CN101346020B - Display apparatus and imaging system using the same - Google Patents

Display apparatus and imaging system using the same Download PDF

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CN101346020B
CN101346020B CN2008101283002A CN200810128300A CN101346020B CN 101346020 B CN101346020 B CN 101346020B CN 2008101283002 A CN2008101283002 A CN 2008101283002A CN 200810128300 A CN200810128300 A CN 200810128300A CN 101346020 B CN101346020 B CN 101346020B
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sub
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pixel
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CN101346020A (en
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丸博之
结城修
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Canon Inc
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
    • H10K30/80—Constructional details
    • H10K30/81—Electrodes
    • H10K30/82—Transparent electrodes, e.g. indium tin oxide [ITO] electrodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/14—Carrier transporting layers
    • H10K50/15—Hole transporting layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/14—Carrier transporting layers
    • H10K50/16—Electron transporting layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/127—Active-matrix OLED [AMOLED] displays comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

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Abstract

Provided is a display apparatus including multiple light emitting devices, in which each of the light emitting devices includes a reflective layer and a light emitting layer which are stacked, using interference between light directed from the light emitting layer to the reflective layer so as to be reflected by the reflective layer and light directed from the light emitting layer in the direction opposite to the reflective layer, and in which the multiple light emitting devices include a first light emitting device, a second light emitting device having a light emission color different from the first light emitting device, and a third light emitting device having the same emission spectrum as a spectrum in which light emission of the first light emitting device and light emission of the second light emitting device are mixed.

Description

Display device and the imaging system of using it
Technical field
The present invention relates to display device and the imaging system of using it.
Background technology
Recently, the development of organic electroluminescent (organic EL) is pursued energetically.
For example, Japanese Patent Application Publication No.2003-272857 discloses a kind of white organic El device that comprises stacked indigo plant (B) luminescent layer and Huang (Y) or red (R) luminescent layer.
In addition, the known display device that can launch colourama, it comprises emission red, green (G) and blue material and the organic layer that forms and be layered on the substrate, thereby forms the sub-pixel with matrix arrangement.
Also known colour matrix display device with similar color configuration.This display device comprises the material and the organic layer of white (W) look of emission that forms and be layered on the substrate, thereby forms the matrix that is laminated with R, G and B colour filter on it.
And, known matrix display device also, it also comprises the W sub-pixel that does not possess colour filter, so R, G, B and W sub-pixel are carried out colored the demonstration except above-mentioned R, G and B sub-pixel with colour filter.For example, U.S. Patent No. 6570584 discloses the display device that comprises more than the sub-pixel of the color of R, G and B.
U.S. Patent No. 6570584 discloses a kind of method that is used to drive such device, wherein, mixes the luminous of R light-emitting device, G light-emitting device, B light-emitting device and W light-emitting device based on calculating, thereby can produce desired color.
On the other hand, Japanese Patent Application Publication No.2006-163068 has described: in many cases, the colourity (chromaticity) of the white that obtains by luminescent material in fact is not the target colourity of white, so luminous the adding to that is necessary the RGB unit pixel that will be used to match colors is used for the white luminous of unit pixel that white shows.Japanese Patent Application Publication No.2006-163068 also discloses a kind of signal processing mode, wherein, and hybrid RGB input signal when the luminescent chromaticity of W pixel is different from white target colourity.
Can think from foregoing description, the target colourity that is set as white when the luminescent chromaticity of W sub-pixel is when being suitable for the luminescent chromaticity of (adapt to) R+G+B sub-pixel group, and the unnecessary R+G+B sub-pixel group that will be used to match colors luminous is mixed into and is used for the luminous of W sub-pixel that white shows.
Yet, do not using under the luminous situation of interference (PL is luminous etc.), in fact metamerism (metamerism) takes place as glow color.Even when the mixed luminescence color, identical color also occurs.For example, prepared " wherein as the light-emitting device of sub-pixel luminous luminous " and " luminous from the sub-pixel of metamerism is though described luminous spectral shape is different from wherein luminous by the spectral shape with the luminous mixed spectra of certain ratio mixing as the light-emitting device of sub-pixel " by what mix with certain ratio.
