TWM653662U - Multilayer light guide plate structure and display device thereof - Google Patents

Abstract

The present invention provides a multi-layer light guide plate structure and a display device thereof, wherein the multi-layer light guide plate structure comprises a first light guide plate, a second light guide plate, a diffusion film, a reflection film, and a semi-transmissive semi-reflective film. The semi-transmissive semi-reflective film, the first light guide plate, the diffusion film, the second light guide plate, and the reflection film are stacked in adjacent layers in the order described in the light emitting direction. The light emitting direction is a normal vector pointing to the semi-transmissive semi-reflective film away from the first light guide plate. The multi-layer light guide plate structure and the display device thereof are used for a light guide plate display device capable of displaying different image patterns.

Description

Multi-layer light guide plate structure and display device thereof

The present invention provides a light guide plate structure and a display device thereof, in particular a multi-layer light guide plate structure and a display device thereof.

A light guide plate is a thin optical component used in lighting or display applications. Its main function is to guide the light from the light source and evenly distribute it to the surface of the light guide plate to achieve a uniform lighting effect for lighting equipment or a uniform display effect for display equipment. Light guide plates are generally used in backlight modules, such as LCD backlights, LED flat panel lights, light boxes, indicator lights, etc.

The design of the light guide plate enables it to guide the output of the light source across the entire surface to ensure uniform brightness and optical performance. By texturing the surface or treating it in a special way, it can ensure that the light energy is reflected and refracted within the light guide plate, ultimately achieving a uniform lighting effect. Generally, optical grade acrylic materials, such as optical grade acrylic or PC sheets, are used, and then a material with an extremely high refractive index and no light absorption is used to print light diffusion points on the bottom surface of the optical grade acrylic sheet, such as laser engraving or screen printing. By using the principle of total reflection, when light hits each light guide diffusion point, the reflected light will diffuse to various angles, and then use the diffusion point pattern design with different density and size to destroy the total reflection of light, guide the light to the front of the light guide plate, and then make the light guide plate emit light evenly.

For example, in LED lighting, the combination of light guide plates and LED light sources makes it possible to effectively utilize the point light source of LEDs to guide light to the required area to improve energy efficiency and improve lighting uniformity. This technology is common in the design of various lighting equipment, especially in situations where large areas need to be uniformly illuminated.

However, a general light guide plate usually only provides a single specific image pattern for display, and does not have the function of displaying multiple image patterns. The reason is that even if multiple display image patterns are provided, the known light guide plate structure has the problem of overlapping patterns between different layers of images when displaying different layers of images, resulting in afterimages, which in turn leads to unclear display. To solve this problem, the known technology usually adopts the method of staggering the positions of the patterns between different layers of images to avoid interference between the patterns of different layers.

Therefore, it is extremely important to provide a multi-layer light guide plate structure and a display device thereof that can display different patterns of different layers of images, and at the same time, there will be no afterimages between different layers of images, and there is no need to deliberately stagger the positions of different layers of patterns.

In view of this, the present invention provides a novel multi-layer light guide plate structure and a display device thereof, which can effectively solve the problem of afterimages of different layers of image patterns.

One aspect of the present invention provides a multi-layer light guide plate structure, comprising: a first light guide plate coupled to a first light source; a second light guide plate coupled to a second light source; a diffusion film disposed between the first light guide plate and the second light guide plate and disposed adjacent to the first light guide plate and the second light guide plate; a reflection film disposed adjacent to the second light guide plate; and a semi-transmissive semi-reflective film disposed adjacent to the first light guide plate. The semi-transmissive semi-reflective film, the first light guide plate, the diffusion film, the second light guide plate and the reflection film are stacked adjacent to each other in sequence from a light emitting direction, and the light emitting direction refers to the normal vector of the semi-transmissive semi-reflective film away from the first light guide plate.

As described above, the multi-layer light guide plate structure, wherein the first light guide plate has a first display image, the second light guide plate has a second display image, and wherein the first display image is different from the second display image.

As described above, the multi-layer light guide plate structure, wherein the first light source and the second light source are coupled to a control circuit, and the control circuit is suitable for selectively switching the first light source and the second light source respectively.

