CN104064686B - Organic light-emitting display device - Google Patents
Organic light-emitting display device Download PDFInfo
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- CN104064686B CN104064686B CN201410268418.0A CN201410268418A CN104064686B CN 104064686 B CN104064686 B CN 104064686B CN 201410268418 A CN201410268418 A CN 201410268418A CN 104064686 B CN104064686 B CN 104064686B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
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Abstract
The invention provides an organic light-emitting display device. The organic light-emitting display device comprises a first substrate, a second substrate, a plurality of organic light-emitting elements and a conductive layer. The first substrate and the second substrate are arranged oppositely. The organic light-emitting elements are arranged on the side, facing the second substrate, of the first substrate. Each organic light-emitting element comprises an anode arranged on the first substrate, an organic light-emitting layer arranged on the anode and a cathode arranged on the organic light-emitting layer. The conductive layer is arranged on the side, facing the first substrate, of the second substrate. The conductive layer makes contact with the cathodes. Due to the fact that the conductive layer makes contact with the cathodes, sheet resistance of cathode layers can be reduced, and voltage drop, on the cathode layers, of driving signals can be reduced. Thus, the difference of values of currents flowing through all the organic light-emitting elements is reduced, light emitted by the organic light-emitting elements are more similar in intensity, and the display brightness of the whole organic light-emitting device tends to be uniform.
Description
Technical field
The present invention relates to organic light emitting display field, more particularly, it is related to a kind of top emitting of being more uniformly distributed of display
The organic light-emitting display device of structure.
Background technology
OLED (oled, organic light emitting display) is that one kind is partly led using organic
Thin film light emitting device that body material is made, using direct voltage drive, has self luminous characteristic.
The organic light-emitting display device with spontaneous light characteristic includes organic illuminating element, and described organic illuminating element includes
Organic luminous layer, anode and negative electrode.Organic light-emitting display device is divided into top to send out according to the difference of organic illuminating element light direction
Penetrate structure and bottom emitting structure.The light that organic illuminating element in the organic light-emitting display device of emission structure at top sends is from negative electrode
Direction is launched, and therefore negative electrode needs to adopt transparent conductive material, and such as tin indium oxide (ito) or indium zinc oxide (izo) etc. are transparent
Conductive material.The negative electrode of multiple organic illuminating elements links together, and forms the cathode layer in a whole face, each organic illuminating element
Negative electrode all the negative electrode via outside viewing area is connected to by the cathode layer in this whole face, with from outside obtain negative electrode drive
Signal, however, because transparent conductive material has higher surface resistance, negative electrode drive signal can produce voltage on cathode layer
Fall, and viewing area diverse location organic illuminating element negative electrode with a distance from negative electrode via different, therefore diverse location
The negative electrode drive signal of organic illuminating element the different losses of voltage are had on cathode layer, and the driving electricity inputting when showing
Pressure is identical, leads to the voltage drop on each organic illuminating element to produce difference, thus size of current produces difference, causes display
The inconsistent problem of region display brightness.And, the inconsistent situation of this display brightness can with the thinning of cathode layer more
Plus substantially, but the transmitance of blocked up cathode layer is poor, is unfavorable for that organic illuminating element goes out light.Therefore, organic in order to realize
The homogenization that luminous display unit shows, ensures light emission rate simultaneously, needs to study the structure of new organic light-emitting display device.
Content of the invention
In view of this, the present invention provides a kind of organic light-emitting display device, and this organic light-emitting display device can reduce respectively
Difference between the resistance sizes of individual organic illuminating element negative electrode, realizes the homogenization of each organic illuminating element display brightness.
The present invention provides a kind of organic light-emitting display device, and described organic light-emitting display device includes: the being oppositely arranged
One substrate and second substrate；It is arranged on described first substrate towards multiple organic illuminating elements of described second substrate side, institute
State each organic illuminating element and include the anode being arranged on described first substrate, the organic light emission being arranged on described anode
Layer, the negative electrode being arranged on described organic luminous layer；It is arranged on described second substrate towards the conduction of described first substrate side
Layer, described conductive layer and described cathode electrical contact.
