CN106873054A - Anti-reflection optical film - Google Patents

Abstract

The invention provides an optical film. The optical film includes a base film, a rough layer and an anti-reflective layer. The rough layer is disposed on the base film and has a rough surface; the anti-reflective layer is disposed on the rough surface. The section of the rough surface in the preset direction has a section curve. The reference baseline can be derived from the cross-section curve. Relative to the reference baseline, some parts of the cross-sectional curve will be lower than the reference baseline and form valleys. The ratio of the maximum depth to the maximum width of some of the valleys is not greater than 0.26.

Description

Anti-reflection optical film

technical field

The present invention relates to an optical film; specifically, the present invention relates to an anti-reflection optical film used in a display module.

Background technique

Flat and curved display devices have been widely used in various electronic devices, such as mobile phones, personal wearable devices, televisions, vehicle hosts, personal computers, digital cameras, handheld video games, and so on. However, in order to improve the user's visual experience, the industry is still constantly improving the optical performance of the display device.

For example, the display surface of some display devices may generate glare due to external ambient light during use. In most usage situations, glare often causes visual discomfort to some users and affects the optical performance of displayed images. In order to solve this problem, some conventional display devices are provided with a high-haze layer with a rough surface on the display surface to reduce glare. However, when the haze is high, users tend to feel the unclearness of white fog on the display surface due to the setting of the high haze layer.

In order to reduce the above-mentioned unclear feeling of white fog, some existing display devices will coat the outer surface of the above-mentioned high-haze layer with an anti-reflection layer. However, the anti-reflection layer often has uneven thickness, which affects the surface roughness of the high-haze layer, thereby affecting the overall optical performance.

Contents of the invention

The object of the present invention is to provide an optical film, which can improve the distribution uniformity of the anti-reflection layer disposed on the rough layer.

Another object of the present invention is to provide an optical film that can maintain relatively close roughness after an anti-reflection layer is disposed on the rough layer.

Another object of the present invention is to provide an optical film, which can alleviate the phenomenon of increased reflectance caused by the difference in roughness after the anti-reflection layer is disposed on the rough layer.

Another object of the present invention is to provide a display module capable of reducing glare and optical effects of reflectivity.

To achieve the above object, the present invention provides an optical film, comprising:

a basement membrane having a bearing surface;

A rough layer is arranged on the bearing surface; wherein, the rough layer has a rough surface opposite to the bearing surface; the rough surface has a section curve on a section in a predetermined direction; a section curve is obtained from the section curve With reference to a baseline, the portion of the cross-sectional curve below the reference baseline forms a majority of valleys, at least some of which have a maximum depth-to-maximum width ratio of not greater than 0.26; and

an anti-reflection layer disposed on the rough surface;

Wherein, the reference baseline is the 75% elevation line of the section curve.

Wherein, each of the valleys has a valley bottom position, at least part of the valley bottom position has a curvature radius not less than 1.4 μm.

The distance between the reference baseline and the average peak elevation of the section curve is less than 1 μm.

Wherein, the rough surface defines a reference datum plane at 75% elevation; the part of the rough surface lower than the reference datum plane has a first projected area on the reference datum plane, and the rough surface is higher than the reference datum plane. The part of the datum plane has a second projected area on the reference datum plane, and the ratio of the first projected area to the second projected area is between 16% and 78.5%.

Wherein, the part of the cross-sectional curve higher than the reference baseline forms a majority of peaks, and the proportion of the valleys protruding relative to the rough surface is smaller than that of the peaks protruding relative to the rough surface or accounted for the proportion of these peaks.

Wherein, the haze of the anti-reflection layer laminated on the rough layer is greater than 65%.

Moreover, in order to achieve the above object, the present invention provides an optical film, comprising:

a basement membrane having a bearing surface;

A rough layer is arranged on the bearing surface; wherein, the rough layer has a rough surface opposite to the bearing surface; the rough surface has a rough curve on a section in a predetermined direction; a rough curve is obtained from the rough curve an average line, the portion of the roughness curve below which forms a majority of valleys, at least some of which have a ratio of maximum depth to maximum width of not greater than 0.26; and

An anti-reflection layer is arranged on the rough surface.

Wherein, each of the valleys has a valley bottom position, at least part of the valley bottom position has a curvature radius not less than 1.4 μm.

Wherein, the rough surface defines a reference datum plane at 75% elevation; the part of the rough surface lower than the reference datum plane has a first projected area on the reference datum plane, and the rough surface is higher than the reference datum plane. The part of the datum plane has a second projected area on the reference datum plane, and the ratio of the first projected area to the second projected area is between 16% and 78.5%.

