Light ray modulation element having multiple viewpoint units, glasses and 3D display system
The present application provides a light-ray modulating element, an eyeglass and a 3D displaying system. The light-ray modulating element is applied to a 3D displaying system, the 3D displaying system includes a 3D displaying device, and the 3D displaying device includes a display panel, and a lens unit disposed at a light exiting side of the display panel; light rays emitted by the display panel pass through the lens unit, are shot to the light-ray modulating element, and form two first viewpoint units at a light entering side of the light-ray modulating element, wherein each of the first viewpoint units includes at least two first viewpoints; and the light-ray modulating element is configured for converging light rays emitted by each of the first viewpoint units to form a second viewpoint unit.
1 . A light-ray modulating element, wherein the light-ray modulating element is applied to a 3D displaying system, the 3D displaying system comprises a 3D displaying device, and the 3D displaying device comprises a display panel, and a lens unit disposed at a light exiting side of the display panel;
wherein light rays emitted by the display panel pass through the lens unit, are shot to the light-ray modulating element, and form two first viewpoint units at a light entering side of the light-ray modulating element, each of the first viewpoint units comprises at least two first viewpoints; and
the light-ray modulating element is configured for converging light rays emitted by each of the first viewpoint units to form a second viewpoint unit, so that all of viewpoints of the second viewpoint unit enter a corresponding single-eye pupil at a same time, wherein the second viewpoint unit comprises at least two second viewpoints;
wherein the light-ray modulating element comprises a plurality of light-ray modulating units, and each of the light-ray modulating units is configured for converging light rays emitted by the first viewpoints to form the second viewpoints, so that the second viewpoints enter the corresponding single-eye pupil; and quantities of the first viewpoints, the second viewpoints and the light-ray modulating units are equal.
2 . The light-ray modulating element according to claim 1 , wherein the light-ray modulating element comprises a holographic interference element of at least one wavelength.
3 . The light-ray modulating element according to claim 2 , wherein when the light-ray modulating element comprises holographic interference elements of multiple wavelengths, the light-ray modulating element comprises a red-light-wavelength holographic interference element, a green-light-wavelength holographic interference element and a blue-light-wavelength holographic interference element that are arranged in layer configuration.
4 . The light-ray modulating element according to claim 1 , wherein visual-area widths of the first viewpoints in a first direction are equal, and visual-area widths of the second viewpoints in the first direction are equal.
5 . The light-ray modulating element according to claim 4 , wherein the visual-area widths of the first viewpoints in the first direction w=LP/f;
wherein L is a distance between the light-ray modulating element and the lens unit, P is a width of a pixel unit in the display panel in the first direction, and f is a height of placement of a lens in the lens unit.
6 . The light-ray modulating element according to claim 5 , wherein a width of a displaying main-lobe region formed by the lens unit in the first direction W=nw, wherein n is the quantity of the first viewpoints, and w is the visual-area widths of the first viewpoints in the first direction.
7 . The light-ray modulating element according to claim 6 , wherein in the second viewpoint unit, an intersection point of marginal rays of the second viewpoints in a human eye is a first intersection point, and a distance between the first intersection point and the light-ray modulating element B=WA/(W−nV);
wherein W is the width of the displaying main-lobe region formed by the lens unit in the first direction, A is a distance between the light-ray modulating element and a pupil of the human eye, n is the quantity of the first viewpoints, and V is the visual-area widths of the second viewpoints in the first direction.
8 . The light-ray modulating element according to claim 1 , wherein the light-ray modulating element comprises a liquid-crystal modulating element;
the liquid-crystal modulating element comprises a first substrate and a second substrate that face each other, a liquid-crystal layer and an electrode layer, the liquid-crystal layer is disposed between the first substrate and the second substrate, and the electrode layer is disposed at at least one side of the liquid-crystal layer; the first substrate is closer to the display panel than the second substrate is; and
the liquid-crystal layer is configured for, under an effect of an electric field generated by the electrode layer, being capable of modulating a phase of incident light rays.