As described above, in the multi-layer light guide plate structure, the control circuit switches the first light source and the second light source respectively to display the first display image or the second display image in the light emitting direction.

As described above, the multi-layer light guide plate structure, wherein the first display image has a first pattern, the second display image has a second pattern, and wherein the first pattern and the second pattern partially overlap in the projection direction of the light emitting direction.

As described above, in the multi-layer light guide plate structure, the first light source and the second light source are located on two different sides in the projection direction of the light emitting direction.

As described above, in the multi-layer light guide plate structure, the first light guide plate and the second light guide plate can be in the shape of a flat plate, a wavy plate or a wedge-shaped plate.

As described above, in the multi-layer light guide plate structure, the dot manufacturing process of the first light guide plate and the second light guide plate can be selected from at least one of the group consisting of laser process, printing process, hot pressing process, and injection process.

As for the multi-layer light guide plate structure described above, the material of the first light guide plate and the second light guide plate can be selected from at least one of the group consisting of polymethyl methacrylate (PMMA), methyl methacrylate-styrene (MS), and polystyrene (PS).

One aspect of the present invention provides a multi-layer light guide plate display device, comprising: a light box having a base and at least one side wall, the base and at least one side wall forming a containing space; the multi-layer light guide plate structure as described above, disposed in the containing space; and a glass panel stacked on the other side of the multi-layer light guide plate structure opposite to the base, wherein the reflective film is disposed adjacent to the base, and wherein the semi-transmissive semi-reflective film is disposed adjacent to the glass panel.

By means of the multi-layer light guide plate structure and the multi-layer light guide plate display device of the present invention, through the sequential stacking of the semi-transmissive and semi-reflective film, the first light guide plate, the diffusion film, the second light guide plate, and the reflective film, the images of the first light guide plate and the second light guide plate will not interfere with each other, and the images of the first light guide plate and the second light guide plate can be switched and displayed respectively, without displaying the superimposed image or afterimage of the other light guide plate. That is, when the first light guide plate having the first display image and the second light guide plate having the different second display image receive the light source and guide the light to emit light, the partially overlapping first pattern and second pattern will not be displayed at the same time, and only the image of the light guide plate that receives the light source and guides the light to emit light will be displayed from the light emitting direction. In this way, the effect of displaying different images through multiple layers of light guide plates can be achieved, and at the same time, the images between each light guide plate will not interfere with each other or overlap or leave afterimages.

10: Multi-layer light guide plate display device

11: First display image

12: Second display image

15: Surface

100: First light guide plate

150: First light source

200: Second light guide plate

250: Second light source

300:Reflective film

400:Diffusion membrane

500: Semi-transmissive and semi-reflective film

600: Glass panel

700: Light box

900: Light emission direction

FIG1 shows a three-dimensional exploded schematic diagram of a multi-layer light guide plate display device in an embodiment of the present invention; FIG2 shows a schematic diagram of the stacking relationship of the multi-layer light guide plate structure in an embodiment of the present invention; FIG3A shows an exemplary photo of a multi-layer light guide plate display device in an embodiment of the present invention showing a mirror effect on the surface when the multi-layer light guide plate display device is not activated; FIG3B shows an exemplary photo of a first display image when the multi-layer light guide plate display device in an embodiment of the present invention is activated; FIG3C shows an exemplary photo of a second display image when the multi-layer light guide plate display device in an embodiment of the present invention is activated.

In order to explain the technical content of the new type in detail, the following is further explained in combination with the implementation method and the accompanying drawings. It should be noted that in the content of this article, terms such as "first", "second" and "third" are used to distinguish the differences between components, rather than to limit the components themselves or indicate the specific order of components. In addition, in the content of this article, when the specific quantity is not specifically indicated, the article "one" refers to one component or more than one component.

In order to fully understand the purpose, features and effects of this new model, the following specific embodiments and the attached drawings are used to explain this new model in detail.

FIG1 shows a three-dimensional exploded schematic diagram of a multi-layer light guide plate display device in an embodiment of the present invention; FIG2 shows a schematic diagram of the stacking relationship of a multi-layer light guide plate structure in an embodiment of the present invention.

