CN103022081B - Array substrate, preparation method of array substrate and organic light emitting diode display device - Google Patents
Array substrate, preparation method of array substrate and organic light emitting diode display device Download PDFInfo
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Abstract
The invention provides an array substrate, a preparation method of the array substrate and an organic light emitting diode display device, belongs to the technical field of organic light emitting diode display and can solve the problem that existing organic light emitting diode display devices are complicated in the preparing process and high in costs. A pixel unit of the array substrate comprises a thin film transistor driving layer, an organic light emitting diode, a reflection layer and a color film; the organic light emitting diode sequentially comprises a first electrode, a light emitting layer and a second electrode; the second electrode is a half-reflection half-transparent layer or the second electrode is transparent, and the half-reflection half-transparent layer is arranged on the second electrode; the half-reflection half-transparent layer is provided with a concave-convex structure or a wave structure for light to produce diffuse reflection; the reflection layer is located between the thin film transistor driving layer and the organic light emitting diode, and the reflection layer and the half-reflection half-transparent layer form a microcavity structure; and the color film is located between the reflection layer and the organic light emitting diode, and the surface of the color film, which contacts with the organic light emitting diode, is provided with a concave-convex structure or a wave structure. The array substrate is particularly applicable to white organic light emitting diode display devices.
Description
Technical field
The invention belongs to organic light-emitting diode display technical field, be specifically related to a kind of array base palte and preparation method thereof, organic LED display device.
Background technology
Organic Light Emitting Diode (OLED, Organic Light Emitting Diode) is a kind of electroluminescent device of organic thin film, the advantages such as preparation technology is simple, cost is low, luminous efficiency is high, easy formation flexible structure that it has.Therefore, the Display Technique of Organic Light Emitting Diode is utilized to become a kind of important Display Technique.
Organic LED display device comprises multiple pixel cell, is provided with an Organic Light Emitting Diode in each pixel cell, can be controlled their luminous intensity by the electric current controlling each Organic Light Emitting Diode, thus realizes display.Wherein, each " visible pixels " on display is made up of multiple adjacent and pixel cell sending different colours light, becomes the light that this " visible pixels " sends after the light mixing that each pixel cell sends; The color (i.e. the color of color film) of the pixel cell of composition " visible pixels " can have multiple different mode, such as RGB (RGB) pattern (namely red pixel cell, green pixel cell, a yellow pixel cells form " visible pixels "), RGBW (red, green, blue and white) pattern, RGBY (red, green, blue and yellow) pattern etc.
Because the Technical comparing of white organic LED (WOLED) is ripe, luminous efficiency is high, and therefore it is applied widely in organic LED display device.
As shown in Figure 1, one " visible pixels " of white organic LED display unit can comprise red, green, blue three pixel cells 9R, 9G, 9B (certainly also can be other patterns) of being located on substrate 7, be provided with thin-film transistor (TFT) in each pixel cell 9R, 9G, 9B and drive layer 1, drive color film 3R, 3G, the 3B (also known as colored filter) that layer 1 are provided with successively anode (the first electrode 21), luminescent layer 23, negative electrode (the second electrode 22), confining bed 8 (Encapsulation), respective color at thin-film transistor.Wherein, anode, luminescent layer 23, negative electrode are configured with OLED 2, thin-film transistor drives layer 1 can the anode of drive each pixel cell 9R, 9G, 9B, thus make each Organic Light Emitting Diode 2 send the light of different brightness, these light become different colours after corresponding color film 3R, 3G, 3B, and are mixed into " visible pixels " issued light.
For improving luminous efficiency, microcavity (Micro Cavity) structure can be formed in organic LED display device.Micro-cavity structure refers to that the thickness formed between a reflector and the anti-semi-permeable layer of half is the structure of micron dimension, light constantly can reflect at two interlayers, due to resonance effect, therefore the light of final specific wavelength from the light of half-reflection and half-transmission layer injection can be strengthened, and the wavelength that this is strengthened is relevant with microcavity thickness.
In white organic LED display unit, different pixels unit is light for sending different colours, therefore the microcavity at different pixels unit place should be able to make the light of different wave length (light identical with its color film color) obtain to strengthen, and namely the microcavity thickness at different pixels unit place should be different.For reaching this purpose, as shown in Figure 2, can take negative electrode as half-reflection and half-transmission layer 6 in white organic LED display unit, and anode be set to hyaline layer, and below anode, set up reflector 4; Like this, as long as regulate the thickness of each anode can control the thickness of the micro-cavity structure of respective pixel unit 9R, 9G, 9B.
Inventor finds that in prior art, at least there are the following problems: each anode of array base palte is in same layer, originally can be formed in a patterning processes simultaneously, but in the white organic LED display unit with microcavity, anode thickness in each pixel cell is different, therefore they will be formed respectively in repeatedly patterning processes, or duotone mask plate will be used in patterning processes, and these all can cause complicated process of preparation, cost high.
