CN117120893A - Polarizing plate and optical display device including the same - Google Patents

Abstract

A polarizing plate and an optical display device including the same are provided, the polarizing plate including a polarizer including a light-transmitting region having a first region and a second region, wherein the first region has a higher monomer transmittance than the second region, a minimum distance (T) from one end of the light-transmitting region to the first region is 20mm or less, the polarizer further including at least one functional layer formed at one end of the light-transmitting region in a thickness direction of the polarizer, and the functional layer including a mixture of an organic material and an inorganic material and/or an organic/inorganic hybrid material.

Description

Polarizing plate and optical display device including same

Technical field

The present invention relates to a polarizing plate and an optical display device including the same.

Background technique

Polarizing plates are used in mobile optical display devices including mobile phones equipped with image sensors.

Referring to (A) of FIG. 7 , the optical display device includes: a display panel (50) including a base layer (51) and a plurality of light-emitting devices (52), a polarizing plate (40) arranged on the display panel (50), and A cover glass (60) on the polarizing plate (40) and an image sensor (10) partially disposed inside the display panel (50). The image sensor (10) is also partially arranged inside the polarizing plate (40). The area (40a) of the polarizing plate (40) corresponding to the image sensor (10) is a non-display area. In order to secure a space for inserting the image sensor (10), the polarizing plate (40) is processed by stamping or the like. However, light leakage may occur in the display area (40b) due to bubbling, cracking, etc. in the area around the punch hole of the polarizing plate (40), resulting in poor image quality.

Referring to (B) of FIG. 7 , the polarizing plate (70) may have an area (70a) formed by a chemical or optical method rather than punching to enable the image sensor (10) and the screen image display area (70b) to operate. However, this structure has the following problem: the display panel (50) including the light emitting device is inevitably demarcated by the image sensor (10), thereby making it difficult to process the optical display device.

Unlike conventional optical display devices as shown in FIG. 7(A) or FIG. 7(B) in which a display panel including a light-emitting device is processed by stamping to ensure a space for inserting an image sensor, recent optical display devices have a structure arranged in The image sensor is underneath the display panel rather than inside the display panel and polarizer. Here, an area of the polarizing plate corresponding to the image sensor is required to implement a screen image display function, a function to prevent the image sensor from being visible during operation of the screen image display function, and a function to enhance image clarity during image acquisition by the image sensor. For this reason, a method of forming a region with high total transmittance in a polarizing plate by optical methods has been proposed. However, this method has the following problem: under high temperature and high humidity conditions, water vapor can invade the polarizing plate through one end thereof so that the total transmittance of this area returns to the level before optical processing, thereby resulting in poor images. quality.

The background technology of the present invention is disclosed in Japanese Unexamined Patent Publication No. 2014-081482.

Contents of the invention

technical problem

An object of the present invention is to provide a polarizing plate having a first region locally formed therein and having a high total transmittance, and which can allow the first region to be formed after being left standing under high temperature and high humidity conditions. The overall transmittance change of the area is minimized.

Another object of the present invention is to provide a polarizing plate having a first region locally formed therein and having a high total transmittance, and which can allow water to pass through after being left standing under high temperature and high humidity conditions. The penetration length of the vapor in the direction of the first area is minimized.

Other objects of the present invention are to provide a polarizing plate that can reduce or minimize the visibility of the image sensor relative to an optical display device when the image sensor is not used, and can enhance the image captured by the image sensor when the image sensor is used. The clarity of the object image.

Technical solutions

One aspect of the invention relates to a polarizing plate.

1. The polarizing plate includes: a polarizing plate including a light-transmitting area having a first area and a second area, wherein the first area has a higher total transmittance than the second area, from one end of the light-transmitting area to the minimum of the first area. The distance (T) is 20 mm or less, and the polarizer also includes at least one functional layer formed in the thickness direction of the polarizer at one end of the light-transmitting area, and the functional layer includes a mixture selected from organic materials and inorganic materials. and at least one of organic-inorganic hybrid materials.

2. In 1, the organic material may include a resin selected from (meth)acrylic, epoxy, modified (meth)acrylic, fluorine, fluorene, olefin and ester resin, and their oligomers. at least one resin, oligomer or monomer among the substances or their monomers.

