CN109802050A - Display base plate and display device - Google Patents
Display base plate and display device Download PDFInfo
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- CN109802050A CN109802050A CN201910048983.9A CN201910048983A CN109802050A CN 109802050 A CN109802050 A CN 109802050A CN 201910048983 A CN201910048983 A CN 201910048983A CN 109802050 A CN109802050 A CN 109802050A
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Abstract
The present invention provides a kind of display base plate and display device, wherein display base plate includes multiple pixel units, each pixel unit includes reflective anode layer, semi-transparent cathode layer and the organic luminous layer between the anode layer and the cathode layer, micro-cavity structure is formed between the cathode layer and the anode layer, the length of the corresponding micro-cavity structure of the pixel unit of different colours is different.In this way, the brightness of the light of different colours can be promoted in display base plate by the micro-cavity structure in the pixel unit of corresponding color, microcavity effect in display base plate can make different monochromatic light realize resonant check, effectively improve the luminous efficiency and colour gamut of display device.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of display base plate and display devices.
Background technique
Existing display device, especially micro-display are when being applied to the closely eye display field such as augmented reality, brightness
The requirement being unable to satisfy under equal application scenarios outdoors.Strong microcavity effect is capable of the bright of effective lifting parts light splitting in white light parts
Degree.But correspondingly, microcavity effect can also weaken the intensity of the light of its all band, cause the luminous efficiency of micro-display poor.
As it can be seen that a kind of improvement micro-cavity structure is needed, to realize the luminescence enhancement of display device.
Summary of the invention
The embodiment of the present invention provides a kind of display base plate and display device, to improve micro-cavity structure, realizes luminescence enhancement.
In order to achieve the above object, concrete scheme provided in an embodiment of the present invention is as follows:
In a first aspect, the embodiment of the invention provides a kind of display base plate, including multiple pixel units, each pixel unit
Including reflective anode layer, semi-transparent cathode layer and the organic luminous layer between the anode layer and the cathode layer,
Micro-cavity structure, the length of the corresponding micro-cavity structure of the pixel unit of different colours are formed between the cathode layer and the anode layer
It is different.
Optionally, the length of the micro-cavity structure of the pixel unit is equal to the half of the corresponding light of color of the pixel unit
The integral multiple of wavelength.
Optionally, the pixel unit includes three kinds of pixel units of red, green, blue.
Optionally, the anode layer includes the first transparency conducting layer, the second transparency conducting layer and is located at described first transparent
Distributed Bragg DBR reflecting mirror between conductive layer and second transparency conducting layer, the DBR reflecting mirror and the cathode
The distance between layer is equal to the length of micro-cavity structure.
Optionally, the cathode layer of the pixel unit of different colours and the thickness of the organic luminous layer are equal, described
The thickness of anode layer is different.
Optionally, first transparency conducting layer is between the DBR reflecting mirror and the organic luminous layer；
The thickness of first transparency conducting layer of the pixel unit of different colours is identical, the thickness of the DBR reflecting mirror
It is different.
Optionally, the thickness of the DBR reflecting mirror of the pixel unit of different colours is equal, the cathode layer and described has
The thickness of machine luminescent layer is different.
Optionally, the cathode layer is the semi-transparent reflective coating of magnesium silver alloy.
Optionally, the DBR reflecting mirror includes alternately stacked silicon dioxide layer and titanium dioxide layer.
Second aspect, the embodiment of the invention provides a kind of display devices, applied to described in any one of first aspect
Display base plate.
In the embodiment of the present invention, display base plate includes multiple pixel units, the cathode layer and anode layer of each pixel unit
Between form micro-cavity structure, and the length of the corresponding micro-cavity structure of the pixel unit that different colours are arranged is different.In this way, different
The brightness of the light of color can be promoted in display base plate by the micro-cavity structure in the pixel unit of corresponding color, display base plate
Interior microcavity effect can make different monochromatic light realize resonant check, effectively improve the luminous efficiency and color of display device
Domain.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of display base plate provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another display base plate provided in an embodiment of the present invention；
Fig. 3 is the reflectivity changes curve synoptic diagram of the DBR reflecting mirror of display base plate；
Fig. 4 is the structural schematic diagram of another display base plate provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the DBR reflecting mirror in display base plate provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is a kind of structural schematic diagram of display base plate provided in an embodiment of the present invention.As shown in Figure 1, this
The display base plate of embodiment, including multiple pixel units 100, each pixel unit 100 include reflective anode layer 140, semi-transparent
The cathode layer 120 of light and the organic luminous layer 130 between the anode layer 140 and the cathode layer 120, the cathode layer
Micro-cavity structure, the length of the corresponding micro-cavity structure of pixel unit 100 of different colours are formed between 120 and the anode layer 140
It is different.
