Multilayer liquid crystal grating film layer and display

Abstract

The utility model discloses a multilayer liquid crystal grating film layer and a display, which belong to optical elements, and comprise a first grating layer, a wave plate layer and a second grating layer, the first grating layer and the second grating layer have the same structure, the first grating layer and the second grating layer both comprise liquid crystal layers, the wave plate layer is located between the first grating layer and the second grating layer, and the wave plate layer is located between the first grating layer and the second grating layer. An included angle is formed between the grating direction of the first grating layer and the fast axis direction of the wave plate layer, an included angle is formed between the grating direction of the second grating layer and the grating direction of the first grating layer, incident light is diffracted on the first grating layer to form a plurality of diffracted light, and each diffracted light is subjected to additional phase modulation on the wave plate layer; and each diffracted light forms a plurality of emergent light on the second grating layer, and through the design, the multilayer liquid crystal grating film layer is thin and has a plurality of split light beams.

Description

Technical Field

[0001] This utility model relates to the field of display, and in particular to multilayer liquid crystal grating film layers. Background Technology

[0002] A beam splitter is a passive device, also known as an optical splitter. It requires no external energy, only input light. A typical beam splitter consists of entrance and exit slits, a mirror, and a dispersive element. The dispersive element is the key component, and most beam splitters now use traditional photolithographic gratings. Existing beam splitting principles based on traditional gratings separate light of different wavelengths, but cannot separate light of the same wavelength.

[0003] Patent CN112987324B describes a beam splitter based on a liquid crystal polarizing grating that can split a light beam into multiple parallel beams. However, due to the gap between the two gratings, it suffers from a large thickness and a small number of split beams. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a multilayer liquid crystal grating film layer with thin thickness and multiple beams of light.

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a display with a thin thickness and a large number of beams.

[0006] One of the objectives of this utility model is achieved through the following technical solution:

[0007] A multilayer liquid crystal grating film includes a first grating layer, a waveplate layer, and a second grating layer. The first grating layer and the second grating layer have the same structure, and both the first grating layer and the second grating layer include a liquid crystal layer. The waveplate layer is located between the first grating layer and the second grating layer. The grating direction of the first grating layer forms an angle with the fast axis direction of the waveplate layer, and the grating direction of the second grating layer forms an angle with the grating direction of the first grating layer. Incident light is diffracted in the first grating layer to form multiple diffracted lights. Each diffracted light is further phase modulated in the waveplate layer, and each diffracted light forms multiple outgoing lights in the second grating layer.

[0008] Furthermore, the first grating layer includes an alignment layer and the liquid crystal layer disposed on the alignment layer.

[0009] Furthermore, the liquid crystal layer is a single-layer chiral structure.

[0010] Furthermore, the liquid crystal layer has a multilayer chiral structure.

[0011] Furthermore, the number of diffracted beams formed by the incident light is the same as the number of outgoing beams formed by each diffracted beam.

[0012] Furthermore, the number of diffracted beams is 3, and the number of emitted beams is 9.

[0013] Furthermore, the waveplate layer is a quarter-waveplate or a line-shifting plate.

[0014] Furthermore, when the waveplate layer is a 1 / 4 waveplate, the angle between the grating direction of the first grating layer and the fast axis direction of the waveplate layer is 45°.

[0015] Furthermore, when the waveplate layer is a linear offset plate, the angle between the grating direction of the first grating layer and the fast axis direction of the waveplate layer is 90°.

[0016] The second objective of this utility model is achieved by the following technical solution:

[0017] A display includes a display panel and a light source mounted on the display panel. The display also includes any of the aforementioned multilayer liquid crystal grating layers. The light source is located between the display panel and the multilayer liquid crystal grating layers, and the light source forms multiple visual virtual images through the multilayer liquid crystal grating layers.

