CN217467233U - Multi-angle peep-proof sheet and polarizing plate - Google Patents

Abstract

The utility model provides a multi-angle peep-proof piece is applicable to the display module, contains half-wave plate, polaroid, and presss from both sides and locates half-wave plate with high phase difference piece between the polaroid, and just the thickness phase difference value (R) of high phase difference piece _th ) Between-500 and-1800 nm. A phase value (R) passing through the high phase difference plate _th ) And controlling, and respectively arranging a half-wave plate and a polarizer on two opposite surfaces of the high phase difference plate, so that the aim of multi-angle peep prevention can be fulfilled by utilizing polarized light steering. Furthermore, the utility model also provides a polarizing plate that has the multi-angle peep-proof piece.

Description

Multi-angle peep-proof sheet and polarizing plate

Technical Field

The utility model relates to a peep-proof piece and polarizing plate especially relate to a multi-angle peep-proof piece that can multi-angle peep-proof, and contain the polaroid of multi-angle peep-proof piece.

Background

To avoid the use of 3C products in public applications, for example: the notebook computer or the mobile phone is peeped by surrounding people when information is transmitted, so that the visual angle of the 3C product can be limited by additionally arranging the peep-proof component, a user can only watch the screen in the forward direction, people except the visual angle are prevented from watching the screen, and the purpose of peep prevention is achieved to keep the privacy of the user.

At present, a conventional peep-proof assembly is provided with a peep-proof patch directly attached to the surface of a display, and the peep-proof patch mainly utilizes the principle of a shutter to limit emergent rays of the display to pass through only within a certain range of visual angles (such as a positive visual angle +/-30 degrees), and rays outside the range of the visual angles cannot pass through so as to generate a peep-proof effect.

Although the foregoing anti-peeping assemblies can achieve the anti-peeping effect, they can only peep at an angle in a single direction, for example, at the left and right sides of the forward viewing angle of the user, but cannot have the anti-peeping effect at the upper and lower viewing angles with the viewing angle of the user at the same time.

Disclosure of Invention

An object of the utility model is to provide a but multi-angle peep-proof piece that is used for the display module surface, multi-angle peep-proof.

The utility model discloses a multi-angle peep-proof piece contains half-wave plate, polaroid, and presss from both sides and locates half-wave plate with high phase difference piece between the polaroid.

Wherein, the thickness phase difference value of the high phase difference plate at the wavelength of 550nm is between-500 nm and-1800 nm.

Preferably, the multi-angle anti-peeping sheet of the present invention, wherein the thickness phase difference value of the high phase difference plate at the wavelength of 550nm is between-600 nm and-900 nm.

Preferably, the multi-angle anti-peeping sheet of the present invention, wherein the thickness phase difference value of the high phase difference plate at the wavelength of 550nm is between-750 nm and-900 nm.

Preferably, the utility model discloses a multi-angle peep-proof piece, wherein, half wave plate's in-plane phase difference value is between 215 ~ 300 nm.

Preferably, the utility model discloses a multi-angle peep-proof piece, wherein, high phase difference piece is positive C template compensation film.

Preferably, the multi-angle privacy mask of the present invention, wherein nz > nx ═ ny of the high phase difference plate, wherein nx, ny, nz are refractive indexes of the high phase difference plate in the direction of the X, Y, Z axes.

Preferably, the utility model discloses a multi-angle peep-proof piece, wherein, the thickness phase difference value of half-wave plate is between 95 ~ 180 nm.

Preferably, the utility model discloses a multi-angle peep-proof piece, wherein, work as the multi-angle peep-proof piece with display module combines and when the light state, the central luminance of multi-angle peep-proof piece is not less than 90% of display module luminance.

Preferably, the utility model discloses a multi-angle peep-proof piece, wherein, the light absorption axle of the polaroid of multi-angle peep-proof piece with the contained angle of the light absorption axle of the last polaroid of display module is 45.

In addition, another objective of the present invention is to provide a polarizing plate for a display device, which is capable of preventing peeping at multiple angles.

The utility model discloses a polarizing plate contains the polaroid, and multi-angle peep-proof unit.

The multi-angle peep-proof unit comprises a half-wave plate, a polaroid and a high phase difference plate clamped between the half-wave plate and the polaroid.

The half-wave plate is clamped between the upper polarizer and the high phase difference plate, and the thickness phase difference value of the high phase difference plate at the wavelength of 550nm is between-500 nm and-1800 nm.