In the embodiment of the present invention, display base plate includes multiple pixel units 100, and the color of multiple pixel units 100 is different,
The setting of multiple intervals of pixel unit 100.Optionally, the pixel unit 100 includes red (Red, abbreviation R), green (Green, abbreviation
G), blue (Blue, abbreviation B) three kinds of pixel units.RGB is the base color of display field, by tri- kinds of Color Channels of R, G, B
Variation and being overlapped mutually to obtain miscellaneous color between them.
Specifically, as shown in Figure 1, pixel unit 100 includes anode layer 140, organic luminous layer 130 and the yin set gradually
Pole layer 120, anode layer 140 are reflective structure, and cathode layer 120 is semi-transparent photo structure, semi-transparent cathode layer 120 and reflective sun
Optical micro-cavity structure is formed between pole layer 140.Micro-cavity structure refers to size in the optics of micron dimension or sub-micrometer scale
Light is limited in by resonant cavity using effects such as reflection, total reflection, scattering or diffraction on the discontinuous interface of refractive index
The region of one very little.Micro-cavity structure can have spectrum narrowing, light intensity enhancing to organic electroluminescent LED and adjust transmitting
Excitation purity, luminous efficiency of display device etc. can be improved in the effects of spike is long.In addition, as shown in Fig. 2, on cathode layer 120 also
It is provided with encapsulated layer TFE layer 110, for encapsulating the pixel unit 100.
The color of multiple pixel units 100 of display base plate is different, the corresponding microcavity knot of pixel unit 100 of different colours
The length of structure is also different.In this way, micro-cavity structure in each pixel unit 100 can for the light of corresponding color or wave band into
Row enhancing, multiple pixel units 100 may make different monochromatic resonant checks.
In the embodiment of the present invention, display base plate includes multiple pixel units, the cathode layer and anode layer of each pixel unit
Between form micro-cavity structure, and the length of the corresponding micro-cavity structure of the pixel unit that different colours are arranged is different.In this way, different
The brightness of the light of color can be promoted in display base plate by the micro-cavity structure in the pixel unit of corresponding color, display base plate
Interior microcavity effect can make different monochromatic resonant checks, guarantee the excitation purity that do not share the same light, and effectively improve display dress
The luminous efficiency set.
In a specific embodiment, the length of the micro-cavity structure of the pixel unit 100 is equal to the pixel unit
The integral multiple of the half-wavelength of the corresponding light of 100 color.
In display base plate, monochromatic light resonates in the micro-cavity structure of pixel unit 100, monochromatic wavelength and pixel unit
The mode of resonance of 100 micro-cavity structure needs to meet F-P equation:
Wherein, L is the length of micro-cavity structure,For the phase shift at 120 interface of organic luminous layer 130 and the cathode layer, niWith
diIt is the refractive index and thickness of the organic luminous layer 130 respectively, m is the series for emitting mould.As shown from the above formula, aobvious at this
Show in substrate, if pixel unit 100 will enhance the photoresonance that wavelength is λ, the micro-cavity structure of pixel unit 100 needs full
Foot: the length of micro-cavity structure is equal to the integral multiple of half-wavelength.In addition, by the anode layer 140 for adjusting pixel unit 100 or having
The thickness of machine luminescent layer 130, i.e., the length of adjustable micro-cavity structure, so that the length of micro-cavity structure is the half of the light of corresponding color
The integral multiple of wavelength.
For example, red light wavelength is 620 nanometers to 760 nanometers, the series m for emitting mould takes 1 or 2, corresponding micro-cavity structure
Length is 310 nanometers to 760 nanometers；Blue light wavelength is 400 nanometers to 450 nanometers, and the series m for emitting mould takes 1 or 2, accordingly
The length of micro-cavity structure is 200 nanometers to 450 nanometers；455 nanometers to 492 nanometers of green wavelength, emit mould series m take 1 or
Person 2, and the length of corresponding micro-cavity structure is 227 nanometers to 492 nanometers.
In order to be handled differently the light of different colours, the series m for emitting mould can take different value, so that the pixel of different colours
The length of the micro-cavity structure of unit 100 is different, to make especially processing for the monochromatic light of certain wave band.It, can be with such as shown in Fig. 2
The micro-cavity structure for designing blue respective pixel unit 100 is close absolutely in the reflectivity of blue wave band, and in its all band
Reflectivity it is very low, i.e. micro-cavity structure is very weak to the resonance effect of its all band, and very strong to blue light resonance effect.