In the following description, described " wherein as the light-emitting device of sub-pixel luminous luminous by what mix with certain ratio " is called " mixed light of sub-pixel group " for short.Described " luminous from the sub-pixel of metamerism is though described luminous spectral shape is different from wherein luminous by the spectral shape of the luminous mixed spectra that mixes with certain ratio as the light-emitting device of sub-pixel " is called " from the sub-pixel of metamerism luminous " for short.
In addition, by using "+" to represent to have a plurality of luminous combination of the sub-pixel of different glow colors.For example, the luminous combination of R sub-pixel, G sub-pixel and B sub-pixel is called as " R+G+B sub-pixel group luminous ".
Notice that sub-pixel is meant the unit of the light-emitting device that can control luminous Push And Release or its gray scale (gradation).Pixel is one group of sub-pixel, and refers to the colored minimum unit that shows.
Those are luminous and when not interfering when mixing, and each of " mixed light of sub-pixel group " and " from the sub-pixel of metamerism luminous " be luminous to have the cie color coordinate identical with its mixed light (being designated hereinafter simply as " chromaticity coordinate ").
Yet, use under the luminous of selfluminous device and the situation from the display device of the interference between the reverberation of reflecting plate, " mixed light of sub-pixel " has different chromaticity coordinates with " from the sub-pixel of metamerism luminous ".
This is because the luminous intensity that causes because of interference has the characteristic according to the wavelength in the display device that comprises interference structure under certain condition.Therefore, under the above-mentioned luminous situation that the light of different spectrum is launched, the spectrum after the interference is modulated therein, makes the chromaticity coordinate of being calculated by the integrated value of spectrum also be changed.
For example, under the situation of the W sub-pixel with different spectrum as the fill-in light of B+Y sub-pixel group in metamerism is provided, the spectrum after the interference is modulated, makes the chromaticity coordinate of being calculated by the integrated value of spectrum also be changed.
In addition, because two luminous spectrum differ from one another, so when the blending ratio between the luminous and W sub-pixel that changes R+G+B sub-pixel group luminous, the colourity after the interference also is changed.
In addition, thereby when changing interference condition from the normal direction inclination visual angle of display surface, thereby the luminous colourity of the luminous colourity of B+Y sub-pixel group and W sub-pixel is changed and differs from one another.
In above-mentioned Japanese Patent Application Publication No.2006-163068, under the situation of R+G+B sub-pixel group+W sub-pixel, R and/or G and/or B light are launched and are used for color matching.According to this control, colourity is matched each other.Yet, because two luminous spectrum differ from one another, so when the blending ratio between the luminous and W sub-pixel that changes R+G+B sub-pixel group luminous, the colourity after the interference is changed.
In addition, thereby when changing interference condition from the normal direction inclination visual angle of display surface, thereby the luminous colourity of the luminous colourity of R+G+B sub-pixel group and W sub-pixel is changed in the mode identical with above-mentioned example and differs from one another.
The result, even when the chromaticity coordinate of the chromaticity coordinate of combination " mixed light of sub-pixel group " and " from the sub-pixel of metamerism luminous " when forming metamerism, the chromaticity coordinate of the white that obtains from the display surface of display device after interfering may depart from desired value when spectral drift (shift).
Note, and in technology is described as a setting colour filter type R, G, B and W display device, R, the G and the B colour filter that are arranged on the white matrix base plate may make individual wave-length coverage narrow down.Therefore, even when mixing R, G and B light-emitting device luminous, the spectrum of described mixed light also mismatches with the luminous spectrum of the W sub-pixel that does not have colour filter.
