TWI679474B - Anti-light leakage film assembly and display device using thereof - Google Patents

Abstract

A light leakage prevention film assembly includes a light diffusion layer and an anti-glare anti-reflection layer. One side of the anti-glare anti-reflection layer is in contact with the light diffusion layer, and the anti-glare anti-reflection layer is a rough surface with respect to the other side in contact with the light diffusion layer. The light incident from the bottom of the light diffusion layer is scattered around the light diffusion layer. After the scattered light enters the anti-glare anti-reflection layer, part of the light is refracted or reflected by the rough surface, which is measured by the outside of the anti-glare anti-reflection layer. It is measured that the haze outside the anti-glare anti-reflection layer is 50% to 85%. Thereby, the light leakage phenomenon of the horizontal viewing angle can be greatly improved without causing light interference ripple. At the same time, it can improve the anti-glare effect of the display, provide a clear visual experience, and have a better contrast effect in the dark state.

Description

Light leakage preventing film assembly and display using the light leakage preventing film assembly

The invention relates to the field of display, and in particular to a light-proof film assembly and a display using the light-proof film assembly.

As for the liquid crystal display, because it is designed through the backlight module, and the deflection of the liquid crystal is used to control the light flux. Therefore, it is difficult to avoid the phenomenon that light is exposed. However, this light leakage phenomenon will cause the contrast effect of the display to be poor, especially in dark areas.

For this, there are already settings for adjusting the transmission light diffusing film. However, the effect of the light diffusing film still cannot effectively suppress light leakage. If a multilayer light diffusing film is used, it is easy to generate interference moire due to the interference of light diffusing light rays.

In view of this, a light-proof film assembly is provided herein. The light leakage preventing film assembly includes a light diffusion layer and an anti-glare anti-reflection layer. The anti-glare anti-reflection layer is disposed on the light diffusion layer, and the anti-glare anti-reflection layer has a rough surface with respect to the side that contacts the light diffusion layer. The light incident from the bottom of the light diffusion layer is scattered toward the surroundings in the light diffusion layer. After the scattered light enters the anti-glare anti-reflection layer, part of the light is refracted or reflected by the rough surface, which is measured by the outside of the anti-glare anti-reflection layer. It is measured that the haze outside the anti-glare anti-reflection layer is 50% to 85%.

In some embodiments, the external haze measured by the exterior of the anti-glare anti-reflective layer It is 60% to 80%.

In some embodiments, the anti-glare anti-reflection layer has a refractive index of 1.4 to 1.6.

In some embodiments, the anti-glare anti-reflection layer includes an anti-glare portion and an anti-reflection portion. The anti-glare portion is disposed on the light diffusion layer, and the other side of the anti-glare portion with respect to the light diffusion layer is an uneven surface. The anti-reflection portion is disposed on the uneven surface, and the anti-reflection portion undulates along the uneven surface to form a rough surface.

Further, in some embodiments, the thickness of the anti-reflection portion is 50 to 140 nm.

Further, in some embodiments, the light scattered in the light diffusion layer enters the anti-glare part, part of the light is refracted or reflected by the uneven surface, and part of the light enters the anti-reflection part and is generated by the anti-reflection part. Refraction or reflection.

In some embodiments, the light diffusion layer includes a first diffusion portion and a second diffusion portion. The second diffusion portion is located between the first diffusion portion and the anti-glare anti-reflection layer. The first diffusion portion includes a plurality of first microstructures, and the second diffusion portion includes a plurality of second microstructures. The first microstructure and the second microstructure are periodically arranged, and the first microstructure corresponds to the second microstructure and is mutually adjacent. Group connection.

Further, in some embodiments, the refractive index of the second diffusion portion is greater than or equal to the refractive index of the first diffusion portion, and the refractive indices of the first diffusion portion and the second diffusion portion are 1.4 to 1.6.

Here, a display is also provided. The display includes a backlight module, a panel assembly, and an anti-leak film assembly. The backlight module generates light. The panel assembly includes a first polarizing film, a display panel, and a second polarizing film. The first polarizing film and the second polarizing film are respectively attached to opposite sides of the display panel. The first polarizing film is located above the backlight module, and directs the light generated by the backlight module to the display Panel, the second polarizing film will direct the light passing through the display panel to the viewing direction. The light leakage preventing film assembly includes a light diffusion layer and an anti-glare anti-reflection layer. The light diffusion layer is disposed on the second polarizing film, and the anti-glare anti-reflection layer is disposed on the light diffusion layer. One side of the anti-glare anti-reflection layer is in contact with the light diffusion layer, and the other side of the anti-glare anti-reflection layer is a rough surface with respect to the other side in contact with the light diffusion layer, and the light passing through the second polarizing film is incident into the light diffusion layer, and Scattered in the light diffusion layer towards the surroundings. After the scattered light enters the anti-glare anti-reflection layer, part of the light is refracted or reflected by the rough surface. Measured from the outside of the anti-glare anti-reflection layer, one of the anti-glare anti-reflection layers has an external haze of 50% to 85%. .

