JP4293327B2 - Hologram color filter and image display device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hologram color filter and an image display device using the same, and more particularly to a hologram color filter suitable for a reflective image display device, the hologram color filter, a polymer dispersed liquid crystal display element, and a digital micromirror device type The present invention relates to a reflective image display device combined with a spatial light modulator such as a display element.
[0002]
[Prior art]
In the Japanese Patent Application No. 5-12170, the present applicant has proposed a color filter using a hologram and a liquid crystal display device using the same in order to greatly improve the utilization efficiency of a backlight for liquid crystal display.
[0003]
This hologram color filter is composed of an eccentric Fresnel zone plate-shaped micro hologram array.
[0004]
Hereinafter, a liquid crystal display device using a hologram color filter composed of such an eccentric Fresnel zone plate-shaped micro hologram array will be described with reference to a sectional view of FIG. In the figure, a hologram array 5 constituting this hologram color filter is arranged at a distance from the backlight 3 incident side of a liquid crystal display element 6 regularly divided into liquid crystal cells 6 '(color separation pixels). On the back surface of the liquid crystal display element 6, a black matrix 4 provided between the liquid crystal cells 6 'is disposed. In addition to the above, polarizing plates (not shown) are disposed on both sides of the liquid crystal display element 6. In addition, an absorption color filter that passes light of colors corresponding to R, G, and B color separation pixels is additionally arranged between the black matrix 4 as in the conventional color liquid crystal display device. You may do it.
[0005]
The hologram array 5 corresponds to the repetition period of the color separation pixels of R, G, and B, that is, the repetition pitch corresponding to each set of three liquid crystal cells 6 'adjacent in the direction in the plane of the liquid crystal display element 6. The micro holograms 5 'are arranged in an array at the same pitch. The micro holograms 5' are arranged in groups of three liquid crystal cells 6 'adjacent to each other in the direction of the surface of the liquid crystal display element 6 and arranged one by one. Each of the micro-holograms 5 ′ has three components corresponding to the micro-hologram 5 ′ with the green component light in the backlight 3 incident at an angle θ with respect to the normal line of the hologram array 5. In order to condense on the liquid crystal cell G in the center of the color separation pixels R, G, B, it is formed in a Fresnel zone plate shape as schematically shown in FIG. In FIG. 6, for example, a region surrounded by a dotted line is used as the minute hologram 5 ′. The micro-hologram 5 'is formed of a transmission type hologram such as a relief type, a phase type, and an amplitude type, which has little or no wavelength dependency of diffraction efficiency. Here, the fact that the diffraction efficiency has no or little wavelength dependency means that it is not a type that diffracts only a specific wavelength and hardly diffracts other wavelengths like a Lippmann hologram. The diffraction grating whose diffraction efficiency is less dependent on the wavelength diffracts in substantially the entire visible light range with different diffraction angles depending on the wavelength.
[0006]
Because of such a configuration, when the white backlight 3 incident at an angle θ with respect to the normal line is incident from the surface of the hologram array 5 opposite to the liquid crystal display element 6, it depends on the wavelength. The diffraction angles by the micro-hologram 5 ′ are different, and the condensing position for each wavelength is dispersed in a direction substantially parallel to the surface of the hologram array 5. Among them, the red wavelength component is at the position of the liquid crystal cell R that displays red, the green component is at the position of the liquid crystal cell G that displays green, and the blue component is at the position of the liquid crystal cell B that displays blue. By arranging the hologram array 5 so as to be diffracted and condensed, each color component passes through each liquid crystal cell 6 'with almost no attenuation in the black matrix 4, and the liquid crystal cell 6' at the corresponding position is passed through. Color display according to the state can be performed.
[0007]
As described above, by using the hologram array 5 as a color filter, each wavelength component of the conventional color filter backlight can be incident on each liquid crystal cell 6 'without absorption without any waste. Can be improved.