As shown in FIG. 1 and FIG. 2 , a multi-layer light guide plate display device 10 of an embodiment of the present invention includes a multi-layer light guide plate structure, wherein the multi-layer light guide plate structure includes a first light guide plate 100, a second light guide plate 200, a reflective film 300, a diffusion film 400, and a semi-transmissive semi-reflective film 500.

The first light guide plate 100 is coupled to the first light source 150, and the second light guide plate 200 is coupled to the second light source 250. In an embodiment of the present invention, the first light source 150 and/or the second light source 250 may be an LED light bar, and its LED particles may be but not limited to white light, RGB, and the size of its LED particles may also be adjusted according to needs. In addition, the size of the light bar and the light plate may also be adjusted according to needs.

The reflective film 300 is stacked adjacent to the second light guide plate 200 and is located at the bottom of the multi-layer light guide plate structure.

The diffusion film 400 is disposed between the first light guide plate 100 and the second light guide plate 200, and is stacked adjacent to the first light guide plate 100 and the second light guide plate 200.

The semi-transmissive and semi-reflective film 500 is stacked adjacent to the first light guide plate 100 and is located at the top of the multi-layer light guide plate structure.

The light emitting direction 900 is the plane normal vector of the semi-transmissive and semi-reflective film 500, which is away from the direction of the adjacent first light guide plate 100, that is, the light of the multi-layer light guide plate structure is emitted outward from the semi-transmissive and semi-reflective film 500 at the top.

Among them, in the multi-layer light guide plate structure, the aforementioned first light guide plate 100, second light guide plate 200, reflective film 300, diffusion film 400 and semi-transmissive semi-reflective film 500 are stacked and arranged in the following order: the top of the multi-layer light guide plate structure, i.e. the light emitting direction 900; semi-transmissive semi-reflective film 500; first light guide plate 100; diffusion film 400; second light guide plate 200; reflective film 300; bottom of the multi-layer light guide plate structure.

Thus, through such a stacking structure, the semi-transmissive and semi-reflective film 500, the diffusion film 400, and the reflective film 300 interact and reflect each other. For example, since the semi-transmissive and semi-reflective film 500 has a mirror effect, the image of the light source is displayed only when it encounters light, making it like the characteristics of external mirror glass. It can also enhance the image of the outline of the light guide plate dots. Since the diffusion film 400 is used as the middle layer, the diffusion film 400 has an atomization effect, which can prevent the image of the second light guide plate 200 from penetrating the first light guide plate 100. In addition, in the backlight structure, the reflective film 300 is also an important component at the bottom, which can prevent light from diverging and effectively concentrate the light source and reflect it back to the light exiting direction 900 of the light exiting surface to enhance the brightness and the characteristics of the light guide plate dots. In this way, the image of the first light guide plate 100 or the second light guide plate 200 can be displayed clearly separately without interference between different layers of images, and afterimages of different layers of images will not be displayed when displaying an image of one layer.

In an embodiment of the present invention, as shown in FIG1 , a multi-layer light guide plate structure is disposed in a multi-layer light guide plate display device 10, and the multi-layer light guide plate display device 10 further includes a light box 700 for accommodating the multi-layer light guide plate structure and a glass panel 600 covering the outer side of the top. The light box 700 has a base and at least one side wall, and the base and at least one side wall form a receiving space for accommodating the multi-layer light guide plate structure, and wherein the multi-layer light guide plate structure is disposed adjacent to the base of the light box 700 with a reflective film 300. In an embodiment of the present invention, four side walls extend from four sides of the base of the light box 700. The glass panel 600 is stacked on the other side of the multi-layer light guide plate structure opposite to the base of the light box 700 and is adjacent to the semi-transmissive semi-reflective film 500, that is, it is located at the top surface of the entire multi-layer light guide plate display device 10 and is the light emitting direction 900 of the multi-layer light guide plate display device 10.

In an embodiment of the present invention, the first light guide plate 100 has a first display image, the second light guide plate 200 has a second display image, and the first display image is different from the second display image. Thus, the multi-layer light guide plate structure can display different image contents, so as to have a wider practical applicability and be suitable for different usage scenarios.

