CN104064686A - Organic light-emitting display device - Google Patents
Organic light-emitting display device Download PDFInfo
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- CN104064686A CN104064686A CN201410268418.0A CN201410268418A CN104064686A CN 104064686 A CN104064686 A CN 104064686A CN 201410268418 A CN201410268418 A CN 201410268418A CN 104064686 A CN104064686 A CN 104064686A
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- organic light
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- emitting display
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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
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, relate to the more organic light-emitting display device of the emission structure at top of homogenizing of a kind of demonstration.
Background technology
Organic light emitting display (OLED, Organic Light Emitting Display) is a kind of that organic semiconducting materials is made, to use direct voltage drive thin-film light emitting device that utilizes, and has self luminous characteristic.
The organic light-emitting display device with self-luminous characteristic comprises organic illuminating element, and described organic illuminating element comprises organic luminous layer, anode and negative electrode.Organic light-emitting display device is divided into emission structure at top and end emitting structural according to the difference of organic illuminating element light direction.The light that organic illuminating element in the organic light-emitting display device of emission structure at top sends is launched from cathode direction, so negative electrode need to adopt transparent conductive material, transparent conductive materials such as tin indium oxide (ITO) or indium zinc oxide (IZO).The negative electrode of a plurality of organic illuminating elements links together, form the cathode layer of whole, the negative electrode of each organic illuminating element is connected to the negative electrode via hole in outside, viewing area by this cathode layer of whole, to obtain negative electrode from outside, drive signal, yet, because transparent conductive material has higher surface resistance, negative electrode drives signal can on cathode layer, produce voltage drop, and it is different from the distance of negative electrode via hole at the negative electrode of the organic illuminating element of viewing area diverse location, therefore the negative electrode of the organic illuminating element of diverse location drives signal on cathode layer, to have the different losses of voltage, and the driving voltage of input is identical while showing, cause the voltage drop on each organic illuminating element to produce difference, thereby size of current produces difference, cause the inconsistent problem of viewing area display brightness.And the inconsistent situation of this display brightness can be more obvious along with the attenuate of cathode layer, but the transmitance of blocked up cathode layer is poor, is unfavorable for organic illuminating element bright dipping.Therefore, the homogenizing showing in order to realize organic light-emitting display device guarantees light emission rate simultaneously, need to study the structure of new organic light-emitting display device.
Summary of the invention
In view of this, the invention provides a kind of organic light-emitting display device, this organic light-emitting display device can reduce the difference between the resistance sizes of each organic illuminating element negative electrode, realizes the homogenization of each organic illuminating element display brightness.
The invention provides a kind of organic light-emitting display device, described organic light-emitting display device comprises: the first substrate being oppositely arranged and second substrate; Be arranged on described first substrate towards a plurality of organic illuminating elements of described second substrate one side, described each organic illuminating element comprises the anode that is arranged on described first substrate, be arranged on organic luminous layer on described anode, be arranged on the negative electrode on described organic luminous layer; Be arranged on described second substrate towards the conductive layer of described first substrate one side, described conductive layer contacts with described cathodic electricity.
The negative electrode of described a plurality of organic illuminating elements interconnects and forms a cathode layer, described organic light-emitting display device also comprises the negative electrode via hole that is arranged at described first substrate periphery, and described cathode layer obtains negative electrode and drives signal from outside by described negative electrode via hole.
Preferably, described conductive layer can be done the variation in thickness or distribution density according to the difference of the distance between organic illuminating element and negative electrode via hole, is inhomogenous and arranges.
Conductive layer contacts with cathodic electricity, can reduce the surface resistance of cathode layer, reduce to drive the voltage drop of signal on cathode layer, thereby the gap of the current value of each organic illuminating element that reduces to flow through, the luminous intensity that organic illuminating element is sent is more approaching, and whole organic light emitting apparatus display brightness is reached unanimity.
Accompanying drawing explanation
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;
The 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.
