TW202318076A - Stereoscopic optical film for display device including a semi-cylindrical lens array and a transparent covering layer - Google Patents

Abstract

The invention discloses a stereoscopic optical film for a display device, which relates to the autostereoscopic 3D technical field and includes a semi-cylindrical lens array and a transparent covering layer. The covering layer is positioned above the semi-cylindrical lens array and one side of the covering layer is laminated with the curved side of the semi-cylindrical lens array. The surface of the rugged semi-cylindrical lens array of the invention becomes flat, is not easily scratched, and is conducive to cleaning. It is not easy to leave foreign matters in the gap between adjacent lenses, thereby greatly improving the problem of poor imaging effect caused by easy damage and contamination of the existing stereoscopic display optical films.

Description

Stereoscopic display optical film for display device

The invention relates to the field of glasses-free 3D technology, in particular to a three-dimensional display optical film for a display device.

In recent years, products that use liquid crystal displays (LCDs) as the interface for real-time output of information have been continuously introduced, ranging from PDAs, mobile phones, satellite navigation systems, digital cameras to LCD TVs, covering various types and sizes. Among them, 3D display is already one of the mainstream development technologies of future displays. 3D stereoscopic displays are mainly divided into two types: glasses-wearing type and naked-eye type. As far as the current market application is concerned, the display with glasses has a wider viewing angle and can be viewed on a large screen, which is more suitable for consumers' usage habits and scenarios, such as cinema projection screens, TVs, and notebook computer monitors. The naked-eye type is suitable for single use due to the limited viewing angle. In addition, the viewing distance is relatively short, and considering the convenience, it is more suitable for small-sized screens, such as digital photo frames, camera screens, and mobile phone screens. Glasses-free 3D display technology has been developed for a period of time, and can be at least divided into holographic, volumetric, multi-plane and 2D multiplex technology categories. Among them, the 2D multiplexing method is most compatible with the existing TFT flat panel display technology, and can be further divided into time multiplexing and space multiplexing.

The time multiplexing mode adopts 120Hz fast switching liquid crystal, and the resolution is higher, which is twice that of the space multiplexing mode. At present, the directional backlight (directional backlight) technology jointly launched by 3M Company and Mitsubishi Group is the mainstream. It uses the LEDs of the backlight module to emit sequential light sources, which can be projected to the left and right eyes in conjunction with the panel display image, causing parallax to produce 3D Effect. The key lies in 3M's 3D optical film (3D optical film). This kind of membrane structure requires ultra-precision processing technology, and 3M has completed the relevant patent layout. Therefore, although the market response for related products is enthusiastic, for example, Fuji FINEPIXReal3D series digital cameras and digital photo frames adopt this time-multiplexing method to display 3D images, but due to manufacturing process and patent factors, domestic display manufacturers still face high obstacles in developing related 3D display technologies. .

The spatial multiplexing method is divided into a semi-cylindrical lens array using a cylindrical mirror film and a parallel mask using a black and white grating film (parallax barrier). The advantage of the semi-cylindrical lens array (lenstic lens array) is that it will not sacrifice the brightness of the screen, but it will cause a serious drop in resolution when there are multiple viewing angles. However, due to the manufacturing accuracy of the lens and the difficulty of aligning with the display panel Extremely high, so the production cost is higher than the parallel mask type. The parallel mask (parallax barrier) adopts the printed optical film design, so the cost is lower than that of the lenticular lens. When it is applied to the 3D display technology, it only needs to add another process during the assembly process of the panel system. Although these two spatial multiplexing methods can display stereoscopic images, they have a disadvantage of low stereoscopic image resolution.

Although the cost of the semi-cylindrical lens array (lensticular lens array) of the above spatial multiplexing type is higher than that of the parallel mask type, it is still widely used in the market due to its higher brightness. Figure 4 is a schematic diagram of a semi-cylindrical lens array (lensticular lens array) with spatial multiplexing, which is characterized in that the cylindrical lens diaphragm is aligned with the panel pixels to provide images received by the left eye and The images received by the right eye are visually combined to form a stereoscopic image. The advantage of this technology is that the implementation is simple. But there are following disadvantages; first: the outermost layer is a columnar structure, which is easy to affect the three-dimensional image due to foreign matter pollution, scratches and cleaning. Second: The columnar structure has a large radius of curvature, small period, and extremely small contour depth. During processing, the optical effect may deviate from the design value due to poor transfer rate;

The purpose of the present invention is to solve the problem that the surface of the semi-cylindrical lens array film in the stereoscopic display optical film for display devices in the prior art is easily polluted by foreign matter and difficult to clean, thus affecting the naked-eye 3D imaging of the final display device. The invention provides a stereoscopic display optical film for a display device.