Summary of the invention
The purpose of this invention is to provide the display device of use interfering, wherein, " mixed light of sub-pixel " can be mixed to have identical glow color with " from the sub-pixel of metamerism luminous ".In addition, another object of the present invention provides the imaging system of using described display device.
According to the present invention, a kind of display device is provided, it comprises a plurality of light-emitting devices, wherein each light-emitting device comprises stacked reflector and luminescent layer, use is being pointed to the reflector with by the light of described reflective layer reflects with point to interference between the light of the direction relative with described reflector from luminescent layer from luminescent layer, and wherein said a plurality of light-emitting device comprises: first light-emitting device; Second light-emitting device with the glow color that is different from first light-emitting device; And the 3rd light-emitting device with emission spectrum identical with the luminous spectrum that wherein mixes the luminous of first light-emitting device and second light-emitting device.
According to the present invention, the mixed light that the colourity that can obtain not cause because of interference is drifted about.In other words, in the display device of use interfering, " mixed light of sub-pixel group " also can be mixed to have identical glow color with " from the sub-pixel of metamerism luminous ".
In addition, even when " mixed light of sub-pixel " and " from the sub-pixel of metamerism luminous " mixes with the blending ratio that changes between them, interfere the chromaticity coordinate of the light that the back obtains also not change.
And, even thereby when the normal direction inclination visual angle from display surface changes interference condition, interfere the chromaticity coordinate of the light of back acquisition also not change.
Further feature of the present invention will from below with reference to accompanying drawing to the description of exemplary embodiment and become obvious.
Description of drawings
Fig. 1 is the cie color coordinate diagram of the luminous and mixed light of R, G and B light-emitting device.
Fig. 2 is the cie color coordinate diagram of W light-emitting device.
Fig. 3 is the PL spectrogram of R luminescent material.
Fig. 4 is the PL spectrogram of G luminescent material.
Fig. 5 is the PL spectrogram of B luminescent material.
Fig. 6 is the PL spectrogram of the mixed light of R+G+B sub-pixel group.
Fig. 7 is the emission spectrum figure of R+G+B sub-pixel group.
Fig. 8 is the emission spectrum figure of W sub-pixel group.
Fig. 9 is the figure of the structure of explanation light-emitting device.
Figure 10 is to use the emission spectrum figure of R+G+B sub-pixel group in the display device of interference.
Figure 11 is to use the emission spectrum figure of R+G+B+W sub-pixel group in the display device of interference.
Figure 12 illustrates the figure that has vertical stacked, uses the structure of the R+G+B sub-pixel group of interfering.
Figure 13 illustrates the figure that has vertical stacked, uses the structure of the W pixel of interfering.
Figure 14 illustrates the figure that has vertical stacked, uses the layout of R, G, B and the W sub-pixel of interfering.
Figure 15 is the figure of the layout of explanation R, the G, B and the W that have planar structure, use to interfere (R '+G '+B ') sub-pixel.
Figure 16 A and 16B are the figure that the driving of R, G, B and W light-emitting device with planar structure is described.
Figure 17 be to use the display device of interference R+G+B (+B) the sub-pixel group is at 0 degree and the 60 emission spectrum figure that spend.
Figure 18 is to use the emission spectrum figure of W (B+Y) sub-pixel of the display device of interference at 0 degree and 60 degree.
Figure 19 is to use the R+G+B sub-pixel group and W (B+Y) sub-pixel of the display device of interference to spend and the 60 emission spectrum figure that spend 0.
Figure 20 is the figure of explanation R, G, B and the relevant layout of W sub-pixel.
Figure 21 is the figure of the relevant vertical stratification of explanation display device.
Figure 22 is the figure that drives the equivalent electric circuit of relevant R, G, B and W light-emitting device.
Figure 23 is the PL spectrogram of W sub-pixel.
Figure 24 is to use the emission spectrum figure of W sub-pixel in the display device of interference.
Figure 25 is to use the emission spectrum figure of R+G+B+W sub-pixel in the display device of interference.