[0008]
The present applicant has also proposed a reflection type image display apparatus using the hologram color filter as described above in Japanese Patent Application No. 8-95289. The reflection type image display apparatus will be described with reference to the cross-sectional view of FIG.
[0009]
In this example, a polymer dispersed liquid crystal (PDLC) display element 31 is used as a spatial light modulator. In the figure, the hologram color filter 5 is arranged on the front side (observation side) of the PDLC display element 31 regularly divided into color separation pixels 31 ′. A reflective layer 32 such as an aluminum film is disposed on the back surface of the PDLC display element 31. A black matrix (not shown) (see FIG. 8) is arranged between the color separation pixels 31 ′ of the PDLC display element 31. The distance between the hologram color filter 5 and the reflective layer 32 is selected to be approximately equal to the condensing distance (focal length) of the minute hologram 5 ′.
[0010]
Also in this case, the hologram color filter 5 has the repetition period of the R, G, and B color separation pixels of the PDLC display element 31, that is, the three color separation pixels 31 ′ adjacent to each other in the direction in the drawing of the PDLC display element 31. Corresponding to each set, it consists of minute holograms 5 ′ arranged in an array at the same pitch as the repetition pitch, and the minute hologram 5 ′ is adjacent to the direction of the PDLC display element 31 in the plane of the paper, and the three color separation pixels 31. 'One piece is arranged corresponding to each group, and each micro-hologram 5' is a green component in the illumination light 33 incident at an angle θ with respect to the normal line of the hologram color filter 5. It is also formed in a Fresnel zone plate shape so that the light 34G is condensed in the vicinity of the color separation pixel G at the center of the three color separation pixels R, G, B corresponding to the minute hologram 5 '. It is.
[0011]
With this arrangement, when the white illumination light 33 is incident at an incident angle θ from the surface side of the hologram color filter 5, the wavelength is dispersed by the hologram color filter 5, and the condensing position for each wavelength is the surface of the hologram color filter 5. It is distributed in the direction parallel to. Among them, the red wavelength component 34R is in the vicinity of the surface of the reflection layer 32 at the position of the color separation pixel R displaying red, and the green component 34G is the surface of the reflection layer 32 at the position of the color separation pixel G displaying green. By arranging the hologram color filter 5 so that the blue component 34B is diffracted and condensed in the vicinity of the surface of the reflection layer 32 of the color separation pixel B displaying blue, each color component is black, It passes through each color separation pixel 31 ′ with almost no attenuation by the matrix, is reflected by the reflection layer 32, passes through the corresponding color separation pixels R, G, B again from the back side, and further enters the hologram color filter 5. Then, the transmitted light 35R, 35G, and 35B is hardly diffracted by the hologram color filter 5 and is incident on the eyes of the observer. Therefore, the components 34R, 34G, and 34B of the respective colors are incident on the pixels R, G, and B that display red, green, and blue, respectively, and are subjected to intensity modulation according to the display state of these color-separated pixels, and then the eyes of the observer Therefore, it is possible to display a color image by combining the modulation states of the color separation pixels R, G, and B.
[0012]
Here, the PDLC display element 31 performs display by controlling the white turbid state and the transparent state by turning on and off the voltage, and does not require a polarizing plate. Therefore, the PDLC display element 31 is more than a normal liquid crystal display element such as a TN liquid crystal display element. Bright display is possible. In addition, since the hologram color filter 5 with high utilization efficiency of the illumination light 33 is used for color image display, brighter color image display is possible.
[0013]
It has also been proposed to use a digital micromirror device (DMD) instead of the PDLC display element as the spatial light modulator. FIG. 10 is a cross-sectional view showing an example in which a digital micromirror device (DMD) 37 is used as a spatial light modulator arranged on the back side of the hologram color filter 5, and the red diffraction component 34 </ b> R dispersed by the hologram color filter 5. The DMD 37 is arranged so that the micro mirror 38 of the DMD 37 is positioned near the position where the green diffraction component 34G and the blue diffraction component 34B are condensed. With such an arrangement, since the positions of the color separation pixels R and B are modulated, the reflected lights 35R and 35B are reflected in a predetermined direction, whereas the color separation pixel G is not modulated. The reflected light 35G is reflected in a direction different from the reflected lights 35R and 35B. Therefore, for example, by observing from the direction of the reflected light 35R, 35B, a color image can be observed, and a bright color image can be displayed.
