturing process of the OLED display panel can be greatly simplified, and the OLED display panel is thinner.
Alternatively, the thin film transistors in the first pixel repeating unit 100 and the second pixel repeating unit 200 may be LTPS-TFTs, or IGZO-TFTs, respectively, or a part of the thin film transistors may be LTPS-TFTs and a part of the thin film transistors may be IGZO-TFTs, and are not limited thereto.
It should be noted that, in order to ensure sufficient brightness of image display in the opposite direction of the transparent substrate 1 (i.e., the direction away from the transparent substrate 1) in the double-sided display, the driving voltage of the thin film transistor in the second pixel repeating unit 200 may be slightly larger than that of the thin film transistor in the first pixel repeating unit 100.
In the OLED display panel according to the embodiment of the present invention, as shown in fig. 1, the OLED display panel is manufactured by forming a first pixel repeating unit 100 and a second pixel repeating unit 200 on a transparent substrate 1, and specifically includes:
a first thin film transistor of the first pixel repeating unit 100 and a second thin film transistor of the second pixel repeating unit 200 are fabricated on the transparent substrate 1; wherein the first active layer 114 of the first thin film transistor and the second active layer 214 of the second thin film transistor are fabricated on the buffer layer 101;
in addition, the OLED display panels further include first gate insulating layers 102 formed on the buffer layers 101, wherein the first gate electrode 115 of the first thin film transistor and the second gate electrode 215 of the second thin film transistor are formed on the first gate insulating layers 102;
optionally, the OLED display panel may further include a second gate insulating layer (not shown) formed on the first gate insulating layer 102, and optionally, a first electrode plate may be formed on the first gate insulating layer 102, and a second electrode plate (not shown) opposite to the first electrode plate may be formed on the second gate insulating layer to form a storage capacitor;
further, the OLED display panel may further include an interlayer insulating layer 103 formed on the first gate insulating layer 102 (or the second gate insulating layer when the second gate insulating layer is included), wherein the first source/drain electrode 116 of the first thin film transistor and the second source/drain electrode 216 of the second thin film transistor are formed on the interlayer insulating layer 103, and the first source/drain electrode 116 is connected to the first active layer 114 through a via hole penetrating the interlayer insulating layer 103 and the first gate insulating layer 102, and the second source/drain electrode 216 is connected to the second active layer 214 through a via hole penetrating the interlayer insulating layer 103 and the first gate insulating layer 102;
in addition, the OLED display panel further includes a planarization layer 104 formed on the interlayer insulating layer 103, wherein the first anode 111 and the second anode 211 are formed on the planarization layer 104, the first anode 211 penetrates through the via hole of the planarization layer 104 and is connected to the first source/drain 116, and the second anode 211 penetrates through the via hole of the planarization layer 104 and is connected to the second source/drain 216;
further, a pixel defining layer 105 is formed on the planarization layer 104, wherein a first light emitting layer 112 and a second light emitting layer 212 are formed on the pixel defining layer 105, the first light emitting layer 112 penetrates through a via hole of the pixel defining layer 105 and is connected to the first anode 111, and the second light emitting layer 212 penetrates through a via hole of the pixel defining layer 105 and is connected to the second anode 211;
on the basis of the above structure, the first cathode 113 is fabricated on the first light emitting layer 112, the second cathode 213 is fabricated on the second light emitting layer 212, and a PS spacer layer 300 is disposed between the first cathode 113 and the second cathode 213 for separating different OLED light emitting units.
According to the OLED display panel provided by the embodiment of the invention, the first pixel repeating units 100 and the second pixel repeating units 200 of the implementation structure are manufactured on the transparent substrate 1 and are distributed at intervals, so that the pixel distribution uniformity displayed on two display planes during double-sided display can be realized, and the problems of granular sensation and unsmooth property of pixel display during double-sided display are solved.
Specifically, in the OLED display panel according to the embodiment of the present invention, the first pixel repeating unit 100 includes at least two first OLED light emitting units, and the at least two first OLED light emitting units are configured to emit light of different colors;
the second pixel repeating unit 200 includes at least two second OLED light emitting units for emitting different color light.
