TWI748529B - Holographic display device - Google Patents

Abstract

The present disclosure provides a holographic display device including a display module and a diffraction module. The display module is configured for emitting a first light including a first color light and a second color light. The diffraction module is configured to diffract the first color light in a first diffraction, and to diffract the second color light in a second diffraction. The first color light and the second color light diffracted by the diffraction module are mixed out as a second light for generating a holographic image. When the display module emits the first color light and the second color light with a same gray scale value, a ratio of luminous intensities of the first color to the second color is inversely proportional to a ratio of the first diffraction efficiency to the second diffraction efficiency, therefore, the luminous intensities of the first color light and the second color light in the second light is the same.

Description

Holographic display device

The present invention relates to the field of holographic display technology, in particular to a holographic display device.

The holographic display method combines holographic technology and waveguide technology, and achieves the purpose of superimposing virtual images with external scene images in a projection manner.

The holographic products in the prior art include a head-mounted holographic display, and the user can see a three-dimensional holographic image by wearing it on the head. In the holographic display, various colors of light source light are diffracted by a diffractive structure to obtain a diffracted image. However, the light source usually includes multiple colors of light. The diffraction efficiencies of the colors of light are all different, which often leads to a color shift in the finally obtained diffraction image.

One aspect of the present invention provides a holographic display device, including: The display module is used to emit a first light, and the first light includes a first color light and a second color light; Diffraction module, the diffraction module is arranged on the exit path of the first light, and is used to diffract the first color light in the first light with the first diffraction efficiency, and to diffract the second light Efficiency diffracts the second color light in the first light, the first diffraction efficiency is different from the second diffraction efficiency, the first color light and the second color light after being diffracted by the diffraction module The mixed color light is emitted as the second light, and the second light is used to generate a holographic image; When the display module emits the first color light and the second color light in the first light with the same grayscale value, the ratio of the luminous intensity of the first color light and the second color light in the first light It is inversely proportional to the ratio of the first diffraction efficiency to the second diffraction efficiency, so that the first color light and the second color light in the second light have the same luminous intensity.

In the above-mentioned holographic display device, the diffraction efficiency of the diffraction module for different colors of the first light emitted by the display module is different. According to the ratio of the diffraction efficiency of the diffraction module to the diffraction efficiency of the first light of the various colors, it is set When the display module emits the light of various colors in the first light with the same grayscale value, the ratio of the luminous intensity of the light of the various colors makes the light luminous intensity of the light of the various colors of the second light emitted by the holographic display device the same. That is, when the display module emits the light of various colors in the first light with the same grayscale value, the light luminous intensity of the light of each color in the second light is the same, which is beneficial to improve the color shift problem of the holographic image generated by the holographic display device. , Avoid holographic image distortion.

Example one

This embodiment provides a holographic display device. Specifically, the holographic display device may be a head-mounted holographic display device. When the holographic display device can be worn on the head of a user, it can show a three-dimensional holographic image to the user.

Please refer to FIG. 1, the holographic display device 10 provided in this embodiment includes a display module 20, a diffraction module 30, and an optical waveguide 40 arranged between the display module 20 and the diffraction module 30. The display module 20 is used for emitting the first light L ₁ , and the first light L ₁ includes the first color light, the second color light, and the third color light. In other embodiments, the first light L ₁ includes a first color light and a second color light. Diffraction module 30 is configured to after the first light L ₁ emitted for the second diffraction light, second color light comprises a first light, second color light and third color light. An optical waveguide 40 as a propagation medium, can be made of transparent optical glass or optical plastic, is provided on the emission path of the first light L _1, L ₁ for guiding a first light module 20 in the display mode and diffraction It propagates between the groups 30, and emits the second light L ₂ emitted by the diffraction module 30.

