Binocular fusion colorized waveguide display system and intelligent wearable device

Abstract

The invention provides a binocular fusion colorized waveguide display system, and relates to the technical field of intelligent wearable equipment. The system comprises a first display system and a second display system. The first display system comprises a first transmission channel; the second display system includes a second transmission channel. Light with different wavelengths is transmitted through the first transmission channel and the second transmission channel, and finally a color image is synthesized at the human eyes; wherein the brightness, hue and virtual image depth information of the images transmitted by the first transmission channel and the second transmission channel are different. According to the invention, a plurality of colors are transmitted in different channels through a left waveguide display system and a right waveguide display system, and under the conditions of certain binocular brightness difference stimulation, binocular virtual image depth information difference and binocular hue difference stimulation, virtual images with different colors, which reach human eyes through total reflection of waveguides, are superposed, so that a color display effect is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of smart wearable devices, and in particular to a binocular fusion colored waveguide display system and a smart wearable device. Background Art

[0002] With the recent development of AR and VR technologies, AR / VR glasses are now being used in the industrial sector. Many researchers have been researching holographic waveguide structures. Using a flat waveguide for image transmission requires certain conditions. When the input light source has a certain angle, the left edge light must be fully reflected, while the right edge light must enter the waveguide and meet the pupil continuity constraint for imaging performance.

[0003] For holographic waveguides, the horizontal field of view (FOV) can be derived from the first-order grating equation:

[0004]

[0005] Among them, Λ x is the lateral period of the polarization volume holographic grating (PVG), θ i is the angle of incidence in the incident medium, θ d Diffraction angle of the output medium, n i is the refractive index of the incident medium, in this case air, n g is the refractive index of the output medium, in this case the waveguide refractive index, and λ is the wavelength in vacuum. Based on the above formula, to prevent dispersion, gratings within the same layer of glass must maintain the same lateral period. Furthermore, light of different wavelengths will diffract at different angles, resulting in different FOVs.

[0006] In order to better analyze the horizontal field of view limit, you can use Figure 1 k-space analysis. If a single-layer waveguide is used for colorization (multiple gratings can be superimposed on the waveguide), the K-vector diagram shows that the left half of the blue light's field of view is limited by the waveguide's total internal reflection, while the right half of the red light's field of view is limited by continuity. As a result, the observable color FOV (RGB) is very small, exhibiting severe dispersion. Therefore, the optimal approach is to use a three-layer waveguide to transmit all three colors, achieving the green light FOV shown in the figure. However, this approach can be quite thick.

[0007] In summary, while existing holographic waveguide display solutions employ multi-layer waveguide transmission paths to expand the colorized field of view, this inevitably increases the size and weight of the waveguide system. Furthermore, the colorized field of view (FOV) of a single-layer waveguide has a theoretical limit that still fails to meet the requirements of a wide field of view, and there are serious dispersion issues, which require further resolution. Summary of the Invention

[0008] In response to the above technical problems, the present invention proposes a binocular fusion colorized waveguide display system.

[0009] The first aspect of the present invention discloses a binocular fusion color waveguide display system. The color waveguide display system includes: a first display system and a second display system;

[0010] The first display system includes a first transmission channel; the second display system includes a second transmission channel;

[0011] Light of different wavelengths is transmitted through the first and second transmission channels, and finally a color image is synthesized at the human eye; wherein, there are differences in brightness, hue and virtual image depth information between the images transmitted by the first transmission channel and the second transmission channel.

[0012] Optionally, the first display system includes a first waveguide substrate, at least one first incoupling grating and a corresponding number of first outcoupling gratings; the second display system includes a second waveguide substrate, at least two second incoupling gratings and a corresponding number of second outcoupling gratings; one incoupling grating and one corresponding outcoupling grating are responsible for diffracting light of a single wavelength;

[0013] At least one first coupling-in grating and a corresponding number of first coupling-out gratings are fixedly arranged on the first waveguide substrate. After a virtual image with a certain FOV enters the first waveguide substrate, it is diffracted by the at least one first coupling-in grating and enters the first waveguide substrate for total internal reflection. After reaching the first coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

[0014] At least two second coupling-in gratings and a corresponding number of second coupling-out gratings are fixedly arranged on the second waveguide substrate. After a virtual image with a certain FOV enters the second waveguide substrate, it is diffracted by at least two second coupling-in gratings and enters the second waveguide substrate for total reflection. After reaching the corresponding second coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