In one embodiment, as shown in fig. 2, in the first pixel repeating unit 100, at least two first OLED light emitting units are respectively configured to emit light beams with different colors, each first OLED light emitting unit corresponds to one sub-pixel, and one first pixel repeating unit 100 corresponds to one pixel unit. For example, the number of the first OLED light emitting units in the first pixel repeating unit 100 is three, and the first OLED light emitting units correspond to a first blue subpixel 1001, a first red subpixel 1002, and a first green subpixel 1003, respectively; as shown in fig. 3, in the second pixel repeating unit 200, at least two second OLED light emitting units are used for emitting light with different colors, each second OLED light emitting unit corresponds to one sub-pixel, and one second pixel repeating unit 200 corresponds to one pixel unit. For example, the second OLED light emitting units in the second pixel repeating unit 200 are three, and correspond to a second blue subpixel 2001, a second red subpixel 2002, and a second green subpixel 2003, respectively.
In the embodiment of the present invention, in the OLED light emitting unit included in at least one of the first pixel repeating unit 100 and the second pixel repeating unit 200, the light emitting area of each OLED light emitting unit is a quadrangle, and the light emitting areas of at least two first OLED light emitting units are combined to form a quadrangle.
Alternatively, as shown in fig. 2 and 3, the light emitting areas and light emitting areas of the plurality of first OLED light emitting units of the first pixel repeating unit 100 correspond to the same light emitting areas and light emitting areas of the plurality of second OLED light emitting units of the second pixel repeating unit 200, respectively. For example, the light emitting area of each first OLED light emitting unit and the light emitting area of each second OLED light emitting unit are quadrilateral. Correspondingly, the overall light emitting area and the total light emitting area of one first pixel repeating unit 100 formed by combining a plurality of first OLED light emitting units and the overall light emitting area of one second pixel repeating unit 200 formed by combining a plurality of second OLED light emitting units are respectively the same.
Based on the first pixel repeating unit 100 of the implementation structure shown in fig. 2 and the second pixel repeating unit 200 of the implementation structure shown in fig. 3, in an embodiment, optionally, as shown in fig. 4 in combination with fig. 1, on the transparent substrate 1, a plurality of first pixel repeating units 100 are sequentially connected along a first direction a to form a first region 2, and a plurality of second pixel repeating units 200 are sequentially connected along the first direction a to form a second region 3;
wherein, along the second direction b, the first region 2 and the second region 3 are arranged at intervals; the first direction a is perpendicular to the second direction b.
In this embodiment, optionally, the first direction is a vertical direction, and the second direction is a horizontal direction, but is not limited thereto.
With this embodiment, the first regions 2 formed by the plurality of first pixel repeating units 100 and the second regions 3 formed by the plurality of second pixel repeating units 200 are sequentially spaced apart in the row direction or the column direction of the transparent substrate 1.
In another embodiment, based on the first pixel repeating unit 100 of the implementation structure shown in fig. 2 and the second pixel repeating unit 200 of the implementation structure shown in fig. 3, as shown in fig. 5 in combination with fig. 1, a plurality of the first pixel repeating units 100 and a plurality of the second pixel repeating units 200 are respectively disposed at intervals along a first direction a and a second direction b perpendicular to each other on the transparent substrate 1.
With this embodiment, the first pixel repeating units 100 and the second pixel repeating units 200 are arranged at intervals along the row direction and the column direction of the transparent substrate 1, and the first pixel repeating units 100 and the second pixel repeating units 200 are respectively uniformly arranged, so that compared with the previous embodiment, the brightness uniformity on two display planes during double-sided display can be ensured.
In another embodiment, at least one of the first pixel repeating unit 100 and the second pixel repeating unit 200 includes an OLED light emitting unit in which a light emitting shape and a light emitting area of the OLED light emitting unit for emitting the emission light of the first color are different from a light emitting shape and a light emitting area of the OLED light emitting unit for emitting the emission light of the second color.