In an embodiment of the present invention, the first light source 150 and the second light source 250 are coupled to a control circuit (not shown). The control circuit may be a logic circuit or an externally controlled circuit. The control circuit may also be a control circuit for controlling the electrical signal of switching the first light source 150 and the second light source 250, such as a controller, a processor, a microprocessor, a control IC, etc. The control circuit is suitable for selectively switching the first light source 150 and the second light source 250, respectively. In an embodiment of the present invention, the control circuit is further suitable for controlling specific light-emitting units in the first light source 150 and/or the second light source 250, such as LED lamp grains of different colors or LED lamp grains in different positions, etc.

In an embodiment of the present invention, the control circuit can be used to switch the first light source 150 and the second light source 250 respectively to display the first display image or the second display image in the light output direction 900, thereby achieving automatic or manual output display image switching for application in different usage scenarios.

In an embodiment of the present invention, the first display image has a first pattern, the second display image has a second pattern, and the first pattern and the second pattern partially overlap in the projection direction of the light emitting direction 900. That is, the first light guide plate 100 and the second light guide plate 200 of different layers have different display images and patterns therein, and when the display images are observed from the light emitting direction 900, the patterns in the individual display images partially overlap at the same position, as shown in the subsequent Figures 3B and 3C. In this way, the practicality of the light guide plate image is greatly improved. Since the images of different layers will not interfere with each other, the patterns between the images of different layers can be freely designed and their spatial positions can be planned without giving way to the patterns of the images of other layers due to factors such as afterimages.

In an embodiment of the present invention, the first light source 150 and the second light source 250 are located on two different sides of the projection direction of the light emitting direction 900. That is, the first light source 150 and the second light source 250 are located at different positions, and they can be placed on the top side and the bottom side of the multi-layer light guide plate structure to reduce the space occupied by the light source itself and the space required for wiring and circuit board arrangement when they are all placed on the same side, so as to make the structure thinner. It should be noted that the first light source 150 and the second light source 250, such as light strips and light panels, are not limited in size and projection method. The projection method can be side projection or direct projection, and can be adjusted according to the structural space arrangement requirements of the actual light box or the structure of the light guide plate.

In one embodiment of the present invention, the shapes of the first light guide plate 100 and the second light guide plate 200 can be flat, wavy or wedge-shaped.

In an embodiment of the present invention, the dot manufacturing process of the first light guide plate 100 and the second light guide plate 200 can be selected from at least one of the group consisting of a laser process, a printing process, a hot pressing process, and an injection process.

In an embodiment of the present invention, the material of the first light guide plate 100 and the second light guide plate 200 can be selected from at least one of the group consisting of polymethyl methacrylate (PMMA), methyl methacrylate-styrene (MS), and polystyrene (PS).

FIG3A shows an exemplary photo of a multi-layer light guide plate display device in an embodiment of the present invention showing a mirror effect on the surface when the device is not activated; FIG3B shows an exemplary photo of a multi-layer light guide plate display device in an embodiment of the present invention showing a first display image when the device is activated; FIG3C shows an exemplary photo of a multi-layer light guide plate display device in an embodiment of the present invention showing a second display image when the device is activated.

In an embodiment of the present invention, through the aforementioned stacked structure of the multi-layer light guide plate structure, when the multi-layer light guide plate display device 10 is not activated, its surface 15 can present a clear and clean mirror effect, as shown in FIG3A. When the multi-layer light guide plate display device 10 is activated, it presents a first display image 11, as shown in the exemplary photo of FIG3B, it can be seen that the left side of the screen has a charging signal symbol pattern, the middle has a double circle pattern of X5, and the right side has a double circle pattern of X10, and the image patterns of other layers are not visible; when switching its display image, it presents a second display image 12, as shown in the exemplary photo of FIG3C, it can be seen that it presents a set of 2x5 button display interfaces, and the image patterns of other layers as shown in FIG3B are not visible. At the same time, the positions of its image patterns can overlap, without the need to design patterns that avoid each other.

In one embodiment of the present invention, the aforementioned multi-layer light guide plate structure or multi-layer light guide plate display device can be further integrated into a light-transmissive touch panel to serve as an image luminous backplane of a touch screen, and images and patterns such as touch buttons can be displayed on the multi-layer light guide plate structure, so as to be applied to the touch panel of a gaming machine or a gambling machine, and replace physical keys and buttons.