In this embodiment, the display module 20 may use a micro light emitting diode or a micro organic light emitting diode to emit the first light L _1. In other embodiments, the display module 20 may use a micro light emitting diode emitting device. The first color light and the quantum dot conversion part of the first color light are the second color light and the third color light. Referring to FIG. 2, the display module 20 defines a plurality of pixel regions 21 arranged in an array. Each pixel region 21 includes three sub-pixels 211, and each sub-pixel 211 in each pixel region 21 is used And respectively emit the first color light, the second color light and the third color light. In this embodiment, the first color light is red light (R), the second color light is green light (G), and the third color light is blue light (B). Therefore, the first light L ₁ emitted by the display module 20 can be displayed as a two-dimensional image. The first light L ₁ is diffracted by the diffraction module 30 to generate the second light L ₂ , and the second light L _{2 is} used for To generate the holographic image.

Please refer to FIG. 1 again, the display module 20 is disposed on the side of the optical waveguide 40, and the diffraction module 30 is disposed on the side of the optical waveguide 40 away from the display module 20. That is, the display module 20 and the diffraction module 30 are respectively disposed on opposite sides of the optical waveguide 40. The diffraction module 30 includes a first diffraction unit 31 and a second diffraction unit 32 spaced apart from each other. The first diffractive unit 31 is used to diffract the first light L ₁ for the first time, and the second diffractive unit 32 is used to diffract the first light L ₁ for the second time. The light emitted after being emitted is the second light L ₂ . The optical waveguide 40 is used to guide the first light L ₁ and the second light L _{2 to} propagate between the display module 20, the first diffraction unit 31 and the second diffraction unit 32.

Please continue to refer to FIG. 1, the first diffraction unit 31 includes a first diffraction element 311, a second diffraction element 312, and a third diffraction element 313. In this embodiment, the first diffraction element 311, the second diffraction element 312, and the third diffraction element 313 are diffraction gratings. The first diffraction element 311, the second diffraction element 312, and the third diffraction element 313 are stacked in sequence. The first diffractive component 311 is used to diffract _{the first color light in the first light L 1} , the second diffractive component 312 is used to diffract _{the second color light in the first light L 1} , and the third diffractive component 313 a third color light of the first _diffracted light L.

It should be understood that, in this embodiment, the first diffraction component is mainly used for a first color light 311 diffracted light L ₁ in a first, and then the first light L ₁ in a second color light and third color light passes are the first diffraction component 311, the actual occurrence of the first diffraction assembly 311 also has a certain effect on the first diffraction light in L ₁ of the second color light and the third color light, and then the first diffraction component of a first color 311 The diffraction effect of light is far greater than that of the second color light and the third color light. In the same way, the second diffractive component 312 is mainly used to diffract _{the second color light in the first light L 1} , and the diffracting effect of the second diffractive component 312 on the second color light is much greater than that of the first color light and the second color light. diffraction by the third color light; third diffraction assembly 313 is mainly used for a first diffracted light of the third color light in L _1, the third color 313 of the diffraction effect of the diffractive component of the light much greater than the third The first color light and the diffraction effect on the second color light.

That is, the first color light in L ₁ of the first light, second color light and third color light are diffracted by the first diffraction element 31 of the first component 311 and second component 312 and the third diffraction Diffraction component 313 is diffracted. Define the total diffraction efficiency of the first diffraction element 311, the second diffraction element 312, and the third diffraction element 313 for _{the first color light in the first light L 1} as the first diffraction unit 31 for the first light The diffraction efficiency of the first color light in L ₁ ; defines the total diffraction of the first diffracting element 311, the second diffracting element 312, and the third diffracting element 313 to the second color light in the _{first light L 1} emission efficiency of the first diffraction element is a diffraction efficiency of the second color light 31 of the first light in L _1; defining a first diffraction component 311, second 312 and third diffraction diffraction component 313 first the total diffraction efficiency of the third color light of the light 31 is in L ₁ of the third color light diffraction efficiency of the first light in L ₁ of the first diffraction element.

Defining a first diffraction unit 31 in L ₁ of the first light diffraction efficiency of the first color light is η _11%, 31 first diffraction light of the second color light in L ₁ of the first diffraction element defined The efficiency is η ₁₂ %, which defines the diffraction efficiency of the first diffraction unit 31 to the third color light in the _{first light L 1 as η 13} %.

