WO2018196279A1 - Oled显示面板及其制备方法、oled显示器 - Google Patents

Oled显示面板及其制备方法、oled显示器 Download PDF

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Publication number
WO2018196279A1
WO2018196279A1 PCT/CN2017/104034 CN2017104034W WO2018196279A1 WO 2018196279 A1 WO2018196279 A1 WO 2018196279A1 CN 2017104034 W CN2017104034 W CN 2017104034W WO 2018196279 A1 WO2018196279 A1 WO 2018196279A1
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Prior art keywords
electrode
display panel
oled display
oled
layer
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PCT/CN2017/104034
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English (en)
French (fr)
Inventor
吴新风
栾梦雨
胡友元
李菲
王欣竹
李慧慧
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Priority to US15/773,571 priority Critical patent/US10546907B2/en
Publication of WO2018196279A1 publication Critical patent/WO2018196279A1/zh
Anticipated expiration legal-status Critical
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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
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • 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
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • 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
    • H10K50/81—Anodes
    • 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
    • H10K50/82—Cathodes
    • 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
    • H10K50/87—Arrangements for heating or cooling
    • 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
    • H10K59/1201—Manufacture or treatment
    • 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
    • H10K59/8794—Arrangements for heating and cooling
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass

Definitions

  • the present disclosure relates to the field of organic light-emitting technology, and more particularly, to an OLED display panel having improved heat dissipation efficiency, a method of fabricating the same, and an OLED display.
  • AMOLED Active Matrix Organic Light Emitting Diode
  • the position of the film layer where the luminescent material is located is between a layer of anode and a layer of cathode, and the light is controlled by the TFT circuit to turn on and off. Due to the essential properties of the material, a certain amount of heat is released during the illuminating process, which may result in Heat is concentrated in the display panel.
  • aspects of the present disclosure provide an OLED display panel and a method of fabricating the same, an OLED display, and an OLED unit.
  • an OLED display panel includes: a scan line extending in a first direction; a data line extending in a second direction perpendicular to the first direction; and an OLED unit including a first electrode, a second electrode, and an organic light emitting layer formed between the first electrode and the second electrode; and a heat conductive layer formed of an insulating heat conductive material connected to the scan line, the data line, and the OLED unit The first electrode in the middle.
  • the first electrode is an anode.
  • the heat conductive layer is formed in a non-light emitting region of the OLED display panel.
  • the first electrode is formed of a transparent conductive material.
  • the heat conducting layer is connected to an edge portion of the first electrode.
  • the OLED display panel further includes: a second heat conduction layer covering the scan line and the data line, respectively.
  • the second heat conducting layer has the same pattern as the scan line and the data line.
  • the heat conducting layer comprises a BeO film.
  • the heat conducting layer is connected to the first electrode through a via.
  • an OLED display includes: an OLED display panel according to any of the embodiments of the present disclosure; a source driver connected to the data line; and a scan driver connected to the scan line.
  • a method of fabricating an OLED display panel includes: forming a scan line extending in a first direction and a data line extending in a second direction perpendicular to the first direction; forming a heat conduction layer, The heat conducting layer is coupled to the scan line and the data line; and forming a first electrode, the first electrode being coupled to the heat conductive layer, wherein the heat conductive layer is formed of an insulating thermally conductive material.
  • the heat conductive layer is formed in a non-light emitting region of the OLED display panel.
  • the first electrode is formed of a transparent conductive material.
  • the heat conducting layer is connected to an edge portion of the first electrode.
  • the method further includes: forming a second heat conduction layer, respectively covering the The scan line and the data line.
  • the second heat conducting layer has the same pattern as the scan line and the data line.
  • the heat conducting layer comprises a BeO film.
  • the heat conductive layer is formed by pyrolysis CVD.
  • the heat conducting layer is connected to the first electrode through a via.
  • an OLED unit includes: a bottom electrode; an organic light emitting layer formed on the bottom electrode; and a transmissive electrode formed on the organic light emitting layer and located in a light emitting region of the OLED unit And a heat conducting layer formed in the non-light emitting region of the OLED unit and connected to the transmissive electrode, the heat conducting layer being formed of an insulating heat conductive material.
  • the heat conducting layer comprises a BeO film.
  • the heat conducting layer is connected to the transmissive electrode through a via.
  • FIG. 1 is a schematic plan view of an OLED display panel in accordance with an embodiment of the present disclosure
  • FIG. 2 is a schematic block diagram of a process of preparing an OLED display panel according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of one pixel in an OLED display panel in accordance with an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of one pixel in an OLED display panel according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic plan view of an OLED display panel according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic cross-sectional view of an OLED unit in accordance with an embodiment of the present disclosure.
  • an OLED display panel In order to enable a person skilled in the art to better understand the technical solutions of the present disclosure, an OLED display panel, a method for fabricating the same, an OLED display, and an OLED unit provided by the present disclosure are further described in detail below with reference to the accompanying drawings and specific embodiments.
  • an OLED display panel in accordance with an embodiment of the present disclosure includes a first substrate 101, a second substrate 102, a data line 103, and a scan line 104.
  • the first substrate 101 may be a back plate of the OLED display panel. Although not shown, the first substrate 101 may include an array substrate of a thin film transistor (TFT) array, and the first substrate 101 may include various circuit structures and / or substrate structure.
  • TFT thin film transistor
  • the second substrate 102 is disposed opposite to the first substrate.
  • a circuit structure such as an organic light-emitting layer or a cathode layer may be formed on the second substrate 102.