[0018] Compared with the prior art, the multilayer liquid crystal grating film of this invention includes a first grating layer, a waveplate layer, and a second grating layer. The first grating layer and the second grating layer have the same structure and both include a liquid crystal layer. The waveplate layer is located between the first grating layer and the second grating layer. The grating direction of the first grating layer forms an angle with the fast axis direction of the waveplate layer, and the grating direction of the second grating layer forms an angle with the grating direction of the first grating layer. Incident light is diffracted in the first grating layer to form multiple diffracted beams. Each diffracted beam undergoes additional phase modulation in the waveplate layer, and each diffracted beam forms multiple outgoing beams in the second grating layer. Through the above design, the multilayer liquid crystal grating film is thin and has multiple beams. Attached Figure Description

[0019] Figure 1 This is an exploded view of the multilayer liquid crystal grating film layer of this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure of the first grating layer;

[0021] Figure 3 This is an optical path diagram of the multilayer liquid crystal grating film layer of this utility model;

[0022] Figure 4 This is a schematic diagram of the multilayer liquid crystal grating film layer of this utility model applied to an LED display;

[0023] Figure 5 This is a rendering of the first embodiment;

[0024] Figure 6 This is a rendering of the second embodiment.

[0025] In the diagram: 10. Multilayer liquid crystal grating film layer; 1. First grating layer; 11. Alignment layer; 12. Liquid crystal layer; 2. Waveplate layer; 3. Second grating layer; 100. Incident light; 110. First diffracted light; 111. First emitted light; 112. Second emitted light; 113. Third emitted light; 120. Second diffracted light; 121. Fourth emitted light; 122. Fifth emitted light; 123. Sixth emitted light; 130. Third diffracted light; 131. Seventh emitted light; 132. Eighth emitted light; 133. Ninth emitted light; 20. Display panel; 30. Light source; 40. Visual virtual image. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Please see Figure 1 This application discloses a multilayer liquid crystal grating film layer 10, which includes a first grating layer 1, a waveplate layer 2, and a second grating layer 3. The waveplate layer 2 is located between the first grating layer 1 and the second grating layer 3.

[0030] The first grating layer 1 and the second grating layer 3 have the same structure; both are liquid crystal gratings. For details, please refer to [link / reference needed]. Figure 2 The first grating layer 1 includes an alignment layer 11 and a liquid crystal layer 12. The structure of the liquid crystal layer 12 can be a single-layer chiral structure or a multi-layer chiral structure.

[0031] The grating direction of the first grating layer 1 forms an angle with the fast axis direction of the waveplate layer 2, and the grating direction of the second grating layer 3 forms an angle with the grating direction of the first grating layer 1. The waveplate layer 2 is a quarter-wave plate or a linear polarizer. When the waveplate layer 2 is a quarter-wave plate, the angle between the grating direction of the first grating layer 1 and the fast axis direction of the waveplate layer 2 is 45°. When the waveplate layer 2 is a linear polarizer, the angle between the grating direction of the first grating layer 1 and the fast axis direction of the waveplate layer 2 is 90°.

[0032] Please see Figure 3 The incident light 100 is diffracted in the first grating layer 1 to form multiple diffracted beams. Each diffracted beam undergoes additional phase modulation in the waveplate layer 2, and each diffracted beam forms multiple outgoing beams in the second grating layer 3. Specifically, in this embodiment, the incident light 100 strikes the first grating layer 1, resulting in three diffraction orders: a first diffracted beam 110, a second diffracted beam 120, and a third diffracted beam 130, corresponding to diffraction orders -1, 0, and +1, respectively. By adjusting the thickness d of the first grating layer 1, the intensities of the first diffracted beam 110, the second diffracted beam 120, and the third diffracted beam 130 can be made consistent. The first diffracted beam 110, the second diffracted beam 120, and the third diffracted beam 130 can undergo additional phase modulation in the waveplate layer 2 to adjust the polarization state of the beam. The modulated light beam passes through the second grating layer 3. The first diffracted light 110 is diffracted into the first outgoing light 111, the second outgoing light 112, and the third outgoing light 113, corresponding to diffraction orders -1, 0, and +1, respectively. The second diffracted light 120 is diffracted into the fourth outgoing light 121, the fifth outgoing light 122, and the sixth outgoing light 123, corresponding to diffraction orders -1, 0, and +1, respectively. The third diffracted light 130 is diffracted into the seventh outgoing light 131, the eighth outgoing light 132, and the ninth outgoing light 133, corresponding to diffraction orders -1, 0, and +1, respectively. Nine light spots can be seen from top to bottom.