Embodiment
In order more to understand technology contents of the present invention; especially exemplified by specific embodiment and coordinate appended illustrate as follows; but; the following drawings and description are in fact illustrative and nonrestrictive; under any, in technical field, have and conventionally know the knowledgeable; without departing from the spirit and scope of the present invention, when doing a little change and retouching, so protection scope of the present invention is when being as the criterion depending on claims person of defining.
Embodiment mono-
Please refer to Fig. 1, the schematic top plan view of the cover plate of the organic light-emitting display device that Fig. 1 provides for the embodiment of the present invention one, Fig. 2 is that cover plate in Fig. 1 is along the sectional view of AA ' direction, cover plate comprises second substrate 200 and conductive layer 210, and conductive layer 210 is arranged on second substrate 200 towards a side of first substrate.
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, array base palte comprises first substrate 100, a plurality of organic illuminating element 130 and negative electrode via hole 150, and described a plurality of organic illuminating elements 130 and negative electrode via hole 150 are arranged on first substrate 100 towards a side of second substrate 200.Array base palte has viewing area 180, described a plurality of organic illuminating element 130 180 is arranged with matrix form in viewing area, negative electrode via hole 150 is arranged on the periphery of viewing area 180, can be arranged on peripheral any one or a plurality of region of viewing area 180,180 the situation of negative electrode via hole 150 that all around all arranges has been shown in Fig. 3 in viewing area.
Fig. 4 is the sectional view of the viewing area 180 of array base palte.Organic illuminating element 130 comprises anode 132, organic luminous layer 134 and the negative electrode 136 being successively set on first substrate 100, and described organic luminous layer 134 is arranged between anode 132 and negative electrode 136.The viewing area 180 of array base palte also comprises pixel defining layer 120, and pixel defining layer 120 defines the pixel region of viewing area 180, concrete, and the region between adjacent pixel defining layer 120 is pixel region.The anode 132 of each organic illuminating element 130 and organic luminous layer 134 are separately positioned in each pixel region, the negative electrode 136 of each organic illuminating element 130 interconnects, above pixel defining layer 120, form the cathode layer of whole, the periphery that described cathode layer also extends to viewing area 180 forms negative electrode via hole 150.Each organic illuminating element 130 obtains negative electrode driving signal by the cathode layer of described whole from outside by negative electrode via hole 150.Owing to not needing individually each organic illuminating element 130 to be realized to the setting that negative electrode drives the incoming line of signal, the organic light-emitting display device therefore with the cathode layer structure of whole is more prone to manufacture.
The viewing area 180 of array base palte also comprises a plurality of thin-film transistors 110, and described each thin-film transistor 110 is connected to the anode 132 of an organic illuminating element 130 accordingly.Thin-film transistor 110 comprises semiconductor layer 111, gate electrode 112 and source/drain electrode 113.Semiconductor layer 111 comprises source region and drain region and channel region.Gate electrode 112 is by gate insulator 114 and semiconductor layer 111 insulation.In addition, source/drain electrode 113 is connected respectively to source region and the drain region of semiconductor layer 111 by being formed on contact hole in insulating barrier 115 and gate insulator 114.Passivation layer 116 is positioned on source/drain electrode 113.
With reference to figure 5, the sectional view of the viewing area 180 of the organic light-emitting display device that Fig. 5 provides for the embodiment of the present invention one, first substrate 100 is oppositely arranged with second substrate 200.Negative electrode 136 on first substrate 100 electrically contacts with the conductive layer 210 of second substrate 200 inner sides.Fig. 1 shows conductive layer 210 for netted embodiment, the projection of netted conductive layer 210 in vertical substrate direction drops in pixel defining layer 120, therefore conductive layer 210 electrically contacts with the cathode layer of pixel defining layer 120 tops, because pixel defining layer 120 adopts organic material conventionally, there is certain elasticity, can guarantee to keep good electrically contacting between conductive layer 210 and negative electrode 136.And above pixel region, be the mesh region of netted conductive layer 210, therefore, conductive layer 210 can not block the light that organic illuminating element 130 sends, and can guarantee the transmitance of organic light-emitting display device.Except network structure, conductive layer 210 can be also a plurality of strips, or a plurality of sheet, and the projection of same conductive layer 210 in vertical substrate direction drops in pixel defining layer 120.