By means of the multi-layer light guide plate structure and the multi-layer light guide plate display device of the present invention, through the sequential stacking of the semi-transmissive and semi-reflective film, the first light guide plate, the diffusion film, the second light guide plate, and the reflective film, the images of the first light guide plate and the second light guide plate will not interfere with each other, and the images of the first light guide plate and the second light guide plate can be switched and displayed respectively, without displaying the superimposed image or afterimage of the other light guide plate. That is, when the first light guide plate having the first display image and the second light guide plate having the different second display image receive the light source and guide the light to emit light, the partially overlapping first pattern and second pattern will not be displayed at the same time, and only the image of the light guide plate that receives the light source and guides the light to emit light will be displayed from the light emitting direction. In this way, the effect of displaying different images through multiple layers of light guide plates can be achieved, and at the same time, the images between each light guide plate will not interfere with each other or overlap or leave afterimages.

The present invention has been disclosed in the above text with a preferred embodiment, but those familiar with the art should understand that the embodiment is only used to describe the present invention and should not be interpreted as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to the embodiment should be included in the scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the patent application.

10: Multi-layer light guide plate display device

100: First light guide plate

150: First light source

200: Second light guide plate

250: Second light source

300:Reflective film

400:Diffusion membrane

500: Semi-transmissive and semi-reflective film

600: Glass panel

700: Light box

900: Light emission direction

Claims (10)

A multi-layer light guide plate structure includes: a first light guide plate coupled to a first light source; a second light guide plate coupled to a second light source; a diffusion film disposed between the first light guide plate and the second light guide plate and stacked adjacent to the first light guide plate and the second light guide plate; a reflection film stacked adjacent to the second light guide plate; and a semi-transmissive semi-reflective film stacked adjacent to the first light guide plate, wherein the semi-transmissive semi-reflective film, the first light guide plate, the diffusion film, the second light guide plate and the reflection film are stacked adjacent to each other in sequence from a light emitting direction, and wherein the light emitting direction refers to the normal vector of the semi-transmissive semi-reflective film away from the first light guide plate. A multi-layer light guide plate structure as described in claim 1, wherein the first light guide plate has a first display image, the second light guide plate has a second display image, and wherein the first display image is different from the second display image. A multi-layer light guide plate structure as described in claim 2, wherein the first light source and the second light source are coupled to a control circuit, and the control circuit is suitable for selectively switching the first light source and the second light source respectively. The multi-layer light guide plate structure as described in claim 3, wherein the control circuit is used to display the first display image or the second display image in the light emitting direction by switching the first light source and the second light source respectively. A multi-layer light guide plate structure as described in claim 2, wherein the first display image has a first pattern, the second display image has a second pattern, and wherein the first pattern and the second pattern partially overlap in the projection direction of the light emitting direction. The multi-layer light guide plate structure as described in claim 1, wherein the projection directions of the first light source and the second light source in the light emitting direction are located on two different sides. The multi-layer light guide plate structure as described in claim 1, wherein the shapes of the first light guide plate and the second light guide plate can be flat, wavy or wedge-shaped. The multi-layer light guide plate structure as described in claim 1, wherein the dot manufacturing process of the first light guide plate and the second light guide plate can be selected from at least one of the group consisting of laser process, printing process, hot pressing process, and injection process. The multi-layer light guide plate structure as described in claim 1, wherein the material of the first light guide plate and the second light guide plate can be selected from at least one of the group consisting of polymethyl methacrylate (PMMA), methyl methacrylate-styrene (MS), and polystyrene (PS). A multi-layer light guide plate display device comprises: a light box having a base and at least one side wall, wherein the base and the at least one side wall form a containing space; a multi-layer light guide plate structure as described in any one of claims 1 to 9, disposed in the containing space; and a glass panel stacked on the other side of the multi-layer light guide plate structure opposite to the base, wherein the reflective film is disposed adjacent to the base, and wherein the semi-transmissive semi-reflective film is disposed adjacent to the glass panel.