OLED display screen structure and display device

Abstract

The utility model discloses an OLED display screen structure and display equipment, and relates to the technical field of OLED display. The OLED display screen structure comprises a cover plate which is oppositely provided with a first surface and a second surface, the first surface of the cover plate is a light-emitting surface of a display screen, and an anode layer, an organic light-emitting layer, a cathode layer and a control device layer are sequentially stacked on the second surface of the cover plate; according to the OLED display screen structure provided by the utility model, the anode layer, the organic light-emitting layer, the cathode layer and the control device layer are directly manufactured on the back surface of the cover plate, so that the bonding process of parts such as a polaroid, an optical transparent adhesive tape and a cover plate of a traditional OLED display screen structure can be omitted, the production efficiency and the overall yield of the OLED display screen are improved, and the production and manufacturing cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to OLED display technical field especially relates to a kind of OLED display screen structure and display equipment. BACKGROUND

[0002] OLED display is organic light emitting diode display, with contrast ratio high, color gamut wide, response speed fast, thin flexible, low power consumption and many other advantages, widely used in smart phone, tablet computer, notebook computer, television and so on, for people bring better visual enjoyment, promote the continuous progress of display technology.

[0003] The OLED display panel structure on the market currently is usually composed of TFT glass, organic light emitting layer, encapsulation glass and polarizing sheet, optical transparent adhesive and topmost cover glass arranged on the encapsulation glass, light will attenuate when passing through each layer of material, the more material layers penetrated, the greater the light loss, affect visual effect, and the bonding process of polarizing sheet, optical transparent adhesive and cover glass has adverse effects on the production efficiency and overall yield of display screen;Some latest technologies such as Eco²OLED technology integrate the function of polarizing sheet into OLED device, replace the core component of traditional display screen, polarizing sheet, by adopting screen laminated structure that can block external light reflection, improve the light transmittance of OLED display panel, but it still needs to bond and encapsulate encapsulation glass and cover glass on TFT glass and organic light emitting layer;Due to the complex manufacturing process of OLED display panel, the requirements for materials and production environment are strict, these traditional bonding processes are easy to have adverse effects on the production efficiency and overall yield of display screen, so that the production cost is high. SUMMARY

[0004] Embodiments of the utility model provide a kind of OLED display screen structure and display equipment, to improve the production efficiency and overall yield of OLED display screen, reduce production cost.

[0005] The OLED display screen structure provided by the utility model comprises:

[0006] Cover plate, first surface and second surface are oppositely arranged, and the first surface is light emitting surface;

[0007] Anode layer, organic light emitting layer, cathode layer and control device layer are sequentially stacked on the second surface.

[0008] Optionally, the anode layer is transparent conductive material.

[0009] Optionally, the organic light emitting layer comprises:

[0010] Hole injection layer, hole transport layer, light emitting material layer, electron transport layer and electron injection layer are sequentially stacked on the anode layer.

[0011] Optionally, the organic light emitting layer is prepared by evaporation or inkjet printing.

[0012] Optionally, the OLED display screen structure further comprises:

[0013] A touch layer is arranged between the second surface and the anode layer.

[0014] Optionally, an insulating layer is arranged between the touch layer and the anode layer.

[0015] Optionally, the OLED display screen structure further comprises:

[0016] An encapsulation layer is arranged outside the anode layer, the organic light emitting layer, the cathode layer and the control device layer.

[0017] The encapsulation layer is an organic polymer material.

[0018] Optionally, a buffer foam or a metal foil is arranged on the outer surface of the encapsulation layer.

[0019] Optionally, the OLED display screen structure further comprises:

[0020] A display driving chip is arranged on the second surface and used for driving the control device layer.

[0021] The display device provided by the utility model comprises a mainboard and the OLED display screen structure, and the mainboard is electrically connected with the OLED display screen structure through a flexible circuit board.

[0022] The utility model has the advantages of:

[0023] The OLED display screen structure can directly manufacture the anode layer, the organic light emitting layer, the cathode layer and the control device layer on the back of the cover plate, so that the bonding process of the polaroid, the optical transparent adhesive and the cover plate of the traditional OLED display screen structure is omitted, the production efficiency and the overall yield of the OLED display screen are improved, and the production manufacturing cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without paying the creativity labor intensity.

