CN102916037A - Active-matrix organic light-emitting display and display device - Google Patents
Active-matrix organic light-emitting display and display device Download PDFInfo
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- CN102916037A CN102916037A CN2012103878269A CN201210387826A CN102916037A CN 102916037 A CN102916037 A CN 102916037A CN 2012103878269 A CN2012103878269 A CN 2012103878269A CN 201210387826 A CN201210387826 A CN 201210387826A CN 102916037 A CN102916037 A CN 102916037A
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Abstract
The invention discloses an active-matrix organic light-emitting display and a display device. A threadlike power supply signal wire in the prior art is redesigned and optimized in the way that the threadlike power supply signal wire is changed into a plurality of layers of electrically connected planar power supply signal electrodes covering the whole panel display area. Compared with a threadlike power supply signal wire in an AMLOED (Active Matrix/Organic Light Emitting Diode) in the prior art, the whole multi-layer planar power supply signal electrode can greatly reduce the resistance, so that IR drop caused when the power supply signal electrode transmits a power supply voltage signal is reduced, the influence on the display effect from the IR drop is effectively reduced and the power consumption of the panel is also effectively reduced.
Description
Technical field
The present invention relates to the Display Technique field, relate in particular to a kind of active matrix organic electroluminescent display device and display unit.
Background technology
Organic elctroluminescent device (OLED, Organic Light-Emitting Display) refers to the organic semiconductor luminescent material under electric field driven, by the phenomenon of carrier injection and composite guide photoluminescence.Its principle of luminosity is to utilize indium tin metal oxide (ITO, Indium Tin Oxides) transparency electrode and metal electrode are respectively as anode and the negative electrode of device, under certain voltage drives, electronics and hole are injected into electronics and hole transmission layer from negative electrode and anode respectively, luminescent layer is moved to through electronics and hole transmission layer respectively in electronics and hole, and in luminescent layer, meet and form exciton light emitting molecule is excited, the latter sends visible light through radiative relaxation.OLED has thinner lighter, active illuminating (not needing backlight), without visual angle problem, high definition, high brightness, response is quick, energy consumption is low, the serviceability temperature scope is wide, shock resistance is strong, cost is low and can realize the advantage such as soft demonstration.
OLED can be divided into passive drive and active driving two large classes, i.e. direct addressin and thin-film transistor (TFT) matrix addressing two classes according to type of drive.Wherein, each luminescence unit of being also referred to as in active matrix (AM) type of active driving is independently controlled by the TFT addressing.The dot structure that luminescence unit and TFT addressing circuit form need to load DC power supply voltage signal (VDD) to it by power signal line and drive.
And the wire laying mode of power signal line in the present AMOLED panel, as shown in Figure 1, generally be at the gap location setting of every row dot structure and dot structure power signal line one to one, and the peripheral power supply holding wire that a trap is closed is set outside the viewing area of panel, will be transferred to respectively in the coupled dot structure by these power signal lines from the DC power supply voltage signal (VDD) of signal source IC.As shown in Figure 2, it is the wire laying mode of another kind of power signal line, with respect to wire laying mode shown in Figure 1, the wire laying mode of Fig. 2 has increased power signal line between every row dot structure, with the power signal line of newly-increased horizontal wiring and the vertically power signal line interconnection of wiring, consist of a network structure, and and the viewing area outside the peripheral power supply holding wire be connected, this wire laying mode can effectively reduce the voltage attenuation (IR Drop) of DC power supply voltage signal when power signal line transmits, thereby the power consumption of reduction AMOLED panel and voltage attenuation are on the impact of display effect.
When the wire laying mode of above-mentioned power signal line is used for undersized AMOLED, can effectively improve voltage attenuation on the power signal line to the impact of display effect, and the power consumption of panel is decreased, but along with the increase of AMOLED size, the wire laying mode of above-mentioned power signal line can not solve voltage attenuation effectively on impact and the panel power problems of display effect.
Summary of the invention
The embodiment of the invention provides a kind of active matrix organic electroluminescent display device and display unit, has the voltage attenuation of power signal line among the AMOLED now to the impact of display effect and panel power consumption in order to effective minimizing.
A kind of active matrix organic electroluminescent display device that the embodiment of the invention provides, comprise and be a plurality of dot structures that matrix is arranged, also comprise: the power supply signal structure that power supply signal is provided for each described dot structure, described power supply signal structure comprises the two-layer at least power supply signal electrode that is electrical connected, and every layer of described power supply signal electrode has planar structure.
A kind of display unit that the embodiment of the invention provides comprises the above-mentioned active matrix organic electroluminescent display device that the embodiment of the invention provides.
