US20180130860A1 - Method for fabricating coa array substrate, array substrate and display device - Google Patents

Method for fabricating coa array substrate, array substrate and display device Download PDF

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US20180130860A1
US20180130860A1 US15/861,002 US201815861002A US2018130860A1 US 20180130860 A1 US20180130860 A1 US 20180130860A1 US 201815861002 A US201815861002 A US 201815861002A US 2018130860 A1 US2018130860 A1 US 2018130860A1
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array substrate
layer
color filter
photoresist layer
coa
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Yonglian QI
Shi SHU
Guanbao HUI
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • H01L27/3248—
    • 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
    • H10K59/123—Connection of the pixel electrodes to the thin film transistors [TFT]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
    • H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
    • H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
    • H01L23/535—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including internal interconnections, e.g. cross-under constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1259—Multistep manufacturing methods
    • H01L27/322—
    • H01L51/56—
    • 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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136222—Colour filters incorporated in the active matrix substrate
    • G02F2001/136222—
    • H01L2227/323—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • 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

Definitions

  • Embodiments of the invention relate to the field of liquid crystal display technologies, more particularly, to a method for fabricating a color filter on array (COA) array substrate, an array substrate and a display device.
  • COA color filter on array
  • COA array substrate refers to a TFT substrate 11 above which a color filter layer 13 is fabricated, wherein the TFT substrate 11 comprises a substrate 111 and a Thin Film Transistor (TFT) 112 .
  • TFT Thin Film Transistor
  • FIG. 1 illustrates a configuration of a conventional COA array substrate and FIG. 2 illustrates an exposing procedure for forming a via hole 15 .
  • methods for fabricating the color filter layer on the TFT substrate mainly involve patterning process or ink-jet printing process.
  • a separately fabricated barricade structure is required for the conventional ink-jet printing process, which is then removed after finishing fabricating the color filter layer 13 (the color filter layer is formed by coating a protection layer 12 on the TFT substrate and then performing a patterning process). Thereafter a planarized layer 14 is formed, thereby forming the COA array substrate structure.
  • a separate patterning process is required to form the via hole 15 . Therefore, the process is complicated and the production efficiency is low while the cost is high.
  • Embodiments of the invention provide a method for fabricating an array substrate, an array substrate and a display device which can reduce the fabrication processes and the cost while improving the production efficiency.
  • a first aspect of the invention provides a method for fabricating a COA array substrate, the COA array substrate comprises a TFT substrate and a color filter layer disposed on the TFT substrate, the method comprises the following steps: forming a protection layer on the TFT substrate; coating a photoresist layer on the protection layer, the photoresist layer functions as a planarized layer, wherein the TFT substrate comprises a substrate and a TFT; forming a color filter receiving hole in the photoresist layer through a photolithography process; fabricating the color filter layer in the color filter receiving hole.
  • the photoresist layer in the invention has a good fluidity, therefore the step different is very small.
  • the photoresist layer may function as the planarized layer at the same time.
  • a pattern comprising the color filter receiving hole is formed by exposing and developing the photoresist layer through a patterning process.
  • the planarized layer is no longer formed separately, making the manufacturing step simple while saving production cost.
  • a second aspect of the invention provides a COA array substrate, comprising a photoresist layer 21 disposed on a protection layer 12 , the photoresist layer 21 functions a planarized layer, a color filter receiving hole 32 is formed in the photoresist layer, and a color filter layer 13 is formed in the color filter receiving hole 32 .
  • the photoresist layer of the array substrate according to the invention not only has the color filter receiving hole formed therein but also functions as the planarized layer, the cost of the array substrate is low.
  • a third aspect of the invention provides a display device comprising the above COA array substrate.
  • the display device is of low cost and simple manufacturing steps as it is provided with the above array substrate.
  • FIG. 1 schematically illustrates a configuration of a conventional COA array substrate
  • FIG. 2 schematically illustrates a diagram of exposing a photoresist layer of a COA array substrate in a method for fabricating an array substrate in accordance with Embodiment 1 of the invention
  • FIG. 3 schematically illustrates a diagram after exposing the photoresist layer of the COA array substrate in the method for fabricating the COA array substrate in accordance with Embodiment 1 of the invention
  • FIG. 4 schematically illustrates a diagram of fabricating a color filter layer of the COA array substrate in the method for fabricating the COA array substrate in accordance with Embodiment 1 of the invention
