Double-shutter lenses with compensators
View Patent ↗Exemplary embodiments of systems for high-performance compensated shutter lens designs, may include compensators for compensating for performance problems that stem from real-world performance limitations in present shutter-glass designs. In an embodiment, a shutterglass lens may include first and second pi-cells and first and second compensators. The pi-cells and the compensators of the shutterglass lens may be stacked together within the shutterglass lens.
1. A shutterglass lens operable to pass temporally modulated display images, the shutterglass lens comprising:
a liquid crystal (LC) cell;
a first optical compensator; and
a second optical compensator;
wherein the LC cell is bounded by the first and second optical compensators, and wherein at least one of the first and second optical compensators comprise a pair of crossed a-plates, and wherein at least one of the first and second optical compensators comprises a pair of a-plates, with a first a-plate having retardation of substantially half of the retardation of the LC cell and the second a-plate having retardation greater than the first a-plate.
2. The shutterglass lens of claim 1 , wherein the LC cell is a pi-cell.
3. The shutterglass lens of claim 1 , wherein at least one of the first and second optical compensators comprises a pair of a-plates, both a-plates having substantially similar retardation values.
4. The shutterglass lens of claim 1 , wherein the second a-plate has an optical axis that is substantially orthogonal to a rubbing direction of the LC cell.
5. The shutterglass lens of claim 1 , further comprising an entry polarizer having a first optical axis and an exit polarizer having a second optical axis, wherein the first optical axis is oriented orthogonal to the second optical axis.
6. A shutterglass lens operable to pass temporally modulated display images, the shutterglass lens comprising:
a pi cell;
a first pair of a-plates comprising a first a-plate and a second a-plate, wherein the first a-plate is adjacent a first side of the pi cell and the second a-plate is adjacent the first a-plate;
a second pair of a-plates comprising a third a-plate and a fourth a-plate, wherein the third a-plate is adjacent a second side of the pi cell and the fourth a-plate is adjacent the third a-plate;
wherein the first and second a-plates have substantially orthogonal optical axes, and wherein the third and fourth a-plates have substantially orthogonal optical axes, and wherein the pi cell has a cell rubbing direction, and wherein the first and third a-plates have an optical axis orthogonal to the cell rubbing direction, and wherein the second and fourth a-plates have an optical axis aligned with the cell rubbing direction.
7. The shutterglass lens of claim 6 , wherein the first and second a-plates have substantially similar retardation, and wherein the third and fourth a-plates have different retardation values from each other.
8. The shutterglass lens of claim 6 , wherein the first, second and fourth a-plates each have a retardance around 600 nm, and wherein the third a-plate has a retardance around 640 nm.
9. The shutterglass lens of claim 6 , further comprising a first polarizer having a first optical axis and a second polarizers having a second optical axis, wherein the first polarizer is adjacent the second a-plate, wherein the second polarizer is adjacent the fourth a-plate, and wherein the first optical axis is orthogonal to the second optical axis.