TW200919402A - Display apparatus and imaging system using the same - Google Patents

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

200919402 IX. Description of the Invention [Technical Field] The present invention relates to a display device and an imaging system using the same. [Prior Art] Recently, development of organic electroluminescence (organic EL) has been actively conducted. For example, Japanese Patent Application Publication No. 2003-272857 discloses a white organic EL device comprising a stacked blue (B) light-emitting layer and a yellow (Y) or red (R) light-emitting layer. In addition to this, there is known a display device capable of emitting colored light, which comprises a material emitting red, green (G) and blue, and an organic layer formed and stacked on a substrate so as to be formed in a matrix form. Subpixels. There is known a color matrix type display device having a similar color configuration, the display device comprising a material that emits white (w) and an organic layer formed and stacked on a substrate to form a matrix 'R, G and B The color filters are stacked on the organic layer. Further, there is also known a matrix type display device which, in addition to the above-described R, G and B sub-pixels having a color filter, "the matrix type display device includes a W sub-pixel having no color filter" so R, G, The B and W sub-pixels implement a color device. For example, U.S. Patent No. 6,5,705, 584 discloses a display device comprising sub-pixels of more than R, 〇 and B colors. -4-200919402 US Patent No. 6,570,584 discloses a method of driving such a device, wherein the illumination of the R illumination device, the G illumination device, the B illumination device, and the W illumination device are mixed according to calculations, so that desired s color. On the other hand, Japanese Patent Application Publication No. 2006-163068 describes that 'because the chromaticity of white obtained by the luminescent material is not a true white target chromaticity in many cases, The luminescence of the RGB unit (pixel) pixels for color matching must be added to the luminescence of the unit pixels for white display. Japanese Patent Application Publication No. 2006-163068 also discloses a signal processing method in which RGB input signals are mixed when the chromaticity of the illuminating color of the W pixel is different from that of the white target chromaticity. From the above description, it may be considered that when the illuminating chromaticity of the W sub-pixel is set to the target chromaticity of the white chromaticity, so as to be suitable for the luminescent color chromaticity of the R + G + B sub-pixel group. At this time, it is not necessary to mix the luminescence of the R + G + B sub-pixel group for color matching (color matching) to the luminescence of the W sub-pixel for white display. However, in the case where no interference (interference) of light (PL illumination or the like) is used, metamerism occurs when it is used as a light-emitting color. The same color appears even when the illuminating colors are mixed. For example, preparing a "lighting, wherein the light of the light-emitting device used as a sub-pixel is mixed at a certain rate", and a light-emitting of the sub-pixel from the metamerism, although the light has a mixture with the light. The spectral shape of the spectrum has a different spectral shape in which the illumination of the light-emitting device of the -5 - 200919402 sub-pixel is mixed at a certain rate. In the following description, the "light emission, in which light is mixed as a light-emitting device of a sub-pixel at a certain rate" is simply referred to as "mixed light of a sub-pixel group", which is "sub-pixel from metamerism" Illumination, although the illumination has a spectral shape different from the spectral shape of the mixed spectrum of the illumination, wherein the illumination of the illumination device used as a sub-pixel at a certain rate is simply referred to as "subpixel from metamerism" Illumination." In addition to this, a combination of a plurality of light-emitting lights having sub-pixels having different light-emitting colors is represented by using "+". For example, the combination of the illumination of the R sub-pixel, the G sub-pixel, and the B sub-pixel is referred to as "the illumination of the R+G+B sub-pixel group." Note that the sub-pixel means a unit of a light-emitting device capable of controlling on (on) and off (emission) of light emission and gradation of light emission, the pixel being a group of sub-pixels, and means a minimum unit of color display. When those luminescences are mixed without interference, the respective luminescence of "mixed light of sub-pixel group" and "light emission of sub-pixel from metamerism" have the same CIE chromaticity chroma coordinates as their mixed light (hereinafter It is referred to as “color chromaticity coordinates”. However, in the case of using a display device interposed between the light emission from the light-emitting device and the reflected light from the reflector plate, "mixed light of sub-pixel groups" and "sub-pixels from meta-spectra "Lighting" has different chromaticity chroma coordinates. This is because in a display device including an interference structure, under certain conditions, the intensity of light due to interference has a characteristic according to wavelength. Since -6-200919402, in the case of the above-described luminescence in which different spectra of light are emitted, the spectrum after the interference is modulated such that the chromaticity coordinates calculated from the integer 値 of the spectrum are also changed. A w sub-pixel system in which different spectra of metamerism are provided as supplemental light, for example, in the case of a B + Y sub-pixel group, the 'interfered spectrum is modulated such that an integer from the spectrum The color chromaticity coordinates calculated by 値 are also changed. In addition, since the spectrums of the two kinds of light rays are different from each other', when the mixing ratio 发光 between the light emission of the R + G + B sub-pixel group and the light of the W sub-pixel is changed, the spectrum after the interference is also changed. In addition, when the viewing angle is tilted from the normal direction of the display surface such that the interference condition is changed, the chromaticity of the luminescent color of the B + Y sub-pixel group and the chromaticity of the illuminating of the W sub-pixel are Change so that they are different from each other.

