A kind of organic light-emitting display deviceTechnical field
The present invention relates to display field more particularly to a kind of organic light-emitting display devices.
Background technique
Organic light-emitting display device, i.e. Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED)Display device, also known as Organic Electricity laser display (Organic Electroluminescence Display, OELD) device.Because having the characteristics such as frivolous, power saving, has an incomparable advantage of many liquid crystal displays, therefore it is also always by the industryPersonage has an optimistic view of.OLED display is different from traditional liquid crystal display display mode, is not necessarily to backlight, and use is very thinCoating of organic material is set on glass substrate, and when a current passes through, these organic materials will shine.And OLED is shownScreen can be made lighter and thinner, and visible angle is bigger, and can save significantly on electric energy.
There are two types of the colorization of organic light-emitting display device is shown, one is rgb pixels independence luminescence method, one isWhite light variegates optical filter method.Rgb pixels independence luminescence method is to be individually formed pixel unit using luminescent material to shine,It is that vapor deposition prepares the luminescent layer of red, green, blue pixel respectively using precision metallic shadow mask, generates true color, makes three colour organic luminousDisplay device independently shines and constitutes a pixel.Precision metallic shadow mask techniques are for rgb pixels independence luminescence method to Guan ChongIt wants, the vapor deposition penetrating region of precision metallic shadow mask respectively corresponds the luminous zone of red, green, blue pixel, for having for ultrahigh resolutionMachine luminous display unit, because the size of pixel unit is smaller and smaller, the precision of the vapor deposition penetrating region of precision metallic shadow mask is difficult toReach required fineness, cannot achieve.White light variegates optical filter method, prepares the OLED device to emit white light first, thenThree primary colours are obtained by color filter film, recombinant three primary colours realize colored display.The key of this technology is to obtain efficientThe white light of rate and high-purity.Its manufacturing process does not need precision metallic shadow mask techniques, and mature color filter film system can be usedMake technology, but makes to be up to half or higher through light loss caused by color filter film using this technology.
Summary of the invention
The present invention provides a kind of organic light-emitting display device, including multiple OLED display units, the OLED display unitIncluding anode, cathode and the organic luminous layer being set between the anode and cathode, the organic luminous layer is the multipleThe common layer of OLED display unit；The multiple OLED display unit includes a variety of OLED display units, and every kind of OLED is aobviousShow and be provided with the different optical adjustment layer of thickness in unit, and the color of the light of every kind of OLED display unit transmitting is notTogether, the light emission side of at least one of the multiple OLED display unit OLED display unit is provided with neutral-density filter.
The present invention also provides a kind of organic light-emitting display devices, OLED display unit, transmitting green light including emitting feux rougesOLED display unit and transmitting blue light OLED display unit, each OLED display unit includes anode, cathode and setsThe organic luminous layer being placed between the anode and cathode, the organic luminous layer are the public of the multiple OLED display unitLayer；The OLED display unit of the transmitting feux rouges, emits in the OLED display unit of blue light the OLED display unit for emitting green lightIt is respectively arranged with the different optical adjustment layer of thickness；The full width at half maximum (FWHM) of the light of the OLED display unit transmitting of the transmitting blue light is smallIn being equal to 25nm, light emission side is provided with neutral-density filter；The light of the OLED display unit transmitting of the transmitting green lightFull width at half maximum (FWHM) is greater than 25nm, and light emission side is provided with green color filter；The light of the OLED display unit transmitting of the transmitting feux rougesFull width at half maximum (FWHM) be greater than 25nm, light emission side is provided with Red lightscreening plate.
