CN111092107B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN111092107B CN111092107B CN201911355123.6A CN201911355123A CN111092107B CN 111092107 B CN111092107 B CN 111092107B CN 201911355123 A CN201911355123 A CN 201911355123A CN 111092107 B CN111092107 B CN 111092107B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
Abstract
The embodiment of the invention provides a display panel and a display device. Under the action of an electric field, the bending radius of the corresponding anode is adjusted through the deformation of the color cast adjusting layer, so that the emergent direction of the interference light beam is changed into a non-vertical direction, and the color cast phenomenon of the display panel is further changed.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel and a display device.
[ background of the invention ]
Currently, display technologies have penetrated various aspects of people's daily lives, and accordingly, more and more materials and technologies are used for display screens. Nowadays, the mainstream display screens mainly include liquid crystal display screens and organic light emitting diode display screens. Because the Organic Light-Emitting Diode (OLED) display screen has a self-luminous property, compared with a liquid crystal display screen, a backlight module which consumes most energy is omitted, and therefore, the Organic Light-Emitting Diode display screen has the advantage of energy saving; in addition, the organic light emitting diode display screen has the characteristic of flexibility and bendability, and the OLED display screen has excellent bendability by adopting the flexible substrate and the plurality of conducting layers which are sequentially formed on the flexible substrate and comprise the thin film transistor driving array layer, the anode layer, the organic light emitting layer, the cathode layer and the thin film packaging layer.
However, as the service life of the OLED display panel increases, the wavelength of the emitted light changes due to the half-life of the organic light emitting material and due to the microcavity effect. Meanwhile, the white light mixed by red, green and blue light has a certain color shift phenomenon, for example, the red light has a serious color shift, thereby affecting the display function of the display terminal product.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a display panel and a display device, in which a color shift adjusting layer is added to the display panel. Under the action of an electric field, the bending radius of the corresponding anode is adjusted through the deformation of the color cast adjusting layer, so that the emergent direction of the interference light beam is changed into a non-vertical direction, and the color cast phenomenon of the display panel is further changed.
In one aspect, embodiments of the present invention provide a display panel, including,
a pixel unit including an anode, a light emitting layer, and a cathode;
the thin film transistor layer comprises a plurality of thin film transistors, the anode is positioned on one side of the cathode close to the thin film transistor layer, and the thin film transistors are electrically connected with the anodes in the corresponding pixel units;
the color cast adjusting layer is positioned between the pixel unit and the thin film transistor layer; under the action of an electric field, the bending radius of the corresponding anode is adjusted through the deformation of the color cast adjusting layer;
the color cast adjusting layer comprises an electrostrictive composite layer and an organic buffer layer which are arranged in a stacked mode, and the electrostrictive composite layer comprises electrostrictive materials.
In one embodiment of the present application, the color shift adjusting layer has a sandwich structure; wherein the content of the first and second substances,
the organic buffer layer comprises a first organic buffer layer and a second organic buffer layer; the electrostrictive composite layer is located between the first organic buffer layer and the second organic buffer layer.
In one embodiment of the present application, the first organic buffer layer has a thickness substantially equal to a thickness of the electrostrictive composite layer in a state where the electrostrictive composite layer is not deformed; wherein the first organic buffer layer is in direct contact with the anode in the corresponding pixel unit.
In one embodiment of the present application, the second organic buffer layer is located between the electrostrictive composite layer and the thin-film transistor layer; the thickness of the second organic buffer layer is greater than or equal to the thickness of the first organic buffer layer.
In one embodiment of the present application, the electrostrictive composite layer includes a first electrode, an electrostrictive material layer, and a second electrode, which are sequentially stacked; wherein when a voltage is applied to the first electrode and the second electrode, an electric field is formed therebetween; under the action of the electric field, the electrostrictive material layer deforms and is in a compressed or expanded state.
In one embodiment of the present application, the first electrode and the second electrode are made of a flexible elastic conductive material.
In one embodiment of the present application, the anode comprises a reflective metal layer, and the first electrode and/or the second electrode are made of the same material as the reflective metal layer.
