JP2009037215A - Display device and imaging device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device that uses interference, in which a mixed light of sub-pixels and light emission from a sub-pixel can be mixed so as to make the emitted color identical. <P>SOLUTION: In the display device having a plurality of light-emitting elements each with a reflecting layer and a light-emitting layer laminated. Each light-emitting element uses interference between light directed from the light-emitting layer to the reflecting layer and reflected by the reflecting layer, and the light directed from the light-emitting layer, in a direction opposite to the reflecting layer, the plurality of light-emitting elements include a first light-emitting element, a second light-emitting element having a light emission color different from the first light-emitting element, and a third light-emitting element having the same emission spectrum as a spectrum in which light emission of the first light-emitting element and light emission of the second light-emitting element are mixed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device and an imaging device using the display device.

  In recent years, organic electroluminescence (organic EL) has been actively developed.

  For example, Patent Document 1 discloses a white organic EL element in which a blue (B) light emitting layer and a yellow (Y) to red (R) light emitting layer are stacked.

  There is also known a display device capable of color light emission in which red, green (G), and blue color developing materials and organic layers are stacked on a substrate and arranged in a matrix.

  In order to obtain a display device having a similar color configuration, a material that emits white (W) light and an organic layer are stacked on a substrate and arranged in a matrix, and R, G, and B color filters are disposed thereon. Laminated color matrix display devices are also known.

  Furthermore, there is also known a matrix display device that performs color display with R, G, B, and W, provided with W sub-pixels that are not provided with color filters in addition to the color filters R, G, and B described above. For example, Patent Document 2 discloses a display device having sub-pixels of more colors than R, G, and B.

  As a method for driving such an element, in Patent Document 2, the light emission of an R light emitting element, a G light emitting element, a B light emitting element, and a W light emitting element arranged in the display surface is mixed by calculation to obtain a desired color. Is disclosed.

  On the other hand, in Patent Document 3, “in practice, the white chromaticity obtained by the self-luminous material is often not the target white chromaticity, and the white luminescence of the unit pixel dedicated to white display is often Thus, it is necessary to add light emission of RGB unit pixels for toning ”. A signal processing means for mixing RGB input signals when the light emission chromaticity of the W pixel is different from the target white chromaticity is disclosed.

JP 2003-272857 A US Pat. No. 6,705,844 JP 2006-163068 A

  From the above disclosure, the light emission chromaticity of the W sub-pixel is set to the target white chromaticity, and is adjusted to the light emission chromaticity of the R + G + B sub-pixel group, thereby adjusting the light emission of the W sub-pixel at the time of white display. It tends to be thought that it is not necessary to mix the emission of the R + G + B sub-pixel groups.

  However, in the case of light emission that does not use interference (PL light emission or the like), the color of the same condition appears as the light emission color as it is, and even if they are mixed, they are the same color. For example, the spectrum shape is different from “mixed emission of light emitted from light emitting elements used as subpixels” and “mixed spectrum of light emitted from light emitting elements used as subpixels” Light emission from sub-pixels of the same color ”is prepared.

  Hereinafter, “light emission obtained by mixing light emission of light emitting elements used as sub-pixels in a certain amount” is abbreviated as “mixed light of sub-pixel group”. “The light emission from the sub-pixels of the same color condition is different from the mixed spectrum of the light emission obtained by mixing the light emission of the light-emitting elements used as the sub-pixels in a certain amount, but“ the light emission from the sub-pixels of the same color condition ” It abbreviates.

  Further, a combination of the light emission of a plurality of sub-pixels having different emission colors is represented by “+”. For example, a combination of the light emission of the R sub-pixel, the G sub-pixel, and the B sub-pixel is expressed as “R + G + B sub-pixel”. Group emission ".

  The sub-pixel means a unit of a light-emitting element capable of turning on / off light emission or controlling the gradation, and the pixel is a set of sub-pixels and is a minimum unit for color display. means.

  When these light emissions are mixed without interference, the CIE chromaticity coordinates (hereinafter referred to as “the mixed light of the sub-pixel group”) and the “light emission from the sub-pixels of the same color” and the mixed light are mixed. Both are simply the same as chromaticity coordinates).

  However, in the case of a display device using interference between the light emission of the light emitting element and the reflected light of the reflector, the chromaticity coordinates of “mixed light of subpixels” and “light emission from subpixels of the same color condition” are It does not match.