Organic light-emitting display device provided by the invention is provided as the organic luminous layer of each display unit common layer, phaseThan reducing the film forming difficulty of organic luminous layer in the thin film-forming method for using precision metallic shadow mask in the prior art, it is suitable for high scoreThe organic light-emitting display device of resolution, small-sized pixel, such as silicon-base miniature organic light-emitting display device.It is each aobvious in the present inventionShow that the public organic luminous layer transmitting white light of unit, each display unit are proposed red, green therein, blue by micro-cavity structureIt takes out, the display unit of 25nm is less than or equal to for the full width at half maximum (FWHM) of emission spectrum, neutral-density filter of arranging in pairs or groups, for hairThe full width at half maximum (FWHM) for penetrating spectrum is greater than the display unit of 25nm, colored filter of arranging in pairs or groups, it is ensured that the height of organic light-emitting display deviceColour gamut degree improves brightness, reduces power consumption, while inhibiting halation bad.In addition, organic light-emitting display device provided by the invention,It can be singlestack formula organic light-emitting display device, be also possible to Tandem formula organic light-emitting display device.
Detailed description of the invention
Fig. 1 is the schematic diagram for the organic light-emitting display device that the embodiment of the present invention one provides；
Fig. 2 is the emission spectrum schematic diagram for emitting the OLED display unit of blue light；
Fig. 3 is that organic light-emitting display device whole OLED display unit is respectively provided with colored filter and at least one OLED is aobviousShow the contrast schematic diagram of unit setting neutral-density filter；
Fig. 4 is that blue color filter penetrates spectral schematic；
Fig. 5 is the transmitance schematic diagram of neutral-density filter；
Fig. 6 is the emissioning light spectrum figure for emitting the OLED display unit 10G of green light；
Fig. 7 is that organic light-emitting display device whole OLED display unit is respectively provided with colored filter and emits the OLED of green lightThe parameter comparison schematic diagram of display unit setting neutral-density filter；
Fig. 8 is the emissioning light spectrum figure for emitting the OLED display unit of feux rouges；
Fig. 9 is the schematic diagram of organic light-emitting display device provided by Embodiment 2 of the present invention.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapesFormula is implemented, and is not understood as limited to example set forth herein；On the contrary, thesing embodiments are provided so that the present invention will moreFully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.
In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable mannerIn example.In the following description, many details are provided to provide and fully understand to the embodiment of the present invention.However,It will be appreciated by persons skilled in the art that technical solution of the present invention can be practiced without one or more in specific detail,Or it can be using other methods, constituent element, device, step etc..In other cases, it is not shown in detail or describes known sideMethod, device, realization or operation are to avoid fuzzy each aspect of the present invention.
Figure shown in the drawings is merely illustrative, it is not necessary to including all content and operation/step, norIt must be executed by described sequence.For example, some operation/steps can also decompose, and some operation/steps can merge,Part merges or adjustment executes step, therefore the sequence actually executed is possible to change according to the actual situation.
Embodiment one
Fig. 1 is the schematic diagram for the organic light-emitting display device that the embodiment of the present invention one provides, referring to FIG. 1, organic light emissionDisplay device 100 includes multiple OLED display units 10, and each OLED display unit 10 includes the anode being set on substrate 1112, the optical adjustment layer 13 that is set on anode 12, the organic luminous layer 14 being set in optical adjustment layer 13, be set to it is organicCathode layer 15 on luminescent layer 14.Wherein, organic luminous layer 14 is the common layer of multiple OLED display units, and anode 12 is reflectionMetal layer, cathode layer 15 are half-reflection and half-transmission metal, emit the optical adjustment layer 13 of the OLED display unit 10 of the light of different coloursThickness it is different.Film layer 19 can also be arranged in 15 upper layer of cathode layer, play the role of optics and adjust or planarize.
The light that organic luminous layer 14 issues is white light, is emitted in the OLED display unit 10 of the light of different colours by micro-Resonant cavity effect extracts colourama from white light.Specifically, multiple OLED display units 10 include that the OLED of transmitting feux rouges is shownUnit 10R, the OLED display unit 10G for emitting green light and the OLED display unit 10B for emitting blue light.
The characteristics of luminescence of microresonator can be determined by the optical length of microresonator, from the light of the sending of organic luminous layer 14Line interferes with each other between reflection anode 12 and translucent cathode layer 15, causes constructive or destructive interference.DifferentThe different optical adjustment layer of thickness, shape between reflection anode 12 and translucent cathode layer 15 are provided in OLED display unitAt different optical path lengths, therefore constructive or destructive interference can be carried out to the light of different colours, and then will be differentThe light of color proposes.