In a specific embodiment of the present application, the first electrode and the second electrode are made of an elastic transparent conductive material, and the elastic transparent conductive material comprises any one or a combination of layered graphite, graphene and carbon nanotubes; or the elastic transparent conductive material comprises any one or combination of gold, silver, aluminum and molybdenum.
In one embodiment of the present application, the display panel includes a display region and a non-display region, and the electrostrictive composite layer is disposed in the display region; the display panel further comprises a deformation control chip for realizing the adjustment of the electric field between the first electrode and the second electrode; the electrostriction composite layer further comprises a signal transmission line, and the deformation control chip is connected with the first electrode and/or the second electrode through the signal transmission line.
In one embodiment of the present application, the electrostrictive composite layer has a one-piece structure, wherein the first electrode has a one-piece structure covering the display region; the second electrode is a planar integrated structure and covers the display area; the electrostrictive material layer is of a planar integrated structure and covers the display area.
In one embodiment of the present application, the display area includes a central area and an edge area, wherein the edge area is disposed adjacent to the non-display area; the electrostrictive composite layer comprises a central electrostrictive composite layer and an edge electrostrictive composite layer, wherein the central electrostrictive composite layer and the edge electrostrictive composite layer are arranged separately and are controlled independently.
In a specific embodiment of the present application, the deformation control chip includes a central region processing unit and an edge region processing unit, and the central region processing unit is configured to control an electric field variation in the central electrostrictive composite layer; the edge area processing unit is used for controlling the electric field change in the edge electrostriction composite layer.
In one embodiment of the present application, the display area is divided into a plurality of sub-display areas, each sub-display area includes a plurality of the pixel units; the electrostrictive composite layer includes a plurality of first sub-electrostrictive composite layers, the first sub-electrostrictive composite layers being disposed apart from each other and controlled independently of each other; each of the sub-display regions includes at least one first sub-electrostrictive composite layer for enabling independent control of the magnitude of the bending radius of the anode electrode in each sub-display region.
In one embodiment of the present application, the electrostrictive material includes a silicone rubber oligomer, a urethane oligomer, an acrylate rubber oligomer; or a compound of the material and an inorganic micro-nano material.
In another aspect, an embodiment of the present invention provides a display device, which includes the above display panel.
According to the light-emitting display panel and the display device provided by the embodiment of the invention, the color cast adjusting layer is added to the display panel. The color cast adjusting layer comprises a first organic buffer layer, a second organic buffer layer and an electrostrictive composite layer positioned between the first organic buffer layer and the second organic buffer layer. The electrostrictive material in the electrostrictive composite layer changes the phase state of the material under the action of an electric field, so that the electrostrictive composite layer deforms, such as a convex structure or a concave structure. The electrostriction composite layer is covered with the organic buffer layer and has larger elastic modulus, so that the electrostriction composite layer is deformed, and the integral color cast adjusting layer is deformed.
And the anodes of the pixel units are covered on the color cast adjusting layer, when the color cast adjusting layer deforms, the anodes of the pixel units can be influenced to deform, and a convex structure or a concave structure can be presented along with the deformation. Thereby causing the anode to change its bend radius and thus changing the planar state in which the anode was originally in (which can be understood as a bend radius of 0). When the anode is bent, the emergent direction of interference beams formed by the microcavity effect corresponding to the OLED light-emitting device is a non-vertical direction, so that the color cast phenomenon of the display panel is changed.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel 10 according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display area AA of the display panel 10 in fig. 1;
FIG. 3 is a cross-sectional schematic view of a section of FIG. 2 in dashed line AA;
FIG. 4 is an enlarged schematic view of the electrostrictive composite layer ES of FIG. 3;
FIG. 5 is a schematic cross-sectional view of a broken line AA in FIG. 2 in a deformed state;
FIG. 6 is an enlarged schematic view of the electrostrictive composite layer ES in FIG. 5;
FIG. 7 is a schematic cross-sectional view of the broken line AA in FIG. 2 in a deformed state two;
FIG. 8 is an enlarged schematic view of the electrostrictive composite layer ES in FIG. 7;
fig. 9 is another schematic structural diagram of the display area AA of the display panel 10 in fig. 1;
fig. 10 is a schematic view of another structure of the display area AA of the display panel 10 in fig. 1;
fig. 11 is a schematic view of another structure of the display area AA of the display panel 10 in fig. 1;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a display panel in the prior art.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the pixel group in the embodiments of the present invention, the organic buffer layers should not be limited to these terms. These terms are only used to distinguish the organic buffer layers from each other. For example, the first organic buffer layer may also be referred to as a second organic buffer layer, and similarly, the second organic buffer layer may also be referred to as a first organic buffer layer, without departing from the scope of embodiments of the present invention.