Summary of the invention
Technical problem to be solved by this invention comprises, and the array base palte complicated process of preparation having a micro-cavity structure for of the prior art, the problem that cost is high, provide the array base palte that a kind of preparation technology is simple, cost is low, luminous efficiency is high.
The technical scheme that solution the technology of the present invention problem adopts is a kind of array base palte, and it comprises multiple pixel cell be positioned on substrate, and described pixel cell comprises: thin-film transistor drives layer; Drive layer further from substrate than described thin-film transistor and the Organic Light Emitting Diode driving layer to drive by thin-film transistor, away from the direction of substrate, Organic Light Emitting Diode comprises the first transparent electrode, luminescent layer, the second electrode successively, wherein, described second electrode is half-reflection and half-transmission layer, or described second electrode is transparent and which is provided with half-reflection and half-transmission layer; And described half-reflection and half-transmission layer has for making light produce irreflexive concaveconvex structure or wave structure; Reflector, it is positioned at described thin-film transistor and drives between layer and Organic Light Emitting Diode, and forms micro-cavity structure with described half-reflection and half-transmission layer; To be arranged between described reflector and Organic Light Emitting Diode and to be in the color film of micro-cavity structure, the face that described color film contacts with Organic Light Emitting Diode has concaveconvex structure or wave structure.
Wherein, " thin-film transistor driving layer " refers to the array architecture of thin film transistor for driving Organic Light Emitting Diode, and it comprises the sandwich constructions such as thin-film transistor, scan line, data wire, power voltage line, insulating barrier, passivation layer." Organic Light Emitting Diode " refers to by the first electrode, the second electrode and the structure being clipped in the energy luminescence that two interelectrode luminescent layers are formed, the second electrode and luminescent layer may be only had and without the first electrode (the first electrode therefore in each pixel cell is separate) at the portion (position as between each pixel cell) of substrate, or between electrode and luminescent layer, also can be provided with the pixel confining layers of insulation, these positions can not be luminous, therefore be not " Organic Light Emitting Diode "; Therefore, as long as reflector is positioned at the position relative with " Organic Light Emitting Diode " with color film, and reflector and color film can be there is no in the region not forming " Organic Light Emitting Diode "." luminescent layer " refers to structure that can be luminous under the function of current, and it can be single layer structure, also can be made up of multiple different layer; " luminescent layer " at least comprises an electroluminescent organic material layer (EML), but it also can comprise: be positioned at the electron transfer layer (ETL) between electroluminescent organic material layer and cathode layer and electron injecting layer (EIL); Be positioned at other structures such as hole injection layer (HIL) and hole transmission layer (HTL) between electroluminescent organic material layer and anode layer." concaveconvex structure or wave structure " refers on the thickness direction of array base palte, and the height of each layer diverse location is different, thus the light making to be irradiated to (mainly on finger half-reflection and half-transmission layer) on it diffuse reflection can occur; Concrete, " concaveconvex structure or wave structure " is raised points or the depression points of pressing site formal distribution, also can be the structure of the undulating movement of strip, as long as it can make each layer uneven; Obviously, due to the color film in the present invention having concaveconvex structure or wave structure, and each layer thickness in Organic Light Emitting Diode is thinner, and by the material manufacture without mobility, therefore Organic Light Emitting Diode (comprising half-reflection and half-transmission layer) nature can form the concaveconvex structure corresponding to the concaveconvex structure on color film or wave structure or wave structure.
In array base palte of the present invention, color film is between reflector and Organic Light Emitting Diode, and between the second electrode (or the half-reflection and half-transmission layer on the second electrode) and reflector, form micro-cavity structure, therefore color film is among microcavity, therefore microcavity thickness is regulated by controlling color film thickness, because the color film of the pixel cell of different colours originally will be formed in different step, therefore their thickness can be individually controlled easily, therefore array base palte preparation technology of the present invention is simple, cost is low; Meanwhile, because half-reflection and half-transmission layer has concaveconvex structure or wave structure, therefore can there is diffuse reflection in light in microcavity, thus the light amount of final injection is increased, and improve luminous efficiency, find after deliberation, luminous efficiency can be improved about 50% by this structure; In addition, reflector and Organic Light Emitting Diode is provided with because its thin-film transistor drives above layer, therefore thin-film transistor position also can be used for luminescence on the one hand, aperture opening ratio is high, luminous efficiency is high, and on the other hand, reflector can stop light to be mapped on thin-film transistor, thus reduce its leakage current, make display accurate.
Preferably, described luminescent layer is the luminescent layer for sending white light.
Further preferably, the described luminescent layer for sending white light comprises: the overlapping electroluminescent organic material layer glowed, the electroluminescent organic material layer of green light, the electroluminescent organic material layer of blue light-emitting; Or the electroluminescent organic material layer to be mixed into by the electroluminescent organic material of the electroluminescent organic material glowed, green light, the electroluminescent organic material of blue light-emitting.
That is, luminescent layer sends white light by multiple different mode, as can by the overlapping setting of electroluminescent organic material layer of rubescent, green, blue three color light (certainly also can adopt other color combination), thus the light making them send be mixed into white light; Or also electroluminescent organic material that is rubescent, green, blue three color light can be mixed into an electroluminescent organic material layer, make it emit white light.