The light emission side of at least one of above-mentioned a variety of OLED display units OLED display unit is provided with neutral densityOptical filter, and the full width at half maximum (FWHM) of light that at least one OLED display unit is emitted is less than or equal to 25nm.Full width at half maximum (FWHM) is alsoClaim half width, half-peak breadth, half peak breadth, peak width or peak width at halfheight, it refers to the peak width at chromatography peak height half, i.e.,The straight line of peak base is parallel to by the midpoint of peak height, this straight line intersects the distance between two o'clock with peak two sides.
Specifically, in the present embodiment one, the full width at half maximum (FWHM) for emitting the blue light of the OLED display unit 10B transmitting of blue light existsLess than or equal to 25nm, neutral-density filter 163 is provided on the OLED display unit 10B of transmitting blue light.With reference to Fig. 2, Fig. 2More specifically emit the OLED display unit 10B of blue light to emit the emission spectrum schematic diagram of the OLED display unit of blue lightFor the main peak (prominent peak) of the blue light of transmitting in 455nm, full width at half maximum (FWHM) (FWHM) is 20nm.Full width at half maximum (FWHM) is narrower, saysThe light of bright transmitting is purer, and the color of display is also purer, that is, in the present embodiment one, emits the OLED display unit 10B hair of blue lightThe blue light penetrated has been the very high blue light of purity, and the light of other colors of doping is considerably less.
The full width at half maximum (FWHM) for the light that the OLED display unit of the blue light of organic light-emitting display device issues or the purity of light andThe material and micro-cavity structure of organic luminous layer are related, strong by selecting suitable light emitting layer material, then by adjusting microcavityDegree reinforces the interference to blue light, obtains the high blue light of excitation purity, specifically, obtains the blue light that full width at half maximum (FWHM) is 20nm.
Fig. 2 and Fig. 3, Fig. 4, Fig. 5 are please referred to, Fig. 3 is that organic light-emitting display device whole OLED display unit is respectively provided with coloured silkThe contrast schematic diagram of colo(u)r filter and at least one OLED display unit setting neutral-density filter, Fig. 4 is blue color filterThrough spectral schematic, Fig. 5 is the transmitance schematic diagram of neutral-density filter.
As shown in figure 3, transmitting blue light OLED display unit 10B in, when collocation blue color filter (CF) with a thickness ofWhen 3344nm, i.e., in the above-mentioned blue color filter of light emission side collocation of the OLED display unit 10B of transmitting blue light, chromaticity coordinates XB, YBFor (0.146,0.039), transmitance 51.68%.Meanwhile in the light emission side collocation of the OLED display unit 10R of transmitting feux rougesRed lightscreening plate (CF) and thickness 5596nm, chromaticity coordinates XR, YRFor (0.663,0.325), transmitance 78.69%.It is sending outPenetrate light emission side collocation green color filter (CF) of the OLED display unit 10G of green light and thickness 6855nm, chromaticity coordinates XG, YGFor (0.294,0.671), transmitance 78.97%.The structure of above-mentioned color OLED display unit collocation colored filterUnder, NTSC (National Television Standards Committee, National Television System Committee) colour gamut is90.07%.From the point of view of above data, in table shown in Fig. 3, the colour gamut degree of the organic light-emitting display device marked as No.1 is veryHeight, the bright in luster of display are enriched, meanwhile, emit the OLED display unit 10G of green light and the OLED display unit of transmitting feux rouges10R is after colored filter of arranging in pairs or groups, and transmitance is all 78% or more, but the OLED display unit 10B for emitting blue light is takingAfter colored filter, transmitance only has 51.68%, sacrifices the transmitance of nearly half.
