CN109768074A - Display base plate and its manufacturing method, display panel, display device - Google Patents
Display base plate and its manufacturing method, display panel, display device Download PDFInfo
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Abstract
The present invention provides a kind of display base plate and its manufacturing method, display panel, display device, belongs to field of display technology, can at least partly solve the problems, such as that the service life of existing WOLED type display panel is short, colour gamut is bad.Every layer of organic function layer covers multiple first electrode structures in display base plate of the invention, it include the first kind composite luminescence layer for issuing light of particular color and the second class composite luminescence layer for issuing other color of light in multilayer organic function layer, part first electrode structure is first kind first electrode structure, its sub-pix for being used to form particular color, part first electrode structure is the second class first electrode structure, its sub-pix for being used to form other colors, first kind first electrode structure includes conductive layer and photoluminescent layers, conductive layer is contacted with the organic function layer near substrate, photoluminescent layers can absorb other described color of light and issue the particular color.
Description
Technical field
The invention belongs to field of display technology, and in particular to a kind of display base plate, a kind of manufacturing method of display base plate, one
Kind display panel, a kind of display device.
Background technique
Organic function layer in existing one kind OLED display panel issues white light, cooperates the color film of different colours to shape
At the sub-pix of different colours.Specifically, with the composite luminescence layer of multiple color in organic function layer.Multiple color it is compound
Luminescent layer respectively issues the light of different colours, they mix to form white light.
Since the material of the composite luminescence layer of each color is different, service life and luminous efficiency are also naturally different.If certain face
The service life of the composite luminescence layer of color is shorter, then the service life of display panel is also just shorter.If the composite luminescence layer of certain color
Luminous efficiency it is lower, then the colour gamut of display panel is also smaller.Such as blue composite luminescence layer in prior art
Service life is lower with the service life bob light efficiency of green composite luminescent layer than red.One kind is needed to can be improved the OLED display panel service life
And/or new departure of colour gamut.
Summary of the invention
The present invention at least partly solves the problems, such as that the service life of existing OLED display panel is shorter, colour gamut is low, provides one kind
Display base plate, a kind of manufacturing method of display base plate, a kind of display panel, a kind of display device.
According to a first aspect of the present invention, a kind of display base plate is provided, including substrate, multiple first electricity being arranged in substrate
The multilayer organic function layer that first electrode structure deviates from substrate side is arranged in pole structure, and every layer of organic function layer covering is multiple
First electrode structure includes issuing the first kind composite luminescence layer of light of particular color and issuing other in multilayer organic function layer
Second class composite luminescence layer of color of light, part first electrode structure are first kind first electrode structure, are used to form specific
The sub-pix of color, part first electrode structure are the second class first electrode structure, are used to form the sub-pix of other colors,
First kind first electrode structure includes conductive layer and photoluminescent layers, and conductive layer is contacted with the organic function layer near substrate,
Photoluminescent layers can absorb other described color of light and issue the particular color.
Optionally, the conductive layer in first kind first electrode structure include the first conductive seed layer and can be reflective second lead
Electronic shell, for photoluminescent layers between the first conductive seed layer and the second conductive seed layer, the second conductive seed layer is located at luminescence generated by light
Layer is close to substrate side, and the first conductive seed layer and the second conductive seed layer are electrically connected.
Optionally, the first conductive seed layer and the second conductive seed layer pass through the third conduction minor structure outside photoluminescent layers side
It is connected.
Optionally, photoluminescent layers are quantum dot light electroluminescent layer.
It optionally, further include the second electrode structure that multilayer organic function layer is set and deviates from substrate side.
Optionally, the particular color is blue, and the second class composite luminescence layer includes feux rouges composite luminescence layer and green
Photoreactivation luminescent layer.
Optionally, it is separated between adjacent first electrode structure by pixel defining layer.
