Flexible electroluminescent display screen and electronic display screen system

Abstract

The invention provides a flexible electroluminescent display screen and an electronic display screen system.The flexible electroluminescent display screen comprises a light blocking layer, a lower substrate, a lower UV resin curing layer, a lower conducting layer, an electroluminescent layer, a transparent conducting layer, an upper conducting layer, an upper UV resin curing layer and an upper substrate which are sequentially arranged in an overlapped mode; a plurality of luminous points are arranged on the electroluminescent layer; the plurality of light-emitting points are arranged at intervals, and any light-emitting point has one of red, green and blue colors; the red, green and blue light-emitting points are combined to form a pixel point; the flexible electroluminescent display screen is provided with a plurality of pixel points; the lower conducting layer and the upper conducting layer are used for providing control voltage for the electroluminescent layer, and the electroluminescent layer is driven by the voltage to emit light. According to the display screen, the electroluminescent materials are driven by low voltage applied by the upper conducting layer and the lower conducting layer to generate light, so that input image information is disassembled into electric signals of three colors of red, green and blue, and the corresponding electroluminescent materials are accurately controlled to emit light respectively, so that image restoration is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic display, and in particular to a flexible electroluminescent display screen and an electronic display screen system. Background Art

[0002] As a key device for information transmission and interaction, the importance of display screens is becoming increasingly prominent. As electronic devices continue to develop towards thinner, more portable, and more wearable, the requirements for the flexibility of display screens are becoming higher and higher. Flexible electroluminescent display screens have emerged as the times require, and have become a research hotspot in the current display technology field.

[0003] At present, the display screens on the market mainly include liquid crystal display screens and organic light-emitting diode display screens. However, the response speed of liquid crystal display screens is relatively slow and the viewing angle is limited; although organic light-emitting diode display screens have advantages such as self-luminescence and high contrast, there is still a lot of room for improvement in flexibility.

[0004] Flexible electroluminescent display combines the advantages of electroluminescent technology and flexible materials, and has the characteristics of being thin, light, bendable, and foldable. It can adapt to various complex shapes and curved surfaces, providing greater freedom for the design of electronic devices; at the same time, flexible electroluminescent display also has excellent display performance such as high brightness, high resolution, and wide color gamut, which can bring users a more excellent visual experience.

[0005] The research and development of flexible electroluminescent displays involves multiple disciplines such as materials science, electronic engineering, and optics. However, the stability, luminous efficiency, and packaging technology of electroluminescent materials are important factors affecting the performance and life of flexible electroluminescent displays, and are currently difficult points that need to be overcome in the industry.

[0006] In summary, the flexible electroluminescent display screen has broad application prospects and market potential, but it still faces some technical challenges. Based on this, the present invention proposes a new flexible electroluminescent display screen and an electronic display screen system. Summary of the invention

[0007] Based on the above description, the present invention provides a flexible electroluminescent display screen and an electronic display screen system to provide a display screen and a corresponding system having excellent display performance such as high brightness, high resolution, wide color gamut, good stability and high luminous efficiency.

[0008] The technical solution of the present invention to solve the above technical problems is as follows: In a first aspect, the present invention provides a flexible electroluminescent display screen, comprising a light-blocking layer, a lower substrate, a lower UV resin curing layer, a lower conductive layer, an electroluminescent layer, a transparent conductive layer, an upper conductive layer, an upper UV resin curing layer and an upper substrate which are stacked in sequence; Wherein, the electroluminescent layer is provided with a plurality of light-emitting points; the plurality of light-emitting points are arranged at intervals, and any of the light-emitting points has one of the three colors of red, green and blue; the light-emitting points of the three different colors of red, green and blue are combined to form a pixel point; the flexible electroluminescent display screen has a plurality of pixel points; The lower conductive layer and the upper conductive layer are used to provide a control voltage for the electroluminescent layer, so as to drive the electroluminescent layer to emit light by the voltage.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the lower substrate and the upper substrate are both transparent flexible substrates.

[0011] Furthermore, a layer of conductive wire grooves transferred by UV resin is formed on the upper side of the lower substrate and the lower side of the upper substrate respectively; Conductive material is plated into the conductive line slot to form a conductive circuit.

[0012] Furthermore, the conductive material is pure aluminum, pure silver, alloy or conductive adhesive.

[0013] Furthermore, the conductive wire groove is formed by manufacturing a conductive wire groove template by using photolithography technology, and then transferring it to the substrate by UV transfer.

[0014] Furthermore, the conductive groove has a width of 5-30 μm and a depth of 3-20 μm; The distance between two adjacent conductive grooves is 5-30 μm.