  • FIG. 5 schematically illustrates a diagram of fabricating a via hole above the COA array substrate in the method for fabricating the COA array substrate in accordance with Embodiment 1 of the invention.
  • FIG. 6 schematically illustrates a diagram of fabricating a pixel electrode or an anode in the via hole of the COA array substrate in the method for fabricating the COA array substrate in accordance with embodiments of the invention.
  • the embodiment of the invention provides a method for fabricating a COA array substrate, comprising:
  • Step 1 first forming components such as a TFT 112 and metal wires on a substrate 111 to finish fabricating a TFT substrate 11 ; forming a protection layer 12 on the TFT substrate 11 , wherein the protection layer 12 is configured for protecting the substrate.
  • Step 2 coating a photoresist layer 21 on the protection layer 12 , exposing the photoresist layer 21 with a mask 22 through a patterning process, the exposed region is a color pixel region; developing the color pixel region after exposing; then baking to form a color filter receiving hole 32 ; the photoresist layer 21 also functions as a planarized layer 14 .
  • Step 3 adding dyestuff into the color filter receiving hole 32 to form a color filter layer 13 .
  • the photoresist layer 21 may also function as the planarized layer 14 . Therefore there is no need to fabricate the planarized layer 14 , making the fabrication process simple, production efficiency high and cost low.
  • forming the color filter layer in the color filter receiving hole 32 comprises: forming the color filter layer 13 in the color filter receiving hole 32 by ink-jet printing process.
  • the photoresist layer 21 is exposed and developed during the patterning process to form the color filter receiving hole 32 .
  • the photoresist will still exist in other regions after the developing (in the case of using a negative photoresist, the region having the color filter receiving hole 32 is not irradiated while other regions are irradiated, therefore the photoresist still exist in other regions after the developing).
  • the remaining photoresist layer 21 actually forms a barricade.
  • the COA array substrate is an OLED array substrate
  • step 2 comprises:
  • the method further comprises: forming an OLED anode on the color filter layer 13 , the OLED anode 16 is electrically connected to the drain electrode of the TFT 112 through the via hole 15 , as illustrated in FIG. 6 .
  • the OLED anode may also be formed on the TFT substrate 11 , the OLED anode may be directly connected to the drain electrode of the TFT 112 ; in this case there is no need to form the via hole 15 through the patterning process.
  • the COA array substrate is a TFT-LCD array substrate, and step 2 comprises:
  • the first via hole 31 penetrates through the planarized layer 14 ;
  • the method further comprises: forming a pixel electrode 17 on the color filter layer 13 , the pixel electrode is connected to a drain electrode of the TFT 112 through the via hole 15 , as illustrated in FIG. 6 .
  • the pixel electrode may also be formed on the TFT substrate 11 , the pixel electrode may be directly connected to the drain electrode of the TFT 112 ; in this case there is no need to form the via hole 15 through the patterning process.
  • the embodiment provides an array substrate, comprising a photoresist layer 21 disposed on a protection layer 12 , wherein the photoresist layer 21 functions as a planarized layer 14 , a color filter receiving hole 32 is formed in the photoresist layer 21 , a color filter layer 13 is formed in the color filter receiving hole 32 .
  • the photoresist layer 21 functions as the planarized layer 14 , the cost can be saved during fabrication.
  • the array substrate is an OLED array substrate, a via hole 15 penetrating through the photoresist layer 14 and the protection layer 12 is disposed on the COA array substrate, an OLED anode is electrically connected to a drain electrode of a TFT 112 on the OLED substrate through the via hole 15 .
  • the OLED may also be formed on the TFT substrate 11 , the OLED anode is directly connected to the drain electrode of the TFT 112 ; in this case there is no need to form the via hole 15 .
  • the array substrate is a TFT-LCD array substrate, a via hole 15 penetrating through the photoresist layer 14 and the protection layer 12 is disposed on the COA array substrate, a pixel electrode is electrically connected to a drain electrode of a TFT 112 on the TFT-LCD array substrate through the via hole 15 .
  • the pixel electrode may also be formed on the TFT substrate 11 , the pixel electrode may be directly connected to the drain electrode of the TFT 112 ; in this case there is no need to form the via hole 15 .
  • the COA array substrate of the embodiment may be fabricated by using the fabrication method of Embodiment 1 without the need for the planarized layer 14 and the barricade. Detailed description will not be provided.
  • the array substrate thus has high production efficiency and a low cost.
  • the embodiment provides a display device comprising the above array substrate. It may also comprise conventional structures of the display device such as a frame.
  • An example of the display device is a liquid crystal display (LCD) device, wherein an array substrate and an opposed substrate are disposed opposed to each other to form a liquid crystal cell, a liquid crystal material is filled in the liquid crystal cell.
  • the opposed substrate is for example a color filter substrate.
  • a pixel electrode of each pixel unit of the array substrate is adapted to applying an electric field to control the rotation of the liquid crystal material, thereby displaying images.
  • the LCD device further comprises a backlight module for providing backlight to the array substrate.
  • OLED organic electroluminescent display
  • the fabrication process is simple and the cost is low.

