WO2018010213A1 - 折叠式oled显示器 - Google Patents

折叠式oled显示器 Download PDF

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Publication number
WO2018010213A1
WO2018010213A1 PCT/CN2016/091811 CN2016091811W WO2018010213A1 WO 2018010213 A1 WO2018010213 A1 WO 2018010213A1 CN 2016091811 W CN2016091811 W CN 2016091811W WO 2018010213 A1 WO2018010213 A1 WO 2018010213A1
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Prior art keywords
oled
light emitting
emitting device
electrode
layer
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PCT/CN2016/091811
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English (en)
French (fr)
Inventor
唐岳军
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武汉华星光电技术有限公司
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Priority to US15/125,188 priority Critical patent/US20180219162A1/en
Publication of WO2018010213A1 publication Critical patent/WO2018010213A1/zh

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • 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
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • 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
    • H10K59/128—Active-matrix OLED [AMOLED] displays comprising two independent displays, e.g. for emitting information from two major sides of the display
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/302—Details of OLEDs of OLED structures
    • H10K2102/3023—Direction of light emission
    • H10K2102/3031—Two-side emission, e.g. transparent OLEDs [TOLED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • 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
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a folded OLED display.
  • the flat display device has many advantages such as thin body, power saving, no radiation, and has been widely used.
  • the existing flat display devices mainly include a liquid crystal display (LCD) and an organic light emitting display (OLED).
  • the OLED display device has excellent characteristics such as self-luminescence, no backlight, high contrast, thin thickness, wide viewing angle, fast response speed, flexible panel, wide temperature range, simple structure and simple process. It is considered to be an emerging application technology for next-generation flat panel displays.
  • the OLED display device generally includes a substrate, an anode disposed on the substrate, a hole injection layer disposed on the anode, a hole transport layer disposed on the hole injection layer, and a light-emitting layer disposed on the hole transport layer.
  • the principle of luminescence of OLED display devices is that semiconductor materials and organic luminescent materials are driven by electric fields, causing luminescence by carrier injection and recombination.
  • an OLED display device generally employs an ITO pixel electrode and a metal electrode as anodes and cathodes of the device, respectively.
  • electrons and holes are injected from the cathode and the anode to the electron transport layer and the hole transport layer, respectively.
  • the holes migrate to the light-emitting layer through the electron transport layer and the hole transport layer, respectively, and meet in the light-emitting layer to form excitons and excite the light-emitting molecules, and the latter emits visible light through radiation relaxation.
  • the prior art proposes a double-sided display OLED display, but the double-sided display OLED display requires two OLED display screens and two corresponding driving systems, which are high in cost and large in size, Conducive to carrying, it is easy to cause display damage during the movement. Moreover, the double-sided display OLED display cannot satisfy the need for the viewer to simultaneously view the scene opposite the display while observing the displayed information.
  • the object of the present invention is to provide a foldable OLED display having a plurality of foldable display surfaces, which can enrich the functions and application scenarios of the OLED display, and meet the needs of multiple viewers to simultaneously view multiple display images, and at the same time make the OLED display more Easy to carry.
  • the present invention provides a folded OLED display, comprising: a flexible substrate, an OLED layer disposed on the flexible substrate, and an encapsulation layer disposed on the OLED layer;
  • the flexible substrate includes at least: a first light emitting region, a second light emitting region, and a folding region between the first light emitting region and the second light emitting region;
  • the OLED layer includes at least: a first OLED light emitting device on the first light emitting region, and a second OLED light emitting device on the second light emitting region;
  • the first OLED light emitting device is one of a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED device
  • the second OLED light emitting device is a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED device.
  • the first OLED light emitting device and the second OLED light emitting device are laminated together by bending the flexible substrate along the folding region.
  • the first OLED light-emitting device and the second OLED light-emitting device each include: a buffer layer disposed on the flexible substrate, a thin film transistor disposed on the buffer layer, a flat layer covering the thin film transistor, and disposed at the a bottom electrode electrically connected to the thin film transistor on the flat layer, an organic light emitting layer disposed on the bottom electrode, a pixel defining layer surrounding the edge of the bottom electrode and a flat layer surrounding the organic light emitting layer And a top electrode disposed on the pixel defining layer and the organic light emitting layer.
  • the first OLED light emitting device is a top emitting OLED device, wherein a bottom electrode is a reflective electrode and a top electrode is a transparent electrode;
  • the second OLED light-emitting device bottom-emitting OLED device has a bottom electrode as a transparent electrode and a top electrode as a reflective electrode.
  • the first OLED light emitting device is a top emitting OLED device, wherein a bottom electrode is a reflective electrode and a top electrode is a transparent electrode;
  • the second OLED light emitting device is a transparent OLED device, and both the bottom electrode and the top electrode are transparent electrodes.
  • the first OLED light emitting device is a bottom emitting OLED device, wherein a bottom electrode is a transparent electrode, and a top electrode is a reflective electrode;
  • the second OLED light emitting device transparent OLED device has a bottom electrode and a top electrode Bright electrode.
  • the thickness of the flexible substrate in the folded region is smaller than the thickness of the flexible substrate in the first light emitting region and the second light emitting region.
  • the material of the encapsulation layer is a combination of one or more of glass, an organic film, an inorganic film, and a metal foil.
  • the material of the encapsulation layer is an organic film, an inorganic film, or a combination of an organic film and an inorganic film, and an encapsulation layer above the folding region is attached to the flexible substrate.