[0025] Figure 1 It is a structure schematic view of the OLED display screen structure embodiment of the utility model.

[0026] Figure 2 Figure 2 is a structural schematic diagram of the OLED display screen structure of the present application;

[0027] Figure 3 Figure 1 is a structural schematic diagram of a conventional OLED display screen structure in the prior art.

[0028] Explanation of reference signs:

[0029] 1, cover plate; 2, OLED display device; 3, touch layer; 4, encapsulation layer; 5, display driving chip; 6, flexible circuit board; 21, anode layer; 22, organic light emitting layer; 23, cathode layer; 24, control device layer; 22-1, hole injection layer; 22-2 hole transport layer; 22-3, light emitting material layer; 22-4, electron transport layer; 22-5, electron injection layer. DETAILED DESCRIPTION

[0030] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] The present application provides an OLED display screen structure and display device, aiming to improve the production efficiency and overall yield of the OLED display screen and reduce the production cost.

[0032] Referring to Figure 1 and Figure 2 In an embodiment, the OLED display screen structure provided by the present application comprises:

[0033] The cover plate 1 is oppositely provided with a first surface and a second surface, and the first surface is a light emitting surface;

[0034] The OLED display device 2 provided on the second surface comprises an anode layer 21, an organic light emitting layer 22, a cathode layer 23 and a control device layer 24 which are sequentially stacked on the second surface.

[0035] In the embodiment, the cover plate 1 simultaneously serves as a surface protection layer of the OLED display screen structure and a substrate for preparing the anode layer 21, the organic light-emitting layer 22, the cathode layer 23 and the control device layer 24; as the surface protection layer, the cover plate 1 has high light transmittance and mechanical strength, meeting the visibility and safety of the display screen; as the substrate, the second surface of the cover plate 1 has high flatness and the cover plate 1 has good thermal stability and chemical stability, meeting the requirements of depositing the anode layer 21, the organic light-emitting layer 22, the cathode layer 23 and the control device layer 24.

[0036] In some embodiments, the cover plate 1 is made of tempered glass, which has high hardness and can withstand a large impact force, has excellent light extraction effect and well protects the internal devices of the display screen; in some other embodiments, the cover plate 1 can be made of transparent plastic materials such as polycarbonate (PC), polymethyl methacrylate (PMMA) and the like, to prepare a flexible OLED display screen.

[0037] In the embodiment, the anode layer 21, the organic light-emitting layer 22, the cathode layer 23 and the control device layer 24 are sequentially deposited on the second surface of the cover plate 1.

[0038] The anode layer 21 is made of transparent conductive material, which is used for uniformly injecting current into the organic light-emitting layer 22 and ensuring that the light emitted by the organic light-emitting layer 22 can be emitted through the cover plate; the anode layer 21 can be made of transparent metal oxide semiconductor materials such as indium oxide-based, tin oxide-based and zinc oxide-based, for example, indium tin oxide (ITO), which can be deposited by magnetron sputtering, evaporation or chemical vapor deposition; the anode layer 21 can also be made of some metal nanomaterials (such as silver nanowires and copper nanowires) with high light transmittance in the visible light range, carbon-based materials (such as graphene and carbon nanotubes) and conductive polymers.

[0039] The organic light-emitting layer 22 includes a hole injection layer 22-1, a hole transport layer 22-2, a light-emitting material layer 22-3, an electron transport layer 22-4 and an electron injection layer 22-5, which are sequentially stacked on the anode layer and can be prepared by evaporation or inkjet printing; the evaporation of the organic light-emitting layer has high film formation quality, high pattern precision and wide material selection, which is conducive to improving product yield and reducing process risk; the inkjet printing has low equipment cost and can realize large-area preparation, which can further improve production efficiency and has more obvious cost advantage.

