Light homogenizing element

A light homogenizing element having a light incident surface and at least one diffusion surface, and comprising:

• a first substrate, having a first surface and a second surface opposite to each other, and comprising a first cavity, wherein the first cavity penetrates from the first surface to the second surface;
• a carrier layer, located on the first surface of the first substrate and having a light passing region penetrating the carrier layer, wherein the carrier layer comprises a protruding structure, and the protruding structure encloses the light passing region;
• a piezoelectric film, located on the carrier layer;
• a driving electrode, located on the carrier layer and configured to drive the piezoelectric film, wherein the driving electrode applies a driving voltage to the piezoelectric film, such that the piezoelectric film is stretched and deformed, pulling the protruding structure to bend and deform;
• a light-transmitting layer, overlapped and provided on the protruding structure, wherein a surface of the light-transmitting layer covering the light passing region is the light incident surface;
• a plurality of light diffusion microstructures, provided on the at least one diffusion surface, wherein projections of the plurality of light diffusion microstructures on the light-transmitting layer are located in the light passing region;
• an optical liquid, configured to fill the first cavity, wherein the light-transmitting layer directly contacts the optical liquid, and part of the optical liquid is located between the light incident surface and the at least one diffusion surface;
• a second substrates;
• and
• an elasticity film, wherein the second substrate is located on the second surface of the first substrate and comprises at least one second cavity, the at least one second cavity communicates with the first cavity of the first substrate, the second substrate is located between the elasticity film and the first substrate, and the elasticity film covers the second substrate.

A light homogenizing element, having a light incident surface and at least one diffusion surface, and comprising:

• a first substrate, having a first surface and a second surface opposite to each other, and comprising a first cavity, wherein the first cavity penetrates from the first surface to the second surface;
• a carrier layer, located on the first surface of the first substrate and having a light passing region penetrating the carrier layer, wherein the carrier layer comprises a protruding structure, and the protruding structure encloses the light passing region;
• a piezoelectric film, located on the carrier layer;
• a driving electrode, located on the carrier layer and configured to drive the piezoelectric film, wherein the driving electrode applies a driving voltage to the piezoelectric film, such that the piezoelectric film is stretched and deformed, pulling the protruding structure to bend and deform;
• a light-transmitting layer, overlapped and provided on the protruding structure, wherein a surface of the light-transmitting layer covering the light passing region is the light incident surface;
• and
• a plurality of light diffusion microstructures, provided on the at least one diffusion surface, wherein projections of the plurality of light diffusion microstructures on the light-transmitting layer are located in the light passing region,
• wherein the driving electrode is ring-shaped, and the driving electrode surrounds the light passing region.

A light homogenizing element, having a light incident surface and at least one diffusion surface, and comprising:

• a first substrate, having a first surface and a second surface opposite to each other, and comprising a first cavity, wherein the first cavity penetrates from the first surface to the second surface;
• a carrier layer, located on the first surface of the first substrate and having a light passing region penetrating the carrier layer, wherein the carrier layer comprises a protruding structure, and the protruding structure encloses the light passing region;
• a piezoelectric film, located on the carrier layer;
• a driving electrode, located on the carrier layer and configured to drive the piezoelectric film, wherein the driving electrode applies a driving voltage to the piezoelectric film, such that the piezoelectric film is stretched and deformed, pulling the protruding structure to bend and deform;
• a light-transmitting layer, overlapped and provided on the protruding structure, wherein a surface of the light-transmitting layer covering the light passing region is the light incident surface;
• and
• a plurality of light diffusion microstructures, provided on the at least one diffusion surface, wherein projections of the plurality of light diffusion microstructures on the light-transmitting layer are located in the light passing region,
• wherein the driving electrode comprises a plurality of arc-shaped electrodes, the plurality of arc-shaped electrodes are arranged on a circular region, the circular region surrounds the light passing region, and a polarity direction of the driving voltage applied by any one of the plurality of arc-shaped electrodes is opposite to a polarity direction of the driving voltage applied by an adjacent other one of the plurality of arc-shaped electrodes.

A light homogenizing element, having a light incident surface and at least one diffusion surface, and comprising:

• a first substrate, having a first surface and a second surface opposite to each other, and comprising a first cavity, wherein the first cavity penetrates from the first surface to the second surface;
• a carrier layer, located on the first surface of the first substrate and having a light passing region penetrating the carrier layer, wherein the carrier layer comprises a protruding structure, and the protruding structure encloses the light passing region;
• a piezoelectric film, located on the carrier layer;
• a driving electrode, located on the carrier layer and configured to drive the piezoelectric film, wherein the driving electrode applies a driving voltage to the piezoelectric film, such that the piezoelectric film is stretched and deformed, pulling the protruding structure to bend and deform;
• a light-transmitting layer, overlapped and provided on the protruding structure, wherein a surface of the light-transmitting layer covering the light passing region is the light incident surface;
• and
• a plurality of light diffusion microstructures, provided on the at least one diffusion surface, wherein projections of the plurality of light diffusion microstructures on the light-transmitting layer are located in the light passing region,
• wherein a cross-sectional profile of the light incident surface is wavy.

A light homogenizing element, having a light incident surface and at least one diffusion surface, and comprising:

• a first substrate, having a first surface and a second surface opposite to each other, and comprising a first cavity, wherein the first cavity penetrates from the first surface to the second surface;
• a carrier layer, located on the first surface of the first substrate and having a light passing region penetrating the carrier layer, wherein the carrier layer comprises a protruding structure, and the protruding structure encloses the light passing region;
• a piezoelectric film, located on the carrier layer;
• a driving electrode, located on the carrier layer and configured to drive the piezoelectric film, wherein the driving electrode applies a driving voltage to the piezoelectric film, such that the piezoelectric film is stretched and deformed, pulling the protruding structure to bend and deform;
• a light-transmitting layer, overlapped and provided on the protruding structure, wherein a surface of the light-transmitting layer covering the light passing region is the light incident surface;
• and
• a plurality of light diffusion microstructures, provided on the at least one diffusion surface, wherein projections of the plurality of light diffusion microstructures on the light-transmitting layer are located in the light passing region,
• wherein the light incident surface is a flat surface, and a light incident angle between the light incident surface and the first surface of the first substrate ranges from 0.5 degrees to 20 degrees.

A light homogenizing element, having a light incident surface and at least one diffusion surface, and comprising:

• a first substrate, having a first surface and a second surface opposite to each other, and comprising a first cavity, wherein the first cavity penetrates from the first surface to the second surface;
• a carrier layer, located on the first surface of the first substrate and having a light passing region penetrating the carrier layer, wherein the carrier layer comprises a protruding structure, and the protruding structure encloses the light passing region;
• a piezoelectric film, located on the carrier layer;
• a driving electrode, located on the carrier layer and configured to drive the piezoelectric film, wherein the driving electrode applies a driving voltage to the piezoelectric film, such that the piezoelectric film is stretched and deformed, pulling the protruding structure to bend and deform;
• a light-transmitting layer, overlapped and provided on the protruding structure, wherein a surface of the light-transmitting layer covering the light passing region is the light incident surface;
• a plurality of light diffusion microstructures, provided on the at least one diffusion surface, wherein projections of the plurality of light diffusion microstructures on the light-transmitting layer are located in the light passing region;
• and
• a plurality of optical particles, distributed in the optical liquid, wherein a refractive index of the plurality of optical particles is different from a refractive index of the optical liquid.