The beneficial effects of the utility model reside in that: the thickness phase value of the high phase difference plate is between-500 nm and-1800 nm, and the half-wave plate and the polaroid are respectively arranged on the two opposite surfaces of the high phase difference plate, so that the aim of multi-angle peep prevention can be achieved by utilizing the polarization light direction change.

Drawings

Other features and effects of the present invention will be apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram illustrating an embodiment of a multi-angle privacy sheet of the present invention;

FIG. 2 is a spectrum chart of a front-view bright-state white frame of the spectrum measurement results of the front-view bright-state white frames of comparative examples 1, 2 and 3 and the comparative example;

FIG. 3 is a front bright white frame spectrum chart showing the measurement results of the front bright white frame spectra according to the embodiments 1, 2, and 3 of the present invention and the comparative example;

fig. 4 is a front bright white frame spectrum chart showing the front bright white frame spectrum measurement results of specific example 3 and comparative example 4 according to the present invention;

fig. 5 is a view distribution diagram illustrating a view distribution measurement result according to example 3 of the present invention;

fig. 6 is a view angle distribution diagram illustrating the view angle distribution measurement result of comparative example 4;

FIG. 7 is a front bright white frame spectrum chart illustrating the front bright white frame spectrum measurement results according to example 3 of the present invention and commercial examples 1 and 2;

in fig. 8, (a), (b), and (c) are view angle distribution diagrams respectively illustrating the results of view angle distribution measurement in commercial example 1, specific example 3 of the present invention, and commercial example 2; and

FIG. 9 is a schematic view illustrating a polarizing plate integrated with a multi-angle privacy film of the present invention and an upper polarizer.

Detailed Description

Before the present invention is described in detail, it should be noted that in the following description, similar components are denoted by the same reference numerals. In addition, the drawings are only for illustrating the spatial relationship between the components and the film layers, and are not for illustrating the substantial thickness, size or relative proportion of each component and film layer.

Next, the multi-angle privacy sheet of the present invention will be described in detail with reference to the following examples.

Referring to fig. 1, the multi-angle peep-proof sheet 2 of the present invention can be applied to a display module 100 to achieve the multi-angle peep-proof effect. The display assembly 100 may be a liquid crystal display, an organic light emitting diode display (OLED), or the like, and has a display surface 101 for displaying, and the multi-angle peep-proof sheet 2 may be bonded to the display surface 101 by means of bonding, or the like, so that the display assembly 100 without a peep-proof effect originally has a multi-angle peep-proof effect. Since the related structure of the display module 100 is known in the art and is not a key point in the present application, no further description is given, in this embodiment, the display module 100 is a liquid crystal display, and only a liquid crystal module 102 of the display module 100, and an upper polarizer 104 and a lower polarizer 103 (the included angle between the light absorption axis of the upper polarizer 104 and the light absorption axis X of the lower polarizer is 90 degrees) respectively located at two opposite sides of the liquid crystal module 102 are simply shown in fig. 1, and the other components are omitted from illustration.

The embodiment of the multi-angle peep-proof plate 2 comprises a polarizer 21, a half wave plate 22 and a high phase difference plate 23.

The polarizer 21 may be obtained by stretching polyvinyl alcohol (PVA) dyed with iodine or other dichroic dyes in a Machine Direction (MD) and then combining with two protective films to convert polarized light emitted from a light source of the display module 100 into polarized light of a specific direction. The thickness of the polarizer 21 is 70-115 μm, and an included angle theta between a light absorption axis A of the polarizer 21 and a light absorption axis X of the upper polarizer 104 is 45 +/-2 degrees.

The optical axis angle of the half-wave plate 22 (i.e. the included angle between the light absorption axis of the half-wave plate 22 and the light absorption axis X of the upper polarizer 104) is 1/2 of the included angle θ between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104, so as to rotate the incident polarized light. In-plane phase difference (R) of the half-wave plate 22 at 550nm wavelength ₀ ) 215-300 nm; in the present embodiment, the half-wave plate 22 has an in-plane phase difference value (R) at a wavelength of 550nm ₀ ) Is between 216 and 296 nm.

Thickness phase difference (R) of the half-wave plate 22 at 550nm wavelength _th ) Between 95 and 180 nm; in some embodiments, the half-wave plate 22 has a thickness phase difference (R) at a wavelength of 550nm _th ) Between 96 and 175 nm.