[0040] It should be noted that the OLED display screen structure proposed in the embodiment is removed from the polarizing plate for the convenience of process implementation, and in some application scenarios, the organic light-emitting layer 22 needs to be specially designed to compensate for the color deviation and contrast reduction that may be caused by the removal of the polarizing plate; those skilled in the art should understand that in some embodiments, the materials and structures of the organic light-emitting layer 22 can be designed by using some OLED technologies that remove the polarizing plate, such as Eco2 OLED technology, and the functions of the polarizing plate are integrated into the organic light-emitting layer 22.

[0041] The cathode layer 23 and the anode layer 21 together serve to uniformly inject current into the organic light-emitting layer 22, and the material of the cathode layer 23 can be selected as a transparent conductive material or a metal film, which can be deposited by magnetron sputtering, evaporation or chemical vapor deposition.

[0042] The control device layer 24 includes a thin film transistor (TFT) array for accurately controlling the light-emitting state of each pixel in the organic light-emitting layer 22, and the thin film transistor material can be selected from amorphous silicon (a-Si) or low-temperature polysilicon (LTPS), or metal oxide semiconductor material.

[0043] Referring to Figure 3 , Figure 3 The conventional scheme for the OLED display screen structure in the prior art is a typical scheme of AM-OLED rigid stacking, and the OLED display screen structure is usually composed of a buffer protection layer (Tape), a TFT glass (LTPS TFT glass in the figure), Figure 3 an OLED structure (including an anode layer, an organic light-emitting layer and a cathode layer), an encapsulation glass (Cover Glass) and a polarizing plate (POL) provided on the encapsulation glass, optical transparent adhesive (OCA) and the uppermost cover lens (Cover Lens); compared with the scheme, the OLED display screen structure proposed in the embodiment directly manufactures the anode layer 21, the organic light-emitting layer 22, the cathode layer 23 and the control device layer 24 of the OLED display device 2 on the back of the cover plate 1, so that the bonding process of the polarizing plate, the optical transparent adhesive and the cover plate and other components of the conventional OLED display screen structure can be omitted, the production efficiency and the overall yield of the OLED display screen are improved, and the production manufacturing cost is reduced.

[0044] In addition, in some application scenarios, the embodiment of the utility model can improve the display effect of the OLED display screen in combination with the technology of removing the polarizing plate such as Eco2 OLED, and Figure 2 compared with the conventional scheme shown in the figure, the encapsulation glass and the polarizing plate provided on the encapsulation glass are removed, the number of panel layers is reduced, the attenuation degree of light in the transmission process is weakened, the display brightness is improved, and the panel power consumption is reduced.

[0045] Based on the above embodiments, see Figure 1 In some embodiments, in order to realize the touch function of the display device, the OLED display structure proposed in this utility model further includes a touch layer 3.

[0046] Specifically, the touch layer 3 is disposed between the second surface of the cover plate 1 and the anode layer 21; the touch layer circuit is made of transparent conductive material and is prepared by methods such as magnetron sputtering, vapor deposition or chemical vapor deposition, and combined with photolithography to form a complete touch layer circuit pattern.

[0047] Furthermore, an insulating layer is provided between the touch layer 3 and the anode layer 21. Figure 1 (not shown in the image). After the touch layer 3 is fabricated on the second surface of the cover plate 1, an insulating layer is deposited by methods such as magnetron sputtering, vapor deposition or chemical vapor deposition. Then, the anode layer 21, the organic light-emitting layer 22, the cathode layer 23 and the control device layer 24 are sequentially fabricated on the insulating layer to ensure electrical isolation between the touch layer 3 and other functional layers.

[0048] See Figure 1 In some embodiments, the OLED display structure proposed in this invention further includes an encapsulation layer 4, which is disposed outside the anode layer 21, the organic light-emitting layer 22, the cathode layer 23 and the controller layer 24.

[0049] In the embodiment with touch layer 3, encapsulation layer 4 is disposed outside touch layer 3, anode layer 21, organic light-emitting layer 22, cathode layer 23 and controller layer 24.

[0050] Preferably, the encapsulation layer 4 is made of organic polymer material, such as polyimide (PI). Polyimide has excellent mechanical properties, electrical insulation, chemical stability, and high temperature stability. It can be used to seal the OLED display structure to isolate air and moisture, and protect the functional layers and related control circuits from corrosion. During the encapsulation process, the OLED display structure provided in the aforementioned embodiment is first thoroughly cleaned and dusted, and necessary surface strengthening or coating treatment is performed. Quality inspection is conducted to ensure that the cover plate meets the quality inspection standards. Then, the OLED display structure and the polyimide encapsulation material are bonded and encapsulated to completely seal the functional layers and related control circuits, forming a complete OLED display panel.

