CN203787433U - OLED display member and display device - Google Patents
OLED display member and display device Download PDFInfo
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- CN203787433U CN203787433U CN201420155336.0U CN201420155336U CN203787433U CN 203787433 U CN203787433 U CN 203787433U CN 201420155336 U CN201420155336 U CN 201420155336U CN 203787433 U CN203787433 U CN 203787433U
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Abstract
The utility model relates to the display technology field and discloses an OLED display member and a display device. The OLED display member comprises a first electrode array, a pixel definition layer, an organic light emitting layer and a second electrode, wherein the pixel definition layer is arranged among first electrodes, and the organic light emitting layer and the second electrode are sequentially arranged above the first electrode array. The OLED display member is characterized in that width of a cross section of the pixel definition layer is largest in the middle portion and decreases gradually from the middle portion to two tail end portions. The OLED display member weakens the coffee-ring effect of the organic light emitting layer, a second electrode fault phenomenon does not occur, and thereby the display effect is improved, and the material of the second electrode is saved.
Description
Technical field
The utility model relates to Display Technique field, particularly a kind of OLED display device and display unit.
Background technology
Organic electroluminescence device (OLED) with respect to LCD there is self-luminous, reaction is fast, visual angle is wide, brightness is high, the advantage such as bright in luster and frivolous, is considered to Display Technique of future generation.
The thin film-forming method of OLED material mainly comprises evaporation processing procedure and solution processing procedure.Evaporation processing procedure is comparatively ripe in small size application, and this technology is applied in volume production at present, and solution processing procedure OLED material filming mode mainly contains inkjet printing, nozzle coating, spin coating and silk screen printing etc.Wherein inkjet technology, because its stock utilization is higher, it is in large size to realize, is considered to the important way that large scale OLED realizes volume production.
Inkjet printing technique needs on the electrode of substrate, to make in advance pixel and defines layer (PDL), flows into accurately the R/G/B sub-pix district of appointment to limit the ink droplet of luminous organic material.
PDL structural section shape has two kinds of trapezoid (shown in Fig. 1) and inverted trapezoidals (shown in Fig. 2):
Trapezoid structure applications in Fig. 1 is comparatively extensive, is the array of the first electrode 120 on flatness layer 110, between the first electrode 120, is PDL130.Because the PDL130 contact position of luminous organic material 140 ink droplets and trapezoid is because surface energy differential is different between the two, and the dry behavior of luminous organic material 140 self, easily form edge after dry high, the inhomogeneous film of intermediate thin, if Fig. 1 is as shown in dotted line frame, it is also coffee toroidal effect.If avoid coffee toroidal effect, not only need the PDL material of function admirable and the solvent composition of meticulous adjusting ink, and need accurately to control the membrance casting conditions such as the dry temperature of ink droplet, pressure, atmosphere, this has increased the cost of display device, has also strengthened the difficulty of research and development.
In order to solve coffee ring problem, Fig. 2 shows another kind of structure, is the array of the first electrode 220 on flatness layer 210, between the first electrode 220, is PDL230.Wherein, PDL230 is inverted trapezoidal structure, because angle between the PDL230 of this inverted trapezoidal itself and electrode is less than 90 °, there is capillary structure, luminous organic material 240 ink droplets, under the active force of edge capillary structure, are sprawled comparatively evenly, and this greatly reduces the difficulty of film-forming process exploitation.But on the other hand, in deposition cathode 250, inverted trapezoidal PDL230 structure easily causes the tomography of negative electrode, thereby causes cathode pixels open defect, particularly when the thickness of negative electrode 250 is not enough to pave the pit between PDL230.In order to prevent the generation of negative electrode tomography, often need the negative electrode 250 of evaporation decades of times thickness to pave pit, this has significantly increased time and the cost of element manufacturing and device transmitance is reduced.
Utility model content
(1) technical problem that will solve
The technical problems to be solved in the utility model is: how to realize that technique is simple, cost is relatively low, and the smooth OLED display device of film forming.