Abstract

A method for fabricating a COA array substrate, an array substrate and a display device are provided. The COA array substrate includes a photoresist layer disposed on a protection layer, wherein a color filter receiving hole is formed in the photoresist layer, and a color filter layer is formed in the color filter receiving hole, an entire surface of the photoresist layer is flushed with an entire surface of the color filter layer such that the photoresist layer functions as the planarized layer.

Description

  • This application is a divisional of U.S. application Ser. No. 14/351,639 filed on Apr. 14, 2014 and Applicant claims priority under 35 U.S.C. § 120 of U.S. application Ser. No. 14/351,639, which application is a national stage application under 35 U.S.C. § 371 of PCT Application No. PCT/CN2013/077492 filed Jun. 19, 2013 which claims priority under 35 U.S.C. § 119 from Chinese Patent Application No. 201310108090.1 filed Mar. 29, 2013, the disclosures of each of which are hereby incorporated by reference. A certified copy of priority Chinese Patent Application No. 201310108090.1 is contained in parent U.S. application Ser. No. 14/351,639. The International Application under PCT article 21(2) was not published in English.
    • FIELD OF THE ART
  • Embodiments of the invention relate to the field of liquid crystal display technologies, more particularly, to a method for fabricating a color filter on array (COA) array substrate, an array substrate and a display device.
    • BACKGROUND
  • COA array substrate refers to a TFT substrate 11 above which a color filter layer 13 is fabricated, wherein the TFT substrate 11 comprises a substrate 111 and a Thin Film Transistor (TFT) 112. With such a design, it can reduce the width of the black matrix while improving the aperture ratio of the display region. FIG. 1 illustrates a configuration of a conventional COA array substrate and FIG. 2 illustrates an exposing procedure for forming a via hole 15.
  • Currently, methods for fabricating the color filter layer on the TFT substrate mainly involve patterning process or ink-jet printing process. A separately fabricated barricade structure is required for the conventional ink-jet printing process, which is then removed after finishing fabricating the color filter layer 13 (the color filter layer is formed by coating a protection layer 12 on the TFT substrate and then performing a patterning process). Thereafter a planarized layer 14 is formed, thereby forming the COA array substrate structure. Meanwhile, a separate patterning process is required to form the via hole 15. Therefore, the process is complicated and the production efficiency is low while the cost is high.
    • SUMMARY
  • Embodiments of the invention provide a method for fabricating an array substrate, an array substrate and a display device which can reduce the fabrication processes and the cost while improving the production efficiency.
  • A first aspect of the invention provides a method for fabricating a COA array substrate, the COA array substrate comprises a TFT substrate and a color filter layer disposed on the TFT substrate, the method comprises the following steps: forming a protection layer on the TFT substrate; coating a photoresist layer on the protection layer, the photoresist layer functions as a planarized layer, wherein the TFT substrate comprises a substrate and a TFT; forming a color filter receiving hole in the photoresist layer through a photolithography process; fabricating the color filter layer in the color filter receiving hole.
  • The photoresist layer in the invention has a good fluidity, therefore the step different is very small. As a result, the photoresist layer may function as the planarized layer at the same time. A pattern comprising the color filter receiving hole is formed by exposing and developing the photoresist layer through a patterning process. In comparison with conventional method for fabricating an array substrate, the planarized layer is no longer formed separately, making the manufacturing step simple while saving production cost.
  • A second aspect of the invention provides a COA array substrate, comprising a photoresist layer 21 disposed on a protection layer 12, the photoresist layer 21 functions a planarized layer, a color filter receiving hole 32 is formed in the photoresist layer, and a color filter layer 13 is formed in the color filter receiving hole 32.
  • As the photoresist layer of the array substrate according to the invention not only has the color filter receiving hole formed therein but also functions as the planarized layer, the cost of the array substrate is low.
  • A third aspect of the invention provides a display device comprising the above COA array substrate.
  • The display device is of low cost and simple manufacturing steps as it is provided with the above array substrate.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • In order to clearly illustrate the technical solution of the embodiments of the invention, the drawings of the embodiments will be briefly described in the following; it is obvious that the described drawings are only related to some embodiments of the invention and thus are not limitative of the invention.
  • FIG. 1 schematically illustrates a configuration of a conventional COA array substrate;
  • FIG. 2 schematically illustrates a diagram of exposing a photoresist layer of a COA array substrate in a method for fabricating an array substrate in accordance with Embodiment 1 of the invention;
  • FIG. 3 schematically illustrates a diagram after exposing the photoresist layer of the COA array substrate in the method for fabricating the COA array substrate in accordance with Embodiment 1 of the invention;
  • FIG. 4 schematically illustrates a diagram of fabricating a color filter layer of the COA array substrate in the method for fabricating the COA array substrate in accordance with Embodiment 1 of the invention;
  • FIG. 5 schematically illustrates a diagram of fabricating a via hole above the COA array substrate in the method for fabricating the COA array substrate in accordance with Embodiment 1 of the invention; and
  • FIG. 6 schematically illustrates a diagram of fabricating a pixel electrode or an anode in the via hole of the COA array substrate in the method for fabricating the COA array substrate in accordance with embodiments of the invention.
    •  DETAILED DESCRIPTION
  • In order to make objects, technical details and advantages of the embodiments of the invention apparent, the technical solutions of the embodiment will be described in a clearly and fully understandable way in connection with the drawings related to the embodiments of the invention. It is obvious that the described embodiments are just a part but not all of the embodiments of the invention. Based on the described embodiments herein, those skilled in the art can obtain other embodiment(s), without any inventive work, which should be within the scope of the invention.
    • Embodiment 1
  • With reference to FIGS. 3 to 6, the embodiment of the invention provides a method for fabricating a COA array substrate, comprising:
