Light adjusting member, light source module and naked eye 3D display device

Abstract

The application discloses a light adjusting component, which comprises a carrier, a grating structure arranged at an upper surface of the carrier, the grating structure being used for adjusting the light exit position of light entering the grating structure and forming a plurality of light exit areas, and a reflector arranged below the grating structure and aligned with the grating structure, the reflector being capable of redirecting light entering the reflector, a barrier area being formed between any adjacent light exit areas in the plurality of light exit areas, and the light exit areas and the barrier area being arranged alternately in sequence. The light adjusting component disclosed by the application can adjust the light exit position of light entering the light adjusting component, so that the exiting light converges to form a focal point, a real image is generated at a position far from the focal point, a parallax is generated between the real image and an image, the depth of the image is generated by using the parallax, and a 3D effect is formed. In addition, the application further discloses a light source module and a naked-eye 3D display device, which can realize the 3D display effect and reduce the loss of display brightness.

Description

Technical Field

[0001] The present invention relates to the field of stereoscopic display technology, and in particular to a light adjustment component and a light source device. Background Art

[0002] Three-dimensional (3D) display is deeply loved by consumers for its realistic and vivid expression and strong visual impact.

[0003] 3D display technologies include naked-eye 3D and glasses-wearing 3D display technologies. Among them, parallax barrier technology is one of the current mainstream naked-eye 3D display technologies. It mainly uses a liquid crystal layer and a polarizing film to create a series of light and dark stripes (parallax barriers). In stereoscopic display mode, the parallax barrier will be activated, and two parts of image information with left and right eye parallax will enter the left eye (left eye information only) and right eye (right eye information only) of the viewer independently. After processing, the viewer's brain obtains a three-dimensional sense. Parallax barrier technology is compatible with existing LCD processes and has advantages in mass production and cost. However, due to reasons such as structure and imaging principle, its picture brightness is less than half of that displayed by ordinary LCD screens, and a specific LCD screen is required to display 3D images. Therefore, it is necessary to provide a new light adjustment component and a corresponding naked-eye 3D display device that can achieve a 3D effect while reducing the loss of display brightness and is compatible with any existing ordinary LCD screen. Summary of the Invention

[0004] In order to overcome the above-mentioned defects, embodiments of the present invention provide a new light adjustment member, a light source module, and a naked-eye 3D display device, which can achieve a 3D effect while reducing the loss of display brightness.

[0005] In order to solve its technical problems, an embodiment of the present invention adopts a technical solution: a new light adjustment component is provided, including: a carrier having an upper surface; a grating structure arranged at a certain interval on the upper surface of the carrier, the grating structure being used to adjust the light exit position of the light entering the grating structure to form a plurality of light exit areas; a reflector, which is located below the grating structure and aligned with the grating structure, the reflector can redirect the light incident thereto; a barrier area is formed between any adjacent light exit areas among the plurality of light exit areas, and the light exit areas and the barrier areas are arranged alternately in sequence.

[0006] As a further improvement of the present invention, the reflector is formed on a film layer, and the film layer is located below the carrier. The reflector can be a resin body or a metal body configured on the film layer.

[0007] As a further improvement of the present invention, the light incident on the grating structure includes the light incident on the grating structure directly and the light incident on the grating structure after being reflected at least once by the reflector.

[0008] As a further improvement of the present invention, the light directed toward the spaced portions of the grating structure is at least partially emitted through the light emitting region.

[0009] As a further improvement of the present invention, it also includes an optical medium layer, which is located below the film layer, and the light is emitted to the grating structure, the reflector and the spaced portion of the grating structure through the optical medium layer.

[0010] As a further improvement of the present invention, the outgoing light formed after adjustment by the light adjustment member can be used as the light source of the display panel, and the outgoing light is mainly emitted toward the display panel through the light emitting area.

[0011] As a further improvement of the present invention, the carrier further has a lower surface opposite to the upper surface, and the reflector is formed on the lower surface of the carrier.

[0012] As a further improvement of the present invention, the shape of the grating structure can be a quadrangle, a triangle or a cylindrical lens.

[0013] On the other hand, an embodiment of the present invention further provides a light source module, including a backlight module and a light adjustment component, wherein the light adjustment component is located on the light-emitting side of the backlight module, and the light from the backlight module is emitted after being adjusted by the light adjustment component.