(2) technical scheme
The utility model provides a kind of OLED display device, comprise that the first electrod-array, pixel define layer, organic luminous layer and the second electrode, pixel defines layer between the first electrode, on the first electrod-array, be followed successively by organic luminous layer and the second electrode, it is wide that the width that described pixel defines layer cross section is middle part, the trend that the width of top and the bottom reduces successively.
Wherein, the thickness of described organic luminous layer is not less than the height that described pixel defines layer middle part the widest part.
Wherein, described pixel define layer thickness be 0.1um～100um.
Wherein, described pixel define layer thickness be 1um～5um.
Wherein, described pixel define layer material comprise: resin, polyimides, organosilicon or SiO
2.
Wherein, described pixel define layer middle part the widest part divide the face that is clipped to top and the bottom to be plane, cambered surface or to be notch cuttype.
Wherein, described pixel define layer cross section be hexagon or ellipse.
The utility model also provides a kind of display unit, comprises the OLED display device described in above-mentioned any one.
(3) beneficial effect
It is wide that the width that the pixel of OLED display device of the present utility model defines layer cross section is middle part, the trend that the width of top and the bottom reduces successively.Be that pixel defines layer bottom and the first electrode (anode) has the angle that is less than 90 °, possessed capillary structure, during inkjet printing, during luminous organic material ink droplet, under the attraction of capillary structure, sprawl more even; Even if the irregular coffee toroidal effect of while marginal existence, the structure that also can be given prominence to by middle part in luminous is blocked, and effectively light-emitting zone brightness still can be more even, thereby effectively improved display quality; On the other hand, it is narrower that pixel defines layer top, forms certain toe, can make the thickness of organic luminous layer just arrive pixel and define a layer middle part the widest part, avoided inverted trapezoidal structure to have the defect of the second electrode (negative electrode) tomography during evaporation negative electrode like this; And negative electrode can do thinly, increase transmitance, reduce cathode material cost.
Accompanying drawing explanation
Fig. 1 is a kind of OLED display device structural representation of prior art;
Fig. 2 is the another kind of OLED display device structural representation of prior art;
Fig. 3 is a kind of OLED display device manufacture method flow chart of the utility model embodiment;
Fig. 4 a forms the structural representation of the first electrod-array on flatness layer in a kind of OLED display device manufacture method of the utility model embodiment;
Fig. 4 b forms the structural representation after one deck photoresist on the basis of Fig. 4 a;
Fig. 4 c is the structural representation adopting on the basis of Fig. 4 b after a kind of Exposure mode exposes for the first time to photoresist;
Fig. 4 d is that after photoresist being exposed for the second time on the basis of Fig. 4 c, Formation cross-section is the structural representation that hexagonal pixel defines layer cross section;
Fig. 4 e is the structural representation adopting on the basis of Fig. 4 b after another kind of Exposure mode exposes for the first time to photoresist;
Fig. 4 f is that after photoresist being exposed for the second time on the basis of Fig. 4 e, Formation cross-section is the structural representation that hexagonal pixel defines layer cross section;
Fig. 4 g defines on the first electrode between layer and forms the structural representation after luminous organic material in pixel on the basis of Fig. 4 e;
Fig. 4 h is the OLED display device structural representation forming in a kind of OLED display device manufacture method of the utility model embodiment;
Fig. 5 is the structural representation that the pixel of the another kind of cross sectional shape that forms in the method for the utility model embodiment defines layer cross section;
Fig. 6 is the structural representation that the pixel of another cross sectional shape (ellipse) of forming in the method for the utility model embodiment defines layer cross section.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for illustrating the utility model, but are not used for limiting scope of the present utility model.
The utility model provides a kind of OLED display device manufacture method, as shown in Figure 3, comprises the following steps:
Step S310 forms the array that comprises the first electrode on underlay substrate, and the region that described the first electrode pair is answered is viewing area.
Step S320 forms pixel and defines layer between described the first electrode, and the width that makes described pixel define layer cross section be middle part wide, the trend that the width of top and the bottom reduces successively.