As shown in fig. 6, all the OLED light emitting units included in the first pixel repeating unit 100 and/or the second pixel repeating unit 200 may be included, in this embodiment, each OLED light emitting unit corresponds to one sub-pixel, and the light emitting shape and the light emitting area of the first OLED light emitting unit 10 are different from those of the second OLED light emitting unit 20 and the third OLED light emitting unit 30. For example, the first OLED light emitting unit 10 is a green sub-pixel, and the second and third OLED light emitting units 20 and 30 are red and blue sub-pixels, respectively.
In one embodiment, the types of the first pixel repeating units 100 disposed on the entire transparent substrate 1 are not limited to one, and the first pixel repeating units 100 of different types include different numbers of OLED light emitting units, different light emitting shapes, different light emitting areas, and different light emitting colors.
For example, as shown in fig. 7, in one embodiment, the first pixel repeating unit 100 includes a first pixel repeating unit 10001 of a first type and a first pixel repeating unit 10002 of a second type, wherein the color of the light emitted by the OLED light emitting unit in the first pixel repeating unit 10001 of the first type is different from the color of the light emitted by the OLED light emitting unit in the first pixel repeating unit 10002 of the second type;
wherein, a plurality of first pixel repeating units 10001 of the first type and a plurality of first pixel repeating units 10002 of the second type are respectively distributed between a plurality of the second pixel repeating units 200.
Alternatively, in the embodiment shown in fig. 7, the first pixel repeating unit 10001 of the first type includes a red sub-pixel, a blue sub-pixel, and a green sub-pixel, and the first pixel repeating unit 10002 of the second type includes a green sub-pixel, and optionally, the light emitting region shape and the light emitting area of the green sub-pixel of the first pixel repeating unit 10002 of the second type may be different from the light emitting region shape and the light emitting area of the red sub-pixel and the blue sub-pixel of the first pixel repeating unit 10001 of the first type, respectively. Alternatively, the second pixel repeating unit 200 includes red, green, and blue sub-pixels, and alternatively, the light emitting region shapes and the light emitting areas of the three sub-pixels may be different.
In this embodiment of the present invention, optionally, the first pixel repeating unit 10001 of the first type and the first pixel repeating unit 10002 of the second type are distributed between the plurality of second pixel repeating units 200, so as to ensure the pixel distribution uniformity and the brightness uniformity of the two display planes of the dual-sided display panel device.
In yet another embodiment, as shown in fig. 8, the first pixel repeating unit 10001 of the first type includes a red subpixel, the first pixel repeating unit 10002 of the second type includes a green subpixel, and a light emitting region shape and a light emitting area of the green subpixel of the first pixel repeating unit 10002 of the second type may be different from a light emitting region shape and a light emitting area of the red subpixel of the first pixel repeating unit 10001 of the first type. Alternatively, the second pixel repeating unit 200 includes red, green, and blue sub-pixels, and alternatively, the light emitting region shapes and the light emitting areas of the three sub-pixels may be different. This embodiment, optionally, the shape and light-emitting area of the light-emitting region of the green sub-pixel are different from those of the green sub-pixel in the embodiment shown in fig. 7.
Further, in the embodiment shown in fig. 8, the first pixel repeating unit 10001 of the first type and the first pixel repeating unit 10002 of the second type are distributed at intervals in the second pixel repeating unit 200.
Optionally, in the OLED display panel according to the embodiment of the present invention, the OLED light emitting unit emitting the first color in the first pixel repeating unit 100 is adjacent to the OLED light emitting unit emitting the first color in the second pixel repeating unit 200. For example, in the embodiment shown in fig. 8, the green sub-pixel of the second type of the first pixel repeating unit 10002 is adjacent to the green sub-pixel of the second pixel repeating unit 200, and optionally, the total light emitting area formed by the adjacent two green sub-pixels in combination is the same as the light emitting area of the red sub-pixel and the blue sub-pixel of the second pixel repeating unit 200, respectively.
With this embodiment, when the OLED display panel displays an output on the front side, the green sub-pixel of the first pixel repeating unit 10002 of the second type and the adjacent green sub-pixel of the second pixel repeating unit 200 may be combined and shared to realize the display output of the front image.