Embodiment
Description is according to the embodiment of the imaging system of display device of the present invention and the described display device of use.
Before the imaging system of describing according to display device of the present invention and the described display device of use, the problem of the above-mentioned relevant display device of at first following confirmation.
Manufacturing has R, G, B and the W light-emitting device of the vertical stratification shown in Figure 21, to realize the layout of the sub-pixel shown in Figure 20.Here, numeral 21 expression TFT substrates, numeral 22 expression TFT, numeral 23 expression drain electrodes, numeral 24 expression source electrodes, numeral 25 expression anodes, numeral 26 expression hole transport layers, numeral 27 expression electron transport layer, digital 28 indication device barrier films, numeral 29 expression R organic layers, numeral 30 expression negative electrodes, numeral 31 expression G organic layers, numeral 32 expression B organic layers, the white organic layer of numeral 33 expressions, numeral 34 expression planarization films.Notice that as shown in figure 22, those light-emitting devices are controlled to have luminous quantity independent of each other.
In R, G, B and the W light-emitting device each has apparatus structure shown in Figure 9.Here, numeral 10 expression glass substrates, numeral 11 expressions have the metal anode (reflecting electrode) of reflecting properties, numeral 12 expression hole transport layers, numeral 13 expression luminescent layers, numeral 14 expression electron transport layer, numeral 15 expression electron injecting layers, numeral 16 expression transparent conductive cathodes (transparency electrode).
When electronics and hole-recombination in luminescent layer 13, light-emitting device is launched the distinctive light of its material.During this time, towards the light of transparency electrode 16 emission with from the interference of light of reflecting electrode 11, has the glow color of the PL glow color that is different from material itself so become from the light of transparency electrode 16.
Have the R luminescent material of the PL shown in Fig. 3 (luminescence generated by light) spectral shape, the B luminescent material that has the G luminescent material of the PL spectral shape shown in Fig. 4 and have a PL spectral shape shown in Fig. 5 and be used separately as the luminescent layer 13 of R, G and B light-emitting device (sub-pixel).
On the other hand, the W luminescent material with the PL spectral shape shown in Figure 23 is used as the luminescent layer 13 of W sub-pixel.Here, by mixing the material that B and Y luminescent material prepare the luminescent layer 13 of W sub-pixel, so its PL spectrum has the shape shown in Figure 23.
When not considering interference effect, the chromaticity coordinate of that white PL of two types luminous (the luminous and B+Y sub-pixel (W sub-pixel) of R+G+B sub-pixel group luminous) has the metamerism shown in following table 1 and 2.
Table 1
Figure S2008101283002D00071
Table 2
Figure S2008101283002D00072
Measure chromaticity coordinate about the luminous of the luminous and W sub-pixel of the R+G+B sub-pixel group of having considered interference effect.Each white chromaticity coordinate of explanation in table 3 and 4.
Table 3
Figure S2008101283002D00073
Table 4
When in the PL of material itself is luminous, not considering interference effect, the luminous chromaticity coordinate of the luminous and W sub-pixel of R+G+B sub-pixel group with metamerism.Yet about having considered the light from sub-pixel of interference effect, the luminous chromaticity coordinate of R+G+B sub-pixel group is from the luminous chromaticity coordinate drift of W sub-pixel.
Therefore, when the luminous and W sub-pixel of the R+G+B sub-pixel group of mixing metamerism simply luminous, use the chromaticity coordinate of the white that the display device of interfering can not obtain to expect.
The luminous spectrum of the R+G+B sub-pixel group after the interference is illustrated among Figure 10, and the luminous spectrum of the W sub-pixel after interfering is illustrated among Figure 24.When mixing those spectrum, can obtain spectrum luminous as shown in Figure 25.This shape is different from each in the shape shown in Figure 10 and 24, therefore can understand the chromaticity coordinate of the white that can not obtain to expect.