As shown in fig. 13, the display panel in the related art includes a first pixel unit OL, a first thin film crystal layer 1 for driving the first pixel unit OL, and an organic buffer layer 2 therebetween. The first pixel unit OL includes a first anode 3, a first light-emitting layer 4, and a first cathode 5 stacked in this order in the thickness direction of the display panel. In the prior art, the functional film layers are arranged in parallel, and the first anode 3 is always in a flat state and presents a planar structure. Therefore, the emission direction of the interference light beam due to the microcavity effect is almost perpendicular to the first pixel unit OL. Therefore, there arises a problem that the color of light and the intensity of light are different when the user uses the display panel at different viewing angles. In addition, with the increase of the service life of the display panel, the wavelength of the emergent light can be changed due to the half-life period of the organic light-emitting material, and in addition to the microcavity effect of the OLED light-emitting device, a certain color cast phenomenon can occur in the white light after the red, green and blue light are mixed, and problems such as single color cast and the like can occur. Generally, problems such as a serious red color shift may occur, which may affect the display function of the display terminal product.
Specifically, as shown in fig. 1 to 11, an embodiment of the present invention provides a display panel 10, including:
a pixel unit 11 including an anode 111, a light emitting layer 113, and a cathode 112;
a thin film transistor layer 13 including a plurality of thin film transistors, wherein the anode 111 is located on a side of the cathode 112 close to the thin film transistor layer 13, and the thin film transistors are electrically connected to the anodes 111 in the corresponding pixel units 11;
a color shift adjusting layer 12 located between the pixel unit 11 and the thin film transistor layer 13; under the action of an electric field, the bending radius of the corresponding anode 111 is adjusted through the deformation of the color cast adjusting layer 12;
the color shift adjusting layer 12 includes an electrostrictive composite layer ES and an organic buffer layer (P1/P2), the electrostrictive composite layer ES including an electrostrictive material.
According to the technical scheme, the color cast adjusting layer is additionally arranged on the display panel. Under the action of an electric field, the bending radius of the corresponding anode is adjusted through the deformation of the color cast adjusting layer, so that the emergent direction of the interference light beam is changed into a non-vertical direction, and the color cast phenomenon of the display panel is further changed.
As shown in fig. 1 to 3, in one embodiment of the present application, the display panel 10 includes a display area AA and a non-display area DA disposed around the display area AA. In the display area AA, a plurality of pixel units 11, a color shift adjusting layer 12, and a thin-film transistor layer 13 are sequentially included in the thickness direction of the display panel 10.
Each pixel unit 11 is an independent OLED light-emitting unit or an OLED light-emitting device, and includes an anode 111 electrically connected to a corresponding thin film transistor, and is configured to receive a pulse-type control signal output by the thin film transistor to the pixel unit 11; a cathode 112 for receiving a constant potential signal provided on the display panel; and a light emitting layer 113 positioned between the anode 111 and the cathode 112. The light-emitting layer includes a plurality of organic functional film layers, which reflect visible light when a voltage difference is generated between the anode 111 and the cathode 112. In one embodiment of the present application, visible light is emitted from the cathode 112 side. Each pixel unit 11 emits red light, green light, or blue light, and monochromatic light emitted from the plurality of pixel units 11 is mixed to form white light.
As shown in fig. 2 to 3, the thin film transistor layer 13 includes a plurality of thin film transistors (which may be understood as driving thin film transistors) arranged in an array, and each thin film transistor is electrically connected to a corresponding pixel unit 11 for providing a driving signal to the corresponding pixel unit 11. Specifically, each thin film transistor is electrically connected to the anode 111 in the corresponding pixel unit 11, thereby enabling transmission of a driving signal so that the pixel unit 11 is in a light-emitting state or a non-light-emitting state.