In the above-mentioned Japanese Patent Application Laid-Open No. 2006-163068, in the case of the R + G + B sub-pixel group + W sub-pixel, R and/or G and/or B light is emitted for color matching. According to this control, the chromaticity of the chromaticity can match each other. However, since the spectrums of the two kinds of luminescence are different from each other, when the mixing ratio 发光 between the luminescence of the R + G + B sub-pixel group and the luminescence of the W sub-pixel is changed, the spectrum after the interference is also changed. In addition, in the same manner as the above example, when the viewing angle is tilted from the normal direction of the display surface such that the interference condition is changed, the chromaticity of the illuminating color of the r + G + B sub-pixel group and w The chromaticity of the luminescence of the sub-pixels is changed so as to be different from each other. 200919402 Therefore, even when the chromaticity coordinates of the "mixed light of sub-pixel group" and the chromaticity coordinates of the "light from the sub-pixel of the meta-spectra" are combined to form metamerism, self-interference The chromaticity chroma coordinates obtained from the display surface of the display device may deviate from the expected value when the spectrum is shifted. Note that the color filter types R, G, B, which are also described as prior art. In the W display device, the R, G, and B color filters disposed on the white matrix substrate can shorten the individual wavelength ranges. Therefore, even when the illuminating lights of the R, G, and B illuminating devices are mixed, the spectrum of the mixed light does not match the spectrum of the illuminating of the W sub-pixels without the color filter. SUMMARY OF THE INVENTION An object of the present invention is to provide a display device using interference in which ''mixed light of sub-pixels') and "light-emitting of sub-pixels from metamerism" can be mixed' so as to have the same light-emitting color. In addition, another object of the present invention is to provide an imaging system using the display device. According to the present invention, there is provided a display device comprising a plurality of light-emitting devices, wherein the light-emitting devices each comprise a reflective layer and a light-emitting layer are stacked from the light-emitting layer to the reflective layer for reflection by the light-emitting layer The light reflected by the layer is disturbed by light guided from the light emitting layer in a direction opposite to the reflective layer, and wherein the plurality of light emitting devices comprise a first light emitting device, a light-emitting device of different illuminating colors of the first illuminating device, and an emission spectrum having the same spectrum as that of the illuminating device in which the illuminating device of the first illuminating device and the illuminating device of the second illuminating device are mixed - -8-200919402 Device. According to the present invention, it is possible to obtain mixed light, but there is no chromaticity shift due to the disturbance. In other words, the mixed light of the 'sub-pixel group, and the 'light emission from the meta-spectral sub-pixels' can also be mixed in the display device using interference so as to have the same light-emitting color. The "mixed light of sub-pixels" and the "lights from sub-pixels of metamerism" are mixed, and when there is a changed mixing ratio between them, the chromaticity coordinates of the light obtained after the interference are not Furthermore, even when the interference condition changes due to the inclination of the normal direction of the display surface, the chromaticity coordinates of the light obtained after the interference do not change. Other features and aspects of the present invention will The following is a description of a representative embodiment of the accompanying drawings. [Embodiment] A display device and an imaging system using the same are described. The display device according to the present invention and the use of the display device are described. Before the imaging system, first confirm the problem of the above related display device. The R, G, B and W illuminating devices having the vertical structure exemplified in Fig. 21 are manufactured. To realize the configuration of the sub-pixels illustrated in Fig. 20. Here, 'number 21 denotes a TFT substrate, numeral 22 denotes a TFT, numeral 23 denotes a drain, numeral 24 denotes a source, numeral 25 denotes an anode, and numeral 26 denotes 200919402 Hole transport layer, numeral 27 denotes electron transport layer, numeral 28 denotes device isolation layer, numeral 29 denotes R organic layer, numeral 3 denotes cathode, numeral 