[0015] Optionally, the first display system and the second display system share a third waveguide substrate; the first display system further comprises at least one first incoupling grating and a corresponding number of first outcoupling gratings; the second display system further comprises at least two second incoupling gratings and a corresponding number of second outcoupling gratings; one incoupling grating and one corresponding outcoupling grating are responsible for diffracting light of a single wavelength;

[0016] At least one first coupling-in grating and a corresponding number of first coupling-out gratings are fixedly disposed on a third waveguide substrate. After a virtual image with a certain FOV enters the third waveguide substrate, it is diffracted by the at least one first coupling-in grating and enters the third waveguide substrate for total internal reflection. After reaching the first coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

[0017] At least two second coupling-in gratings and a corresponding number of second coupling-out gratings are fixedly arranged on the third waveguide substrate. After a virtual image with a certain FOV enters the third waveguide substrate, it is diffracted by at least two second coupling-in gratings and enters the third waveguide substrate for total reflection. After reaching the corresponding second coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

[0018] Optionally, the number of the first coupling gratings is one, two, or three; and the number of the second coupling gratings is two or three.

[0019] Optionally, when the number of the first coupling-in grating and the second coupling-out grating is two, one first coupling-in grating and one first coupling-out grating are responsible for diffracting the normal field of view FOV of the first wavelength light, and another first coupling-in grating and another first coupling-out grating are responsible for diffracting the complete FOV of the second wavelength light;

[0020] A second coupling-in grating and a second coupling-out grating are responsible for diffracting the negative field of view FOV of the first wavelength light, and another second coupling-in grating and another second coupling-out grating are responsible for diffracting the complete FOV of the third wavelength light.

[0021] Optionally, at least one first coupling-in grating and a corresponding number of first coupling-out gratings have the same transverse period Λ x1 At least two second coupling gratings and a corresponding number of second coupling gratings have the same transverse period Λ x2 .

[0022] Optionally, the coupling-in grating and the coupling-out grating are one of surface relief gratings, volume holographic gratings or liquid crystal polarization gratings.

[0023] Optionally, the coupling-in grating and the coupling-out grating are reflective liquid crystal polarizer gratings or transmissive liquid crystal polarizer gratings.

[0024] Optionally, a difference in display brightness between the first display system and the second display system is less than 20%, and a difference in transmission wavelength between the first display system and the second display system is within 100 nm.

[0025] A second aspect of the present invention discloses an intelligent wearable device, comprising the binocular fusion colored waveguide display system described in any one of the above items.

[0026] In summary, the solution proposed in the present invention has the following technical effects: compared with the existing method, the present invention transmits multiple colors through separate channels through the left and right eye waveguide display systems. Under certain conditions of binocular brightness difference stimulation, binocular virtual image depth information difference, and binocular hue difference stimulation, virtual images of different colors that reach the human eye through total reflection of the waveguide are superimposed, thereby achieving a color display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 K-vector diagram of the colorization scheme for a single-layer waveguide provided by the prior art;

[0029] Figure 2 This is a structural diagram of a binocular fusion color waveguide display system according to Example 1 of the present invention;

[0030] Figure 3 Schematic diagram of the grating structure and diffraction characteristics of the liquid crystal polarizer grating;

[0031] Figure 4 A k-space image corresponding to the waveguide display system of embodiment 1 of the present invention;

[0032] Figure 5 This is a structural diagram of a binocular fusion color waveguide display system according to Example 2 of the present invention;

[0033] Figure 6 This is a structural diagram of the binocular fusion color waveguide display system of Example 3 of the present invention.

[0034] Description of Figure Numbers in the Instruction Manual

[0035] 100 - first optical engine; 101 - second optical engine; 102 - first waveguide substrate; 103 - second waveguide substrate; 104 - human eye; 105 - first coupling-in grating; 106 - second coupling-in grating; 107 - first coupling-out grating; 108 - second coupling-out grating; 109 - third coupling-out grating; 110 - fourth coupling-out grating; 111 - third coupling-in grating; 112 - fourth coupling-in grating;