The negative electrode of the plurality of organic illuminating element interconnects and forms a cathode layer, described organic light emitting display
Device also includes being arranged at the negative electrode via of described first substrate periphery, and described cathode layer is obtained from outside by described negative electrode via
Obtain negative electrode drive signal.
Preferably, described conductive layer can make thickness according to the difference of the distance between organic illuminating element and negative electrode via
Or the change in distribution density, in inhomogenous arrangement.
Conductive layer and cathode electrical contact, can reduce the surface resistance of cathode layer, reduce electricity on cathode layer for the drive signal
Pressure drop, thus reduce the gap of the current value flowing through each organic illuminating element so that the light intensity that sends of organic illuminating element
It is more nearly so that whole organic light emitting apparatus display brightness reaches unanimity.
Brief description
The cover plate schematic top plan view of the organic light-emitting display device that Fig. 1 provides for the embodiment of the present invention one；
The cover plate schematic cross-section of the organic light-emitting display device that Fig. 2 provides for the embodiment of the present invention one；
The schematic top plan view of the array base palte of the organic light-emitting display device that Fig. 3 provides for the embodiment of the present invention one；
The schematic cross-section of the array base palte of the organic light-emitting display device that Fig. 4 provides for the embodiment of the present invention one；
The schematic cross-section of the organic light-emitting display device that Fig. 5 provides for the embodiment of the present invention one；
The schematic equivalent circuit of the organic light-emitting display device that Fig. 6 provides for the embodiment of the present invention one；
The cover plate schematic top plan view of the organic light-emitting display device that Fig. 7 provides for the embodiment of the present invention two；
The cover plate schematic cross-section of the organic light-emitting display device that Fig. 8 provides for the embodiment of the present invention two；
The organic light-emitting display device cover plate schematic top plan view that Fig. 9 provides for the embodiment of the present invention three；
Another kind of organic light-emitting display device cover plate schematic top plan view that Figure 10 provides for the embodiment of the present invention three.
Specific embodiment
In order to know more about the technology contents of the present invention, illustrate as follows especially exemplified by specific embodiment and appended by coordinating, but,
The following drawings and description are substantially illustrative and nonrestrictive, any those of ordinary skill in the art,
Without departing from the spirit and scope of the present invention, when making a little change and retouching, therefore protection scope of the present invention is when regarding power
Sharp claim defined person be defined.
Embodiment one
Refer to Fig. 1, the vertical view of the cover plate of the organic light-emitting display device that Fig. 1 provides for the embodiment of the present invention one is illustrated
Figure, Fig. 2 is the sectional view along aa ' direction for the cover plate in Fig. 1, and cover plate includes second substrate 200 and conductive layer 210, conductive layer 210
It is arranged on the side towards first substrate for the second substrate 200.
The schematic top plan view of the array base palte of the organic light-emitting display device that Fig. 3 provides for the embodiment of the present invention one, described
Array base palte and cover plate are oppositely arranged, and array base palte includes first substrate 100, multiple organic illuminating element 130 and negative electrode via
150, the plurality of organic illuminating element 130 and negative electrode via 150 are arranged on first substrate 100 towards the one of second substrate 200
Side.Array base palte has viewing area 180, and the plurality of organic illuminating element 130 is arranged in the matrix form in viewing area 180
Row, negative electrode via 150 is arranged on the periphery of viewing area 180, can be arranged on the periphery of viewing area 180 any one or
The multiple region of person, shows a case that in Fig. 3 to be all around respectively provided with negative electrode via 150 in viewing area 180.