Wherein, the portion of the roughness curve higher than the average line forms a majority of peaks, and the proportion of the valleys protruding relative to the rough surface is smaller than that of the peaks protruding relative to the rough surface or accounted for the proportion of these peaks.

The display module includes an optical film and a display panel. The display panel has a display surface, and the optical film is arranged on the display surface. The optical film includes a base film, a rough layer and an anti-reflection layer. The base film has a carrying surface, and the carrying surface is opposite to the side facing the display surface on the base film. The rough layer is arranged on the bearing surface and has a rough surface opposite to the bearing surface. The anti-reflection layer is distributed on the rough surface.

The section of the rough surface in the predetermined direction has a section curve. A virtual reference baseline can be drawn from the section curve. For example, the reference baseline may be the 75% elevation line of the section curve. Relative to the reference baseline, some of the section curves will be lower than the reference baseline and form valleys, and some will be higher than the reference baseline and form peaks; the ratio of the maximum depth to the maximum width of some valleys is not greater than 0.26. Therefore, the difference between the overall roughness of the optical film after the anti-reflection layer is provided and the roughness of the rough surface itself will be smaller, thereby reducing the increase in reflectivity.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of a display module of the present invention;

Fig. 2 is an exploded view of an embodiment assembly of the optical film of the present invention;

Fig. 3 is a schematic cross-sectional view of the embodiment shown in Fig. 2;

Fig. 4 is the enlarged schematic diagram of the embodiment of section curve;

Fig. 5 is the embodiment schematic diagram of section curve;

Figure 6 is a schematic diagram of an embodiment of a rough layer;

Fig. 7 is a schematic diagram of an embodiment of obtaining a rough curve from a cross-sectional curve.

Among them, reference signs:

10 Optical film

30 display panel

31 display surface

100 basement membrane

110 bearing surface

200 preset orientations

210 section

300 rough layers

310 rough surface

311 Concave

313 Convex

330 rough structure

350 Section Curve

351 Tanibe

352 valley position

353 Peak

370 reference baseline

380 reference plane

500 anti-reflection layer

700 rough curves

710 average

detailed description

The invention provides an optical film and a display module using the optical film. The display module can preferably be applied to various displays, such as computer monitors, televisions, monitors, car hosts, and the like. In addition, the display module can also be applied to display modules contained in other electronic devices, such as display screens of mobile phones, digital cameras, and handheld game devices.

As shown in FIG. 1 , the display module includes an optical film 10 and a display panel 30 . The display panel 30 has a display surface 31 , and the optical film 10 is disposed on the display surface 31 . In a preferred embodiment, the optical film 10 has the optical effect of polarized light; in addition, the optical film 10 also has the effect of reducing glare. The display panel 30 is preferably a liquid crystal display panel, and can cooperate with a backlight module (not shown) to display images. However, in different embodiments, the display panel 30 can also be a self-illuminating display panel, such as an organic light emitting diode panel, or other similar display panels such as an electrophoretic display panel.

In the embodiment shown in FIG. 2 and FIG. 3 , the optical film includes a base film 100 , a rough layer 300 and an anti-reflection layer 500 . The base film 100 has a carrying surface 110 , and the carrying surface 110 is opposite to a side of the base film 100 facing the display surface 31 . The base film 100 is preferably a polarizer; however, in different embodiments, the base film 100 can also be a film with other optical effects, or a transparent film without special optical effects.

As shown in FIGS. 2 and 3 , the rough layer 300 is disposed on the carrying surface 110 and has a rough surface 310 opposite to the carrying surface 110 . The rough layer 300 includes rough structures 330 distributed on the carrying surface 110 , wherein the rough structures 330 are formed with a plurality of protrusions and pits therebetween; and the surface of the rough structures 330 is the rough surface 310 . The material of the rough layer 300 is preferably a resin material, and is preferably made by a phase inversion method, such as a heat-induced phase separation method, a steam-induced phase separation method, a dry method, and a wet method. The anti-reflection layer 500 is disposed on the rough surface 310; in a preferred embodiment, the anti-reflection layer 500 may be made of metal oxide or other compound materials. The anti-reflection layer 500 can be formed on the rough surface 310 by various coating processes, coating or other processes.

