CN109728065A - Display base plate and preparation method thereof, display device - Google Patents
Display base plate and preparation method thereof, display device Download PDFInfo
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- CN109728065A CN109728065A CN201910019195.7A CN201910019195A CN109728065A CN 109728065 A CN109728065 A CN 109728065A CN 201910019195 A CN201910019195 A CN 201910019195A CN 109728065 A CN109728065 A CN 109728065A
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Abstract
The present invention provides a kind of display base plate and preparation method thereof, display device, belongs to field of display technology.Kind display base plate of the invention, comprising: substrate；Multiple luminescent devices are located in the substrate；Wherein, each luminescent device includes: first electrode, luminescent layer and second electrode in the multiple luminescent device；The second electrode of at least one luminescent device in auxiliary electrode layer, with the multiple luminescent device is connected in parallel.
Description
Technical field
The invention belongs to field of display technology, and in particular to a kind of display base plate and preparation method thereof, display device.
Background technique
It is aobvious that Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) is also known as organic electric laser
Show, organic luminous semiconductor.Deng Qingyun (Ching W.Tang) is taught by Chinese descendant in America to find in the lab in 1979.
OLED display technology have many advantages, such as self-luminous, wide viewing angle, almost infinite high contrast, compared with low power consumption, high reaction speed.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art, a kind of display base plate and its system are provided
Preparation Method, display device.
Solving technical solution used by present invention problem is a kind of display base plate, comprising:
Substrate；
Multiple luminescent devices are located in the substrate；Wherein, each luminescent device wraps in the multiple luminescent device
It includes: first electrode, luminescent layer and second electrode；
The second electrode of at least one luminescent device in auxiliary electrode layer, with the multiple luminescent device is connected in parallel.
Preferably, the first electrode interval setting of each luminescent device in the multiple luminescent device；The multiple hair
The second electrode of each luminescent device in optical device forms integral structure, and the auxiliary electrode layer is in parallel with the second electrode to be connected
It connects.
Preferably, the display base plate is divided into transparent area and shading region；The display base plate further include: be arranged in institute
State the encapsulated layer between the second electrode of multiple luminescent devices and the auxiliary electrode layer；Wherein,
Multiple connection via holes are provided in the encapsulated layer, the multiple connection via hole is located at the shading region；It is described
Auxiliary electrode layer is connect by connecting via hole with the second electrode.
Preferably, in the plane being parallel to where the substrate, each of the multiple connection via hole and therewith
The shortest distance between adjacent transparent area is more than or equal to 0.5 μm.
Preferably, the display base plate further include: pixel confining layer, the pixel confining layer include multiple openings, institute
State the first electrode for each luminescent device that each of multiple openings expose in the multiple luminescent device；Wherein,
It is most short between opening in each of the multiple connection via hole and the pixel confining layer adjacent thereto
Distance is more than or equal to 0.5 μm.
Preferably, the display base plate is divided into transparent area and shading region；The display base plate further includes multiple optical filterings
Piece and black matrix；Wherein,
Each optical filter in the multiple optical filter is arranged in a one-to-one correspondence with the transparent area；
The black matrix is arranged in a one-to-one correspondence with the shading region.
Preferably, the display device includes white light organic electroluminescent device.
Preferably, the material of the auxiliary electrode includes transparent conductive material.
Solve the preparation method that technical solution used by present invention problem is a kind of display base plate, comprising:
Multiple luminescent devices are formed on the substrate；Wherein, the step of each luminescent device in the multiple luminescent device is formed
It suddenly include: to form first electrode, luminescent layer and second electrode；
Auxiliary electrode layer is formed, at least one luminescent device in the auxiliary electrode layer and the multiple luminescent device
Second electrode is in parallel.
Preferably, the display base plate is divided into shading region and transparent area；Forming the of the multiple luminescent device
Between the step of two electrodes and the formation auxiliary electrode layer, further includes:
Encapsulated layer is formed, and is formed with multiple connection via holes in the encapsulated layer, the multiple connection via hole is located at institute
State shading region；The auxiliary electrode layer is connect by connecting via hole with the second electrode.
Preferably, the display base plate is divided into shading region and transparent area；After forming the auxiliary electrode layer also
Include:
Form multiple optical filters；Wherein, the optical filter is arranged in a one-to-one correspondence with the transparent area.