[0051] It is understandable that, in addition to polyimide, the encapsulation layer 4 material can also be made of resin materials such as epoxy resin, phenolic resin, etc., or other organic polymer materials with good mechanical properties, electrical insulation, chemical stability, and high temperature stability.

[0052] Further, in some embodiments, in order to improve the mechanical performance of the back of the OLED display screen structure, according to the protection requirements of the whole machine, the outer surface of the packaging layer 4 can be provided with a buffer foam or a metal foil (such as a copper foil) and the like.

[0053] Referring to Figure 1 In some embodiments, the OLED display screen structure provided by the utility model further comprises a display driving chip 5, the cover plate 1 can be used as a mounting substrate of the display driving chip 5, and the display driving chip 5 is arranged on the second surface of the cover plate 1 and used for driving the control device layer 24.

[0054] The utility model also provides a display device, and the display device comprises a mainboard and the OLED display screen structure provided by the foregoing embodiments.

[0055] Referring to Figure 1 In some embodiments, the mainboard is electrically connected with the OLED display screen structure through a flexible circuit board 6 (FPC), and is used for supplying power and providing control for each functional layer of the OLED display screen structure and the display driving chip, so as to realize complete display functions.

[0056] In some other embodiments, for some display devices with light and thin requirements and high performance requirements, a "Chip On FPC" mode can be used to directly connect the mainboard chip with the OLED display screen structure, so as to improve the system performance.

[0057] The foregoing display device embodiments comprise all beneficial effects of the foregoing OLED display screen structure embodiments, and will not be described herein.

[0058] As can be seen from the foregoing embodiments, the OLED display screen structure and the display device provided by the utility model directly manufacture the anode layer, the organic light-emitting layer, the cathode layer and the control device layer of the OLED display device on the back of the cover plate, and the bonding process of the polarizing plate, the optical transparent adhesive and the cover plate and the like of the traditional OLED display screen structure is omitted, so that the production efficiency and the overall yield of the OLED display screen can be improved, and the production manufacturing cost can be reduced, which has important promoting significance for the research and production of the new generation of OLED display technology.

[0059] The foregoing embodiments are only used to illustrate the technical solutions of the application, rather than limit the same; although the application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; and the modification or replacement does not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. An OLED display screen structure, characterized in that, The application relates to an OLED display screen structure, which comprises the following parts: a cover plate, which is provided with a first surface and a second surface oppositely, wherein the first surface is a light-emitting surface; an anode layer, an organic light-emitting layer, a cathode layer and a control device layer which are sequentially arranged on the second surface.

2. The OLED display screen structure of claim 1, wherein, The anode layer is made of transparent conductive material.

3. The OLED display screen structure of claim 1, wherein, The organic light-emitting layer comprises: a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer and an electron injection layer which are sequentially arranged on the anode layer.

4. The OLED display screen structure of claim 3, wherein, The organic light-emitting layer is prepared by evaporation or inkjet printing.

5. The OLED display screen structure of claim 1, wherein, Further comprising: a touch layer which is arranged between the second surface and the anode layer.

6. The OLED display screen structure of claim 5, wherein, An insulating layer is arranged between the touch layer and the anode layer.

7. The OLED display screen structure of claim 1, wherein, Further comprising: an encapsulating layer which is arranged outside the anode layer, the organic light-emitting layer, the cathode layer and the control device layer; the encapsulating layer is made of organic polymer material.

8. The OLED display screen structure of claim 7, wherein, The outer surface of the encapsulating layer is provided with buffer foam or metal foil.

9. The OLED display screen structure of claim 1, wherein, Further comprising: a display driving chip which is arranged on the second surface and used for driving the control device layer.

10. A display device, characterized by comprising: The application further relates to a main board and the OLED display screen structure, and the main board is electrically connected with the OLED display screen structure through a flexible circuit board.

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