Transmission type laminated hologram optical element and image display device comprising this optical element
First Claim
1. A transmission type laminated hologram optical element caused to be of the configuration in which a plurality of transmission type hologram optical elements having diffraction acceptance incident angles different from each other are laminated,wherein each of said respective transmission type hologram optical elements are a polarization selective hologram optical element having a structure in that plural regions where incident polarization azimuth dependencies of a refractive index are different from each other are arranged in order,wherein each of said respective transmission type hologram optical elements are a polarization selective hologram optical element including a polymer dispersion liquid crystal material.
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Abstract
The present invention is directed to a transmission type laminated hologram optical element constituting an image display apparatus, wherein plural transmission type hologram optical elements (13), (14), (15) where diffraction acceptance incident angles are different from each other are laminated. The respective transmission type hologram optical elements are adapted so that outgoing angles with respect to center incident angles of respective diffraction acceptance incident angles at an arbitrary wavelength of the visible region are different from each other, whereby a diffraction acceptance angle of incident light can be broadened, light utilization efficiency is permitted to be high, and distance with respect to color pixels of the spatial light modulation element can be optimally set from viewpoints of light utilization efficiency.
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Citations
62 Claims
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1. A transmission type laminated hologram optical element caused to be of the configuration in which a plurality of transmission type hologram optical elements having diffraction acceptance incident angles different from each other are laminated,
wherein each of said respective transmission type hologram optical elements are a polarization selective hologram optical element having a structure in that plural regions where incident polarization azimuth dependencies of a refractive index are different from each other are arranged in order, wherein each of said respective transmission type hologram optical elements are a polarization selective hologram optical element including a polymer dispersion liquid crystal material.
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3. A transmission type laminated hologram optical element caused to be of the configuration in which a plurality of transmission type hologram optical elements having diffraction acceptance incident angles different from each other are laminated,
wherein each of said respective transmission type hologram optical elements are a polarization selective hologram optical element having a structure in that plural regions where incident polarization azimuth dependencies of a refractive index are different from each other are arranged in order, wherein the transmission type hologram optical elements constitute a micro-lens array.
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5. A transmission type laminated hologram optical element caused to be of the configuration in which a plurality of transmission type hologram optical elements having diffraction acceptance incident angles different from each other are laminated,
wherein each of said respective transmission type hologram optical elements are a polarization selective hologram optical element having a structure in that plural regions where incident polarization azimuth dependencies of a refractive index are different from each other are arranged in order, wherein the respective transmission type hologram optical elements are adapted so that outgoing angles with respect to center incident angles of respective diffraction acceptance incident angles at an arbitrary wavelength of the visible region are different from each other by 5 degrees or more.
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6. An image display device comprising:
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a transmission type laminated hologram optical element, and a spatial light modulation element for modulating outgoing light from the transmission type laminated hologram optical element, wherein the transmission type laminated hologram optical element is caused to be of the configuration such that a plurality of transmission type hologram optical elements in which diffraction acceptance incident angles are different from each other and outgoing angles with respect to center incident angles of respective diffraction acceptance incident angles at an arbitrary wavelength of the visible region are different from each other are laminated. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An image display apparatus comprising:
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an illumination light source for emitting illumination light; a transmission type laminated hologram optical element for diffracting incident light; an illumination optical system for guiding the illumination light to the transmission type laminated hologram optical element as incident light; a spatial light modulation element for modulating illumination light which has been emitted from the transmission type laminated hologram optical element; and a magnification optical system for magnifying the illumination light which has been modulated by the spatial light modulation element to form an image thereof, wherein the transmission type laminated hologram optical element is caused to be of the configuration such that a plurality of transmission type hologram optical elements in which diffraction acceptance incident angles are different from each other, and outgoing angles with respect to center incident angles of respective diffraction acceptance incident angles at an arbitrary wavelength of the visible region are different from each other are laminated. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. An image display apparatus comprising:
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an illumination light source for emitting illumination light; a transmission type polarization selective hologram optical element having a structure in that two regions where incident polarization azimuth dependencies of a refractive index are different from each other are arranged in order, and caused to be of the configuration such that a plurality of transmission type hologram optical elements in which diffraction acceptance incident angles are different from each other are laminated to diffract incident light; an illumination optical system for guiding the illumination light to allow it to be incident on the transmission type polarization selective hologram optical element at an incident angle from more than 30°
to less than 90°
with respect to a normal of the illumination light receiving surface of the transmission type polarization selective hologram optical element;a reflection type spatial light modulation element for modulating a polarization state of illumination light which has been diffracted by the transmission type polarization selective hologram optical element; and a magnification optical system for magnifying a display image which has been modulated by the reflection type spatial light modulation element, wherein respective transmission type hologram optical elements constituting the transmission type polarization selective hologram optical element are adapted so that outgoing angles with respect to center incident angles of respective diffraction acceptance incident angles at an arbitrary wavelength of the visible region are different from each other, and serves to diffract a P-polarized light component or an S-polarized light component of illumination light to be received mainly toward the reflection type spatial modulation element and to allow diffraction efficiency with respect to a polarization component perpendicular to a polarization component which is mainly diffracted at the first incidence of rays of illumination light which are re-incident after having undergone a phase modulation by the reflection type spatial light modulation element to be 10% or less so that 70% of the component or more is transmitted. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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Specification