  • a circuit structure such as a TFT array, a data line, a scan line, and an anode layer on the first substrate 101
  • a circuit structure such as an organic light-emitting layer and a cathode layer is formed on the second substrate 102, and then the first substrate 101 and the second substrate are formed.
  • the 102 are aligned with each other to form an OLED display panel.
  • first substrate 101 and second substrate 102 are merely examples, and the present disclosure is not limited thereto.
  • the first substrate 101 and the second substrate 102 may not be limited to the above structure, and for example, a TFT array, an anode layer, an organic light emitting layer, a cathode layer, or the like may be formed on the first substrate 101, in which case the second substrate 102 can be a package substrate or a package film.
  • other circuit structures, substrate structures, or package structures may also be included in the OLED display panel, and details are not described herein again.
  • the scan line 104 is formed on the first substrate and extends in a first direction (for example, a horizontal direction).
  • the data line 103 is formed on the first substrate and extends in a second direction (eg, a vertical direction) perpendicular to the first direction.
  • the OLED unit may be formed by a region where the scan line 104 intersects the data line 103 (for example, the OLED unit may constitute a pixel unit of the display panel), and the OLED unit is connected to the scan line 104 and the data line 103, respectively.
  • the scan signal and the data signal are received from the scan line 104 and the data line 103, respectively.
  • the OLED unit may include a driving circuit and an organic light emitting diode (OLED), wherein the driving circuit may be connected to the scan line 104, and the OLED may be connected to the data line 103.
  • the OLED unit (specifically, the OLED portion thereof) may include a first electrode, a second electrode, and an organic light emitting layer formed between the first electrode and the second electrode, wherein the first electrode may be connected to the data line 104.
  • the second electrode may be formed by a common electrode film layer in the OLED display panel.
  • the structures of the OLED unit and the OLED are not described in detail, those skilled in the art can understand on the basis of the present disclosure that the present disclosure can be applied to OLED units of various structures.
  • a plurality of driving elements and compensation elements such as a TFT, a capacitor, and the like may be included, and in the OLED portion of the OLED unit, in addition to the first electrode, the organic light emitting layer, and the second electrode, Various functional layers such as a hole transport layer, a hole injection layer, an electron transport layer, an electron injection layer, and the like.
  • An optical structure may also be included or added to the OLED unit to improve its illuminating effect, and embodiments of the present disclosure are not limited thereto.
  • the scan lines 104 and the data lines 103 are formed in different layers on the first substrate 101, respectively.
  • the scan line 104 is connected to the gate of the switching transistor of each pixel to control the turn-on and turn-off of the switching transistor (ie, select a particular pixel or row of pixels) with the scan signal.
  • the data line 103 is connected to a first electrode (eg, an anode) of an organic light emitting diode (OLED) in each pixel to provide a data signal to the OLED to control the light emitted by the OLED.
  • a first electrode eg, an anode
  • OLED organic light emitting diode
  • the OLED display panel may further include a heat conducting layer (not shown in FIG. 1, see the specific embodiment below), the heat conducting layer is formed of an insulating heat conductive material, connected to the scan line 104, the The data line 103 and the first electrode in the OLED unit (not shown in Figure 1, see the specific embodiment below).
  • An OLED display panel includes: a scan line extending in a first direction; a data line extending in a second direction perpendicular to the first direction; and an OLED unit including a first electrode, a second electrode, and An organic light emitting layer formed between the first electrode and the second electrode; and a heat conductive layer formed of an insulating heat conductive material connected to the scan line, the data line, and the first of the OLED units electrode. Root According to the present disclosure, heat dissipation of the OLED can be improved, thereby avoiding problems such as chromaticity shift of the luminescent light, reduction in luminous efficiency, product attenuation, and the like due to heat generation of the OLED.
  • the process of preparing an OLED display panel may include: preparing a first substrate, wherein the first substrate may be the first substrate 101 as described in the foregoing embodiments, and a person skilled in the art has mastered the preparation method thereof, and thus The specific formation process will not be described here.
  • the step of preparing the first substrate more specifically includes forming a scan line extending in the first direction and a data line extending in a second direction perpendicular to the first direction.
  • the scan line is formed on the first substrate and extends in a first direction (eg, a horizontal direction).
  • the data line is formed on the first substrate and extends in a second direction (eg, a vertical direction) perpendicular to the first direction.
  • a pixel unit may be formed by a region where the scan line intersects the data line, and the pixel unit is respectively connected to the scan line and the data line to receive the scan signal and the data signal from the scan line and the data line, respectively.
  • the process of preparing an OLED display panel may further include: forming a heat conduction layer on the first substrate, the heat conduction layer being connected to the scan line and the data line, wherein the heat conduction layer is formed of an insulating heat conductive material; and forming the first An electrode, the first electrode being connected to the heat conducting layer.
  • the OLED display panel prepared according to the above process includes: a scan line extending in a first direction; a data line extending in a second direction perpendicular to the first direction; and an OLED unit including a first electrode and a second electrode, And an organic light emitting layer formed between the first electrode and the second electrode; and a heat conductive layer formed of an insulating heat conductive material connected to the scan line, the data line, and the OLED unit An electrode.
  • heat dissipation of the OLED can be improved, thereby avoiding problems such as chromaticity shift of the luminescent light, reduction in luminous efficiency, product attenuation, and the like due to heat generation of the OLED.
  • the process of preparing an OLED display panel may further include forming an organic light emitting layer on the first electrode, and forming a second electrode on the organic light emitting layer to form an organic light emitting diode.