Here, an anti-glare anti-reflection layer and a light diffusion layer with an external haze of 50% to 85% are combined to form a light-proof film assembly. In a bright state, a dark area will not appear in a large viewing angle, and in a dark state, it can Significantly improve the light leakage phenomenon in the horizontal viewing angle, and it will not produce light interference ripple in the display area. At the same time, for users, the anti-glare effect and better contrast effect of the display can be improved to provide a clearer visual experience.

The detailed features and advantages of the present invention are described in detail in the following embodiments. The content is sufficient for any person skilled in the art to understand and implement the technical content of the present invention, and according to the content disclosed in this specification, the scope of patent applications and the drawings. Anyone skilled in the relevant art can easily understand the related objects and advantages of the present invention.

1‧‧‧Lightproof film assembly

10‧‧‧ light diffusion layer

11‧‧‧The first diffusion department

111‧‧‧ the first microstructure

13‧‧‧Second Diffusion Department

131‧‧‧Second microstructure

20‧‧‧Anti-glare anti-reflection layer

201‧‧‧first surface

203‧‧‧Second Surface

21‧‧‧Anti-glare section

211‧‧‧ uneven surface

23‧‧‧Anti-reflection

3‧‧‧ backlight module

4‧‧‧ panel assembly

41‧‧‧first polarizing film

43‧‧‧Second polarizing film

50‧‧‧ display panel

100‧‧‧ Display

L‧‧‧light

FIG. 1 is a schematic cross-sectional view of a light leakage preventing film assembly.

FIG. 2 is a detailed cross-sectional view of the light diffusion layer in FIG. 1.

FIG. 3 is a schematic cross-sectional view of a display.

FIG. 4A to FIG. 4C are comparison diagrams of light leakage tests in a dark state viewing angle according to different embodiments.

5A to 5C are comparison diagrams of a gamma curve test in different embodiments.

In the drawings, the widths of some elements, regions, etc. are exaggerated for clarity. Throughout the description, the same reference numerals denote the same elements. It will be understood that when an element such as is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present.

It should be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, components, regions, or sections, these elements, components, regions, and / or sections are not Should be limited by these terms. These terms are only used to distinguish one element, component, region, or section from another element, component, region, layer, or section. Thus, a "first element," "component," "region," or "portion" discussed below may be termed a second element, component, region, or portion without departing from the teachings herein.

In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element, as shown. It should be understood that relative terms are intended to include different orientations of the device in addition to the orientation shown in the figures. For example, if the device in one of the figures is turned over, elements described as being on the "lower" side of other elements would then be oriented on "upper" sides of the other elements. Thus, the exemplary term "down" may include orientations of "down" and "up", depending on the particular orientation of the drawings. Similarly, if the device in one of the figures is turned over, elements described as "below" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "below" or "below" may include above and below Party orientation.

FIG. 1 is a schematic cross-sectional view of a light leakage preventing film assembly. As shown in FIG. 1, the light leakage prevention film assembly 1 includes a light diffusion layer 10 and an anti-glare anti-reflection layer 20. The first surface 201 of the anti-glare anti-reflection layer 20 contacts the light diffusion layer 10, and the anti-glare anti-reflection layer 20 is a rough surface with respect to the second surface 203 of the light diffusion layer 10. The light L incident from the bottom of the light diffusion layer 10 is scattered around the light diffusion layer 10, and after the scattered light L enters the anti-glare anti-reflection layer 20, part of the light L is refracted by the rough surface of the second surface 203 or reflection. Therefore, as measured from the outside of the anti-glare anti-reflection layer 20, the haze outside the anti-glare anti-reflection layer 20 is 50% to 85%.

In the art, haze refers to the percentage of the total transmitted light intensity that is more than 2.5 ° away from the incident light. The larger the haze, the lower the gloss and transparency of the film, especially the lower the degree of imaging. In other words, the haze is measured by a beam of parallel light from a standard "c" light source, which is perpendicularly irradiated onto transparent or translucent films, sheets, and plates. Due to the scattering caused by the interior and surface of the material, part of the parallel light deviates from the incident direction by more than The percentage of the ratio of the scattered light flux at 2.5 ° to the light flux through the material is an important parameter for the optical transparency of transparent or translucent materials. The external haze referred to in this case refers to a haze value measured from the outside of the anti-glare anti-reflection layer 20. In other words, the haze value obtained by directly measuring the surface of the anti-glare anti-reflection layer 20 of the light leakage prevention film assembly 1 with an optical instrument.