Technical scheme of the present invention is as follows:

A three-dimensional display optical film for a display device, comprising a semi-cylindrical lens array and a transparent cover layer, the cover layer is located above the semi-cylindrical lens array and one side of the cover layer is bonded to the curved side of the semi-cylindrical lens array.

n ₂，其中，n ₂為所述半圓柱狀透鏡陣列的折射率，所述半圓柱狀透鏡陣列中單個透鏡的曲率半徑為

,其中，

為所述半圓柱狀透鏡陣列的折光力。 Further, the refractive index n ₁ of the covering layer satisfies: n ₁

n ₂ , wherein, n ₂ is the refractive index of the semi-cylindrical lens array, and the radius of curvature of a single lens in the semi-cylindrical lens array is

,in,

is the refractive power of the semicylindrical lens array.

Preferably, the plurality of lenses of the semi-cylindrical lens array are integrally formed.

Further, the surface of the covering layer has a submicron structure.

After adopting the above scheme, the beneficial effects of the present invention are:

(1) The surface of the uneven semi-cylindrical lens array of the present invention becomes flat, not easy to be scratched, and is conducive to cleaning, and it is not easy to leave foreign matter in the gap between adjacent lenses, thereby greatly improving the existing The stereoscopic optical display film is easy to be damaged and polluted, which causes poor imaging effect.

(2) The surface after tanning is not easy to detect the distribution of refractive index and microstructure morphology by optical means such as microscopes, which can prevent imitation by other manufacturers.

(3) Reduced Morse fringes.

(4) The transfer rate between the two adjacent lenses of the semi-cylindrical lens array after the radius of curvature is reduced increases, which greatly reduces the difficulty of the processing of the semi-cylindrical lens array and avoids problems caused by poor transfer rates. As a result, the optical effect of the diaphragm deviates from the design value.

(5) The integrally formed semi-cylindrical lens array is easier to process.

As shown in Figure 3, the pixel 11 of the display image in the display device, the top of the pixel 11 is a glass sheet 12, that is, the screen of the display device, the top of the glass sheet is an upper polarizer 13, and the top of the upper polarizer 13 is bonded by The optical film 14 composed of the semi-cylindrical lens array 141 and the cover layer 142, the pixel 11 passes through the semi-cylindrical lens array 141 and the cover layer 142, passes through the right-eye light 15a, reaches the user's right eye 16a, and passes through the left-eye light 15b. It reaches the user's left eye 16b, thereby realizing stereoscopic display.

Below, the present invention will be described more clearly and completely in conjunction with multiple embodiments.

Example 1

In this embodiment, a transparent covering layer 142 is attached above the semicylindrical lens array 141, and one side of the covering layer 142 is attached to the curved surface side of the semicylindrical lens array, and the semicylindrical lens array 141 and the covering layer 142 together constitute the stereoscopic display optical film of the present invention, the specific structure of which is shown in FIG. 1 . For the existing diaphragm, as shown in Figure 2, the semi-cylindrical lens array 141 is directly exposed to the outside, and the surface is an uneven structure, as shown in Figure 1, and the setting of the covering layer 142 in this embodiment It makes the original uneven surface flat, not easy to be scratched, and is conducive to cleaning, and it is not easy to leave foreign matter in the gap between adjacent lenses, thus greatly improving the existing three-dimensional optical display film that is easy to be damaged And the problem of poor imaging effect caused by pollution. At the same time, a layer of structure is added above the semi-cylindrical lens array 141, and the planarized surface is not easy to detect the distribution of the refractive index and the microstructure morphology by optical means such as a microscope, which can prevent imitation by other manufacturers.