  • a connection trace is further disposed on the folding area, and the first OLED light emitting device and the second OLED light emitting device are connected together through a connection trace.
  • the first OLED light emitting device and the second OLED light emitting device are controlled by the same circuit driving system.
  • the present invention also provides a folded OLED display, comprising: a flexible substrate, an OLED layer disposed on the flexible substrate, and an encapsulation layer disposed on the OLED layer;
  • the flexible substrate includes at least: a first light emitting region, a second light emitting region, and a folding region between the first light emitting region and the second light emitting region;
  • the OLED layer includes at least: a first OLED light emitting device on the first light emitting region, and a second OLED light emitting device on the second light emitting region;
  • the first OLED light emitting device is one of a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED device
  • the second OLED light emitting device is a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED device.
  • the first OLED light emitting device and the second OLED light emitting device are laminated together by bending the flexible substrate along the folding region;
  • the first OLED light emitting device and the second OLED light emitting device each include: a buffer layer disposed on the flexible substrate, a thin film transistor disposed on the buffer layer, and a flat layer covering the thin film transistor; a bottom electrode electrically connected to the thin film transistor on the flat layer, an organic light emitting layer disposed on the bottom electrode, a pixel disposed on an edge of the bottom electrode and a flat layer surrounding the organic light emitting layer Defining a layer, and a top electrode disposed on the pixel defining layer and the organic light emitting layer;
  • the material of the encapsulation layer is a combination of one or more of glass, an organic film, an inorganic film, and a metal foil.
  • the present invention provides a folded OLED display including: a flexible substrate, an OLED layer disposed on the flexible substrate, and an encapsulation layer disposed on the OLED layer,
  • the flexible substrate comprises at least: a first hair a light region, a second light emitting region, and a folding region between the first light emitting region and the second light emitting region
  • the OLED layer at least comprising: a first OLED light emitting on the first light emitting region a device, and a second OLED light emitting device on the second light emitting region
  • the first OLED light emitting device is disposed as one of a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED device
  • the second The OLED light emitting device is one of a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED device, and is different from the first OLED light emitting device, so that the folded OLED display has at least two display surfaces, which can enrich the OLED
  • FIG. 1 is a schematic view of a first embodiment of a folded OLED display of the present invention
  • FIG. 2 is a schematic view of a second embodiment of a folded OLED display of the present invention.
  • FIG. 3 is a schematic view of a third embodiment of a folded OLED display of the present invention.
  • FIG. 4 is a schematic view of a fourth embodiment of a folded OLED display of the present invention.
  • FIG. 5 is a schematic view of a first embodiment of a top-emitting OLED device in a foldable OLED display of the present invention
  • FIG. 6 is a schematic view showing a second embodiment of a top-emitting OLED device in a folded OLED display of the present invention.
  • FIG. 7 is a schematic diagram of a bottom-emitting OLED device in a folded OLED display of the present invention.
  • FIG. 8 is a schematic view of a first embodiment of a transparent OLED device in a folded OLED display of the present invention.
  • FIG. 9 is a schematic view showing a second embodiment of a transparent OLED device in a folded OLED display of the present invention.
  • FIG. 10 and FIG. 11 are optical paths of a folded OLED display of the present invention including a top-emitting OLED device and a bottom-emitting OLED device;
  • FIG. 12 is a light path diagram of a folded OLED display of the present invention including a top-emitting OLED device and a transparent OLED device;
  • Figure 13 is a folded OLED display of the present invention comprising a bottom-emitting OLED device and transparent Optical path diagram for OLED devices.
  • the present invention provides a folded OLED display, comprising: a flexible substrate 1, an OLED layer 2 disposed on the flexible substrate 1, and an encapsulation layer 3 disposed on the OLED layer 2;
  • the flexible substrate 1 includes a first light emitting region 11, a second light emitting region 12, and a folding region 13 between the first light emitting region 11 and the second light emitting region 12;
  • the OLED layer 2 includes: a first OLED light emitting device 21 on the first light emitting region 11 and a second OLED light emitting device 22 on the second light emitting region 12;
  • the first OLED light emitting device 21 is one of a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED device
  • the second OLED emitting device 22 is a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED.
  • the first OLED light emitting device 21 and the second OLED light emitting device 22 are laminated together by bending the flexible substrate 1 along the folding region 13.
  • the first OLED light emitting device 21 and the second OLED light emitting device 22 each include: a buffer layer 201 disposed on the flexible substrate 1 and disposed on the buffer layer 201 .
  • a pixel defining layer 207 disposed on the edge of the bottom electrode 204 and the flat layer 203 surrounding the organic light emitting layer 205, and a top electrode 206 disposed on the pixel defining layer 207 and the organic light emitting layer 205.
  • the type and structure of the thin film transistor 202 can be selected according to requirements, such as a single crystal silicon thin film transistor, a low temperature polysilicon thin film transistor, or an oxide semiconductor thin film transistor, and the structure may be a top gate type or a Bottom grid type, or other type.
  • the thin film transistor 202 is a top gate type low temperature polysilicon thin film transistor, and includes an active layer 2021 disposed on the buffer layer 201 and disposed on the active layer 2021 .
  • the bottom electrode 204 is a reflective electrode
  • the top electrode 206 is a transparent electrode.
  • the bottom electrode 204 is a transparent electrode
  • the top electrode 206 is a reflective electrode.
  • the OLED light-emitting device is a transparent OLED device
  • the bottom electrode 204, the organic light-emitting layer 205, and the top electrode 206 of the top-emitting OLED device and the transparent OLED device may extend above the thin film transistor 202 to increase the light-emitting area of a single pixel.