[0033] Please continue reading. Figure 4 When the multilayer liquid crystal grating film layer 10 is applied to a display, the display includes the multilayer liquid crystal grating film layer 10, the display panel 20 and the light source 30. The light emitted by the light source 30 passes through the multilayer liquid crystal grating film layer 10 to form 9 visual virtual images 40.

[0034] Two specific embodiments of the multilayer liquid crystal grating film layer 10 are as follows:

[0035] First Embodiment

[0036] The first grating layer 1 and the second grating layer 3 have a period of 1 μm and a thickness of 1.75 μm. The incident light is natural light with a wavelength of 650 nm. The waveplate layer is a quarter-waveplate arranged at an angle of 45°. The first grating layer 1 and the second grating layer 3 are arranged at an angle of 90 degrees. Therefore, the efficiency uniformity of the nine beams is as high as 98%. Figure 5 As shown, 0-0.2 represents grayscale, 1-3 on the horizontal and vertical axes represent 9 light spots, and the values ​​in the grid represent the intensity ratio of the light beam.

[0037] Second Embodiment

[0038] The first grating layer 1 and the second grating layer 3 have a period of 1 μm and a thickness of 1.75 μm. The incident light is linearly polarized with a wavelength of 650 nm. The waveplate layer is a linear polarizer arranged at a 90° angle. With the first grating layer 1 and the second grating layer 3 arranged at a 90° angle, the efficiency uniformity of the nine beams reaches 98%. For example... Figure 6 As shown, 0-0.2 represents grayscale, 1-3 on the horizontal and vertical axes represent 9 light spots, and the values ​​in the grid represent the intensity ratio of the light beam.

[0039] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. A multilayer liquid crystal grating film layer, characterized in that: The system includes a first grating layer, a waveplate layer, and a second grating layer. The first grating layer and the second grating layer have the same structure and both include a liquid crystal layer. The waveplate layer is located between the first grating layer and the second grating layer. The grating direction of the first grating layer forms an angle with the fast axis direction of the waveplate layer, and the grating direction of the second grating layer forms an angle with the grating direction of the first grating layer. Incident light is diffracted in the first grating layer to form multiple diffracted lights. Each diffracted light undergoes additional phase modulation in the waveplate layer, and each diffracted light forms multiple outgoing lights in the second grating layer.

2. The multilayer liquid crystal grating film layer according to claim 1, characterized in that: The first grating layer includes an alignment layer and the liquid crystal layer disposed on the alignment layer.

3. The multilayer liquid crystal grating film layer according to claim 1, characterized in that: The liquid crystal layer is a single-layer chiral structure.

4. The multilayer liquid crystal grating film layer according to claim 1, characterized in that: The liquid crystal layer has a multi-layered chiral structure.

5. The multilayer liquid crystal grating film layer according to claim 1, characterized in that: The number of diffracted beams formed by the incident light is the same as the number of outgoing beams formed by each diffracted beam.

6. The multilayer liquid crystal grating film layer according to claim 5, characterized in that: The number of diffracted beams is 3, and the number of emitted beams is 9.

7. The multilayer liquid crystal grating film layer according to claim 1, characterized in that: The waveplate layer is a quarter-wave plate or a linear offset plate.

8. The multilayer liquid crystal grating film layer according to claim 7, characterized in that: When the waveplate layer is a 1 / 4 waveplate, the angle between the grating direction of the first grating layer and the fast axis direction of the waveplate layer is 45°.

9. The multilayer liquid crystal grating film layer according to claim 7, characterized in that: When the waveplate layer is a linear offset plate, the angle between the grating direction of the first grating layer and the fast axis direction of the waveplate layer is 90°.

10. A display, comprising a display panel and a light source mounted on the display panel, characterized in that: The display further includes a multilayer liquid crystal grating film layer as described in any one of claims 1-9, wherein the light source is located between the display panel and the multilayer liquid crystal grating film layer, and the light source forms a plurality of visual virtual images through the multilayer liquid crystal grating film layer.

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