Therefore, display device of the present invention comprises: comprise a plurality of light-emitting devices of stacked reflector and luminescent layer, wherein each light-emitting device uses and is pointing to the reflector from luminescent layer with by the light of described reflective layer reflects with point to interference between the light of the direction relative with described reflector from luminescent layer.In addition, the structure that has of described display device comprises: first light-emitting device; Second light-emitting device with the glow color that is different from first light-emitting device; And the 3rd light-emitting device with emission spectrum identical with the luminous spectrum that wherein mixes the luminous of first light-emitting device and second light-emitting device.
In other words, by mix the luminous of first light-emitting device and second light-emitting device luminous obtain luminous (promptly, " mixed light of sub-pixel group ") spectrum have the substantially the same shape of spectrum with luminous (that is, " from the sub-pixel of metamerism luminous ") of the 3rd light-emitting device.
Be used to realize that the concrete mode of said structure is as follows.
(1) on substrate, stacks gradually first light-emitting device and second light-emitting device.On substrate, arrange the 3rd light-emitting device.
(2) on substrate, arrange first light-emitting device, second light-emitting device and the 3rd light-emitting device.The 3rd light-emitting device is formed with the luminescent material with emission spectrum of second light-emitting device by the luminescent material of the emission spectrum with first light-emitting device.
In said structure (2), that is, the sub-pixel of first light-emitting device and second light-emitting device is arranged respectively, and sub-pixel is connected to each other to constitute the 3rd light-emitting device.
Notice that the structure of first light-emitting device, second light-emitting device and the 3rd light-emitting device is not limited to said structure.Can have luminescent material with " mixed light of sub-pixel " same spectra by combination and obtain " the 3rd light-emitting device luminous ".
Here, identical spectra (shape) is meant such situation: wherein, the number of the peak value of emission wavelength is identical between " mixed light of sub-pixel group " and " from the sub-pixel of metamerism luminous ", all peak wavelengths are all within the scope of ± 5nm, and its all half width is all within the scope of ± 5nm.
Among each embodiment that is described below, R and G light-emitting device are used separately as first light-emitting device and second light-emitting device, and increase the B light-emitting device.And the W light-emitting device is used as the 3rd light-emitting device.
Example 1
This example relates to the have said structure display device of (1).
W sub-pixel shown in the chromaticity coordinate of the R+G+B sub-pixel group that comprises R, G and B light-emitting device shown in the chromaticity coordinate of Fig. 1 and Fig. 2 is arranged side by side in the zone of display surface.Here, the chromaticity coordinate of the W sub-pixel shown in Fig. 2 is identical with the W chromaticity coordinate shown in Fig. 1.In this display device, target white has the chromaticity coordinate shown in Fig. 1 and 2.
Below, with the relation of describing in more detail between the spectrum of luminescent material of chromaticity coordinate.
The R luminescent material has the PL spectral shape shown in Fig. 3, and the G luminescent material has the PL spectral shape shown in Fig. 4, and the B luminescent material has the PL spectral shape shown in Fig. 5.In addition, the luminous PL spectrum of R+G+B sub-pixel group has the shape shown in Fig. 6.
Make the luminous of W sub-pixel be suitable for having and the PL spectrum identical spectra shown in Fig. 6, in the PL spectrum shown in Fig. 6, luminous with predetermined ratio mixing R, G and B light-emitting device.Therefore, that luminous chromaticity coordinate of white PL of two types is metamerism and has the identical spectra shape, and it is the relation of the spectrum between the W sub-pixel shown in the luminous and Fig. 8 of the R+G+B sub-pixel group shown in Fig. 7 luminous.
Use those materials, made the light-emitting device that has the apparatus structure shown in Fig. 9, uses interference.The white luminous spectrum of white luminous and W sub-pixel that comprises the R+G+B sub-pixel group of R, G with said apparatus structure and B light-emitting device has the shape shown in Figure 10.Measure each chromaticity coordinate, the chromaticity coordinate of the white after finding to interfere is identical between them, as shown in table 5.