[0014]
[Problems to be solved by the invention]
In the case of a reflective image display device using a hologram color filter composed of an eccentric Fresnel zone plate-shaped micro hologram array as shown in FIGS. 9 and 10, the reflected light from the reflective layer 32 or the micro mirror 38 is a hologram. Re-enter the array 5. At this time, most of the light is re-diffracted by the hologram array 5 and returns to the incident direction. Although the diffracted light beam can be used for display, there is a problem that the image is distorted because the emission angle becomes oblique.
[0015]
Further, as in the example of FIGS. 9 and 10, if the diffracted light dispersed by the hologram array 5 is designed to be inclined to some extent within the incident surface, the light re-entering the hologram array 5 can be designed at the designed incident angle ( Since it deviates from the Bragg angle), it is not diffracted. However, in this case, the divergence angle of the light source itself of the illumination light 33 is added to the dispersion angle, and further, the angle corresponding to the above-described inclination, and the display lights 35R, 35G, and 35B are emitted in a greatly inclined direction. The image will be distorted. In addition, when performing projection display, it is necessary to use an extremely large projection lens.
[0016]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to display a projection light that is not re-diffracted by a hologram array and can be observed without distortion almost from the front. To provide a reflective image display device that does not require a projection lens having a large aperture and a hologram color filter used therefor.
[0017]
[Means for Solving the Problems]
The hologram color filter of the present invention that achieves the above object has a condensing function and a spectral function in the incident plane direction of obliquely incident illumination light, and a micro-hologram having the same characteristics that has a deflection function in a direction perpendicular to the incident plane. Are two-dimensionally arranged in an array.
[0018]
In this case, it is desirable that the micro-hologram has a condensing function in addition to a deflection function in a direction perpendicular to the incident surface.
[0019]
Further, the minute hologram can be cut out from the eccentric region of the condensing hologram.
[0020]
Further, the arrangement period of the minute holograms may be such that adjacent minute holograms in a direction perpendicular to the incident surface are shifted in a direction parallel to the incident surface.
[0021]
Further, the minute hologram can be formed of a hologram having convergence only in a direction inclined with respect to the incident surface.
[0022]
An image display device using the hologram color filter of the present invention that achieves the above object has an illumination light source and a condensing function and a spectral function in the direction of the incident surface of illumination light obliquely incident from the illumination light source. In the direction perpendicular to the hologram color filter in which micro-holograms having the same characteristics having a deflection function are two-dimensionally arranged in an array, a reflective layer disposed in the vicinity of the condensing surface, the hologram color filter, And a transmissive spatial light modulator disposed between the reflective layers.
[0023]
In this case, it is desirable that the arrangement period of the pixels of the transmissive spatial light modulator is shifted by at least a half pixel with respect to the arrangement period of the minute holograms of the hologram color filter in the direction perpendicular to the incident surface.
[0024]
Further, as the transmissive spatial light modulator, a polymer dispersion type liquid crystal display element that controls a white turbid state and a transparent state by applying and releasing a voltage can be used.
[0025]
An image display device using another hologram color filter of the present invention has an illumination light source and a condensing function and a spectral function in the direction of the incident surface of illumination light obliquely incident from the illumination light source, and is perpendicular to the incident surface. In each direction, the tilt angle can be controlled independently by a hologram color filter in which micro-holograms with the same characteristics having a deflection function are two-dimensionally arranged in an array and an external signal placed in the vicinity of the condensing surface. It is characterized by comprising a digital micromirror device type display element comprising a two-dimensional array of possible micromirrors.
[0026]
In these image display apparatuses, the reflected light may be enlarged and projected by a projection optical system.