When the cover layer 142 is not covered, the refractive power _F1 of the semi-cylindrical lens array 141 is:

代表半圓柱狀透鏡陣列141的折射率；在覆蓋了覆蓋層142的時候，整個光學膜片的折光力F ₂為：

Representing the refractive index of the semi-cylindrical lens array 141; when covering the cover layer 142, the refractive power _F of the entire optical film is:

代表覆蓋層142的折射率。如果要保證覆蓋前和覆蓋後的成像效果不受影響，必須要保證覆蓋前和覆蓋後的折光力不變，覆蓋層的折射率n ₁大小滿足： n ₁

n ₂，在保證了折光力

=

後，必須要保證半圓柱狀透鏡陣列141的曲率半徑相對於現有技術進行減小，

，曲率半徑減小前（現有技術）的半圓柱狀透鏡陣列141結構示意圖如圖2所示，曲率半徑減小後（現有技術）的半圓柱狀透鏡陣列141結構示意圖如圖3所示，曲率半徑減小後的半圓柱狀透鏡陣列141的兩個相鄰透鏡之間的轉寫率增大，大大減小了半圓柱狀透鏡陣列141加工過程的難度，避免了因為轉寫率不佳而造成膜片光學效果偏離設計值的問題。 in,

represents the refractive index of the cladding layer 142 . If you want to ensure that the imaging effect before and after covering is not affected, you must ensure that the refractive power before and after covering remains unchanged, and the refractive index n ₁ of the covering layer satisfies: n ₁

n ₂ , when the refractive power is guaranteed

=

Finally, it must be ensured that the radius of curvature of the semi-cylindrical lens array 141 is reduced compared to the prior art,

, the structure diagram of the semi-cylindrical lens array 141 before the radius of curvature is reduced (the prior art) is shown in Figure 2, and the structure diagram of the semi-cylindrical lens array 141 after the radius of curvature is reduced (the prior art) is shown in Figure 3, the curvature The transfer rate between the two adjacent lenses of the semi-cylindrical lens array 141 after the radius is reduced increases, which greatly reduces the difficulty of the processing of the semi-cylindrical lens array 141 and avoids failure due to poor transfer rate. This causes the problem that the optical effect of the diaphragm deviates from the design value.

Example 2

On the basis of Example 1, the surface of the covering layer 142 has a sub-micron structure 17, and the surface of the sub-micron structure makes the surface of the covering layer 12 rough again, reduces surface reflection, and can improve the comfort during consumption and use. Although the flattened surface is scratch-resistant, since the roughness of the submicron structure 17 is much smaller than that of the semi-cylindrical lens array 141 , it is still scratch-resistant and not easily scratched by external force.

11: Pixel 12: glass sheet 13: Upper polarizer 14: Optical film 141: semi-cylindrical lens array 142: Overlay 15a: Right eye light 15b: Left eye light 16a: right eye 16b: left eye 17: Submicron structure r: radius of curvature

FIG. 1 is a schematic structural view of the stereoscopic display optical film of the present invention. FIG. 2 is a schematic structural view of an optical film for stereoscopic display in the prior art. Fig. 3 is a schematic diagram of the optical path when the stereoscopic display optical film of the present invention is used. FIG. 4 is a schematic diagram of the optical path of the stereoscopic display optical film in the prior art.

141: semi-cylindrical lens array

142: Overlay

17: Submicron structure

r: radius of curvature

Claims (5)

A stereoscopic display optical film for a display device, characterized in that it comprises a semi-cylindrical lens array and a transparent covering layer, the covering layer is located above the semi-cylindrical lens array and one side thereof is attached to the curved side of the semi-cylindrical lens array combine. The three-dimensional display optical film for a display device according to Claim 1, wherein the refractive index _n1 of the covering layer satisfies: _n1 < _n2 , where _n2 is the refractive index of the semi-cylindrical lens array The radius of curvature of a single lens in the semi-cylindrical lens array is r = (n ₂ -n ₁ )/F ₁ , where F ₁ is the refractive power of the semi-cylindrical lens array. The three-dimensional display optical film for a display device according to claim 1 or 2, wherein the plurality of lenses of the semi-cylindrical lens array are integrally formed. The three-dimensional display optical film for a display device according to claim 3, wherein the surface of the covering layer has a submicron structure. The three-dimensional display optical film for a display device according to claim 1 or 2, wherein the surface of the covering layer has a submicron structure.

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