  • the transmittances of the bottom electrode 204 and the top electrode 206 of the transparent OLED device may be different, thereby causing the bottom electrode 204 side and the top electrode 206 side of the transparent OLED device to have different light output intensities.
  • the first OLED light emitting device 21 is a top emitting OLED device
  • the second OLED light emitting device 22 is a bottom emitting OLED device, so that the folded OLED display can be separately from the flexible substrate 1 A different display screen is observed on one side and the encapsulation layer 3 side.
  • the viewing angle of the two display screens can be adjusted by adjusting the angle between the first OLED light emitting device 21 and the second OLED light emitting device 22 . .
  • the first OLED light emitting device 21 is a top emitting OLED device
  • the second OLED light emitting device 22 is a transparent OLED device
  • the folded OLED display can be from the side of the package layer 3
  • the display screen of the first OLED light-emitting device 21 is observed, and the display image of the second OLED light-emitting device 22 is observed from the side of the flexible substrate 1 and the side of the package layer 3, and can also be observed through the second OLED light-emitting device 22.
  • the scene behind the display At this time, the viewing angle of the two display screens can also be adjusted by adjusting the angle between the first OLED light emitting device 21 and the second OLED light emitting device 22.
  • the first OLED light emitting device 21 is a bottom OLED device
  • the second OLED device 22 is transparent OLED device, so that the folded OLED display can observe the first OLED illuminating from the side of the flexible substrate 1
  • the display screen of the device 21 and the display screen of the second OLED light-emitting device 22 are viewed from the flexible substrate 1 side and the package layer 3 side, and the scene behind the display can also be observed through the second OLED light-emitting device 22.
  • the viewing angle of the two display screens can also be adjusted by adjusting the angle between the first OLED light emitting device 21 and the second OLED light emitting device 22.
  • FIG. 2 is a second embodiment of the present invention.
  • the connecting area 23 can also be disposed on the folding area 13 , and the first OLED light emitting device 21 and the second OLED light emitting device 22 are connected together through the connecting line 23 , and can be driven by the same pad area.
  • the first OLED light emitting device 21 and the second OLED light emitting device 22 are connected together through the connecting line 23 , and can be driven by the same pad area.
  • the first OLED light-emitting device 21 and the second OLED light-emitting device 22 pass the same pad. Driving the same driving system; when the pixel sizes of the first OLED light emitting device 21 and the second OLED light emitting device 22 are the same and the pixel light emitting area is different, the first OLED light emitting device 21 and the second OLED emit light Device 22 is driven by two sub-drive systems of the same pad area, respectively.
  • a first embodiment as shown in FIG.
  • connection area 23 is not disposed on the folding area 13 , and the first OLED light emitting device 21 and the second OLED light emitting device 22 are respectively connected to two.
  • the pad area is controlled by two independent drive systems. The position of the pad area can be set as needed, and is not limited to a certain fixed position.
  • the package above the folding area 13 can also be made by using a film encapsulation.
  • the layer 3 is attached to the flexible substrate 1 to reduce the thickness of the folded position.
  • the encapsulation layer 3 above the folding region 13 is attached to the flexible substrate 1, but also the flexible substrate 1 is folded.
  • the thickness of the region 13 is smaller than the thickness of the flexible substrate 1 at the first light-emitting region 11 and the second light-emitting region 12, again reducing the thickness of the folded position.
  • the material of the flexible substrate 1 is a combination of one or more of a flexible glass, an organic thin film, an inorganic thin film, and a metal foil.
  • the material of the encapsulation layer 3 is a combination of one or more of glass, an organic film, an inorganic film, and a metal foil.
  • the material of the encapsulation layer 3 is an organic film, an inorganic film, or a combination of an organic film and an inorganic film.
  • the material thereof is: indium tin oxide, indium zinc oxide, zinc oxide, or indium oxide.
  • the bottom electrode 204 is a reflective electrode, it includes: a reflective layer disposed away from the organic light emitting layer, and a transparent layer disposed adjacent to the organic light emitting layer, wherein the reflective layer is made of silver, magnesium, aluminum, An alloy of one or more of platinum, palladium, gold, nickel, ruthenium, iridium, and chromium or a compound thereof, and the material of the transparent layer is: indium tin oxide, indium zinc oxide, zinc oxide, or indium oxide.
  • the top electrode 206 When the top electrode 206 is a transparent electrode, it comprises an intermediate layer, and an auxiliary electrode or a bus electrode line formed by using the intermediate layer, wherein the material of the intermediate layer is a combination of lithium, calcium, aluminum, magnesium, lithium fluoride and calcium, or A combination of lithium fluoride and aluminum, or a compound of the above materials, wherein the auxiliary electrode or the bus electrode wire is made of indium tin oxide, indium zinc oxide, zinc oxide, or indium oxide.
  • the top electrode 206 When the top electrode 206 is a reflective electrode, the material thereof is lithium, calcium, aluminum, magnesium, and fluorination. A combination of lithium and calcium, a combination of lithium fluoride and aluminum, a compound of the above materials, or an alloy of the above materials.
  • the thin film transistor 202, the flat layer 203, and the organic light emitting layer 205 in the first OLED light emitting device 21 and the second OLED light emitting device 22 can be simultaneously fabricated, and the materials of the top electrode 206 and the bottom electrode 204 are the same.