As shown in FIGS. 2 and 3 , the cross section 210 of the rough surface 310 in a predetermined direction 200 has a cross section curve 350 . The predetermined direction 200 is preferably a direction parallel to the carrying surface 110 ; in other words, the predetermined direction 200 falls on the X-Y plane shown in FIG. The section 210 on the preset direction 200 is preferably perpendicular to the bearing surface 110; Section 210 is obtained. The intersection of the section 210 and the rough surface 310 is the section curve 350 . However, when it is desired to measure the cross-section curve 350 in practice, it is not necessary to actually cut the rough layer 300 , and only need to detect along the default direction 200 with a relevant instrument to obtain the cross-section curve 350 on the cross-section 210 .

As shown in FIGS. 3 and 4 , a virtual reference baseline 370 can be obtained from the section curve 350 . In a preferred embodiment, the reference baseline 370 is the 75% elevation line of the section curve 350 (100% being the highest elevation). For example, if the junction of the load-bearing surface 110 and the section 210 is used as the reference line whose elevation is 0, each point on the section curve 350 can obtain a relative elevation respectively; and the quartile height of the upper) as the height of the reference baseline 370. With respect to the reference base line 370 , part of the section curve 350 is lower than the reference base line 370 to form a valley 351 , and part is higher than the reference base line 370 to form a peak 353 . The ratio of the maximum depth D to the maximum width W of the partial valley 351 is preferably not greater than 0.26. Preferably, the average ratio of the maximum depth D to the maximum width W of each valley 351 is no greater than 0.26. More preferably, the ratio of the maximum depth D to the maximum width W of each valley 351 is not greater than 0.26. By controlling the aspect ratio of at least part of the valley portion 351 , the thickness of the anti-reflection layer 500 disposed on the bottom of the valley portion 351 can be made more uniform, and the undulations of the outer surface of the anti-reflection layer 500 can be more closely matched with the undulations of the rough surface 310 . Thus, the difference between the overall roughness of the optical film after the anti-reflection layer 500 is provided and the roughness of the rough surface 310 itself will be smaller, thereby reducing the increase in reflectivity.

In addition, in this preferred embodiment, as shown in FIG. 4 , the valley portions 351 each have a valley portion 352 ; at least part of the valley portion 352 has a curvature radius R of not less than 1.4 μm. With this design, the curved surface of the valley bottom portion 352 is gentler rather than too sharp, so the anti-reflection layer 500 can be more evenly distributed on the valley bottom portion 352 without abnormal thickness increase. Thus, the roughness of the rough surface 310 can be maintained, thereby reducing the increase in reflectivity.

As shown in FIG. 5 , the section curve 350 has a plurality of peaks 353 respectively located above the reference base line 370 . The average peak height P (relative to the bearing surface 110 ) can be obtained by averaging the peak top elevations of the peaks 353 . In this preferred embodiment, the distance d between the average peak height P and the reference baseline 370 is less than 1 μm; and preferably, the average peak height P is higher than the reference baseline 370 . With this design, the overall height difference on the rough surface 310 will not be too large, and it is easier to control the uniformity of the anti-reflection layer 500 disposed on the rough surface 310 .

In addition, as shown in FIG. 4 and FIG. 5 , as far as the valleys 351 distributed on the cross-sectional curve 350 are concerned, each valley 351 will include a protruding part and a concave part relative to the rough surface 310, The ratio of the protruding portion of each valley 351 to the total length of the curve of each valley 351 is defined as the first ratio. In addition, in terms of the peaks 353, each peak 353 will include a protruding part and a concave part relative to the rough surface 310, wherein the protruding part of each peak 353 accounts for the total length of the curve of each peak 353 The ratio of is defined as the second ratio. In this preferred embodiment, the first ratio is smaller than the second ratio; in other words, the concave curve in the valley portion 351 has a larger proportion. This will reduce the possibility of narrow gaps when two protruding curves meet in the valley 351 , thereby reducing the thickness of the anti-reflection layer 500 due to accumulation in the narrow gaps.

As shown in Figure 6, the rough surface 310 can define a virtual reference datum plane 380 at 75% elevation; The height of an elevation height; after performing statistical analysis on these elevation heights, the third (from bottom to top) quartile height is taken as the elevation of the reference datum surface 380. A portion of the rough surface 310 is higher than the reference plane 380 to form a convex portion 313 , while a portion is lower than the reference plane 380 to form a concave portion 311 . The concave portion 311 has a first projected area on the reference plane 380 , and the convex portion 313 has a second projected area on the reference plane 380 . In a preferred embodiment, the haze of the anti-reflection layer 500 laminated on the rough layer 300 needs to be greater than 65%, and the ratio of the first projected area to the second projected area is preferably between 16% and 78.5%. Under the requirement of high haze, it can still maintain a certain display clarity.

