CN104409471B - A kind of display base plate and its application method, polymer electroluminescent device - Google Patents
A kind of display base plate and its application method, polymer electroluminescent device Download PDFInfo
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- CN104409471B CN104409471B CN201410613717.3A CN201410613717A CN104409471B CN 104409471 B CN104409471 B CN 104409471B CN 201410613717 A CN201410613717 A CN 201410613717A CN 104409471 B CN104409471 B CN 104409471B
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Abstract
An embodiment of the present invention provides a kind of display base plate and its application method, polymer electroluminescent devices, belong to light emitting device field, uniformity to solve the problems, such as the film made of solution in the luminous zone of polymer electroluminescent device is relatively low, to improve its display quality.The display base plate includes：Luminous zone at the display base plate center, and the virtual pixel area around the luminous zone are set；Wherein, it is equipped with around the trench area of the luminous zone in the virtual pixel area.The present invention can be used for the manufacture of polymer electroluminescent device.
Description
Technical field
The present invention relates to light emitting device field more particularly to a kind of display base plate and its application method, polymer electro hairs
Optical device.
Background technology
Polymer electroluminescent device (PLED) has self-luminous, high brightness, wide viewing angle, low power consuming, thickness ultrathin etc. excellent
Point is a kind of potential flat-panel display device.
In order to realize the high efficiency industrialization production of polymer electroluminescent device, inkjet printing technology is now mostly used to make
Make polymer electroluminescent device.As its name suggests, inkjet printing technology dissolves the solution of carrier transmission material, luminescent material
It is used as ink, the son using micron-sized printing head by emitting ink on the ITO substrates having had already patterned in a solvent
In pixel hole, and then drying and forming-film, form each luminescence unit.Inkjet printing technology can greatly save expensive luminous material
Material, and the film time can substantially be shortened by the nozzle printing of more jet ports.
However, it is found by the inventors that during making luminescent device using inkjet printing technology, in the area edge that shines
Pixel is more volatile, causes solution from the district center that shines to edge flowing, to drive solute to be migrated to luminous area edge and most
It is deposited on luminous area edge eventually.Since the drying atmosphere of luminous zone edge pixel is different from the drying atmosphere of center pixel so that
The luminescence unit drying at edge is very fast, and solute is caused to be deposited on the edge of luminous zone too much, so as to cause in luminous zone by
The uniformity of film made of solution is relatively low, and then has seriously affected the display quality of polymer electroluminescent device.
Invention content
An embodiment of the present invention provides a kind of display base plate and its application method, polymer electroluminescent devices, to solve
The relatively low problem of the uniformity of film is made of solution in the luminous zone of polymer electroluminescent device, to improve its display product
Matter.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
An embodiment of the present invention provides a kind of display base plates, including：
Luminous zone at the display base plate center, and the virtual pixel area around the luminous zone are set；
Wherein, it is equipped with around the trench area of the luminous zone in the virtual pixel area.
Optionally, it is tightly attached to the luminous zone on the inside of the trench area.
Optionally, the width in the width of the trench area≤virtual pixel area, and the width in the virtual pixel area
For the width of 1-3 pixel.
Further, which is characterized in that the width of the trench area is the width of 3 pixels.
Optionally, which is characterized in that the depth of the trench area is identical as the height of single pixel.The present invention also provides
A kind of polymer electroluminescent device includes the display base plate as described in any of the above-described technical solution.
The present invention also provides a kind of application methods of the display base plate as described in any of the above-described technical solution, including：
The first ink is added in the trench area around luminous zone, and remains in the trench area added with described the
One ink；
Inkjet printing is carried out using the second ink in the luminous zone, to form luminescence unit.
Optionally, first ink is mixed to form by second ink with solvent, and the boiling point of first ink
Higher than second ink.
Further, the boiling point of the solvent is 130 DEG C -280 DEG C.
Optionally, the solvent is one or more in alcohol, ether, cyclammonium, cyclic ester type organic.
An embodiment of the present invention provides a kind of display base plate and its application method, polymer electroluminescent devices, wherein
Display base plate is equipped with around the trench area of luminous zone, when luminous zone forms luminescence unit, is led to using inkjet printing technology
After ink is added in trench area in advance so that luminous zone center pixel and edge pixel have (i.e. close to the pixel of trench area)
Identical dry atmosphere, to avoid luminous area edge luminescence unit dry it is too fast caused by ink in solute (i.e. shine
Material) phenomenon excessive in luminous zone marginal deposit, to improve the uniformity of the film made of solution in luminous zone, Jin Erti
The high display quality of luminescent device.