  • the first electrode may be a reflective electrode
  • the second electrode may be a transmissive Electrode, however, the disclosure is not limited thereto.
  • the first electrode may be a transmissive electrode
  • the second electrode may be a reflective electrode
  • both the first electrode and the second electrode may be transmissive electrodes.
  • a cathode of an OLED is generally formed as a common electrode film layer.
  • a large-area conductive film layer is generally used to form a cathode of an OLED, and a plurality of OLED units may share the cathode.
  • the anode of the OLED is typically connected to the drive circuit, so the anode is typically formed as a separate electrode.
  • the heat dissipation capability of the anode is often inferior to that of the cathode. Therefore, in this embodiment, in order to improve heat dissipation, the first electrode in the OLED display panel is an anode, so that the insulating and thermally conductive layer can help improve the heat dissipation of the anode. ability.
  • the process of preparing an OLED display panel may further include forming a second substrate on the second electrode.
  • the second substrate may be a package substrate or a package film or the like, and the present disclosure is not limited thereto.
  • FIG. 3 is a schematic diagram of one pixel in an OLED display panel in accordance with an embodiment of the present disclosure.
  • the OLED display panel may include: a scan line 104 extending in a first direction; a data line 103 extending in a second direction perpendicular to the first direction; and an OLED unit including a first electrode and a second electrode, And an organic light emitting layer formed between the first electrode and the second electrode; and a heat conductive layer 105 formed of an insulating heat conductive material connected to the scan line, the data line, and the OLED unit The first electrode 107.
  • the pixel unit mainly includes a driving transistor and an organic light emitting diode.
  • the gate of the driving transistor is connected to the scan line 104
  • the source of the driving transistor is connected to the data line 103
  • the drain of the driving transistor is connected to the first electrode 107 of the organic light emitting diode.
  • the drive transistor controls conduction and turn-off between the data line and the first electrode 107, thereby selectively transmitting the data signal to the first electrode 107.
  • the pixel unit may also include other circuit structures such as an illumination control transistor for controlling OLED illumination and a storage capacitor for storing data signals, and the like. This will not be described in detail in this article.
  • the first electrode 107 may correspond to the The light emitting region of the pixel, and a region other than the first electrode 107 (for example, a region in which a circuit structure such as a driving transistor is formed) may correspond to a non-light emitting region of the pixel.
  • the area of the OLED display panel corresponding to the first electrode of all the pixels is the light emitting area of the OLED display panel, and the area other than the light emitting area corresponds to the non-light emitting area of the OLED display panel.
  • a heat conductive layer 105 is formed in a non-light emitting region of an OLED display panel. In this case, the occlusion of the light by the heat conduction layer 105 can be minimized, thereby avoiding reducing the aperture ratio of the OLED display panel.
  • the heat conducting layer 105 is connected to an edge portion of the first electrode 107.
  • the occlusion of the light-emitting region by the heat-conducting layer 105 can be reduced, thereby ensuring that the occlusion of the light by the heat-conducting layer 105 is minimized, thereby avoiding reducing the aperture ratio of the OLED display panel.
  • the first electrode 107 can form the anode of the OLED for receiving data signals from the data lines. Thereby the OLED is controlled to emit light having a corresponding brightness.
  • the first electrode 107 may be formed of a transparent conductive material such that the OLED may emit light toward the direction of the first electrode 107.
  • the present disclosure is not limited thereto, and the OLED may emit light toward a direction of a second electrode (for example, a cathode of an OLED) as needed, in which case the second electrode may be formed to be transmissive. electrode.
  • the OLED may emit light in two directions, in which case both the first electrode and the second electrode may be formed as a transmissive electrode.
  • the heat conduction layer 105 may be formed in a layer different from the scan line 104, the data line 103, and the first electrode 107, in which case the heat conduction layer 105 may be connected to the scan through the via 106, respectively.
  • the via hole may be formed to have a sufficiently large size and may be formed of an insulating heat conductive material to ensure a sufficient heat transfer rate between the heat conductive layer 105 and the scan line 104, the data line 103, and the first electrode 107.
  • the heat conductive layer 105 is illustrated as including two separate rectangular regions, however, the embodiment is not limited thereto, the heat conductive layer 105 may have other shapes as needed, and the heat conductive layer 105 may be formed to be continuous. Single area.
  • the thermally conductive layer 105 can have a different configuration.
  • 4 is a schematic diagram of one pixel in an OLED display panel in accordance with an embodiment of the present disclosure.
  • an OLED display panel according to a current embodiment of the present disclosure is different from the OLED display panel of FIG. 3 in that the OLED display panel further includes a second heat conduction layer 105 covering the scan line and the Said data line.
  • the second heat conduction layer and the first heat conduction layer are continuously formed and connected to each other, and thus are each represented by the same reference numeral 105.
  • the present disclosure is not limited thereto, and the second heat conduction layer may be formed in a different layer from the first heat conduction layer and connected to each other by using via holes.
  • the second heat conduction layer covers the gate line 104 and the data line 103, respectively, and thus, in this case, the heat conduction layer 105 and the metal line (the gate line 104 and the data line 103) are further enlarged.
  • the contact area enables better utilization of the heat conducting layer and the metal lines to conduct the conduction from the OLED to the outside.
  • the second heat conduction layer has the same pattern as the scan line 104 and the data line 103, and thus the same photolithography process can be used to simultaneously form the second heat conduction layer with the scan line 104 or the data line 103, thereby Improve process efficiency and reduce manufacturing costs.