In another embodiment, optionally, a first OLED light emitting unit in the first pixel repeating unit 100 is adjacent to a second OLED light emitting unit and a third OLED light emitting unit in the second pixel repeating unit 200, wherein the first OLED light emitting unit, the second OLED light emitting unit, and the third OLED light emitting unit are respectively configured to emit light of different colors.
For example, in the embodiment shown in fig. 8, the red sub-pixel in the first pixel repeating unit 100 is adjacent to the blue sub-pixel and the green sub-pixel in the second pixel repeating unit 200, and with this implementation structure, the red sub-pixel in the first pixel repeating unit 100 can be shared by the second pixel repeating unit 200, and the red sub-pixel in the first pixel repeating unit 100 and the blue sub-pixel and the green sub-pixel in the second pixel repeating unit 200 are combined to form one pixel unit for realizing the display output of the front image.
In the OLED display panel according to the embodiment of the present invention, in the embodiments shown in fig. 7 and 8, the plurality of sub-pixels are formed in a checkerboard structure, which can ensure brightness uniformity during double-sided display and ensure non-granular display compared with the implementation structures shown in fig. 4 and 5.
According to the OLED display panel provided by the embodiment of the invention, double-sided image display can be realized through the plurality of pixel structures arranged on the same transparent substrate, and compared with the prior art that double-sided display is realized through a pasting mode by adopting two OLED display panels, the display device manufactured by the mode has the problems of high cost, difficulty in thinning thickness and bulkiness.
In another aspect, the present invention further provides a display device including the OLED display panel having the above structure.
From the above detailed description, a person skilled in the art should understand the specific structure of the display device using the OLED display panel according to the embodiments of the present invention, and will not be described in detail here.
It should be noted that the OLED display panel according to the embodiment of the present invention may be at least one of AMOLED PMOLED.
The display device may be at least one of a flat cell phone, a wearable display device, a foldable cell phone, a curling display device, a notebook computer, an electronic board, a tablet computer, and a display glass wall.
In another aspect, an embodiment of the present invention further provides a method for manufacturing an OLED display panel, as shown in fig. 9, where the method includes:
s910, providing a transparent substrate;
s920, preparing a plurality of first pixel repeating units and a plurality of second pixel repeating units on the transparent substrate;
the first pixel repeating unit comprises at least one OLED light-emitting unit and is used for emitting light rays in a direction away from the transparent substrate; the second pixel repeating unit comprises at least one OLED light-emitting unit, is used for emitting light in a direction away from the transparent substrate and is also used for emitting light in a direction towards the transparent substrate, and the emitted light can penetrate through the transparent substrate.
Optionally, the OLED light emitting unit in the first pixel repeating unit includes a first anode, a first cathode, and a first light emitting layer between the first anode and the first cathode; the OLED light emitting unit in the second pixel repeating unit includes a second anode, a second cathode, and a second light emitting layer between the second anode and the second cathode, wherein a plurality of first pixel repeating units and a plurality of second pixel repeating units are prepared on the transparent substrate, including:
forming the first anode and the second anode through a double patterning process;
forming the first light emitting layer and the second light emitting layer through the same patterning process;
the first cathode and the second cathode are formed through the same patterning process.