[0014] On the other hand, an embodiment of the present invention further provides a naked-eye 3D display device, comprising a backlight module, a light adjustment component and a display panel. The light from the backlight module is adjusted by the light adjustment component to form an outgoing light, and the outgoing light can be used as a light source for the display panel.

[0015] The beneficial effects of the present invention are as follows: the light adjustment component, light source module, and naked-eye 3D display device provided by the embodiments of the present invention adjust the emission position of light through the light adjustment component, so that the emitted light converges to form a focus, and a real image is produced at a location far from the focus. The existence of the real image and the image will produce parallax, and the parallax is used to produce a sense of depth in the image, thereby forming a 3D effect. The light adjustment component and light source module provided by the embodiments of the present invention can be directly used in conjunction with existing display panels, and are highly practical. The naked-eye 3D display device manufactured based on the light adjustment component provided by the embodiments of the present invention can produce a 3D effect without producing different images on the left and right sides, while also reducing the loss of display brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the principle of forming a 3D image by a naked-eye 3D display device provided by one embodiment of the present invention;

[0017] Figure 2 1 is a schematic structural diagram of a light adjustment member 2 provided in one embodiment of the present invention;

[0018] Figure 3 It is a schematic diagram of the light path after the light passes through the light modulation structural component;

[0019] Figure 4 Schematic diagram of a light emitting area and a barrier area formed by the adjustment action of the light adjustment member 2 provided in an embodiment of the present invention;

[0020] Figure 5 It is a structural schematic diagram of a light source module provided by an embodiment of the present invention.

[0021] The following description is made with reference to the accompanying drawings:

[0022] 1 - display panel; 2 - light adjustment component;

[0023] 3——Backlight module; 6——Light source;

[0024] 7 - light guide plate; 8 - prism sheet;

[0025] 9——reflector; 21——carrier;

[0026] 22——grating structure; 23——reflector;

[0027] 25 - spacer; 26 - optical medium layer;

[0028] 230——film layer; 302——light emitting area;

[0029] 303——Barrier area. DETAILED DESCRIPTION

[0030] A preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0031] The light adjustment component provided by the embodiment of the present invention aligns the reflector and the grating structure, redirects the light through the reflector, and cooperates with the adjustment function of the grating structure to limit the exit position of the light, so that the light converges to form a focus, and a real image is produced at a place far from the focus. The real image and the image will produce parallax, and the parallax is used to produce the depth of the image, thereby forming a 3D effect. The naked-eye 3D display device made based on the light adjustment component provided by the embodiment of the present invention does not need to produce different pictures on the left and right sides. In addition, the light adjustment component mainly adjusts the light exit position, and blocks less light, so it can achieve a 3D effect while reducing the loss of display brightness.

[0032] Figure 1This is a schematic diagram showing the principle of forming a 3D image by a naked-eye 3D display device made of a light adjustment component provided by an embodiment of the present invention. Figure 1 As shown, the naked-eye 3D display device includes a display panel 1, a light adjustment member 2, and a backlight module 3. The light adjustment member 2 is located between the display panel 1 and the backlight module 3. Light from the backlight module 3 is formed by the light adjustment member 2 into light exit areas 302 and barrier areas 303 arranged alternately in sequence. Light regulated by the light adjustment member 2 mainly passes through the light exit areas and converges to form a focal point p. A real image is produced at a location away from the focal point p. Parallax is generated between the real image and the image on the display panel. This parallax is used to generate a sense of depth in the image, thereby creating a 3D effect. The naked-eye 3D display device provided by the embodiment of the present invention has less light obstruction and mainly changes the light exit position. Therefore, compared with existing naked-eye 3D display technology, it achieves a 3D effect while reducing the loss of display brightness. In addition, the naked-eye 3D display device manufactured based on the light adjustment member in the embodiment of the present invention uses the parallax between the real image and the image to generate the sense of depth, so there is no need to produce different images on the left and right sides. It can be used with existing displays, which is highly practical.

[0033] The embodiments of the present invention are described in detail below.