  • heat generated by the OLED is conducted from the first electrode 107 to the gate line 104 and the data line 103 through the first heat conduction layer 105, and then heat is transferred to the display through the gate line 104 and the data line 105.
  • the heat dissipation structure outside the panel For example, in one embodiment, as shown in FIG. 5, the exterior of the display panel may be further provided with an external heat sink 108, which may be connected to each gate line 104 and each data line 103, and heat from the OLED passes through.
  • the gate line 104 and the data line 103 are conducted to the external heat sink 108 to be guided to the outside of the display panel. Therefore, heat dissipation of the OLED can be improved, thereby avoiding problems such as chromaticity shift of the luminescent light, reduction in luminous efficiency, and product attenuation due to heat generation of the OLED.
  • the heat conducting layer (including the first heat conducting layer and the second heat conducting layer) may be formed of an insulating thermally conductive material, for example, in one embodiment, a BeO film may be used to form the heat conducting layer.
  • the BeO film may have a thermal conductivity close to that of Al and has excellent insulating properties, so it is preferable to use a BeO film to form a heat conducting layer.
  • a BeO film may be formed using a pyrolysis CVD (Chemical Decomposition Chemical Vapor Deposition) method using a salt containing Be ( ⁇ ) as a source material, and is heated and heated in a pyrolysis CVD apparatus. The sublimation is performed to deposit a BeO film on the substrate.
  • a BeO film having a high purity and a good structure of a thin film crystal can be deposited, thereby facilitating improvement of heat dissipation of the OLED.
  • OLED display comprising: an OLED display panel according to any embodiment of the present disclosure; a source driver connected to the data line; and a scan driver connected to the Scan line.
  • the source driver may be a data driver connected to the data line and providing a data signal to the OLED
  • the scan driver may be a gate driver that provides a scan signal to the OLED.
  • FIG. 6 is a schematic cross-sectional view of an OLED unit in accordance with an embodiment of the present disclosure.
  • the OLED unit includes: a bottom electrode 610; an organic light emitting layer 620 formed on the bottom electrode; and a transmissive electrode 630 formed on the organic light emitting layer 620 in the light emitting region of the OLED unit; And a heat conducting layer 640 formed in the non-light emitting region of the OLED unit and connected to the transmissive electrode 630, the heat conducting layer being formed of an insulating thermally conductive material.
  • the light emitting region of the OLED unit corresponds to a region where the organic light emitting layer 620 is located (in other words, corresponds to a region where the transmissive electrode 630 is located), and the non-light emitting region corresponds to a region of the OLED unit other than the light emitting region.
  • the bottom electrode 610 may be a reflective electrode to reflect light emitted from the organic light-emitting layer toward the transmissive electrode 630.
  • the present disclosure is not limited thereto, and the bottom electrode 610 may also be formed of a transparent conductive material depending on the light outgoing direction of the OLED unit, thereby being formed as a transmissive electrode.
  • the bottom electrode 610 may be formed on the substrate 600, and the substrate 600 may be an array substrate including a circuit structure such as a TFT array.
  • the heat conducting layer 640 is shown in direct contact with the transmissive electrode 630, However, the present disclosure is not limited thereto, and the heat conduction layer 640 may be formed in a different layer and connected to the transmissive electrode 630 through a via. The heat generated by the OLED can be transferred to the outside through the heat conducting layer 640. A detailed description of the heat conducting layer 640 can be referred to the previous embodiment, and thus will not be described again herein.
  • the heat conductive layer is formed in the non-light emitting region of the display panel or the OLED in the present disclosure, however, in order to realize the connection of the heat conductive layer and the first electrode in the light emitting region, at least a portion of the heat conductive layer may extend to emit light. In the region, this case should still be understood to mean that the heat conducting layer is formed in the non-light emitting region.
  • the OLED display panel may include: a scan line extending in a first direction; a data line extending in a second direction perpendicular to the first direction; and an OLED unit including a first electrode, a second electrode, and an organic light emitting layer formed between the first electrode and the second electrode; and a heat conductive layer formed of an insulating heat conductive material connected to the scan line, the data line, and the OLED unit The first electrode in the middle.
  • heat dissipation of the OLED can be improved, thereby avoiding problems such as chromaticity shift of the luminescent light, reduction in luminous efficiency, product attenuation, and the like due to heat generation of the OLED.