According to a second aspect of the present invention, a kind of manufacturing method of display base plate is provided, comprising:
Multiple first electrode structures are formed on the substrate, wherein part first electrode structure is first kind first electrode knot
Structure is used to form the sub-pix of particular color, and part first electrode structure is the second class first electrode structure, is used to form
The sub-pix of other colors, first kind first electrode structure include conductive layer and photoluminescent layers, and photoluminescent layers can absorb
Other color of light simultaneously issue light of particular color, and conductive layer has exposed surface far from substrate side；
Multilayer organic function layer is formed on the exposed surface of conductive layer, wherein every layer of organic function layer covering multiple the
One electrode structure includes issuing the first kind composite luminescence layer of light of particular color and issuing other face in multilayer organic function layer
Second class composite luminescence layer of coloured light, and near the organic function layer contact conductive layer of substrate.
According to a third aspect of the present invention, a kind of display panel, including display base plate and color membrane substrates, the display base plate are provided
For the display base plate of first aspect present invention, the color filter film of multiple and different colors, each colour are provided in color membrane substrates
Filter coating corresponds to a first electrode structure.
According to a fourth aspect of the present invention, a kind of display device is provided, the display panel including third aspect present invention.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of display base plate of the embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of display panel of the embodiment of the present invention；
Fig. 3 is a kind of detailed structure view of display panel of the embodiment of the present invention；
Fig. 4 is a kind of flow diagram of the manufacturing method of display base plate of the embodiment of the present invention；
Wherein, appended drawing reference are as follows: 10, substrate；11, first kind first electrode structure；11 ', second class first electrode structure；
111, conductive layer；111a, the first conductive seed layer；111b, the second conductive seed layer；111c, third conduction minor structure；112, photic hair
Photosphere；121, first kind composite luminescence layer；122, the second class composite luminescence layer；12R, feux rouges composite luminescence layer；12G, green light are multiple
Close luminescent layer；12B, blue light composite luminescence layer；EI, electron injecting layer；ET, electron transfer layer；HI, hole injection layer；HT, hole
Transport layer；13, second electrode structure；14, thin-film encapsulation layer；21, colour film substrate；22R, red filter film；22G, green filter
Film；22B, blue filter film；23, black matrix.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Present invention is further described in detail for formula.
In the present invention, " patterning processes " refer to the step of forming the structure with specific figure, can be photoetching work
Skill, photoetching process include forming material layer, coating photoresist, exposure, development, etching, photoresist lift off and etc. in a step
Or multistep；Certainly, " patterning processes " can also be other techniques such as imprint process, InkJet printing processes.
Embodiment 1:
The present embodiment provides a kind of display base plates, in conjunction with Fig. 1-3 comprising substrate 10, setting on the substrate 10 multiple
The multilayer organic function layer that first electrode structure deviates from 10 side of substrate, every layer of organic function layer is arranged in first electrode structure
Multiple first electrode structures are covered, include the first kind composite luminescence layer 121 for issuing light of particular color in multilayer organic function layer
And the second class composite luminescence layer 122 of other color of light is issued, part first electrode structure is first kind first electrode structure
11, it is used to form the specific sub-pix for changing color, part first electrode structure is second kind electrode structure 11 ', is used for shape
At the sub-pix of other colors, first kind first electrode structure 11 includes conductive layer 111 and photoluminescent layers 112, conductive layer 111
It is contacted with the organic function layer near substrate 10, photoluminescent layers 112 can absorb described in other described color of light and sending
Particular color.
In general, drive circuit layer can be arranged between substrate 10 and first electrode structure to first electrode structure output
Driving voltage.The part can be configured according to the prior art, therefore be not shown in the accompanying drawings.
Multilayer organic function layer participates in forming Organic Light Emitting Diode.Every layer of organic function layer covers multiple first electrode knots
Structure, this structure also WOLED structure.Referring to Fig. 2 it is found that organic luminous layer is full page, opposite first electrode structure and
Region corresponding to two electrode structures 13 forms a sub-pix.Such as shown in figure 3, a organic function layer is successively from top to bottom
For hole injection layer HI, hole transmission layer HT, red composite luminescence layer 12R, green composite luminescent layer 12G, blue recombination luminescence
Layer 12B, electron transfer layer ET, electron injecting layer EI.