[0034] Figure 2 is a structural diagram of a light adjustment component 2 provided in one embodiment of the present invention, Figure 3 This is a schematic diagram of the light path after the light passes through the light modulation structure component 2. Please refer to Figure 2 and Figure 3 As shown, the light adjustment member 2 includes a carrier 21, a grating structure 22, and a reflector 23. The carrier 21 can be, for example, a plate-like structure of a certain thickness, having an upper surface and a lower surface. The grating structure 22 is located at a certain interval on the upper surface of the carrier 21. The "upper surface" here can be understood to mean that the grating structure 22 is located exactly on the upper surface of the carrier 21, or that the grating structure 22 is located inside the carrier 21 near the upper surface, or that it slightly protrudes from the upper surface of the carrier 21. The carrier 21 is preferably made of a material with high transparency and good light transmission, such as polymethyl methacrylate (PMMA), polycarbonate (PC), cycloolefin polymer (COP), or cycloolefin copolymer (COC). Of course, other types of materials that are easy to transmit light are also acceptable.

[0035] In one embodiment of the present invention, the grating structures 22 are located at regular intervals on the upper surface of the carrier 21. If the carrier 21 is a rectangular plate-shaped structure, the grating structures 22 may be strip-shaped structures having a certain width W1 located one by one on the upper surface of the rectangular plate-shaped structure, with the strip-shaped grating structures 22 extending from one side of the carrier 21 to the other. The width W1 of the spacing portions 25 of the grating structure 22 and the width W2 of the grating structure 22 are related to the size of the pixel. The widths W1 and W2 can be adjusted based on the pixel size, with the final width being determined based on the light-transmitting area that does not block the pixel.

[0036] The grating structure 22 can be formed on the upper surface of the carrier 21 by, for example, injection molding, extrusion molding, or hot pressing. In addition, the shape of the grating structure 22 can be one or more of a quadrangle, a triangle, or a cylindrical lens. According to the grating equation: When light is perpendicular to the grating: d·sinθ m =mλ; the light incident at an angle of θ i At the time of incidence: d·(sinθ m -sinθ i )=mλ (the incident light and the diffracted light are on opposite sides of the grating normal). By setting appropriate parameters such as wavelength λ and grating constant d, the light incident on the grating structure 22 can be adjusted by the grating structure 22 to deviate from the normal θ. m The light is emitted in the direction of the angle, thereby forming a plurality of light exit areas. It can be understood that the number of light exit areas is related to the number of grating structures. It can be understood that the light exit area refers to the area through which the light passes.

[0037] Reflector 23 is positioned below grating structure 22 and aligned with grating structure 22. Alignment can mean that reflector 23 and grating structure 22 are of the same size, with the orthographic projection of grating structure 22 overlapping with reflector 23, or that reflector 23 and grating structure 22 are of different sizes, with the orthographic projection of grating structure 22 partially overlapping with reflector 23. Reflector 23 is configured to redirect a portion of the light directed toward it. For example, a portion of the light directed toward reflector 23 undergoes at least one total reflection before being directed toward the adjacent grating structure 22. Light directed toward grating structure 22, regulated by the grating structure, is emitted in a direction deviating from the normal, forming a light-exiting area. Thus, the area corresponding to grating structure 22, that is, between any adjacent light-exiting areas, forms a barrier area, because only a small amount of light passes through at most. It should be understood that a barrier area merely allows relatively little light to pass through, not that absolutely no light passes through.

[0038] The reflector 23 may be formed on a film layer 230, for example. Specifically, the film layer 230 may be polyethylene terephthalate (PET), PMMA, or other similar composite materials with high transparency. The film layer 230 may have the same shape as the carrier 21 and be located below the carrier 21. The reflector 23 may be, for example, a white or silver resin body coated on the film layer at a position aligned with the grating structure 22, or may be a metal body. Of course, it will be understood that in other embodiments of the present invention, the reflector 23 may also be directly formed on the lower surface of the carrier 21, without the need for an additional film layer 230.

[0039] The following is a detailed description of the direction of the light path after the light is emitted to the light adjustment component 2. Figure 3 As shown, the light rays incident on the light-regulating member 2 can be divided into three parts: one part directly incident on the grating structure 22, one part incident on the reflector 23, and one part incident on the space 25 between the grating structures. The portion of light rays incident directly on the grating structure 22, such as light ray a, is directly diffracted and emitted from the grating structure 22. The region where this portion of light rays exits corresponds to the light-exiting area. The portion of light rays incident directly on the grating structure 22, such as light ray b, does not exit the grating structure 22 all at once. Instead, it is reflected at least once between the grating structure 22 and the reflector 23, redirected, and then incident on the grating structure 22 again. It then exits the grating structure 22 again due to the grating diffraction effect. The light rays incident here also exit the grating structure 22 after being diffracted by the grating structure 22. Therefore, they are not distinguished from the light rays incident directly on the grating structure 22. Similarly, the region where this portion of light rays passes through also corresponds to the light-exiting area.