Referring again to FIG. 1, the anti-glare anti-reflection layer 20 includes an anti-glare portion 21 and an anti-reflection portion 23. The anti-glare portion 21 is disposed on the light diffusion layer 10. One surface 201, and the other side of the anti-glare portion 21 with respect to the light diffusion layer 10 is an uneven surface 211, which has an uneven topography. The anti-reflection portion 23 is disposed on the uneven surface 211, and the anti-reflection portion 23 is undulated along the uneven surface 211 to form a rough surface Second surface 203.

Here, the thickness of the anti-reflection portion 23 is 50 to 140 nm. Therefore, at this thickness, the anti-reflection portion 23 undulates substantially along the uneven surface 211. However, this is only a preferred embodiment and is not limited to this in practice. The anti-glare anti-reflection layer 20 can be adjusted to a desired external haze by adjusting the uneven topography of the uneven surface 211 or adjusting the material and thickness of the anti-reflection portion 23. In more detail, the outer haze is preferably 55% to 80%.

In more detail, the light scattered in the light diffusion layer 10 enters the anti-glare portion 21, and part of the light L is refracted or reflected by the uneven surface 211, and part of the light L enters the anti-reflective portion 23 through the anti-glare portion 21 , When the anti-reflection portion 23 generates refraction or reflection, or when it reaches the second surface 203 having a rough surface, refraction or reflection occurs. In this way, the light leakage phenomenon of the horizontal viewing angle can be improved, and when used in the dark state of the display, it can provide a better contrast effect. In other words, the dark parts will appear closer to black.

FIG. 2 is a detailed cross-sectional view of the light diffusion layer 10 in FIG. 1. As shown in FIG. 2, the light diffusion layer 10 includes a first diffusion portion 11 and a second diffusion portion 13. The second diffusion portion 13 is located between the first diffusion portion 11 and the anti-glare anti-reflection layer 20. The first diffusion portion 11 includes a plurality of first microstructures 111, and the second diffusion portion 13 includes a plurality of second microstructures 131. The first microstructure 111 and the second microstructure 113 are arranged periodically, and the first microstructure 111 corresponds to the second microstructure 131 and is assembled with each other. Here, the first microstructure 111 corresponds to the second microstructure 131 by using bumps, and the first microstructure 111 is clamped between two bumps of the second microstructure 131. But this is only an example, and it is not limited to this.

The refractive index of the second diffusion portion 13 is greater than or equal to the refractive index of the first diffusion portion 11, and the refractive indices of the first diffusion portion 11 and the second diffusion portion 13 are 1.4 to 1.6. In addition, anti-glare The refractive index of the anti-reflection layer 20 is 1.4 to 1.6. Preferably, the design of the refractive index is gradually increased from the light diffusion layer 10 to the anti-glare anti-reflection layer 20. In other words, the refractive index can be determined by the first diffusion portion 11 and the second The diffusion portion 13, the anti-glare portion 21 to the anti-reflection portion 23 are gradually increased, but this is only an example, and is not limited to this in reality.

FIG. 3 is a schematic cross-sectional view of a display. As shown in FIG. 3, the display 100 includes a backlight module 3, a panel assembly 4, and a light leakage preventing film assembly 1. The backlight module 3 generates light L. The panel assembly 4 includes a first polarizing film 41, a display panel 50, and a second polarizing film 43. The first polarizing film 41 and the second polarizing film 43 are respectively attached to opposite sides of the display panel 50. The first polarizing film 41 is located above the backlight module 3 and directs the light generated by the backlight module 3 to the display panel 50. The second polarizing film 43 directs the light passing through the display panel 50 to the viewing direction. The light leakage prevention film assembly 1 includes a light diffusion layer 10 and an anti-glare anti-reflection layer 20. The light diffusion layer 10 is disposed on the second polarizing film 43, and the anti-glare anti-reflection layer 20 is disposed on the light diffusion layer 10. The first surface 201 of the anti-glare anti-reflection layer 20 contacts the light diffusion layer 10, and the anti-glare anti-reflection layer 20 is a rough surface with respect to the second surface 203 that contacts the light diffusion layer 10, and the light L passing through the second polarizing film 43 is emitted It enters the light diffusion layer 10 and scatters in the light diffusion layer 10 toward the surroundings. After the scattered light L enters the anti-glare anti-reflection layer 20, part of the light is refracted or reflected by the rough surface of the second surface 203, measured by the outside of the anti-glare anti-reflection layer 20, and the fog outside the anti-glare anti-reflection layer 20 The degree is 50% to 85%.