Conductive layer 210 can be formed by transparent conductive material, such as being formed by ITO or IZO etc., or is formed by metal material, such as being formed by Al, Mo, Cr, Pt, W, Cu, Ag, Au etc.
With reference to figure 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 the figure, a plurality of organic illuminating element OLED in parallel between anode signal input PVDD and cathode signal input PVEE, each organic illuminating element is connected with thin-film transistor, in order to input data signal data, the anode signal of organic illuminating element is by the input of anode signal input PVDD end, cathode signal is by the input of cathode signal input PVEE end, cathode signal arrives each organic illuminating element by cathode layer after being inputted by negative electrode via hole place, because cathode layer is many, by transparent conductive material, formed, and cathode layer is thinner, therefore the surface resistance of cathode layer is larger, corresponding each organic illuminating element of cathode layer can be divided into a plurality of resistance R
1.When conductive layer being set on organic light-emitting display device cover plate, conductive layer contacts with cathodic electricity, and corresponding each organic illuminating element of conductive layer is divided into a plurality of resistance R
2, the resistance R that each organic illuminating element is corresponding
1and R
2between be relation in parallel.The R of each organic illuminating element
1with R
2after parallel connection, be chained together, after the resistance of the transmission of cathode signal by a series of series connection, arrive each organic illuminating element, R
0resistance for the cathode layer at negative electrode via hole place.
The electric current that flows through first pixel cell is i
1, the electric current that flows through second pixel cell is i
2, the electric current that flows through the 3rd pixel cell is i
3... the electric current that flows through n pixel cell is i
n, because of the voltage constant between anode signal input PVDD and cathode signal input PVEE, and can produce certain voltage drop through each resistance, so current i
1, i
2, i
3... i
nvalue reduce gradually.Due to resistance R
2be incorporated to, the total value of the corresponding resistance of each organic illuminating element is reduced, thereby also reduces in ohmically voltage drop, therefore, current i
1, i
2, i
3... i
nvalue compared with R
2before being incorporated to, all promote to some extent, and current i
1, i
2, i
3... i
nvalue between difference reduce, thereby cause the luminous intensity difference that organic illuminating element OLED sends also to reduce.Therefore, that is to say that conductive layer has compensating action to the light intensity of organic illuminating element, in macroscopic view, see that to be display brightness more even.
Embodiment bis-
With reference to figure 7 and Fig. 8, the cover plate schematic top plan view of the organic light-emitting display device that Fig. 7 provides for embodiment bis-, Fig. 8 is that Fig. 7 cover plate is along the sectional view of BB ' direction.The organic light-emitting display device that embodiment bis-provides is on the basis of embodiment mono-, and the thickness of the conductive layer 310 of corresponding viewing area diverse location is different, and varied in thickness trend is relevant with the position of negative electrode via hole.
In Fig. 7 and Fig. 8, illustrated negative electrode via hole in viewing area situation all around, in Fig. 7, region shown in region 350 is negative electrode via hole corresponding region, concrete, when array base palte and cover plate are oppositely arranged, negative electrode via area in the 350 corresponding array base paltes of negative electrode via hole corresponding region is negative electrode via area view field on the cover board.
The varied in thickness rule of conductive layer 310 has been shown in Fig. 8, is negative electrode via hole corresponding region 350 in the peripheral regions of substrate 300, the negative electrode via area on corresponding array base palte.Described conductive layer 310, is less than the thickness away from 350 places, negative electrode via hole corresponding region at the thickness that approaches 350 places, negative electrode via hole corresponding region.Apart from negative electrode via hole corresponding region 350 more nearby, thickness is thinner for conductive layer 310.When cover plate and array base palte bonding after, also can think described conductive layer 310, at the thickness that approaches negative electrode via area place, be less than the thickness away from negative electrode via area place.