The beneficial effect of the embodiment of the invention comprises:
A kind of active matrix organic electroluminescent display device and display unit that the embodiment of the invention provides, the power signal line of wire in the prior art has been carried out redesign optimization, it is changed to the power supply signal electrode of the planar structure of whole the cover plate viewing area that multilayer is electrical connected by wire, power signal line with respect to wire among the AMOLED in the prior art, the planar power supply signal electrode of multilayer monoblock can greatly reduce its resistance, thereby the voltage attenuation when reducing power supply signal electrode transmission power supply voltage signal, effectively reduce voltage attenuation to the impact of display effect, and effectively reduced the power consumption of panel.
Description of drawings
Fig. 1 is one of wire structures schematic diagram of power signal line among the AMOLED of prior art;
Fig. 2 be power signal line among the AMOLED of prior art the wire structures schematic diagram two;
One of structural representation of the AMOLED panel with power supply signal structure that Fig. 3 provides for the embodiment of the invention;
The concrete structure schematic diagram of dot structure among the AMOLED that Fig. 4 provides for the embodiment of the invention;
Two of the structural representation of the AMOLED panel with power supply signal structure that Fig. 5 provides for the embodiment of the invention;
The structural representation of the bottom-emission type AMOLED that Fig. 6 a, Fig. 6 b and Fig. 6 c provide for the embodiment of the invention;
The structural representation of the top emission type AMOLED that Fig. 7 a, Fig. 7 b and Fig. 7 c provide for the embodiment of the invention;
The structural representation of the AMOLED panel with power supply signal electrode and electrode signal line that Fig. 8 and Fig. 9 provide for the embodiment of the invention;
The structural representation of low level signal electrode among the AMOLED that Figure 10 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, the active matrix organic electroluminescent display device that the embodiment of the invention is provided and the embodiment of display unit are described in detail.
Each layer film thickness and area size do not reflect true ratio in the accompanying drawing, and purpose is signal explanation content of the present invention just.
A kind of active matrix organic electroluminescent display device (OLED) that the embodiment of the invention provides, as shown in Figure 3, specifically comprise: be a plurality of dot structures that matrix is arranged, also comprise: the power supply signal structure that power supply signal is provided for each dot structure, this power supply signal structure comprises the two-layer at least power supply signal electrode that is electrical connected, and every layer of power supply signal electrode has planar structure.
The above-mentioned AMOLED that the embodiment of the invention provides, the power signal line of wire in the prior art has been carried out redesign optimization, it is changed to the power supply signal electrode of the planar structure of whole cover plate viewing area of multilayer by wire, the planar power supply signal electrode of multilayer monoblock can greatly reduce its resistance, thereby the voltage attenuation when reducing power supply signal electrode transmission power supply voltage signal, effectively reduce voltage attenuation to the impact of display effect, and effectively reduced the power consumption of panel.
The below is elaborated to the dot structure of above-mentioned AMOLED and the concrete structure of power supply signal structure.
Particularly, in AMOLED dot structure generally by be positioned at successively resilient coating on the lower underlay substrate, control TFT structure, organic EL ray structure and on underlay substrate form, as shown in Figure 4, control TFT structure can specifically comprise: active layer, gate insulation layer, grid, protective layer, source-drain electrode, the first insulating barrier; In addition, control TFT structure also can be traditional top gate type or bottom gate type structure, does not do restriction at this.Organic electroluminescence EL ray structure can specifically comprise: pixel electrode, edge protection layer, hole transmission layer, organic luminous layer, electron transfer layer, negative electrode; In addition, can also comprise retes such as electronic barrier layer and hole blocking layer, not do detailed description at this.
General and the together layer setting of source-drain electrode of the power signal line of wire namely forms power signal line and source-drain electrode by a composition technique in the prior art; And among the AMOLED that the embodiment of the invention provides, power signal line is redesigned into the multilayer power supply signal electrode of planar structure, in order not affect the normal operation of dot structure, in the specific implementation, take the power supply signal structure specifically comprise two-layer power supply signal electrode namely the first power supply signal electrode and second source signal electrode as the example explanation, as shown in Figure 5, the first power supply signal electrode can be arranged between resilient coating and the lower underlay substrate, the second source signal electrode can be arranged between the negative electrode and upper underlay substrate in organic EL ray structure, and by the second insulating barrier and negative electrode mutually insulated.Certainly this two-layer power supply signal electrode also can be arranged between resilient coating and the lower underlay substrate or between negative electrode and the upper underlay substrate simultaneously, and also can consist of the power supply signal structure by the power supply signal electrode more than two-layer, does not do restriction at this.