Solving technical solution used by present invention problem is a kind of display device, which is characterized in that including above-mentioned
Display base plate.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of display base plate of some embodiments of the present invention；
Fig. 2 is the structural schematic diagram of another display base plate of some embodiments of the present invention；
Fig. 3 is that driving transistor and organic electroluminescence are formed in the preparation method of the display base plate of some embodiments of the present invention
The structural schematic diagram of light emitting diode；
Fig. 4 is the structural schematic diagram that encapsulated layer is formed in the preparation method of the display base plate of some embodiments of the present invention.
Wherein appended drawing reference are as follows: 10, substrate；1, transistor is driven；2, organic electroluminescent LED；21, anode；22,
Luminescent layer；23, cathode；3, pixel confining layer；4, encapsulated layer；41, via hole is connected；5, electrode pattern layer；6, optical filter；9, it buffers
Layer；Q1, transparent area；Q2, shading region.
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.
Inventor's discovery: in the preparation of large-sized organic electroluminescent LED substrate, there are following technical barriers:
(1) for the substrate of the organic electroluminescent LED with three kinds of colors of red, green, blue, due to there is no large-size substrate corresponding
FMM (metal fine mask plate), therefore cannot achieve the vapor deposition of the luminescent layer of three kinds of colors of red, green, blue；(2) have for white light
Organic electro luminescent diode, exist since the intrinsic resistance of evaporation cathode and film thickness limit, on large-size substrate area compared with
Big resistance and pressure drop influences overall current uniformity and then influences display effect.In some embodiments of the invention below
A kind of display base plate is inventor provided, to solve at least one above-mentioned technical problem.
It should be noted that involved luminescent device can be organic electroluminescent two in the examples below
Pole pipe is also possible to inorganic light-emitting diode, does not limit in embodiments of the present invention the type of luminescent device, only
It is illustrated so that luminescent device is organic electroluminescent LED as an example.And the is included at least for organic electroluminescent LED
The luminescent layer of one electrode, second electrode and sandwiched between the first electrode and the second electrode；Wherein, first electrode and second
One of electrode is anode, and another one is then cathode, and is using first electrode as anode, the second electricity in embodiments of the present invention
Extremely it is illustrated for cathode.
Some embodiments of the present invention provide a kind of display base plate, including substrate, multiple organic electroluminescent LEDs,
Auxiliary electrode layer；Wherein, multiple organic electroluminescent LEDs are located in substrate, and in multiple organic electroluminescent LEDs
It each include along anode, luminescent layer, the cathode set gradually away from substrate direction；Auxiliary electrode layer and multiple organic electroluminescences are sent out
The cathode of at least one organic electroluminescent LED in optical diode is connected in parallel.
Since the cathode of each organic electroluminescent LED in usual display base plate is to be connected in series, therefore in ruler
In very little display base plate, the cathode series resistor of each organic electroluminescent LED is larger, therefore is giving each organic electroluminescence
The cathode of light emitting diode applies voltage simultaneously, then can have biggish decompression, influence the uniformity of overall current and influence to show
Show, and the display base plate of the embodiment of the present invention includes auxiliary electrode layer, and the cathode of at least one organic electroluminescent LED
It is connected in parallel with the auxiliary electrode layer, so, auxiliary electrode layer and is connected in parallel organic electroluminescent diode therewith
Cathode is then equivalent to the cathode of the organic electroluminescent LED, and the two is used and is connected in parallel, therefore resistance is obviously reduced, because
This, can effectively improve the problem of influencing display since cathode overall current is uneven.Simultaneously as the auxiliary electrode layer
Material include non-transparent material, can set at this time by the pattern in the auxiliary electrode layer is corresponding with the shading region of display base plate
It sets, therefore can be omitted the preparation of the light-shielding pattern in display base plate.Specifically, when needing the setting colorized optical filtering in display base plate
When layer, which can serve as the black matrix structure in chromatic filter layer.
Wherein, in the display base plate of the embodiment of the present invention, the anode of each organic electroluminescent LED is located at same
Layer and interval setting, the cathode of each organic electroluminescent LED formed as an integrated structure, and auxiliary electrode layer is in parallel with cathode
Connection.So, it can reduce the all-in resistance of the cathode of each organic electroluminescent LED, it is effective to improve due to resistance
Larger, caused cathode overall current is uneven and influences the problem of showing.
It should be noted that the cathode of each organic electroluminescent LED can be created as the one knot of planar
Structure is also possible to the cathode per multiple organic electroluminescent LEDs being arranged in array in each organic electroluminescent LED
A cathode block is constituted, multiple cathode blocks, which link together, is integrally formed structure.