Preferably, described thin-film transistor drives layer to comprise scan line, data wire, power voltage line, many cluster films transistor, and every cluster film transistor is for driving the Organic Light Emitting Diode in a pixel cell; Wherein, every cluster film transistor comprises a switching thin-film transistor and a driving thin-film transistor, and the grid of described switching thin-film transistor connects scan line, source electrode connection data line, and drain electrode connects the grid driving thin-film transistor; Drive the source electrode of thin-film transistor to connect power voltage line, drain electrode is connected with the first electrode of OLED.
Preferably, be provided with via hole in described color film, described first electrode drives layer to be electrically connected by described via hole with thin-film transistor, and described via hole place is provided with the pixel confining layers of the insulation between the first electrode and luminescent layer.
Preferably, described reflector by any one metal in silver, aluminium, molybdenum, copper, titanium, chromium or in them alloy of any two kinds or more form, and reflectivity is between 80 ~ 100%, and thickness exists
between.
Preferably, described half-reflection and half-transmission layer by any one metal in silver, aluminium, molybdenum, copper, titanium, chromium or in them alloy of any two kinds or more form, and transmitance is between 5 ~ 95%, and thickness exists
between.
Preferably, described color film thickness exists
between.
Preferably, described color film comprises: red color film, green tint film, blue color film; Or red color film, green tint film, blue color film, white color film; Or red color film, green tint film, blue color film, yellow color film.
That is, the color of the color film formed in each pixel cell of " visible pixels " can have above multiple different mode; Certainly, if adopt other color mode, be also feasible.
Preferably, described first electrode is the negative electrode of Organic Light Emitting Diode, and described second electrode is the anode of Organic Light Emitting Diode; Or described first electrode is the anode of Organic Light Emitting Diode, described second electrode is the negative electrode of Organic Light Emitting Diode.
Technical problem to be solved by this invention also comprises, and the array base palte complicated process of preparation having a micro-cavity structure for of the prior art, the problem that cost is high, provide the array base palte preparation method that a kind of technique is simple, cost is low, luminous efficiency is high.
The technical scheme that solution the technology of the present invention problem adopts is a kind of array base palte preparation method, and it comprises: formed on substrate and comprise the figure that thin-film transistor drives layer; The substrate completing abovementioned steps comprises the figure in reflector; The substrate completing abovementioned steps is formed the figure comprising color film, and form concaveconvex structure or wave structure on described color film; The substrate completing abovementioned steps is formed the figure including OLED, and make described reflector relative with Organic Light Emitting Diode, described color film is between reflector and Organic Light Emitting Diode; Wherein, the electrode of the close substrate of described Organic Light Emitting Diode is transparent; The electrode away from substrate of described Organic Light Emitting Diode is half-reflection and half-transmission layer, or the electrode away from substrate of described Organic Light Emitting Diode transparent and its on also to form half-reflection and half-transmission layer; And described half-reflection and half-transmission layer has for making light produce irreflexive concaveconvex structure or wave structure.
Wherein, the method for " forming certain layer or certain structure " is various, and it can be form complete rete by modes such as coating, printing, depositions (sputtering, evaporation, chemical vapour deposition (CVD) etc.); Also can be directly form required figure by modes such as printing, control depositions; Also can form required figure by " patterning processes ", wherein " patterning processes " generally includes steps such as forming complete rete, photoresist coating, exposure, development, etching, photoresist lift off.
Prepared by array base palte preparation method of the present invention is above-mentioned array base palte, its color film is arranged in microcavity, as long as therefore control thickness and the adjustable microcavity thickness of each color film respectively when forming the color film of different colours, and need not increase new step, therefore its preparation technology is simple, cost is low; Again owing to having concaveconvex structure or wave structure in its microcavity, therefore its luminous efficiency is high.
Preferably, described color film forms concaveconvex structure or wave structure comprises: by printing technology or use the patterning processes of duotone mask plate to form concaveconvex structure or wave structure on described color film.
Wherein, " use the patterning processes of duotone mask plate " and mainly refer to utilize duotone mask plate to control (comprising intermediate tone mask plate and grayscale mask plate) exposure of photoresist diverse location, part photoresist generating portion is exposed, in etch step afterwards, make the layer generating portion under it etch thus, thus produce surface relief structure or wave structure.
Preferably, the figure of described color film comprises and is communicated with the via hole that thin-film transistor drives layer; And the described figure including OLED that formed on substrate comprises: the figure being formed the first transparent electrode by patterning processes, described first electrode drives layer to be electrically connected by described via hole with thin-film transistor; The figure of the pixel confining layers of the insulation be at least positioned at above described via hole is formed by patterning processes; The substrate completing abovementioned steps forms luminescent layer; This step be following any one in both: the second electrode forming half-reflection and half-transmission on the substrate completing abovementioned steps; Or, the substrate completing abovementioned steps is formed the second transparent electrode, and forms half-reflection and half-transmission layer on the second electrode.