FIG. 4A to FIG. 4C are comparison diagrams of light leakage test in dark state viewing angle according to different embodiments, where FIG. 4A is for viewing angle Φ (PHI) = 0 degrees (horizontal viewing angle), and FIG. 4B is for viewing angle Φ (PHI) = 45 degrees, FIG. 4C is a test curve of the scanning angle (θ) -light intensity regression value for the viewing angle Φ (PHI) = 90 (vertical angle of view). Here, the scanning angle of view is selected from -80 degrees to 80 degrees. In FIGS. 4A to 4C, the bottom to the top of the figure are sequentially represented by thin solid lines. It is a test curve of the display with the light leakage film assembly of the first embodiment attached; the thin dashed line indicates the test curve of the display with the light leakage film assembly of the second embodiment attached; Test curve of the display with the light leak-proof film assembly of Comparative Example 1 attached; a short chain line indicates the test curve of the display with the light leak-proof film assembly of Comparative Example 2 attached; the two-dot chain line indicates the sticker Test curve of the display with the light leak-proof film assembly of Comparative Example 3; the bold curve indicates the test curve of the display with the light leak-proof film assembly of Comparative Example 4 attached; Test curve of display with light leakage film assembly.

Here, the light leakage preventing film assembly of the first embodiment is composed of a light diffusion layer and an anti-glare and anti-reflection layer with an external haze of 70%. The light leakage preventing film assembly of the second embodiment is composed of a light diffusion layer and an anti-glare and anti-reflection layer with an external haze of 55%. The light leakage preventing film assembly of Comparative Example 1 is composed of a light diffusion layer and an anti-glare anti-reflection layer with an outer haze of 40%. The light leakage prevention film assembly of Comparative Example 2 is composed of two light diffusion layers. The light leakage prevention film assembly of Comparative Example 3 has only a light diffusion layer; the light leakage prevention film assembly of Comparative Example 4 has only an anti-glare anti-reflection layer having an external haze of 70%.

As shown in FIG. 4A to FIG. 4C, it can be clearly understood that, in the light leakage test in the dark state viewing angle, the scanning viewing angle corresponds to the intensity of light leakage. The display of the light leakage prevention film assembly of the embodiment is low, indicating that the degree of light leakage is less, and the display without the light leakage prevention film assembly attached is the highest, which indicates that the light leakage is more serious.

FIG. 5A to FIG. 5C are comparison diagrams of a Gamma curve test according to different embodiments. FIG. 5A is a comparison chart of the grayscale value-intensity regression value of the viewing angle Φ (PHI) = 0 degrees and the scanning viewing angle θ = 30 degrees. FIG. 5B is a comparison diagram of the grayscale value-intensity regression value of the viewing angle Φ (PHI) = 0 degrees and the scanning viewing angle θ = 60 degrees. FIG. 5C is a comparison diagram of the grayscale value-intensity regression value of the viewing angle Φ (PHI) = 0 degrees and the scanning viewing angle θ = 45 degrees. In FIGS. 5A to 5C, the dotted line indicates the positive viewing angle (Gamma 2.2). Ideal value; the solid line indicates the gamma test curve of the display attached with the light leak-proof film assembly (light diffusion film and anti-glare anti-reflection layer with an external haze of 70%) of Example 1; the short chain line is attached The gamma test curve of the display of the light leak-proof film assembly (with only one layer of light diffusion film attached) of Comparative Example 3; and the one-dot chain line indicates the gamma test curve of the display without the light leak-proof film assembly attached.

As shown in FIGS. 5A to 5C, the deviation between the gamma curve and the ideal curve of the display without the light leakage film assembly is large. The gamma test curve of the display with the light leakage prevention film assembly (light diffusion film and anti-glare anti-reflection layer with an external haze of 70%) attached in Example 1 and the light leakage prevention film assembly of Comparative Example 3 attached ( The Gamma test curves of displays with only one layer of light diffusion film attached are closer to the ideal curve.

In addition, the experimental results of these other examples are shown in Table 1 below. In this way, the influence of the external haze of the light diffusion layer 10 and the anti-glare anti-reflection layer 20 on the related effects can be seen.