[0036] 200 - third optical engine; 201 - third waveguide substrate; 202 / 301 - first coupling-in grating for the left eye; 203 / 302 - second coupling-in grating for the left eye; 204 / 303 - first coupling-in grating for the right eye; 205 - second coupling-in grating for the right eye; 206 / 304 - first coupling-out grating for the left eye; 207 / 305 - second coupling-out grating for the left eye; 208 / 306 - first coupling-out grating for the right eye; 209 - second coupling-out grating for the right eye; 210 - left eye; 211 - right eye. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] It is difficult to achieve a large color field of view FOV due to the single-layer waveguide RGB , while achieving a large FOV RGB The need for more layers of waveguide transmission substrates makes it impossible to achieve both lightweight and color performance. Therefore, an optimized solution is needed to expand the color FOV. This invention proposes a method for increasing the color FOV by fusing different color channels binocularly. This method achieves a large color FOV with binocular vision using only one layer.

[0039] The first aspect of the present invention discloses a binocular fusion color waveguide display system. The color waveguide display system includes: a first display system and a second display system.

[0040] The first display system includes a first transmission channel, and the second display system includes a second transmission channel. Light of different wavelengths is transmitted through the first and second transmission channels, ultimately synthesizing a color image at the human eye. The images transmitted by the first and second transmission channels differ in brightness, hue, and virtual image depth information.

[0041] Optionally, the first display system includes a first waveguide substrate, at least one first incoupling grating and a corresponding number of first outcoupling gratings; the second display system includes a second waveguide substrate, at least two second incoupling gratings and a corresponding number of second outcoupling gratings; one incoupling grating and one corresponding outcoupling grating are responsible for diffracting light of a single wavelength;

[0042] At least one first coupling-in grating and a corresponding number of first coupling-out gratings are fixedly arranged on the first waveguide substrate. After a virtual image with a certain FOV enters the first waveguide substrate, it is diffracted by the at least one first coupling-in grating and enters the first waveguide substrate for total internal reflection. After reaching the first coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

[0043] At least two second coupling-in gratings and a corresponding number of second coupling-out gratings are fixedly arranged on the second waveguide substrate. After a virtual image with a certain FOV enters the second waveguide substrate, it is diffracted by at least two second coupling-in gratings and enters the second waveguide substrate for total reflection. After reaching the corresponding second coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

[0044] Optionally, the number of the first coupling gratings is one, two, or three; and the number of the second coupling gratings is two or three.

[0045] Optionally, when the number of the first coupling-in grating and the second coupling-out grating is two, one first coupling-in grating and one first coupling-out grating are responsible for diffracting the normal field of view FOV of the first wavelength light, and another first coupling-in grating and another first coupling-out grating are responsible for diffracting the complete FOV of the second wavelength light;

[0046] A second coupling-in grating and a second coupling-out grating are responsible for diffracting the negative field of view FOV of the first wavelength light, and another second coupling-in grating and another second coupling-out grating are responsible for diffracting the complete FOV of the third wavelength light.

[0047] Optionally, at least one first coupling-in grating and a corresponding number of first coupling-out gratings have the same transverse period Λ x1 At least two second coupling gratings and a corresponding number of second coupling gratings have the same transverse period Λ x2 .

[0048] Optionally, the coupling-in grating and the coupling-out grating are one of surface relief gratings, volume holographic gratings or liquid crystal polarization gratings.

[0049] Optionally, the coupling-in grating and the coupling-out grating are reflective liquid crystal polarizer gratings or transmissive liquid crystal polarizer gratings.

[0050] Optionally, a difference in display brightness between the first display system and the second display system is less than 20%, and a difference in transmission wavelength between the first display system and the second display system is within 100 nm.

[0051] Example 1:

[0052] This paper proposes a binocular fusion method to expand FOVRGB. Figure 2The system structure is shown. For the left eye, a virtual image with a certain FOV is emitted by the first light engine 100 and enters the first waveguide substrate 102. It is then diffracted by the first coupling grating 105 and the second coupling grating 106 and enters the waveguide for total internal reflection. After reaching the first coupling grating 107 and the second coupling grating 108, the light beam with a certain FOV is transmitted to the human eye 104, allowing the human eye to clearly see the virtual image at a certain distance. The first coupling grating 105 and the first coupling grating 107 are responsible for diffracting the green light's normal field of view FOV, while the second coupling grating 106 and the second coupling grating 108 are responsible for diffracting the red light's complete FOV. For the right eye, a virtual image with a certain FOV is emitted by the second light engine 101 and enters the planar waveguide substrate 103. It is then diffracted by the third and fourth coupling gratings 111 and 112, entering the waveguide for total internal reflection. After reaching the third and fourth coupling gratings 109 and 110, the beam with a certain FOV is transmitted to the human eye 104, allowing the human eye to clearly see the virtual image at a certain distance. The third coupling gratings 111 and 109 are responsible for diffracting the negative field of view (FOV) of green light, while the fourth coupling gratings 112 and 110 are responsible for diffracting the full FOV of blue light.