Electrons and holes recombination luminescence in first kind composite luminescence layer 121 and the second class composite luminescence layer 122.Multilayer is multiple
The service life and/or luminous efficiency for closing the first kind composite luminescence layer 121 in luminescent layer are lower than the second class composite luminescence layer 122.
Here the light that the composite luminescence layer that the service life is minimum in particular color, that is, each composite luminescence layer or luminous efficiency is minimum is issued
Color.
First electrode structure is, for example, anode construction, and hole is injected into organic function layer.First kind first electrode knot
The effect of conductive layer 111 in structure 11 is to provide driving voltage for organic function layer.Light in first kind first electrode structure 11
The effect of electroluminescent layer 112 is the light for absorbing the second class composite luminescence layer 122 and being issued, and issues the light of particular color.To
It can be the increase of ratio shared by the light of particular color, realize the effect for improving colour gamut.The service life of photoluminescent layers 112 is usually
It is longer than the service life of first kind composite luminescence layer 121, even if 121 partial failure of first kind composite luminescence layer, can also be used photic
Luminescent layer 112 supplements the light of particular color, so can also be improved the service life of display panel.
It should be noted that the light that each composite luminescence layer issues is that do not have the light directive, photoluminescent layers 112 issue
And do not have directive.In order to realize first kind first electrode structure 11 electrode function, conductive layer 111 need near
One layer of organic function layer contact of nearly substrate 10.In order to which the luminous energy for allowing the second class composite luminescence layer 122 to issue is mapped to luminescence generated by light
Layer 112, a kind of mode are that photoluminescent layers 112 and conductive layer 111 are arranged side by side, but can reduce in this way conductive layer 111 with it is organic
The contact area of functional layer；Another way is that the partial region of conductive layer 111 is arranged in photoluminescent layers 112 and organic functions
Between layer, this partial electroconductive layer 111 is transparency conducting layer 111 (such as ITO) or Mo.
The display panel that the display base plate participates in constituting can be emission structure at top and (refer to for the light of display from substrate 10
It is projected to the direction of first electrode structure).In this case referring to Fig. 3, conductive layer 111 includes the first conductive seed layer 111a and energy
Enough the second reflective conductive seed layer 111b, photoluminescent layers 112 are located at the first conductive seed layer 111a and the second conductive seed layer 111b
Between, the second conductive seed layer 111b is located at photoluminescent layers 112 close to 10 side of substrate, and the first conductive seed layer 111a and second
Conductive seed layer 111b electrical connection.To enable light to be injected into photoluminescent layers 112, the first conductive seed layer 111a is preferably saturating
Bright structure.To enable light to project towards the direction for being directed toward first electrode structure from substrate 10, the second conductive seed layer 111b is reflective
Structure (e.g. Ag Al material is formed).
Optionally, as shown in figure 3, the first conductive seed layer 111a and the second conductive seed layer 111b passes through photoluminescent layers 112
Third conduction minor structure 111c outside side is connected.Certainly, the first conductive seed layer 111a and the second conductive seed layer 111b can also be with
By passing through electrical connection through photoluminescent layers 112.
Specifically, in Fig. 3, first the first conductive seed layer 111a is preferably transparent oxide semiconductor material from top to bottom
(e.g. ITO), it is therefore an objective to which realization is matched with the work function of hole injection layer HI.The work of the third conduction minor structure 111c of two sides
With being to realize the electrical connection between conductive seed layer up and down.The material of third conduction minor structure 111c can be with the first conductive seed layer
111a material is identical, can also be identical as the material of the second conductive seed layer 111b.First conductive son of 112 lower section of photoluminescent layers
The effect of layer 111a is also to realize work function matching, and preferred material is transparent oxide semiconductor.Second conductive seed layer 111b
Effect be to realize the reflection of light, i.e., the light issued first kind composite luminescence layer 121 and the second class composite luminescence layer 122 is upward
It reflects away for showing, the light that photoluminescent layers 112 issue can also be reflected away certainly upwards and be used to show.