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Abstract

一种有机发光二极管(OLED)显示面板、一种OLED显示器以及一种OLED单元。其中，OLED显示面板包括：扫描线（104），沿第一方向延伸；数据线（103），沿垂直于该第一方向的第二方向延伸；OLED单元，包括第一电极（107）、第二电极、以及形成在该第一电极和该第二电极之间的有机发光层；以及热传导层（105），由绝缘导热材料形成，连接到该扫描线、该数据线以及该单元中的第一电极。

Description

OLED显示面板及其制备方法、OLED显示器
交叉引用
本申请要求于2017年4月24日提交的申请号为201710271495.5的中国专利申请的优先权，该中国专利申请的全部内容通过引用全部并入本文。
技术领域
本公开涉及有机发光技术领域，更具体地讲，本公开涉及一种具有改善了的散热效率的OLED显示面板及其制备方法、OLED显示器。
背景技术
随着显示行业蓬勃发展，主动矩阵有机发光二极管(AMOLED)显示器具有更薄更轻、主动发光(不需要背光源)、无视角问题、高清晰、高亮度、响应快速、能耗低、使用温度范围广、抗震能力强、可实现柔软显示等特点，日益受到市场的青睐。在目前的技术条件下，发光材料极易受到温度的影响，发光色度严重偏移，发光效率大幅度减少，产品寿命也会快速衰减。
随着人们日常需求的多元化和精细化，大尺寸AMOLED显示面板作为电视显示屏等应用的需求量越来越大。而发光材料所在的膜层位置，介于一层阳极与一层阴极之间，通过TFT电路通断来控制发光，由于材料的本质属性，其在发光过程中，释放出一定的热量，可能导致热量在显示面板内聚集。
应当注意，提供在上述背景部分中公开的信息仅用于更好地理解本公开的背景，并且因此可以包含未形成那些本领域技术人员已知的现有技术的信息。
发明内容
本公开的各方面提供了一种OLED显示面板及其制备方法、一种OLED显示器以及一种OLED单元。
根据本公开的一方面，一种OLED显示面板，包括：扫描线，沿第一方向延伸；数据线，沿垂直于所述第一方向的第二方向延伸；OLED单元，包括第一电极、第二电极、以及形成在所述第一电极和所述第二电极之间的有机发光层；以及热传导层，由绝缘导热材料形成，连接到所述扫描线、所述数据线以及所述OLED单元中的第一电极。
可选地，所述第一电极为阳极。
可选地，所述热传导层形成在所述OLED显示面板的非发光区中。
可选地，所述第一电极由透明导电材料形成。
可选地，所述热传导层连接到所述第一电极的边缘部分。
可选地，所述的OLED显示面板，还包括：第二热传导层，分别覆盖所述扫描线和所述数据线。
可选地，所述第二热传导层具有与所述扫描线和所述数据线相同的图案。
可选地，所述热传导层包含BeO薄膜。
可选地，所述热传导层通过过孔连接到所述第一电极。
根据本公开的另一方面，一种OLED显示器，包括：根据本公开任意实施例的OLED显示面板；源驱动器，连接到所述数据线；以及扫描驱动器，连接到所述扫描线。
根据本公开的另一方面，一种OLED显示面板的制备方法，包括：形成沿第一方向延伸的扫描线以及沿垂直于所述第一方向的第二方向延伸的数据线；形成热传导层，所述热传导层连接到所述扫描线和所述数据线；以及形成第一电极，所述第一电极连接到所述热传导层，其中所述热传导层由绝缘导热材料形成。
可选地，所述热传导层形成在所述OLED显示面板的非发光区中。
可选地，所述第一电极由透明导电材料形成。
可选地，所述热传导层连接到第一电极的边缘部分。
可选地，所述的方法还包括：形成第二热传导层，分别覆盖所 述扫描线和所述数据线。
可选地，所述第二热传导层具有与所述扫描线和所述数据线相同的图案。
可选地，所述热传导层包含BeO薄膜。
可选地，所述热传导层通过热解CVD形成。
可选地，所述热传导层通过过孔连接到所述第一电极。
根据本公开的另一方面，一种OLED单元，包括：底电极；有机发光层，形成在所述底电极上；透射电极，形成在所述有机发光层上，位于所述OLED单元的发光区中；以及热传导层，形成在所述OLED单元的非发光区中并连接到所述透射电极，所述热传导层由绝缘导热材料形成。
可选地，所述热传导层包含BeO薄膜。
可选地，所述热传导层通过过孔连接到所述透射电极。
应当理解，前面的一般描述和以下详细描述都仅是示例性和说明性的，而不是用于限制本公开。
本节提供本公开中描述的技术的各种实现或示例的概述，并不是所公开技术的全部范围或所有特征的全面公开。
附图说明
附图是用来提供对本公开的进一步理解，并且构成说明书的一部分，与下面的具体实施方式一起用于解释本公开，但并不构成对本公开的限制。在附图中：
图1是根据本公开一个实施例的OLED显示面板的示意性俯视图；
图2是根据本公开一个实施例的制备OLED显示面板的过程的示意性框图；
图3是根据本公开一个实施例的OLED显示面板中的一个像素的示意图；
图4是根据本公开一个实施例的OLED显示面板中的一个像素的示意图；
图5是根据本公开一个实施例的OLED显示面板的示意性俯视图；以及
图6是根据本公开一个实施例的OLED单元的示意性剖视图。
具体实施方式
为使本领域的技术人员更好地理解本公开的技术方案，下面结合附图和具体实施方式对本公开所提供的一种OLED显示面板及其制备方法、OLED显示器以及OLED单元作进一步详细描述。
图1是根据本公开一个实施例的OLED显示面板的示意性俯视图。参照图1，根据本公开一个实施例的OLED显示面板包括：第一基板101、第二基板102、数据线103、扫描线104。