Description of the drawings
Fig. 1 is the structural schematic diagram of display base plate provided in an embodiment of the present invention；
Fig. 2 is the uniformity schematic diagram of the film made of solution in the luminous zone that the embodiment of the present invention 1 provides；
Fig. 3 is the uniformity schematic diagram of the film made of solution in the luminous zone that comparative example provides.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Below in conjunction with the accompanying drawings to display base plate provided in an embodiment of the present invention and its application method, polymer electroluminescence device
Part is described in detail.
Fig. 1 is the structural schematic diagram of display base plate provided in an embodiment of the present invention.As shown in Figure 1, the embodiment of the present invention carries
A kind of display base plate has been supplied, including：Luminous zone 1 at the display base plate center, and the void around the luminous zone 1 are set
Quasi- pixel region 2；Wherein, the trench area 3 around the luminous zone 1 is equipped in the virtual pixel area 2.
Currently, inkjet printing technology is more commonly used luminescent device manufacturing technology, its working principle is that：Material will be transmitted
Ink solution is made as solute in material, luminescent material, is served as a contrast ITO electro-conductive glass of the emitting ink on substrate by printing head
In the sub-pixel hole at bottom, then the solvent in ink gradually evaporates, finally solute (i.e. luminescent material) is deposited on substrate and
Form luminescence unit.In above process, the drying atmosphere of 1 edge pixel of luminous zone is different from the drying atmosphere of center pixel
(liquid environment other than 1 edge of luminous zone is insufficient) so that the solvent in ink is mainly evaporated at 1 edge of luminous zone, from
And cause ink from 1 center pixel of luminous zone to edge flowing, and solute is driven to be migrated to 1 edge of luminous zone, finally make to shine
Area deposits more solute on 1 edge, causes the uniformity of the film made of solution in luminous zone 1 relatively low.However, non-uniform
The chance that hole is emitted directly toward cathode can be provided by being formed by path between the film layer that shines, and these complicated paths can make
Leakage current increases, therefore the phenomenon will seriously affect the display quality of polymer electroluminescent device.
In view of the above-mentioned problems, the display base plate that the embodiment of the present invention is provided is equipped in virtual pixel area 2 around described
The trench area 3 of luminous zone 1.It is pre- by being added in the trench when manufacturing polymer electroluminescent device using the display base plate
The ink first configured can provide dry atmosphere identical with center pixel for the edge pixel of luminous zone 1, and for by luminous zone
1 center flows extrorse solute and provides receiving place, and excessive solute is deposited on the edge pixel to avoid luminous zone 1, to
Solve the problems, such as that the uniformity of the film made of solution in luminous zone 1 is relatively low well.It is understood that above-mentioned trench area
3 can be manufactured by the method for photoetching, not described excessively herein, however, those skilled in the art can also be according to practical feelings
Condition selects other suitable method manufacture groove areas 3.
An embodiment of the present invention provides a kind of display base plates, are equipped with around luminous on display base plate provided in this embodiment
The trench area 3 in area 1, when using inkjet printing technology in the formation luminescence unit of luminous zone 1, by adding in trench area 3 in advance
Enter ink so that 1 center pixel of luminous zone and edge pixel (i.e. close to the pixel of trench area 3) dry atmosphere having the same,
The solute (i.e. luminescent material) in too fast caused ink is dried in luminous zone 1 to avoid the luminescence unit at 1 edge of luminous zone
The excessive phenomenon of marginal deposit, to improve the uniformity of the film made of solution in luminous zone 1, and then improves photophore
The display quality of part.
In one embodiment of this invention, the luminous zone 1 is tightly attached in the inside of the trench area 3.In the present invention, if
The purpose for setting trench area 3 be in order to enable the edge pixel of luminous zone 1 and center pixel to keep identical dry atmosphere, because
This, trench area 3 should be as possible close to luminous zone 1, to provide the drying atmosphere consistent with center pixel for edge pixel well.
In another embodiment of the present invention, the width in width≤virtual pixel area 2 of the trench area 3, and institute
The width for stating virtual pixel area 2 is the width of 1-3 pixel.Virtual pixel area 2 does not shine usually.The embodiment of the present invention is by ditch
Slot area 3 is arranged within virtual pixel area 2, so that it had not only been interfered with the normal luminous of luminous zone 1, but also do not interfere with encapsulation region
Normal encapsulation.(the virtual pixel area 2 of such as 14 inches substrates is with two for the width with 1-3 pixel mostly in virtual pixel area 2
The width of pixel), the width for the trench area 3 that the present embodiment is provided may also set up within the above range, however, art technology
Also suitable groove width can be arranged according to the actual size of luminous zone in personnel.