[0027]
In the present invention, the hologram color filter has a condensing function and a spectroscopic function in the direction of the incident surface of the obliquely incident illumination light, and a two-dimensional micro-hologram having the same characteristics having a deflection function in the direction perpendicular to the incident surface. Therefore, the light dispersed by the wavelength dispersion reflected by the reflection layer disposed in the vicinity of the condensing surface of the hologram color filter is not re-diffracted by the hologram color filter, and is substantially omitted. If the reflection type image display device is configured by combining this with a spatial light modulator, an image can be observed almost without distortion from the front, and a projection lens with a large aperture can be used for projection display. A bright image can be projected without causing a decrease in light utilization efficiency.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
First, the principle of the hologram color filter of the present invention and an image display apparatus using the same will be described.
[0029]
As shown in FIG. 4, the Fresnel zone plate-shaped condensing hologram ZPH is arranged on the YZ plane, and the center axis thereof is arranged to coincide with the Z axis. This Fresnel zone plate-shaped condensing hologram ZPH is composed of a relief type, phase type, amplitude type, or other transmission type hologram which has no or little wavelength dependency of diffraction efficiency, as in the prior art. Here, the fact that the diffraction efficiency has no or little wavelength dependency means that it is not a type that diffracts only a specific wavelength and hardly diffracts other wavelengths like a Lippmann hologram. The diffraction grating whose diffraction efficiency has little wavelength dependency diffracts at different diffraction angles depending on the wavelength. The focal length of the condensing hologram ZPH with respect to green light is f.
[0030]
A plane mirror M is arranged on the back surface side (−Z side) at a distance f parallel to the condensing hologram ZPH. Near the position corresponding to the condensing position when the white illumination light L parallel to the XZ plane is incident at an angle θ with respect to the Z axis of the condensing hologram ZPH, and 1 from the X axis in the −Y axis direction. Consider a minute hologram region 51 of a condensing hologram ZPH having a width for pixels and a length for one pixel in the X-axis direction.
[0031]
As shown in FIG. 5A, the white illumination light L incident on the minute hologram region 51 is diffracted by the red diffraction component R in the plane parallel to the XZ plane, as in the conventional hologram color filter. , The green diffraction component G and the blue diffraction component B, and the light is condensed near the plane mirror M. On the other hand, as shown in FIG. 5B, such spectroscopy does not occur in a plane parallel to the YZ plane, and is directly below the X axis, which is directly below one side of the minute hologram region 51. Condensate.
[0032]
The light of the red diffraction component R, the green diffraction component G, and the blue diffraction component B reflected by the plane mirror M is incident on a region 51 ′ that is symmetrical with respect to the X axis, and this region 51 of the condensing hologram ZPH. Due to the diffracting action of ', the light is re-diffracted in the direction opposite to the incident illumination light L and returns to the incident direction. This state is shown as a light beam L ′ in FIG.
[0033]
However, if a micro-hologram having the same diffraction characteristics as the hologram in the micro-hologram region 51 is arranged in the region 51 ′, the hologram in the region 51 ′ no longer satisfies the Bragg diffraction condition and is reflected by the plane mirror M. The light of the red diffraction component R, the green diffraction component G, and the blue diffraction component B passes through the symmetrical region 51 ′ without being re-diffracted. This state is shown as a light beam L ″ in FIGS. 4 and 5B.
[0034]
Therefore, when the incident surface of the illumination light L is an XZ plane, it has a condensing function and a spectral function in the XZ plane, and a deflection function in the YZ plane perpendicular to the incident plane ( It is not always necessary to have a condensing function.) By forming a hologram color filter by arranging two-dimensional array of micro-holograms 51 having the same characteristics, the hologram color filter is arranged in the vicinity of the condensing surface of the hologram color filter. The light dispersed by the wavelength dispersion reflected by the reflecting layer is not re-diffracted by the hologram color filter but travels substantially in the front direction, and this is combined with a spatial light modulator to create a reflective image display device. When configured, an image can be observed almost without distortion from the front, and a projection lens having a large aperture is not required for projection display.