  • Step 1: first forming components such as a TFT 112 and metal wires on a substrate 111 to finish fabricating a TFT substrate 11; forming a protection layer 12 on the TFT substrate 11, wherein the protection layer 12 is configured for protecting the substrate.
  • Step 2: coating a photoresist layer 21 on the protection layer 12, exposing the photoresist layer 21 with a mask 22 through a patterning process, the exposed region is a color pixel region; developing the color pixel region after exposing; then baking to form a color filter receiving hole 32; the photoresist layer 21 also functions as a planarized layer 14.
  • Step 3: adding dyestuff into the color filter receiving hole 32 to form a color filter layer 13. Herein, as the step difference of the photoresist layer 21 is very small, the photoresist layer 21 may also function as the planarized layer 14. Therefore there is no need to fabricate the planarized layer 14, making the fabrication process simple, production efficiency high and cost low.
  • Preferably, forming the color filter layer in the color filter receiving hole 32 comprises: forming the color filter layer 13 in the color filter receiving hole 32 by ink-jet printing process. In the method provided by the embodiment, the photoresist layer 21 is exposed and developed during the patterning process to form the color filter receiving hole 32. As a positive photoresist is used to fabricate the color filter receiving hole 32, the photoresist will still exist in other regions after the developing (in the case of using a negative photoresist, the region having the color filter receiving hole 32 is not irradiated while other regions are irradiated, therefore the photoresist still exist in other regions after the developing). The remaining photoresist layer 21 actually forms a barricade. In this case, there is no need for separately forming the barricade when using ink-jet printing process to form the color filter layer 13. In comparison with conventional fabrication method, the step of forming the barricade is omitted, which can significantly improve the production efficiency and reduce the production cost.
  • Preferably, the COA array substrate is an OLED array substrate, and step 2 comprises:
  • with reference to FIG. 3, forming the color filter receiving hole 32 and a first via hole 31 through a single patterning process, wherein the first via hole 31 penetrates through the planarized layer 14;
  • with reference to FIG. 5, etching the protection layer 12 in the first via hole 31 region to form a via hole 15 exposing a drain electrode of the TFT 112.
  • After forming the color filter layer 13 at step 3, the method further comprises: forming an OLED anode on the color filter layer 13, the OLED anode 16 is electrically connected to the drain electrode of the TFT 112 through the via hole 15, as illustrated in FIG. 6.
  • The OLED anode may also be formed on the TFT substrate 11, the OLED anode may be directly connected to the drain electrode of the TFT 112; in this case there is no need to form the via hole 15 through the patterning process.
  • Preferably, the COA array substrate is a TFT-LCD array substrate, and step 2 comprises:
  • with reference to FIG. 3, forming the color filter receiving hole 32 and a first via hole 31 through a single patterning process, the first via hole 31 penetrates through the planarized layer 14;
  • with reference to FIG. 5, etching the protection layer 12 in the first via hole 31 region to form a via hole 15 exposing a drain electrode of the TFT 112;
  • After forming the color filter layer 13 at step 3, the method further comprises: forming a pixel electrode 17 on the color filter layer 13, the pixel electrode is connected to a drain electrode of the TFT 112 through the via hole 15, as illustrated in FIG. 6.
  • The pixel electrode may also be formed on the TFT substrate 11, the pixel electrode may be directly connected to the drain electrode of the TFT 112; in this case there is no need to form the via hole 15 through the patterning process.
    • Embodiment 2
  • The embodiment provides an array substrate, comprising a photoresist layer 21 disposed on a protection layer 12, wherein the photoresist layer 21 functions as a planarized layer 14, a color filter receiving hole 32 is formed in the photoresist layer 21, a color filter layer 13 is formed in the color filter receiving hole 32. As the photoresist layer 21 functions as the planarized layer 14, the cost can be saved during fabrication.
  • Preferably, the array substrate is an OLED array substrate, a via hole 15 penetrating through the photoresist layer 14 and the protection layer 12 is disposed on the COA array substrate, an OLED anode is electrically connected to a drain electrode of a TFT 112 on the OLED substrate through the via hole 15. It can be contemplated that the OLED may also be formed on the TFT substrate 11, the OLED anode is directly connected to the drain electrode of the TFT 112; in this case there is no need to form the via hole 15.
  • Preferably, the array substrate is a TFT-LCD array substrate, a via hole 15 penetrating through the photoresist layer 14 and the protection layer 12 is disposed on the COA array substrate, a pixel electrode is electrically connected to a drain electrode of a TFT 112 on the TFT-LCD array substrate through the via hole 15. It can be contemplated that the pixel electrode may also be formed on the TFT substrate 11, the pixel electrode may be directly connected to the drain electrode of the TFT 112; in this case there is no need to form the via hole 15.
  • The COA array substrate of the embodiment may be fabricated by using the fabrication method of Embodiment 1 without the need for the planarized layer 14 and the barricade. Detailed description will not be provided. The array substrate thus has high production efficiency and a low cost.
    • Embodiment 3
  • The embodiment provides a display device comprising the above array substrate. It may also comprise conventional structures of the display device such as a frame.
  • An example of the display device is a liquid crystal display (LCD) device, wherein an array substrate and an opposed substrate are disposed opposed to each other to form a liquid crystal cell, a liquid crystal material is filled in the liquid crystal cell. The opposed substrate is for example a color filter substrate. A pixel electrode of each pixel unit of the array substrate is adapted to applying an electric field to control the rotation of the liquid crystal material, thereby displaying images. In some examples, the LCD device further comprises a backlight module for providing backlight to the array substrate.
  • Another example of the display device is an organic electroluminescent display (OLED) device, wherein an organic light emitting layer is formed on the array substrate, a pixel electrode of the pixel unit functions an anode or a cathode for driving the organic light emitting layer to display images.
  • As the display device comprises the array substrate, the fabrication process is simple and the cost is low.
  • What are described above is related to the illustrative embodiments of the disclosure only and not limitative to the scope of the disclosure; the scopes of the disclosure are defined by the accompanying claims.

