Near-to-eye display device
View Patent ↗A near-to-eye display device includes a display image source ( 01 ) which includes an electronic display and is used for generating image light; an collimating device ( 02 ) which includes a microlens array including refraction microlens units having approximately the same focal length, wherein a distance between the collimating device ( 02 ) and the display image source ( 01 ) is approximately the focal length of the refraction microlens units, the collimating device ( 02 ) is used for collimating the image light emitted by the display image source ( 01 ); and a light control assembly ( 03 ) which includes light refraction microprism units having a one-to-one correspondence to the refraction microlens units each of which has a planar surface, the light control assembly is used for controlling a propagation direction of the image light. The refraction microlens units and the light refraction microprism units are arranged with a filling coefficient as close to 1 as possible.
1 . A near-to-eye display device, which comprises:
a display image source ( 1 ) which comprises an electronic display for generating image light;
an collimating device ( 02 ) which comprises a microlens array comprising refraction microlens units having approximately a same focal length, wherein a distance between the collimating device ( 02 ) and the display image source ( 01 ) is approximately the focal length of the refraction microlens units of the collimating device ( 02 ), the collimating device ( 02 ) is for collimating the image light emitted by the display image source ( 01 ); and
a light control assembly ( 03 ) which comprises light refraction microprism units, wherein the light refraction microprism units, each of which has a planar surface, have a one-to-one correspondence with the refraction microlens units of the collimating device ( 02 ); the light control assembly is for controlling a propagation direction of the image light through refraction on a working surface, wherein:
the refraction microlens units of the collimating device ( 02 ) and light refraction microprism units of the light control assembly ( 03 ) are arranged with a filling coefficient as close to 1 as possible;
a shape of vertical projections of the light refraction microprism units of the light control assembly ( 03 ) on the display image source ( 01 ) is approximately the same as that of the refraction microlens units of the collimating device ( 02 ) on the display image source ( 01 );
the planar surfaces of two adjacent light refraction microprism units of the light control assembly ( 03 ) deflect the image light from the display image source ( 01 ) that is collimated by the refraction microlens units of the collimating device ( 02 );
an arrangement of the two adjacent light refraction microprism units of the light control assembly ( 03 ) satisfies a condition that virtual images formed by image light outputted by the two adjacent light refraction microprism units of the light control assembly ( 03 ) do not overlap when an observer observes; and
the light refraction microprism units of the light control assembly ( 03 ) are liquid crystal devices, which are configured to adjust a deflection angle of the image light emitted by the display image source ( 01 ) without moving the light control assembly ( 03 ).
2 . The near-to-eye display device according to claim 1 , wherein the collimating device ( 02 ) is located between the display image source ( 01 ) and the light control assembly ( 03 ).
3 . The near-to-eye display device according to claim 1 , wherein a focus length of the refraction microlens units of the collimating device ( 02 ) is variable.
4 . The near-to-eye display device according to claim 1 , wherein the refraction microlens units of the collimating device ( 02 ) have a one-to-one correspondence with pixel units of the display image source ( 01 ).
5 . The near-to-eye display device according to claim 1 , wherein the deflection angle of the image light from the display image source ( 01 ) is dynamically adjusted by the light refraction microprism units of the light control assembly ( 03 ).
6 . The near-to-eye display device according to claim 1 , wherein each of the light refraction microprism units of the light control assembly ( 03 ) has a nonplanar surface.
7 . The near-to-eye display device according to claim 1 , wherein the refraction microlens units of the collimating device ( 02 ) are attached to a surface of the light refraction microprism units of the light control assembly ( 03 ).
8 . The near-to-eye display device according to claim 1 , wherein image light outputted by the light control assembly ( 03 ) enters a human eye after passing through an optical waveguide substrate.