3. In 1 to 2, the inorganic material may include at least one selected from at least one metal or non-metal selected from the group consisting of silicon, titanium, zirconium, aluminum, boron and tin, and their oxidized materials. substances and their nitrides.

4. In 1 to 3, the organic-inorganic hybrid material may include at least one organic material selected from the organic materials and at least one inorganic material selected from the inorganic materials.

5. In 1 to 3, the functional layer may have a single-layer structure or a multi-layer structure.

6. In 5, the multilayer structure may include: a layer containing inorganic materials and a layer containing organic materials.

7. In 6, the multi-layer structure may also include a primer layer.

8. In 1 to 7, the functional layer may have a water vapor transmission rate of about 1 g/m ² ·24hr or less.

9. In 1 to 8, the functional layer may be formed on the entire surface of the polarizer in the thickness direction.

10. In 1 to 9, the functional layer may have a width of about 100% to about 120% of the maximum width of the first region in the thickness direction of the polarizer.

11. In 1 to 10, the functional layer may have a thickness of about 0.1 μm to about 2000 μm.

12. In 1 to 11, the polarizing plate may have a first polarizing plate area including a first area and a second polarizing plate area including a second area, wherein the first polarizing plate area may have a higher density than the second polarizing plate area. Total transmittance.

13. In 12, the first polarizer region may have a total transmittance of about 50% or higher.

14. In 12, the polarizing plate may further include: a protective layer formed on at least one surface of the polarizing plate.

15. In 14, the functional layer may be further formed in the thickness direction of the protective layer.

16. In 12, the polarizing plate may have a total transmittance change of about 5% or less as calculated according to Equation 2 below:

[Equation 2]

Total transmittance change=|D-C|

(In equation 2,

C is the initial total transmittance (unit: %) of the first polarizer area of the polarizer, and

D is the total transmittance (unit: %) of the first polarizing plate area measured at the same wavelength as C after the polarizing plate was left to stand at 60° C. and 95% relative humidity for 240 hours.

An optical display device according to the present invention includes the polarizing plate according to the present invention.

The optical display device may include: a display panel; a polarizing plate formed on the display panel; and an image sensor disposed below the display panel, wherein the image sensor is disposed below the first area of the polarizing plate.

beneficial effects

The present invention provides a polarizing plate having a first region locally formed therein and having a high total transmittance, and the polarizing plate can increase the total transmittance of the first region after being left standing under high temperature and high humidity conditions. Transmittance changes are minimized.

The present invention provides a polarizing plate having a first region locally formed therein and having a high total transmittance, and the polarizing plate can allow water vapor to evaporate in the first region after being left standing under high temperature and high humidity conditions. The penetration length in the direction of the area is minimized.

The present invention provides a polarizing plate that can reduce or minimize the visibility of an image sensor relative to an optical display device when the image sensor is not used, and can enhance an object image captured by the image sensor when the image sensor is used. of clarity.

Description of drawings

FIG. 1 is a cross-sectional view of a polarizing plate according to an embodiment of the present invention.

FIG. 2 is a plan view of the polarizing plate of the polarizing plate of FIG. 1 .

3 is a cross-sectional view of a polarizing plate according to another embodiment of the present invention.

4 is a cross-sectional view of a polarizing plate according to another embodiment of the present invention.

5 is a cross-sectional view of a polarizing plate according to another embodiment of the present invention.

6 is a cross-sectional view of an optical display device including a polarizing plate according to the present invention.

7 is a cross-sectional view of a conventional optical display device including an image sensor.

8 is a graph showing the total transmission of the first polarizing plate region for the duration (x-axis, unit: hours) of the polarizing plate according to Example 1 and the polarizing plate of Comparative Example 1 left standing at 60° C. and 95% relative humidity. Rate (y-axis, unit: %) plot.

9 is a picture showing the polarizing plate of Example 1 according to the duration of the polarizing plate left standing at 60° C. and 95% relative humidity. Specifically, (A) is a picture of the polarizing plate of Example 1 after the polarizing plate was left to stand for 0 hours, (B) is a picture of the polarizing plate of Example 1 after the polarizing plate was left to stand for 120 hours, and (C) ) is a picture of the polarizing plate of Example 1 after the polarizing plate was left to stand for 240 hours.