Here, the anti-glare anti-reflection layer 20 and the light diffusion layer 10 with an external haze of 50% to 85% are combined to form a light-proof film assembly 1, which will not show a dark area at a large viewing angle in the bright state, but a dark state At this time, the light leakage phenomenon of the horizontal viewing angle can be greatly improved, and the light interference ripple of the display area is not generated. At the same time, for the user, the anti-glare effect and the contrast effect of the display 100 can be improved, and a clearer visual experience can be provided.

Although the technical content of the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art and making some changes and retouching without departing from the spirit of the present invention should be covered by the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended patent application.

Claims (11)

An anti-leak film assembly includes: a light diffusion layer; and an anti-glare anti-reflection layer, including an anti-glare portion and an anti-reflection portion, the anti-glare portion is disposed on the light diffusion layer, and the anti-glare portion The other side opposite to the light diffusing layer is an uneven surface, the anti-reflection portion is disposed on the uneven surface of the anti-glare portion, and the anti-reflection portion undulates along the uneven surface to form a rough surface ; Wherein the refractive index from the light diffusion layer, the anti-glare part, to the anti-reflection part is gradually increased, and the light incident from the bottom of the light diffusion layer is scattered around the light diffusion layer, and the scattered light After the light enters the anti-glare anti-reflection layer, a part of the light is refracted or reflected by the rough surface. One of the light leakage prevention film assemblies measured from the anti-glare anti-reflection layer has an external haze of 50% to 85. %. The light leakage preventing film assembly according to claim 1, wherein the external haze is 55% to 80%. The light leak-proof film assembly according to claim 1, wherein the light scattered in the light diffusing layer enters the anti-glare part, part of the light is refracted or reflected by the uneven surface, and part of the light enters The anti-reflection portion is refracted or reflected by the anti-reflection portion. The light leakage preventing film assembly according to claim 3, wherein a thickness of the anti-reflection portion is 50 to 140 nm. The light leakage preventing film assembly according to claim 1, wherein the light diffusion layer includes a first diffusion portion and a second diffusion portion, and the second diffusion portion is located between the first diffusion portion and the anti-glare anti-reflection layer. Meanwhile, the first diffusion portion includes a plurality of first microstructures, the second diffusion portion includes a plurality of second microstructures, the first microstructures and the second microstructures are periodically arranged, and the The first microstructures are connected to each other corresponding to the second microstructures, and the refractive index of the first diffusion portion is smaller than the refractive index of the second diffusion portion. The light leakage preventing film assembly according to claim 5, wherein the refractive indices of the first diffusion portion and the second diffusion portion are 1.4 to 1.6. The light leakage preventing film assembly according to claim 1, wherein the refractive index of the anti-glare anti-reflection layer is 1.4 to 1.6. A display includes: a backlight module that generates light; a panel assembly including a first polarizing film, a display panel, and a second polarizing film, wherein the first polarizing film and the second polarizing film are respectively attached Attached to opposite sides of the display panel, the first polarizing film is located above the backlight module, the light generated by the backlight module is guided to the display panel, and the second polarizing film is guided through the light of the display panel A viewing angle direction; and an anti-light leakage film assembly including a light diffusion layer and an anti-glare anti-reflection layer, the light diffusion layer is disposed on the second polarizing film, and the anti-glare anti-reflection layer includes an anti-glare portion and An anti-reflective portion is disposed on the light diffusion layer, and the other side of the anti-glare portion with respect to the light diffusion layer is an uneven surface, and the anti-reflective portion is disposed on the anti-glare portion. On the uneven surface, and the anti-reflection portion undulates along the uneven surface to form a rough surface, wherein the refractive index from the light diffusion layer, the anti-glare portion, to the anti-reflection portion gradually increases, Through this The light from the two polarizing films enters the light diffusion layer, is scattered toward the surroundings in the light diffusion layer, and after the scattered light enters the anti-glare anti-reflection layer, part of the light is refracted or reflected by the rough surface. An external haze of the light leakage preventing film assembly measured by the anti-glare anti-reflection layer is 50% to 85%. The display according to claim 8, wherein the external haze is 60% to 80%. The display according to claim 8, wherein the light scattered by the light diffusion layer enters the anti-glare part, part of the light is refracted or reflected by the uneven surface, and part of the light enters the anti-reflective part, Refraction or reflection occurs through the anti-reflection portion. The display according to claim 8, wherein the light diffusion layer includes a first diffusion portion and a second diffusion portion, and the second diffusion portion is located between the first diffusion portion and the anti-glare anti-reflection layer. A diffusion portion includes a plurality of first microstructures, the second diffusion portion includes a plurality of second microstructures, the first microstructures and the second microstructures are arranged in a periodic arrangement, and the first microstructures Corresponding to the second microstructures, the refractive index of the first diffusion portion is smaller than that of the second diffusion portion.