[0015] Furthermore, the conductive layer is formed on the surface of the conductive wire slot by plating or coating.

[0016] Furthermore, the thickness of the conductive layer is 3-30 μm.

[0017] Furthermore, the conductive grooves on the lower substrate are arranged vertically; The conductive grooves on the upper substrate are arranged in a horizontal direction perpendicular to the longitudinal direction.

[0018] In a second aspect, the present invention provides an electronic display screen system, comprising the flexible electroluminescent display screen as described in the first aspect.

[0019] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The present invention provides a flexible electroluminescent display screen and an electronic display screen system. The flexible electroluminescent display screen comprises a light-blocking layer, a lower substrate, a lower UV resin curing layer, a lower conductive layer, an electroluminescent material, a transparent conductive layer, an upper conductive layer, an upper UV resin curing layer and an upper substrate which are sequentially stacked and arranged; wherein a plurality of light-emitting points are arranged on the electroluminescent material; the plurality of light-emitting points are arranged at intervals, and any light-emitting point has one of three colors of red, green and blue; the light-emitting points of the three different colors of red, green and blue are combined to form a pixel point; the flexible electroluminescent display screen has a plurality of pixel points; the lower conductive layer and the upper conductive layer are used to provide a control voltage for the electroluminescent material, and the voltage is used to drive the electroluminescent material to emit light.

[0020] Compared with existing methods, this scheme has the following advantages: The present invention is committed to providing a flexible electroluminescent display screen prepared by means of photolithography technology, UV transfer technology, coating technology and composite technology, and combined with electroluminescent materials. The flexible electroluminescent display screen relies on the voltage applied by the upper and lower conductive layers to drive the electroluminescent material to generate light. Specifically, a pixel point is composed of three different colors of red, green and blue light points, and then a rich variety of colors are presented through the combination of different pixel points. This type of flexible display screen can be composed of 1080, 20000, 4000, 8000 or even more pixels according to actual needs. Flexible display screens of different specifications and sizes have different numbers of pixels. In addition, the flexible display screen adopts a low-voltage driving mode. When a voltage of 3-10V is loaded on the upper and lower poles of the electroluminescent material, the electroluminescent material can emit light. At the same time, the input image information will be disassembled into red, green and blue electrical signals, and the corresponding electroluminescent materials will be accurately controlled to emit light, thereby achieving perfect image restoration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the superimposed structure of a flexible electroluminescent display screen provided by an embodiment of the present invention; Figure 2 A schematic diagram of light emission of a flexible electroluminescent display screen provided by an embodiment of the present invention; Figure 3 A schematic diagram of a lower substrate wire trough of a flexible electroluminescent display screen provided by an embodiment of the present invention; Figure 4 A schematic diagram of a metal film coated on the lower substrate of a flexible electroluminescent display screen provided by an embodiment of the present invention; Figure 5 A schematic diagram of a flexible electroluminescent display screen provided in an embodiment of the present invention having a lower substrate metal film with only metal in the wire grooves remaining; Figure 6 A schematic diagram of a conductor groove on an upper substrate of a flexible electroluminescent display screen provided by an embodiment of the present invention; Figure 7 A schematic diagram of a metal film coated on an upper substrate of a flexible electroluminescent display screen provided by an embodiment of the present invention; Figure 8 A schematic diagram of a flexible electroluminescent display screen provided in an embodiment of the present invention having a metal film on an upper substrate with only metal in the wire grooves remaining; Fig. 9 A schematic diagram of an electroluminescent layer on a metal conductive layer of a lower substrate of a flexible electroluminescent display screen provided by an embodiment of the present invention; Fig.10 A schematic diagram of a transparent conductive layer electrode on a metal conductive layer of an upper substrate of a flexible electroluminescent display screen provided by an embodiment of the present invention; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 101, upper substrate; 102, upper UV resin curing layer; 103, upper conductive layer; 104, transparent conductive layer; 105, electroluminescent layer; 106, lower conductive layer; 107, lower UV resin curing layer; 108, lower substrate; 109, light blocking layer. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The following is combined with Figures 1 to 10 The embodiments of the present invention are further described in detail with examples. The following examples are used to illustrate the present invention but cannot be used to limit the scope of the present invention.

[0025] like Figure 1 and Figure 2As shown, this embodiment provides a flexible electroluminescent display screen, including a light-blocking layer 109, a lower substrate 108, a lower UV resin curing layer 107, a lower conductive layer 106, an electroluminescent layer 105, a transparent conductive layer 104, an upper conductive layer 103, an upper UV resin curing layer 102 and an upper substrate 101 which are sequentially stacked from bottom to top.