The schematic diagram through spectrum of the blue color filter of Fig. 4 is please referred to, abscissa is wavelength, unit nm, ordinateFor transmitance.The transmitance of blue color filter is related with its used material and making technology, the preparation method of optical filterThere are decoration method, pigment dispersion method, print process, ink-jet method etc., the materials such as dyestuff, pigment, resin, solvent, additive can be used, oftenPlanting material has certain absorption and transmission to light, eventually forms transmission spectrum as shown in the figure.As shown, blue color filterIt is slightly larger than 80% in the transmitance of wavelength 455nm or so, and the thickness of blue color filter only has 3344nm, is less than red filterThe thickness of piece and green color filter, the thickness of blue color filter have been difficult to be even lower, if the thickness of blue color filter increasesGreatly, bigger to the negatively influencing of the transmitance of the OLED display unit 10B of transmitting blue light.Therefore blue color filter is to transmitting blue lightOLED display unit 10B issue light blocking it is more, reduce transmitting blue light OLED display unit 10B transmitance,Increase the power consumption of the OLED display unit 10B of transmitting blue light.Meanwhile because the OLED display unit 10B of transmitting blue light emitsBlue light excitation purity it is higher, collocation blue color filter blue light is not obvious in the effect for being filtered removal of impurities.
With reference to Fig. 3, in table shown in Fig. 3, organic light-emitting display device marked as No.2 is aobvious in the OLED of transmitting green lightIn the case where showing that unit 10G and OLED display unit 10R and the colored filter collocation for emitting feux rouges are constant, selection and blue filterThe light emission side collocation of the OLED display unit 10B of the neutral-density filter and transmitting blue light of mating plate same thickness, specifically,Transmitance is selected to arrange in pairs or groups for 100% neutral-density filter and the OLED display unit 10B of transmitting blue light.Emit blue lightThe chromaticity coordinates X of OLED display unit 10BB, YBFor (0.15,0.06), transmitance 100%, the NTSC color of OLED displayDomain is 87.12%.It is compared with the OLED display of collocation blue color filter, colour gamut degree reduced by only less than 3%, but emitThe transmitance of the OLED display unit 10B of blue light increases nearly 50%, and the OLED that can significantly improve transmitting blue light shows list 10BBrightness and reduce power consumption.
Referring to FIG. 5, being the transmitance schematic diagram of neutral-density filter, neutral-density filter, which can be set, is52% to 100%, higher than blue color filter to the transmitance of blue light, it can be improved the OLED display unit 10B's of transmitting blue lightBrightness simultaneously reduces power consumption.In addition, the OLED display unit 10B that transmitting blue light can be absorbed in neutral-density filter projects veiling glare,Reduce halation phenomenon, specifically, when have veiling glare transmitting blue light OLED display unit 10B anode and cathode between reflect,It if projecting display unit, can show variegated, cause halation show bad, the transmitance that neutral-density filter is arranged is 52%To 100%, the veiling glare in the OLED display unit 10B of transmitting blue light can be absorbed, improve the OLED display unit of transmitting blue lightThe display excitation purity of 10B.
The above specific embodiment is to be less than or equal to 25nm as full width at half maximum (FWHM) to emit the OLED display unit 10B of blue lightIt is illustrated for situation, but the present invention is not limited thereto, is closed if the OLED display unit for emitting other colors is selectedSuitable material and micro-cavity structure cooperation, the full width at half maximum (FWHM) of emission spectrum are less than or equal to 25nm, i.e. the color excitation purity of its transmittingHeight can also improve transmitance using neutral-density filter and reduce power consumption without using colored filter.