[0053] In addition, the first light engine 100 and the second light engine 101 can be micro-display projection optical engines such as LCoS, Micro-LED, Micro-OLED, DLP, etc. The coupling-in grating and the coupling-out grating used can be reflective gratings or transmissive gratings and attached to the surface of the first waveguide substrate 102 and the planar waveguide substrate 103. The gratings can be surface relief gratings, volume holographic gratings, or liquid crystal polarizer gratings (PVG). In this embodiment, liquid crystal polarizer gratings are used, and their grating structure and diffraction characteristics are as follows: Figure 3 (a). PVG uses the change of the LC (liquid crystal) optical axis in three-dimensional space to cause periodic changes in the refractive index. Among them, Λx is the period of the sinusoidal rotation of the liquid crystal molecules in the x direction, Λy represents the spacing between the equal refractive index surfaces in the y direction, P represents the spacing of the liquid crystal molecules rotated 360° along its optical axis, Λb is the Bragg period of PVG, which is half of P, and φ is the inclination angle of the Bragg plane. Their relationship can be derived from each other through trigonometric functions. Due to the spiral chirality of CLC, PVG has polarization-selective diffraction characteristics. Specifically, for incident light with different polarization states, PVG can selectively diffract and the polarization state of the diffracted light beam will change accordingly. As shown Figure 3 As shown in (b), a reflective, right-handed PVG will reflect right-handed circularly polarized light (RCP), while left-handed circularly polarized light (LCP) will be transmitted. A transmissive, left-handed PVG will diffract the LCP and convert the polarization state to RCP, while the incident RCP will be directly transmitted. In this embodiment, the gratings all use left-handed PVGs.

[0054] Light of different wavelengths is transmitted through the left and right channels respectively, and eventually a synthesized color image can be observed by the human eye. As for the quality of color images, color competition is likely to occur, resulting in the resulting image not being in color, and its color perception is related to visual stimulation. After many adjustments, a good color effect can be obtained when the binocular brightness difference is less than 20%, the depth information difference is not large, and the binocular wavelength difference is within 100nm. The brightness difference between the two eyes can be controlled by simulation design to adjust the light output of the light engine or the diffraction efficiency of the grating, and the same is true for the binocular wavelength difference. In addition, in K space, the color FOV range that can be achieved is as follows: Figure 4 As shown in Figure 2. In k-space, all possible light propagation directions form a circular area, and the grating performs a certain vector displacement on the light in k-space. Figure 4 As shown, the refractive index of air is 1, is the radius of the inner circle in k-space, the refractive index of the waveguide is, is the radius of the outer circle in k-space, the yellow area where the ring is located represents the field of view that the waveguide can transmit, and represents the x and y components of the normalized wave vector. Usually, the incident field of view is centrally symmetric, and the horizontal FOV can be expressed as follows through a series of vector calculations:

[0055]

[0056] For the designed grating period, the grating vector shift can be defined as follows:

[0057]

[0058] To prevent chromatic aberration and facilitate binocular image formation, in Example 1, the first input grating 105 and the second input grating 106 for the left eye, along with the first output grating 107 and the second output grating 108, must maintain a consistent lateral period Λx1. Similarly, the third input grating 111 and the fourth input grating 112 for the right eye, along with the third output grating 109 and the fourth output grating 110, must maintain a consistent lateral period Λx2. The lateral period Λx1 for the left eye can be calculated by substituting red light into Equation (2), while the lateral period Λx2 for the right eye can be calculated by substituting blue light into Equation (2).