In one more embodiment of the present invention, preferably the width of the trench area 3 is the width of 3 pixels.The above
It has been already mentioned that the effect of trench area 3 is that 1 edge pixel of luminous zone is made to have dry atmosphere identical with center pixel when dry
It encloses, therefore the ink in trench area 3 should be able to keep undried state for a long time, to ensure edge pixel in entire inkjet printing
All there is same dry atmosphere in the process.It follows that the width of trench area 3 should be expanded as much as possible, it is more to accommodate
Ink.The embodiment of the present invention sets the width of trench area 3 to the width (i.e. the maximum width in virtual pixel area 2) of 3 pixels,
So that the quantity of ink that trench area 3 can accommodate reaches under the premise of not influencing luminous zone 1 and encapsulation region 3 normally plays its function
Maximum, this makes it possible to make edge pixel obtain best drying atmosphere, to improve the film made of solution in luminous zone 1
Uniformity.
In another embodiment of the present invention, the depth of the trench area 3 is identical as the height of single pixel.About should use up
Amount expands the ink that trench area 3 can accommodate, to ensure that edge pixel all has same do in entire ink jet printing process
Dry atmosphere, the above is it has been already mentioned that details are not described herein again.It should be noted that in general, display base plate includes pixel defines
Layer, the film layer are used to cover other regions that light-emitting zone is removed on display base plate, and thickness is mostly the height of single pixel, by ditch
The depth in slot area 3 is set as the height of single pixel, can reasonably utilize on the display base plate occupied by pixel defining layer
Space farthest expands the quantity of ink that trench area 3 can accommodate, to more preferable under the premise of not damaging display base plate
Ground provides suitable dry atmosphere for edge pixel, it is to be understood that those skilled in the art can also be according to actual conditions
The depth of trench area 3 is set.
The embodiment of the present invention additionally provides a kind of polymer electroluminescent device, including as described in any of the above-described technical solution
Display base plate.Polymer electroluminescent device provided in an embodiment of the present invention includes above-mentioned display base plate, it is made to be not only able to
Solve that the uniformity in the luminous zone of existing polymer electroluminescent device by the film made by solution is lower to ask well
Topic, moreover it is possible to further increase the display quality of polymer electroluminescent device.
The embodiment of the present invention additionally provides a kind of application method of the display base plate as described in above-described embodiment, including：
The first ink is added in the trench area 3 of luminous zone 1, and remains and is added with first ink in the trench area 3；
Inkjet printing is carried out using the second ink in the luminous zone 1, to form luminescence unit.
In ink jet printing process, since the drying of the second ink is started simultaneously at inkjet printing substantially, so should beat
It prints and distributes in the forward direction trench area 3 of light unit and the first ink is added, so that the second ink has been had when starting dry good dry
Dry atmosphere, preferably to play the function for the display base plate that the embodiment of the present invention is provided.
It is beaten selected from dispensing, printing and ink-jet it should be noted that method used by the first ink is added in trench area 3
One kind of India and China.Wherein, the advantage of lower cost but precision of dispensing technology are relatively low, and printing technology is suitble to mass production but is easy to
Pollution is generated, and relative to the above two, inkjet printing technology cost is relatively low, precision is high, and is readily produced, however, this field
Technical staff can select most suitably used technology so that the first ink is added to trench area according to actual conditions.
The embodiment of the present invention additionally provides a kind of application method of display base plate, before the printing for carrying out luminous zone 1, to
The first ink is added in the trench area 3 of luminous zone 1, do identical with center pixel is provided for the edge pixel of luminous zone 1
Dry atmosphere, to avoid the luminescence unit that the solute in ink is deposited in edge pixel on caused edge pixel too quickly thicker
The phenomenon that, and then the uniformity of the film made of solution in luminous zone 1 is improved, the final display quality for improving luminescent device.It should
Method is easy to operate, raw material sources are extensive, and is easily achieved large-scale use.