In a preferred embodiment, the roughness of the rough surface 310 within the reference length L in the predetermined direction 200 is between 0.25 μm and 1 μm. More preferably, the roughness is about 0.5 μm. As shown in FIG. 7 , the roughness here is preferably the centerline average roughness (Ra); in other words, the roughness curve 700 is obtained by processing the section curve such as filtering out the influence of the slope. An average line 710 such as a center line is defined on the rough curve 700 . Then, the absolute value of the elevation of the roughness curve 700 within the reference length L relative to the mean line 710 is integrated and averaged (that is, divided by the reference length L) to obtain the centerline average roughness. As shown in the simulation results in the table below, when other design factors are the same, the original roughness of the rough surface 310 of model 2 is about 0.5 μm, and the overall roughness after adding the anti-reflection layer will be the least different from the original roughness ( 0.02μm); relatively speaking, the lowest overall reflectance (0.99%) can also be obtained.

With this design, the roughness of the rough surface 310 is less affected after the anti-reflection layer 500 is disposed. In addition, in different embodiments, the above-mentioned roughness curve 700 and average line 710 can also be used to define a plurality of valleys 351, which can be designed with reference to the aspect ratio recommendations in the above-mentioned embodiments, so as to maintain the roughness and The purpose of mitigating the increase in reflectivity.

Certainly, the present invention also can have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the protection scope of the claims of the present invention.

Claims (10)

1. a kind of blooming piece, it is characterised in that include：

One basilar memebrane, with a loading end；

One rough layer, is arranged on the loading end；Wherein, the rough layer has a mat surface opposite with the loading end；This is coarse Face on the section on a preset direction have a cross section curve；One reference baseline is drawn by the cross section curve, the cross section curve Most valley are formed less than the part of the reference baseline, the depth capacity of at least part of valley is little with the ratio of Breadth Maximum In 0.26；And

One anti-reflecting layer, is arranged on the mat surface；

Wherein, the reference baseline system is 75% altitude traverse of the cross section curve.

2. blooming piece according to claim 1, it is characterised in that those valley have a lowest point position respectively, at least Partly the radius of curvature at the lowest point position is not less than 1.4 μm.

3. blooming piece according to claim 1, it is characterised in that the average crest height of wave of reference baseline and the cross section curve Journey distance is less than 1 μm.

4. blooming piece according to claim 1, it is characterised in that the mat surface lies in and a reference is defined at 75% elevation Datum level；Less than the part of the reference datum in having one first projected area on the reference datum on the mat surface, should On mat surface higher than the reference datum part on the reference datum have one second projected area, first perspective plane The ratio of product and second projected area is between 16% to 78.5%.

5. blooming piece according to claim 1, it is characterised in that part shape of the cross section curve higher than the reference baseline Into most valleys, it is somebody's turn to do in the ratio that evagination person accounts for those valley is relative less than in those valleys with respect to the mat surface in those valley Mat surface accounts for the ratio of those valleys in evagination person.

6. blooming piece according to claim 1, it is characterised in that the anti-reflecting layer coincides in the mist degree after the rough layer More than 65%.

7. a kind of blooming piece, it is characterised in that include：

One basilar memebrane, with a loading end；

One rough layer, is arranged on the loading end；Wherein, the rough layer has a mat surface opposite with the loading end；This is coarse Face on the section on a preset direction have a coarse curve；One average line is drawn by the coarse curve, the coarse curve is low Most valley are formed in the part of the average line, at least part of depth capacity of the valley is not more than with the ratio of Breadth Maximum 0.26；And

One anti-reflecting layer, is arranged on the mat surface.

8. blooming piece according to claim 7, it is characterised in that those valley have a lowest point position respectively, at least Partly the radius of curvature at the lowest point position is not less than 1.4 μm.

9. blooming piece according to claim 7, it is characterised in that the mat surface lies in and a reference is defined at 75% elevation Datum level；Less than the part of the reference datum in having one first projected area on the reference datum on the mat surface, should On mat surface higher than the reference datum part on the reference datum have one second projected area, first perspective plane The ratio of product and second projected area is between 16% to 78.5%.

10. blooming piece according to claim 7, it is characterised in that part shape of the coarse curve higher than the average line Into most valleys, it is somebody's turn to do in the ratio that evagination person accounts for those valley is relative less than in those valleys with respect to the mat surface in those valley Mat surface accounts for the ratio of those valleys in evagination person.