In order to change the color shift phenomenon of the pixel unit 11, such as the problem of monochrome color shift caused by the structure of the display panel adopted in the prior art, in one embodiment of the present application, a color shift adjusting layer 12 having a sandwich structure is added between the pixel unit 11 and the thin film transistor layer 13. The bending radius of the anode 111 in the corresponding pixel unit 11 is adjusted by the deformation of the color shift adjusting layer 12 under the action of the electric field. As shown in FIGS. 3-8, it can be understood that: the anode 111 of the pixel unit 11 covers the color shift adjusting layer 12, and when the color shift adjusting layer 12 deforms, the corresponding anode 111 is also influenced to deform, and accordingly, a convex structure (as shown in fig. 7 and 8) or a concave structure (as shown in fig. 5 and 6) is also presented. Thereby causing the anode to change its bend radius and thus changing the planar state in which the anode was originally in (which can be understood as a bend radius of 0). When the anode is bent, the emergent direction of interference beams formed by the microcavity effect corresponding to the OLED light-emitting device is a non-vertical direction, so that the color cast phenomenon of the display panel is changed.
As shown in fig. 3 and 4, the color shift adjusting layer 12 includes an electrostrictive composite layer ES and an organic buffer layer (P1/P2) in a stacked arrangement, wherein the electrostrictive composite layer ES includes an electrostrictive material. Specifically, the color shift adjusting layer 12 has a sandwich structure, and includes a first organic buffer layer P1, an electrostrictive composite layer ES, and a second organic buffer layer P2 in this order in the thickness direction of the display panel 10. The first organic buffer layer P1 and the second organic buffer layer P2 are made of organic polymer materials, such as polyacetyl imine or polyethylene, and have a high elastic modulus and are relatively easy to deform.
Meanwhile, the organic buffer layer (P1/P2) has a better planarization effect on metal devices, metal wires and the like in the thin-film transistor layer 13 in the display panel, so that the display panel has a smoother surface after the thin-film transistor layer 13 is manufactured. In addition, the first organic buffer layer P1 and the second organic buffer layer P2 are made of insulating materials, so that the organic light emitting diode can also play an insulating role, and prevent short circuit between metal films or metal wires in the display panel.
In a specific embodiment of the present application, through the above sandwich structure, that is, the organic buffer layers (P1/P2) with higher elastic modulus are respectively covered on the electrostrictive composite layer ES, it is able to prevent the stress concentration in the display panel caused by the deformation of the electrostrictive composite layer ES when an electric field is applied, thereby affecting the problems such as the fracture of the thin film transistor layer 13 or other metal traces. Specifically, the first organic buffer layer P1 is in direct contact with the anode 111 in the corresponding pixel unit 11. Meanwhile, since the thickness of the organic buffer layer (P1/P2) is about 10 times or more the thickness of the anode 111. When the first organic buffer layer P1 is deformed, the anode 111 covering it is more easily deformed, and the probability of the occurrence of a break or crack is greatly reduced.
In addition, in an embodiment of the present application, in order to further ensure that the deformation of the first organic buffer layer P1 occurs, the deformation of the anode 111 covering the first organic buffer layer is easier. The thickness of the first organic buffer layer P1 is equal to or substantially equal to the thickness of the electrostrictive composite layer ES in a state where the electrostrictive composite layer ES is not deformed. It is thus possible to realize that the degree of deformation of the first organic buffer layer P1 is matched when the electrostrictive composite layer ES is deformed. So that the bending radius of the corresponding anode 111 can be more precisely adjusted.
Since the second organic buffer layer P2 between the electrostrictive composite layer ES and the thin film transistor layer 13 has a relatively large thickness, in an embodiment of the present invention, the thickness of the second organic buffer layer P2 is greater than or equal to the thickness of the first organic buffer layer P1. When the electrostrictive composite layer ES deforms, the second organic buffer layer P2 also deforms to some extent, but because the thickness of the second organic buffer layer is large, the thin film transistor layer 13 and other metal wires arranged below the second organic buffer layer P2 can be protected to some extent, and damage to the thin film transistor layer 13 and other metal wires due to stress concentration is prevented in the process of deformation of the electrostrictive composite layer ES.