31 denotes G organic layer, numeral 32 denotes b organic layer, numeral 33 denotes white Layers and numbers represent polarized light (P〇larizati〇n) films. Zhuangyi 'those illuminators are controlled to have independent illuminances, as exemplified in Figure 22. R, G, B and W illuminators Each has a device structure as exemplified in Fig. 9. Here, numeral 10 denotes a glass substrate, numeral n denotes a metal anode (reflective electrode) having a reflective property, numeral 12 denotes a hole transport layer, numeral 13 denotes a light-emitting layer, and numerals 14 denotes an electron transport layer, numeral 15 denotes an electron injection layer, and numeral 16 denotes a transparent conductive cathode (transparent electrode). When electrons and holes in the light-emitting layer are recombined, the light-emitting device The light that is unique to the material is emitted. At this time, since the light emitted to the transparent electrode 16 interferes with the light from the reflective electrode 11, the light from the transparent electrode 16 becomes the PL light color having the material itself. Different luminescent colors. R luminescent material having the PL (photoluminescence) spectral shape exemplified in FIG. 3, G luminescent material having the PL spectral shape exemplified in FIG. 4, and having the exemplified in FIG. The B luminescent material of the PL spectrum shape is used as the luminescent layer 13 of the R, G, and B illuminating devices (sub-pixels), respectively. On the other hand, the W luminescent material having the PL spectral shape exemplified in Fig. 23 is used. The light-emitting layer 13 of the W sub-pixel. The material of the light-emitting layer 13 of the 'W sub-pixel is prepared by mixing the B and Y luminescent materials to be used in order to make the PL spectrum as shown in FIG. The shape of the example. When the interference effect is not considered, the chromaticity coordinates of the white PL illumination of the two types (the illumination of the R+G+B sub-pixel group and the illumination of the B+Y sub-pixel (W sub-pixel)) have the same table. Metamerism as exemplified in 1 and 2. Table 1 X Y 0.321608939 0.334687128

R+G+B Table 2 XY 0.321608939 0.334687128 Measure the chromaticity coordinates of the chromaticity coordinates of the luminescence of the R + G + B sub-pixel group and the illumination of the W sub-pixels considered for the interference effect Examples are shown in Tables 3 and 4. Table 3 X Y 0.29981 0.3501

R+G+B (with interference) Table 4 X Y 0.31428 0.38418

B+Y has interference) When the interference effect is not considered in the PL illumination of the material itself, the illumination of the R+G+B sub-pixel group and the illumination of the W sub-pixel have the same-color chromaticity chroma coordinates. However, as for the light from -11 - 200919402 sub-pixels considered for the interference effect, the chromaticity chromaticity coordinates of the luminescence of the R + G + B sub-pixel group deviate from the chromaticity chromaticity coordinates of the illuminating of the W sub-pixel . Therefore, when the illumination of the heterochromic R+G+B sub-pixel group is only mixed with the illumination of the W sub-pixel, the display device using the interference cannot obtain the desired white chromaticity coordinate coordinate. . The spectrum of the luminescence of the R + G + B sub-pixel group after the interference is exemplified in Fig. 10, and the spectrum of the illuminating of the W sub-pixel after the interference is exemplified in Fig. 24. When those spectra are mixed, luminescence to the spectrum as exemplified in Fig. 25 can be obtained. Since this shape is different from the respective shapes of the shapes exemplified in Figs. 10 and 24, it can be understood that the desired color chromaticity coordinates of the white color cannot be obtained. Accordingly, the display device of the present invention includes a plurality of light emitting devices including a stacked reflective layer and a light emitting layer, wherein each of the light emitting devices uses light that is guided from the light emitting layer to the reflective layer to be reflected by the reflective layer and the reflective layer In the opposite direction, the interference between the light from the light-emitting layer is guided. In addition, the display device has a structure including a first light emitting device, a second light emitting device having a different color of light emitted from the first light emitting device, and a light having a first light emitting device mixed therein a third illumination device having the same emission spectrum as the spectrum of the illumination of the second illumination device. In other words, the spectrum of the illumination obtained by mixing the