In one more embodiment of the present invention, first ink is mixed to form by second ink with solvent, and institute
The boiling point for stating the first ink is higher than second ink.It should be noted that the boiling point of the first ink should be higher than that the second ink
Boiling point, this is because when solvent is more volatile, even if being filled with ink in trench area 3, it is also possible to printed in luminous zone 1
It is finished at drying before, it is therefore desirable to higher first ink of boiling point, to ensure the trench area before the printing completion of luminous zone 1
Inside also there are the first enough inks, and the drying atmosphere of edge pixel is enable to keep identical as the drying atmosphere of center pixel.
It should be noted that when the more difficult volatilization of solvent, the first ink and the second ink are alternatively same ink, this is because more difficult wave
The solvent of hair can make ink keep undried state for a long time, to which the edge pixel for being always luminous zone 1 provides suitably
Dry atmosphere.It is understood that can also come higher than the mode of the concentration of the second ink by using the concentration of the first ink
The volatility for reducing the first ink, to ensure that edge pixel all has during entire inkjet printing manufactures luminescence unit
Suitable dry atmosphere.
In another embodiment of the present invention, between the boiling spread of the solvent is 130 DEG C -280 DEG C.In ordinary circumstance
Under, inkjet printing make luminescence unit drying temperature at 100 DEG C hereinafter, but in order to preferably improve the boiling of the first ink
Point now mixes the solvent that boiling point is 130 DEG C -280 DEG C to form the first ink with the second ink, so that the first ink is had higher
Boiling point, to keep the first ink not volatile, ensure edge pixel in entire ink jet printing process all keep with middle imago
The identical dry atmosphere of element.
In one more embodiment of the present invention, one kind in alcohol, ether, cyclammonium, cyclic ester type organic of the solvent or
It is a variety of, since during printing luminescence unit using inkjet printing technology, solute (i.e. luminescent material) need to be made by solvent
It is deposited on substrate, therefore should ensure that solute has good dissolubility for the solvent, ensure solute and the solvent again
It is not likely to produce reaction at relatively high temperatures and goes bad, also to ensure that the solvent has a degree of volatility.Therefore, of the invention
Embodiment selected from above-mentioned organic matter it is at least one as solvent, the second ink is mixed to form the first ink, from
And the boiling point of the first ink is made to be higher than the second ink, disclosure satisfy that the needs for making polymer electroluminescent device.It needs
It is bright, the solvent mainly include 1,2-PD, polyethylene glycol, diethylene glycol (DEG), dimethyl sulfoxide, n,N-Dimethylformamide,
It is one or more in ethylene glycol ethyl ether, but it is not limited to above-mentioned organic matter, those skilled in the art can be according to practical feelings
Condition selects suitable organic matter as solvent.
Display base plate and its application method, the polymer electroluminescent device provided in order to better illustrate the present invention, under
Face is described in detail with specific embodiment.
Embodiment 1
In the present embodiment, polymer electroluminescent device, the substrate are made using display base plate provided by the present invention
For 14 inches of substrates, virtual pixel sector width is the width of two pixels, by way of photoetching in virtual pixel area shape
At trench area, the width of trench area is equal to the width (width of i.e. two pixels) in virtual pixel area.
The process that polymer electroluminescent device is made by inkjet printing technology is as follows：Using luminescent material as solute,
Volatile organism prepares the second ink as solvent；By the second ink and 1,2- mixed with propylene glycol to prepare the first ink；Profit
The first ink is added in the trench area on substrate with dispensing technology, and remains and is added with described first in the trench area
Ink；Inkjet printing is carried out on luminous zone using the second ink, so that the second ink dried is formed a film, is ultimately formed luminescence unit；
Finally by encapsulation, the making of polymer electroluminescent device is completed.
The luminous area edge of substrate obtained by the present embodiment is sampled and is observed and is analyzed, Fig. 2 institutes diagram can be obtained
Picture, wherein sampling ranging from from luminous zone boundary to luminous zone inside and away from luminous zone boundary 0.1mm from, abscissa representative sample
This distance away from luminous zone boundary, the relative thickness of ordinate representative sample film forming.It is understood that the curved shape in Fig. 2
Shape as samples the outline drawing of film made of the solution in range.
Comparative example
Comparative example provides a kind of polymer electroluminescent device manufactured using the prior art, and display base plate is 14 English
Very little substrate, virtual pixel sector width are the width of two pixels.Since the manufacturing process of its entire device is same as Example 1,
Details are not described herein again.
The luminous area edge of substrate obtained by this comparative example is sampled and is observed, image shown in Fig. 3 can be obtained,
In, the physical quantity sampled representated by range and transverse and longitudinal coordinate is same as Example 1.