Table 5
Figure S2008101283002D00091
On the other hand, the spectrum of the mixture of the light after the interference has the shape shown in Figure 11.
The chromaticity coordinate of the white of this spectrum shown in the table 6.
Table 6
Figure S2008101283002D00101
Like this, when spectral shape was identical, the white coordinate did not drift about when use to interfere mixing luminous and R+G+B sub-pixel group luminous of W sub-pixel.This also can be used to illustrate the luminous situation of the W sub-pixel of the above-mentioned spectral shape shown in Figure 23, and when another sub-pixel include B with the Y light-emitting device so that its mixed spectra can be identical the time, can obtain identical effect.As understanding from this, as long as blend color is to produce another color, then the number of sub-pixel can be 1,2 ..., n (n is an integer).
For the luminous mixed spectra that makes the luminous of above-mentioned first light-emitting device and second light-emitting device and the luminous spectrum of the 3rd light-emitting device are complementary, adopt structure as described below.
That is, made the display device of pixel with following structure.Pixel is the sub-pixel group and the wherein stacked as shown in figure 13 combination that has with the W light-emitting device of the luminescent material of the luminous mixed spectra identical spectra of R+G+B sub-pixel group of wherein vertically stacked as shown in figure 12 R, G and B light-emitting device.Figure 14 illustrates the layout of the sub-pixel of display device, for easy understanding, has arranged two pixels here.
In described figure, numeral 26 expression glass substrates, numeral 27 expressions are used to cause the reflecting plate of interfering.The transparency conducting layer that numeral 32 expressions are for example made by transparent oxide electric conducting material such as ITO or IZO.Numeral 20 expression transparency electrodes, numeral 21 expressions are used for injecting and carrying at luminescent layer the layer in hole, numeral 23 expression B luminescent layers, numeral 24 expression R luminescent layers.Numeral 25 expression G luminescent layers, numeral 22 expressions are used for injecting and transporting layer from the electronics of negative electrode at luminescent layer.Numeral 28 indicates to supply to the drive current of B light-emitting device, and numeral 29 indicates to supply to the drive current of R light-emitting device, and numeral 30 indicates to supply to the drive current of G light-emitting device, and numeral 31 indicates to supply to the drive current of W sub-pixel.In other words, R+G+B sub-pixel group has the structure of stacked luminescent material, and the W sub-pixel also has the structure of stacked luminescent material.Notice that light-emitting device can be organic light emitting apparatus (organic EL), thereby can form thin display device with simple relatively structure.
In having the display device of said structure, the luminous mixed spectra of R+G+B sub-pixel group is identical with the luminous spectrum of W sub-pixel.Therefore, the luminous and W sub-pixel of R+G+B sub-pixel group luminous has identical spectra.As a result, even the display device that use is interfered can not cause the luminous white drift that causes because of the luminous and W sub-pixel that mixes R+G+B sub-pixel group yet.
Example 2
This example relates to the have said structure display device of (2).
For the luminous mixed spectra that makes the luminous of first light-emitting device and second light-emitting device and the emission spectrum of the 3rd light-emitting device are complementary, made display device with following sub-pixel arrangements: wherein, make up as shown in Figure 15 R, G and B light-emitting device with as R ', G ' and the B ' light-emitting device of W sub-pixel.
In other words, the display device of manufacturing has pixel, in the described pixel each is the combination that comprises the sub-pixel of R, G and B light-emitting device and comprise the W sub-pixel of R ', G ' and B ' light-emitting device, in the described W sub-pixel that comprises R ', G ' and B ' light-emitting device, arrange the luminescent material that has with the luminous mixed spectra same spectra of R+G+B sub-pixel group.
R, G and B light-emitting device and R ', G ' and B ' light-emitting device have apparatus structure as shown in Figure 9.
As shown in Figure 16 A, arrange that in the plane R, G and B sub-pixel are supplied to independent drive current with luminous.In addition, as shown in Figure 16 B, connected and be supplied to drive current simultaneously with luminous as R ', the G ' of W sub-pixel and B ' light-emitting device.