It should be noted that the display panel that the display base plate participates in constituting is also possible to bottom emitting structure.Such as by Fig. 2
In color membrane substrates be arranged below substrate 10 the case where.Corresponding second electrode structure 13 at this time should be reflectorized material structure
At.
It should be noted that for the second class first electrode structure 11 ', whether it is transparent electrode or whether is reflective
Electrode and its whether be single layer structure or multilayered structure, can be configured according to the prior art, the application does not do this
Particular determination.
Optionally, photoluminescent layers 112 are quantum dot light electroluminescent layer 112.Quantum dot light electroluminescent layer 112 is by quantum dot
It is dispersed in matrix and is formed, it is available to have matured product on the market, and luminous efficiency is higher.
It optionally, further include the second electrode structure 13 that multilayer organic function layer is set and deviates from 10 side of substrate.Join
According to Fig. 2 and Fig. 3, second electrode structure 13 is usually the cathode construction of full page.Certain second electrode structure 13 can also be divided into more
Block.Particularly, in structure shown in Fig. 3, if second electrode structure 13 is formed by Mg:Al alloy, when the thickness foot of alloy
When enough thin, second electrode structure 13 is semi-transparent semi-reflecting structure, and the light that more second class composite luminescence layers 122 can be issued is anti-
Directive photoluminescent layers 112.
Optionally, the particular color be blue, the second class composite luminescence layer 122 include feux rouges composite luminescence layer and
Green light composite luminescence layer.I.e. photoluminescent layers 112 can absorb feux rouges and green light and can issue blue light.To compound to blue
Luminescent layer 12B carries out reinforcement.In this example, first kind first electrode structure 11 is used to form blue subpixels, the second class
First electrode structure 11 ' is used to form red sub-pixel or green sub-pixels.
Optionally, it is separated between adjacent first electrode structure by pixel defining layer.
Each thin-film encapsulation layer shown in the accompanying drawings 14 and the colour film substrate 21 of composition color membrane substrates, red filter film
22R, green filter film 22G, blue filter film 22B, black matrix 23 can be configured according to the prior art, therefore not do herein
It repeats.
Embodiment 2:
The present embodiment provides a kind of manufacturing methods of display base plate, referring to Fig. 4, comprising:
Multiple first electrode structures are formed on the substrate 10, wherein part first electrode structure is first kind first electrode
Structure 11 is used to form the sub-pix of particular color, and part first electrode structure is the second class first electrode structure 11 ',
It is used to form the sub-pix of other colors, first kind first electrode structure 11 includes conductive layer 111 and photoluminescent layers 112, light
Electroluminescent layer 112 can absorb other color of light and issue light of particular color, and conductive layer 111 has naked in separate 10 side of substrate
Reveal surface；
Multilayer organic function layer is formed on the exposed surface of conductive layer 111, wherein every layer of organic function layer covering is multiple
First electrode structure includes issuing the first kind composite luminescence layer 121 of light of particular color and issuing in multilayer organic function layer
Second class composite luminescence layer 122 of other color of light, and near the organic function layer contact conductive layer 111 of substrate 10.
First electrode structure (including first kind first electrode structure is successively made according to structure provided by embodiment 1
11 and the second class first electrode structure 11 ') and organic function layer.
For display base plate in the display panel shown in Fig. 3, the step of making first electrode structure, which may is that, successively sinks
Product is used to form the conductive material of the first conductive seed layer 111a, the second conductive seed layer 111b, the first conductive seed layer 111a, then benefit
The pattern of photoluminescent layers 112 is formed with patterning processes.Deposition is used to form third conduction minor structure 111c, the first conduction later
The material of sublayer 111a.The conductor material in the region of pixel defining layer 15 is used to form followed by patterning processes removal, thus
Form first kind first electrode structure 11 and the second class first electrode structure 11 '.Pixel circle is formed followed by patterning processes
The pattern of given layer 15.