Although the conductive layer 310 of diverse location has different thickness, because the pixel defining layer on array base palte has certain elasticity, can guarantee that conductive layer 310 and negative electrode on array base palte have effectively electrically contacts, but due to the thick restriction of display unit box, conductive layer 310 is unsuitable blocked up, so the maximum of the thickness of conductive layer 310 2～3 times of minimum value preferably.Certainly, also can between substrate 300 and conductive layer 310, arrange and there is certain thickness insulator spacer, such as organic film etc., to make up the thickness difference between the conductive layer 310 of diverse location, guarantee that conductive layer 310 and negative electrode on array base palte have better to electrically contact.
When negative electrode via hole is arranged on the both sides of viewing area or a side or one jiao, the varied in thickness of conductive layer 310 is followed following rule equally: conductive layer 310 apart from the position of negative electrode via hole more nearby, the thickness of conductive layer 310 is thinner, apart from the position of negative electrode via hole more at a distance, its thickness is thicker for conductive layer 310.
Alternatively, described conductive layer can be for netted, or a plurality of strip, or a plurality of sheet.
Because organic illuminating element is far away apart from negative electrode via hole, the cathode layer series resistance of flowing through when negative electrode drives signal input is more, therefore the distance of organic illuminating element and negative electrode via hole is far away, and its received negative electrode drives the loss of voltage of signal also more, and its light intensity of sending is also more weak.In the present embodiment, at conductive layer 310 apart from negative electrode via hole more at a distance, its thickness is set thinner, less resistance is incorporated in the resistance that the organic illuminating element far away apart from negative electrode via hole is corresponding, resistance value can be reduced to a greater degree, thereby the light-intensity difference between further minimizing and other organic illuminating element that is to say, less resistance is larger to the compensating action of the light intensity of organic illuminating element, can make to show that inhomogenous situation is better improved.
Embodiment tri-
With reference to figure 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 the organic light-emitting display device that embodiment tri-provides, but the density of setting of the conductive layer 410 of viewing area diverse location is done to change, on cover plate, conductive layer 410 is in the distribution density heterogeneity of viewing area, and variation tendency is relevant with the position of negative electrode via hole.
In Fig. 9, illustrated negative electrode via hole in viewing area situation all around, in Fig. 9, region 450 is negative electrode via hole corresponding region, concrete, when array base palte and cover plate are oppositely arranged, the negative electrode via area of negative electrode via hole corresponding region 450 corresponding array base paltes is negative electrode via area view fields on the cover board.Conductive layer 410 has hollow-out parts 411 and non-hollow-out parts 412, region on the corresponding array base palte of non-hollow-out parts 412 outside organic illuminating element, here said correspondence refers to, when array base palte and cover plate are oppositely arranged, in the direction of vertical substrate, the projection of non-hollow-out parts 412 on array base palte drops on the region outside organic illuminating element, can avoid like this conductive layer 410 to block the light that organic illuminating element sends, to improve light transmitance on the cover board.
In the present embodiment, the density of non-hollow-out parts 412 that approaches the conductive layer 410 at 450 places, negative electrode via hole corresponding region is less than the density away from the non-hollow-out parts 412 of the conductive layer 410 at 450 places, negative electrode via hole corresponding region.When cover plate and array base palte bonding after, also can think described conductive layer 410, in non-hollow-out parts 412 density that approach negative electrode via area place, be less than the density away from the non-hollow-out parts 412 at negative electrode via area place.
When negative electrode via hole is arranged on the both sides of viewing area or a side or one jiao, the variable density of the non-hollow-out parts 412 of conductive layer 410 is followed following rule equally: conductive layer 410 apart from the position of negative electrode via area more nearby, the density of the non-hollow-out parts 412 of conductive layer 410 is less, apart from the position of negative electrode via area more at a distance, the density of the non-hollow-out parts 412 of conductive layer 410 is larger for conductive layer 410.
Figure 10 is the cover plate schematic top plan view of the embodiment of the present invention three another kind of execution modes, show conductive layer 410 for the situation of a plurality of horizontal strips, the distribution density of the non-hollow-out parts 412 of the mid portion of viewing area is larger, laterally the conductive layer 410 of the strip density of arranging from centre to both sides reduces, and the distribution density of non-hollow-out parts 412 reduces gradually.