[0035]
For example, a region surrounded by a solid line in FIG. 6 is used as the micro-hologram 51 having such characteristics.
[0036]
Next, a reflection type image display apparatus using the hologram color filter 50 of the present invention will be described with reference to the explanatory view of FIG. FIG. 1A is a projection view of the substantially parallel white illumination light 33 onto the incident surface, and FIG. 1B is a projection view perpendicular to the incident surface. In this example, a polymer dispersed liquid crystal (PDLC) display element 31 is used as a spatial light modulator. In the figure, the hologram color filter 50 of the present invention is arranged on the front side (observation side) of a PDLC display element 31 in which pixels 60 each consisting of a set of R, G, and B color separation pixels are regularly arranged. Is done. A reflective layer 32 such as an aluminum film is disposed on the back surface of the PDLC display element 31. Note that the distance between the hologram color filter 50 and the reflective layer 32 is selected to be approximately equal to the condensing distance (focal length) of the micro hologram 51.
[0037]
In the hologram color filter 50, in the direction of the incident surface of the white illumination light 33 (FIG. 1 (a)), a minute pitch at the same pitch as the arrangement pitch of the pixels 60 composed of one set of R, G, and B color separation pixels. The holograms 51 are arranged in an array, and in the direction perpendicular to the incident surface (FIG. 1B), the minute holograms 51 having the same pitch as the arrangement pitch of the pixels 60 are arranged in an array. Yes.
[0038]
Then, in the direction of the incident surface of the white illumination light 33 (FIG. 1A), the minute hologram 51 is included in the white illumination light 33 incident at an angle θ with respect to the normal line of the hologram color filter 50. The green component light 34 </ b> G is formed so as to be condensed near the center of the color separation pixel G in the corresponding pixel 60.
[0039]
Further, in the direction perpendicular to the incident surface (FIG. 1B), the minute hologram is such that the light deflected by the minute hologram 51 in the direction perpendicular to the incident surface is condensed and incident near the center of the pixel 60. The pixels 60 are arranged so as to be shifted by a half pitch or more with respect to the arrangement pitch of 51 (in the case of cutting out the small hologram 51 as shown in FIGS. 4 and 5, it becomes a half pitch, but the cutting is shifted from the X axis. If this is done, it will be larger than half the pitch.)
[0040]
Due to this arrangement, when the white illumination light 33 is incident at an incident angle θ along the incident surface from the surface side of the hologram color filter 50, the hologram color filter 50 causes wavelength dispersion in the incident surface direction, and The condensing positions are not distributed in the center of the minute hologram 51 but in the direction of one side along the incident surface or the outside line. Among them, the red wavelength component 34R is near the surface of the reflective layer 32 at the position of the pixel R that displays red, and the green component 34G is near the surface of the reflective layer 32 at the position of the pixel G that displays green. By arranging the micro hologram 51 so that the component 34B is diffracted and condensed near the surface of the reflection layer 32 of the pixel B that displays blue, each color component is hardly attenuated by the black matrix. It passes through each color separation pixel R, G, B, is reflected by the reflective layer 32, and passes through the corresponding color separation pixel R, G, B again from the back side. The light is incident on the hologram 51 and is not diffracted by the hologram color filter 50, but becomes transmitted light 35R, 35G, and 35B, and enters the observer's eyes. Therefore, each color component 34R, 34G, 34B is incident on the color separation pixels R, G, B for displaying red, green, and blue, respectively, and is subjected to intensity modulation in accordance with the display state of those color separation pixels. Therefore, it is possible to display a color image by combining the modulation states of the color separation pixels R, G, and B. In addition, since the hologram color filter 5 with high use efficiency of the illumination light 33 is used for color image display, brighter color image display is possible.