Fig. 6 and Fig. 7 are please referred to, Fig. 6 is the emissioning light spectrum figure for emitting the OLED display unit 10G of green light, and Fig. 7 is organicLuminous display unit whole OLED display unit is respectively provided with colored filter (CF) and the OLED display unit 10G of transmitting green light is setSet the parameter comparison schematic diagram of neutral-density filter (ND).Emit the OLED display unit 10G of green light according to the organic of selectionThe full width at half maximum (FWHM) of luminescent material and micro-cavity structure, emission spectrum is greater than 25nm, specifically, in 45nm or so, that is to say, that phaseThan the emission spectrum of the OLED display unit 10B in transmitting blue light shown in Fig. 2, the emission spectrum full width at half maximum (FWHM) of green light is larger,The purity of its green is lower.When emitting the light emission side of OLED display unit 10G of green light collocation green color filter, color is satMark XG, YGFor (0.294,0.671), transmitance 78.97%, meanwhile, emit the OLED display unit 10B of blue light and emits redAlso all collocation colored filter, the NTSC color gamut of entire organic light-emitting display device are the OLED display unit 10R of light90.07%.When the neutral density that the light emission side collocation transmitance of the OLED display unit 10G in transmitting green light is 100% filtersWhen piece, chromaticity coordinates XG, YGFor (0.319,0.631), transmitance 100%, meanwhile, emit the OLED display unit of blue light10B and emit feux rouges OLED display unit 10R also all arrange in pairs or groups colored filter, the NTSC of entire organic light-emitting display deviceColour gamut is only 81.19%, is 90.07% compared to NTSC color gamut, has dropped close to 10%, display color it is ineffective.CauseThis, in organic light-emitting display device provided by the invention, hair of the full width at half maximum (FWHM) greater than 25nm that emission spectrum is arranged filtersOLED display unit light emission side be arranged green color filter 162, to improve colour gamut degree.
Referring to FIG. 8, the emissioning light spectrum figure of the OLED display unit 10R for transmitting feux rouges, in 418nm to 475nmThere is a miscellaneous peak in range, the full width at half maximum (FWHM) of the main peak of 570nm to 684nm is relatively larger than 25nm, specially 40nm or so, therefore sameOn, Red lightscreening plate 161 is set in the light emission side of the OLED display unit 10R of transmitting feux rouges, to improve colour gamut degree.
Organic light-emitting display device provided by the invention is provided as the organic luminous layer of each display unit common layer, phaseThan reducing the film forming difficulty of organic luminous layer in the thin film-forming method for using precision metallic shadow mask in the prior art, it is suitable for high scoreThe organic light-emitting display device of resolution, small pixel size.In the present invention, the public organic luminous layer transmitting of each display unit is whiteLight, each display unit is extracted red, green therein, blue by micro-cavity structure, complete for the half-peak of emission spectrumWidth is less than or equal to the display unit of 25nm, neutral-density filter of arranging in pairs or groups, and is greater than 25nm's for the full width at half maximum (FWHM) of emission spectrumDisplay unit, colored filter of arranging in pairs or groups, it is ensured that the colour gamut degree of organic light-emitting display device improves brightness, reduces power consumption, simultaneouslyInhibit halation bad.
Embodiment two
Referring to FIG. 9, being the schematic diagram of organic light-emitting display device provided by Embodiment 2 of the present invention, organic light emitting displayDevice 200 includes multiple OLED display units 20, and each OLED display unit 20 includes the anode 22 being set on substrate 21, setsThe optical adjustment layer 23 that is placed on anode 22, is set at the first organic light-emitting units 24 being set in optical adjustment layer 23Middle layer 25 on one organic light-emitting units 24 is set to the second organic light-emitting units 26 in middle layer 25, and it is organic to be set to secondCathode layer 27 on luminescence unit 26, can also be arranged film layer 29 on cathode layer 27, take out for planarizing or improving lightThe effect come.Wherein, the luminescent layer in the first organic light-emitting units 24 and the second organic light-emitting units 26 is that multiple OLED are shownThe common layer of unit, anode 22 are reflective metal layer, and cathode layer 27 is half-reflection and half-transmission metal, emit the OLED of the light of different coloursThe thickness of the optical adjustment layer 23 of display unit 20 is different.
In structure shown in Fig. 9, the light clouding that concatenated two organic light-emitting units issue is combined into white light, emits different faceDifferent micro-cavity structures is set in the OLED display unit 20 of the light of color, the light extraction of different colours is come out.Specifically, multipleOLED display unit 20 includes the OLED display unit 20B of transmitting blue light, the OLED display unit 20R for emitting feux rouges and transmittingThe thickness of the OLED display unit 20G of green light, the optical adjustment layer 23 of above-mentioned three kinds of OLED display units 20 are different, to be formedDifferent optical lengths extracts the light of different colours.