第一基板101可以是OLED显示面板的背板，虽然未示出，但第一基板101上可以包含薄膜晶体管(TFT)阵列的阵列基板，并且第一基板101根据需要可以包括各种电路结构和/或基板结构。
第二基板102与第一基板相对地设置。第二基板102上可以形成有有机发光层、阴极层等电路结构。通过在第一基板101上形成TFT阵列、数据线、扫描线、阳极层等电路结构，在第二基板102上形成有机发光层、阴极层等电路结构，然后使第一基板101与第二基板102彼此对合，能够形成OLED显示面板。
应该理解，本实施例中的上述第一基板101和第二基板102的结构仅仅是示例，本公开不限于此。第一基板101和第二基板102可以不限于上述结构，例如，TFT阵列、阳极层、有机发光层、阴极层等结构可以均形成在第一基板101上，在这种情况下，第二基板102可以是封装基板或封装薄膜。在其它实施例中，OLED显示面板中还可以包括其它电路结构、基板结构或封装结构，在此将不再赘述。
扫描线104形成在第一基板上，并且沿第一方向(例如，水平方向)延伸。数据线103形成在第一基板上，并且沿垂直于第一方向的第二方向(例如，竖直方向)延伸。通过扫描线104与数据线103交叉的区域可以形成OLED单元(例如，该OLED单元可构成显示面板的像素单元)，OLED单元分别连接到扫描线104和数据线103， 以分别从扫描线104和数据线103接收扫描信号和数据信号。在本实施例中，OLED单元可以包括驱动电路和有机发光二极管(OLED)，其中驱动电路可以连接到扫描线104，OLED可以连接到数据线103。更具体地，OLED单元(具体地其中的OLED部分)可以包括第一电极、第二电极以及形成在第一电极和第二电极之间的有机发光层，其中，第一电极可以连接到数据线104，第二电极可以由OLED显示面板中的共电极膜层形成。
在本实施例中，虽然没有详细地描述OLED单元以及OLED的结构，但本领域技术人员在本公开的基础上能够理解，本公开能够应用于各种结构的OLED单元。例如，在OLED单元的驱动部分中，可以包括多个TFT、电容器等驱动元件和补偿元件，在OLED单元的OLED部分中，除了第一电极、有机发光层、第二电极之外，还可以包括各种功能层，例如空穴传输层、空穴注入层、电子传输层、电子注入层等。OLED单元中还可以包括或附加光学结构，以改善其发光效果，本公开的实施例不限于此。
在OLED显示面板中，通常，扫描线104与数据线103分别形成在第一基板101上的不同的层中。扫描线104连接到各个像素的开关晶体管的栅极，以利用扫描信号控制开关晶体管的导通和截止(即，选择特定的像素或像素行)。数据线103连接到各个像素中的有机发光二极管(OLED)的第一电极(例如阳极)，从而向OLED提供数据信号以控制OLED发出的光。
在本实施例中，OLED显示面板中还可以包括热传导层(图1中未示出，参见下文中的具体实施例)，热传导层由绝缘导热材料形成，连接到所述扫描线104、所述数据线103以及所述OLED单元中的第一电极(图1中未示出，参见下文中的具体实施例)。
根据本公开实施例的OLED显示面板包括：扫描线，沿第一方向延伸；数据线，沿垂直于所述第一方向的第二方向延伸；OLED单元，包括第一电极、第二电极、以及形成在所述第一电极和所述第二电极之间的有机发光层；以及热传导层，由绝缘导热材料形成，连接到所述扫描线、所述数据线以及所述OLED单元中的第一电极。根 据本公开，能够改善OLED的散热，从而避免由于OLED发热而导致的发光色度偏移、发光效率降低、产品衰减等问题。
图2是根据本公开一个实施例的制备OLED显示面板的过程的示意性框图。参照图2，制备OLED显示面板的过程可以包括：制备第一基板，其中，第一基板可以是如前述实施例中所描述的第一基板101，本领域技术人员已经掌握其制备方法，因此其具体的形成过程在这里将不再赘述。
在一个实施例中，制备第一基板的步骤中更具体地包括形成沿第一方向延伸的扫描线以及沿垂直于所述第一方向的第二方向延伸的数据线。扫描线形成在第一基板上，并且沿第一方向(例如，水平方向)延伸。数据线形成在第一基板上，并且沿垂直于第一方向的第二方向(例如，竖直方向)延伸。通过扫描线与数据线交叉的区域可以形成像素单元，像素单元分别连接到扫描线和数据线，以分别从扫描线和数据线接收扫描信号和数据信号。
制备OLED显示面板的过程还可以包括：在第一基板上形成热传导层，所述热传导层连接到所述扫描线和所述数据线，其中所述热传导层由绝缘导热材料形成；以及形成第一电极，所述第一电极连接到所述热传导层。
利用以上工艺，在OLED显示面板的第一基板上形成了根据本公开的前述实施例所示的结构。因此，根据以上工艺制备的OLED显示面板包括：扫描线，沿第一方向延伸；数据线，沿垂直于所述第一方向的第二方向延伸；OLED单元，包括第一电极、第二电极、以及形成在所述第一电极和所述第二电极之间的有机发光层；以及热传导层，由绝缘导热材料形成，连接到所述扫描线、所述数据线以及所述OLED单元中的第一电极。根据本公开，能够改善OLED的散热，从而避免由于OLED发热而导致的发光色度偏移、发光效率降低、产品衰减等问题。
制备OLED显示面板的过程还可以包括：在第一电极上形成有机发光层、以及在有机发光层上形成第二电极，以形成有机发光二极管。在本实施例中，第一电极可以是反射电极，第二电极可以是透射 电极，然而本公开不限于此。根据OLED显示面板的实际出光需要，第一电极可以是透射电极，第二电极可以是反射电极，或者第一电极和第二电极均可以是透射电极。