Step S330, defines on the first electrode between layer and forms organic luminous layer in described pixel.
Step S340 at least forms the second electrode on described organic luminous layer.
In the present embodiment, step S310 specifically as shown in Fig. 4 a,
On underlay substrate, form the figure that comprises the first electrode 420 arrays.For OLED display device, conventionally on underlay substrate, be formed with the flatness layer of thin-film transistor (TFT) array of structures and top thereof, the first electrod-array is formed on flatness layer top, and connects TFT by via hole.As shown in Fig. 4 a, show the figure of the first electrode 420 arrays of flatness layer 410 and the side of being located thereon.The first electrode 420 is generally anode, connects the drain electrode of the driving thin-film transistor in thin-film transistor structure.The region of the first electrode 420 correspondences is viewing area, after follow-up formation luminous organic material and the second electrode (negative electrode), and this region luminescence display.
At flatness layer, 410(is generally resin material) mode of upper the first electrode 420 forming can adopt existing composition technique (on the first electrode film surface, to form photoresist, adopt mask plate to carry out exposure imaging to photoresist, the first electrode film exposing is carried out to etching, finally forms the array of the first electrode 420) form.Because OLED device has luminous two kinds of luminous and top, the end, by settings, there is the device architecture that transparent anode and reflexive cathode construction form end transmitting, otherwise forming, structure by transparent cathode and reflection anode pushes up luminous device architecture.Therefore different according to device architecture, the selection of anode material is also different, normally the transparent or semitransparent material of ITO, Ag, NiO, Al or the contour work content of Graphene.
In the present embodiment, for step S320, it is wide that the width that below provides pixel that two kinds of different production methods make to form to define layer cross section is middle part, trend that the width of top and the bottom reduces successively.
Mode one:
As shown in Figure 4 b, on the substrate after forming the first electrode 20, form one deck photoresist 430 ＇.The mode that forms photoresist 430 ＇ comprises the modes such as spin coating, blade coating, and the thickness of photoresist is 0.1um～100um, preferably 1～5um.
As shown in Fig. 4 c, make light be the first predetermined incidence angle α photolithography glue 430 ＇ by mask plate and underlay substrate, 90 ° of 0 ° of < α <, 75 ° of 45 ° of < α < of optimized angle, to facilitate technique to realize.To photoresist, 430 ＇ expose for the first time, and wherein photoresist is positive photoresist.Light irradiates photoresist 430 ＇ corresponding to top, viewing area with angle [alpha].Owing to being oblique illumination, so the photoresist cross section parallelogram of unexposed area, wherein the angle of limit and the first electrode 420 should be 90 °-α in theory.
As shown in Fig. 4 d, then make light be predetermined the second incidence angle β (0 ° < β < 90 °) by mask plate and underlay substrate and irradiate the photoresist not being exposed while exposing for the first time.
Then the photoresist unification after double exposure is once developed, and then exposes the first electrode 420.It is wide that the width that defines layer cross section for the pixel that makes to form is middle part, the trend that the width of top and the bottom reduces successively, makes the straight line at the incident direction place of exposure light for the first time and the straight line at the incident direction place of exposure light for the second time lay respectively at the relative both sides of normal at the first electrode 420 centers by exposing.Like this through double exposure, unexposed area photoresist cross section is class hexagon (be each pixel define the shape of layer similar be six prisms), accurately controls in theory light and can make pixel define layer for hexagon.
In the process of double exposure, by controlling light intensity, the energy of light is constantly increased, avoid the decay of the energy of light, make like this face of the inclination that forms on photoresist after exposure imaging more smooth, the surperficial angle of inclined-plane and the first electrode 420 is also respectively close to 90 °-α and 90 °-β.Further, make the straight line at the incident direction place of exposure light for the first time symmetrical along the normal at the first electrode 420 centers by exposing with the straight line at the incident direction place of exposure light for the second time, be the size of angle α and the equal and opposite in direction of angle β, the cross section that the convenient like this pixel of controlling final formation defines layer 430 is similar hexagonal structure.