9 . The light-ray modulating element according to claim 8 , wherein the electrode layer comprises a first electrode and a second electrode, and the first electrode and the second electrode are disposed at two opposite sides of the liquid-crystal layer; and
the first electrode comprises a plurality of strip electrodes, and the second electrode comprises a planar electrode.
10 . The light-ray modulating element according to claim 8 , wherein the liquid-crystal modulating element further comprises a polarizer, and the polarizer is disposed at one side of the first substrate close to the display panel.
11 . An eyeglass, wherein the eyeglass comprises the light-ray modulating element according to claim 1 .
12 . The eyeglass according to claim 11 , wherein the eyeglass further comprises a photographing unit, and the photographing unit is configured for, when the light-ray modulating element is at an initial position, while the photographing unit is moving in a first direction, photographing an image formed by the first viewpoints, and when the image changes, recording a movement distance, and transmitting the movement distance to the 3D displaying device.
13 . The eyeglass according to claim 12 , wherein the eyeglass comprises an eyeglass frame, the light-ray modulating element is disposed inside a space defined by the eyeglass frame, and the photographing unit is fixed to the eyeglass frame.
14 . A 3D displaying system, wherein the 3D displaying system comprises an eyeglass according to claim 11 ;
wherein the 3D displaying device further comprises a system controlling unit, and the system controlling unit is electrically connected to the light-ray modulating element of the eyeglass;
wherein the system controlling unit is configured for, according to a predetermined algorithm, calculating visual-area widths of the first viewpoints in the first direction, and transmitting the visual-area widths of the first viewpoints in the first direction to the light-ray modulating element; and
the light-ray modulating element is configured for, according to the visual-area widths of the first viewpoints in the first direction, performing phase modulation.
15 . The 3D displaying system according to claim 14 , wherein the system controlling unit is further configured for, according to w=LP/f, calculating the visual-area widths of the first viewpoints in the first direction, and transmitting the visual-area widths of the first viewpoints in the first direction to the light-ray modulating element, wherein w is the visual-area widths of the first viewpoints in the first direction, L is a distance between the light-ray modulating element and the lens unit, P is a width of a pixel unit in the display panel in the first direction, and f is a height of placement of a lens in the lens unit.
16 . The 3D displaying system according to claim 15 , wherein the 3D displaying system further comprises a photographing element, and the photographing element is electrically connected to the system controlling unit; and
the photographing element is configured for measuring a distance L between the light-ray modulating element and the lens unit, and transmitting L to the system controlling unit.
17 . The 3D displaying system according to claim 14 , wherein the system controlling unit is further configured for, according to w1=L0/w0*L1, calculating the visual-area widths of the first viewpoints in the first direction, and transmitting the visual-area widths of the first viewpoints in the first direction to the light-ray modulating element, wherein w1 is a visual-area width in the first direction of the first viewpoint corresponding to the light-ray modulating element at a current position, L0 is a distance between the light-ray modulating element at an initial position and the lens unit, w0 is a visual-area width in the first direction of the first viewpoint corresponding to the light-ray modulating element at the initial position, and L1 is a distance between the light-ray modulating element at the current position and the lens unit.
18 . The 3D displaying system according to claim 17 , wherein the 3D displaying system further comprises a photographing element; the 3D displaying device further comprises an image rendering unit; the eyeglass further comprises a photographing unit; all of the photographing element, the image rendering unit and the photographing unit are electrically connected to the system controlling unit; the display panel is electrically connected to the image rendering unit;
the photographing element is configured for measuring in real time a distance between the light-ray modulating element and the lens unit, and transmitting the measured distance to the system controlling unit;
the photographing unit is configured for, when the light-ray modulating element is at the initial position, while the photographing unit is moving in the first direction, photographing an image formed by the first viewpoints, and when the image changes, recording a movement distance, and transmitting the movement distance to the system controlling unit;
the system controlling unit is further configured for, when the light-ray modulating element is at the initial position, while the photographing unit is moving in the first direction, transmitting an image controlling signal to the image rendering unit;
the image rendering unit is configured for, according to the image controlling signal, outputting an image signal to the display panel; and
the display panel is configured for displaying according to the image signal, so that the first viewpoints form different images.