Therefore, the luminous and W sub-pixel of R+G+B sub-pixel group luminous has identical spectra, even and use the display device of interfering also not cause drifting about because of the luminous white that causes of the luminous and W sub-pixel that mixes R+G+B sub-pixel group.
Although layout according to the sub-pixel shown in Figure 15, R, G and B sub-pixel and R ', G ' and B ' light-emitting device are disposed on the side of substrate, but R ', G ' and B ' light-emitting device can be arranged in the independent position that is positioned on the opposite side of substrate under R, G and the B sub-pixel.
The light-emitting device of this example can also be organic light emitting apparatus (organic El device), thereby can form the thin display device with simple relatively structure.
Example 3
This example is described: even when the angle of watching display device (visual angle) changes, also do not cause colourity difference between glow color, because the glow color of the glow color of R+G+B sub-pixel group and W sub-pixel changes in an identical manner.
Be similar to top description, measured the white luminous chromaticity coordinate of white luminous and W sub-pixel of the sub-pixel group of the R, the G that comprise use interference effect and B light-emitting device and other B light-emitting device with apparatus structure shown in Fig. 9.White luminous chromaticity coordinate is illustrated in respectively in table 7 and 8.Described chromaticity coordinate is as shown in the luminous situation following table 3 of mixing R, G and B light-emitting device.By contrast, when further mixing B light-emitting device luminous during to R, G and B light-emitting device luminous, obtain the metamerism shown in the table 7, its luminous chromaticity coordinate with the W sub-pixel shown in the table 8 is identical.
Table 7
Figure S2008101283002D00121
Table 8
Figure S2008101283002D00122
In this case, (under+the situation that B) value of the combination of the chromaticity coordinate between luminous and W sub-pixel luminous of sub-pixel changes, can not in using the display device of interfering, obtain the chromaticity coordinate of the white of expectation as mentioned above at the R+G+B of blending ratio from metamerism.
In addition, from the normal direction inclination visual angle of display surface, and measured (+B) sub-pixel group luminous and spend and the luminous chromaticity coordinate of the W sub-pixel that 60 spectrum of spending are represented with 0 shown in Figure 18 with the represented R+G+B of the spectrum of degree of 0 shown in Figure 17 and 60 degree.Its result is illustrated in table 9 and 10.Even when increasing the B light-emitting device so that the chromaticity coordinate of display device when becoming metamerism, in the chromaticity coordinate of the white that can not obtain to expect when changing interference condition from the normal direction inclination visual angle of display surface.
Table 9
Figure S2008101283002D00131
Table 10
Therefore, as shown in above-mentioned example 1, be arranged to luminous adjacent with the represented W sub-pixel of the chromaticity coordinate shown in Fig. 2 with luminous (mixed light) of the represented R+G+B sub-pixel group of the chromaticity coordinate shown in Fig. 1.Here, the luminous chromaticity coordinate of the W sub-pixel shown in Fig. 2 is identical with the W chromaticity coordinate shown in Fig. 1.In this display device, target white has the W chromaticity coordinate shown in Fig. 1 and 2.
Below, will the relation of the spectrum between the luminescent material of chromaticity coordinate be described in more detail.
The R luminescent material has the PL spectral shape shown in Fig. 3, and the G luminescent material has the PL spectral shape shown in Fig. 4, and the B luminescent material has the PL spectral shape shown in Fig. 5.In addition, the luminous PL spectrum of R+G+B sub-pixel group has the shape shown in Fig. 6.
Make the W sub-pixel luminous be suitable for identical with the PL spectrum shown in Fig. 6, in the PL spectrum shown in Fig. 6, luminous with predetermined ratio mixing R, G and B light-emitting device.Therefore, that luminous chromaticity coordinate of white PL of two types is a metamerism.Its spectral shape is also identical, thereby obtains the relation of the spectrum between the W sub-pixel shown in the luminous and Fig. 8 of the R+G+B sub-pixel group shown in Fig. 7 luminous.