In the organic light-emitting display device shown in scheming, it is less than or equal to the display unit of 25nm in the full width at half maximum (FWHM) of emission spectrumLight emission side be provided with neutral-density filter, taken in the light emission side of display unit of the full width at half maximum (FWHM) of emission spectrum greater than 25nmWith colored filter, for degree of guarantee, brightness, reduction power consumption are improved, while inhibiting halation bad.Specifically, according to transmittingThe value of the full width at half maximum (FWHM) of light, 281,282,283 in Fig. 9 shown in structure can be colored filter, be also possible to neutral density filterMating plate.
Organic light-emitting display device in embodiment one is single stack (single layer stack) formula organic light emitting display dressIt sets, the organic light-emitting display device that embodiment two provides is Tandem (series connection) formula organic light-emitting display device, two organic hairsMiddle layer 25 between light unit is charge generation layer, can be single layer structure, is also possible to multilayered structure, for example includes NType charge generation layer and p-type charge generation layer.In addition, diagram is exemplary to show the structure of two organic luminescence display units,In other embodiments, it can also connect for more than two multiple organic luminescence display units, adjacent organic hairCharge generation layer is provided between light display unit.Compared to organic light-emitting display device shown in embodiment one, cathode is only leaned onFor combining with the electrons and holes that anode generates, electricity that Tandem formula organic light-emitting display device can be generated by cathode 27Son and anode 22 generate the hole in hole and charge generation layer 25 and electronically form exciton, while multilayered structure generates chargeThe remaining carrier of layer 25 continues and the carrier of next charge generation layer forms exciton, and therefore, Tandem formula organic light emission is aobviousThe exciton number that showing device generates device greatly increases, and organic light emitting display of the luminous efficiency much higher than embodiment one fillsIt sets, and service life length, device stability are high.
Optionally, organic light-emitting display device provided by the invention can be silicon-based organic light-emitting microform display device, holdThe essentially monocrystalline silicon substrate of multiple organic luminescence display units is carried, manufacture has CMOS driving circuit on monocrystalline silicon substrate.SeparatelyOutside, the apparent size of silicon-based organic light-emitting microform display device is very small, and display screen diagonal size is no more than 1 inch, needsIt can just see that shown image information, pixel only have 7 μm~20 μm, use precision metallic by some optical amplification systemsShadow mask is difficult to carry out evaporation film-forming to organic luminous layer, is very suitable to the mode of public organic luminous layer provided by the invention.
Organic light-emitting display device provided by the invention is provided as the organic luminous layer of each display unit common layer, phaseThan reducing the film forming difficulty of organic luminous layer in the thin film-forming method for using precision metallic shadow mask in the prior art, it is suitable for high scoreThe organic light-emitting display device of resolution, small pixel size, such as silicon-base miniature organic light-emitting display device.It is each aobvious in the present inventionShow that the public organic luminous layer transmitting white light of unit, each display unit are proposed red, green therein, blue by micro-cavity structureIt takes out, the display unit of 25nm is less than or equal to for the full width at half maximum (FWHM) of emission spectrum, neutral-density filter of arranging in pairs or groups, for hairThe full width at half maximum (FWHM) for penetrating spectrum is greater than the display unit of 25nm, colored filter of arranging in pairs or groups, it is ensured that the color of organic light-emitting display deviceDomain degree improves brightness, reduces power consumption, while inhibiting halation bad.In addition, organic light-emitting display device provided by the invention, it canTo be single stack formula organic light-emitting display device, it is also possible to Tandem formula organic light-emitting display device.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art thatThe invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,It readjusts, be combined with each other and substitutes without departing from protection scope of the present invention.Therefore, although by above embodiments to thisInvention is described in further detail, but the present invention is not limited to the above embodiments only, is not departing from present inventive conceptIn the case of, it can also include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.