Particularly, the above-mentioned AMOLED that provides of the embodiment of the invention can be applied to top emission type and bottom-emission type AMOLED.And, in order to reduce resistance, multilayer power supply signal electrode generally is by opaque metal, like this, in order not affect the normally luminous of dot structure, in the specific implementation, when dot structure is the bottom-emission type, the first power supply signal electrode between resilient coating and lower underlay substrate, shown in Fig. 6 a, Fig. 6 b and Fig. 6 c, should be arranged to the pattern of nothing the first power supply signal electrode in the zone corresponding with the luminescence window of each dot structure, can normally penetrate by luminescence window to guarantee the light that organic luminous layer inspires.
In like manner, in the specific implementation, when dot structure is top emission type, second source signal electrode between negative electrode and upper underlay substrate, shown in Fig. 7 a, Fig. 7 b and Fig. 7 c, should be arranged to the pattern without the second source signal electrode in the zone corresponding with the luminescence window of each dot structure, can normally penetrate by luminescence window to guarantee the light that organic luminous layer inspires.
Particularly, because the power supply signal structure is not arranged in each rete of dot structure, in order to guarantee that the power supply signal structure can normally provide power supply voltage signal to dot structure, in the specific implementation, the first power supply signal electrode and second source signal electrode directly can be electrical connected by via hole, and with the first power supply signal electrode or second source signal electrode by the active layer in via hole and the control TFT structure, pixel electrode in source-drain electrode or the organic EL ray structure is electrical connected, for example: shown in Fig. 6 c and Fig. 7 c, the first power electrode and second source electrode directly are electrical connected by via hole, and the first power supply signal electrode is electrical connected by via hole and source-drain electrode.In the specific implementation, can also with the first power supply signal electrode and second source signal electrode by via hole respectively with control TFT structure in active layer, source-drain electrode or organic EL ray structure in pixel electrode be electrical connected, for example: shown in Fig. 6 a and 7a, the first power supply signal electrode is electrical connected by via hole and active layer, and the second source signal electrode is electrical connected by via hole and pixel electrode; Shown in Fig. 6 b and 7b, the first power supply signal electrode is electrical connected by via hole and source-drain electrode, and the second source signal electrode is electrical connected by via hole and pixel electrode.The above-mentioned annexation that just illustrates each rete in the first power supply signal electrode and second source signal electrode and the dot structure is not limited to this in the specific implementation.
The below is elaborated to its preparation process take the AMOLED structure shown in Fig. 6 a as example, and its preparation technology specifically may further comprise the steps:
1, namely descend underlay substrate deposition layer of metal layer at blank glass, the techniques such as the etching of the exposure that utilizes a time composition technique is mask plate, development, metal level, photoresist lift off form the power supply signal electrode pattern.
2, deposit resilient coating at the power supply signal electrode pattern, this resilient coating can use SiNx/SiO
2Double layer material form, be formed for connecting the via hole of power supply signal electrode and the active layer that will form by composition technique, power supply voltage signal can be transferred in the active layer of dot structure by this via hole power supply signal electrode.
3, deposited amorphous silicon semiconductor layer on resilient coating adopts low temperature polycrystalline silicon technique with its amorphous silicon crystallization afterwards, forms polysilicon (P-Si), utilizes afterwards a composition technique to form active layer pattern.
4, the figure at active layer forms gate insulation layer (GI), and specifically this GI layer can use SiO
2The double layer material of/SiNx forms.
5, deposit gate metal layer at the GI layer, utilize one-time process to form grid and signal line graph.
6, the grid that utilizes formation carries out Implantation (Doping) technique as the barrier layer to the active layer zone corresponding with the source-drain electrode that will form, and carries out afterwards ion-activated technique.
7, the figure at grid and signal line forms protective layer (ILD), and is formed for connecting respectively the via hole of active layer and the source-drain electrode that will form by composition technique.
8, form the source-drain electrode metal level at protective layer, and form the figure of source-drain electrode and data signal line by composition technique.
9, at source-drain electrode metal level deposition the first insulating barrier (SiNx/SiO
2) and planarization layer (PLN) and resin material, carry out afterwards hydrogenation process to promote the crystallization characteristic of active layer.The via hole of the pixel electrode that utilizes composition technique to be formed for connecting source-drain electrode and will form.
10, pixel deposition electrode layer (ITO) on the first insulating barrier and planarization layer, and by a composition technique formation pixel electrode figure.
11, on the pixel electrode figure, form successively edge protection layer (PDL), hole transmission layer, organic luminous layer, electron transfer layer and negative electrode, the upper underlay substrate of fitting at last.