  This is because the intensity of light due to interference has characteristics depending on the wavelength in a display device made with an interference configuration under a certain condition. For this reason, in the case of both the above-described light emission that emit different spectrums, the spectrum after interference is modulated, and the chromaticity coordinates calculated from the integral value of the spectrum also change.

  For example, the same can be said for the case where W sub-pixels of different colors with different conditions are used as auxiliary light in the B + Y sub-pixel group, and the spectrum after interference is modulated, and the chromaticity coordinates calculated from the integral value of the spectrum also change. End up.

  Further, since the spectrums of the two are different, the chromaticity after interference changes when the mixing ratio of the light emission of the R + G + B subpixel group and the light emission of the W subpixel is changed.

  Further, when the interference condition is changed by tilting the viewing angle from the normal direction of the display surface, the chromaticity of the light emission of the B + Y sub-pixel group and the light emission of the W sub-pixel changes and is different.

  In Patent Document 3, in the case of R + G + B sub-pixel group + W sub-pixel, R or / and G or / and B are caused to emit light for color matching. The chromaticity can be adjusted by this control. However, since the two spectra are different, the chromaticity after interference changes when the mixing ratio of the light emission of the R + G + B subpixel group and the light emission of the W subpixel is changed.

  In addition, when the interference condition is changed by tilting the viewing angle from the normal direction of the display surface, the chromaticity of the light emission of the R + G + B sub-pixel group and the light emission of the W sub-pixel changes and is different from the above. Similar to the example.

  As a result, even if the chromaticity coordinates of the “mixed light of the sub-pixel group” and the chromaticity coordinates of “light emission from the sub-pixels of the condition equal color” are combined as the condition equal colors, these spectra are shifted. The chromaticity coordinates of white taken out from the display surface of the display device after interference deviate from the assumed values.

  In the color filter type R, G, B, and W display devices mentioned in the background art, the R, G, and B color filters placed on the white matrix substrate narrow the respective wavelength ranges. For this reason, even if the light emission of these R, G, and B light emitting elements is mixed, the spectrum of the mixed light does not become the same as the light emission spectrum of the W sub-pixel provided with no color filter.

  The present invention relates to a display device using interference, and in a case where “mixed light of sub-pixels” and “light emission from sub-pixels of the same color condition” are mixed, the display device can make the light emission colors the same. The purpose is to provide. Furthermore, it aims at providing the imaging device using the said display apparatus.

As means for solving the above problems, the present invention provides:
Having a plurality of light emitting elements in which a reflective layer and a light emitting layer are laminated,
Each light emitting element is a display device using interference between light reflected from the light emitting layer toward the reflective layer and reflected from the reflective layer and light directed from the light emitting layer to the opposite side of the reflective layer.
The plurality of light emitting elements include a first light emitting element, a second light emitting element having a light emission color different from that of the first light emitting element, light emission of the first light emitting element and light emission of the second light emitting element. And a third light-emitting element having the same emission spectrum as the mixed spectrum.

  According to the present invention, it is possible to obtain mixed light free from chromaticity shift due to interference. That is, even in a display device using interference, when “mixed light of sub-pixel groups” and “light emission from sub-pixels of the same color condition” are mixed, the light emission colors can be made the same.

  Further, even if the mixing ratio of “mixed light of the sub-pixel group” and “light emission from sub-pixels of the same color condition” is mixed, the chromaticity coordinates of the extracted light after the interference do not change.

  Furthermore, even if the viewing angle is tilted from the normal direction of the display surface to change the interference condition, the chromaticity coordinates of the extracted light after the interference do not change.

  An embodiment of a display device according to the present invention and an imaging device using the display device will be described.

  First, before describing embodiments of a display device according to the present invention and an imaging device using the display device, problems in the above-described conventional display device were confirmed.

  In order to obtain the sub-pixel arrangement shown in FIG. 20, R, G, B, and W light-emitting elements were fabricated in a vertical structure as shown in FIG. Note that the light emission amounts of these light emitting elements are independently controlled as shown in FIG.

  The R, G, B, and W light emitting elements each have a device structure as shown in FIG. Here, 10 is a glass substrate, 11 is a reflective metal anode (reflecting electrode), 12 is a hole transport layer, 13 is a light emitting layer, 14 is an electron transport layer, 15 is an electron injection layer, and 16 is a transparent conductive material. The negative electrode (transparent electrode) is shown.