[0059] Optionally, the first display system and the second display system share a third waveguide substrate; the first display system further comprises at least one first incoupling grating and a corresponding number of first outcoupling gratings; the second display system further comprises at least two second incoupling gratings and a corresponding number of second outcoupling gratings; one incoupling grating and one corresponding outcoupling grating are responsible for diffracting light of a single wavelength;

[0060] At least one first coupling-in grating and a corresponding number of first coupling-out gratings are fixedly disposed on a third waveguide substrate. After a virtual image with a certain FOV enters the third waveguide substrate, it is diffracted by the at least one first coupling-in grating and enters the third waveguide substrate for total internal reflection. After reaching the first coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

[0061] At least two second coupling-in gratings and a corresponding number of second coupling-out gratings are fixedly arranged on the third waveguide substrate. After a virtual image with a certain FOV enters the third waveguide substrate, it is diffracted by at least two second coupling-in gratings and enters the third waveguide substrate for total reflection. After reaching the corresponding second coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

[0062] Example 2:

[0063] The difference from Example 1 is that Figure 5 As shown, a single light engine (third light engine 200) is used and the polarization selectivity of PVG is utilized to realize a binocular colorized waveguide display system. Specifically, a first coupling grating 202 for the left eye, a second coupling grating 203 for the left eye, a first coupling grating 204 for the right eye, and a second coupling grating 205 for the right eye are stacked on a third waveguide substrate 201. The lateral period of the first coupling grating 202 for the left eye and the second coupling grating 203 for the left eye are different from the lateral period of the first coupling grating 204 for the right eye and the second coupling grating 205 for the right eye. After linearly polarized light of three colors (RGB) with a certain FOV is emitted by the third light engine 200 and enters the waveguide substrate 201, the first left-eye coupling grating 202 and the second left-eye coupling grating 203 diffract the entire field of view of red light and the positive portion of the field of view of green light into the third waveguide substrate 201 for total internal reflection. The first right-eye coupling grating 204 and the second right-eye coupling grating 205 diffract the entire field of view of blue light and the negative portion of the field of view of green light into the waveguide substrate 201 for total internal reflection. The first left-eye coupling grating 206 and the second left-eye coupling grating 207 transmit the entire field of view of red light and the positive portion of the field of view of green light to the left eye 210, while the first right-eye coupling grating 208 and the second right-eye coupling grating 209 transmit the entire field of view of blue light and the negative portion of the field of view of green light to the right eye 211. Regarding the polarization selectivity of the grating, in this embodiment, the grating responding to the left target uses a PVG responding to LCP, and the grating responding to the right target uses a PVG responding to RCP. The color FOV that can be achieved in k space is the same as Figure 4 Same as in.

[0064] Example 3:

[0065] The difference from Example 2 is that Figure 6As shown, the right eye channel transmits one color (e.g., green), while the left eye channel transmits two other colors (e.g., red and blue). Specifically, the left eye first coupling grating 301, the left eye second coupling grating 302, and the right eye first coupling grating 303 are stacked and placed on the third waveguide substrate 201. The lateral period of the left eye first coupling grating 301 and the left eye second coupling grating 302 is different from the lateral period of the right eye first coupling grating 3035. After the third light engine 200 emits linearly polarized light of RGB colors with a certain FOV into the waveguide substrate 201, the left eye first coupling grating 301 and the left eye second coupling grating 302 are responsible for diffracting the entire field of view of red light and the entire field of view of blue light into the third waveguide substrate 201 for total internal reflection. The right eye first coupling grating 303 is responsible for diffracting the entire field of view of green light into the waveguide substrate 201 for total internal reflection. The first outcoupling grating 304 for the left eye and the second outcoupling grating 305 for the left eye transmit the complete field of view of red light and the complete field of view of blue light to the left eye 210, and the first outcoupling grating 306 for the right eye transmits the complete field of view of green light to the right eye 211. As for the polarization selectivity of the grating, in this embodiment, the grating responding to the left eye adopts a PVG responding to LCP, and the grating responding to the right eye adopts a PVG responding to RCP. The color FOV that can be achieved in k-space is the same as Figure 4 Same as in.

[0066] It should be noted that binocular fusion can be achieved using a single optical engine or multiple optical engines. A dual optical engine is used with one waveguide substrate for each left and right eye. A single optical engine is used in the middle of the human eye or at the edge of a single eye, and the grating used is a polarization-selective device.

[0067] The image colors transmitted by the left and right eyes can be freely combined. The displayed color FOV is related to the color fusion effect and the combination method, and is not limited to the left eye transmitting red and green light and the right eye transmitting blue and green light.

[0068] A second aspect of the present invention discloses an intelligent wearable device, comprising the binocular fusion colored waveguide display system described in any one of the above items.