As shown in fig. 3 to 8, in one embodiment of the present application, the electrostrictive composite layer ES includes a first electrode 121, an electrostrictive material layer 120, and a second electrode 122, which are sequentially stacked in the thickness direction of the display panel 10. When a voltage V is applied to the first electrode 121 and the second electrode 122, an electric field is formed therebetween. Under the action of the electric field, the electrostrictive material layer 120 is deformed into a compressed or expanded state.
Specifically, as shown in fig. 3 to 4, when the display panel 10 does not have a color shift problem, such as a monochromatic color shift, the electrostrictive material layer 120 is in a planar structure and the corresponding first organic buffer layer P1 and the anode 111 are also in a planar structure when the voltage V applied to the first electrode 121 and the second electrode 122 is 0 and no electric field is generated therebetween. At this time, the interference light beam generated by the microcavity effect in the pixel unit 11 is emitted in a direction approximately perpendicular to the cathode 112.
As shown in fig. 5 to 6, when the display panel 10 has a color shift problem, such as a single color shift, an electric field with a certain strength is formed between the first electrode 121 and the second electrode 122 by applying a voltage V1, where V1 is not 0 and may be a positive voltage or a negative voltage, the electrostrictive material layer 120 is compressed to form a concave structure, and the corresponding first organic buffer layer P1 and the anode 111 also form a concave structure, that is, the bending radius of the anode 111 changes from an original planar structure to an arc structure with a certain bending radius. At this time, the interference light beams generated by the microcavity effect in the pixel unit 11 are not emitted in a direction perpendicular to the cathode 112 any more, and the problem of color shift is changed to some extent.
In one embodiment of the present application, as shown in fig. 7 to 8, when the display panel 10 has a color shift problem, such as a single color shift, a voltage V2 is applied to the first electrode 121 and the second electrode 122, V2 is not 0, and may be a positive voltage or a negative voltage, and an electric field with a certain intensity is formed therebetween, at this time, the electrostrictive material layer 120 is in an expanded state and has a convex structure, and the corresponding first organic buffer layer P1 and the corresponding anode 111 also have a convex structure, that is, at this time, the bending radius of the anode 111 changes, and changes from an original planar structure to an arc structure with a certain bending radius. At this time, the interference light beams generated by the microcavity effect in the pixel unit 11 are not emitted in a direction perpendicular to the cathode 112 any more, and the problem of color shift is changed to some extent.
On the basis of the above-described embodiments, in the present application, for the electrostrictive composite layer ES, in order to ensure the deformation amount, the first electrode 121 and the second electrode 122 need to be made of a flexible elastic conductive material, so that when the electrostrictive material layer 120 is in an expanded state or a compressed state, the first electrode 121 and the second electrode 122 are deformed accordingly, thereby reducing the stress concentration and the like occurring inside the display panel.
In a specific embodiment of the present application, the first electrode and the second electrode are made of a material including an elastic transparent conductive material. Specifically, the elastic transparent conductive material comprises any one or combination of layered graphite, graphene and carbon nanotubes, and has good conductivity and excellent physical properties such as bending and deformation. In addition, the design of products with higher requirements on the light transmittance of the display panel can be met.
In another specific embodiment of the present application, the elastic transparent conductive material may further include any one or a combination of gold, silver, aluminum, and molybdenum. The combination of two or more metals is an alloy. The material has good conductivity, excellent physical properties such as bending and deformation, and high matching degree with the manufacturing process of the thin film transistor layer 13 on the display panel, so that the cost of the production process is reduced.
In another embodiment of the present application, in order to further match the manufacturing process of the electrostrictive composite layer ES with the manufacturing process of the display panel, the cost of the manufacturing process is further reduced. In this embodiment, the anode 111 in the pixel unit 11 includes a transparent electrode layer and a reflective metal layer. The reflecting metal layer can be of a Mg-Ag alloy structure, wherein the weight part of Mg to Ag can be 9: 1-1: 9. The same material may be used for the first electrode 121 and/or the second electrode 122 in the electrostrictive composite layer ES as the reflective metal layer.