  In the light emitting element, electrons and holes recombine in the light emitting layer 13 to emit light specific to the material. At this time, light emitted to the transparent electrode 16 side and light from the reflective electrode 11 interfere with each other, and the light from the transparent electrode 16 side is different from the PL emission color of the material alone.

  Here, in the R light emitting element (sub-pixel), an R light emitting material having a PL (photoluminescence) spectrum shape shown in FIG. 3 was used as a constituent material of the light emitting layer 13. Further, in the G light emitting element (sub-pixel), the G light emitting material having the PL spectrum shape shown in FIG. 4 was used as the constituent material of the light emitting layer 13. On the other hand, in the B light-emitting element (sub-pixel), the PL spectrum-shaped B light-emitting material shown in FIG. 5 was used as the constituent material of the light-emitting layer 13.

  On the other hand, as the light emitting layer 13 of the W subpixel, a W light emitting material having a PL spectrum shape shown in FIG. 23 was used. Here, since the material of the light-emitting layer 13 of the W subpixel is a mixture of B and Y light-emitting materials, the PL spectrum has a shape as shown in FIG.

  When the interference effect is not considered, the chromaticity coordinates of the white PL light emission of these two types (light emission of the R + G + B sub-pixel group and light emission of the B + Y sub-pixel (W sub-pixel)) are as shown in Tables 1 and 2, respectively. It was a color.

  The chromaticity coordinates of the light emission of the R + G + B subpixel group considering the interference effect and the light emission of the W subpixel were measured. Tables 3 and 4 show the chromaticity coordinates of each white.

  In the case where the interference effect is not considered in the PL light emission of the material alone, the light emission of the R + G + B sub-pixel group and the light emission of the W sub-pixel are chromaticity coordinates of the same color. However, in the light from the sub-pixel considering the interference effect, the chromaticity coordinates of the light emission of the R + G + B sub-pixel group and the chromaticity coordinates of the light emission of the W sub-pixel are shifted.

  Therefore, in a display device using interference, a desired white chromaticity coordinate cannot be obtained by simply mixing the light emission of the R + G + B subpixel group of the same color and the light emission of the W subpixel.

  The spectrum after interference of light emission of the R + G + B subpixel group is shown in FIG. 10, and the spectrum after interference of light emission of the W subpixel is shown in FIG. When these spectra are mixed, light emission having a spectrum as shown in FIG. 25 is obtained. Since this shape is different from FIG. 10 and FIG. 24, it can be seen that a desired white chromaticity coordinate cannot be obtained.

  Therefore, the display device of the present invention includes a plurality of light-emitting elements in which a reflective layer and a light-emitting layer are stacked, and each light-emitting element has light reflected from the reflective layer toward the reflective layer from the light-emitting layer. The display device uses interference with light traveling from the light emitting layer to the side opposite to the reflective layer. The first light-emitting element, the second light-emitting element having a light emission color different from that of the first light-emitting element, and the same spectrum as a mixture of the light emission of the first light-emitting element and the light emission of the second light-emitting element And a third light-emitting element having an emission spectrum.

  That is, light emission obtained by mixing light emission of the first light-emitting element and light emission of the second light-emitting element (“mixed light of sub-pixel group”) and light emission of the third light-emitting element (“conditional color matching”) The shape of the emission spectrum of “light emission from the sub-pixel”) was made to substantially coincide.

The specific means includes the following means.
(1) A first light emitting element and a second light emitting element are stacked on a substrate. The third light emitting element includes a light emitting material having a light emission spectrum of the first light emitting element and a light emitting material having a light emission spectrum of the second light emitting element, the first light emitting element and the second light emitting element on the substrate. A plurality of light emitting elements are stacked on the same substrate surface.
(2) The first light emitting element and the second light emitting element are disposed on the substrate. The third light emitting element includes a light emitting material having a light emission spectrum of the first light emitting element and a light emitting material having a light emission spectrum of the second light emitting element, the first light emitting element and the second light emitting element on the substrate. A plurality of light emitting elements are disposed on the same substrate surface.

  That is, in the configuration (2), the sub pixels of the first and second light emitting elements are separately provided, and the sub pixels are connected to each other to form the third light emitting element.

