Image display apparatus
AssigneeCanon Kabushiki Kaisha
InventorMasakazu Tohara
Life of this patent
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Abstract
The image display apparatus includes an optical system configured to introduce light from a display surface of a display element to an observer. The optical system includes in order from the display element toward the observer, a first phase plate, a semi-transmissive reflective surface, a lens, a second phase plate, and a polarization beam splitter. The display element is configured to make, at a central portion of the display surface, luminance in a normal direction in which a normal to the display surface extends higher than that in a specific direction tilted outward with respect to the normal direction, and to make, at a most edge portion of the display surface, the luminance in the normal direction lower than that in the specific direction.
Claims18
An image display apparatus comprising:
- a display element having a display surface configured to display an image;
- and
- an optical system configured to introduce light from the display surface to an observer,
- wherein the optical system includes in order from the display element toward the observer:
- a first phase plate;
- a semi-transmissive reflective surface;
- a lens;
- a second phase plate;
- and
- a polarization beam splitter configured to reflect a first linearly polarized light and transmit a second linearly polarized light whose polarization direction is orthogonal to that of the first linearly polarized light,
- wherein, when a direction in which a normal to the display surface extends is referred to as a normal direction, and a direction tilted outward of the display surface with respect to the normal direction is referred to as a specific direction, luminance in the normal direction is higher than that in the specific direction at a central portion of the display surface, and luminance in the normal direction is lower than that in the specific direction at a most edge portion of the display surface, and
- wherein the following inequality is satisfied:
- |φ max−θ3|≥15°
- where φ max represents an angle between the specific direction and the normal direction at the most edge portion, and θ3 represents an emergent angle of a principal ray of first light proceeding from the most edge portion to a center of an exit pupil, the first light being transmitted through the semi-transmissive reflective surface and then being transmitted through the polarization beam splitter.
An image display apparatus comprising:
- a display element having a display surface configured to display an image;
- and
- an optical system configured to introduce light from the display surface to an observer,
- wherein the optical system includes in order from the display element toward the observer:
- a first phase plate;
- a semi-transmissive reflective surface;
- a lens;
- a second phase plate;
- and
- a polarization beam splitter configured to reflect a first linearly polarized light and transmit a second linearly polarized light whose polarization direction is orthogonal to that of the first linearly polarized light,
- wherein, when a direction in which a normal to the display surface extends is referred to as a normal direction, and a direction tilted outward of the display surface with respect to the normal direction is referred to as a specific direction, color shift in the normal direction is smaller than that in the specific direction at a central portion of the display surface, and the color shift in the normal direction is larger than that in the specific direction at a most edge portion of the display surface, and
- wherein the following inequality is satisfied:
- |φ max−θ3|≥15°
- where φ max represents an angle between the specific direction and the normal direction at the most edge portion, and θ3 represents an emergent angle of a principal ray of first light proceeding from the most edge portion to a center of an exit pupil, the first light being transmitted through the semi-transmissive reflective surface and then being transmitted through the polarization beam splitter.
Dependencies are inferred from the claim text.