  • the first OLED light emitting device 21 and the organic light emitting layer 205 of the second OLED light emitting device 22 are simultaneously fabricated, so that the first OLED light emitting device 21 and the second OLED light emitting device 22 are simultaneously fabricated.
  • the luminescent materials are the same.
  • the illuminating intensity per unit area is the same, and thus the organic luminescent layer 205 of the first OLED illuminating device 21 and the second OLED illuminating device 22 can be adjusted.
  • the area, the size of the electrical signal, and the reflectivity of the reflective layer enable the transparent OLED device to display a better picture effect.
  • the folding zone 13 when the folding zone 13 has a large width (greater than 5 mm) and is not easily positioned accurately, the folding zone 13 can be shaped by other auxiliary means such as a casing or the like.
  • the present invention is not limited to including only two OLED display devices and one folding region, and more light emitting regions and folding regions can be disposed on the flexible substrate 1, and correspondingly formed on the respective light emitting regions.
  • the widths of the respective folding regions may be set to be the same or different as needed, and the bending directions of the respective folding regions may be the same or different, for example, when there are three light-emitting regions and two folding regions arranged in the horizontal direction.
  • the width of the two folding regions can be set to be the same, and the left light-emitting area is folded onto the upper surface of the middle light-emitting area, and the right light-emitting area is folded onto the lower surface of the middle light-emitting area to realize three light-emitting areas.
  • Folding it is also possible to set the width of the left folding area to be larger than the width of the right folding area, and first fold the right lighting area onto the upper surface of the middle lighting area, and then fold the left folding area to the right side of the lighting area. On the upper surface, the folding of the three illuminating regions is achieved.
  • Other technical features including the selection of the type of the OLED display device, the setting of the connection line of the folding area, the manner of reducing the thickness of the folding area, and the selection of various materials are the same as those in the above embodiment, and are not described herein again.
  • the present invention provides a folded OLED display comprising: a flexible substrate, an OLED layer disposed on the flexible substrate, and an encapsulation layer disposed on the OLED layer, wherein