Embodiment 3:
The present embodiment provides a kind of display panels, referring to Fig. 2 and Fig. 3, including display base plate and color membrane substrates, the display base
Plate is the display base plate of the embodiment of the present invention 1, and the color filter film of multiple and different colors, each colour are provided in color membrane substrates
Filter coating corresponds to a first electrode structure.Specifically, the structure of display panel understands in combination with the description of embodiment 1.This is aobvious
Show that its colour gamut and/or service life are improved panel compared to the prior art.
Embodiment 4:
The present embodiment provides a kind of display device, the display panel including the embodiment of the present invention 3.
Specifically, the display device can be Organic Light Emitting Diode (OLED) display module, mobile phone, tablet computer, TV
Any products or components having a display function such as machine, display, laptop, Digital Frame, navigator.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of display base plate including substrate, the multiple first electrode structures being arranged in substrate, is arranged in first electrode structure
Multilayer organic function layer away from substrate side, every layer of organic function layer cover multiple first electrode structures, multilayer organic functions
Including issuing the first kind composite luminescence layer of light of particular color and issuing the second class composite luminescence layer of other color of light in layer,
Part first electrode structure is first kind first electrode structure, is used to form the sub-pix of particular color, part first electrode
Structure is the second class first electrode structure, is used to form the sub-pix of other colors, which is characterized in that first kind first electrode
Structure includes conductive layer and photoluminescent layers, and conductive layer is contacted with the organic function layer near substrate, and photoluminescent layers can
It absorbs other described color of light and issues the particular color.
2. display base plate according to claim 1, which is characterized in that the conductive layer in first kind first electrode structure includes
First conductive seed layer and the second conductive seed layer that can be reflective, photoluminescent layers are located at the first conductive seed layer and the second conductive seed layer
Between, the second conductive seed layer is located at photoluminescent layers close to substrate side, and the first conductive seed layer and the second conductive seed layer are electrically connected
It connects.
3. display base plate according to claim 2, which is characterized in that the first conductive seed layer and the second conductive seed layer pass through light
Third conduction minor structure outside electroluminescent layer side is connected.
4. display base plate according to claim 1, which is characterized in that photoluminescent layers are quantum dot light electroluminescent layer.
5. display base plate according to claim 1, which is characterized in that further include being arranged in multilayer organic function layer away from base
The second electrode structure of bottom side.
6. display base plate according to claim 1, which is characterized in that the particular color is blue, the compound hair of the second class
Photosphere includes feux rouges composite luminescence layer and green light composite luminescence layer.
7. display base plate according to claim 1, which is characterized in that pass through pixel circle between adjacent first electrode structure
Given layer separates.
8. a kind of manufacturing method of display base plate characterized by comprising
Multiple first electrode structures are formed on the substrate, wherein part first electrode structure is first kind first electrode structure,
It is used to form the sub-pix of particular color, part first electrode structure is the second class first electrode structure, is used to form other
The sub-pix of color, first kind first electrode structure include conductive layer and photoluminescent layers, and photoluminescent layers can absorb other
Color of light simultaneously issues light of particular color, and conductive layer has exposed surface far from substrate side；
Multilayer organic function layer is formed on the exposed surface of conductive layer, wherein multiple first electricity of every layer of organic function layer covering
Pole structure includes issuing the first kind composite luminescence layer of light of particular color and issuing other color of light in multilayer organic function layer
The second class composite luminescence layer, and near the organic function layer contact conductive layer of substrate.
9. a kind of display panel, including display base plate and color membrane substrates, which is characterized in that the display base plate is according to claim
Display base plate described in 1-7 any one is provided with the color filter film of multiple and different colors, each colored filter in color membrane substrates
Light film corresponds to a first electrode structure.
10. a kind of display device, which is characterized in that including display panel according to claim 9.
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