For the electrostrictive material layer 120, it is made of a material including electrostrictive material. Specifically, the electrostrictive material includes a silicone rubber oligomer, a urethane oligomer, an acrylate rubber oligomer; or a compound of the material and an inorganic micro-nano material.
In one embodiment of the present application, the inorganic micro-nano material may include a layered insulator, a conductor, and a semiconductor, the layered insulator having a size of 50 to 1000 nm; or granular insulators, conductors, semiconducting materials such as molybdenum disulfide, layered graphite, lead zirconate titanate, lead magnesium niobate, and the like.
On the basis of the technical solutions disclosed above, the inventors of the present application have also made corresponding studies on the control of the color shift adjusting layer 12. As shown in fig. 2 in particular, the display panel may include a display control chip 15 and a deformation control chip 14. The display control chip 15 is configured to adjust a display function of the display panel 10, such as sending a control signal to each pixel unit 11; the deformation control chip 14 is used for adjusting whether the color shift adjusting layer 12 is deformed or not and the deformation amount, so as to adjust the bending radius of the corresponding anode.
Specifically, the deformation control chip 14 is used for adjusting the electric field between the first electrode 121 and the second electrode 122. In addition, in the case of the electrostrictive composite layer ES, a signal transmission line L12 is further included, and the deformation control chip 14 is connected between the first electrode 121 and/or the second electrode 122 via the signal transmission line L12. In one embodiment of the present application, the transmission line L12 is formed by patterning a metal film layer that is the same as the metal traces in the display panel, such as scan signal lines or data signal lines.
As shown in fig. 11, in one embodiment of the present application, the display control chip 15 and the deformation control chip 14 may be integrated on the same control chip. For example, the display control chip 15 may control the display function, and may adjust the deformation of the color shift adjustment layer 12 and the amount of the deformation. Specifically, the signal transmission line L12 may be connected into the display control chip 15.
Based on the above-mentioned technical solutions, in order to simplify the process steps and reduce the process cost, in one embodiment of the present application, as shown in fig. 2 and 3, the electrostrictive composite layer ES has a one-piece structure. Specifically, the first electrode 121 is a planar integrated structure, and covers the display area AA; the second electrode 122 is also a planar integrated structure covering the display area AA; the electrostrictive material layer 120 is also a planar integrated structure, and covers the display area AA. The first electrode 121 and the second electrode 122 in the electrostrictive composite layer ES are connected to the deformation control chip 14 through respective signal transmission lines L12. In one embodiment of the present application, only two signal transmission lines L12 may be provided, so as to reduce the complexity of the metal routing layout on the display panel.
For the OLED display panel, due to the influence of the packaging process, the probability and possibility of water and oxygen entering the edge region of the display region are higher, so that the OLED light-emitting device in the edge region is more easily corroded by water and oxygen, and thus the OLED organic light-emitting material is denatured, the wavelength of the emitted light is changed, the color shift phenomenon in the edge region of the display panel is more obvious, and the problem of color shift does not necessarily occur in the pixel unit located in the central region of the display region. Therefore, in order to more accurately control the color shift problem on the whole display panel, in an embodiment of the present application, as shown in fig. 9, the display area of the display panel includes a central area Ce and an edge area Br, where the edge area Br is disposed close to the non-display area, and the edge area Br may be disposed around the central area Ce. Correspondingly, the electrostrictive composite layer includes a central electrostrictive composite layer 12a located in the central region Ce, and an edge electrostrictive composite layer 12b located in the edge region Br. The two are separately arranged and respectively used for controlling the anode bending radius of the pixel unit positioned in the central area Ce and the anode bending radius of the pixel unit positioned in the edge area Br.
Meanwhile, the central electrostrictive composite layer 12a and the edge electrostrictive composite layer 12b are controlled independently of each other. Specifically, the central electrostrictive composite layer 12a is connected to the deformation control chip 14 through a first transmission signal line L121; the edge electrostrictive composite layer 12b is connected to the deformation control chip 14 through a second transmission signal line L122. In one embodiment of the present application, the deformation control chip 14 includes a central area processing unit and an edge area processing unit. The central area processing unit is used for controlling the electric field change in the central electrostrictive composite layer 12 a; the edge area processing unit is used to control the electric field variation in the edge electrostrictive composite layer 12 b.