  • the flexible substrate includes at least: a first illuminating region, a second illuminating region, and a folding region between the first illuminating region and the second illuminating region, where the OLED layer includes at least: a first OLED light emitting device on the first light emitting region, and a second OLED light emitting device on the second light emitting region, and the first OLED light emitting device is disposed as a top emitting OLED device, a bottom emitting OLED device, and a transparent One of the OLED devices, the second OLED light emitting device being one of a top emitting OLED device, a bottom emitting OLED device, and a transparent OLED device, and different from the first OLED emitting device, thereby
  • the folding OLED display has at least two display surfaces, can enrich the functions and application scenarios of the

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Abstract

一种折叠式OLED显示器，包括：柔性基板(1)、设于柔性基板(1)上的OLED层(2)、以及设于OLED层(2)上的封装层(3)，柔性基板(1)至少包括：一第一发光区(11)、一第二发光区(12)、以及位于第一发光区(11)与第二发光区(12)之间的一折叠区(13)，OLED层(2)至少包括：一位于第一发光区(11)上的第一OLED发光器件(21)、以及一位于第二发光区(12)上的第二OLED发光器件(22)，所述第一OLED发光器件(21)和第二OLED发光器件(22)为不同类型的OLED器件，从而使得该折叠式OLED显示器具有至少两个显示面，能够丰富OLED显示器的功能和应用场景，满足不同观众同时观看不同的显示画面的需求。

Description

折叠式OLED显示器 技术领域
本发明涉及显示技术领域，尤其涉及一种折叠式OLED显示器。
背景技术
平面显示器件具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。现有的平面显示器件主要包括液晶显示器件(Liquid Crystal Display，LCD)及有机发光二极管显示器件(Organic Light Emitting Display，OLED)。
有机发光二极管显示器件由于同时具备自发光、不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异特性，被认为是下一代平面显示器的新兴应用技术。
OLED显示器件通常包括：基板、设于基板上的阳极、设于阳极上的空穴注入层、设于空穴注入层上的空穴传输层、设于空穴传输层上的发光层、设于发光层上的电子传输层、设于电子传输层上的电子注入层、及设于电子注入层上的阴极。OLED显示器件的发光原理为半导体材料和有机发光材料在电场驱动下，通过载流子注入和复合导致发光。具体的，OLED显示器件通常采用ITO像素电极和金属电极分别作为器件的阳极和阴极，在一定电压驱动下，电子和空穴分别从阴极和阳极注入到电子传输层和空穴传输层，电子和空穴分别经过电子传输层和空穴传输层迁移到发光层，并在发光层中相遇，形成激子并使发光分子激发，后者经过辐射弛豫而发出可见光。
目前，常规的OLED显示器都只具有一个发光面，观众只能从该发光面观察显示面板，并且该发光面的大小通常是固定不变的。然而在某些应用场景下两个观众可能会需要同时观看不同的信息、节目、或画面或者在观察显示信息时需要同时看到显示器对面的景物，此时观众的需求往往很难满足。针对上述问题，现有技术提出了一种双面显示的OLED显示器，但该双面显示的OLED显示器需要两个OLED显示屏以及两套对应的驱动系统，成本较高，而且尺寸较大，不利于携带，容易在移动过程中产生显示器损坏。而且，双面显示的OLED显示器无法满足观众在观察显示信息时需要同时看到显示器对面的景物的需求。
发明内容
本发明的目的在于提供一种折叠式OLED显示器，具有多个可折叠的显示面，能够丰富OLED显示器的功能和应用场景，满足多个观众同时观察多个显示画面的需求，同时使OLED显示器更容易携带。
为实现上述目的，本发明提供了一种折叠式OLED显示器，包括：柔性基板、设于所述柔性基板上的OLED层、以及设于所述OLED层上的封装层；
所述柔性基板至少包括：一第一发光区、一第二发光区、以及位于所述第一发光区与第二发光区之间的一折叠区；
所述OLED层至少包括：一位于所述第一发光区上的第一OLED发光器件、以及一位于第二发光区上的第二OLED发光器件；
所述第一OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种，所述第二OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种且不同于第一OLED发光器件；
折叠时，通过将所述柔性基板沿所述折叠区弯折使所述第一OLED发光器件与所述第二OLED发光器件层叠到一起。
所述第一OLED发光器件及第二OLED发光器件均包括：设于所述柔性基板上的缓冲层、设于所述缓冲层上的薄膜晶体管、覆盖所述薄膜晶体管的平坦层、设于所述平坦层上与所述薄膜晶体管电性连接的底电极、设于所述底电极上的有机发光层、设于所述底电极的边缘及平坦层上包围所述有机发光层的像素定义层、以及设于所述像素定义层及有机发光层上的顶电极。
所述第一OLED发光器件为顶发光OLED器件，其底电极为反射电极，顶电极为透明电极；
所述第二OLED发光器件底发光OLED器件，其底电极为透明电极，顶电极为反射电极。
所述第一OLED发光器件为顶发光OLED器件，其底电极为反射电极，顶电极为透明电极；
所述第二OLED发光器件透明OLED器件，其底电极和顶电极均为透明电极。
所述第一OLED发光器件为底发光OLED器件，其底电极为透明电极，顶电极为反射电极；
所述第二OLED发光器件透明OLED器件，其底电极和顶电极均为透 明电极。
所述柔性基板在折叠区的厚度小于所述柔性基板在第一发光区和第二发光区的厚度。
所述封装层的材料为玻璃、有机薄膜、无机薄膜、及金属箔中的一种或多种的组合。