illumination of the first illumination device and the illumination of the second illumination device (ie, the "mixed light of the sub-pixel group") has substantially the illumination of the third illumination device ( That is, the spectrum of "light emission from sub-pixels of metamerism" has the same shape. The specific method for realizing the above structure is as follows. -12- 200919402 (1) The first light-emitting device and the second light-emitting device are continuously stacked on the substrate, and the third light-emitting device is disposed on the substrate. (2) the first illuminating device, the second illuminating device, and the third illuminating device are disposed on the substrate. The third illuminating device is composed of a luminescent material having an emission spectrum of the first illuminating device and an emission spectrum having the second illuminating device. Made up of luminescent materials. In the above structure (2), that is, the sub-pixels of the first light-emitting device and the second light-emitting device are separately disposed, and the sub-pixels are connected to each other to constitute the third light-emitting device. Note that the structures of the first light-emitting device, the second light-emitting device, and the third light-emitting device are not limited to the above-described structures, and it is possible to obtain "third by combining luminescent materials having the same spectrum as the "mixed light of sub-pixels" The illumination of the illuminating device". Here, the same spectrum (shape) means a condition in which the number of peaks of the light-emitting wavelength is between "the mixed light of the sub-pixel group, and the "light emission from the sub-pixel of the meta-spectrum" The same, all peak wavelengths are within ±5 nm, and all half of their width is within ±5 nm. In each of the embodiments described below, the R and G illuminators are respectively The first light-emitting device and the second light-emitting device are used, and the B-light-emitting device is added. Further, the W light-emitting device is used as the third light-emitting device. (Example 1) This example relates to a display device having the above structure (1) -13- 200919402 The R+G+B sub-pixel group of the R, G and B illuminators exemplified in the chromaticity coordinates of Figure 1 and the chromaticity coordinates of Figure 2 The W sub-pixels are arranged side by side in the area of the display surface. Here, the chromaticity coordinate coordinate of the W sub-pixel exemplified in FIG. 2 and the chromaticity of the W sub-pixel exemplified in FIG. The chroma coordinates are the same. In this display device, the target white has the same in Figure 1 and Figure 2. The color chromaticity coordinates are hereinafter described. In the following, the relationship between the spectra of the luminescent materials of the chromaticity coordinates will be described in more detail. The R luminescent material has the PL spectrum shape exemplified in Fig. 3, and the G luminescent material has The PL spectrum shape illustrated in Fig. 4, and the B luminescent material has the PL spectrum shape exemplified in Fig. 5. In addition, the PL spectrum of the luminescence of the R + G + B sub-pixel group has the spectrum of Fig. 6 The shape of the W sub-pixel is adapted to have the same spectrum as the PL spectrum exemplified in Fig. 6, wherein the illumination of the R, G and B illumination devices is mixed at a predetermined ratio. The chromaticity chroma coordinates of the two types of white PL luminescence are metamerism and have the same spectral shape, which is the luminescence of the R+G+B sub-pixel group exemplified in FIG. The relationship between the spectrums of the illuminations of the W sub-pixels is exemplified. Those materials are used to fabricate the light-emitting device having the device structure illustrated in Fig. 9 and using interference. The R, G, and B light-emitting devices having the above-described device structure are included. White light of R+g+B sub-pixel group and white light of W sub-pixel The spectrum of light has the shape exemplified in Fig. 10. The chromaticity coordinates of each chromaticity are measured, and the chromaticity of the chromaticity of the chromaticity of the white is found to be the same as in the following, as shown in Table 5. Table 5 XY 0.31871 0.3892 R+G+B (with interference) On the other hand, the spectrum of the mixed light after interference has the shape as illustrated in Figure n. The white color of this spectrum The coordinate system is shown in Table 6. Table 6 XY 0.31871 0.3892 R+G+B+W Interference) Thus, when the spectrum shape is the same, the white coordinates are not offset from the illumination system of the W sub-pixel. When the illuminating