10 is a picture showing the polarizing plate of Comparative Example 1 according to the duration of the polarizing plate left to stand at 60° C. and a relative humidity of 95%. Specifically, (A) is a picture of the polarizing plate of Comparative Example 1 after the polarizing plate was left to stand for 0 hours, (B) is a picture of the polarizing plate of Comparative Example 1 after the polarizing plate was left to stand for 120 hours, and (C) ) is a picture of the polarizing plate of Comparative Example 1 after the polarizing plate was left to stand for 240 hours.

Detailed ways

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. It should be understood that the present invention can be embodied in different ways and is not limited to the following embodiments.

In the drawings, components irrelevant to the description are omitted for clarity. The same reference numerals will be used throughout the specification to refer to the same components. It should be noted that the drawings are not accurately to scale, and the length or dimensions of components may be exaggerated solely for convenience and clarity of description.

Herein, spatially relative terms such as "upper" and "lower" are defined with reference to the accompanying drawings. Therefore, it is understood that "upper surface" may be used interchangeably with "lower surface".

As used herein, "total transmittance (Ts)" and "polarization" are values measured at a wavelength of 200 nm to 800 nm, preferably at a wavelength of 550 nm.

As used herein, for "the total transmittance of the first region", at the same wavelength, the first region has the same total transmittance even throughout its entire region. However, when the total transmittance is not the same throughout the first region at the same wavelength, the total transmittance of the first region represents its average total transmittance.

As used herein, for "the total transmittance of the second region", at the same wavelength, the second region has the same total transmittance even throughout its entire region. However, when the total transmittance is not the same throughout the second region at the same wavelength, the total transmittance of the second region represents its average total transmittance.

As used herein, "average total transmittance" refers to the average of the total transmittance over the wavelength range over which the average total transmittance is to be measured. For example, the average total transmittance may be derived from the average of the total transmittance at any specified number of points in the area in which the average total transmittance is to be measured.

As used herein, "water vapor transmission rate (WVTR)" refers to a value measured at 23°C and a relative humidity of 99% to 100%. Although not specifically limited, the water vapor transmittance can be measured using a water vapor transmittance tester (PERMATRAN-W, MODEL700), and the functional layer or polarizer can be cut into a film (10cm × 10cm, width × length) Then measure the water vapor transmittance of the functional layer or polarizer.

As used herein, to express specific numerical ranges, the expression "X to Y" means "≥X and ≤Y."

The polarizing plate according to the present invention can be used in an optical display device including an image sensor (eg, camera, etc.) arranged in a screen image display area thereof. When the image sensor is not used, the polarizing plate according to the present invention can allow the screen image display function to be appropriately performed by reducing or minimizing the visibility of the image sensor outside the display device. When an image sensor is used, the polarizing plate according to the present invention can realize the image acquisition function by enhancing the clarity of the object image collected by the image sensor. As will be described below, when a polarizing plate is used in an optical display device including an image sensor located in a screen image display area thereof, an area of the polarizing plate corresponding to the image sensor may be a first area, and an area other than the first area may be The area may be a second area. Therefore, the first area can realize both the screen image display function and the image acquisition function. The method of forming the first region will be described in further detail below.

The polarizing plate according to the present invention includes a polarizing plate that includes a light-transmitting region having a first region and a second region, and the polarizing plate can make the first region have a total area of Changes in transmittance are minimized, and the penetration length of water vapor penetrating from the outside of the polarizing plate in the direction of the first region can be minimized after being left standing under high temperature and high humidity conditions for a long period of time. In this way, the polarizing plate can appropriately perform both the screen image display function and the function of enhancing the clarity of the object image captured by the image sensor even after being left standing under high temperature and high humidity conditions for a long period of time.

In some embodiments, the first region has a higher total transmittance than the second region, as measured at the same wavelength, and the minimum distance (T) from one end of the light-transmissive region to the first region is 20 mm or less, polarized light The sheet further includes at least one functional layer formed at one end of the light-transmitting region in the thickness direction of the polarizer, and the functional layer includes at least one selected from a mixture of organic and inorganic materials and an organic-inorganic hybrid material.