In present embodiment, the length of the corresponding micro-cavity structure of pixel unit by adjusting each color, so that microcavity
The length of structure is the integral multiple of corresponding monochromatic half-wavelength, so that the monochromatic light can add in micro-cavity structure internal resonance
By force.The light of different colours can be reinforced in the micro-cavity structure internal resonance of the pixel unit of corresponding color, and it is whole to optimize display base plate
The light emission rate and excitation purity of body, improve luminous efficiency.
Specifically, as shown in Fig. 2, the anode layer 140 may include the first transparency conducting layer 141, the second electrically conducting transparent
Layer 142 and the DBR reflecting mirror 143 between first transparency conducting layer 141 and second transparency conducting layer 142, institute
State the length that the distance between DBR reflecting mirror 143 and the cathode layer 120 are equal to micro-cavity structure.
In present embodiment, anode layer 140 is including DBR reflecting mirror 143 and is respectively formed in 143 two sides of DBR reflecting mirror
The first transparency conducting layer 141 and the second transparency conducting layer 142, i.e., form microcavity between DBR reflecting mirror 143 and cathode layer 120
Structure, distance between the two are the length of micro-cavity structure.
According to above structure, the scheme for adjusting the length of micro-cavity structure can include at least following two:
In a specific embodiment, as shown in Figure 1,120 He of the cathode layer of the pixel unit 100 of different colours
The thickness of the organic luminous layer 130 is equal, and the thickness of the anode layer 140 is different.
Further, as shown in Fig. 2, the thickness of first transparency conducting layer 141 of the pixel unit 100 of different colours
Identical, the thickness of the DBR reflecting mirror 143 is different.
In another embodiment specific implementation mode, as shown in figure 4, the DBR reflecting mirror of the pixel unit 100 of different colours
143 thickness is equal, and the thickness of the organic luminous layer is different.
It is anti-by the first transparency conducting layer 141 and DBR of anode layer 140 based on the length of micro-cavity structure in present embodiment
The thickness of the thickness and organic luminous layer 130 of penetrating mirror 143 determines that the scheme for adjusting micro-cavity structure can include that adjustment has
The thickness of the thickness of machine luminescent layer 130 or the DBR reflecting mirror 143 in the thickness of anode layer 140, especially anode layer 140,
So that the length of micro-cavity structure meets the integral multiple of half-wavelength.Preferably, the technique stream of the thickness of DBR reflecting mirror 143 is adjusted
Journey is relatively simple, and thickness control is also more accurate.
The display base plate that above embodiment provides, the composition in micro-cavity structure, from the thickness of the DBR reflecting mirror of anode layer
The thickness of degree or organic luminous layer adjusts the length of micro-cavity structure, so that the length of microcavity mechanism is able to satisfy corresponding monochrome
The integral multiple of the half-wavelength of light, and preparation process is simple, further improves the luminous efficiency of display base plate.
In addition, the cathode layer 120 can be the semi-transparent reflective coating of silver-colored (Mg:Ag) alloy of magnesium.
Display base plate is Dual Implantations formula device, and electrons and holes are injected from cathode layer and anode layer respectively, and in organic hair
Compound generation exciton in photosphere and radioluminescence.It is applied since the electronics of organic material is affine than metal and the electronics of inorganic material parent
Much smaller with gesture, to effectively inject electronics into organic material, the work function of cathode material must be sufficiently low.Therefore cathode
Material can use single-layer metal: magnesium Mg (3.7eV), lithium Li (2.9eV), calcium Ca (2.9eV), strontium Sr (2.4eV), sodium Na
(2.3eV), caesium Cs (2.1eV) and gadolinium Gd etc..To prevent water and oxygen from having an adverse effect to low workfunction metal cathode, preferably
Using alloy cathode: calcium/aluminium Ca/Al, magnesium/silver Mg/Ag, magnesium/magnesium silver Mg/MgAg, gadolinium/aluminium Gd/Al, aluminium/lithium Al/Li, tin/aluminium
Sn/Al and silver/aluminium Ag/Al etc..It is total with the metal Mg and high work function and chemical property of low work function more stable metal Ag
It steams the alloy cathode Mg/Ag (10:1) formed and is used as cathode material, electron injection efficiency highest.
In present embodiment, further mentioned using semi-transparent composite film made of Mg:Ag alloy as cathode layer 120
The high luminous efficiency of display base plate.