  Note that the first light-emitting element, the second light-emitting element, and the third light-emitting element are not limited to the above structure, and the “third light-emitting element” can be formed by synthesizing a light-emitting material having the same spectrum as the “mixed light of the sub-pixel group”. You may make it obtain "light emission of a light emitting element."

  Here, the same spectrum (shape) means that the number of peak values of emission wavelengths of “mixed light of sub-pixel group” and “light emission from sub-pixels of the same color condition” are equal, and the peak wavelength is within ± 5 nm. And the half-value width is within ± 5 nm.

  Incidentally, each of the following embodiments extends the concept of making the emission spectrum shape the same between the light emission of the first light emitting element and the second light emitting element and the light emission of the third light emitting element. . Specifically, the emission spectrum shapes are the same between the light emission of the first light emitting element to the third light emitting element and the light emission of the fourth light emitting element. In the present invention, the number of light emitting elements used in the sub-pixel group is not limited to two or three, and any number may be used as long as the light emission of a plurality of light emitting elements is mixed. In the following embodiments, R (red), G (green), and B (blue) light emitting elements are used as the first light emitting element, the second light emitting element, and the third light emitting element, respectively. A W (white) light emitting element is used as the light emitting element.

<Embodiment 1>
The present embodiment relates to a display device adopting the configuration (1).

  An R + G + B sub-pixel group composed of R, G, and B light-emitting elements indicated by the chromaticity coordinates shown in FIG. 1 and a W sub-pixel indicated by the chromaticity coordinates shown in FIG. did. Here, the chromaticity coordinates of the W sub-pixel in FIG. 2 are the same as the W chromaticity coordinates in FIG. In this display device, the target white color is the chromaticity coordinate of W in FIGS.

  Hereinafter, the spectral relationship of the light emitting material having these chromaticity coordinates will be described more specifically.

  The R luminescent material had the PL spectrum shape shown in FIG. 3, the G luminescent material had the PL spectrum shape shown in FIG. 4, and the B luminescent material had the PL spectrum shape shown in FIG. Further, the PL spectrum of light emission of the R + G + B sub-pixel group has the shape shown in FIG.

  The light emission of the W sub-pixel is made equal to the PL spectrum of FIG. 6 in which the light emission of the R, G, and B light emitting elements are mixed at a predetermined ratio. Therefore, the chromaticity coordinates of these two types of white PL emission are the same color, and the spectrum shapes are also equal, and the emission of the R + G + B subpixel group shown in FIG. 7 and the emission of the W subpixel shown in FIG. Spectral relationship.

  Using these materials, a light-emitting element using the interference of the device structure shown in FIG. 9 was manufactured. The spectrum of white light emission of the R + G + B sub-pixel group composed of R, G, B light-emitting elements of the device structure and white light emission of the W sub-pixel has the shape shown in FIG. When the respective chromaticity coordinates are measured, the chromaticity coordinates of white after interference are equal as shown in Table 5.

  On the other hand, the spectrum obtained by mixing both lights after interference has the shape shown in FIG. 11 and Table 6 shows the white chromaticity coordinates of this spectrum.

  In this way, when the spectrum shapes are the same, even if the light emission of the W sub-pixel is mixed with the light emission of the R + G + B sub-pixel group using interference, the white coordinates are not shifted. This is also applied to the case of the light emission of the W sub-pixel showing the spectrum shape of FIG. 23 described above. The same effect can be obtained even if the other sub-pixel is composed of B and Y light-emitting elements and the mixed spectrum is the same. Is obtained. As can be seen from these, the number of sub-pixels may be 1, 2,..., N (n is an integer) as long as colors can be mixed to create another color.

  In order to match the mixed spectrum of the light emission of the first light-emitting element and the light emission of the second light-emitting element described above with the spectrum of light emission of the third light-emitting element, the following configuration was adopted.

  That is, a sub-pixel group in which R, G, and B light-emitting elements are vertically stacked as shown in FIG. 12 and a plurality of light-emitting materials having the same spectrum as the mixed spectrum of light emission of the R + G + B pixel group are stacked. A display device having a pixel in combination with a sub-pixel in which a plurality of layers are stacked was manufactured. Specifically, this display device is shown in FIG. FIG. 14 shows a sub-pixel arrangement of the display device, and here, an arrangement for two pixels is shown for easy understanding.