As illustrated in fig. 1 and 2, a kind of display base plate is provided in some embodiments of the invention, is divided into shading region
Q2 and transparent area Q1, which includes: substrate 10, is located at multiple pixel units in substrate 10, every in multiple pixel units
A pixel unit includes pixel-driving circuit and organic electroluminescent LED 2；Wherein, organic electroluminescent LED 2 wraps
It includes: anode 21, luminescent layer 22, cathode 23；Driving transistor 1, the leakage of the driving transistor 1 are included at least in pixel-driving circuit
Pole is connect with the anode 21 of organic electroluminescent LED 2；The cathode 23 of each organic electroluminescent LED 2 is connected to one
It rises, and encapsulated layer 4 is set above 23 place layer of the cathode of each organic electroluminescent LED 2, to send out organic electroluminescence
Optical diode 2 is packaged, and prevents water oxygen from polluting organic electroluminescent LED 2；Auxiliary electrode layer is set above encapsulated layer 4
5, and connection via hole 41 is provided in encapsulated layer 4, auxiliary electrode layer 5 passes through connection via hole 41 and organic electroluminescent LED
2 cathode 23 connects.
It should be noted that when organic electroluminescent LED 2 is top emission type luminescent device, auxiliary electrode layer
5 should be using transparent conductive material, such as tin indium oxide (ITO) etc..
In some the present embodiment of the invention, in order to avoid connection via hole 41 influences the pixel aperture ratio of display base plate,
Therefore connection via hole 41 can be arranged in shading region Q2.Organic electroluminescent LED 2 be correspondingly arranged with transparent area Q1, and
Organic electroluminescent LED 2 is the area for being greater than transparent area Q1 via the light-emitting area of transparent area Q1 emergent light, is anti-
The transmission path that only light exposes to connection via hole 41 and influences light is being parallel to 10 place of substrate in the present embodiment
In plane, the shortest distance of each of the multiple connection via holes 41 between transparent area Q1 adjacent thereto is more than or equal to
0.5μm.Certainly, each connection the distance between via hole 41 and transparent area Q1 adjacent thereto can also be according to transparent area Q1 and screenings
The size of light area Q2 is specifically set.
In some the present embodiment of the invention, which is additionally provided with pixel confining layer 3, specifically, the pixel
Confining layers 3 are arranged in above the 21 place layer of anode of each organic electroluminescent LED 2, and include more in pixel confining layer 3
A opening, the opening and the anode 21 of organic electroluminescent LED 2 are arranged in a one-to-one correspondence, to expose organic electroluminescent
The anode 21 of diode 2, the luminescent layer 22 and cathode 23 of each organic electroluminescent LED 2 are sequentially coated on pixel confining layer
On 3.The shortest distance between opening in each of multiple connection via holes 41 and pixel confining layer 3 adjacent thereto is greater than
Or it is equal to 0.5 μm, the transmission path of light is influenced to prevent light from exposing to connection via hole 41, and influence the uniform of light
Property.
In some the present embodiment of the invention, organic electroluminescent LED 2 can use white light organic electroluminescence
Device.It why is because the luminescent layer 22 of each organic electroluminescent LED 2 can using white light organic electroluminescent device
To reduce processing step, save the cost using an evaporation process preparation.Certainly, organic electroluminescent LED 2 can also be adopted
With the organic electroluminescence device of three kinds of different colours of red, green, blue.
Display base plate not only has above-mentioned structure in some the present embodiment of the invention, can also include being located at auxiliary
Multiple optical filters 6 and black matrix 7 on 5 place layer of electrode layer；Optical filter 6 is arranged in a one-to-one correspondence with transparent area Q1, black matrix 7 and screening
Light area Q2 is arranged in a one-to-one correspondence；Namely each optical filter 6 is folded between two adjacent black matrix.When two pole of organic electroluminescent
When pipe 2 is using white light organic electroluminescent device, optical filter 6 may include the optical filter 6 of three kinds of colors of red, green, blue.
In some embodiments of the invention, transparent conductive material used by auxiliary electrode layer 5, is specifically as follows oxidation
Indium tin (ITO)；Certainly, the material of auxiliary electrode layer 5 is also not limited to this, can also use other transparent conductive materials.
A kind of preparation method of display base plate is provided in some embodiments of the invention, comprising: shape on the substrate 10
At multiple organic electroluminescent LEDs 2；Wherein, forming step in each of multiple organic electroluminescent LEDs 2 includes:
Anode 21, luminescent layer 22, cathode 23 are sequentially formed along the direction away from substrate 10.Forming each organic electroluminescent LED
In the substrate 10 of 2 cathode 23, auxiliary electrode layer 5, at least one of the auxiliary electrode layer 5 and multiple luminescent devices hair are formed
The second electrode of optical device is in parallel.