Please continue to refer to FIG. 1, the second diffraction unit 32 includes a first diffraction element 321, a second diffraction element 322 and a third diffraction element 323. In this embodiment, the stacking sequence of the first diffraction element 321, the second diffraction element 322 and the third diffraction element 323 is the same as that of the first diffraction unit 31. In other embodiments, the stacking order of the first diffraction element 321, the second diffraction element 322, and the third diffraction element 323 and the first diffraction unit 31 are different. The first diffractive component 321 is used to diffract the first color light emitted from the first diffractive unit 31, the second diffractive component 322 is used to diffract the second color light emitted from the first diffractive unit 31, and the third The diffractive component 323 is used to diffract the third color light emitted from the first diffractive unit 31.

In this embodiment, the first diffraction component is mainly used for a first color light 321 diffracted light L ₁ in a first, and then the first light L ₁ in a second color light and third color light passes through the first winding are exit assembly 321, the actual occurrence of the first diffraction assembly 321 also has a certain effect on the diffraction light of the second color and the third color light in _a first light L, then the first component 321 of the diffracted light of the first color The diffraction effect is much greater than that of the second color light and the third color light. Similarly, the second diffraction component 322 is mainly used for a first diffracted light L ₁ in a second color light, the second diffraction effect of the diffractive component of the second color light 322 is much greater than for the first color light and Diffraction effect on the third color light; the third diffractive component 323 is mainly used to diffract _{the third color light in the first light L 1} , and the third diffractive component 323 has much greater diffracting effect on the third color light than Diffraction of light of the first color and light of the second color.

That is, the first color light in L ₁ of the first light, second color light and third color light are diffracted by the second diffraction element 32 of the first assembly 321, the second assembly 322, and a third diffraction The diffraction component 323 is diffracted. Define the total diffraction efficiency of the first diffraction element 321, the second diffraction element 322, and the third diffraction element 323 for _{the first color light in the first light L 1} as the second diffraction unit 32 for the first light The diffraction efficiency of the first color light in L ₁ ; defines the total diffraction of the first diffracting element 321, the second diffracting element 322, and the third diffracting element 323 to the second color light in the _{first light L 1} The diffraction efficiency is the diffraction efficiency of the second diffraction unit 32 to _{the second color light in the first light L 1} ; it is defined that the first diffraction element 321, the second diffraction element 322, and the third diffraction element 323 are the total diffraction efficiency of the light of the third color in L ₁ as a second diffraction optical element 32 on the third color light diffraction efficiency of the first light is in L _1.

Define the diffraction efficiency of the second diffraction unit 32 to the first color light as η ₂₁ %, and define the diffraction efficiency of the second diffraction unit 32 to the second color light in the _{first light L 1 as η 22} %, define The diffraction efficiency of the second diffraction unit 32 for the third color light in the _{first light L 1 is η 23} %.

Define the first diffraction efficiency of the diffraction module 30 to _{the first color light in the first light L 1 as η 1} %, η ₁ %=η ₁₁ %*η ₂₁ %; define the diffraction module 30 to the first light L 1 The second diffraction efficiency of the second color light in the light L _{1 is η 2} %, η ₂ %=η ₁₂ %*η ₂₂ %; it is defined that the diffraction module 30 responds to the third color light in the _{first light L 1} The third diffraction efficiency is η ₃ %, η ₃ %=η ₁₃ %*η ₂₃ %.

When the hologram holographic display device 10 displays images of different frames, display module 20 different light emission intensity ratio between _1, the first color light, second color light and third color light emitted from the first light L. The luminous intensity of the first color light, the second color light, and the third color light is proportional to its gray scale value, that is, the higher the gray scale value, the higher the luminous intensity, and vice versa. By adjusting the actual occurrence of the first light L ₁ in a first color light, second color light grayscale value and a third color of light emitted from the display module 20 to adjust the first color light, second color light and the third The luminous intensity of the color light realizes that the holographic display device 10 displays different holographic images.

