阅读说明：本技术 一种超宽视角三维光场显示装置 (Ultra-wide viewing angle three-dimensional light field display device ) 是由 杨可扬 夏军 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种超宽视角三维光场显示装置。该装置包括显示屏和固定于显示屏上的两层微透镜阵列。两层微透镜阵列紧密贴合,形成一个级联的透镜系统。本发明相较于传统的三维光场显示装置具有超宽的视角,同时像差不会明显增大。(The invention discloses a super-wide viewing angle three-dimensional light field display device. The device comprises a display screen and two layers of micro-lens arrays fixed on the display screen. The two layers of micro lens arrays are tightly attached to form a cascaded lens system. Compared with the traditional three-dimensional light field display device, the three-dimensional light field display device has an ultra-wide viewing angle, and meanwhile, the aberration is not obviously increased.)

1. An ultra-wide viewing angle three-dimensional light field display device, comprising:

the display screen and a first micro-lens array and a second micro-lens array fixed on the display screen; wherein the content of the first and second substances,

the equivalent focal length of the first micro lens array and the second micro lens array is smaller than that of the first micro lens array and that of the second micro lens array.

2. The ultra-wide viewing angle three-dimensional light field display device according to claim 1, wherein the display screen is a liquid crystal screen, an OLED or a micro led.

3. The ultra-wide viewing angle three-dimensional light field display device according to claim 1, wherein the first microlens array and the second microlens array are one-dimensional arrays or two-dimensional arrays.

4. The ultra-wide viewing angle three-dimensional light field display device according to claim 1, wherein the first microlens array and the second microlens array are two-dimensional microlens arrays, the first microlens array is attached to the display screen, and the second microlens array is attached to the transparent substrate, wherein,

the first micro lens array and the second micro lens array are oppositely arranged, and a polymer is arranged between the display screen and the transparent substrate and used for fixing the display screen and the transparent substrate.

5. The ultra-wide viewing angle three-dimensional light field display device according to claim 1, wherein the first microlens array and the second microlens array are two-dimensional microlens arrays, the display device further comprising a transparent substrate, wherein,

the first micro lens array is arranged between the transparent substrate and the display screen, the first micro lens array is attached to the side face of the transparent substrate, the second micro lens array is attached to the other side of the transparent substrate, and a polymer is arranged between the display screen and the transparent substrate and used for fixing the display screen and the transparent substrate.

6. The ultra-wide viewing angle three-dimensional light field display device according to claim 1, wherein the first microlens array is a liquid crystal phase modulator attached to the display screen, and the second microlens array is a two-dimensional microlens array attached to the liquid crystal phase modulator, wherein,

the liquid crystal phase modulator superposes the phase of the Fresnel lens on incident light so as to realize ultra-wide visual angle display.

7. The ultra-wide viewing angle three-dimensional light field display device according to claim 6, wherein the liquid crystal phase modulator superimposes incident light with a phase opposite to that of the second microlens array, and the display device realizes two-dimensional light field display.

8. The ultra-wide viewing angle three-dimensional light field display device according to claim 1, wherein the first microlens array and the second microlens array are one-dimensional microlens arrays, the display screen is a micro LED display screen, the display device further comprises a transparent substrate, wherein,

the first micro lens array is arranged between the transparent substrate and the display screen, the first micro lens array is attached to the side face of the transparent substrate, the second micro lens array is attached to the other side of the transparent substrate, and a polymer is arranged between the display screen and the transparent substrate and used for fixing the display screen and the transparent substrate.

9. The ultra-wide viewing angle three-dimensional light field display device according to claim 1, wherein the light source emitted by the display screen uses collimated light to reduce crosstalk.

Technical Field

The invention relates to the field of three-dimensional light fields, in particular to a super-wide viewing angle three-dimensional light field display device.

Background

The display screen attached with the micro-lens array is one of the key methods for realizing the three-dimensional light field display at present. A single-layer micro-lens array is only attached to a traditional three-dimensional display screen, and the scheme of the device for realizing three-dimensional light field display has the defect of small field angle. In addition, the conventional lambertian surface light source emits light with a large scattering range, and thus, part of the light is easily scattered into an adjacent lens, which increases crosstalk.

Increasing the field angle can be achieved by decreasing the focal length of the microlenses. However, if a microlens with a smaller radius of curvature is used by directly changing the geometry of the microlens on the single-layer display screen, the aberration is increased, and the three-dimensional display imaging quality is reduced. Therefore, a more suitable method is needed to achieve expansion of the field angle of three-dimensional light field display.

The closely packed cascade of lenses can be viewed as a system whose equivalent focal length is determined by parameters such as the focal length of the lenses themselves. Through proper design, the cascaded micro lens array can have a smaller focal length without increasing imaging aberration. Based on the principle, a display screen attached with a cascaded two-layer lens array can be used as a three-dimensional light field display device, and the display effect of an ultra-wide viewing angle is obtained. On the other hand, the adoption of the collimated light source can reduce crosstalk and improve the three-dimensional imaging quality.

