Hologram display apparatus and hologram display method

1. A hologram display apparatus, comprising a controller and a display device, wherein

the controller is configured to obtain, according to a preset image of a to-be-displayed object, a plurality of grayscale values G i of an image of the to-be-displayed object, generate a plurality of display sub-image codes Q j according to the plurality of grayscale values G i , and transmit the plurality of display sub-image codes Q j to the display device, where each point in the image of the to-be-displayed object corresponds to a grayscale value G i , where i=1, 2, . . . , m, j=1, 2, . . . , N, wherein m is the quantity of object points and N is the number of the display sub-image codes; and

the display device is configured to generate and display a plurality of sub-holograms according to the numbers of the plurality of display sub-image codes, a quantity of the plurality of sub-holograms being equal to that of the plurality of display sub-image codes, such that the plurality of sub-holograms are superimposed to generate a hologram of the image of the to-be-displayed object in human eyes.

2. The hologram display apparatus according to claim 1 , wherein the controller is further configured to determine a maximal value N of a quantity of digits according to a predetermined numeral system of base x and the plurality of grayscale values G i , divide each of the plurality of grayscale values into N digits and N weights, generate corresponding N weight groups according to the N digits, and generate corresponding N display sub-image codes according to the N weight groups, wherein, the N digits and the N weights of each of the plurality of grayscale values have a one-to-one correspondence to each other, and each of the N weight groups corresponds to a respective one of the N digits.

3. The hologram display apparatus according to claim 2 , wherein the controller is further configured to determine a maximal grayscale value G max according to the plurality of grayscale values G i , and determine the maximal value N of the quantity of the digits according to maximal grayscale value G max , N meeting the requirement of log x G max ≤(log x G max )+1.

4. The hologram display apparatus according to claim 2 , wherein the display device comprises a spatial light modulator and a backlight assembly;

the backlight assembly is configured to provide corresponding N backlight intensities according to the N display sub-image codes, and the N backlight intensities are the digits corresponding to the weight groups corresponding to the N display sub-image codes, respectively; and

the spatial light modulator is configured to generate corresponding N display sub-images according to the N display sub-image codes, and generate N sub-holograms according to the N display sub-images and the N backlight intensities and display the N sub-holograms in a time-division manner.

5. The hologram display apparatus according to claim 1 , further comprising an image acquirer, wherein the image acquirer is configured to acquire an image of the to-be-displayed object, and transmit the image of the to-be-displayed object to the controller, and the controller is configured to obtain the plurality of grayscale values G i according to the image of the to-be-displayed object.

6. A hologram display method, implemented by a hologram display apparatus comprising a controller and a display device, the hologram display method comprising steps of

S 1 : obtaining, by the controller and according to a preset image of a to-be-displayed object, a plurality of grayscale values G i of an image of the to-be-displayed object, generating, by the controller, a plurality of display sub-image codes Q j according to the plurality of grayscale values and transmitting, by the controller, the plurality of display sub-image codes Q j to the display device, where each point in the image of the to-be-displayed object corresponds to a grayscale value G i , where i=1, 2, . . . , m, j=1, 2, . . . , N, wherein m is the quantity of object points and N is the number of the display sub-image codes; and

S 2 : generating and displaying, by the display device, a plurality of sub-holograms according to the numbers of the plurality of display sub-image codes, a quantity of the plurality of sub-holograms being equal to that of the plurality of display sub-image codes, such that the plurality of sub-holograms are superimposed to generate a hologram of the image of the to-be-displayed object in human eyes.

7. The hologram display method according to claim 6 , wherein the step S 1 comprises steps of:

S 11 : determining a maximal value N of a quantity of digits according to a predetermined numeral system of base x and the plurality of grayscale values G i , and dividing each of the plurality of grayscale values into N digits and N weights, wherein, the N digits and the N weights of each of the plurality of grayscale values have a one-to-one correspondence to each other;

S 12 : generating corresponding N weight groups according to the N digits, wherein each of the N weight groups corresponds to a respective one of the N digits: and

S 13 : generating corresponding N display sub-image codes according to the N weight groups.

8. The hologram display method according to claim 7 , wherein the step S 11 comprises steps of: determining a maximal grayscale value G max according to the plurality of grayscale values G i , and determining the maximal value N of the quantity of the digits according to maximal grayscale value G max , wherein N meets the requirement of log x G max ≤(log x G max )+1.

9. The hologram display method according to claim 7 , wherein the step S 2 comprises steps of:

generating, by the display device, corresponding N display sub-images according to the N display sub-image codes, and providing, by the display device, corresponding N backlight intensities, wherein the N backlight intensities are the digits corresponding to the weight groups corresponding to the N display sub-image codes, respectively; and

generating, by the display device, corresponding N sub-holograms according to the N display sub-images and the N backlight intensities, and displaying, by the display device, the N sub-holograms in a time-division manner.

10. The hologram display method according to claim 6 , wherein the step S 1 comprises step of:

acquiring, by an image acquirer comprised in the hologram display apparatus, an image of the to-be-displayed object, transmitting, by the image acquirer comprised in the hologram display apparatus, the image of the to-be-displayed object to the controller, and obtaining, by the controller, the plurality of grayscale values G i according to the image of the to-be-displayed object.