It is defined that in the first light L ₁ , the luminous intensity of the first color light is A ₁₁ , the luminous intensity of the second color light is A ₁₂ , and the luminous intensity of the third color light is A ₁₃ . Defining a second light L _2, the first color light emission intensity is A _21, the second color light emission intensity is A _22, the light emission intensity of the third color light to A _23. Then: A ₂₁ =A ₁₁ *η ₁₁ %*η ₂₁ %, A ₂₂ =A ₁₂ *η ₁₂ %*η ₂₂ %, A ₂₃ =A ₁₃ *η ₁₃ %*η ₂₃ %.

Since the first diffraction element 31, the second diffraction element 32, respectively, the first color light, different color light diffraction efficiency of the second and the third color light, the holographic display device 10 of the second outgoing light L _2, the first a color light, the light emission intensity ratio between the second color light and the third color light different from the display module 20 in the first light L ₁ emitted first color light, the second color between the light and the third color light The ratio of the luminous intensity of the holographic display device 10 causes the holographic image displayed by the holographic display device 10 to appear color shift, which causes the holographic image to be distorted.

In this embodiment, by adjusting the first light L ₁ in a first color light, the corresponding relationship between the light emission intensity of the second color light and third color light and the color shift grayscale value ameliorate the above problems.

As mentioned above, A ₂₁ =A ₁₁ *η ₁₁ %*η ₂₁ %, A ₂₂ =A ₁₂ *η ₁₂ %*η ₂₂ %, and A ₂₃ =A ₁₃ *η ₁₃ %*η ₂₃ %. In this embodiment, when the display module 20 is set to emit the first color light, the second color light, and the third color light with the same grayscale value, the luminous intensities of the first color light, the second color light, and the third color light are different. . When the display module 20 emits the first color light, the second color light, and the third color light with the same grayscale value, the relationship between the luminous intensity of the first color light, the second color light, and the third color light is set as: A ₁₁ : A ₁₂ : A ₁₃ =1/(η ₁ %): 1/(η ₂ %): 1/(η ₃ %) can make A ₂₁ =A ₂₂ =A ₂₃ .

That is, display module 20 to the same gray scale values of the first color light outgoing light L ₁ in a first, second color light and the third color light, provided by the first light L ₁ in a first color light, The ratio between the luminous intensity of the second color light and the third color light is inversely proportional to the first diffraction efficiency, the second diffraction efficiency, and the third diffraction efficiency when the _{diffraction module 30 diffracts the first light L 1} When the display module 20 emits the first color light, the second color light, and the third color light in the _{first light L 1 with the same grayscale value, the first color light in the second light L 2} , The second color light and the third color light have the same luminous intensity.

In this embodiment, η ₁₁ %=η ₂₁ %=10%, η ₁₂ %=η ₂₂ %=23%, η ₁₃ %=η ₂₃ %=30%; η ₁ %=η ₁₁ %*η ₂₁ %= 1%, η ₂ %=η ₁₂ %*η ₂₂ %=5.29%, η ₃ %=η ₁₃ %*η ₂₃ %=9%. The display module 20 is 24 bits. Please refer to FIG. 3. When the display module 20 emits the first color light (R), the second color light (G) and the third color light (B) with the same grayscale value of 255, the first The luminous intensity ratio of the first color light, the second color light and the third color light is set as: A ₁₁ ：A ₁₂ ：A ₁₃ =1/(η ₁ %): 1/(η ₂ %): 1/(η ₃ %)=1/(1%): 1/(5.29%): 1/(9%), then A ₂₁ =A ₂₂ =A ₂₃ .

Holographic embodiment of the present embodiment provides a display device 10, different diffraction module 30 of the display module 20 of the first light L emitted in _a diffraction efficiency of the different colors of light, the module 30 according to the first diffraction light L ₁ the diffraction efficiency ratio of the various colors of light, provided the value of the display module 20 when the first light L ₁ emitted light of various colors to the same gray level than the emission intensity of each color light, so that the holographic display device 10 of the second exit The light luminous intensity of the light of various colors in the light L _{2 is the same.} That is, the display module 20 so that the same gray scale value of the first light L ₁ emitted in the light of various colors, the second light L ₂ in the same light emission intensity of each color light, help to improve the holographic display device 10 generates the holographic The color cast of the image can avoid the distortion of the holographic image.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, and are not used to limit the present invention. As long as they fall within the essential spirit of the present invention, the above embodiments are appropriately made. Changes and changes fall within the scope of protection of the present invention.