Mode two (employing positive photoresist):
As shown in Figure 4 b, on the substrate after forming the first electrode 420, form one deck photoresist 430 ＇.The mode that forms photoresist 430 ＇ comprises the modes such as spin coating, slit, and the thickness of photoresist is 0.1um～100um, preferably 1～5um.
As shown in Fig. 4 e, make light pass through, after the light hole of mask plate 460, diffraction occurs, diffraction plate 470 can be set at light hole place and realize.The scattering at an angle of the light of diffraction, as shown in the head of arrow in Fig. 4 e and dotted line frame (dotted line frame shows the scope of illumination).With the light after diffraction, irradiate photoresist 430 ＇ corresponding to viewing area, to photoresist, 430 ＇ expose for the first time, and the cross section of the photoresist of unexposed area forms inverted trapezoidal.
As shown in Fig. 4 f, irradiation cross section is the region at photoresist upper base (what be positioned at top is upper base) two base angles of inverted trapezoidal, described photoresist is exposed for the second time, because the energy of light itself can be decayed, or its decay of manual control, or by the light hole at mask plate, lens are set and make illumination become Fig. 4 f in the trend of dotted line frame.It is wide that the width that finally defines layer cross section by the described pixel once develop forming is middle part, the trend that the width of top and the bottom reduces successively.
Can certainly be that the pixel of similar hexagon (can be hexagon in theory) defines layer 430 by time light being controlled in double exposure, finally being formed the cross section shown in Fig. 4 d.
Step S330, as shown in Fig. 4 g, defines on the first electrode 420 between layer 430 and forms organic luminous layer 440 in pixel.Organic luminous layer 440 generally includes one or more layers composition wherein such as hole injection layer, hole transmission layer, luminescent layer, hole blocking layer, electronic barrier layer, electron transfer layer, electron injecting layer, or the series connection white light structure of a plurality of above-mentioned organic luminous layers unit.Pixel defines layer 430 bottoms and the first electrode 420(anode) there is the angle that is less than 90 °, possessed capillary structure feature, during inkjet printing, during luminous organic material ink droplet, under the attraction of capillary structure, sprawl more even; Even if the irregular coffee toroidal effect of while marginal existence, the structure that also can be given prominence to by middle part in luminous is blocked, and effectively light-emitting zone brightness still can be more even, thereby effectively improved display quality.Preferably, make the thickness of organic luminous layer 440 be not less than the height that pixel defines layer 430 middle part the widest part, like this when follow-up making the second electrode (being generally negative electrode), do not need the very thick pit defining between layer with filler pixels that the second too many electrode material is done the second electrode just can avoid occurring the situation of the second electrode tomography, saved the second electrode material simultaneously, due to the second electrode, can do thinly, also increase transmitance.
Step S340 as shown in Fig. 4 h, at least forms the second electrode 450, thereby has finally formed OLED display device on described organic luminous layer 440.
In above-mentioned manufacture method, light in the time of can controlling exposure, or itself control and occur that it is the shape in Fig. 5 and Fig. 6 that error makes finally to form the cross sectional shape that pixel defines layer, in Fig. 5, pixel defines layer cross section 430 except upper and lower two limits, all the other limits are cambered outwards camber line, and in Fig. 6, pixel defines layer cross section 430 and is approximately oval, and it can also be the widest to being stairstepping transition two ends from centre that certain pixel defines layer.
The utility model also provides a kind of OLED display device, comprises that the first electrod-array, the pixel that are formed on underlay substrate define layer, organic luminous layer and the second electrode.Pixel defines layer between the first electrode, is followed successively by organic luminous layer and the second electrode on the first electrod-array, and it is wide that the width that described pixel defines layer cross section is middle part, the trend that the width of top and the bottom reduces successively.