phase of the R + G + B sub-pixel group is disturbed, this can also be applied to the case of illuminating the W sub-pixel representing the above-described spectral shape exemplified in FIG. 23, and the same effect can be obtained. Obtained when the other sub-pixels contain B and gamma illumination devices such that their mixed spectrum can be the same. As can be appreciated from this, the number of sub-pixels can be 1, 2, ... n (n is an integer) as long as the colors are mixed to produce another color. The structure described below is employed to match the mixed spectrum of the illumination of the first illumination device and the illumination of the second illumination device to the spectrum of illumination of the third illumination device. That is, a display device having pixels of the following structure is fabricated. Like -15-200919402, a combination of sub-pixel groups and W-lighting devices, in which the 'R, G, and B illuminators as exemplified in FIG. 12 are stacked vertically, and In the light-emitting device, as exemplified in FIG. 13, luminescent materials having the same spectrum as the mixed spectrum of the luminescence of the R+G+B sub-pixel group are stacked. Figure I4 illustrates the configuration of the sub-pixels of the display device, and two pixels are configured here for ease of understanding. In the figure, numeral 26 denotes a glass substrate, numeral 27 denotes a reflector plate for causing interference, and numeral 32 denotes a transparent conductive layer made of a transparent oxide conductive material such as I Τ or IZ ,, numerals 20 denotes a transparent electrode 'number 21 denotes a layer for injecting and transferring a hole in the light-emitting layer, numeral 23 denotes a B light-emitting layer, and numeral 24 denotes an R light-emitting layer. Numeral 25 denotes a G luminescent layer, and numeral 22 denotes a layer for injecting and transferring electrons from the cathode in the luminescent layer, numeral 28 denotes a driving current to be supplied to the B illuminating device, and numeral 29 denotes a supply to be supplied to the R illuminating The drive current of the device, numeral 30 indicates the drive current to be supplied to the G light-emitting device, and numeral 31 indicates the drive current to be supplied to the W sub-pixel. In other words, the R+G+B sub-pixel group has a structure of stacked luminescent materials' and the w sub-pixels also have a structure of stacked luminescent materials. Note that the light-emitting device may be an organic light-emitting device (organic EL element), so that a thin display device having a relatively simple structure can be formed. In the display device having the above structure, the mixed spectrum of the light emission of the 'R+G+B sub-pixel group is the same as the spectrum of the light emission of the W sub-pixel. Therefore, the light emission of the R+G+B sub-pixel group and the light emission of the W sub-pixel have the same spectrum as -16-200919402. As a result, even a display device using interference does not cause a white shift due to the mixing of the light of the r+g+b sub-pixel group and the light emission of the w sub-pixel. (Example 2) This example relates to a display device having the above structure (2). In order to match the mixed spectrum of the illumination of the first illumination device and the illumination of the second illumination device with the emission spectrum of the third illumination device, a display device having a configuration of sub-pixels is produced, in the configuration of the sub-pixel, R, G And the B illuminating device and the R', G' and B' illuminating devices as W sub-pixels are combined as exemplified in FIG. In other words, the manufactured display device has pixels, each pixel being a combination of sub-pixels including R, G, and B light-emitting devices and W sub-pixels including R', G', and B' light-emitting devices, wherein R+G is disposed. +B sub-pixel group illuminating mixed spectrum of luminescent material of the same spectrum. The R, G and B illuminators and the R', G' and B' illuminators have the device structure as exemplified in Fig. 9. The R, G, and B sub-pixels disposed on a plane are supplied with individual drive currents, as exemplified in Fig. 16A for illumination. In addition, the R', G' and B' illuminating devices as W sub-pixels are connected in series, and at the same time, a driving current is supplied, as exemplified in Fig. 16B, to emit light. Therefore, the illumination of the R+G+B sub-pixel group and the illumination of the W sub-pixel have the same spectrum' and, due to the mixture of the -17-200919402 illumination of the R+G+B sub-pixel group and the illumination of the W sub-pixel Even a display device that uses interference does not cause a white offset. According