[0040] A portion of light, such as light d, is directed toward reflector 23 and reflected by reflector 23. It is understood that to improve light utilization, the refractive index n1 of reflector 23 can be greater than the refractive index of the surrounding light propagation medium to achieve total internal reflection. By setting the distance between grating structure 22 and reflector 23 so that the angle of incidence of light d on reflector 23 is greater than the critical angle for total internal reflection, light d directly directed toward emitter 23 undergoes total internal reflection upon encountering reflector 23, then returns to, for example, the prism sheet of the backlight module before being directed toward reflector 23 again. After multiple total internal reflections, light d ultimately reaches an adjacent grating structure 22 or the space 25 between grating structures. It is understood that due to the light redirection by reflector 23 and the light modulation by grating structure 22, the area corresponding to grating structure 22, that is, between adjacent light-emitting areas, forms a barrier region because only a small amount of light passes through at most.

[0041] A portion of light, such as light e, is directed toward the spacing portions 25 between the grating structures 22. This portion of light is refracted by normal light and then exits the carrier 21, that is, it exits through the light exit area. It is understood that a portion of light, such as light c, that is directed toward the spacing portions 25 may be refracted by normal light in the spacing portions 25 and then exit into the region corresponding to the grating structures 22, namely, the barrier region. This allows a small amount of light to pass through the barrier region, which was originally devoid of light. This indicates that the barrier region is not, in fact, devoid of light.

[0042] From the above analysis, it can be seen that the light directed toward the grating structure 22 includes the light directed toward the grating structure 22 directly and the light directed toward the grating structure 22 after being reflected at least once by the reflector 23 .

[0043] In one embodiment of the light-regulating member 2 provided by the present invention, an optical dielectric layer 26 may also be included. This optical dielectric layer 26 is located below the film layer 230 and may be made of materials such as PMMA, PC, COP, or COC. Light passes through the optical dielectric layer 26 and is directed toward the grating structure 22, the reflector 23, and the spacer 25 between the grating structures. It is understood that the optical dielectric layer 26 may alternatively be air.

[0044] Figure 4 FIG. 2 shows a schematic diagram of a light emitting area and a barrier area formed after light passes through the light adjustment member 2. Figure 4 The light exit areas 302 and barrier areas 303 are shown alternately arranged. It should be noted that the light exit areas 302 are the areas where light primarily passes through, while the barrier areas are areas where only a small amount of light passes through. In the context of the main light passage area, "mainly" generally means that at least half of the light passes through, while "a small amount" generally means that less than half of the light passes through.

[0045] The light adjustment member 2 can adjust the exit position of the light directed toward it, so that the exiting light converges to form a focus, and a real image is generated at a place far away from the focus. The real image and the image will produce parallax, and the parallax is used to generate a sense of depth of the image, thereby forming a 3D effect.

[0046] The light adjustment component provided in the embodiment of the present invention, by setting a reflector 23 and a grating structure 22, and aligning the grating structure 22 and the reflector 23, uses the reflector 23 to redirect light and the adjustment function of the grating structure 22 to adjust the exit position of the light directed thereto, so that the exiting light converges to form a focus, and a real image is generated at a place far from the focus. The existence of the real image and the image will produce parallax, and the parallax is used to produce a sense of depth of the image, thereby forming a 3D effect.

[0047] According to another embodiment of the present invention, a light source module is provided. Figure 5 FIG. 1 is a schematic diagram of a light source module structure according to an embodiment of the present invention. Figure 5 As shown, the light source module includes a backlight module 3 and a light adjustment member 2. The backlight module 3 includes a light source 6, which can be an LED, a light guide plate 7, a prism sheet 8, a reflector sheet 9, and other structures. The light adjustment member 2 has the structure described above and is located on the light-emitting side of the backlight module 3. The light from the backlight module 3 is adjusted by the light adjustment member 2 and then emitted. It can be understood that the light emitted after adjustment by the light adjustment member 2 is mainly emitted through the light-emitting area, which can converge to form a focus. The structure of the backlight module 3 can be, for example, an edge-lit or direct-lit backlight module.