在OLED显示面板中，通常会将OLED的阴极形成为共电极膜层，例如，通常利用大面积的导电膜层来形成OLED的阴极，并且多个OLED单元可以共用该阴极。另外，OLED的阳极通常与驱动电路连接，因此通常将阳极形成为独立的电极。在此情况下，阳极的散热能力往往比阴极的散热能力差，因此在该实施例中，为了改善散热，该OLED显示面板中的第一电极为阳极，使得绝缘导热层能够帮助改善阳极的散热能力。
制备OLED显示面板的过程还可以包括：在第二电极上形成第二基板。第二基板可以是封装基板或者封装薄膜等，本公开不限于此。
下面，将参照图3更具体地描述根据本公开实施例的OLED显示面板中的热传导层的结构。图3是根据本公开一个实施例的OLED显示面板中的一个像素的示意图。
参照图3，OLED显示面板可以包括：扫描线104，沿第一方向延伸；数据线103，沿垂直于所述第一方向的第二方向延伸；OLED单元，包括第一电极、第二电极、以及形成在所述第一电极和所述第二电极之间的有机发光层；以及热传导层105，由绝缘导热材料形成，连接到所述扫描线、所述数据线以及所述OLED单元中的第一电极107。
像素单元主要包括驱动晶体管以及有机发光二极管。其中，驱动晶体管的栅极连接到扫描线104，驱动晶体管的源极连接到数据线103，驱动晶体管的漏极连接到有机发光二极管的第一电极107。利用来自扫描线104的扫描信号，驱动晶体管控制数据线与第一电极107之间的导通和截止，从而将数据信号选择性地传输至第一电极107。应当理解的是，像素单元还可以包括其它的电路结构，例如用于控制OLED发光的发光控制晶体管以及用于储存数据信号的储存电容器等。在本文中将不再对此进行详细描述。
在OLED显示面板的一个像素中，第一电极107可以对应于该 像素的发光区，而第一电极107以外的区域(例如其中形成驱动晶体管等电路结构的区域)可以对应于该像素的非发光区。相应地，OLED显示面板中的对应于所有像素的第一电极的区域为该OLED显示面板的发光区，而发光区域以外的区域对应于该OLED显示面板的非发光区。
参照图3，热传导层105被形成在OLED显示面板的非发光区中。在这种情况下，可以使热传导层105对光的遮挡最小化，从而避免降低OLED显示面板的开口率。
如图3所示，在一个实施例中，热传导层105连接到第一电极107的边缘部分。在这种情况下，可以减少热传导层105对发光区的遮挡，从而确保热传导层105对光的遮挡最小化，从而避免降低OLED显示面板的开口率。
第一电极107可以构成OLED的阳极，以用于接收来自数据线的数据信号。从而控制OLED发出具有相应亮度的光。第一电极107可以由透明导电材料形成，从而使得OLED可以朝向第一电极107的方向发射光。
如前述实施例中所描述的，本公开不限于此，根据需要，OLED也可以朝向第二电极(例如OLED的阴极)的方向发射光，在这种情况下，第二电极可以被形成为透射电极。或者，OLED可以朝向两个方向发射光，在这种情况下，第一电极和第二电极均可以被形成为透射电极。
另外，如图3所示，热传导层105可以形成在与扫描线104、数据线103和第一电极107不同的层中，在这种情况下，热传导层105可以通过过孔106分别连接到扫描线104、数据线103和第一电极107。过孔可以被形成为具有足够大的尺寸，并且可以由绝缘导热材料形成，从而确保热传导层105与扫描线104、数据线103和第一电极107之间的足够的传热率。
在图3中，热传导层105被示出为包括两个单独的矩形区域，然而本实施例不限于此，根据需要，热传导层105可以具有其它的形状，并且热传导层105可以被形成为连续的单个区域。
另外，在本公开的另一个实施例中，热传导层105可以具有不同的构造方式。图4是根据本公开一个实施例的OLED显示面板中的一个像素的示意图。参照图4，根据本公开的当前实施例的OLED显示面板与图3中的OLED显示面板的不同之处在于，所述OLED显示面板还包括第二热传导层105，分别覆盖所述扫描线和所述数据线。在本实施例中，第二热传导层与第一热传导层连续地形成并彼此连接，因此均利用相同的标号105来表示。然而本公开不限于此，第二热传导层也可以与第一热传导层形成在不同的层中并利用过孔彼此连接。
参照图4，第二热传导层分别覆盖栅极线104与数据线103，因此，在这种情况下，进一步增大了热传导层105与金属线(栅极线104与数据线103)之间的接触面积，从而能够更好地利用热传导层和金属线将来自OLED的传导至外部。在一个优选的实施例中，第二热传导层与扫描线104和数据线103具有相同的图案，因此能够利用相同的光刻工艺来同时形成第二热传导层与扫描线104或数据线103，从而提高工艺效率并降低制造成本。
根据本公开的上述实施例，通过第一热传导层105将OLED产生的热从第一电极107传导至栅极线104和数据线103，然后通过栅极线104和数据线105将热量传导至显示面板外部的散热结构。例如，在一个实施例中，如图5所示，显示面板的外部还可以设置有外部散热器108，外部散热器108可以连接到各栅极线104和各数据线103，来自OLED的热量通过栅极线104和数据线103传导至外部散热器108，从而被引导到显示面板的外部。因此，能够改善OLED的散热，从而避免由于OLED发热而导致的发光色度偏移、发光效率降低、产品衰减等问题。
根据本公开，热传导层(包括第一热传导层和第二热传导层)可以由绝缘导热材料形成，例如，在一个实施例中，可以使用BeO薄膜来形成热传导层。BeO薄膜可以具有与Al的导热率接近的导热率，同时具有优良的绝缘性，因此优选地使用BeO薄膜来形成热传导层。