Technical problem to be solved by this invention also comprises, the organic LED display device complicated process of preparation having a micro-cavity structure for of the prior art, the problem that cost is high, provide the organic LED display device that a kind of preparation technology is simple, cost is low, luminous efficiency is high.
The technical scheme that solution the technology of the present invention problem adopts is a kind of organic LED display device, and it comprises above-mentioned array base palte.
In organic LED display device of the present invention, there is above-mentioned array base palte, therefore its preparation technology is simple, cost is low, luminous efficiency is high.
The present invention is specially adapted in white organic LED (WOLED) display unit.
Accompanying drawing explanation
Fig. 1 is the part section structural representation of existing array base palte;
Fig. 2 is the existing part section structural representation with the array base palte of micro-cavity structure;
Fig. 3 is the part section structural representation of the array base palte of embodiments of the invention 2;
Fig. 4 is the equivalent circuit diagram of the OLED driver circuit of the array base palte of embodiments of the invention 2;
Fig. 5 is the part section structural representation of the array base palte after forming thin-film transistor driving layer in the array base palte preparation method of embodiments of the invention 4;
Fig. 6 is the part section structural representation of the array base palte after forming reflector in the array base palte preparation method of embodiments of the invention 4;
Fig. 7 is the part section structural representation of the array base palte after forming color film in the array base palte preparation method of embodiments of the invention 4;
Fig. 8 is the part section structural representation of the array base palte after forming pixel confining layers in the array base palte preparation method of embodiments of the invention 4.
Wherein Reference numeral is: 1, thin-film transistor drives layer; 111, switching thin-film transistor grid; 112, switching thin-film transistor source electrode; 113, switching thin-film transistor drain electrode; 114, switching thin-film transistor active area; 121, thin-film transistor gate is driven; 122, thin-film transistor source electrode is driven; 123, thin-film transistor drain electrode is driven; 124, thin-film transistor active area is driven; 12, gate insulator; 13, spacer insulator layer; 14, passivation layer; 2, Organic Light Emitting Diode; 21, the first electrode; 22, the second electrode; 23, luminescent layer; 3, color film; 3R, red color film; 3G, green tint film; 3B, blue color film; 4, reflector; 6, half-reflection and half-transmission layer; 7, substrate; 8, confining bed; 9R, red pixel cell; 9G, green pixel cell; 9B, blue pixel cells; 91, pixel confining layers; DATA, data wire; SCAN, scan line; Vdd, power voltage line; Cs, storage capacitance.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1:
The present embodiment provides a kind of array base palte, and it comprises multiple pixel cell be positioned on substrate; And pixel cell comprises:
Thin-film transistor drives layer.
Drive layer further from substrate than described thin-film transistor and the Organic Light Emitting Diode driving layer to drive by thin-film transistor, away from the direction of substrate, Organic Light Emitting Diode comprises the first transparent electrode, luminescent layer, the second electrode successively, wherein, described second electrode is half-reflection and half-transmission layer, or described second electrode is transparent and which is provided with half-reflection and half-transmission layer; And described half-reflection and half-transmission layer has for making light produce irreflexive concaveconvex structure or wave structure.
Reflector, it is positioned at described thin-film transistor and drives between layer and Organic Light Emitting Diode, and forms micro-cavity structure with described half-reflection and half-transmission layer.
To be arranged between described reflector and Organic Light Emitting Diode and to be in the color film of micro-cavity structure, the face that described color film contacts with Organic Light Emitting Diode has concaveconvex structure or wave structure.
In the array base palte of the present embodiment, color film is between reflector and Organic Light Emitting Diode, and between the second electrode (or the half-reflection and half-transmission layer on the second electrode) and reflector, form micro-cavity structure, therefore color film is among microcavity, therefore microcavity thickness is regulated by controlling color film thickness, because the color film of the pixel cell of different colours originally will be formed in different step, therefore their thickness can be individually controlled easily, therefore the array base palte preparation technology of the present embodiment is simple, cost is low; Meanwhile, because half-reflection and half-transmission layer has concaveconvex structure or wave structure, therefore can there is diffuse reflection in light in microcavity, thus the light amount of final injection is increased, and improve luminous efficiency, find after deliberation, luminous efficiency can be improved about 50% by this structure; In addition, reflector and Organic Light Emitting Diode is provided with because its thin-film transistor drives above layer, therefore thin-film transistor position also can be used for luminescence on the one hand, aperture opening ratio is high, luminous efficiency is high, and on the other hand, reflector can stop light to be mapped on thin-film transistor, thus reduce its leakage current, make display accurate.
Embodiment 2:
As shown in Figure 3, Figure 4, the present embodiment provides a kind of array base palte, and it comprises multiple pixel cell be positioned on substrate 7; Wherein, multiple adjacent pixel cell with the color film 3 of different colours forms " visible pixels " on a display.Wherein, the color of color film can by multiple different pattern.Preferably, color film comprises red color film, green tint film, blue color film (RGB pattern); Or comprise red color film, green tint film, blue color film, white color film (RGBW pattern); Or comprise red color film, green tint film, blue color film, yellow color film (RGBY pattern).