The specific structure of organic luminous layer 130 can be correspondingly arranged according to the structure of display base plate, including single luminescent layer
Or at least two concatenated luminescent layer.When organic luminous layer 130 is single luminescent layer, the film layer structure of display base plate is successively
Are as follows: first transparency conducting layer indium tin oxide ITO, DBR reflecting mirror, the first transparency conducting layer ITO2, hole injection layer HIL1, sky
Cave transport layer HTL, blue light-emitting layer B-EML, red light emitting layer R-EML, electron transfer layer ETL, magnesium silver composite membrane layer Mg:Ag,
When organic luminous layer 130 is the luminescent layer that at least two are serially connected, the film layer structure of display base plate is successively are as follows: ITO, DBR,
ITO2, HIL, HTL1, B-EML, n-ETL, HIL, HTL, R-EML, green light emitting layer G-EML, ETL, Mg:Ag.
In another embodiment specific implementation mode, as shown in figure 5, the DBR reflecting mirror 143 includes intersecting the titanium dioxide stacked
Silicon layer 145 and titanium dioxide layer 144.
DBR mirror lens constructed by present embodiment includes intersecting the silicon dioxide layer 145 stacked and titanium dioxide layer
144, it can be by adjusting film layer arrangement period and/or thickness, to realize reflection to different-waveband light and micro-cavity structure
Length adjustment.
The embodiment of the invention also provides a kind of display device, the display base provided including above-mentioned embodiment shown in FIG. 1
Plate.Specifically, the display device can be with are as follows: TV, display, Digital Frame, mobile phone, tablet computer etc. are any to have display
The products or components of function especially virtually show the near-eye display devices such as (Virtual Reality, abbreviation VR) glasses.
In addition, the display device further includes drive circuit board and flexible circuit board, the flexible circuit board is for connecting
The display base plate and the drive circuit board.
In the embodiment of the present invention, the display base plate of display device includes multiple pixel units, the cathode of each pixel unit
Micro-cavity structure is formed between layer and anode layer, and the length of the corresponding micro-cavity structure of the pixel unit that different colours are arranged is not
Together.In this way, the brightness of the light of different colours can be by the micro-cavity structure in the pixel unit of corresponding color in display base plate
It is promoted, the microcavity effect in display base plate can make different monochromatic light realize resonant check, effectively improve display device
Luminous efficiency and colour gamut.The specific implementation process of display device provided in an embodiment of the present invention may refer to above-described embodiment offer
Display base plate specific implementation process, this is no longer going to repeat them.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of display base plate, which is characterized in that including multiple pixel units, each pixel unit include reflective anode layer,
Semi-transparent cathode layer and the organic luminous layer between the anode layer and the cathode layer, the cathode layer and the sun
Micro-cavity structure is formed between the layer of pole, the length of the corresponding micro-cavity structure of the pixel unit of different colours is different.
2. display base plate according to claim 1, which is characterized in that the length of the micro-cavity structure of the pixel unit is equal to
The integral multiple of the half-wavelength of the corresponding light of the color of the pixel unit.
3. display base plate according to claim 2, which is characterized in that the pixel unit includes three kinds of pixels of red, green, blue
Unit.
4. display base plate according to claim 3, which is characterized in that the anode layer includes the first transparency conducting layer, the
Two transparency conducting layers and the distributed Bragg DBR between first transparency conducting layer and second transparency conducting layer
Reflecting mirror, the distance between the DBR reflecting mirror and the cathode layer are equal to the length of micro-cavity structure.
5. display base plate according to claim 4, which is characterized in that the cathode layer of the pixel unit of different colours and
The thickness of the organic luminous layer is equal, and the thickness of the anode layer is different.
6. display base plate according to claim 5, which is characterized in that it is anti-that first transparency conducting layer is located at the DBR
It penetrates between mirror and the organic luminous layer；
The thickness of first transparency conducting layer of the pixel unit of different colours is identical, and the thickness of the DBR reflecting mirror is different.
7. display base plate according to claim 4, which is characterized in that the DBR of the pixel unit of different colours reflects
The thickness of mirror is equal, and the cathode layer is different with the thickness of the organic luminous layer.
8. display base plate according to any one of claim 1 to 7, which is characterized in that the cathode layer is magnesium silver alloy
Semi-transparent reflective coating.
9. display base plate according to any one of claims 4 to 7, which is characterized in that the DBR reflecting mirror includes alternating
The silicon dioxide layer and titanium dioxide layer of stacking.
10. a kind of display device, which is characterized in that including display base plate as claimed in any one of claims 1-9 wherein.
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| CN112786669A (en) * | 2021-01-08 | 2021-05-11 | 深圳市华星光电半导体显示技术有限公司 | OLED display panel |
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Application publication date: 20190524 |