[0069] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may be modified or some or all of the technical features thereof may be replaced with equivalents, and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A binocular fusion color waveguide display system, characterized in that: The colorized waveguide display system includes: a first display system and a second display system; The first display system includes a first transmission channel; the second display system includes a second transmission channel; Light of different wavelengths is transmitted through the first and second transmission channels, and finally a color image is synthesized at the human eye; wherein, there are differences in brightness, hue and virtual image depth information between the images transmitted by the first transmission channel and the second transmission channel.

2. The colorized waveguide display system according to claim 1, wherein: The first display system includes a first waveguide substrate, at least one first incoupling grating and a corresponding number of first outcoupling gratings; the second display system includes a second waveguide substrate, at least two second incoupling gratings and a corresponding number of second outcoupling gratings; one incoupling grating and one corresponding outcoupling grating are responsible for diffracting light of a single wavelength; At least one first coupling-in grating and a corresponding number of first coupling-out gratings are fixedly arranged on the first waveguide substrate. After a virtual image with a certain FOV enters the first waveguide substrate, it is diffracted by the at least one first coupling-in grating and enters the first waveguide substrate for total internal reflection. After reaching the first coupling-out grating, a light beam with a certain FOV is transmitted to the human eye. At least two second coupling-in gratings and a corresponding number of second coupling-out gratings are fixedly arranged on the second waveguide substrate. After a virtual image with a certain FOV enters the second waveguide substrate, it is diffracted by at least two second coupling-in gratings and enters the second waveguide substrate for total reflection. After reaching the corresponding second coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

3. The colorized waveguide display system according to claim 1, wherein: The first display system and the second display system share a third waveguide substrate; the first display system further includes at least one first in-coupling grating and a corresponding number of first out-coupling gratings; the second display system further includes at least two second in-coupling gratings and a corresponding number of second out-coupling gratings; one in-coupling grating and one corresponding out-coupling grating are responsible for diffracting light of a single wavelength; At least one first coupling-in grating and a corresponding number of first coupling-out gratings are fixedly disposed on a third waveguide substrate. After a virtual image with a certain FOV enters the third waveguide substrate, it is diffracted by the at least one first coupling-in grating and enters the third waveguide substrate for total internal reflection. After reaching the first coupling-out grating, a light beam with a certain FOV is transmitted to the human eye. At least two second coupling-in gratings and a corresponding number of second coupling-out gratings are fixedly arranged on the third waveguide substrate. After a virtual image with a certain FOV enters the third waveguide substrate, it is diffracted by at least two second coupling-in gratings and enters the third waveguide substrate for total reflection. After reaching the corresponding second coupling-out grating, a light beam with a certain FOV is transmitted to the human eye.

4. The colorized waveguide display system according to any one of claims 2 or 3, characterized in that: The number of the first coupling gratings is one, two or three; the number of the second coupling gratings is two or three.

5. The colorized waveguide display system according to claim 4, wherein: When the number of the first coupling-in grating and the second coupling-out grating is two, one first coupling-in grating and one first coupling-out grating are responsible for diffracting the normal field of view FOV of the first wavelength light, and the other first coupling-in grating and the other first coupling-out grating are responsible for diffracting the complete FOV of the second wavelength light; A second coupling-in grating and a second coupling-out grating are responsible for diffracting the negative field of view FOV of the first wavelength light, and another second coupling-in grating and another second coupling-out grating are responsible for diffracting the complete FOV of the third wavelength light.

6. The colorized waveguide display system according to any one of claims 2 or 3, characterized in that: At least one first coupling-in grating and a corresponding number of first coupling-out gratings have the same transverse period At least two second coupling-in gratings and a corresponding number of second coupling-out gratings have the same transverse period 7. The colorized waveguide display system according to any one of claims 2 or 3, characterized in that: The coupling-in grating and the coupling-out grating are one of surface relief grating, volume holographic grating or liquid crystal polarization volume grating.

8. The colorized waveguide display system according to claim 7, wherein: The coupling-in grating and the coupling-out grating are reflective liquid crystal polarizer gratings or transmissive liquid crystal polarizer gratings.

9. The colorized waveguide display system according to claim 1, wherein: The display brightness difference between the first display system and the second display system is less than 20%, and the transmission wavelength difference between the first display system and the second display system is within 100 nm.

10. A smart wearable device, characterized in that: A binocular fusion colored waveguide display system comprising the binocular fusion colorization system according to any one of claims 1 to 9.

Images