Claims (4)

What is claimed is:
1. A COA array substrate, comprising a photoresist layer disposed on a protection layer, wherein a color filter receiving hole is formed in the photoresist layer, and a color filter layer is formed in the color filter receiving hole, an entire surface of the photoresist layer is flushed with an entire surface of the color filter layer such that the photoresist layer functions as the planarized layer.
2. The COA array substrate of claim 1, wherein the COA array substrate is an OLED array substrate, a via hole penetrating through the photoresist layer and the protection layer is disposed on the COA array substrate, an OLED anode is electrically connected to a drain electrode of a TFT on the OLED substrate through the via hole.
3. The COA array substrate of claim 1, wherein the COA array substrate is a TFT-LCD array substrate, a via hole penetrating through the photoresist layer and the protection layer is disposed on the COA array substrate, a pixel electrode is electrically connected to a drain electrode of a TFT on the TFT-LCD substrate through the via hole.
4. A display device comprising the COA array substrate of claim 1.
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KR102418492B1 (en) * 2015-06-30 2022-07-06 엘지디스플레이 주식회사 Flexible organic light emitting display panel
CN105097883A (en) * 2015-08-03 2015-11-25 京东方科技集团股份有限公司 Display panel, preparation method thereof and display device
CN105679763A (en) * 2016-01-05 2016-06-15 深圳市华星光电技术有限公司 Array substrate and manufacturing method thereof and display panel
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CN106783883B (en) * 2016-12-27 2023-11-10 京东方科技集团股份有限公司 Display substrate and preparation method thereof
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