Include the steps that forming auxiliary electrode layer 5, and at least one in the preparation method of the display base plate of the embodiment of the present invention
The cathode 23 of a organic electroluminescent LED 2 is connected in parallel with the auxiliary electrode layer 5, so, auxiliary electrode layer 5 and with
The cathode 23 for being connected in parallel organic electroluminescent diode 2 be then equivalent to the cathode 23 of the organic electroluminescent LED 2, and
The two is using being connected in parallel, therefore resistance is obviously reduced, therefore, can effectively improve since 23 overall current of cathode is uneven and
The problem of influencing display.
A kind of preparation method of display base plate is provided in some embodiments of the invention, and wherein display base plate is divided into
Shading region Q2 and transparent area Q1, the preparation method specifically comprise the following steps:
As shown in figure 3, forming multiple pixel units on the substrate 10, wherein form each pixel unit including at least shape
Pixel driving circuit and organic electroluminescent LED 2；Formation pixel-driving circuit, which includes at least, forms driving transistor 1；
Forming organic electroluminescent LED 2 includes: to form anode 21, luminescent layer 22, cathode 23.
Specifically, in this step, for forming top gate type driving transistor 1；Formed driving transistor 1 include:
In substrate 10, buffer layer 9 is formed, being formed later by patterning processes includes the figure for driving the active layer of transistor 1；It is being formed
In the substrate 10 of active layer, gate insulating layer is formed；In the substrate 10 for forming gate insulating layer, is formed and wrapped by patterning processes
Include the figure of the grid of driving transistor 1；In the substrate 10 for forming grid, interlayer insulating film is formed；Forming layer insulation
In the substrate 10 of layer, being formed by patterning processes includes the figure for driving the source electrode and drain electrode of transistor 1；Wherein, source electrode and leakage
Pole through the via hole of interlayer insulating film and gate insulating layer with active layer respectively by connecting；In the substrate for forming source electrode and drain electrode
On 10, planarization layer is formed, and run through the via hole of planarization layer in the position etching of the corresponding drain electrode of planarization layer；It is flat being formed
In the substrate 10 for changing layer, the figure of the anode 21 including organic electroluminescent LED 2, the anode 21 are formed by patterning processes
It is connect by the via hole through planarization layer with the drain electrode of driving transistor 1；Pixel is formed in the substrate 10 for forming anode 21
Confining layers 3, and etching is open correspondingly with anode 21 in forming confining layers, so that anode 21 is in pixel confining layer 3
Aperture position exposure；In the substrate 10 for forming pixel confining layer 3, luminescent layer 22 and 23 layers of cathode are successively deposited；Wherein, it shines
The material of layer 22 may include white light emitting material；The cathode 23 of each organic electroluminescent LED 2 links together.
As shown in figure 4, in 23 substrate 10 of cathode for forming organic electroluminescent LED 2, formation encapsulated layer 4, and
The position etching connection via hole 41 of the corresponding shading region Q2 of encapsulated layer 4, the connection via hole 41 is to will following auxiliary to be formed
Electrode layer 5 and the cathode 23 of organic electroluminescent LED 2 are connected in parallel.
In this step, it in order to avoid connection via hole 41 influences the pixel aperture ratio of display base plate, therefore can will connect
Hole 41 is arranged in shading region Q2.Organic electroluminescent LED 2 is correspondingly arranged with transparent area Q1, and organic electroluminescent two
Pole pipe 2 is the area for being greater than transparent area Q1 via the light-emitting area of transparent area Q1 emergent light, to prevent light from exposing to company
It takes over hole 41 and influences the transmission path of light, in the present embodiment, in the plane being parallel to where substrate 10, multiple connections
The shortest distance between each of via hole 41 and transparent area Q1 adjacent thereto is more than or equal to 0.5 μm.Similarly, Duo Gelian
The shortest distance taken between the opening in each of hole 41 and pixel confining layer 3 adjacent thereto is more than or equal to 0.5 μ
M, the transmission path of light is influenced to prevent light from exposing to connection via hole 41, and influences the uniformity of light.
As shown in Figure 1, being formed by patterning processes includes auxiliary electrode layer 5 in the substrate 10 for forming encapsulated layer 4, and
The auxiliary electrode layer 5 is connected in parallel by the cathode 23 of contact via hole and organic electroluminescent LED 2.