Fig. 4 is the sectional view of the viewing area 180 of array base palte.Organic illuminating element 130 includes being successively set on first
Anode 132 on substrate 100, organic luminous layer 134 and negative electrode 136, described organic luminous layer 134 is arranged on anode 132 He
Between negative electrode 136.The viewing area 180 of array base palte also includes pixel defining layer 120, and pixel defining layer 120 defines display
The pixel region in region 180, specifically, the region between adjacent pixel defining layer 120 is pixel region.Each organic light emission
The anode 132 of element 130 and organic luminous layer 134 are separately positioned in each pixel region, each organic illuminating element 130
Negative electrode 136 interconnects, and forms the cathode layer in a whole face above pixel defining layer 120, and described cathode layer also prolongs
The periphery reaching viewing area 180 forms negative electrode via 150.Each organic illuminating element 130 is by the negative electrode in described one whole face
Layer obtains negative electrode drive signal by negative electrode via 150 from outside.Due to not needing individually to each organic illuminating element
The setting of 130 incoming lines realizing negative electrode drive signal, therefore has the organic light emitting display of the cathode layer structure in a whole face
Device is more prone to manufacture.
The viewing area 180 of array base palte also includes multiple thin film transistor (TFT)s 110, and each thin film transistor (TFT) 110 described is right
It is connected to the anode 132 of an organic illuminating element 130 with answering.Thin film transistor (TFT) 110 includes semiconductor layer 111, gate electrode 112
With source/drain electrode 113.Semiconductor layer 111 includes source region and drain region and channel region.Gate electrode 112 passes through grid
Pole insulating barrier 114 is insulated with semiconductor layer 111.Additionally, source/drain electrode 113 is by being formed at insulating barrier 115 and gate insulator
Contact hole in 114 is connected respectively to source region and the drain region of semiconductor layer 111.Passivation layer 116 is located at source/drain electrode
On 113.
With reference to Fig. 5, the section of the viewing area 180 of the organic light-emitting display device that Fig. 5 provides for the embodiment of the present invention one
Figure, first substrate 100 is oppositely arranged with second substrate 200.Negative electrode 136 on first substrate 100 and second substrate 200 inner side
Conductive layer 210 makes electrical contact with.Fig. 1 shows that conductive layer 210 is netted embodiment, and reticulated conductive layer 210 is in vertical substrate direction
On projection fall in pixel defining layer 120, the therefore cathode layer electrical contact of conductive layer 210 and pixel defining layer 120 top, by
Generally adopt organic material in pixel defining layer 120, there is certain elasticity it is ensured that between conductive layer 210 and negative electrode 136
Keep good electrical contact.And above pixel region be reticulated conductive layer 210 mesh area, therefore, conductive layer 210 will not
Block the light that organic illuminating element 130 sends it is ensured that the transmitance of organic light-emitting display device.Except network structure, lead
Electric layer 210 can also be multiple strips, or multiple lamellar, and projection on vertical substrate direction for the same conductive layer 210 falls
In pixel defining layer 120.
Conductive layer 210 can be formed by transparent conductive material, for example, formed by ito or izo etc., or by metal material shape
Become, for example, formed by al, mo, cr, pt, w, cu, ag, au etc..
With reference to Fig. 6, the schematic equivalent circuit of the organic light-emitting display device that Fig. 6 provides for the embodiment of the present invention one.As
Shown in figure, multiple organic illuminating elements in parallel between anode signal input pvdd and cathode signal input pvee
Oled, each organic illuminating element is connected with thin film transistor (TFT), in order to input data signal data, the sun of organic illuminating element
Pole signal is inputted by anode signal input pvdd end, and cathode signal is inputted by cathode signal input pvee end, cathode signal
After being inputted by negative electrode via, each organic illuminating element is reached by cathode layer, because how cathode layer is by transparent conductive material shape
Become, and cathode layer is relatively thin, the surface resistance of therefore cathode layer is larger, each organic illuminating element corresponding for cathode layer can be divided into
Multiple resistance r1.When arranging conductive layer on organic light-emitting display device cover plate, conductive layer and cathode electrical contact, by conductive layer
Each organic illuminating element corresponding is divided into multiple resistance r2, is simultaneously between each organic illuminating element corresponding resistance r1 and r2
Connection relation.Be chained together after the r1 of each organic illuminating element is in parallel with r2, cathode signal be transmitted through a series of series connection
Resistance after reach each organic illuminating element, r0 be negative electrode via at cathode layer resistance.