to the configuration of the sub-pixels illustrated in FIG. 15, although the R, G, and B sub-pixels and the R, G', and B' light-emitting devices are disposed on one side of the substrate, it is possible to use R', G'. And the B' illuminating device is disposed on the other side of the substrate at individual locations below the R, G, and B sub-pixels. The light-emitting device of this example may also be an organic light-emitting device (organic EL device), so that a thin display device having a relatively simple structure can be formed. (Example 3) This example describes that even when the angle (viewing angle) of the viewing display device is changed, 'because the illuminating color of the R+G+B sub-pixel group and the illuminating color of the W sub-pixel are changed in the same manner, the illuminating color There will be no difference in chroma color between the colors. Similar to the above description, the R, G, and B illuminating devices including the device structure exemplified in FIG. 9, the white illuminating of the sub-pixel group using the interference effect with the additional B illuminating device, and the white illuminating of the W sub-pixel are measured. The chromaticity chromaticity coordinates and the white luminescent chromaticity coordinates are exemplified in Tables 7 and 8, respectively. In the case where the luminescence of the R, G, and B illuminators is mixed, the chromaticity chroma coordinates are as exemplified in Table 3. Conversely, when the luminescence of the B illuminating device is further mixed with the illuminating of the R, G and B illuminating devices, the homochromatic spectroscopy exemplified in Table 7 is obtained, which is the luminescence of the sub-pixels exemplified in Table 8. The chromaticity coordinates are the same. -18- 200919402 Table 7 X Y 0.31428 0.38418 R+G+B (with interference) Table 8 X Y 0.31428 0.38418

B+Y (with interference) In this case, in the display device using the interference as described above, the illumination of the W sub-pixel in the luminescence and metamerism from the R+G+B(+B) sub-pixel In the case where the combination of the chromaticity coordinates of the chromaticity changes the mixing ratio, the desired chromaticity chromaticity coordinates cannot be obtained. In addition, the viewing angle is inclined from the normal direction of the display surface, while measuring the R+G+B(+B) of the spectrum exemplified in Fig. 17 at the twist and 60 degrees. The illuminance of the pixel group and the chromaticity chromaticity coordinates of the luminescence of the w sub-pixels of the spectrum exemplified in FIG. 18 are indicated at the twist and 60 degrees. Even when the B illuminating device is added such that the chromaticity chroma coordinates of the display device become metameric, 'the chromaticity coordinates of the desired white color cannot be obtained when the viewing angle is inclined from the normal direction of the display surface. When the disturbance condition is changed. Table 9 X -| Y 0.3 0.31428 0.38418 60 degrees 5729 ~~ 0.32267 R+G+B (with interference) Table 10 X ' ^ Y 0.3 0.314T8 0.38418 60 degrees 0.28? 9~~~~ 0.32223

B+Y (with interference) -19- 200919402 Therefore, as exemplified in the above example 1, the combination of the R+G+B sub-pixel group of the illustrated chromaticity chroma coordinates is configured. The illumination is adjacent to the W sub-pixel labeled with the color chromaticity exemplified in FIG. 2. Here, the color chromaticity coordinate system of the W sub-light exemplified in Fig. 2 is the same as the W color standard exemplified in Fig. 1. In this display device, the white color currently has the W color chroma coordinates of Fig. 1 and the illustration. In the following, the relationship of the spectrum between the chrominance coordinates will be described in more detail. The R luminescent material has the PL spectral shape exemplified in Fig. 3, the optical material has the PL spectral shape exemplified in Fig. 4, and the B luminescence has the PL spectral shape exemplified in Fig. 5. In addition, the illuminating PL spectrum of the R-sub-pixel group has the illuminating system of the W sub-pixel exemplified in FIG. 6 adapted to have the same spectrum as that exemplified in FIG. 6 where R The G and B illuminators are mixed in a ratio of luminescence. Therefore, the two types of white PL illuminance chroma coordinates are metamerism and have the same spectral shape, wherein the illuminating R+G+B sub-pixel group and the W sub-pixel of FIG. The relationship between the spectrum of the light. In this case, the display ratio using the interference as described above also changes the blending ratio after the combination of the chromaticity coordinates between the luminescence of the R+G+B sub-pixel and the