[0026] Both the lower substrate 108 and the upper substrate 101 are transparent flexible substrates, so that the display screen can be rolled up and bent freely.

[0027] Specifically, the substrate material includes but is not limited to polyimide, polyester film, etc., and the thickness of the upper and lower substrates 108 is 0.05-1 mm.

[0028] Among them, the electroluminescent layer 105 is provided with a plurality of light-emitting points; the plurality of light-emitting points are arranged at intervals, and any light-emitting point has one of the three colors of red, green and blue; the light-emitting points of the three different colors of red, green and blue are combined to form a pixel point; the flexible electroluminescent display screen has a plurality of pixel points.

[0029] The transparent conductive layer 104 is an ITO transparent conductive layer 104 .

[0030] The lower conductive layer 106 and the upper conductive layer 103 are used to provide a control voltage for the electroluminescent layer 105, so as to drive the electroluminescent material to emit light with the voltage.

[0031] In an optional embodiment, if Figure 3 As shown, a layer of conductive line grooves transferred by UV resin is formed on the upper side of the lower substrate 108; Figure 6 As shown, a layer of conductive line grooves transferred by UV resin is formed on the lower side of the upper substrate 101.

[0032] like Figure 4 and Figure 7 As shown, metal films are plated on the upper and lower substrates 108 respectively.

[0033] like Figure 5 and Figure 8 As shown, the metal film of the substrate only leaves the metal in the wire groove, and the conductive wire groove is plated with conductive material to form a conductive circuit.

[0034] That is, a layer of UV resin transfer conductive line groove is formed on one side of the upper and lower substrates, and the conductive line groove is plated with conductive material. The conductive line groove forms a base groove for the conductive material, so that the conductive material can effectively form a conductive circuit. The upper and lower conductive layers 106 provide control voltage for the electroluminescent material.

[0035] The conductive layer has countless conductive circuits, and the number of conductive circuits is determined by the size and pixels of the flexible display.

[0036] Preferably, in some examples, the conductive material is pure aluminum, pure silver, alloy or conductive adhesive, which is not specifically limited.

[0037] The conductive wire groove is formed by using photolithography technology to make a conductive wire groove template, and then transferring it to the substrate by UV transfer.

[0038] Specifically, the conductive groove template of the photoresist plate is transferred to the UV film through UV transfer technology to make a UV film template. The UV film template is attached to the plate roller of the UV molding equipment, and the conductive groove is transferred to the flexible substrate of the flexible electroluminescent display screen through the UV molding machine.

[0039] Preferably, the grayscale lithography machine designs the conductive grooves of the flexible electroluminescent display screen on the photoresist board, and the width of the conductive grooves is 5-30 μm, the depth is 3-20 μm, and the spacing between two adjacent conductive grooves is 5-30 μm. The specific settings can be set according to actual needs, that is, the width, depth, spacing, and length of the conductive grooves are ultimately determined according to the display pixels and sizes of different flexible electroluminescent display screens.

[0040] The conductive layer is formed on the surface of the conductive wire slot by plating or coating.

[0041] Correspondingly, the thickness of the conductive layer is preferably 3-30 μm.

[0042] Furthermore, the entire surface of the plated or coated substrate has a conductive layer, and the conductive layer on the substrate surface is removed by grinding. Since the conductive groove is sunken, the conductive layer of the conductive groove is left after the conductive layer on the substrate surface is removed by grinding.

[0043] A pure metal conductive layer is formed on the upper flexible substrate by wire groove plating, such as Fig.10 As shown, there is an ITO transparent conductive layer 104 on the metal conductive layer of the upper substrate 101 , which can effectively reduce the resistance of the ITO transparent conductive layer 104 .

[0044] Among them, Fig. 9 As shown, there is an electroluminescent layer 105 on the metal conductive layer of the lower substrate 108. The electroluminescent layer 105 is formed of an electroluminescent material. The electroluminescent layer 105 generates an electric field by applying a voltage to two electrodes through the conductive layer. The electrons excited by the electric field hit the luminescent center, causing the electrons to transition, change, and recombine between energy levels to emit light.

[0045] In a specific example, the electroluminescent material can be polyparaphenylene vinylene (PPV) and its derivatives. When voltage is applied through the conductive layer, electrons and holes are injected into the PPV film, and they recombine on the polymer chain to emit light. It can also be CdSe quantum dots. When an electric field is applied, electrons and holes are injected into the quantum dots and recombine inside the quantum dots. It can also be GaN material. After applying a suitable voltage to generate an electric field, electrons and holes recombine in the active region of GaN, causing the electrons to transition between energy levels and emit light.