Flow through first pixel cell electric current be i1, flow through second pixel unit electric current be i2, flow through the 3rd
The electric current of pixel cell be i3 ... flow through nth pixel unit electric current be in, because of anode signal input pvdd and negative electrode
Voltage constant between signal input part pvee, and pass through each resistance and can produce certain voltage drop, so electric current i1,
I2, i3 ... the value of in is gradually reduced.It is incorporated to so that resistance corresponding to each organic illuminating element due to resistance r2
Total value reduce, thus also reducing in ohmically voltage drop, therefore, electric current i1, i2, i3 ... the value of in compared with r2 be incorporated to before all
Lifted, and electric current i1, i2, i3 ... difference between the value of in reduces, thus leading to organic illuminating element oled to send
Light intensity difference also reduce.Therefore that is to say, that conductive layer has compensating action to the light intensity of organic illuminating element, macroscopically
See more uniform as display brightness.
Embodiment two
With reference to Fig. 7 and Fig. 8, the cover plate schematic top plan view of the organic light-emitting display device that Fig. 7 provides for embodiment two, Fig. 8
For Fig. 7 cover plate along bb ' direction sectional view.The organic light-emitting display device that embodiment two provides is on the basis of embodiment one
On, the thickness of the conductive layer 310 of corresponding viewing area diverse location is different, and thickness changing trend is had with the position of negative electrode via
Close.
Negative electrode via is shown a case that in viewing area all around in Fig. 7 and Fig. 8, in Fig. 7, region shown in region 350
For negative electrode via corresponding region, specifically, when array base palte and cover plate are oppositely arranged, negative electrode via corresponding region 350 is corresponding
Negative electrode via area in array base palte, is negative electrode via area view field on the cover board.
Show the thickness change rule of conductive layer 310 in Fig. 8, correspond to for negative electrode via in the peripheral regions of substrate 300
Region 350, the negative electrode via area on corresponding array base palte.Described conductive layer 310, close to negative electrode via corresponding region 350
The thickness at place is less than away from the thickness at negative electrode via corresponding region 350.Conductive layer 310 is apart from negative electrode via corresponding region 350
More nearby, then thickness is thinner.After cover plate and array base palte bond, it is also believed to described conductive layer 310, close to negative electrode mistake
Thickness at bore region is less than away from the thickness at negative electrode via area.
Although the conductive layer 310 of diverse location has different thickness, because the pixel defining layer on array base palte has
Certain elasticity is it is ensured that conductive layer 310 has effective electrical contact with the negative electrode on array base palte, but due to display dress
Put the thick restriction of box, conductive layer 310 is unsuitable blocked up, and the maximum of the therefore thickness of conductive layer 310 is preferably the 2～3 of minima
Times.It is of course also possible to setting has certain thickness insulator spacer, such as organic membrane between substrate 300 and conductive layer 310
Deng to make up the thickness difference between the conductive layer 310 of diverse location it is ensured that conductive layer 310 is had with the negative electrode on array base palte
Preferably make electrical contact with.
When negative electrode via is arranged on both sides or side or one jiao of viewing area, the thickness change of conductive layer 310
Equally follow following rule: apart from the position of negative electrode via more nearby, the thickness of conductive layer 310 is thinner, conductive layer for conductive layer 310
310 get at a distance apart from the position of negative electrode via, and its thickness is thicker.
Alternatively, described conductive layer can be netted, or multiple strip, or multiple lamellar.
Because organic illuminating element is more remote apart from negative electrode via, the cathode layer series electrical that negative electrode drive signal flows through when inputting
Resistance is more, and therefore organic illuminating element is more remote with the distance of negative electrode via, and the voltage of its received negative electrode drive signal damages
Lose also more, the light intensity that it sends is also weaker.In the present embodiment, get at a distance apart from negative electrode via in conductive layer 310, it is thick that it is set
Degree is thicker, and less resistance is incorporated in the corresponding resistance of organic illuminating element farther out apart from negative electrode via, can be by electricity
Resistance reduces to a greater degree, thus reducing light-intensity difference and other organic illuminating element between further that is to say, that more
The compensating action of the light intensity to organic illuminating element for the little resistance is bigger, and the inhomogenous situation of display can be made preferably to be changed
Kind.