[0048] According to another embodiment of the present invention, a naked-eye 3D display device is provided, comprising a backlight module, a light adjustment component, and a display panel as described above. The light from the backlight module is emitted after being adjusted by the light adjustment component, and the resulting emitted light can be used as a light source for the display panel. It can be understood that the emitted light here is mainly emitted through the light emitting area. After passing through the display panel, the emitted light converges to the focal point P, and forms a real image at a place far away from the focal point P. Parallax will be generated between the real image and the image on the display panel, and the parallax will be used to generate a sense of depth of the image, thereby forming a 3D effect. In the naked-eye 3D display device provided by the embodiment of the present invention, the light is not finally blocked or used in a time-sharing manner. Therefore, while achieving 3D display, the loss of display brightness can also be reduced.

[0049] The light adjustment member and light source module provided by the embodiments of the present invention can be directly used with existing display panels (such as liquid crystal display panels), which is highly practical. In addition, because the depth perception of the image is generated by the parallax between the real image and the image, there is no need to produce different images on the left and right sides.

[0050] Many specific details have been described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways than those described herein, and therefore the present invention is not limited to the specific implementation disclosed above. At the same time, anyone familiar with the art can use the methods and technical contents disclosed above to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Any simple modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A light adjustment member comprising: a carrier having an upper surface; A grating structure in the shape of a quadrangle, a triangle, or a cylindrical lens; the grating structure is arranged at regular intervals on the upper surface of the carrier, and the grating structure is used to adjust the light exit position of the light entering the grating structure to form multiple light exit areas; a reflector, located below the grating structure and aligned with the grating structure, capable of redirecting light incident thereon; the reflector is formed on a film layer, the film layer being located below the carrier, and the reflector is a resin body or a metal body disposed on the film layer; A barrier area through which only a small amount of light passes is formed between any adjacent light exit areas among the plurality of light exit areas, and the light exit areas and the barrier areas are alternately arranged in sequence; It also includes an optical medium layer, the optical medium layer is located below the film layer, and the light is emitted to the grating structure, the reflector and the space between the grating structure through the optical medium layer; The light adjustment member adjusts the light to achieve a 3D effect in the following manner: the light directed toward the light adjustment member is divided into three parts: one part of the light is directed directly toward the grating structure, one part of the light is directed directly toward the reflector, and one part of the light is directed toward the space between the grating structures; Part of the light that directly strikes the grating structure directly undergoes diffraction and exits the grating structure, i.e., the region where this part of the exiting light is located corresponds to forming the light exit area; part of the light that directly strikes the grating structure undergoes at least one reflection between the grating structure and the reflector, is redirected, and then strikes the grating structure again, and then exits the grating structure due to the grating diffraction effect. Similarly, the region through which this part of the exiting light passes also corresponds to forming the light exit area; Light rays that are directed directly toward the reflector undergo total reflection under the action of the reflector, and after multiple total reflections, they are ultimately directed toward the adjacent grating structure or the interval between the grating structures. That is, due to the light redirection by the reflector and the light regulation by the grating structure, only a small amount of light passes between adjacent light-emitting areas, thereby forming the barrier area accordingly. Part of the light that directly strikes the space between the grating structures is refracted by normal light and then exits the carrier, that is, the part of the light is emitted through the light exit area; part of the light that directly strikes the space between the grating structures is refracted by normal light in the space and then exits the carrier through the barrier area; That is, the light regulated by the light regulating component mainly passes through the light emitting area and converges to form a focus, and produces a real image away from the focus. The real image is located above the image on the display panel and parallax is generated between the real image and the image. The parallax is used to generate a sense of depth of the image, thereby forming a 3D effect.

2. The light adjustment member according to claim 1, wherein: The outgoing light formed after being adjusted by the light adjustment member serves as the light source of the display panel, and the outgoing light mainly passes through the light emitting area and is emitted toward the display panel.

3. The light adjustment member according to claim 1, wherein: The carrier further has a lower surface opposite to the upper surface, and the reflector is formed at the lower surface of the carrier.

4. A light source module, characterized in that: The invention comprises a backlight module and a light adjustment component according to any one of claims 1 to 3, wherein the light adjustment component is located at the light-emitting side of the backlight module, and the light from the backlight module is emitted after being adjusted by the light adjustment component.

5. A naked-eye 3D display device, comprising a backlight module, a light adjustment component according to any one of claims 1 to 3, and a display panel, wherein light from the backlight module is adjusted by the light adjustment component to form an outgoing light, and the outgoing light serves as the light source of the display panel.

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