[0041]
Moreover, the display lights 35R, 35G, and 35B are emitted substantially in the front direction in the direction of the incident surface, and also in the direction perpendicular to the incident surface (FIG. 1B), the focal length of the minute hologram 51 is f, the pixel When the pitch of 60 is P, the emission angle is approximately β = tan ⁻¹ (P / (2f)) ≈P / (2f), and the traveling proceeds substantially in the front direction. Therefore, the display image can be observed from substantially the front direction, and the image can be observed without distortion. Further, when the display image of the reflection type image display apparatus is projected and displayed, the display light 35R, 35G, and 35B is emitted substantially perpendicularly from the image display surface, so that the light use efficiency is reduced without using a projection lens having a large aperture. A bright image can be projected without causing any problems.
[0042]
Further, as shown in FIG. 2, the arrangement period of the micro hologram 51 and the pixel 60 of the PDLC display element 31 is shifted between adjacent pixels in a direction perpendicular to the incident surface (so-called “delta arrangement”). The light rays 35 (35R, 35G, and 35B) that are reflected by the reflective layer 32 and enter the adjacent minute hologram 51 are further diffracted because they are further away from the Bragg diffraction conditions. The rate is further reduced. As a result, the light utilization efficiency can be further increased. 2A is a perspective view of a reflection type image display device using the hologram color filter 50 of the present invention, FIG. 2B is a view seen from the X direction, and FIG. 2C is a view from the Y direction. FIG.
[0043]
Note that the micro-hologram 51 obtained by cutting out the region surrounded by the solid line in FIG. 6 has a condensing function in both the X direction and the Y direction, as schematically shown in FIG. As shown in FIG. 7B, a hologram obtained by linearly approximating the interference fringes may be used as the minute hologram 51 having a condensing function only in one obliquely inclined direction. In this case, since the interference fringes can be constituted by straight lines parallel to each other, there is an advantage that calculation and production are facilitated when the computer-generated hologram is created.
[0044]
Also in the present invention, a digital micromirror device (DMD) can be used in place of the PDLC display element 31 described above. With reference to FIG. 10 and FIG. 1 of the related art, the configuration in that case is clear, and thus illustration is omitted.
[0045]
The reflection type image display apparatus of these embodiments can be used as a projection image display apparatus. FIG. 3 shows a cross-sectional view when a reflective image display device using the PDLC display element 31 is projected. For example, display light that is illuminated obliquely from the front of the image display device of FIG. 1 and modulated by the image display device by white parallel illumination light 33 from the illumination device 14 that is a combination of a metal halide lamp 15 and a parabolic mirror 16. 35 is incident on the projection lens 18, and the display image is enlarged by the projection lens 18 and formed on the screen 19, so that a bright projection image can be obtained.
[0046]
As described above, the hologram color filter of the present invention and the image display device using the same have been described based on the explanation of the principle and some embodiments, but the present invention is not limited to these embodiments and can be variously modified. is there. For example, a normal liquid crystal display element of a TN type or a super twist nematic (STN) type can be used instead of the PDLC display element.
[0047]
【The invention's effect】
As is apparent from the above description, according to the hologram color filter of the present invention and the image display apparatus using the same, the hologram color filter has a condensing function and a spectroscopic function in the direction of the incident surface of the obliquely incident illumination light. In the direction perpendicular to the incident surface, micro-holograms with the same characteristics having a deflection function are two-dimensionally arranged in an array, so that they are reflected by the reflective layer disposed near the condensing surface of the hologram color filter. The light dispersed by the wavelength dispersion is not re-diffracted by the hologram color filter, but travels substantially in the front direction. When this is combined with the spatial light modulator to constitute a reflective image display device, the light is separated from the front. An image can be observed without distortion, and a bright image can be obtained without causing a decrease in light use efficiency without using a projection lens with a large aperture for projection display. It is possible to shadow.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a reflective image display device of one embodiment using a hologram color filter of the present invention.
FIG. 2 is a diagram for explaining a modification of the reflection type image display apparatus using the hologram color filter of the present invention.
FIG. 3 is a cross-sectional view when the reflection type image display device of FIG. 1 is used as a projection image display device.