Alternatively, conductive layer can be also a plurality of longitudinal strips, or is a plurality of sheets.
Because organic illuminating element is far away apart from negative electrode via hole, the cathode layer series resistance of flowing through when negative electrode drives signal input is more, therefore the distance of organic illuminating element and negative electrode via hole is far away, and its received negative electrode drives the loss of voltage of signal also more, and its light intensity of sending is also more weak.In the present embodiment, conductive layer is set apart from the position of negative electrode via area more nearby, the density of the non-hollow-out parts of conductive layer is less, conductive layer apart from the position of negative electrode via area more at a distance, the density of the non-hollow-out parts of conductive layer is larger, less resistance is incorporated in the resistance that the organic illuminating element far away apart from negative electrode via hole is corresponding, resistance value can be reduced to a greater degree, thereby the light-intensity difference between further minimizing and other organic illuminating element, that is to say, less resistance is larger to the compensating action of the light intensity of organic illuminating element, can make to show that inhomogenous situation is better improved.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these are revised and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (14)
1. an organic light-emitting display device, described organic light-emitting display device comprises:
The first substrate being oppositely arranged and second substrate;
Be arranged on described first substrate towards a plurality of organic illuminating elements of described second substrate one side, described each organic illuminating element comprises the anode that is arranged on described first substrate, be arranged on organic luminous layer on described anode, be arranged on the negative electrode on described organic luminous layer;
Be arranged on described second substrate towards the conductive layer of described first substrate one side, described conductive layer contacts with described cathodic electricity.
2. organic light-emitting display device as claimed in claim 1, is characterized in that: the negative electrode of described a plurality of organic illuminating elements interconnects and forms a cathode layer.
3. organic light-emitting display device as claimed in claim 2, is characterized in that: described organic light-emitting display device also comprises the negative electrode via hole that is arranged at described first substrate periphery, and described cathode layer obtains negative electrode and drives signal from outside by described negative electrode via hole.
4. organic light-emitting display device as claimed in claim 3, is characterized in that: the thickness at the conductive layer above the cathode layer that approaches described negative electrode via hole place is less than the thickness away from the conductive layer above the cathode layer at described negative electrode via hole place.
5. organic light-emitting display device as claimed in claim 4, is characterized in that: at the cathode layer that approaches described negative electrode via hole place, to the direction of the cathode layer away from described negative electrode via hole place, the thickness of the conductive layer on described cathode layer increases gradually.
6. organic light-emitting display device as claimed in claim 4, is characterized in that: the maximum of the thickness of described conductive layer is 2～3 times of minimum value.
7. organic light-emitting display device as claimed in claim 4, it is characterized in that: described organic light-emitting display device also comprises the separator being arranged on second substrate, described separator between conductive layer and second substrate, the region on the corresponding first substrate of described separator outside organic illuminating element.
8. organic light-emitting display device as claimed in claim 3, is characterized in that: described conductive layer comprises hollow-out parts and non-hollow-out parts, the region on the corresponding first substrate of described non-hollow-out parts outside organic illuminating element.
9. organic light-emitting display device as claimed in claim 8, is characterized in that: the density in the non-hollow-out parts of the conductive layer above the cathode layer that approaches described negative electrode via hole place is less than the density away from the non-hollow-out parts of the conductive layer above the cathode layer at described negative electrode via hole place.
10. organic light-emitting display device as claimed in claim 9, it is characterized in that: at the cathode layer that approaches described negative electrode via hole place, to the direction of the cathode layer away from described negative electrode via hole place, the density of the non-hollow-out parts of the conductive layer on described cathode layer reduces gradually.
11. organic light-emitting display devices as claimed in claim 8, is characterized in that: described conductive layer is netted.
12. organic light-emitting display devices as claimed in claim 8, is characterized in that: described conductive layer be a plurality of strips.
13. organic light-emitting display devices as claimed in claim 8, is characterized in that: described conductive layer is a plurality of sheets.
14. organic light-emitting display devices as claimed in claim 1, is characterized in that: described conductive layer adopts transparent conductive material or metal material to form.
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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. |