As shown in Figure 3, on the direction gradually away from substrate 7, array base palte comprises thin-film transistor successively and drives layer 1, reflector 4, color film 3, Organic Light Emitting Diode 2, confining bed 8.
Wherein, thin-film transistor driving layer 1 is the thin film transistor (TFT) array for driving Organic Light Emitting Diode 2 luminescence, and it mainly comprises the structures such as thin-film transistor, scan line SCAN, data wire DATA, power voltage line Vdd, gate insulator 12, spacer insulator layer 13, passivation layer 14.
Wherein, each thin-film transistor is preferably metal oxide thin-film transistor, as zinc tin oxide (ZnSnO) thin-film transistor, indium gallium zinc oxide (IGZO) thin-film transistor etc., the advantages such as structure is simple because metal oxide thin-film transistor has, easily preparation, mobility is high, homogeneity is good.Certainly, if use amorphous silicon film transistor, OTFT etc. to be also feasible.
Preferably, a kind of thin-film transistor drives the structure of layer 1 as shown in Figure 3, comprise many cluster films transistor, every cluster film transistor controls pixel cell, and every cluster film transistor comprises a switching thin-film transistor and a driving thin-film transistor, two thin-film transistors have separately independently active area 114,124 respectively.Wherein, the grid 111 of switching thin-film transistor connects scan line SCAN, source electrode 112 connection data line DATA, and drain electrode 113 connects the grid 121 driving thin-film transistor; And drive the source electrode 122 of thin-film transistor to connect power voltage line Vdd, drain electrode 123 is connected with the first electrode 21 (i.e. anode) of OLED 2, and and form storage capacitors Cs between the drain electrode 113 of switching thin-film transistor, thus form equivalent electric circuit as shown in Figure 4.Wherein, thin-film transistor is driven between each structure in layer 1 and is separated by gate insulation layer 12 and spacer insulator layer 13, and is separated by passivation layer 14 between other structures in thin-film transistor and array base palte.
Certainly, above-described just thin-film transistor drives a kind of concrete structure of layer 1, and thin-film transistor drives layer 1 also to can be other different structure, as long as it can Organic Light Emitting Diode 2 in each pixel cell of drive.Because thin-film transistor drives layer 1 can adopt multiple different form known, therefore be not described in detail at this.
Preferably, reflector 4 by any one metal in silver, aluminium, molybdenum, copper, titanium, chromium or in them alloy of any two kinds or more form, reflectivity is between 80 ~ 100%, and thickness exists
between.
Reflector 4 is provided with color film 3, and color film 3 is for being filtered through its light, and color film 3 color in each pixel cell is different, thus each pixel cell sends the light of different colours; Meanwhile, color film 3 upper surface is formed with concaveconvex structure or wave structure.
Why on color film 3, form concaveconvex structure or wave structure, be because color film 3 thickness is comparatively large, be enough to form said structure; And color film 3 is made up of resinous material usually, compares and be easy to form desired structure; In addition, color film 3 is the necessary structures on array base palte, therefore utilizes its formation said structure can avoid increasing other extra play.
Preferably, the thickness of color film 3 exists
between; Why the thickness range of color film 3 is comparatively large, being because color film 3 is arranged in micro-cavity structure, therefore controlling microcavity thickness by regulating color film 3 thickness, thus makes the micro-cavity structure in each pixel cell strengthen the light identical with its color film 3 color.
Color film 3 is provided with Organic Light Emitting Diode 2, and on the direction away from substrate 7, Organic Light Emitting Diode 2 comprises transparent the first electrode 21 (i.e. anode), luminescent layer 23, second electrode 22 (i.e. negative electrode) successively; Wherein, the second electrode 22 is half-reflection and half-transmission layer 6, and the first electrode 21 can be made up of the material of the transparent and electrically conductive such as tin indium oxide, indium zinc oxide.
Because each layer thickness in Organic Light Emitting Diode 2 is thinner and make by the material without mobility, therefore Organic Light Emitting Diode 2 can the self-assembling formation concaveconvex structure corresponding to the concaveconvex structure on color film 3 or wave structure or wave structure, thus the half-reflection and half-transmission layer 6 of Organic Light Emitting Diode 2 top side will inevitably be formed light can be made to form irreflexive concaveconvex structure or wave structure.
In the array base palte of the present embodiment, half-reflection and half-transmission layer 6 (the second electrode 22) and reflector 4 constitute micro-cavity structure, the light sent by luminescent layer 23 can penetrate from half-reflection and half-transmission layer 6 between the two after multiple reflections again, and strengthen because resonance effect makes the light of specific wavelength (light identical with color film 3 color of this pixel cell) obtain, to improve luminous efficiency.Simultaneously, concaveconvex structure on half-reflection and half-transmission layer 6 or wave structure can make the light generation diffuse reflection be mapped on it, thus make luminous efficiency obtain further raising, by analysis, the array base palte of the comparable no concave-convex structure of its luminous efficiency or wave structure improves about 50%.