Embodiment three
With reference to Fig. 9, the schematic top plan view of the cover plate of the organic light-emitting display device that Fig. 9 provides for the embodiment of the present invention three.
The consistency of thickness of its conductive layer 410 of organic light-emitting display device that embodiment three provides, but viewing area diverse location is led
The density of setting of electric layer 410 is made to change, on cover plate conductive layer 410 in the distribution density heterogeneity of viewing area, variation tendency with
The position of negative electrode via is relevant.
Negative electrode via is shown a case that in viewing area all around, in Fig. 9, region 450 corresponds to for negative electrode via in Fig. 9
Region, specifically, when array base palte and cover plate are oppositely arranged, the negative electrode of the corresponding array base palte in negative electrode via corresponding region 450
Via area, is negative electrode via area view field on the cover board.Conductive layer 410 has hollow-out parts 411 and non-hollow-out parts
412, the region outside organic illuminating element on the corresponding array base palte of non-hollow-out parts 412, correspondence mentioned here refers to, works as array
When substrate and cover plate are oppositely arranged, on the direction of vertical substrate, projection on array base palte for the non-hollow-out parts 412 falls organic
Region outside light-emitting component, so can avoid conductive layer 410 to block the light that organic illuminating element sends, to improve light in lid
Transmitance on plate.
In the present embodiment, the density of the non-hollow-out parts 412 of the conductive layer 410 at negative electrode via corresponding region 450
Density less than the non-hollow-out parts 412 away from the conductive layer 410 at negative electrode via corresponding region 450.When cover plate and array base palte
After bonding, be also believed to described conductive layer 410, non-hollow-out parts 412 density at negative electrode via area be less than away from
The density of the non-hollow-out parts 412 at negative electrode via area.
When negative electrode via is arranged on both sides or side or one jiao of viewing area, the non-hollow-out parts of conductive layer 410
412 variable density equally follows following rule: conductive layer 410 apart from the position of negative electrode via area more nearby, conductive layer 410
Non- hollow-out parts 412 density less, conductive layer 410 is got at a distance apart from the position of negative electrode via area, and the non-of conductive layer 410 is engraved
The density in empty portion 412 is bigger.
Figure 10 is the cover plate schematic top plan view of the embodiment of the present invention three another embodiment, shows that conductive layer 410 is
The situation of multiple horizontal strips, the distribution density of the non-hollow-out parts 412 of the mid portion of viewing area is larger, the leading of horizontal strip
Electric layer 410 reduces to both sides arrangement density from centre, and that is, the distribution density of non-hollow-out parts 412 is gradually reduced.
Alternatively, conductive layer can also be multiple longitudinal strips, or is multiple lamellars.
Because organic illuminating element is more remote apart from negative electrode via, the cathode layer series electrical that negative electrode drive signal flows through when inputting
Resistance is more, and therefore organic illuminating element is more remote with the distance of negative electrode via, and the voltage of its received negative electrode drive signal damages
Lose also more, the light intensity that it sends is also weaker.In the present embodiment, setting conductive layer is nearer apart from the position of negative electrode via area
Place, the density of the non-hollow-out parts of conductive layer is less, and conductive layer is got at a distance apart from the position of negative electrode via area, and the non-of conductive layer is engraved
The density in empty portion is bigger, and less resistance is incorporated in the corresponding resistance of organic illuminating element farther out apart from negative electrode via,
Resistance value can be reduced to a greater degree, thus reducing the light-intensity difference and other organic illuminating element between further,
That is, the compensating action of the less resistance light intensity to organic illuminating element is bigger, and the inhomogenous situation of display can be made to obtain
Improve to more preferable.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention
God and scope.So, if these modifications and modification belong within the scope of the claims in the present invention and its equivalent technologies, then originally
Invention is also intended to comprise these changes and modification.