Preferably, in order further to reduce the resistance of power supply signal electrode, the above-mentioned AMOLED that the embodiment of the invention provides, as shown in Figure 8, the power supply signal structure can also comprise: with a power signal line of controlling the same layer setting of source-drain electrode in the TFT structure, this power signal line is in parallel with every layer of power supply signal electrode, further reduces the resistance of each layer power supply signal electrode, thereby reduces the voltage attenuation of power supply voltage signal when transmission.In the specific implementation, for example: can power signal line and active layer be electrical connected by via hole, and each layer power supply signal electrode and active layer be electrical connected by via hole, like this, power signal line and each layer power supply signal electrode have just formed parallel-connection structure, as shown in Figure 9, can certainly both be formed parallel-connection structure by other concrete structures, not do restriction at this.
Further, among the above-mentioned AMOLED that the embodiment of the invention provides, can also comprise: with at least one deck low level signal electrode (VSS) that negative electrode in organic EL ray structure is electrical connected, every layer of low level signal electrode all has planar structure.Particularly, as shown in figure 10, every layer of low level signal electrode can be electrical connected by via hole, further reduces the resistance of low level signal electrode, thereby reduces the power consumption of VSS.
Based on same inventive concept, the embodiment of the invention also provides a kind of display unit, comprise the above-mentioned active matrix organic electroluminescent display device that the embodiment of the invention provides, the enforcement of this display unit can referring to the embodiment of above-mentioned active matrix organic electroluminescent display device, repeat part and repeat no more.
A kind of active matrix organic electroluminescent display device and display unit that the embodiment of the invention provides, the power signal line of wire in the prior art has been carried out redesign optimization, it is changed to the power supply signal electrode of the planar structure of whole cover plate viewing area of multilayer by wire, power signal line with respect to wire among the AMOLED in the prior art, the planar power supply signal electrode of multilayer monoblock can greatly reduce its resistance, thereby the voltage attenuation when reducing power supply signal electrode transmission power supply voltage signal, effectively reduce voltage attenuation to the impact of display effect, and effectively reduced the power consumption of panel.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. active matrix organic electroluminescent display device, comprise and be a plurality of dot structures that matrix is arranged, it is characterized in that, also comprise: the power supply signal structure that power supply signal is provided for each described dot structure, described power supply signal structure comprises the two-layer at least power supply signal electrode that is electrical connected, and every layer of described power supply signal electrode has planar structure.
2. device as claimed in claim 1 is characterized in that, described dot structure has resilient coating, control thin-film transistor TFT structure, organic electroluminescence EL ray structure and the upper underlay substrate that is positioned at successively on the lower underlay substrate.
3. device as claimed in claim 2 is characterized in that, described power supply signal structure specifically comprises the first power supply signal electrode and second source signal electrode; Wherein,
Described the first power supply signal electrode is between described resilient coating and lower underlay substrate;
Between the negative electrode and upper underlay substrate of described second source signal electrode in described organic EL ray structure, and by the second insulating barrier and described negative electrode mutually insulated.
4. device as claimed in claim 3 is characterized in that, described dot structure is the bottom-emission type, and described the first power supply signal electrode is the pattern without described the first power supply signal electrode in the zone corresponding with the luminescence window of each dot structure.
5. device as claimed in claim 3 is characterized in that, described dot structure is top emission type, and described second source signal electrode is the pattern without described second source signal electrode in the zone corresponding with the luminescence window of each dot structure.
6. such as each described device of claim 3-5, it is characterized in that, described the first power supply signal electrode and second source signal electrode are electrical connected by via hole, and described the first power supply signal electrode or second source signal electrode are electrical connected by the pixel electrode in active layer, source-drain electrode or the organic EL ray structure in via hole and the described control TFT structure.
7. such as each described device of claim 3-5, it is characterized in that, described the first power supply signal electrode and second source signal electrode by via hole respectively with described control TFT structure in active layer, source-drain electrode or, pixel electrode in organic EL ray structure is electrical connected.
8. such as each described device of claim 2-5, it is characterized in that described power supply signal structure also comprises: with the same layer of power signal line that arranges of source-drain electrode in the described control TFT structure, described power signal line is in parallel with every layer of described power supply signal electrode.
9. such as each described device of claim 2-5, it is characterized in that, also comprise: with at least one deck low level signal electrode that negative electrode in described organic EL ray structure is electrical connected, every layer of described low level signal electrode has planar structure.
10. a display unit is characterized in that, comprises each described active matrix organic electroluminescent display device such as claim 1-9.
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