  Incidentally, in the figure, 26 is a glass substrate, and 27 is a reflecting plate for causing interference. 32 is a transparent conductive layer, for example, a transparent oxide conductive material such as ITO or IZO is used. 20 is a transparent electrode, 21 is a layer for injecting and transferring holes to the light emitting layer, 23 is a B light emitting layer, and 24 is an R light emitting layer. Reference numeral 25 denotes a G light emitting layer, and reference numeral 22 denotes a layer that injects and transfers electrons from the cathode to the light emitting layer. 28 is a driving current supplied to the B light emitting element, 29 is a driving current supplied to the R light emitting element, 30 is a driving current supplied to the G light emitting element, and 31 is a driving current supplied to the W sub-pixel. That is, the R + G + B subpixel group has a configuration in which light emitting materials are stacked, and the W subpixel has a configuration in which a plurality of light emitting materials are stacked. Note that when the light-emitting element is an organic light-emitting element (organic EL element), a thin display device having a relatively simple configuration can be formed.

  In the display device having the above configuration, the emission spectrum of the R + G + B subpixel group and the emission spectrum of the W subpixel are the same. Therefore, the emission spectra of the R + G + B sub-pixel group and the W sub-pixel are equal, and even in a display device using interference, the white color due to the mixture of the emission of the R + G + B sub-pixel group and the emission of the W sub-pixel. Misalignment does not occur.

<Embodiment 2>
The present embodiment relates to a display device adopting the configuration (2).

  In order to match the mixed spectrum of the light emission of the first light emitting element and the light emission of the second light emitting element with the emission spectrum of the third light emitting element, a display device as shown in FIG. 15 was manufactured. The display device shown in FIG. 15 is a display device having a sub-pixel arrangement in which R, G, and B light-emitting elements are combined with R ′, G ′, and B ′ light-emitting elements as W sub-pixels.

That is, a display device having a pixel in which the following subpixels are combined was manufactured.
(I) Sub-pixel composed of R light-emitting element (ii) Sub-pixel composed of G light-emitting element (iii) Sub-pixel composed of B light-emitting element (iv) Same spectrum as the mixed spectrum of light emission of R + G + B sub-pixel group W sub-pixel composed of R ′, G ′, B ′ light-emitting elements formed by arranging light-emitting materials

  The device structures of the R, G, B light emitting elements and the R ′, G ′, B ′ light emitting elements are as shown in FIG.

  These R, G, and B sub-pixels arranged in a plane are supplied with individual drive currents as shown in FIG. Further, as shown in FIG. 16B, three light emitting elements R ′, G ′, and B ′ serving as W sub-pixels are connected in series and simultaneously supplied with a drive current to emit light.

  As a result, the emission spectra of the R + G + B sub-pixel group and the W sub-pixel are the same, and even in a display device using interference, white light generated by mixing the light emission of the R + G + B sub-pixel group and the light emission of the W sub-pixel. Color misregistration does not occur.

  The arrangement of the sub-pixels in FIG. 15 is such that the R, G, and B sub-pixel groups and the R ′, G ′, and B ′ light-emitting elements are arranged on one side of the substrate. R ′, G ′, and B ′ light emitting elements may be disposed below the R, G, and B subpixels, respectively.

  Incidentally, when the light emitting element of this embodiment is also an organic light emitting element (organic EL element), a thin display device having a relatively simple configuration can be formed.

<Embodiment 3>
In the present embodiment, even when the viewing angle (viewing angle) of the display device changes, the emission color of the R + G + B sub-pixel group and the emission color of the W sub-pixel change in the same way. Explain that there is no degree difference.

  The chromaticity coordinates of the white light emission of the sub-pixel group and the white light emission of the W sub-pixel obtained by adding the B light-emitting element to the R, G, and B light-emitting elements having the device structure of FIG. Was measured. Tables 7 and 8 show the chromaticity coordinates of each white. When the light emission of the R, G, and B light emitting elements was mixed, the chromaticity coordinates shown in Table 3 were used. However, the light emission of the B light emitting element was mixed with the light emission of the R, G, and B light emitting elements. As a result, as shown in Table 7, the same color condition was used as in Table 8, which is the chromaticity coordinate of light emission of the W sub-pixel.

  In this case, in the display device using interference as described above, the same mixture is obtained from the mixing ratio when the chromaticity coordinates of the light emission of the R + G + B (+ B) sub-pixel and the light emission of the W sub-pixel of the same color are combined. The desired white chromaticity coordinates could not be obtained when the ratio was changed.

