Patent Application
20190129191
The present invention relates to a lenticular 3D display. More particularly, the 3D display has a fixed lenticular lens and uses a replaceable lenticular image.
Lenticular lens can provide a 3D effect with a 2D printing. The lenticular lens has a series of cylindrical lenses. Because of the refraction, the cylindrical lens can focus the sight on different area, so two eyes will see different slices under each cylindrical lens. Therefore, by slicing two or more images and arranging them alternatively under the lenticular lenses, two eyes can simultaneously see two images. This can generate an illusion of depth, or 3D effect.
Typically a lenticular display or light box utilizes a lenticular sheet which is a translucent plastic sheet with a set of small cylindrical lenses on the front side and a flat surface on the back side. Then the lenticular image can be printed on the back side of the lenticular sheet directly. The printing should be accurately aligned with the lenses. Alternatively the image can be printed on a printing substrate and bonded to the back of the lenticular sheet.
In order to realize 3D effect by lenticular in a light box, several facts should be considered. First is the viewing angle. For 3D image, the viewing angle usually is less than 30°. To achieve a narrower viewing angle, the lenticular sheet should be thicker.
Then is the density of lenses. It is usually defined by LPI (lens per inch). Typically, as the size of the image increases, the LPI of the lenticular sheet will decrease, and the thickness of the lenticular sheet should be increased in consequence. Also the larger the image size, the more difficult it becomes to properly align the lens with the image.
The viewing distance should also be considered. The viewing distance is inversely proportional to the LPI of the lenticular lens. A longer viewing distance will typically require a lower LPI.
Therefore, in order to display a lenticular 3D image with a larger size and a longer viewing distance, which is important for advertisement, the lenticular sheet should have smaller LPI and larger thickness, also the image should be aligned accurately.
But there are some disadvantages of the current technique. First, only special printing presses can print on the thick and unbending lenticular sheet. Most printers can't print on the lenticular sheet directly. This will increase the cost and limit the application. Second, the alignment is important and will take more effort. Third, the lenticular sheet can't be reused because the lenticular image is permanently printed or attached on it. Sometimes, in order to reused the lenticular sheet, the image is printed or fixed on a flat substrate, and the lenticular sheet is placed over the image. This will solve those problems but since the lenticular sheet is soft and flexible, in some area the image and the lenticular sheet can't attached together tightly. But even a tiny gap will make the image and lenses misaligned, and cause the 3D image deformed. This deformation is easier to happen and more obvious for larger size of the image.
Considering all these disadvantages mentioned above, it would be desirable to provide an apparatus which is more efficient to use.
The primary objective of the present invention is to develop a lenticular 3D display can be reused by replacing the image.
Another object of the present invention is to develop a lenticular 3D display with low cost.
The invention comprises the following, in whole or part:
A frame, a lenticular sheet, a replaceable image sheet, and a supporting board. The supporting board has a arched surface to push the image sheet to attached to the lenticular sheet tightly to achieve a better alignment and better 3D effect.
For a more complete understanding of the present invention with its objectives and distinctive features and advantages, reference is now made to the following specification and to the accompanying drawings.
In accordance with a preferred embodiment,
The lenticular sheet 40 is a translucent sheet. It has a top side with an arrange of lenses on it, and a bottom side with a flat surface. Preferably, the lenses are cylindrical lenses aligned vertically. The lenticular sheet 40 has a set of predetermined characteristics such as LIP, thickness, and shape of the lenses according to the application of the 3D display. The lenticular sheet 40 can be formed in one piece, or by attaching a lens membrane on a translucent substrate.
The lenticular sheet 40 is received in the frame 10 with the front side exposed. The lenticular sheet 40 is fixed in the frame 10, or alternatively is detachable for replacing different type of lenticular sheets for different applications. The frame 10 may also comprises a transparent screen to cover the front side of the lenticular sheet 40 for protection.
The image sheet 30 is a piece of printing media with lenticular image printed on it. The lenticular image is designed in accordance with the characteristics of the lenticular sheet 40 for achieving a desired effect, such as 3D effect, flip, or animation. The printing media could be paper, film, plastic sheet, etc. as long as the lenticular image can be printed on it with required resolution. As a result, most printers can be used to print the lenticular image.
The supporting board 20 is a substrate having a top surface. The image sheet 30 can be removably held on the top surface. The supporting board 20 may comprise a fasten feature to fasten the image sheet 30, such as one of more clips. The supporting board 20 may also comprise alignment feature to align the image film in correct position, such as protruded lines or edges to regulate the position of the image sheet 30. Therefore the image sheet 30 can be easily replaced and aligned.
Referring to
The supporting board 20 and the frame 10 can be coupled together. In this situation, the image sheet 30 is pushed by the supporting board 20 to attach to the bottom side of the lenticular sheet 40. Since the top surface of the supporting board 20 is arched or convex, and the material of the lenticular sheet 40 is flexible, the supporting board 20 will cause the lenticular sheet 40 to deform along the curve of the top surface and generate a constant tensile force, which can press the image sheet 30 on the lenticular sheet 40 tightly without any gap in between.
It is worth mentioning, the curve of the lenticular sheet 40 is very small so it won't affect the 3D image and people won't observe any deformation.
Referring to
The lenticular 3D display also comprises one or more fasteners 22 to fasten the frame 10 and the supporting board 20 when the 3D display is closed. The fastener 22 could be hook, screw, elastic latch, etc.
The lenticular 3D display also comprises a lock 50 to lock the frame 10 and the supporting board 20 together.
The lenticular 3D display may also comprises a light source. The light source may be placed in front of the lenticular sheet 40, such as inner edge of the frame 10; or behind of the supporting board 20 when the supporting board 20 is transparent. The light source could be LED, or fluorescent lamp.
Referring to
While the embodiments and alternatives of the invention have been shown and described, it will be apparent to one skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention.