In this case, under the situation that the value of the combination of the chromaticity coordinate between the luminous and W sub-pixel of the R+G+B sub-pixel group of blending ratio from metamerism luminous changes, the chromaticity coordinate of the white that in using the display device of interfering, also can obtain to expect.
In addition, from the normal direction inclination visual angle of display surface, and measured in R+G+B sub-pixel groups luminous of 0 degree and 60 degree with in the luminous chromaticity coordinate of 0 degree and the 60 W sub-pixels of spending.Luminous for the luminous and W sub-pixel of R+G+B sub-pixel group is in its result shown in the table 11.For mixed light with the spectrum shown in Figure 19, though from the normal direction inclination visual angle of display surface when changing interference condition, the also chromaticity coordinate of the white that can obtain to expect.
This be because, when the mixed spectra of R+G+B sub-pixel group when the change at visual angle changes, the spectrum of W pixel also changes similarly.Therefore, even when the change of the luminous spectrum of the change of the luminous mixed spectra of R+G+B sub-pixel group and W sub-pixel is added up, the spectrum of W pixel also changes in the mode identical with the luminous mixed spectra of R+G+B+W sub-pixel group.
Table 11
Figure S2008101283002D00141
The light-emitting device of this example can also be organic light emitting apparatus (organic EL), thereby can form the thin display device with simple relatively structure.
Example 4
A kind of imaging system (for example, digital camera) can be made up comprising display device, thereby the imaging system of above-mentioned effect can be realized having as the display part with said structure.
Although reference example embodiment has described the present invention, it being understood that to the invention is not restricted to disclosed exemplary embodiment.The scope of appended claim should be endowed the wideest explanation, to comprise all such modifications and equivalent configurations and function.

Claims (8)

1. a display device comprises substrate and a plurality of light-emitting device, wherein:
Each light-emitting device comprises stacked reflector and luminescent layer, uses and to point to described reflector from described luminescent layer with by the light of described reflective layer reflects with point to interference between the light of the direction relative with described reflector from described luminescent layer; And
Described a plurality of light-emitting device comprises: first light-emitting device; Second light-emitting device with the glow color that is different from described first light-emitting device; And the 3rd light-emitting device with emission spectrum identical with the luminous spectrum of luminous and described second light-emitting device that wherein mixes described first light-emitting device.
2. display device according to claim 1, wherein:
Described first light-emitting device and described second light-emitting device are stacked gradually on described substrate; And
Described the 3rd light-emitting device is disposed on the described substrate.
3. display device according to claim 1, wherein said first light-emitting device, described second light-emitting device and described the 3rd light-emitting device are arranged on the described substrate.
4. display device according to claim 1, the glow color of wherein said the 3rd light-emitting device are white.
5. display device according to claim 1, wherein said light-emitting device is an organic light emitting apparatus.
6. an imaging system comprises that display device according to claim 1 is as the display part.
7. a display device comprises a plurality of light-emitting devices, wherein:
Each light-emitting device comprises stacked reflector and luminescent layer, uses and to point to described reflector from described luminescent layer with by the light of described reflective layer reflects with point to interference between the light of the direction relative with described reflector from described luminescent layer; And
Described a plurality of light-emitting device comprises: first light-emitting device; Second light-emitting device with the glow color that is different from described first light-emitting device; The 3rd light-emitting device with the glow color that is different from described first light-emitting device and described second light-emitting device; And the 4th light-emitting device with emission spectrum identical with the luminous spectrum that wherein mixes described first light-emitting device, described second light-emitting device and described the 3rd light-emitting device.
8. display device according to claim 7, the glow color of wherein said first light-emitting device, described second light-emitting device and described the 3rd light-emitting device are respectively red, green and blue, and the glow color of described the 4th light-emitting device is a white.
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