CN107203050A - Double vision integration imaging 3D display methods based on holographic optical elements (HOE) - Google Patents

Abstract

The invention proposes a dual-view integrated imaging 3D display method based on a holographic optical element. The method mainly includes two processes of spatial multiplexing holographic optical element manufacturing and dual-view integrated imaging 3D display. In the manufacturing process of spatial multiplexing holographic optical elements, the parallel light wave I is vertically incident on the holographic material, and the parallel light waves II and III enter the microlens array at θ ₁ and θ ₂ respectively, and then become inclined spherical wave arrays I and II, and the parallel light waves I interferes with the inclined spherical wave arrays I and II simultaneously, and the interference fringes are recorded on the holographic material, thereby obtaining a spatially multiplexed holographic optical element; in the process of dual-view integrated imaging 3D display, the display light wave carries the information of the micro-image array And it has the same phase as the parallel light wave I and irradiates the holographic optical element, forming a left viewing area and a right viewing area in front of the holographic optical element, and presenting 3D images I and II in the left and right viewing areas, thereby realizing dual Video integrated imaging 3D display.

Description

Dual-view integrated imaging 3D display method based on holographic optical element

technical field

The invention relates to a dual-view display technology and an integrated imaging 3D display technology, in particular to a dual-view integrated imaging 3D display method based on a holographic optical element.

Background technique

Integrated imaging 3D display has the advantages of continuous viewpoint, full parallax, no eye fatigue and no need for auxiliary equipment, but there are also problems such as narrow viewing angle. Dual-view display refers to the display method of seeing different images at different viewing positions, which provides more convenience for viewers. We can use the narrow viewing angle characteristic of the integrated imaging 3D display to realize dual-view display, on the contrary, the dual-view display can increase the viewing angle of the integrated imaging 3D display.

The holographic optical element is an optical element with a lens function produced based on the principle of reflective volume holography. Because volume holography has multiplexing characteristics such as wavelength multiplexing, angle multiplexing, and phase multiplexing, it can record the optical functions of various lenses on the same holographic material, thereby obtaining a spatially multiplexed holographic optical element.

Contents of the invention

The invention proposes a dual-view integrated imaging 3D display method based on a holographic optical element. The method includes two processes of space multiplexing holographic optical element manufacturing and dual-view integrated imaging 3D display.

As shown in Figure 1, during the manufacturing process of the spatially multiplexed holographic optical element, the holographic material is closely attached to the convex surface of the microlens array, the parallel light wave I is vertically incident on the holographic material, and the parallel light wave II is incident at an oblique angle θ ₁ The microlens array forms the inclined spherical wave array I, and the parallel light wave III enters the microlens array at an inclined angle θ ₂ to form the inclined spherical wave array II, and θ ₁ = θ ₂ . The included angle between the inclined spherical wave array I and the holographic material surface is θ ₃ , the included angle between the inclined spherical wave array II and the holographic material surface is θ ₄ , and θ ₁ = θ ₃ , θ ₂ = θ ₄ , the parallel light wave I and the parallel Light waves II and III have the same wavelength and polarization state. Parallel light wave I and parallel light waves II and III are respectively incident from both sides of the holographic material. Parallel light wave I interferes with inclined spherical wave arrays I and II simultaneously, and the interference fringes are recorded in On the holographic material, a spatially multiplexed holographic optical element is obtained after post-processing.

As shown in Figure 2, in the dual-view integrated imaging 3D display process, the spatially multiplexed holographic optical element is used as a display screen, and the display light waves with micro-image array information are irradiated vertically to the spatially multiplexed holographic optical element Above, under the conditions of satisfying the Bragg angle selectivity and wavelength selectivity, the inclined spherical wave array I and the inclined spherical wave array II are reconstructed, and the left viewing area is formed in front of the inclined spherical wave array I, and the left viewing area presents a 3D image I; the right viewing area is formed in front of the inclined spherical wave array II, and the right viewing area presents a 3D image II; the viewer I sees the 3D image I in the left viewing area, and the viewer II sees 3D in the right viewing area Image II, realizing dual-view integrated imaging 3D display. When the 3D image I and the 3D image II are exactly the same, it is equivalent to an increased viewing angle of the integrated imaging 3D display.

The angle between the 3D image I formed by the left viewing area and the holographic optical element is θ ₃ , the angle between the 3D image II formed by the right viewing area and the holographic optical element is θ ₄ , and the viewing angles of 3D image I and 3D image II is φ , φ is obtained from formula (1):

φ =tan ^-1 ( p /2 f ) (1)

Where p is the pitch of the microlens array, and f is the focal length of the lens elements of the microlens array. The angle α between 3D image I and 3D image II is obtained by formula (2):

α = π-2 φ - θ ₃ - θ ₄ (2)

Bragg selection angles for holographic materials The magnitude is 10 ^-2 , when α > When , there will be no crosstalk between the 3D image I and the 3D image II.

Description of drawings

Accompanying drawing 1 is a schematic diagram of the manufacturing process of the spatial multiplexing holographic optical element

Accompanying drawing 2 is a schematic diagram of the 3D display process of dual-view integrated imaging

The pictorial labels in the above-mentioned accompanying drawings are:

1 Holographic material, 2 Microlens array, 3 Parallel light wave I, 4 Parallel light wave II, 5 Tilted spherical wave array I, 6 Parallel light wave III, 7 Tilted spherical wave array II, 8 Display light wave, 9 Holographic optical element, 10 Left view Viewing zone, 11 3D image I, 12 Right viewing viewing zone, 13 3D image II, 14 Viewer I, 15 Viewer II.