Preferably, the thickness of described organic luminous layer is not less than the height that described pixel defines layer middle part the widest part.Middle part the widest part that described pixel defines layer divides the face that is clipped to top and the bottom to be plane, cambered surface or to be notch cuttype.Middle part the widest part that pixel defines layer divides and is clipped to the situation that the face of top and the bottom is plane, and as shown in Fig. 4 d, the sectional view that pixel defines layer can be approximate hexagon or hexagon; Middle part the widest part that pixel defines layer divides and is clipped to the situation that the face of top and the bottom is curved surface, and the sectional view that pixel defines layer can be figure shown in Fig. 5 or Fig. 6; Middle part the widest part that this exterior pixel defines layer divides the face that is clipped to top and the bottom also can become notch cuttype, as long as meet generally width that pixel defines layer cross section, to be middle part wide, the trend that the width of top and the bottom reduces successively.As shown in Fig. 4 h, only show structure more than flatness layer.Wherein, the thickness that pixel defines layer is 0.1um～100um, is preferably 1um～5um.The material that pixel defines layer can be resin, polyimides, organosilicon or SiO
2deng.
Conventionally on underlay substrate, be formed with the flatness layer of thin-film transistor (TFT) array of structures and top thereof, the first electrod-array is formed on flatness layer top, and by via hole, connects the drain electrode of the drive TFT in thin-film transistor structure.
The pixel of OLED display device of the present utility model define layer cross section width be middle part wide, the trend that the width of top and the bottom reduces successively.Be that pixel defines layer bottom and the first electrode (anode) has the angle that is less than 90 °, possessed capillary structure, during inkjet printing, during luminous organic material ink droplet, under the attraction of capillary structure, sprawl more even; Even if the irregular coffee toroidal effect of while marginal existence, the structure that also can be given prominence to by middle part in luminous is blocked, and effectively light-emitting zone brightness still can be more even, thereby effectively improved display quality; On the other hand, it is narrower that pixel defines layer top, forms certain toe, can make the thickness of organic luminous layer just arrive pixel and define a layer middle part the widest part, avoided inverted trapezoidal structure to have the defect of the second electrode (negative electrode) tomography during evaporation negative electrode like this; And negative electrode can do thinly, increase transmitance, reduce cathode material cost.
The utility model also provides a kind of display unit, comprises above-mentioned OLED display device.This display unit can be: Electronic Paper, OLED display, DPF, mobile phone, panel computer etc. have product or the parts of any Presentation Function.
Above execution mode is only for illustrating the utility model; and be not limitation of the utility model; the those of ordinary skill in relevant technologies field; in the situation that not departing from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.
Claims (8)
1. an OLED display device, comprise that the first electrod-array, pixel define layer, organic luminous layer and the second electrode, pixel defines layer between the first electrode, on the first electrod-array, be followed successively by organic luminous layer and the second electrode, it is characterized in that, it is wide that the width that described pixel defines layer cross section is middle part, the trend that the width of top and the bottom reduces successively.
2. OLED display device as claimed in claim 1, is characterized in that, the thickness of described organic luminous layer is not less than the height that described pixel defines layer middle part the widest part.
3. OLED display device as claimed in claim 1, is characterized in that, the thickness that described pixel defines layer is 0.1um～100um.
4. OLED display device as claimed in claim 3, is characterized in that, the thickness that described pixel defines layer is 1um～5um.
5. OLED display device as claimed in claim 1, is characterized in that, the material that described pixel defines layer comprises: resin, polyimides, organosilicon or SiO
2.
6. the OLED display device as described in as arbitrary in claim 1～5, is characterized in that, middle part the widest part that described pixel defines layer divides the face that is clipped to top and the bottom to be plane, cambered surface or to be notch cuttype.
7. the OLED display device as described in as arbitrary in claim 1～5, is characterized in that, the cross section that described pixel defines layer is hexagon or ellipse.