In the above embodiment, the variation of the anode bend radius in the pixel cell is controlled independently by the edge region Br and the center region Ce of the display area, respectively. For example, the control of the magnitude of the deformation of the edge electrostrictive composite layer 12b may be started without applying a voltage to the center electrostrictive composite layer 12a and without performing adjustment. Therefore, the anode bending radius on the whole display panel can be accurately controlled.
On the basis of the above embodiment, in order to further realize accurate control of the anode bending radius of each area on the whole display panel, thereby realizing color cast adjustment of each area. For example, it is possible to realize individual control of regions where colors are severely polarized.
As shown in fig. 10, in a specific embodiment, the display area of the display panel is divided into a plurality of sub-display areas PX, and each sub-display area PX includes a plurality of pixel units 11. In one embodiment, an area of one sub-display area PX may be 30 to 50 μm 2 Size. Of course, the division may be performed according to the actual size of the display panel.
For the electrostrictive composite layer, it includes a plurality of first sub-electrostrictive composite layers 12c arranged in an array. Wherein the plurality of first sub-electrostrictive composite layers 12c are provided separately from each other and are controlled independently of each other. Specifically, each of the first sub-electrostrictive composite layers 12c is connected to the deformation control chip 14 through the third transmission signal line L123. Among them, the third transmission signal line L123 may be wired in the display region and made by sharing a metal film layer in the display panel, so that a wiring space may be saved.
In one embodiment of the present application, each sub-display area PX may include at least one first sub-electrostrictive composite layer 12c for enabling independent control of the magnitude of the bending radius of the anode electrode of the pixel unit 11 in each sub-area. Specifically, a first sub-electrostrictive composite layer 12c is correspondingly disposed in each sub-display area PX in a covering manner, and each first sub-electrostrictive composite layer 12c is independently controlled by the distortion control chip 14 to give a signal whether to adjust the electric field. Therefore, the control of the anode bending radius of the pixel unit of the specific sub-display area is realized, and the color cast adjustment of the specific area is realized.
In the above embodiment, the independent color shift adjusting layer is separately provided for each sub-display region, so that the region with serious color shift in a part of the display regions can be independently controlled.
As shown in fig. 12, fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention, and the display device includes the display panel 10. The specific structure of the display panel 10 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 12 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
Since the display device provided by the embodiment of the invention comprises the display panel, by adopting the display device, a color cast adjusting layer is added on the display panel. Under the action of an electric field, the bending radius of the corresponding anode is adjusted through the deformation of the color cast adjusting layer, so that the emergent direction of the interference light beam is changed into a non-vertical direction, and the color cast phenomenon of the display panel is further changed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. A display panel, comprising,
a pixel unit including an anode, a light emitting layer, and a cathode;
the thin film transistor layer comprises a plurality of thin film transistors, the anode is positioned on one side of the cathode close to the thin film transistor layer, and the thin film transistors are electrically connected with the anodes in the corresponding pixel units;
the color cast adjusting layer is positioned between the pixel unit and the thin film transistor layer; under the action of an electric field, the bending radius of the corresponding anode is adjusted through the deformation of the color cast adjusting layer;
the color cast adjusting layer comprises an electrostrictive composite layer and an organic buffer layer which are arranged in a laminated mode, and the electrostrictive composite layer comprises electrostrictive materials;
in the thickness direction of the display panel, the electrostrictive composite layer comprises a first electrode, an electrostrictive material layer and a second electrode which are sequentially stacked;
wherein when a voltage is applied to the first electrode and the second electrode, an electric field is formed therebetween;
under the action of the electric field, the electrostrictive material layer deforms and is in a compressed or expanded state;
wherein, the first and the second end of the pipe are connected with each other,
when the electrostrictive material layer is deformed and is in a compressed state under the action of the electric field, the electrostrictive material layer is in a concave structure, and the corresponding anode is in a concave structure;
when under the electric field effect, the electrostrictive material layer is deformed and is in an expansion state, the electrostrictive material layer is in a convex structure, and correspondingly, the anode is in a convex structure.