所述封装层的材料为有机薄膜、无机薄膜、或有机薄膜与无机薄膜的组合，所述折叠区上方的封装层与所述柔性基板贴合。
所述折叠区上还设有连接走线，所述第一OLED发光器件与所述第二OLED发光器件通过连接走线连接到一起。
所述第一OLED发光器件与所述第二OLED发光器件通过同一个电路驱动系统控制。
本发明还提供一种折叠式OLED显示器，包括：柔性基板、设于所述柔性基板上的OLED层、以及设于所述OLED层上的封装层；
所述柔性基板至少包括：一第一发光区、一第二发光区、以及位于所述第一发光区与第二发光区之间的一折叠区；
所述OLED层至少包括：一位于所述第一发光区上的第一OLED发光器件、以及一位于第二发光区上的第二OLED发光器件；
所述第一OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种，所述第二OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种且不同于第一OLED发光器件；
折叠时，通过将所述柔性基板沿所述折叠区弯折使所述第一OLED发光器件与所述第二OLED发光器件层叠到一起；
其中，所述第一OLED发光器件及第二OLED发光器件均包括：设于所述柔性基板上的缓冲层、设于所述缓冲层上的薄膜晶体管、覆盖所述薄膜晶体管的平坦层、设于所述平坦层上与所述薄膜晶体管电性连接的底电极、设于所述底电极上的有机发光层、设于所述底电极的边缘及平坦层上包围所述有机发光层的像素定义层、以及设于所述像素定义层及有机发光层上的顶电极；
其中，所述封装层的材料为玻璃、有机薄膜、无机薄膜、及金属箔中的一种或多种的组合。
本发明的有益效果：本发明提供了一种折叠式OLED显示器，该折叠式OLED显示器包括：柔性基板、设于所述柔性基板上的OLED层、以及设于所述OLED层上的封装层，其中，所述柔性基板至少包括：一第一发 光区、一第二发光区、以及位于所述第一发光区与第二发光区之间的一折叠区，所述OLED层至少包括：一位于所述第一发光区上的第一OLED发光器件、以及一位于第二发光区上的第二OLED发光器件，并且设置所述第一OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种，所述第二OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种且不同于第一OLED发光器件，从而使得该折叠式OLED显示器具有至少两个显示面，能够丰富OLED显示器的功能和应用场景，满足不同观众同时观看不同的显示画面的需求，并且可以通过将所述柔性基板沿所述折叠区弯折使所述第一OLED发光器件与所述第二OLED发光器件层叠到一起，以便于携带。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为本发明的折叠式OLED显示器的第一实施例的示意图；
图2为本发明的折叠式OLED显示器的第二实施例的示意图；
图3为本发明的折叠式OLED显示器的第三实施例的示意图；
图4为本发明的折叠式OLED显示器的第四实施例的示意图；
图5为本发明的可折叠式OLED显示器中的顶发光OLED器件的第一实施例示意图；
图6为本发明的折叠式OLED显示器中的顶发光OLED器件的第二实施例示意图；
图7为本发明的折叠式OLED显示器中的底发光OLED器件的示意图；
图8为本发明的折叠式OLED显示器中的透明OLED器件的第一实施例示意图；
图9为本发明的折叠式OLED显示器中的透明OLED器件的第二实施例示意图；
图10和图11为本发明的折叠式OLED显示器包含顶发光OLED器件和底发光OLED器件时的光路图；
图12为本发明的折叠式OLED显示器包含顶发光OLED器件和透明OLED器件时的光路图；
图13为本发明的折叠式OLED显示器包含底发光OLED器件和透明 OLED器件时的光路图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1，本发明提供一种折叠式OLED显示器，包括：柔性基板1、设于所述柔性基板1上的OLED层2、以及设于所述OLED层2上的封装层3；
所述柔性基板1包括：一第一发光区11、一第二发光区12、以及位于所述第一发光区11与第二发光区12之间的一折叠区13；
所述OLED层2包括：一位于所述第一发光区11上的第一OLED发光器件21、以及一位于第二发光区12上的第二OLED发光器件22；
所述第一OLED发光器件21为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种，所述第二OLED发光器件22为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种且不同于第一OLED发光器件21；
折叠时，通过将所述柔性基板1沿所述折叠区13弯折使所述第一OLED发光器件21与所述第二OLED发光器件22层叠到一起。
具体地，请参阅图5至图9，所述第一OLED发光器件21及第二OLED发光器件22均包括：设于所述柔性基板1上的缓冲层201、设于所述缓冲层201上的薄膜晶体管202、覆盖所述薄膜晶体管202的平坦层203、设于所述平坦层203上与所述薄膜晶体管202电性连接的底电极204、设于所述底电极204上的有机发光层205、设于所述底电极204的边缘及平坦层203上包围所述有机发光层205的像素定义层207、以及设于所述像素定义层207及有机发光层205上的顶电极206。
需要说明的是，所述薄膜晶体管202的类型和结构可以根据需要进行选择，如单晶硅薄膜晶体管、低温多晶硅薄膜晶体管、或氧化物半导体薄膜晶体管等，结构可以是顶栅型，也可以是底栅型、或其他类型。优选地，如图5至图9所示，所述薄膜晶体管202为顶栅型低温多晶硅薄膜晶体管，包括：设于所述缓冲层201上的有源层2021、设于所述有源层2021及缓冲层201上的栅极绝缘层2022、设于有源层2021上的栅极绝缘层2022上的栅极2024，设于所述栅极2024及栅极绝缘层2022上的层间绝缘层2023、设于所述层间绝缘层2023上的源极2025与漏极2026，其中所述源极2025与漏极2026通过贯穿所述层间绝缘层2023和栅极绝缘层2022的过孔与所 述有源层2021的两端接触，所述底电极204通过贯穿所述平坦层203的过孔与所述漏极2026相接触。