Optionally, as shown in fig. 1, the preparation method according to the embodiment of the present invention may include:
providing a transparent substrate 1;
depositing a buffer layer 101 on a transparent substrate 1;
depositing an active layer material, such as a P-Si material, on the buffer layer 101;
patterning the active layer material to form a first active layer 114 and a second active layer 214 as a remaining region;
depositing a gate insulating material on the buffer layer 101 forming the first and second active layers 114 and 214 to form a first gate insulating layer 102;
depositing a gate material on the first gate insulating layer 102;
patterning the gate material to form a first gate 115 and a second gate 215 as a remaining region;
depositing an insulating layer material on the first gate insulating layer 102 on which the first gate electrode 115 and the second gate electrode 215 are formed, to form an interlayer insulating layer 103;
forming a first via hole by patterning, the first via hole penetrating through the interlayer insulating layer 103 and the first gate insulating layer 102 to communicate with the first active layer 114 and the second active layer 214;
depositing a data line material on the interlayer insulating layer 103, the data line material being connected to the first and second active layers 114 and 214 through the first via hole;
patterning the data line material to form a first source/drain 116 and a second source/drain 216;
depositing a planarization layer material on the interlayer insulating layer 103 where the first source/drain electrode 116 and the second source/drain electrode 216 are formed, to form a planarization layer 104;
forming a second via hole by patterning, such that the second via hole penetrates the planarization layer 104 and communicates with the first source/drain 116;
depositing a first anode material having a light reflecting property, such as a stacked material of ITO/Ag/ITO, on the planarization layer 104, the first anode material being connected to the first source/drain 116 through the second via hole;
patterning the first anode material to form a first anode 111 as a reserved area;
forming a third via hole by patterning, such that the third via hole penetrates the planarization layer 104 and is connected to the second source/drain 216;
depositing a second anode material having high light transmittance, such as ITO, on the planarization layer 104 formed with the first anode 111, the second anode material being connected to the second source/drain electrode 216 through the third via hole;
patterning the second anode material to form a second anode 211 as a reserved region;
depositing a pixel defining layer material on the planarization layer 104 formed with the first anode 111 and the second anode 211, to be formed as a pixel defining layer 105;
making a fourth via hole by patterning, wherein the fourth via hole penetrates through the pixel defining layer 105 and is communicated with the first anode 111 and the second anode 211;
forming a first light emitting layer 112 and a second light emitting layer 212 by the same evaporation process;
depositing a spacer material on the pixel defining layer 105 made with the first light emitting layer 112 and the second light emitting layer 212;
patterning the spacer material to form a retention region as a spacer PS layer 300;
on the basis of preparing the spacer layer 300, a first cathode 113 and a second cathode 213 are formed by a one-time evaporation process;
an encapsulation material is deposited on the first cathode 113 and the second cathode 213 to form an encapsulation layer.
According to the OLED display panel and the preparation method, the double-sided image display can be realized through the plurality of pixel structures arranged on the same transparent substrate, and the preparation process is simple and convenient.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (16)
1. The OLED display panel is characterized by comprising a transparent substrate, and a plurality of first pixel repeating units and a plurality of second pixel repeating units which are arranged on the transparent substrate, wherein the first pixel repeating units and the second pixel repeating units are distributed on the transparent substrate at intervals;
the first pixel repeating unit comprises at least one OLED light-emitting unit and is used for emitting light rays in a direction away from the transparent substrate;
the second pixel repeating unit comprises at least one OLED light-emitting unit, is used for emitting light in a direction away from the transparent substrate and is also used for emitting light in a direction towards the transparent substrate, and the emitted light can penetrate through the transparent substrate.
2. The OLED display panel of claim 1, wherein the first pixel repeating unit comprises at least two first OLED light emitting units for emitting different color lights;
the second pixel repeating unit comprises at least two second OLED light-emitting units, and the at least two second OLED light-emitting units are used for emitting light rays with different colors.
3. The OLED display panel according to claim 2, wherein a plurality of the first pixel repeating units are sequentially connected along a first direction to form a first region, and a plurality of the second pixel repeating units are sequentially connected along the first direction to form a second region on the transparent substrate;
wherein, along a second direction, the first region and the second region are arranged at intervals; the first direction is perpendicular to the second direction.
4. The OLED display panel according to claim 2, wherein a plurality of the first pixel repeating units and a plurality of the second pixel repeating units are arranged at intervals in a first direction and a second direction perpendicular to each other on the transparent substrate, respectively.
5. The OLED display panel according to any one of claims 1 to 4, wherein at least one of the first pixel repeating unit and the second pixel repeating unit comprises an OLED light emitting unit, each OLED light emitting unit has a quadrilateral light emitting area, and the light emitting areas of at least two first OLED light emitting units are combined to form a quadrilateral.
6. The OLED display panel according to any one of claims 1 to 4, wherein at least one of the first pixel repeating unit and the second pixel repeating unit includes an OLED light emitting unit having a light emitting shape and a light emitting area of the OLED light emitting unit for emitting the emission light of the first color different from those of the OLED light emitting unit for emitting the emission light of the second color.