2. The display panel according to claim 1, wherein the color shift adjusting layer has a sandwich structure; wherein the content of the first and second substances,
the organic buffer layer comprises a first organic buffer layer and a second organic buffer layer;
the electrostrictive composite layer is located between the first organic buffer layer and the second organic buffer layer.
3. The display panel according to claim 2, wherein the first organic buffer layer has a thickness equal to that of the electrostrictive composite layer in a state where the electrostrictive composite layer is not deformed;
wherein the first organic buffer layer is in direct contact with the anode in the corresponding pixel unit.
4. The display panel of claim 3, wherein the second organic buffer layer is between the electrostrictive composite layer and the thin-film transistor layer;
the thickness of the second organic buffer layer is greater than or equal to the thickness of the first organic buffer layer.
5. The display panel according to claim 1, wherein the first electrode and the second electrode are made of a conductive material including bendable elasticity.
6. The display panel according to claim 5, wherein the anode comprises a reflective metal layer, and the first electrode and/or the second electrode are made of the same material as the reflective metal layer.
7. The display panel according to claim 5, wherein the first electrode and the second electrode are made of a material including an elastic transparent conductive material,
the elastic transparent conductive material comprises any one or combination of layered graphite, graphene and carbon nano tubes, or,
the elastic transparent conductive material comprises any one or combination of gold, silver, aluminum and molybdenum.
8. The display panel according to claim 1, wherein the display panel comprises a display region and a non-display region, and the electrostrictive composite layer is disposed in the display region;
the display panel further comprises a deformation control chip for adjusting an electric field between the first electrode and the second electrode;
the electrostriction composite layer further comprises a signal transmission line, and the deformation control chip is connected with the first electrode and/or the second electrode through the signal transmission line.
9. The display panel according to claim 8, wherein the electrostrictive composite layer is a one-piece structure in which,
the first electrode is a planar integrated structure and covers the display area;
the second electrode is a planar integrated structure and covers the display area;
the electrostrictive material layer is of a planar integrated structure and covers the display area.
10. The display panel according to claim 8, wherein the display region includes a center region and an edge region, wherein the edge region is disposed adjacent to the non-display region;
the electrostrictive composite layer comprises a central electrostrictive composite layer and an edge electrostrictive composite layer, wherein the central electrostrictive composite layer and the edge electrostrictive composite layer are arranged separately and are controlled independently.
11. The display panel according to claim 10, wherein the deformation control chip includes a central area processing unit and an edge area processing unit,
the central area processing unit is used for controlling the electric field change in the central electrostrictive composite layer;
the edge area processing unit is used for controlling the electric field change in the edge electrostriction composite layer.
12. The display panel according to claim 8, wherein the display area is divided into a plurality of sub-display areas, each sub-display area including a plurality of the pixel units;
the electrostrictive composite layer includes a plurality of first sub-electrostrictive composite layers, the first sub-electrostrictive composite layers being disposed apart from each other and controlled independently of each other;
each of the sub-display regions includes at least one of the first sub-electrostrictive composite layers for enabling independent control of the magnitude of the bending radius of the anode electrode in each of the sub-display regions.
13. The display panel according to any one of claims 1 to 12, wherein the electrostrictive material comprises a silicone rubber oligomer, a polyurethane oligomer, an acrylate rubber oligomer, or a composite of the aforementioned material and an inorganic micro-nano material.
14. A display device comprising the display panel according to any one of claims 1 to 13.
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| CN201911355123.6A CN111092107B (en) | 2019-12-25 | 2019-12-25 | Display panel and display device |
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| CN201911355123.6A CN111092107B (en) | 2019-12-25 | 2019-12-25 | Display panel and display device |
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| CN114822420A (en) * | 2022-04-21 | 2022-07-29 | 福州京东方光电科技有限公司 | Display module, display device and control method |
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| CN109755271B (en) * | 2017-11-01 | 2024-01-26 | 北京京东方显示技术有限公司 | Display substrate, display panel and display device |
| CN108346683B (en) * | 2018-02-09 | 2021-01-05 | 上海天马有机发光显示技术有限公司 | Light-emitting structure, display panel, display device and control method of display panel |
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