具体地，请参阅图5和图6，当所述OLED发光器件为顶发光OLED器件时，其底电极204为反射电极，顶电极206为透明电极，请参阅图7，当所述OLED发光器件为底发光OLED器件时，其底电极204为透明电极，顶电极206为反射电极，请参阅图8和图9，当所述OLED发光器件为透明OLED器件时，其底电极204和顶电极206均为透明电极。其中，请参阅图6和图8，顶发光OLED器件和透明OLED器件的底电极204、有机发光层205、及顶电极206可以延伸到薄膜晶体管202的上方，以增大单一像素的发光面积。并且透明OLED器件的底电极204和顶电极206的透过率可以不同，进而使得透明OLED器件的底电极204侧和顶电极206侧具有不同的出光强度。
可选地，请参阅图10，所述第一OLED发光器件21为顶发光OLED器件，所述第二OLED发光器件22为底发光OLED器件，从而所述折叠式OLED显示器可分别从柔性基板1一侧和封装层3一侧观察到不同的显示画面，同时请参阅图11，可以通过调整第一OLED发光器件21与第二OLED发光器件22之间的夹角来调整两显示画面的观看角度。
可选地，请参阅图12，所述第一OLED发光器件21为顶发光OLED器件，所述第二OLED发光器件22为透明OLED器件，从而所述折叠式OLED显示器可从封装层3一侧观察到第一OLED发光器件21的显示画面，并从柔性基板1一侧和封装层3一侧观察到第二OLED发光器件22的显示画面，同时还可以透过第二OLED发光器件22观察到显示器后的景物。此时同样可以通过调整第一OLED发光器件21与第二OLED发光器件22之间的夹角来调整两显示画面的观看角度。
可选地，所述第一OLED发光器件21为底发光OLED器件，所述第二OLED发光器件22透明OLED器件，从而所述折叠式OLED显示器可从柔性基板1一侧观察到第一OLED发光器件21的显示画面，并从柔性基板1一侧和封装层3一侧观察到第二OLED发光器件22的显示画面，同时还可以透过第二OLED发光器件22观察到显示器后的景物。此时同样可以通过调整第一OLED发光器件21与第二OLED发光器件22之间的夹角来调整两显示画面的观看角度。
值得一提，请参阅图2，图2为本发明的第二实施例，为了减少集成电路数量、焊盘数量、以及焊接(bonding)制程的次数，进而节约成本，当所述第一OLED发光器件21和第二OLED发光器件22的像素尺寸相同时， 所述折叠区13上还可以设置连接走线23，通过连接走线23将所述第一OLED发光器件21与所述第二OLED发光器件22连接到一起，进而可以通过同一个焊盘区驱动所述第一OLED发光器件21与所述第二OLED发光器件22。优选地，当所述第一OLED发光器件21和第二OLED发光器件22的像素尺寸及像素区发光面积均相同时，所述第一OLED发光器件21和第二OLED发光器件22通过同一焊盘区同一驱动系统进行驱动；当所述所述第一OLED发光器件21和第二OLED发光器件22的像素尺寸相同而像素发光区面积不同时，所述第一OLED发光器件21和第二OLED发光器件22分别通过同一焊盘区的两个子驱动系统进行驱动。当然也可以如图1所示的第一实施例一样，所述折叠区13上不设置连接走线23，所述第一OLED发光器件21与所述第二OLED发光器件22分别连接到两个焊盘区，并分别通过独立的两个驱动系统控制。所述焊盘区的位置可以根据需要进行设置，并不限定于某一固定位置。
进一步地，为了减小折叠位置的厚度，以更加便于折叠，如图3所示，在本发明的第三实施例中，还可以通过采用薄膜封装的方式，使得所述折叠区13上方的封装层3与所述柔性基板1贴合，以减少折叠位置厚度。更进一步地，请参阅图4，在本发明的第四实施例中，不仅使所述折叠区13上方的封装层3与所述柔性基板1贴合，还通过设置所述柔性基板1在折叠区13的厚度小于所述柔性基板1在第一发光区11和第二发光区12的厚度，再次减少折叠位置厚度。
具体地，所述柔性基板1的材料为柔性玻璃、有机薄膜、无机薄膜、及金属箔的一种或多种的组合。所述封装层3的材料为玻璃、有机薄膜、无机薄膜、及金属箔中的一种或多种的组合。采用薄膜封装时，封装层3的材料为有机薄膜、无机薄膜、或有机薄膜与无机薄膜的组合。
具体地，当所述底电极204为透明电极时，其材料为：氧化铟锡、氧化铟锌、氧化锌、或氧化铟。当所述底电极204为反射电极时，其包括：远离所述有机发光层设置的反射层、以及靠近所述有机发光层设置的透明层，其中，反射层的材料为银、镁、铝、铂、钯、金、镍、钕、铱、及铬中的一种或多种的合金或其化合物，透明层的材料为：氧化铟锡、氧化铟锌、氧化锌、或氧化铟。当顶电极206为透明电极时，其包括中间层、及利用中间层形成的辅助电极或汇流电极线，其中中间层的材料为锂、钙、铝、镁、氟化锂和钙的组合、或氟化锂和铝的组合，或上述材料的化合物，所述辅助电极或汇流电极线的材料为氧化铟锡、氧化铟锌、氧化锌、或氧化铟。当所述顶电极206为反射电极时，其材料为锂、钙、铝、镁、氟化 锂和钙的组合、氟化锂和铝的组合、上述材料的化合物、或上述材料的合金。
具体地，所述第一OLED发光器件21和所述第二OLED发光器件22中的薄膜晶体管202、平坦层203、有机发光层205均可以同时制作，顶电极206和底电极204的材料相同时也可同时制作，由于所述第一OLED发光器件21和所述第二OLED发光器件22的有机发光层205同时制作，因此所述第一OLED发光器件21和所述第二OLED发光器件22的发光材料相同，当所述有机发光层205的尺寸和驱动信号相同时，其单位面积发光强度一样，因此可以通过调整第一OLED发光器件21和所述第二OLED发光器件22的有机发光层205的面积、电信号大小、反射层反射率等方式使得透明OLED器件能够显示较好的画面效果。
值得一提的是，当折叠区13有较大宽度(大于5mm)不易准确定位时，折叠区13可以通过其他辅助装置(例如外壳等)限定其形状。
可以理解的是，本发明并不限于仅包含两个OLED显示器件和一个折叠区，还可以在柔性基板1上设置更多的发光区与折叠区，并在各个发光区上相应形成更多的OLED显示器件，各个折叠区的宽度可以根据需要进行设置成相同或不同，各个折叠区的弯折方向可以相同或不同，例如当具有沿水平方向依次排列的三个发光区及两个折叠区时，可以设置两个折叠区的宽度相同，并将左边的发光区折叠到中间的发光区的上表面上，将右边的发光区折叠到中间的发光区的下表面上，实现三个发光区的折叠，还可以设置左边的折叠区的宽度大于右边的折叠区的宽度，并先将右边的发光区折叠到中间的发光区的上表面上，再将左边的折叠区折叠到右边的发光区的上表面上，实现三个发光区的折叠。其余包括OLED显示器件类型的选择、折叠区连接走线的设置、折叠区厚度减小方式、以及各种制作材料的选择等技术特征均与上述实施例相同，此处不再赘述。