Preferably, as the another kind of mode of the present embodiment, also the second electrode 22 can be arranged to transparent (as manufactured the second electrode 22 with transparent materials such as tin indium oxides), independently half-reflection and half-transmission layer 6 (obviously it also has concaveconvex structure or wave structure) is set on the second electrode 22 afterwards again; So also can form above-mentioned micro-cavity structure, just be not described in detail at this.
Obviously, although be the anode of Organic Light Emitting Diode 2 with the first electrode 21 in the present embodiment, the second electrode 22 is the negative electrode of Organic Light Emitting Diode 2; If but take the first electrode 21 as the negative electrode of Organic Light Emitting Diode 2, the second electrode 22 is the anode of Organic Light Emitting Diode 2 is also feasible.
Preferably, above-mentioned half-reflection and half-transmission layer 6 (the second electrode 22 or independent half-reflection and half-transmission layer 6) by any one metal in silver, aluminium, molybdenum, copper, titanium, chromium or in them alloy of any two kinds or more form, and transmitance is between 5 ~ 95%, thickness exists
between.
Preferably, luminescent layer 23 is the luminescent layer 23 for sending white light; It realizes the function emitted white light by multiple different mode.Preferred further, the luminescent layer sending white light comprises: the overlapping electroluminescent organic material layer glowed, the electroluminescent organic material layer of green light, the electroluminescent organic material layer of blue light-emitting; Or the electroluminescent organic material layer to be mixed into by the electroluminescent organic material of the electroluminescent organic material glowed, green light, the electroluminescent organic material of blue light-emitting.
Because the Technical comparing of white light OLED is ripe, white light is at the light that directly can become this color film 3 color after color film 3 simultaneously, therefore the most easily shows with the luminescent layer 23 emitted white light.Certainly, if luminescent layer 23 sends be coloured light is also feasible, as long as the color of each color film 3 of corresponding change, ensure finally can realize showing.
Preferably, the first electrode 21 drives the drain electrode of the driving thin-film transistor of layer 1 to be electrically connected (certain reflector 4 and thin-film transistor drive the passivation layer 14 of layer 1 also should have respective openings) by the via hole being arranged in color film 3 with thin-film transistor; Meanwhile, the pixel confining layers 91 (PDL, Pixel Defining Layer) of the insulation between the first electrode 21 and luminescent layer 23 is positioned in addition at this via hole place.
The Organic Light Emitting Diode 2 of the present embodiment and thin-film transistor drive between layer 1 and are provided with color film 3, therefore the first electrode 21 needs to drive layer 1 to be electrically connected by via hole and thin-film transistor.Simultaneously, because via hole place does not have color film 3 and reflector 4, therefore the luminescent layer 23 of this part is not answered luminous (this part is not Organic Light Emitting Diode 2 in other words), therefore needs the pixel confining layers 91 arranging insulation to block the electric current between the first electrode 21 of this position and luminescent layer 23.Certainly, as long as pixel confining layers 91 plays the object (limiting the viewing area of pixel cell in other words) stoping Organic Light Emitting Diode 2 luminescence, therefore it also can be other form, as can between the second electrode 22 and luminescent layer 23.
Certainly, the first electrode 21 also drives layer 1 to be electrically connected by other mode with thin-film transistor, such as, drive layer 1 to be connected by the position between each pixel cell and thin-film transistor.
Certainly, also can have other conventional structure in the array base palte of the present embodiment, such as, also can have pixel confining layers 91 etc. in the edge of each pixel cell.
Embodiment 3:
The present embodiment provides a kind of array base palte preparation method, and it comprises the following steps:
Substrate is formed and comprises the figure that thin-film transistor drives layer;
The substrate completing abovementioned steps comprises the figure in reflector;
The substrate completing abovementioned steps is formed the figure comprising color film, and form concaveconvex structure or wave structure on described color film;
The substrate completing abovementioned steps is formed the figure including OLED, and make described reflector relative with Organic Light Emitting Diode, described color film is between reflector and Organic Light Emitting Diode; Wherein, the electrode of the close substrate of described Organic Light Emitting Diode is transparent; The electrode away from substrate of described Organic Light Emitting Diode is half-reflection and half-transmission layer, or the electrode away from substrate of described Organic Light Emitting Diode transparent and its on also to form half-reflection and half-transmission layer; And described half-reflection and half-transmission layer has for making light produce irreflexive concaveconvex structure or wave structure.
Prepared by the array base palte preparation method of the present embodiment is above-mentioned array base palte, its color film is arranged in microcavity, as long as therefore control thickness and the adjustable microcavity thickness of each color film respectively when forming the color film of different colours, and need not increase new step, therefore its preparation technology is simple, cost is low; Again owing to having concaveconvex structure or wave structure in its microcavity, therefore its luminous efficiency is high.