luminescence of the h in the metamerism. In the 'can get the desired color chromaticity coordinates. In addition, the 'viewing angle is the light that is inclined from the normal direction 1 of the display surface (the light material in the chromatographic seat 2 of the mixed coordinate pixel, the G luminescent material f G + B. The PL frequency is in the pre-color Figure 7 shows the case of sub-pixels in the example of the sub-pixel, and measured at twentieth and 60 degrees at -20-200919402, the luminescence of the R + G + B sub-pixel group and the enthalpy and 60 degrees The chromaticity chroma coordinates of the light of the w sub-pixels. The results of the light emission of the R+G+B sub-pixel group and the light emission of the W sub-pixel are exemplified in Table 11. As for the image in FIG. The mixed light of the exemplary spectrum 'even when the viewing angle is tilted from the normal direction of the display surface, the desired white chromaticity chroma coordinates can be obtained, so that the interference conditions change. Suitable because when R+G When the mixed spectrum change of the +B sub-pixel group changes with the angle of view, the spectrum of the W pixel also changes similarly. Therefore, even when the mixed spectrum of the illumination of the R + G + B sub-pixel group is changed with the W sub-pixel When the changes in the spectrum of the luminescence are summed together, the spectrum of the W pixels is combined with the R + G + B sub-pixels. The mixed spectrum of the group's illumination changes in the same way. Table 11 X Y 0.3 0.31871 0.3892 60 degrees 0.29 0.32267 (with interference) R+G+B+Y (with interference)

R+G+B The light-emitting device of this example may also be an organic light-emitting device (organic EL element), so that a thin display device having a relatively simple structure can be formed. (Example 4) It is possible to manufacture an imaging system (e.g., a digital camera) and a display device having the above structure of -21 - 200919402 as a display member, so that an imaging system having the above-described effects can be realized. While the invention has been described with respect to the preferred embodiments of the embodiments of the invention, the invention Corrected and equivalent structure and function. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a CIE chromaticity coordinate coordinate diagram of the illuminating light of the R, G, and B illuminating devices and the mixed light thereof. Fig. 2 is a CIE color chroma coordinate diagram of the W light-emitting device. Figure 3 is a PL spectrogram of the R luminescent material. Figure 4 is a PL spectrogram of a G luminescent material. Figure 5 is a PL spectrogram of a B luminescent material. Figure 6 is a PL spectrogram of mixed light of a group of R + G + B sub-pixels. Figure 7 is an emission spectrum diagram of a group of R + G + B sub-pixels. FIG. 8 is an emission spectrum diagram of a W sub-pixel group. Fig. 9 is a view showing a structure of a light-emitting device. Figure 10 is a graph of the emission spectrum of a R+G+B sub-pixel group in a display device using interference. Figure 11 is a diagram of the emission spectrum of a group of R+G+B+W sub-pixels in a display device using interference. Figure 12 is a diagram illustrating the structure of an R+G + B sub-pixel group having interference, a vertically stacked structure. -22- 200919402 Fig. 13 is a diagram showing a structure using interference, a W pixel having a vertical stacked structure. Fig. 14 is a diagram showing a configuration using interference, R, G, B, and W sub-pixels having a vertical stack structure. Fig. 15 is a diagram showing the configuration of a sub-pixel using R, G, B and W (R ' + G ' + B '') having interference, a planar structure. Fig. 16 is a view showing the driving of the R, G, B and W light-emitting devices having a planar structure. Figure 17 is a diagram showing the emission spectrum of a group of R + G + B ( + B) sub-pixels of the device using the interference at 0 degrees and 60 degrees. Fig. 18 is a diagram showing an emission spectrum of a W (B + Y) sub-pixel of a display device using interference at 0 degrees and 60 degrees. Fig. 19 is a diagram showing emission spectra of r+G+Β sub-pixel groups and W(B+Y) sub-pixels of a display device using interference at 0 and 60 degrees. Fig. 20 is a diagram showing an arrangement of related configurations of R, G, B and W sub-pixels. Figure 2 is a diagram showing the relative vertical structure of the display device. Figure 22 is a diagram of an equivalent circuit for driving associated R, G, B and W illumination devices. Figure 23 is a PL spectrum diagram of a W sub-pixel. Figure 24 is a diagram showing the emission spectrum of W sub-pixels in a display device using interference.