Disclosure of Invention

In view of this, an object of the present invention is to provide a super-wide viewing angle three-dimensional light field display apparatus, which adopts a method based on a cascaded microlens array, achieves a super-wide viewing angle display effect without increasing aberration, and can reduce crosstalk and improve imaging quality by adopting a collimated light source.

In order to achieve the purpose, the invention adopts the following technical scheme:

an ultra-wide viewing angle three-dimensional light field display device, comprising:

the display screen and a first micro-lens array and a second micro-lens array fixed on the display screen; wherein the content of the first and second substances,

the equivalent focal length of the first micro lens array and the second micro lens array is smaller than that of the first micro lens array and that of the second micro lens array.

Further, the display screen is a liquid crystal screen, an OLED or a MicroLED.

Further, the first microlens array and the second microlens array are one-dimensional arrays or two-dimensional arrays.

Further, the first microlens array and the second microlens array are two-dimensional microlens arrays, the first microlens array is attached to the display screen, and the second microlens array is attached to the transparent substrate,

the first micro lens array and the second micro lens array are oppositely arranged, and a polymer is arranged between the display screen and the transparent substrate and used for fixing the display screen and the transparent substrate.

Further, the first microlens array and the second microlens array are two-dimensional microlens arrays, the display device further comprises a transparent substrate, wherein,

the first micro lens array is arranged between the transparent substrate and the display screen, the first micro lens array is attached to the side face of the transparent substrate, the second micro lens array is attached to the other side of the transparent substrate, and a polymer is arranged between the display screen and the transparent substrate and used for fixing the display screen and the transparent substrate.

Further, the first microlens array is a liquid crystal phase modulator attached to the display screen, the second microlens array is a two-dimensional microlens array attached to the liquid crystal phase modulator,

the liquid crystal phase modulator superposes the phase of the Fresnel lens on incident light so as to realize ultra-wide visual angle display.

Further, the liquid crystal phase modulator superposes the phase opposite to that of the second micro lens array on the incident light, and the display device realizes two-dimensional light field display.

Further, the first micro lens array and the second micro lens array are one-dimensional micro lens arrays, the display screen is a micro LED display screen, the display device further comprises a transparent substrate, wherein,

the first micro lens array is arranged between the transparent substrate and the display screen, the first micro lens array is attached to the side face of the transparent substrate, the second micro lens array is attached to the other side of the transparent substrate, and a polymer is arranged between the display screen and the transparent substrate and used for fixing the display screen and the transparent substrate.

Further, the light source emitted by the display screen adopts collimated light to reduce crosstalk.

The invention has the beneficial effects that:

compared with the prior art, the invention has the following remarkable characteristics: firstly, the cascaded lens system has a shorter focal length, so that an ultra-wide visual angle can be generated, meanwhile, aberration cannot be increased, and the imaging quality is ensured; secondly, the display screen formed by the liquid crystal phase modulator also has the function of switching two-dimensional display and three-dimensional display; finally, using collimated light sources has the advantage of reduced crosstalk.

Drawings

Fig. 1 is a schematic diagram of an ultra-wide viewing angle three-dimensional light field display device.

Fig. 2 is a schematic side view of an ultra-wide viewing angle three-dimensional light field display device.

Fig. 3 is a schematic side view of an ultra-wide viewing angle three-dimensional light field display device.

Fig. 4 is a schematic side view of an ultra-wide viewing angle three-dimensional light field display device using a liquid crystal phase modulator.

Fig. 5 is a schematic diagram comparing the effect of the collimated light source and the lambertian area light source.

Fig. 6 is a schematic diagram of an ultra-wide viewing angle three-dimensional light field display device using a one-dimensional microlens array.

In the figure:

1-display screen, 2-first microlens array, 3-second microlens array, 4-transparent substrate, 5-polymer, 6-liquid crystal phase modulator.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 and 2, the present embodiment provides an ultra-wide viewing angle three-dimensional light field display device, which is composed of a layer of display screen 1, and a first microlens array 2 and a second microlens array 3 fixed on the display screen.

In the present embodiment, the display screen 1 is a micro led display screen.

Specifically, in the present embodiment, a schematic side view of the display device is shown in fig. 2. The display screen 1 is attached with a first micro-lens array 2, and a second micro-lens array 3 is attached on a transparent substrate 4. The display screen 1 and the side of the transparent substrate 4, which is attached with the micro-lens array, are oppositely arranged, and the transparent substrate 4 and the display screen 1 are fixed through a polymer.

According to the focal length formula of the lens system, if the focal lengths of the two layers of micro-lenses are respectively f₁And f₂The equivalent focal length of the two-layer microlens array system combination is aboutIs known as f_n<f₁And f is_n<f₂. In general, the shorter the focal length, the larger the angle of view, and therefore the display device proposed in this embodiment has a larger angle of view than the single-layer microlens array. Meanwhile, because the lens system does not adopt a lens with larger curvature, the aberration can not be increased, and the imaging quality is ensured.

Example 2

Referring to fig. 1 and 3, the present embodiment provides an ultra-wide viewing angle three-dimensional light field display device, which is composed of a layer of display screen 1, and a first microlens array 2 and a second microlens array 3 fixed on the display screen 1.

In the present embodiment, the display panel 1 is an OLED display panel.