[0046] In an optional embodiment, the conductive slots on the lower substrate 108 are arranged in a longitudinal direction, and the conductive slots on the upper substrate 101 are arranged in a transverse direction perpendicular to the longitudinal direction. The overlapping positions of the conductive slots on the upper and lower substrates 108 form a control point.

[0047] Specifically, the electroluminescent material is driven to emit light by the voltage of the upper and lower conductive layers 106, and the three different color light points of red, green and blue are combined into a pixel to present different colors. The flexible display screen is composed of 1080, 20000, 4000, 8000 or more pixel points; flexible display screens of different sizes are composed of different numbers of pixel points.

[0048] In summary, compared with the prior art, this embodiment can achieve the following technical effects: The embodiment of the present invention is dedicated to providing a flexible electroluminescent display screen prepared by photolithography technology, UV transfer technology, coating technology and composite technology, and combined with electroluminescent materials. The flexible electroluminescent display screen relies on the voltage applied by the upper and lower conductive layers to drive the electroluminescent material to generate light. Specifically, a pixel point is composed of three different colors of red, green and blue light points, and then a rich variety of colors are presented through the combination of different pixel points. This type of flexible display screen can be composed of 1080, 20000, 4000, 8000 or even more pixel points according to actual needs. Flexible display screens of different specifications and sizes have different numbers of pixel points.

[0049] In addition, the flexible display adopts a low-voltage driving mode. When a voltage of 3-10V is loaded on the upper and lower poles of the electroluminescent material, the electroluminescent material can emit light. At the same time, the input image information will be disassembled into red, green, and blue electrical signals, and the corresponding electroluminescent materials will be accurately controlled to emit light, thereby achieving perfect image restoration.

[0050] In an optional embodiment, further, an electronic display screen system is provided, which includes the flexible electroluminescent display screen as described in the above embodiment. The system also has the beneficial effects of the above display screen, which will not be described in detail here.

[0051] In the description of this specification, the description with reference to the terms "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible electroluminescent display screen, characterized in that: It includes a light-blocking layer, a lower substrate, a lower UV resin curing layer, a lower conductive layer, an electroluminescent layer, a transparent conductive layer, an upper conductive layer, an upper UV resin curing layer and an upper substrate which are sequentially stacked and arranged; Wherein, the electroluminescent layer is provided with a plurality of light-emitting points; the plurality of light-emitting points are arranged at intervals, and any of the light-emitting points has one of the three colors of red, green and blue; the light-emitting points of the three different colors of red, green and blue are combined to form a pixel point; the flexible electroluminescent display screen has a plurality of pixel points; The lower conductive layer and the upper conductive layer are used to provide a control voltage for the electroluminescent layer, so as to drive the electroluminescent layer to emit light by the voltage.

2. The flexible electroluminescent display screen according to claim 1, characterized in that: The lower substrate and the upper substrate are both transparent flexible substrates.

3. The flexible electroluminescent display screen according to claim 2, characterized in that: A layer of conductive line grooves transferred by UV resin is formed on the upper side of the lower substrate and the lower side of the upper substrate respectively; Conductive material is plated into the conductive line slot to form a conductive circuit.

4. The flexible electroluminescent display screen according to claim 3, characterized in that: The conductive material is pure aluminum, pure silver, alloy or conductive glue.

5. The flexible electroluminescent display screen according to claim 3, characterized in that: The conductive wire groove is formed by using photolithography technology to make a conductive wire groove template, and then transferring it to a substrate by UV transfer.

6. The flexible electroluminescent display screen according to claim 5, characterized in that: The conductive groove has a width of 5-30 μm and a depth of 3-20 μm; The distance between two adjacent conductive grooves is 5-30 μm.

7. The flexible electroluminescent display screen according to claim 5, characterized in that: The conductive layer is formed on the surface of the conductive wire slot by plating or coating.

8. The flexible electroluminescent display screen according to claim 7, characterized in that: The thickness of the conductive layer is 3-30 μm.

9. The flexible electroluminescent display screen according to claim 3, characterized in that: The conductive grooves on the lower substrate are arranged vertically; The conductive grooves on the upper substrate are arranged in a transverse direction perpendicular to the longitudinal direction.

10. An electronic display screen system, characterized in that: Comprising the flexible electroluminescent display screen as described in any one of claims 1 to 9.

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