In this step, specific auxiliary electrode layer 5 can be planar structure.Wherein, auxiliary electrode layer 5 may include oxygen
Change indium tin (ITO), when auxiliary electrode layer 5 with a thickness ofWhen, sheet resistance is 0.7 or so, and the sheet resistance of usually cathode 23
About 10-20, so, the addition of auxiliary electrode layer 5 can at least allow whole screen resistance to decline ten times or more, i.e. current boost
Ten times or more.
As shown in Fig. 2, forming optical filter 6 and black matrix 7 in the substrate 10 for forming auxiliary electrode layer 5；Wherein, it filters
Piece 6 is arranged in a one-to-one correspondence with transparent area Q1；Black matrix is arranged in a one-to-one correspondence with shading region Q2.
In this step, specific optical filter 6 may include the optical filter 6 of three kinds of different colours of red, green, blue；Optical filter 6
It is arranged in a one-to-one correspondence with transparent area Q1 namely each optical filter 6 is folded between two adjacent black matrix 7, there is no need to prepare
Black matrix.
A kind of display device is additionally provided in some embodiments of the invention, which includes above-mentioned display base
Plate.
Wherein, display device can be OLED display, such as mobile phone, tablet computer, television set, display, notes
Any products or components having a display function such as this computer, 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 (12)
1. a kind of display base plate characterized by comprising
Substrate；
Multiple luminescent devices are located in the substrate；Wherein, each luminescent device includes: in the multiple luminescent device
One electrode, luminescent layer and second electrode；
The second electrode of at least one luminescent device in auxiliary electrode layer, with the multiple luminescent device is connected in parallel.
2. display base plate according to claim 1, which is characterized in that each luminescent device in the multiple luminescent device
The setting of first electrode interval；The second electrode of each luminescent device in the multiple luminescent device forms integral structure, described auxiliary
Electrode layer is helped to be connected in parallel with the second electrode.
3. display base plate according to claim 1 or 2, which is characterized in that the display base plate is divided into transparent area and screening
Light area；The display base plate further include: be arranged between the second electrode of the multiple luminescent device and the auxiliary electrode layer
Encapsulated layer；Wherein,
Multiple connection via holes are provided in the encapsulated layer, the multiple connection via hole is located at the shading region；The auxiliary
Electrode layer is connect by connecting via hole with the second electrode.
4. display base plate according to claim 3, which is characterized in that in the plane being parallel to where the substrate, institute
It states the shortest distance of each of the multiple connection via holes between transparent area adjacent thereto and is more than or equal to 0.5 μm.
5. display base plate according to claim 3, which is characterized in that the display base plate further include: pixel confining layer, institute
Stating pixel confining layer includes multiple openings, and each of the multiple opening exposes each luminous in the multiple luminescent device
The first electrode of device；Wherein,
The shortest distance between opening in each of the multiple connection via hole and the pixel confining layer adjacent thereto
More than or equal to 0.5 μm.
6. display base plate according to claim 1 or 2, which is characterized in that the display base plate is divided into transparent area and screening
Light area；The display base plate further includes multiple optical filters and black matrix；Wherein,
Each optical filter in the multiple optical filter is arranged in a one-to-one correspondence with the transparent area；
The black matrix is arranged in a one-to-one correspondence with the shading region.
7. display base plate according to claim 1 or 2, which is characterized in that the display device includes white light organic electroluminescence
Luminescent device.
8. display base plate according to claim 1 or 2, which is characterized in that the material of the auxiliary electrode includes transparent leads
Electric material.
9. a kind of preparation method of display base plate characterized by comprising
Multiple luminescent devices are formed on the substrate；Wherein, the step of forming each luminescent device in the multiple luminescent device packet
It includes: forming first electrode, luminescent layer and second electrode；
Form auxiliary electrode layer, the auxiliary electrode layer and second of at least one luminescent device in the multiple luminescent device
Electrode is in parallel.
10. the preparation method of display base plate according to claim 9, which is characterized in that the display base plate is divided into screening
Light area and transparent area；Between in the second electrode for forming the multiple luminescent device and the step of form the auxiliary electrode layer,
Further include:
Encapsulated layer is formed, and is formed with multiple connection via holes in the encapsulated layer, the multiple connection via hole is located at the screening
Light area；The auxiliary electrode layer is connect by connecting via hole with the second electrode.
11. the preparation method of display base plate according to claim 9, which is characterized in that the display base plate is divided into screening
Light area and transparent area；After forming the auxiliary electrode layer further include:
Form multiple optical filters；Wherein, the optical filter is arranged in a one-to-one correspondence with the transparent area.
12. a kind of display device, which is characterized in that including display base plate of any of claims 1-8.
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