  Further, the viewing angle is tilted from the normal direction of the display surface, the light emission of the R + G + B (+ B) subpixel group indicated by the spectrum of FIG. 17 at 0 degrees and 60 degrees, and the W subpixel indicated by the spectrum of FIG. The chromaticity coordinates of the luminescence were measured. The results are as shown in Table 9 and Table 10, and even if the B light emitting element is added so that the chromaticity coordinates of the display device are the same color as the condition, the viewing angle is tilted from the normal direction of the display surface to interfere. When the conditions were changed, the desired white chromaticity coordinates could not be obtained.

  Therefore, as in the first embodiment, the light emission (mixed light) of the R + G + B subpixel group represented by the chromaticity coordinates shown in FIG. 1 and the light emission of the W subpixel represented by the chromaticity coordinates shown in FIG. Were placed adjacent to each other. Here, the chromaticity coordinate of light emission of the W sub-pixel in FIG. 2 is the same as the chromaticity coordinate of W in FIG. In this display device, the target white color is the chromaticity coordinate of W in FIGS.

  Hereinafter, the spectral relationship of the light emitting material having these chromaticity coordinates will be described more specifically.

  The R luminescent material had the PL spectrum shape shown in FIG. 3, the G luminescent material had the PL spectrum shape shown in FIG. 4, and the B luminescent material had the PL spectrum shape shown in FIG. Further, the PL spectrum of light emission of the R + G + B sub-pixel group has the shape shown in FIG.

  The light emission of the W subpixel is made equal to the PL spectrum of FIG. 6 in which the light emission of the R, G, and B light emitting elements is mixed at a predetermined ratio. Therefore, the chromaticity coordinates of these two types of white PL emission are the same color and the spectrum shapes are also equal, and the spectrum of the emission of the R + G + B subpixel group shown in FIG. 7 and the emission of the W subpixel shown in FIG. Become a relationship.

  In this case, in a display device using interference, it is also desirable when the mixing ratio is changed from the mixing ratio of the chromaticity coordinates of the light emission of the R + G + B sub-pixel group having the same color and the light emission of the W sub-pixel. It was possible to obtain the white chromaticity coordinates.

  Further, the viewing angle was inclined from the normal direction of the display surface, and the chromaticity coordinates of the light emission of the R + G + B subpixel group and the light emission of the W subpixel at 0 degree and 60 degrees were measured. As a result, both the light emission of the R + G + B sub-pixel group and the light emission of the W sub-pixel are as shown in Table 11. The mixed light of the spectrum of FIG. 19 is tilted from the normal direction of the display surface even if the interference condition changes. The desired white chromaticity coordinates could be obtained.

  This is because when the mixed spectrum of the R + G + B sub-pixel group changes with the viewing angle, the spectrum of the W pixel also changes. For this reason, even if the change in the emission spectrum of the R + G + B sub-pixel group and the change in the emission spectrum of the W sub-pixel are added, it changes equally with the emission spectrum of the R + G + B + W sub-pixel group.

  Incidentally, when the light emitting element of this embodiment is also an organic light emitting element (organic EL element), a thin display device having a relatively simple configuration can be formed.

<Embodiment 4>
When an imaging device (for example, a digital camera) having the display device having the above configuration as a display unit is configured, an imaging device having the above-described effects can be realized.