综上所述，本发明提供了一种折叠式OLED显示器，该折叠式OLED显示器包括：柔性基板、设于所述柔性基板上的OLED层、以及设于所述OLED层上的封装层，其中，所述柔性基板至少包括：一第一发光区、一第二发光区、以及位于所述第一发光区与第二发光区之间的一折叠区，所述OLED层至少包括：一位于所述第一发光区上的第一OLED发光器件、以及一位于第二发光区上的第二OLED发光器件，并且设置所述第一OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种，所述第二OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种且不同于第一OLED发光器件，从而使得 该折叠式OLED显示器具有至少两个显示面，能够丰富OLED显示器的功能和应用场景，满足不同观众同时观看不同的显示画面的需求，并且可以通过将所述柔性基板沿所述折叠区弯折使所述第一OLED发光器件与所述第二OLED发光器件层叠到一起，以便于携带。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (18)

  1. 一种折叠式OLED显示器，包括：柔性基板、设于所述柔性基板上的OLED层、以及设于所述OLED层上的封装层；
    所述柔性基板至少包括：一第一发光区、一第二发光区、以及位于所述第一发光区与第二发光区之间的一折叠区；
    所述OLED层至少包括：一位于所述第一发光区上的第一OLED发光器件、以及一位于第二发光区上的第二OLED发光器件；
    所述第一OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种，所述第二OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种且不同于第一OLED发光器件；
    折叠时，通过将所述柔性基板沿所述折叠区弯折使所述第一OLED发光器件与所述第二OLED发光器件层叠到一起。
  2. 如权利要求1所述的折叠式OLED显示器，其中，所述第一OLED发光器件及第二OLED发光器件均包括：设于所述柔性基板上的缓冲层、设于所述缓冲层上的薄膜晶体管、覆盖所述薄膜晶体管的平坦层、设于所述平坦层上与所述薄膜晶体管电性连接的底电极、设于所述底电极上的有机发光层、设于所述底电极的边缘及平坦层上包围所述有机发光层的像素定义层、以及设于所述像素定义层及有机发光层上的顶电极。
  3. 如权利要求2所述的折叠式OLED显示器，其中，所述第一OLED发光器件为顶发光OLED器件，其底电极为反射电极，顶电极为透明电极；
    所述第二OLED发光器件底发光OLED器件，其底电极为透明电极，顶电极为反射电极。
  4. 如权利要求2所述的折叠式OLED显示器，其中，所述第一OLED发光器件为顶发光OLED器件，其底电极为反射电极，顶电极为透明电极；
    所述第二OLED发光器件透明OLED器件，其底电极和顶电极均为透明电极。
  5. 如权利要求2所述的折叠式OLED显示器，其中，所述第一OLED发光器件为底发光OLED器件，其底电极为透明电极，顶电极为反射电极；
    所述第二OLED发光器件透明OLED器件，其底电极和顶电极均为透明电极。
  6. 如权利要求1所述的折叠式OLED显示器，其中，所述柔性基板在 折叠区的厚度小于所述柔性基板在第一发光区和第二发光区的厚度。
  7. 如权利要求1所述的折叠式OLED显示器，其中，所述封装层的材料为玻璃、有机薄膜、无机薄膜、及金属箔中的一种或多种的组合。
  8. 如权利要求7所述的折叠式OLED显示器，其中，所述封装层的材料为有机薄膜、无机薄膜、或有机薄膜与无机薄膜的组合，所述折叠区上方的封装层与所述柔性基板贴合。
  9. 如权利要求1所述的折叠式OLED显示器，其中，所述折叠区上还设有连接走线，所述第一OLED发光器件与所述第二OLED发光器件通过连接走线连接到一起。
  10. 如权利要求9所述的折叠式OLED显示器，其中，所述第一OLED发光器件与所述第二OLED发光器件通过同一个电路驱动系统控制。
  11. 一种折叠式OLED显示器，包括：柔性基板、设于所述柔性基板上的OLED层、以及设于所述OLED层上的封装层；
    所述柔性基板至少包括：一第一发光区、一第二发光区、以及位于所述第一发光区与第二发光区之间的一折叠区；
    所述OLED层至少包括：一位于所述第一发光区上的第一OLED发光器件、以及一位于第二发光区上的第二OLED发光器件；
    所述第一OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种，所述第二OLED发光器件为顶发光OLED器件、底发光OLED器件、及透明OLED器件中的一种且不同于第一OLED发光器件；
    折叠时，通过将所述柔性基板沿所述折叠区弯折使所述第一OLED发光器件与所述第二OLED发光器件层叠到一起；
    其中，所述第一OLED发光器件及第二OLED发光器件均包括：设于所述柔性基板上的缓冲层、设于所述缓冲层上的薄膜晶体管、覆盖所述薄膜晶体管的平坦层、设于所述平坦层上与所述薄膜晶体管电性连接的底电极、设于所述底电极上的有机发光层、设于所述底电极的边缘及平坦层上包围所述有机发光层的像素定义层、以及设于所述像素定义层及有机发光层上的顶电极；
    其中，所述封装层的材料为玻璃、有机薄膜、无机薄膜、及金属箔中的一种或多种的组合。
  12. 如权利要求11所述的折叠式OLED显示器，其中，所述第一OLED发光器件为顶发光OLED器件，其底电极为反射电极，顶电极为透明电极；
    所述第二OLED发光器件底发光OLED器件，其底电极为透明电极， 顶电极为反射电极。
  13. 如权利要求11所述的折叠式OLED显示器，其中，所述第一OLED发光器件为顶发光OLED器件，其底电极为反射电极，顶电极为透明电极；
    所述第二OLED发光器件透明OLED器件，其底电极和顶电极均为透明电极。
  14. 如权利要求11所述的折叠式OLED显示器，其中，所述第一OLED发光器件为底发光OLED器件，其底电极为透明电极，顶电极为反射电极；
    所述第二OLED发光器件透明OLED器件，其底电极和顶电极均为透明电极。
  15. 如权利要求11所述的折叠式OLED显示器，其中，所述柔性基板在折叠区的厚度小于所述柔性基板在第一发光区和第二发光区的厚度。
  16. 如权利要求11所述的折叠式OLED显示器，其中，所述封装层的材料为有机薄膜、无机薄膜、或有机薄膜与无机薄膜的组合，所述折叠区上方的封装层与所述柔性基板贴合。
  17. 如权利要求11所述的折叠式OLED显示器，其中，所述折叠区上还设有连接走线，所述第一OLED发光器件与所述第二OLED发光器件通过连接走线连接到一起。
  18. 如权利要求17所述的折叠式OLED显示器，其中，所述第一OLED发光器件与所述第二OLED发光器件通过同一个电路驱动系统控制。
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