The high phase difference plate 23 is sandwiched between the polarizer 21 and the half-wave plate 22, and the high phase difference plateThickness phase difference (R) of 23 at 550nm wavelength _th ) Is negative. Preferably, the thickness phase difference value (R) of the high phase difference plate 23 at a wavelength of 550nm _th ) Between-500 and-1800 nm.

In addition, the high retardation film 23 may be formed by film stretching or liquid crystal coating, and may be formed by stacking a single film or a plurality of films.

Preferably, the thickness phase difference value (R) of the high phase difference plate 23 at a wavelength of 550nm _th ) Between-600 nm and-900 nm.

In some embodiments, the thickness phase difference value (R) of the high phase difference plate 23 at a wavelength of 550nm _th ) Between-600 nm and-750 nm.

In some embodiments, the thickness phase difference value (R) of the high phase difference plate 23 at a wavelength of 550nm _th ) Between-750 nm and-900 nm.

In some embodiments, the high phase difference plate 23 is a uniaxial positive C-type plate compensation film, and nz > nx ═ ny of the high phase difference plate 23, wherein nx, ny, nz are refractive indices of the high phase difference plate 23 in the direction of the X, Y, Z axis at a wavelength of 550 nm.

In other embodiments, the refractive index ratio (NZ) of the high phase difference plate 23 at 550nm is between-750 and-1200.

The thickness phase difference value (R) _th ) The in-plane phase difference value (R) ₀ ) And the refractive index ratio (NZ) can be obtained by the following formula;

thickness phase difference value (R) _th ) (nx + ny)/2-nz) x d, d: film thickness of the high phase difference plate 23

In-plane phase difference value (R) ₀ ) (nx-ny) × d, d: the film thickness refractive index ratio (NZ) of the high retardation film 23 is (nx-NZ)/(nx-ny).

When the multi-angle peep-proof sheet is combined with the display assembly and is in a bright state, the central brightness of the multi-angle peep-proof sheet is not less than 90% of the brightness of the display assembly.

To explain the above-mentioned example of the multi-angle peep-proof sheet 2 more specifically, the following comparative example, commercially available examples 1 to 2, examples 1 to 3 and comparative examples 1 to 4 will be explained.

The display module 100 is a liquid crystal display (the general structure is shown in fig. 1), and takes the light absorption axis X of the upper polarizer 104 as 0 degree, and the light absorption axis of the lower polarizer 103 as 90 degrees (i.e. the included angle between the light absorption axis of the lower polarizer 103 and the light absorption axis X of the upper polarizer 104 is 90 degrees, and the light absorption axis is 90 degrees in the following description) as an example, but the practical implementation is not limited thereto. The comparative example is a display module 100 without any privacy sheet attached to the surface thereof, and the commercial examples, specific examples, and comparative examples are privacy displays in which different privacy sheets are attached to the surface of the display module 100. The half-wave plate 22 is attached to the surface of the display element 100 in the embodiments and comparative examples.

Comparative example:

a display: upper polarizer 104 (light absorption axis X is 0 degrees)/liquid crystal module 102/lower polarizer 103 (light absorption axis is 90 degrees).

Commercial example 1:

the peep-proof piece: branding: 3M, type: 3M PF 12.5.

A display: same as the comparative example.

Commercial example 2:

the peep-proof piece: branding: and LG.

A display: same as the comparative example.

Example 1

The peep-proof piece: a polarizer 21 (the light absorption axis a is 45 degrees, that is, the included angle θ between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104 is 45 degrees)/a high phase difference plate 23 (R) _th 600 nm)/half-wave plate 22 (22.5 degrees optical axis angle).

A display: same as the comparative example.

Examples 2 to 3

The embodiments 2 to 3 are the same as the embodiment 1, except that R of the high phase difference plate 23 of the embodiments 2 to 3 _th Respectively-750 nm and-900 nm.

Comparative examples 1 to 3

The structures of comparative examples 1 to 3 are the same as those of the specific examples 1 to 3, respectively, except that the light absorption axis a of the polarizer 21 of the privacy film of the comparative examples 1 to 3 is 0 degree (i.e., the angle θ between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104 is 0 degree).

Comparative example 4

The structure of comparative example 4 is the same as that of example 3, except that the half-wave plate 22 of the privacy plate of comparative example 4 has an optical axis angle of 0 °.