It is a CIE chromaticity coordinate diagram of light emission of R, G, and B light emitting elements and mixed light thereof. It is a CIE chromaticity coordinate diagram of a W light emitting element. It is a PL spectrum figure of R luminescent material. It is a PL spectrum figure of G luminescent material. It is a PL spectrum figure of B luminescent material. It is a PL spectrum figure of the mixed light of a R + G + B sub pixel group. It is a light emission spectrum figure of R + G + B sub pixel group. It is a light emission spectrum figure of W sub pixel group. It is a figure explaining the structure of a light emitting element. It is a light emission spectrum figure of R + G + B sub-pixel group of a display device using interference. It is a light emission spectrum figure of R + G + B + W sub pixel group of a display device using interference. It is a figure which shows the structure of the R + G + B sub pixel group of the vertically stacked structure using interference. It is a figure which shows the structure of W pixel of the vertically stacked structure using interference. It is a figure which shows the sub pixel arrangement | positioning of R, G, B, and W of the vertical stacked structure using interference. It is a figure which shows the sub pixel arrangement | positioning of R, G, B, W (R '+ G' + B ') of the planar structure using interference. It is a figure which shows the light emitting element drive of R, G, B, and W of a planar structure. It is the light emission spectrum figure of 0 degree and 60 degrees of the R + G + B sub pixel group of the display apparatus using interference. It is a light emission spectrum figure of 0 degree and 60 degrees of the W (B + Y) sub pixel of the display apparatus using interference. It is a light emission spectrum figure of 0 degree and 60 degrees of the R + G + B sub-pixel group and the W (B + Y) sub-pixel of the display device using interference. It is a figure which shows the conventional subpixel arrangement | positioning of R, G, B, and W. It is a figure which shows the vertical structure of the conventional display apparatus. It is an equivalent circuit diagram for driving conventional R, G, B, and W light emitting elements. It is a PL spectrum figure of W sub pixel. It is a light emission spectrum figure of W sub pixel of a display using interference. It is a light emission spectrum figure of R + G + B + W sub pixel of a display device using interference.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Substrate 11 Reflective electrode 12 Hole transport layer 13 Light emitting layer 14 Electron transport layer 15 Electron injection layer 16 Transparent electrode 26 Glass substrate 27 Reflector 20 for causing interference 20 Transparent electrode 21 Layer for injecting and transferring holes to the light emitting layer 23 B light emitting layer 24 R light emitting layer 25 G light emitting layer 22 Layer for injecting and transferring electrons from the cathode to the light emitting layer 28 Drive current supplied to the B light emitting element 29 Drive current supplied to the R light emitting element 30 G light emitting element Supplied drive current 31 Drive current supplied to W pixel 32 Transparent conductive layer

Claims (9)

Having a plurality of light emitting elements in which a reflective layer and a light emitting layer are laminated,
Each light emitting element is a display device using interference between light reflected from the light emitting layer toward the reflective layer and reflected from the reflective layer and light directed from the light emitting layer to the opposite side of the reflective layer.
The plurality of light emitting elements include a first light emitting element, a second light emitting element having a light emission color different from that of the first light emitting element, light emission of the first light emitting element and light emission of the second light emitting element. And a third light-emitting element having the same emission spectrum as the mixed spectrum. The first light emitting element and the second light emitting element are stacked on a substrate,
The third light emitting element includes a light emitting material having an emission spectrum of the first light emitting element and a light emitting material having an emission spectrum of the second light emitting element, the first light emitting element and the first light emitting element on the substrate. The display device according to claim 1, wherein a plurality of the light emitting elements are stacked on the same substrate surface. The first light emitting element and the second light emitting element are disposed on a substrate,
The third light emitting element includes a light emitting material having an emission spectrum of the first light emitting element and a light emitting material having an emission spectrum of the second light emitting element, the first light emitting element and the first light emitting element on the substrate. The display device according to claim 1, wherein a plurality of light emitting elements are arranged on the same substrate surface. A mixed spectrum of the mixed light of the light emission of the first light emitting element and the light emission of the second light emitting element, and the light emission of the third light emitting element;
The mixed spectrum of the mixed light of the light emission of the first light emitting element, the light emission of the second light emitting element, and the light emission of the third light emitting element is equal even if the viewing angle is tilted from the normal direction of the display surface. The display device according to claim 1, wherein the display device changes.   5. The display device according to claim 1, wherein an emission color of the third light emitting element is white.   6. The display device according to claim 1, wherein the light emitting element is an organic light emitting element.   An imaging apparatus comprising the display device according to claim 1 as a display unit. Having a plurality of light emitting elements in which a reflective layer and a light emitting layer are laminated,
Each light emitting element is a display device using interference between light reflected from the light emitting layer toward the reflective layer and reflected from the reflective layer and light directed from the light emitting layer to the opposite side of the reflective layer.
The plurality of light emitting elements include a first light emitting element, a second light emitting element having a light emitting color different from that of the first light emitting element, and a light emitting color different from that of the first light emitting element and the second light emitting element. And a fourth light emitting element having the same emission spectrum as the spectrum obtained by mixing the light emission of the first light emitting element, the second light emitting element, and the third light emitting element. Display device.   The emission color of the first light emitting element to the third light emitting element is red, green, and blue, respectively, and the emission color of the fourth light emitting element is white. The display device described.

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