Embodiment 4:
The present embodiment provides a kind of above-mentioned array base palte preparation method, and as shown in Fig. 5 to Fig. 8, it comprises the following steps:
S01, substrate 7 is formed thin-film transistor drive the figure of layer 1, obtain structure as shown in Figure 5.Wherein, thin-film transistor drives layer 1 to comprise multiple Rotating fields, and these Rotating fields can be formed successively in repeatedly patterning processes.Usual patterning processes comprises the complete rete first forming (by modes such as deposition, coating, sputterings) and be made up of certain material, removed the part in this complete rete afterwards by photoetching process (generally including the steps such as photoresist coating, exposure, development, etching, photoresist lift off), make remainder form required figure.Due to the technique that patterning processes is known, and the structure of thin-film transistor driving layer 1 can be same as the prior art, therefore be no longer described in detail its detailed process at this.
S02, form the figure in reflector 4 by patterning processes, obtain structure as shown in Figure 6.
S03, in each pixel, formed the color film 3 of required color respectively by typography or patterning processes, obtain the figure of color film 3, obtain structure as shown in Figure 7.Wherein, on color film 3, form concaveconvex structure or wave structure by the patterning processes of printing technology or use duotone mask plate, and on color film 3, formed the via hole being communicated with thin-film transistor driving layer 1 by patterning processes; The patterning processes of duotone mask plate is used mainly to refer to utilize duotone mask plate to control (comprising intermediate tone mask plate and grayscale mask plate) exposure of photoresist diverse location, part photoresist generating portion is exposed, in etch step afterwards, make the layer generating portion under it etch thus, thus produce surface relief structure or wave structure; Certainly, color film 3 also can be formed with photosensitive material, as long as the structure that in such patterning processes, directly exposure, development just can obtain as shown in Figure 7, without the need to the operation relevant to photoresist.Obviously, the said structure in color film 3 can realize in a patterning processes, also realizes respectively by repeatedly patterning processes.
S04, formed and include the figure of OLED 2, it comprises:
S041, formed the figure of the first transparent electrode 21 by patterning processes, the first electrode 21 drives layer 1 to be electrically connected by via hole and thin-film transistor.
S042, formed the figure of the pixel confining layers 91 of the insulation be at least positioned at above via hole by patterning processes, obtain structure as shown in Figure 8.
S043, formation luminescent layer 23.
Second electrode 22 of S044, formation half-reflection and half-transmission.Or this step also can be: first form the second transparent electrode 22, form half-reflection and half-transmission layer 6 afterwards on the second electrode 22.Obviously, the concaveconvex structure that on this half-reflection and half-transmission layer 6, meeting self-assembling formation is corresponding to the concaveconvex structure on color film 3 or wave structure or wave structure.
S05, formation confining bed 8, obtain array base palte as shown in Figure 3.Array base palte now also can be used as organic LED display device, or obtains organic LED display device after can carrying out the process such as encapsulation to it again.
Embodiment 5:
The present embodiment provides a kind of organic LED display device, and it comprises above-mentioned array base palte.This display unit can comprise: any product or parts with Presentation Function such as oled panel, mobile phone, panel computer, television set, display, notebook computer, DPF, navigator.
In the organic LED display device of the present embodiment, there is above-mentioned array base palte, therefore its preparation technology is simple, cost is low, luminous efficiency is high.
Certainly, also can have other conventional structure in the organic LED display device of the present embodiment, as with the closed substrate, power subsystem, display driver unit etc. of array base palte to box.
Be understandable that, the illustrative embodiments that above execution mode is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (13)
1. an array base palte, comprise multiple pixel cell be positioned on substrate, it is characterized in that, described pixel cell comprises:
Thin-film transistor drives layer;
Drive layer further from substrate than described thin-film transistor and the Organic Light Emitting Diode driving layer to drive by thin-film transistor, away from the direction of substrate, Organic Light Emitting Diode comprises the first transparent electrode, luminescent layer, the second electrode successively, wherein, described second electrode is half-reflection and half-transmission layer, or described second electrode is transparent and which is provided with half-reflection and half-transmission layer; And described half-reflection and half-transmission layer has for making light produce irreflexive concaveconvex structure or wave structure;
Reflector, it is positioned at described thin-film transistor and drives between layer and Organic Light Emitting Diode, and forms micro-cavity structure with described half-reflection and half-transmission layer;
Being arranged between described reflector and Organic Light Emitting Diode and being in the color film of micro-cavity structure, the face that described color film contacts with Organic Light Emitting Diode has concaveconvex structure or wave structure, and described color film thickness exists
between.
2. array base palte according to claim 1, is characterized in that,
Described luminescent layer is the luminescent layer for sending white light.
3. array base palte according to claim 2, is characterized in that, the described luminescent layer for sending white light comprises:
The overlapping electroluminescent organic material layer glowed, the electroluminescent organic material layer of green light, the electroluminescent organic material layer of blue light-emitting;
Or
The electroluminescent organic material layer be mixed into by the electroluminescent organic material of the electroluminescent organic material glowed, green light, the electroluminescent organic material of blue light-emitting.