The specific examples and comparative examples are used with different thickness phase difference values (R) _th ) The nx, ny, nz arrangement of the high phase difference plate 23 of (1) is shown in the following table 1:

TABLE 1

R th	-600nm	-750nm	-900nm
				Nx	1.5495	1.5506	1.5493
Ny	1.5493	1.5504	1.5492
				Nz	1.7012	1.6989	1.7016

The structures of the privacy sheets of examples 1 to 3 and comparative examples 1 to 4 are summarized in Table 2.

TABLE 2

Next, the front luminance white image spectrum measurement and the viewing angle distribution measurement were performed by using a Spectroradiometer (model: CS-2000, KONICA-MINOLTA) in the examples 1 to 3 and comparative examples 1 to 4, respectively, and in the comparative example and commercial examples 1 to 2.

The measurement results are summarized in FIGS. 2 to 5 and tables 3 to 5 below. Wherein θ in tables 3 to 5 is an angle between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104, i.e., a lateral viewing angle; psi is the angle from the perpendicular to the center point of the privacy film to the planes on both sides, i.e. the positive viewing angle.

TABLE 3

Wherein the values of the luminance differences of the fifth, eighth, and eleventh rows of table 3 are respectively given by: the luminance value/(0, 0) of (45,0) × 100%, the luminance value/(0, 0) of (60,0) × 100%, and the luminance value/(0, 0) of (75,0) × 100%.

TABLE 4

Wherein, the brightness difference values of the fifth, eighth and eleventh rows in table 4 are respectively represented by: the luminance value/(0, 0) of (45,0) × 100%, the luminance value/(0, 0) of (60,0) × 100%, and the luminance value/(0, 0) of (75,0) × 100%.

TABLE 5

Wherein the values of the contrast difference in the fifth, eighth, and eleventh rows of table 5 are respectively given by: the value of (45,0) contrast/(0, 0) contrast × 100%, (60,0) contrast/(0, 0) contrast × 100%, and (75,0) contrast/(0, 0) contrast × 100%.

Referring to fig. 2, it can be seen from fig. 2 that when the included angle θ between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104 is 0 degree (comparative examples 1 to 3), R of the high phase difference plate 23 is _th The adjustment has no great influence on the bright-state spectrum and the central luminance (i.e., the vertical axis in fig. 2) is lower than that of the control example; in addition, as is clear from the results in table 3, when the included angle θ between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104 is 0 degree, the brightness of different high phase difference plates 23 at different side view angles is also lower than that of the comparative example, which shows that the peep-proof effect is not good in comparative examples 1 to 3.

Referring to fig. 3, it can be seen from fig. 3 that when the included angle θ between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104 is adjusted to be 45 degrees (specific examples 1 to 3), the bright state spectrum is comparable to the comparative example; as can be seen from Table 3, the above-mentioned examples 1 to 3 are excellent in the difference in side-view luminance and the difference in thickness phase (R) of the high phase difference plate 23 _th ) The larger the absolute value of (A), the better the luminance difference is expressed, said specific example 3 (R) _th (-900 nm) at 60 degrees and 75 degrees, the brightness difference was already 1.4% and 2.33%. That is, the luminance of example 3 at 60 degrees and 75 degrees at the side viewing angle (θ) is only left 1.4% and 2.33% of the front luminance, and it is possible to have excellent luminance difference expression at different viewing angles.

Referring to FIGS. 4-6, the structure shown in FIG. 4As can be seen from the front-view bright spectrum results of the specific example 3 and the comparative example 4, controlling the optical axis angle of the half-wave plate 22 can effectively improve the front-view bright appearance. On the other hand, as can be seen from the viewing angle distribution diagrams of FIGS. 5 and 6, and example 3 and comparative example 4, R passing through the high phase difference plate 23 _th And the angle control of the included angle θ between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104, have already been able to have a multi-angle anti-peeping effect initially, but if the optical axis angle control of the half-wave plate 22 is not matched at the same time, the front-view bright state performance is not good (comparative example 4), so the using result of the normal user will be affected; and R passing through the high phase difference plate 23 _th By setting and controlling the angle θ between the light absorption axis a of the polarizer 21 and the light absorption axis X of the upper polarizer 104 and the angle of the optical axis of the half-wave plate 22 (embodiment 3), the privacy guard has excellent front-view bright appearance, and the contrast difference decreases with the increase of the viewing angle, so that the privacy guard has multi-angle privacy protection effect.

