Driver for a display device
There is provided a driver for a spatial light modulator comprising a plurality of pixels. The driver is configured to receive a hologram of a picture and drive the spatial light modulator to display the hologram on a group of pixels of the plurality of pixels. The driver is further configured to apply a series of phase offsets to the spatial light modulator displaying the hologram, wherein each phase offset of the series of phase offsets is applied to each pixel of the group of pixels for a respective predetermined period of time.
1 . A driver for a spatial light modulator comprising a plurality of pixels, wherein the driver is configured to:
receive a hologram of a picture;
drive the spatial light modulator to display the hologram on a group of pixels of the plurality of pixels;
determine, for each pixel of the group of pixels, a respective voltage offset to be applied to the pixel to achieve a particular phase offset of a series of phase offsets; and
apply the series of phase offsets to the spatial light modulator displaying the hologram, wherein each phase offset of the series of phase offsets is applied to each pixel of the group of pixels for a respective predetermined period of time, and wherein each phase offset applied to the group of pixels causes a phase delay of that group of pixels to be modified by a same value.
2 . The driver of claim 1 , where the driver is further configured to apply the series of phase offsets by applying the determined voltage offsets to the group of pixels.
3 . The driver of claim 1 , wherein the respective predetermined periods of time are the same or different from each other.
4 . The driver of claim 1 , wherein the series of phase offsets comprises a finite series of values that is repeated.
5 . The driver of claim 1 , wherein the series of phase offsets comprises randomly generated values.
6 . The driver of claim 1 , wherein an individual phase offset is at least one of (i) between 0 and 2π, (ii) between 0 and π, or (iii) between 0 and π/2.
7 . The driver of claim 1 , wherein a difference between successive phase offset values is at least one of (i) less than 2π, (ii) less than π, or (iii) less than π/2.
8 . The driver of claim 1 , wherein the spatial light modulator comprises a liquid crystal on silicon spatial light modulator.
9 . A holographic projector comprising:
a spatial light modulator comprising a plurality of pixels; and
a driver configured to: (i) receive a hologram of a picture, (ii) drive the spatial light modulator to display the hologram on a group of pixels of the plurality of pixels, (iii) determine, for each pixel of the group of pixels, a respective voltage offset to be applied to the pixel to achieve a particular phase offset of a series of phase offsets; and (iv) apply the series of phase offsets to the spatial light modulator displaying the hologram, wherein each phase offset of the series of phase offsets is applied to each pixel of the group of pixels for a respective predetermined period of time, and wherein each phase offset applied to the group of pixels causes a phase delay of that group of pixels to be modified by a same value.
10 . The holographic projector of claim 9 , further comprising:
a light source arranged to illuminate the spatial light modulator such that a holographic reconstruction of the picture is formed on a replay plane.
11 . The holographic projector of claim 9 , wherein the driver is further configured to apply the series of phase offsets by applying the determined voltage offsets to the group of pixels, and wherein the respective predetermined periods of time are the same or different from each other.
12 . The holographic projector of claim 9 , wherein at least one of: (A) an individual phase offset is at least one of (i) between 0 and 2π, (ii) between 0 and π, or (iii) between 0 and π/2; and (B) a difference between successive phase offset values is at least one of (i) less than 2π, (ii) less than π, or (iii) less than π/2.
13 . A method for driving a spatial light modulator comprising a plurality of pixels, wherein the method comprises:
receiving a hologram of a picture;
driving the spatial light modulator to display the hologram on a group of pixels of the plurality of pixels;
determining, for each pixel of the group of pixels, a respective voltage offset to be applied to the pixel to achieve a particular phase offset of a series of phase offsets; and
applying the series of phase offsets to the spatial light modulator displaying the hologram, wherein each phase offset of the series of phase offsets is applied to each pixel of the group of pixels for a respective predetermined period of time, wherein each phase offset applied to the group of pixels causes phase delays of that group of pixels to be modified by a same value.
14 . The method of claim 13 , wherein applying the series of phase offsets to the spatial light modulator displaying the hologram comprises applying the determined voltage offsets to the group of pixels.
15 . The method of claim 13 , wherein the series of phase offsets comprises a finite series of values that is repeated.
16 . The method of claim 13 , wherein an individual phase offset is at least one of (i) between 0 and 2π, (ii) between 0 and π, or (iii) between 0 and π/2.
17 . The method of claim 13 , wherein a difference between successive phase offsets is at least one of (i) less than 2π, (ii) less than π, or (iii) less than π/2.