Fig. 25 is a diagram showing an emission spectrum of R+G+B+W -23- 200919402 sub-pixels in a display device using interference. [Description of main component symbols] 1 〇: glass substrate 1 1 : metal anode 1 2 : hole transport layer 1 3 : light-emitting layer 14 : electron transport layer 1 5 : electron injection layer 1 6 : transparent conductive cathode (transparent electrode) 21 : TFT substrate 22 : thin film transistor 2 3 : drain 24 : source 2 5 : anode 26 : hole transport layer 27 : electron transport layer 2 8 : device isolation film 29 : R organic layer 3 0 : cathode 3 1 : G organic layer 3 2 : B organic layer 3 3 : white organic layer 3 4 _·polarized film-24- 200919402 2 6 : glass substrate 2 7 : reflector 3 2 : transparent conductive layer 2 0 : transparent electrode 2 1 : layer 23 for injecting and transferring holes in the light-emitting layer: B light-emitting layer 24: R light-emitting layer 2 5 : G light-emitting layer 22: layer for injecting and transferring electrons from the cathode into the light-emitting layer 2 8 : The driving current 29 to be supplied to the B light-emitting device: the driving current 3 0 to be supplied to the R light-emitting device: the driving current 3 1 to be supplied to the G light-emitting device: the driving current to be supplied to the W sub-pixel -25 -

Claims (1)

200919402 X. Patent Application Area 1. A display device comprising a substrate and a plurality of light-emitting devices, wherein: the light-emitting devices each comprise a reflective layer and a light-emitting layer stacked, from which the light-emitting layer is guided to a reflective layer for interference between light reflected by the reflective layer and light guided from the light-emitting layer in a direction opposite to the reflective layer; and the plurality of light-emitting devices including a first light-emitting device, a second illuminating device having a different illuminating color from the first illuminating device, and a third illuminating device having an emission spectrum identical to a spectrum in which the illuminating light of the first illuminating device and the illuminating portion of the second illuminating device are mixed . 2. The display device of claim 1, wherein: the first illuminating device and the second illuminating device are continuously stacked on the substrate; and the third illuminating device is disposed on the substrate. 3. The display device of claim 1, wherein the first illuminating device, the second illuminating device, and the third illuminating device are respectively disposed on the substrate. 4. The display device of claim 1, wherein the illumination of the first illumination device and the illumination of the illumination of the second illumination device are different when the viewing angle is inclined from a normal direction of the display surface The mixed spectrum of the illumination of the three illumination devices is changed in the same manner as the change in the mixed spectrum of the illumination of the first illumination device, the illumination of the second illumination device, and the illumination of the illumination of the third illumination device. -26-200919402. The display device of claim 1, wherein the third illuminating device has a white color. 6. The display device of claim 1, wherein the illuminating device is an organic illuminating device. An imaging system comprising the display device as in the first aspect of the patent application as a display member. 8. A display device comprising a plurality of illumination devices, wherein: each of the illumination devices comprises a reflective layer and a light-emitting layer stacked, from which the light-emitting layer is guided to the reflective layer for use by the reflective layer The reflected light is interfered with light guided from the light emitting layer in a direction opposite to the reflective layer; and the plurality of light emitting devices comprise a first light emitting device, one having a different color from the first light emitting device a second illuminating device of the illuminating color, a third illuminating device having a illuminating color different from the first illuminating device and the second illuminating device, and a first illuminating device and the second illuminating device And a fourth illumination device of the emission spectrum of the same spectrum as the illumination of the third illumination device. 9. The display device of claim 8, wherein the illumination colors of the illumination device, the second illumination device, and the third illumination device are red, green, and blue, respectively, and the fourth illumination device The illuminating color is white. -27-