Referring to fig. 7, the specific example 3 and the commercial examples 1 and 2 are further subjected to front-view bright state spectrum measurement, and it can be seen from the results that the front-view bright state performance of the specific example 3 is better than that of the commercial examples 1 and 2; as is clear from table 5, the comparison of the above specific example 3 (positive viewing angle (ψ) ═ 0) at different side viewing angles (θ) is equivalent to that of the commercially available examples 1 and 2. Referring to fig. 8, (a) and (c) in fig. 8 are respectively the view angle distribution diagrams of the commercial examples 1 and 2, and (b) in fig. 8 is the view angle distribution diagram of the example 3 of the present invention. As is clear from the viewing angle distribution diagrams of the specific example 3 and the commercial examples 1 and 2, the contrast ratio of the maximum brightness to the minimum brightness of the specific example 3 can be greater than 1000, and the contrast ratio is superior to that of the commercial examples 1 and 2 (about 500-600); in addition, it can be clearly seen from fig. 8 that, compared with the commercially available examples 1 and 2, the peep-proof sheet of the present invention can have a peep-proof effect at both the front viewing angle (ψ) and a plurality of different side viewing angles (θ), and can have a more comprehensive multi-angle peep-proof effect.

Referring to fig. 9, the multi-angle privacy film 2 of the present invention can be pre-integrated with the upper polarizer 104 of the display module 100 shown in fig. 1 to form a polarizer 3. Because the multi-angle peep-proof sheet 2 is directly adhered to the upper polarizer 104, therefore, the polarizing plate 3 can be substituted for the upper polarizer 104 when in production and manufacture, and is directly adhered to the display surface 101 of the display assembly 100, so that the display with the multi-angle peep-proof effect and the front viewing angle brightness and contrast can be manufactured, and the purposes of the utility model can be really achieved.

To sum up, the utility model discloses a let phase value R of high phase difference piece _th Between-500 to-1800 nm, and a half wave plate and a polarizer are respectively arranged on the two opposite surfaces of the high phase difference plate, so that the multi-angle peep-proof purpose can be achieved by utilizing the polarized light to turn, thereby really achieving the purpose of the cost utility model.

The above description is only an embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple changes and modifications made according to the claims and the contents of the description of the present invention are still within the scope of the present invention.

Claims (10)

1. The utility model provides a multi-angle peep-proof piece, is applicable to display module, its characterized in that: comprises the following steps:

a half-wave plate, a polarizer, and a high phase difference plate sandwiched between the half-wave plate and the polarizer,

wherein the thickness phase difference value of the high phase difference plate at the wavelength of 550nm is between-500 nm and-1800 nm.

2. The multi-angle privacy sheet of claim 1, wherein: the thickness phase difference value of the high phase difference plate at the wavelength of 550nm is between-600 nm and-900 nm.

3. The multi-angle privacy sheet of claim 2, wherein: the thickness phase difference value of the high phase difference plate at the wavelength of 550nm is between-750 nm and-900 nm.

4. The multi-angle privacy sheet of claim 1, wherein: the in-plane phase difference value of the half-wave plate is 215-300 nm.

5. The multi-angle privacy sheet of claim 1, wherein: the high phase difference plate is a positive C-shaped plate compensation film.

6. The multi-angle privacy sheet of claim 1, wherein: and nz > nx ═ ny of the high phase difference plate, wherein nx, ny and nz are refractive indexes of the high phase difference plate in the direction of X, Y, Z axes.

7. The multi-angle privacy sheet of claim 6, wherein: the thickness phase difference value of the half-wave plate is 95-180 nm.

8. The multi-angle privacy sheet of claim 7, wherein: when the multi-angle peep-proof sheet is combined with the display assembly and is in a bright state, the central brightness of the multi-angle peep-proof sheet is not less than 90% of the brightness of the display assembly.

9. The multi-angle privacy sheet of claim 7, wherein: the included angle between the light absorption axis of the polarizer of the multi-angle peep-proof sheet and the light absorption axis of the upper polarizer of the display assembly is 45 degrees.

10. A polarizing plate, comprising:

an upper polarizer; and

the multi-angle peep-proof unit comprises a half-wave plate, a polaroid and a high phase difference plate clamped between the half-wave plate and the polaroid,

the half-wave plate is clamped between the upper polarizer and the high phase difference plate, and the thickness phase difference value of the high phase difference plate at the wavelength of 550nm is between-500 nm and-1800 nm.

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