Claims (5)
1. a kind of organic light-emitting display device, described organic light-emitting display device includes:
The first substrate being oppositely arranged and second substrate；
It is arranged on described first substrate towards multiple organic illuminating elements of described second substrate side, each organic illuminating element
The organic luminous layer that including the anode being arranged on described first substrate, is arranged on described anode, it is arranged on described organic
Negative electrode on photosphere；
It is arranged on described second substrate towards the conductive layer of described first substrate side, described conductive layer is connect with described negative electrode electricity
Touch；
Wherein, the negative electrode of the plurality of organic illuminating element interconnects and forms a cathode layer；
Described organic light-emitting display device also includes being arranged at the negative electrode via of described first substrate periphery, and described cathode layer passes through
Described negative electrode via obtains negative electrode drive signal from outside；
It is less than the moon at away from described negative electrode via in the thickness of the conductive layer above the cathode layer at described negative electrode via
The thickness of the conductive layer above the layer of pole.
2. organic light-emitting display device as claimed in claim 1 it is characterised in that: in the negative electrode at described negative electrode via
To the direction away from the cathode layer at described negative electrode via, the thickness of the conductive layer on described cathode layer is gradually increased layer.
3. organic light-emitting display device as claimed in claim 1 it is characterised in that: the maximum of the thickness of described conductive layer is
2～3 times of minima.
4. organic light-emitting display device as claimed in claim 1 it is characterised in that: described organic light-emitting display device also includes
It is arranged on the separator on second substrate, between conductive layer and second substrate, described separator corresponds to first to described separator
Region outside organic illuminating element on substrate.
5. organic light-emitting display device as claimed in claim 1 it is characterised in that: described conductive layer adopts transparent conductive material
Or metal material is formed.
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| CN104465709B (en) | 2014-12-26 | 2017-06-23 | 京东方科技集团股份有限公司 | OLED array and preparation method thereof, encapsulating structure, display device |
| KR102467420B1 (en) * | 2015-08-31 | 2022-11-16 | 삼성디스플레이 주식회사 | Display apparatus and method of manufacturing the same |
| KR102409060B1 (en) * | 2015-09-11 | 2022-06-16 | 삼성디스플레이 주식회사 | Display device |
| CN105957876B (en) * | 2016-06-02 | 2018-07-17 | 京东方科技集团股份有限公司 | A kind of substrate, its driving method, display panel and display device |
| CN107359274A (en) * | 2017-06-27 | 2017-11-17 | 上海天马有机发光显示技术有限公司 | The preparation method of display panel, display device and display panel |
| CN109728029B (en) * | 2017-10-31 | 2021-03-30 | 云谷（固安）科技有限公司 | Display panel and terminal |
| CN108520889A (en) * | 2018-04-10 | 2018-09-11 | 上海天马有机发光显示技术有限公司 | Organic light emitting display panel and its display device |
| CN110880523A (en) * | 2018-09-05 | 2020-03-13 | 上海和辉光电有限公司 | Display panel, display device and preparation method of display panel |
| CN109686863A (en) * | 2019-01-18 | 2019-04-26 | 深圳市华星光电半导体显示技术有限公司 | OLED display panel |
| CN110323258A (en) * | 2019-05-09 | 2019-10-11 | 京东方科技集团股份有限公司 | Display base plate and display device |
| CN110310976B (en) | 2019-07-12 | 2022-01-18 | 京东方科技集团股份有限公司 | Display substrate and display device |
| CN110504384B (en) * | 2019-08-29 | 2022-04-12 | 京东方科技集团股份有限公司 | Organic electroluminescent device and display panel |
| CN117322165A (en) * | 2022-04-29 | 2023-12-29 | 京东方科技集团股份有限公司 | Display substrate and display device |
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Effective date of registration: 20211028 Address after: No.8, liufangyuan Henglu, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN TIANMA MICRO-ELECTRONICS Co.,Ltd. Patentee after: Wuhan Tianma Microelectronics Co.,Ltd. Shanghai Branch Patentee after: Tianma Micro-Electronics Co.,Ltd. Address before: 201201, 889, Qing Qing Road, Shanghai, Pudong New Area Patentee before: SHANGHAI TIANMA AM-OLED Co.,Ltd. Patentee before: Tianma Micro-Electronics Co.,Ltd. |