10: Holographic display device 20: Display module 21: Pixel area 211: Sub-pixel 30: Diffraction module 31: First diffraction unit 311, 321: First diffraction component 312, 322: Second diffraction components 313, 323: third diffraction assembly 32: a second diffraction unit 40: optical waveguide L _1: the first light L _2: the second light R: red light G: green light B: blue light, η _1%: a first A diffraction efficiency η ₂ %: the second diffraction efficiency η ₃ %: the third diffraction efficiency A ₁₁ , A ₁₂ , A ₁₃ : luminous intensity

FIG. 1 is a schematic structural diagram of a holographic display device provided by an embodiment of the present invention.

FIG. 2 is a schematic diagram of the pixel area distribution in the display module in FIG. 1.

FIG. 3 shows the correspondence between the gray scale values of the first light output by the display module, the luminous intensity, and the diffraction efficiency of the diffraction module.

10: Holographic display device

20: Display module

30: Diffraction module

31: The first diffraction unit

311, 321: the first diffraction component

312, 322: second diffraction component

313, 323: third diffraction component

32: The second diffraction unit

40: Optical waveguide

L ₁ : First light

L ₂ : second light

Claims (10)

A holographic display device is improved in that it includes: The display module is used to emit a first light, and the first light includes a first color light and a second color light; Diffraction module, the diffraction module is arranged on the exit path of the first light, and is used to diffract the first color light in the first light with the first diffraction efficiency, and to diffract the second light Efficiency diffracts the second color light in the first light, the first diffraction efficiency is different from the second diffraction efficiency, the first color light and the second color light after being diffracted by the diffraction module The color light is mixed and emitted as second light, and the second light is used to generate a holographic image; When the display module emits the first color light and the second color light in the first light with the same grayscale value, the ratio of the luminous intensity of the first color light and the second color light in the first light It is inversely proportional to the ratio of the first diffraction efficiency to the second diffraction efficiency, so that the first color light and the second color light in the second light have the same luminous intensity. The holographic display device according to claim 1, wherein the diffraction module includes at least a first diffraction element, and the first diffraction element is used to diffract the first color light and / Or second color light. The holographic display device according to claim 2, wherein the first light and the second light further include a third color light, and the diffraction module is used to diffract the Third color light When the display module emits the first color light, the second color light, and the third color light in the first light with the same grayscale value, the first color light and the second color light in the first light are The ratio of the luminous intensities of the third color light and the third color light is inversely proportional to the ratio of the first diffraction efficiency, the second diffraction efficiency, and the third diffraction efficiency, so that the second light The luminous intensities of the first color light, the second color light, and the third color light in are the same. The holographic display device according to claim 3, wherein the diffraction module further includes a second diffraction component and a third diffraction component; The first diffractive component is used to diffract the first color light in the first light, the second diffractive component is used to diffract the second color light in the first light, and the third The diffraction component is used to diffract the third color light in the first light. The holographic display device according to claim 4, wherein the first diffraction element, the second diffraction element, and the third diffraction element are stacked on top of each other. The holographic display device according to claim 4, wherein the holographic display device includes a first diffraction unit and a second diffraction unit that are independent of each other, and both the first diffraction unit and the second diffraction unit are It includes the first diffractive component, the second diffractive component, and the third diffractive component. The holographic display device according to claim 6, wherein in the first diffraction unit and the second diffraction unit, the first diffraction element, the second diffraction element, and the third diffraction element The stacking order of the diffractive components is the same. The holographic display device according to claim 4, wherein the diffraction component is a diffraction grating. The holographic display device according to claim 4, wherein the first color light is red light, the second color light is green light, and the third color light is blue light. The holographic display device according to claim 1, wherein the holographic display device further includes an optical waveguide disposed between the display module and the diffraction module for guiding the first One light and the second light propagate between the display module and the diffraction module.

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