It should be understood that the above drawings are only schematic and not drawn to scale.

detailed description

A typical embodiment of the holographic optical element-based dual-view integrated imaging 3D display method of the present invention will be described in detail below, and the present invention will be further described in detail. It is necessary to point out that the following examples are only used for further description of the present invention, and cannot be interpreted as limiting the protection scope of the present invention, and those skilled in the art make some non-essential improvements to the present invention according to the above-mentioned content of the present invention And adjustments still belong to the protection scope of the present invention.

The invention proposes a double-view integrated imaging desktop 3D display method based on a holographic optical element, including two processes of spatial multiplexing holographic optical element manufacturing and dual-view integrated imaging 3D display.

During the manufacturing process of the spatially multiplexed holographic optical element, the holographic material is closely attached to the convex surface of the microlens array, the focal length of the lens elements of the microlens array is f =3.3mm, and the pitch p =1mm. Parallel light wave I is vertically incident on the holographic material, parallel light wave II enters the microlens array at an inclination angle θ ₁ to form an inclined spherical wave array I, θ ₁ =30°, and parallel light wave III enters the microlens array at an inclination angle θ ₂ to form an inclined spherical surface Wave array II, and θ ₁ = θ ₂ =30°, parallel light wave I and parallel light waves II and III have the same wavelength and polarization state, the wavelength is 632nm, and the polarization state is vertical polarization, parallel light wave I and parallel light waves II and III Incident from both sides of the holographic material respectively, the parallel light wave I interferes with the inclined spherical wave arrays I and II at the same time, the interference fringes are recorded on the holographic material, and the spatially multiplexed holographic optical element is obtained after post-processing.

In the process of dual-view integrated imaging 3D display, the spatially multiplexed holographic optical element is used as a display screen, and the display light waves with micro-image array information are irradiated to the spatially multiplexed holographic optical element at an angle of 90°. Under the conditions of satisfying the Bragg angle selectivity and wavelength selectivity, the inclined spherical wave array I and the inclined spherical wave array II are reconstructed, and the left viewing area is formed in front of the inclined spherical wave array I, and the left viewing area presents an integrated imaging 3D image I; the right viewing area is formed in front of the inclined spherical wave array II, and the right viewing area reproduces the integrated imaging 3D image II; the viewer I sees the 3D image I in the left viewing area, and the viewer II sees the 3D image in the right viewing area II. Realize dual-view area integrated imaging 3D display. When the 3D image I and the 3D image II are exactly the same, it is equivalent to an increased viewing angle of the integrated imaging 3D display. The angle between the 3D image I formed in the left viewing area and the holographic optical element is θ ₃ =30°, the angle between the 3D image II formed in the right viewing area and the holographic optical element is θ ₄ =30°, the 3D image The viewing angle φ of I and 3D image II is obtained by the formula φ =tan ^-1 ( p /2 f ) = 8.62°, and the angle α between 3D image I and 3D image II is given by the formula α = π-2 φ - θ ₃ - θ ₄ get α = 102.76°, the Bragg selection angle of the holographic material The order of magnitude is 10 ^-2 , α >> , there will be no crosstalk between the 3D image I and the 3D image II.

Claims (1)

1. the double vision integration imaging desktop 3D display methods based on holographic optical elements (HOE), it is characterised in that this method includes space Multiplexing holographic optical elements (HOE) makes and double vision integration imaging 3D shows two processes：In spatial multiplexing holographic optics member In part manufacturing process, the convex surface of holographic material and microlens array is brought into close contact, and parallel light wave I impinges perpendicularly on holographic material, Parallel light wave II is with angle of inclinationθ ₁Formed after incident microlens array and tilt spherical wave array I, parallel light wave III is with inclination angle Degreeθ ₂Formed after incident microlens array and tilt spherical wave array II, andθ ₁=θ ₂；Tilt spherical wave array I and holographic material face Angle isθ ₃, tilt spherical wave array II and the angle in holographic material face beθ ₄, andθ ₁=θ ₃,θ ₂=θ ₄, parallel light wave I and directional light Ripple II and III have identical wavelength and polarization state, and parallel light wave I is with parallel light wave II and III respectively from the two of holographic material Side is incident, and parallel light wave I is interfered simultaneously with tilting spherical wave array I and II, and interference fringe is recorded on holographic material, The holographic optical elements (HOE) of spatial multiplexing has just been obtained by post-processing；During double vision area integration imaging 3D is shown, Using spatial multiplexing holographic optical elements (HOE) as display screen, the display vertical light with micro- pattern matrix information is irradiated to sky Between multiplexing holographic optical elements (HOE) on, meeting Bragg angle selectivity and wavelength selectivity under conditions of, reconstruct and incline Oblique spherical wave array I and inclination spherical wave array II, forms left viewing vision area, left view area is in tilting in front of spherical wave array I Reveal 3D rendering I；Right viewing vision area is formed in front of spherical wave array II tilting, right viewing vision area shows 3D rendering II；See The 3D rendering II that the 3D rendering I that the person of seeing I sees in left viewing vision area, beholder II see in right viewing vision area, realizes double vision collection Shown into imaging 3D；When 3D rendering I is identical with 3D rendering II, it is equivalent to the visual angle that integration imaging 3D shows and increases； It is in the 3D rendering I of left viewing vision area formation and the angle of holographic optical elements (HOE)θ ₃, in the 3D rendering II of right viewing vision area formation Angle with holographic optical elements (HOE) isθ ₄, 3D rendering I and 3D rendering II viewing visual angleφBy formulaφ=tan^-1(p/2f) Arrive, whereinpFor the pitch of microlens array,fFor the focal length of lens cells in microlens array；Between 3D rendering I and 3D rendering II AngleαBy formulaα=π-2φ-θ ₃-θ ₄Obtain, Prague selected angle of holographic materialMagnitude be 10^-2, whenα> When, crosstalk will not occur for 3D rendering I and 3D rendering II.