8. a display unit, is characterized in that, comprises the OLED display device as described in any one in claim 1～7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420155336.0U CN203787433U (en) | 2014-04-01 | 2014-04-01 | OLED display member and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420155336.0U CN203787433U (en) | 2014-04-01 | 2014-04-01 | OLED display member and display device |
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| Publication Number | Publication Date |
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| CN203787433U true CN203787433U (en) | 2014-08-20 |
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| CN201420155336.0U Expired - Lifetime CN203787433U (en) | 2014-04-01 | 2014-04-01 | OLED display member and display device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928497A (en) * | 2014-04-01 | 2014-07-16 | 京东方科技集团股份有限公司 | OLED displayer, manufacturing method of OLED displayer and display device |
| CN107340683A (en) * | 2017-07-28 | 2017-11-10 | 京东方科技集团股份有限公司 | Mask plate, oled display substrate and preparation method thereof, display device |
| CN108305891A (en) * | 2018-02-12 | 2018-07-20 | 上海天马微电子有限公司 | Display panel, manufacturing method thereof and display device |
| EP3229285A4 (en) * | 2014-12-04 | 2018-08-01 | Boe Technology Group Co. Ltd. | Pixel definition layer and manufacturing method therefor, display panel and display device |
| WO2018233207A1 (en) * | 2017-06-23 | 2018-12-27 | Boe Technology Group Co., Ltd. | Display substrate, display apparatus, method of fabricating display substrate |
| WO2019120113A1 (en) * | 2017-12-18 | 2019-06-27 | 京东方科技集团股份有限公司 | Preparation method for display substrate, and flattening device |
| CN113782690A (en) * | 2021-08-30 | 2021-12-10 | 合肥维信诺科技有限公司 | Light emitting device and display panel |
-
2014
- 2014-04-01 CN CN201420155336.0U patent/CN203787433U/en not_active Expired - Lifetime
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|---|---|---|---|---|
| WO2015149467A1 (en) * | 2014-04-01 | 2015-10-08 | 京东方科技集团股份有限公司 | Oled display device and manufacturing method therefor, and display apparatus |
| CN103928497B (en) * | 2014-04-01 | 2016-07-13 | 京东方科技集团股份有限公司 | OLED display device and preparation method thereof, display device |
| CN103928497A (en) * | 2014-04-01 | 2014-07-16 | 京东方科技集团股份有限公司 | OLED displayer, manufacturing method of OLED displayer and display device |
| US10115775B2 (en) | 2014-04-01 | 2018-10-30 | Boe Technology Group Co., Ltd. | OLED display device and manufacturing method thereof, and display apparatus |
| EP3229285A4 (en) * | 2014-12-04 | 2018-08-01 | Boe Technology Group Co. Ltd. | Pixel definition layer and manufacturing method therefor, display panel and display device |
| WO2018233207A1 (en) * | 2017-06-23 | 2018-12-27 | Boe Technology Group Co., Ltd. | Display substrate, display apparatus, method of fabricating display substrate |
| US11088226B2 (en) | 2017-06-23 | 2021-08-10 | Boe Technology Group Co., Ltd. | Display substrate, display apparatus, method of fabricating display substrate |
| CN107340683A (en) * | 2017-07-28 | 2017-11-10 | 京东方科技集团股份有限公司 | Mask plate, oled display substrate and preparation method thereof, display device |
| CN107340683B (en) * | 2017-07-28 | 2020-12-01 | 京东方科技集团股份有限公司 | Mask plate, OLED display substrate, manufacturing method of OLED display substrate and display device |
| WO2019120113A1 (en) * | 2017-12-18 | 2019-06-27 | 京东方科技集团股份有限公司 | Preparation method for display substrate, and flattening device |
| US11569486B2 (en) | 2017-12-18 | 2023-01-31 | Boe Technology Group Co., Ltd. | Manufacturing method for display substrate and flattening device |
| CN108305891A (en) * | 2018-02-12 | 2018-07-20 | 上海天马微电子有限公司 | Display panel, manufacturing method thereof and display device |
| CN113782690A (en) * | 2021-08-30 | 2021-12-10 | 合肥维信诺科技有限公司 | Light emitting device and display panel |
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