FIG. 4 is a diagram for explaining the principle of a hologram color filter of the present invention.
FIG. 5 is a projection view onto the XZ plane and the YZ plane of FIG. 4;
FIG. 6 is a diagram schematically showing interference fringes of a condensing hologram.
FIG. 7 is a diagram schematically showing interference fringes of a modification of a minute hologram.
FIG. 8 is a cross-sectional view of a liquid crystal display device using a conventional hologram color filter.
FIG. 9 is a cross-sectional view of a reflective image display device using a conventional hologram color filter.
FIG. 10 is a cross-sectional view of a reflection type image display apparatus using a conventional digital micromirror device and a hologram color filter.
[Explanation of symbols]
ZPH ... Condensation hologram M ... Plane mirror L ... White illumination light R ... Red diffraction component (R color separation pixel)
G: Green diffraction component (G color separation pixel)
B ... Blue diffraction component (B color separation pixel)
L ′: Re-diffracted light beam L ”... Light beam 14 that is not re-diffracted and passes through directly… Illuminating device 15 ... Metal halide lamp 16 ... Parabolic mirror 18 ... Projection lens 19 ... Screen 31 ... Polymer dispersed liquid crystal (PDLC) Display element 32 ... Reflective layer 33 ... White illumination light 34 ... Diffraction light 34R, 34G, 34B ... Diffraction spectral component 35 ... Display light 35R, 35G, 35B ... Display light (transmitted light)
50. Hologram color filter (present invention)
51 ... Micro hologram (region)
51 '... Symmetrical region 60 ... Pixel

Claims (10)

  Micro-holograms with the same characteristics that have a condensing function and a spectroscopic function in the direction of the incident surface of obliquely incident illumination light and that have a deflection function in the direction perpendicular to the incident surface are arranged in a two-dimensional array. Hologram color filter characterized by   2. The hologram color filter according to claim 1, wherein the minute hologram has a condensing function in addition to a deflecting function in a direction perpendicular to the incident surface.   The hologram color filter according to claim 1 or 2, wherein the micro-hologram is cut out from an eccentric region of a condensing hologram.   4. The hologram color filter according to claim 1, wherein adjacent micro-holograms in a direction perpendicular to the incident plane are shifted in a direction parallel to the incident plane in the arrangement period of the micro-holograms. 5. .   5. The hologram color filter according to claim 1, wherein the minute hologram is a hologram having convergence only in a direction inclined with respect to an incident surface.   An illumination light source and a two-dimensional micro-hologram having the same characteristics that have a condensing function and a spectral function in the direction of the incident surface of illumination light obliquely incident from the illumination light source and a deflection function in the direction perpendicular to the incident surface A hologram color filter arranged in an array, a reflective layer disposed in the vicinity of the condensing surface, and a transmissive spatial light modulator disposed between the hologram color filter and the reflective layer. An image display device using a featured hologram color filter.   The arrangement period of the pixels of the transmissive spatial light modulator is shifted by at least a half pixel with respect to the arrangement period of the minute holograms of the hologram color filter in a direction perpendicular to the incident surface. An image display device using the hologram color filter according to claim 6.   8. The hologram color filter according to claim 6, wherein a polymer dispersed liquid crystal display element that controls a white turbid state and a transparent state by applying and releasing a voltage is used as the transmissive spatial light modulator. Image display device.   An illumination light source and a two-dimensional micro-hologram having the same characteristics that have a condensing function and a spectral function in the direction of the incident surface of illumination light obliquely incident from the illumination light source and a deflection function in the direction perpendicular to the incident surface Digital micromirror device display consisting of a two-dimensional array of hologram color filters arranged in an array and micromirrors whose tilt angles can be controlled independently by external signals placed in the vicinity of the condensing surface An image display device using a hologram color filter, characterized by comprising an element.   The image display apparatus using the hologram color filter according to claim 6, wherein the reflected light is enlarged and projected by a projection optical system.

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