Comparison diagram 2 and 3 is it is found that the film layer that embodiment 1 samples this remains at 8nm or so, this explanation is in embodiment 1
In, the uniformity of made film is higher in luminous zone；And the film layer in comparative example is up to 18nm in luminous area edge, and away from
It is then 8nm at the 0.1mm of luminous zone, in the comparative example, the uniformity of made film is relatively low in luminous zone for this explanation.It is possible thereby to
Fully illustrate, display base plate provided by the present invention can effectively improve the uniformity of the film forming of luminous zone, to improve
The display quality of polymer light-emitting device.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
Change the protection domain still in the invention.
Claims (8)
1. a kind of display base plate, which is characterized in that including：
Luminous zone at the display base plate center, and the virtual pixel area around the luminous zone are set；
Wherein, it is equipped in the virtual pixel area and is tightly attached on the inside of the trench area of the luminous zone, the trench area
The luminous zone；
When making luminescence unit, the first ink is added in the trench area around luminous zone, and remains the trench area
In be added with first ink, in the luminous zone using the second ink progress inkjet printing, to form luminescence unit；Institute
It states the first ink to be mixed to form with solvent by second ink, and the boiling point of first ink is higher than second ink
Boiling point, the virtual pixel area and the trench area region that be located at display base plate different.
2. display base plate according to claim 1, which is characterized in that the width of the trench area≤virtual pixel area
Width, and the width in the virtual pixel area be 1-3 pixel width.
3. display base plate according to claim 2, which is characterized in that the width of the trench area is the width of 3 pixels.
4. display base plate according to claim 1, which is characterized in that the height of the depth of the trench area and single pixel
It is identical.
5. a kind of polymer electroluminescent device, which is characterized in that including display base according to any one of claims 1-4
Plate.
6. a kind of application method according to claim 1-4 any one of them display base plates, which is characterized in that including：
The first ink is added in the trench area around luminous zone, and remains in the trench area added with first ink
Water；
Inkjet printing is carried out using the second ink in the luminous zone, to form luminescence unit；
Wherein, first ink is mixed to form by second ink with solvent, and the boiling point of first ink is higher than institute
State the boiling point of the second ink.
7. application method according to claim 6, which is characterized in that the boiling spread of the solvent is 130 DEG C -280 DEG C.
8. application method according to claim 7, which is characterized in that the solvent, which is selected from alcohol, ether, cyclammonium, cyclic esters, to be had
It is one or more in machine object.
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| CN105720084A (en) * | 2016-04-06 | 2016-06-29 | 广东聚华印刷显示技术有限公司 | Display panel suitable for printing technology and display |
| CN107732026A (en) * | 2017-10-16 | 2018-02-23 | 深圳市华星光电半导体显示技术有限公司 | OLED substrate structure |
| CN109080266B (en) * | 2018-08-21 | 2019-11-19 | 京东方科技集团股份有限公司 | A kind of printing board |
| CN109686872B (en) * | 2018-12-20 | 2021-03-16 | 深圳市华星光电半导体显示技术有限公司 | Preparation method of OLED device |
| CN110416428B (en) * | 2019-07-22 | 2021-12-28 | Tcl华星光电技术有限公司 | Display panel manufacturing method and display panel |
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| CN102226998A (en) * | 2011-06-15 | 2011-10-26 | 友达光电股份有限公司 | Organic light-emitting pixel array |
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| CN1293784C (en) * | 1998-03-17 | 2007-01-03 | 精工爱普生株式会社 | Substrate for patterning thin film and surface treatment thereof |
| JP3628997B2 (en) * | 2000-11-27 | 2005-03-16 | セイコーエプソン株式会社 | Method for manufacturing organic electroluminescence device |
| JP4211804B2 (en) * | 2006-05-19 | 2009-01-21 | セイコーエプソン株式会社 | Device, film forming method and device manufacturing method |
| KR102052331B1 (en) * | 2012-12-10 | 2019-12-06 | 삼성디스플레이 주식회사 | Inkjet print head, apparatus and method using the same for manufacturing organic luminescence display |
| US9614191B2 (en) * | 2013-01-17 | 2017-04-04 | Kateeva, Inc. | High resolution organic light-emitting diode devices, displays, and related methods |
| CN103367391B (en) * | 2013-06-28 | 2016-03-23 | 京东方科技集团股份有限公司 | Pixel defines the manufacture method of layer |
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| CN102226998A (en) * | 2011-06-15 | 2011-10-26 | 友达光电股份有限公司 | Organic light-emitting pixel array |
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