Specifically, in the present embodiment, a schematic side view of the display device is shown in fig. 3. The two lenses are respectively attached to two sides of the transparent substrate 4. The transparent substrate 4 and the display screen 1 are fixed by polymer.

According to the focal length formula of the lens system, if the focal lengths of the two layers of micro-lenses are respectively f₁And f₂The equivalent focal length of the two-layer microlens array system combination is aboutIs known as f_n<f₁And f is_n<f₂. In general, the shorter the focal length, the larger the angle of view, and therefore the display device proposed in this embodiment has a larger size than the single-layer microlens arrayThe angle of view. Meanwhile, because the lens system does not adopt a lens with larger curvature, the aberration can not be increased, and the imaging quality is ensured.

Example 3

Referring to fig. 1 and 4, the embodiment provides an ultra-wide viewing angle three-dimensional light field display device, and a schematic side view of the display device is shown in fig. 4. The device is composed of a display screen 1, a first micro-lens array 2 and a second micro-lens array 3 attached to the first micro-lens array 2 in sequence.

Specifically, in the present embodiment, the first microlens array 2 employs a liquid crystal phase modulator 6, the second microlens array 3 is a two-dimensional microlens array, and the display panel 1 employs a liquid crystal display panel.

If the focal length f of the microlens₁The liquid crystal phase modulator 6 is loaded with the Fresnel lens phase phi₁＝g₁(x, y) having an equivalent lens focal length of f₂. The equivalent focal length of the combination of the liquid crystal phase modulator 6 and the microlens array system is about the same according to the focal length formula of the lens systemIs known as f_n<f₁And f is_n<f₂. In general, the shorter the focal length, the larger the angle of view, and therefore the display device proposed in the present embodiment has a larger angle of view than the single-layer microlens array.

Let the modulation effect of the microlens array on the display screen 1 on the light field be equivalent to the loading phase distribution of theta ═ h (x, y), and then the phase loaded on the switching liquid crystal phase modulator 6 is phi₂＝g₂(x, y) and let phi₂- θ. The total phase amount superimposed by the lens system on the incident light field is 0 at this time, and thus the two-dimensional display function is realized at this time. Switching between two-dimensional and three-dimensional display can be achieved by switching the phase loaded on the liquid crystal phase modulator 6.

Example 4

Referring to fig. 1, 3 and 5, the present embodiment provides an ultra-wide viewing angle three-dimensional light field display device. The device is composed of a layer of display screen 1, and a first micro-lens array 2 and a second micro-lens array 3 which are fixed on the display screen 1.

Specifically, in the present embodiment, the display panel 1 is a liquid crystal display panel.

Specifically, in the present embodiment, a schematic side view of the display device is shown in fig. 3. The two lenses are respectively attached to two sides of the transparent substrate 4. The transparent substrate 4 and the display screen 1 are fixed by polymer.

According to the focal length formula of the lens system, if the focal lengths of the two layers of micro-lenses are respectively f₁And f₂The equivalent focal length of the two-layer microlens array system combination is aboutIs known as f_n<f₁And f is_n<f₂. In general, the shorter the focal length, the larger the angle of view, and therefore the display device proposed in the present embodiment has a larger angle of view than the single-layer microlens array. Meanwhile, because the lens system does not adopt a lens with larger curvature, the aberration can not be increased, and the imaging quality is ensured.

The light source of the liquid crystal display screen adopts a collimation light source. As shown in fig. 5 (a), the light emitted from the collimated light source is concentrated within 90 °, and does not leak to the adjacent microlens region corresponding to the microlens directly facing thereto, and compared with the light leakage generated to the adjacent microlens region by the lambertian area light source shown in fig. 5 (b), the embodiment adopts the collimated light source mode to have less crosstalk and higher imaging quality.

Example 5

Referring to fig. 3 and 6, the present embodiment provides an ultra-wide viewing angle three-dimensional light field display device. The device is composed of a layer of display screen 1 and a first micro-lens array 2 and a second micro-lens array 3 fixed on the display screen 1.

Specifically, in the present embodiment, the first microlens array 2 and the second microlens array 3 are both one-dimensional microlens arrays, and the display screen 1 is a micro led display screen.

Specifically, in the present embodiment, a schematic side view of the display device is shown in fig. 3. The first microlens array 2 is attached to the display panel 1. The second microlens array 3 is bonded to the transparent substrate 4. The display screen 1 and the side of the transparent substrate 4, which is attached with the micro-lens array, are oppositely arranged, and the transparent substrate 4 and the display screen 1 are fixed through a polymer.

According to the focal length formula of the lens system, if the focal lengths of the two layers of micro-lenses are respectively f₁And f₂The equivalent focal length of the two-layer microlens array system combination is aboutIs known as f_n<f₁And f is_n<f₂. In general, the shorter the focal length, the larger the angle of view, and therefore the display device proposed in the present embodiment has a larger angle of view than the single-layer microlens array. Meanwhile, because the lens system does not adopt a lens with larger curvature, the aberration can not be increased, and the imaging quality is ensured.

The invention is not described in detail, but is well known to those skilled in the art.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.