7. The OLED display panel of claim 1, wherein the first pixel repeating unit comprises a first pixel repeating unit of a first type and a first pixel repeating unit of a second type, wherein the color of the light emitted by the OLED light emitting unit in the first pixel repeating unit of the first type is different from the color of the light emitted by the OLED light emitting unit in the first pixel repeating unit of the second type;
the first pixel repeating units of the first type and the first pixel repeating units of the second type are respectively distributed among the second pixel repeating units.
8. The OLED display panel of claim 1, wherein the OLED light emitting unit emitting the first color in the first pixel repeating unit is adjacent to the OLED light emitting unit emitting the first color in the second pixel repeating unit.
9. The OLED display panel of claim 1, wherein a first OLED light emitting unit in the first pixel repeating unit is adjacent to a second OLED light emitting unit and a third OLED light emitting unit in the second pixel repeating unit, wherein the first OLED light emitting unit, the second OLED light emitting unit and the third OLED light emitting unit are configured to emit light of different colors.
10. The OLED display panel of claim 1, wherein the OLED light emitting unit in the first pixel repeating unit comprises a top-emission type OLED light emitting device, and the OLED light emitting unit in the second pixel repeating unit comprises a dual-emission type OLED light emitting device.
11. The OLED display panel of claim 1, wherein the OLED light emitting unit in the first pixel repeating unit includes a first anode, a first cathode, and a first light emitting layer between the first anode and the first cathode; the OLED light emitting unit in the second pixel repeating unit comprises a second anode, a second cathode and a second light emitting layer positioned between the second anode and the second cathode;
the first anode and the second anode are made of different materials on the same layer, the first light-emitting layer and the second light-emitting layer, and the first cathode and the second cathode are respectively made of the same material on the same layer, and the first cathode, the second anode and the second cathode are all transparent electrodes.
12. The OLED display panel of claim 11, wherein the first anode is made of a stacked structure of ITO/Ag/ITO, and the second anode is made of ITO.
13. The OLED display panel of claim 11, wherein the first pixel repeating unit and the second pixel repeating unit further include a thin film transistor for driving each OLED light emitting unit to emit light, respectively;
the thin film transistor of the first pixel repeating unit comprises a first active layer, a first grid electrode and a first source/drain electrode, the first source/drain electrode is connected with the first anode electrode, and the orthographic projection of the first light-emitting layer on the plane of the first source/drain electrode is overlapped with the first source/drain electrode;
the thin film transistor of the second pixel repeating unit includes a second active layer, a second gate electrode, and a second source/drain electrode connected to the second anode electrode;
the first active layer and the second active layer, the first grid electrode and the second grid electrode, and the first source/drain electrode and the second source/drain electrode are respectively arranged on the same layer and the same material.
14. A display device comprising the OLED display panel according to any one of claims 1 to 13.
15. A method of manufacturing an OLED display panel as claimed in any one of claims 1 to 13, wherein the method of manufacturing comprises:
providing a transparent substrate;
preparing a plurality of first pixel repeating units and a plurality of second pixel repeating units on the transparent substrate;
the first pixel repeating unit comprises at least one OLED light-emitting unit and is used for emitting light rays in a direction away from the transparent substrate; the second pixel repeating unit comprises at least one OLED light-emitting unit, is used for emitting light in a direction away from the transparent substrate and is also used for emitting light in a direction towards the transparent substrate, and the emitted light can penetrate through the transparent substrate.
16. A production method according to claim 15, wherein the OLED light-emitting unit in the first pixel repeating unit includes a first anode, a first cathode, and a first light-emitting layer between the first anode and the first cathode; the OLED light emitting unit in the second pixel repeating unit includes a second anode, a second cathode, and a second light emitting layer between the second anode and the second cathode, wherein a plurality of first pixel repeating units and a plurality of second pixel repeating units are prepared on the transparent substrate, including:
forming the first anode and the second anode through a double patterning process;
forming the first light emitting layer and the second light emitting layer through the same patterning process;
the first cathode and the second cathode are formed through the same patterning process.
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