在本公开的一个实施例中，可以使用热解CVD(热解化学气相沉积)法来形成BeO薄膜，使用含Be(铍)的盐作为源物质，在热解CVD设备中使其升温并热解升华，从而在衬底上沉积BeO薄膜。利用该方法，能够沉积出薄膜晶体纯度高，结构性好的BeO薄膜，从而有利于改善OLED的散热。
本公开的另一个实施例提供了一种OLED显示器，该OLED显示屏可以包括：根据本公开任意实施例的OLED显示面板；源驱动器，连接到所述数据线；以及扫描驱动器，连接到所述扫描线。
在本实施例中，该OLED显示面板的具体描述可以参考本公开的前述实施例，因此在这里不再重复。
在本实施例中，源驱动器可以是连接到数据线并向OLED提供数据信号的数据驱动器，扫描驱动器可以是向OLED提供扫描信号的栅极驱动器。本领域技术人员能够在本公开公开的基础上实现该源驱动器和扫描驱动器，因此在本文中将省略对源驱动器和扫描驱动器的详细描述。
图6是根据本公开一个实施例的OLED单元的示意性剖视图。参照图6，改OLED单元包括：底电极610；有机发光层620，形成在所述底电极上；透射电极630，形成在所述有机发光层上620，位于所述OLED单元的发光区中；以及热传导层640，形成在所述OLED单元的非发光区中并连接到所述透射电极630，所述热传导层由绝缘导热材料形成。
OLED单元的发光区对应于有机发光层620所在的区域(换言之，对应于透射电极630所在的区域)，并且非发光区对应于OLED单元的除了发光区以外的区域。
底电极610可以是反射电极，以将有机发光层发出的光朝向透射电极630反射。然而本公开不限于此，根据OLED单元的出光方向，底电极610也可以由透明导电材料形成，从而形成为透射电极。底电极610可以形成在基底600上，基底600可以是包括TFT阵列等电路结构的阵列基板。
在图6中，热传导层640被示出为与透射电极630直接接触， 然而本公开不限于此，热传导层640可以被形成在不同的层中并通过过孔连接到透射电极630。OLED产生的热量经过热传导层640可以被传递至外部。热传导层640的具体描述可以参考在前的实施例，因此在这里将不再赘述。
另外，应当理解的是，本公开中将热传导层形成在显示面板或OLED的非发光区中，然而为了实现热传导层与发光区中的第一电极的连接，热传导层的至少一部分可以延伸到发光区域中，这种情况仍然应当理解为热传导层被形成在非发光区中。
综上所述，根据本公开的OLED显示面板可以包括：扫描线，沿第一方向延伸；数据线，沿垂直于所述第一方向的第二方向延伸；OLED单元，包括第一电极、第二电极、以及形成在所述第一电极和所述第二电极之间的有机发光层；以及热传导层，由绝缘导热材料形成，连接到所述扫描线、所述数据线以及所述OLED单元中的第一电极。根据本公开，能够改善OLED的散热，从而避免由于OLED发热而导致的发光色度偏移、发光效率降低、产品衰减等问题。
可以理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本公开的保护范围。

Claims (17)

  1. 一种OLED显示面板，包括：
    扫描线，沿第一方向延伸；
    数据线，沿垂直于所述第一方向的第二方向延伸；
    OLED单元，包括第一电极、第二电极、以及形成在所述第一电极和所述第二电极之间的有机发光层；以及
    热传导层，由绝缘导热材料形成，连接到所述扫描线、所述数据线以及所述OLED单元中的第一电极。
  2. 根据权利要求1所述的OLED显示面板，其中，所述第一电极为阳极。
  3. 根据权利要求1所述的OLED显示面板，其中，所述热传导层形成在所述OLED显示面板的非发光区中。
  4. 根据权利要求1所述的OLED显示面板，其中，所述第一电极由透明导电材料形成。
  5. 根据权利要求4所述的OLED显示面板，其中，所述热传导层连接到所述第一电极的边缘部分。
  6. 根据权利要求1所述的OLED显示面板，还包括：第二热传导层，分别覆盖所述扫描线和所述数据线。
  7. 根据权利要求6所述的OLED显示面板，其中，所述第二热传导层具有与所述扫描线和所述数据线相同的图案。
  8. 根据权利要求1所述的OLED显示面板，其中，所述热传导层包含BeO薄膜。
  9. 一种OLED显示器，包括：
    根据权利要求1-8中任意一项所述的OLED显示面板。
  10. 一种OLED显示面板的制备方法，包括：
    形成沿第一方向延伸的扫描线以及沿垂直于所述第一方向的第二方向延伸的数据线；
    形成热传导层，所述热传导层连接到所述扫描线和所述数据线；以及
    形成第一电极，所述第一电极连接到所述热传导层，
    其中所述热传导层由绝缘导热材料形成。
  11. 根据权利要求10所述的OLED显示面板的制备方法，其中，所述第一电极为阳极。
  12. 根据权利要求10所述的OLED显示面板的制备方法，其中，所述热传导层形成在所述OLED显示面板的非发光区中。
  13. 根据权利要求10所述的OLED显示面板的制备方法，其中，所述第一电极由透明导电材料形成。
  14. 根据权利要求13所述的OLED显示面板的制备方法，其中，所述热传导层连接到所述第一电极的边缘部分。
  15. 根据权利要求10所述的OLED显示面板的制备方法，还包括：第二热传导层，分别覆盖所述扫描线和所述数据线。
  16. 根据权利要求15所述的OLED显示面板的制备方法，其中，所述第二热传导层具有与所述扫描线和所述数据线相同的图案。
  17. 根据权利要求10所述的OLED显示面板的制备方法，其中，所述热传导层包含BeO薄膜。
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