4. array base palte as claimed in any of claims 1 to 3, is characterized in that,
Described thin-film transistor drives layer to comprise scan line, data wire, power voltage line, many cluster films transistor, and every cluster film transistor is for driving the Organic Light Emitting Diode in a pixel cell;
Wherein, every cluster film transistor comprises a switching thin-film transistor and a driving thin-film transistor, and the grid of described switching thin-film transistor connects scan line, source electrode connection data line, and drain electrode connects the grid driving thin-film transistor; Drive the source electrode of thin-film transistor to connect power voltage line, drain electrode is connected with the first electrode of OLED.
5. array base palte as claimed in any of claims 1 to 3, is characterized in that,
Be provided with via hole in described color film, described first electrode drives layer to be electrically connected by described via hole with thin-film transistor, and described via hole place is provided with the pixel confining layers of the insulation between the first electrode and luminescent layer.
6. array base palte as claimed in any of claims 1 to 3, is characterized in that,
Described reflector by any one metal in silver, aluminium, molybdenum, copper, titanium, chromium or in them alloy of any two kinds or more form, and reflectivity is between 80 ~ 100%, and thickness exists
between.
7. array base palte as claimed in any of claims 1 to 3, is characterized in that,
Described half-reflection and half-transmission layer by any one metal in silver, aluminium, molybdenum, copper, titanium, chromium or in them alloy of any two kinds or more form, and transmitance is between 5 ~ 95%, and thickness exists
between.
8. array base palte as claimed in any of claims 1 to 3, is characterized in that, described color film comprises:
Red color film, green tint film, blue color film;
Or
Red color film, green tint film, blue color film, white color film;
Or
Red color film, green tint film, blue color film, yellow color film.
9. array base palte as claimed in any of claims 1 to 3, is characterized in that,
Described first electrode is the negative electrode of Organic Light Emitting Diode, and described second electrode is the anode of Organic Light Emitting Diode;
Or
Described first electrode is the anode of Organic Light Emitting Diode, and described second electrode is the negative electrode of Organic Light Emitting Diode.
10. an array base palte preparation method, is characterized in that, comprising:
Substrate is formed and comprises the figure that thin-film transistor drives layer;
The substrate completing abovementioned steps comprises the figure in reflector;
The substrate completing abovementioned steps is formed the figure comprising color film, and form concaveconvex structure or wave structure on described color film, described color film thickness exists
between;
The substrate completing abovementioned steps is formed the figure including OLED, and make described reflector relative with Organic Light Emitting Diode, described color film is between reflector and Organic Light Emitting Diode; Wherein, the electrode of the close substrate of described Organic Light Emitting Diode is transparent; The electrode away from substrate of described Organic Light Emitting Diode is half-reflection and half-transmission layer, or the electrode away from substrate of described Organic Light Emitting Diode transparent and its on also to form half-reflection and half-transmission layer; And described half-reflection and half-transmission layer has for making light produce irreflexive concaveconvex structure or wave structure.
11. array base palte preparation methods according to claim 10, is characterized in that, described color film form concaveconvex structure or wave structure comprises:
On described color film, concaveconvex structure or wave structure is formed by the patterning processes of printing technology or use duotone mask plate.
12. array base palte preparation methods according to claim 10, is characterized in that, the figure of described color film comprises and is communicated with the via hole that thin-film transistor drives layer; And
The described figure including OLED that formed on substrate comprises:
Formed the figure of the first transparent electrode by patterning processes, described first electrode drives layer to be electrically connected by described via hole with thin-film transistor;
The figure of the pixel confining layers of the insulation be at least positioned at above described via hole is formed by patterning processes;
The substrate completing abovementioned steps forms luminescent layer;
This step be following any one in both: the second electrode forming half-reflection and half-transmission on the substrate completing abovementioned steps; Or, the substrate completing abovementioned steps is formed the second transparent electrode, and forms half-reflection and half-transmission layer on the second electrode.
13. 1 kinds of organic LED display devices, is characterized in that, comprising:
Array base palte in claim 1 to 9 described in any one.
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| CN103943661A (en) | 2014-04-15 | 2014-07-23 | 京东方科技集团股份有限公司 | Display device and manufacturing method thereof |
| CN104795430A (en) * | 2015-04-14 | 2015-07-22 | 京东方科技集团股份有限公司 | Organic light emitting display device and manufacturing method thereof |
| US10008697B2 (en) * | 2015-08-31 | 2018-06-26 | Lg Display Co., Ltd. | Organic light emitting diode display device |
| CN107706207B (en) * | 2016-08-09 | 2021-05-07 | 颜崇纹 | Organic light emitting diode display |
| CN106646711A (en) * | 2016-09-19 | 2017-05-10 | 深圳市核高基科技有限公司 | Micro display device and method of forming micro structure on surface of color filter film |
| CN107369782B (en) * | 2017-09-05 | 2023-12-01 | 京东方科技集团股份有限公司 | Substrate, manufacturing method thereof and display device |
| CN111164780B (en) * | 2017-09-28 | 2022-12-09 | 苹果公司 | Organic light emitting diode display, organic light emitting diode pixel and display |
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