A polarizing plate according to an embodiment of the present invention will now be described with reference to FIGS. 1 and 2 . FIG. 1 is a cross-sectional view of a polarizing plate according to one embodiment, and FIG. 2 is a plan view of a polarizing plate of the polarizing plate according to one embodiment.

Referring to FIG. 1 , the polarizing plate may include a polarizer (110), a first protective layer (120) formed on the upper surface of the polarizer (110), and a second protective layer formed on the lower surface of the polarizer (110). (130). However, as long as the function of the polarizing plate can be realized without the first protective layer (120) and the second protective layer (130), the first protective layer (120) and the second protective layer (130) may be omitted. One or both.

Referring to Figures 1 and 2, the polarizer (110) includes a light-transmitting area (114) having a first area (112) and a second area (113). In addition, the polarizer (110) also includes a functional layer (111) formed at one end (115) of the light-transmitting region (114) in the thickness direction of the polarizer (110).

In the cross-sectional view, the light-transmitting area (114) is defined by an upper surface of the polarizer (110), a lower surface of the polarizer (110), and two sides of the polarizer connecting the upper surface of the polarizer to its lower surface, The functional layer (111) may be formed on one of the two sides. The functional layer (111) may be formed opposite to the first region (112) with respect to one end (115) of the light-transmitting region (114).

polarizer

As described above, the polarizer (110) includes a light-transmitting area (114) having a first area (112) and a second area (113). The first area (112) and the second area (113) may form a screen image display area of the polarizing plate.

Herein, the "screen image display area" refers to an area in which a screen image is displayed on an optical display device provided with a polarizing plate. The screen image display area may account for 90% to 100% of the total area of the polarizing plate, preferably 100%. In one embodiment, the polarizing plate may not include a non-display area. Here, the "non-display area" refers to an area formed around the periphery of the screen image display area and having a light shielding layer or the like to prevent the light screen, electrodes, etc. from being seen.

The first region (112) has a higher overall transmittance than the second region (113), as measured at the same wavelength. Although both the first area and the second area implement a screen image display function, unlike the second area, the first area may also implement an image acquisition function of an image sensor, such as a camera, described below. In other words, the image acquisition function cannot be implemented in the second area.

In one embodiment, the first region (112) may have an overall transmission of 50% or higher. Within this range, when the image sensor of the optical display device is not used, the first area can reduce the visibility of the image sensor when viewed from outside the display device, thereby enabling the screen image display function to be appropriately realized, and when the image sensor is used , the first area can enhance the clarity of the object image collected by the image sensor. Preferably, the first region (111) has the following total transmittance, for example, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77% , 78%, 79%, 80%, 81%, 82%, 83%, 84% or 85%, specifically, 50% to 85%, 50% to 80% or 60% to 78%.

The first region (112) may include iodide ions. As used herein, the first region may have a different iodide ion concentration profile than the second region (113). For example, compared to the second region (113), the first region (112) may have a relatively small number of PVA-I ₅ ions due to dissociation of PVA-I ₅ ions. Additionally, in the first region (112), at least one of I ⁻ , I ₂ ^-, and I ₃ ^- ions may be present at a higher concentration than the I ₅ ^- ion, whereas in the second region (113), I At least one of ^- , I ₂ ^- and I ₃ ^- ions may be present at a lower concentration than the I ₅ ^- ion.

The cross-section of the first region (112) may have any shape without limitation. For example, the first region may have a closed curved shape or a closed polygonal shape, such as a circle, a semicircle, an ellipse, a semi-oval, a polygon, or an amorphous shape.

Within the above range of the total transmittance of the first region (112), when used in an optical display device including a stacked structure of an image sensor/display panel having a light emitting device/polarizing plate, the polarizing plate may have the above-described desired effect. By sequentially stacking a display panel with a light-emitting device and an image sensor on the lower surface of the first area, the polarizing plate according to the present invention can simultaneously realize the screen image display function and the image collection function. An optical display device according to another aspect of the invention will be described in further detail below.

The second area (113) only implements the screen image display function and has nothing to do with the image acquisition function of the image sensor of the optical display device. In one embodiment, the second region (113) may have a total transmission of: 40% to less than 50%, for example, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47 %, 48%, 49% or 49.9%, specifically 40% to 45%. Within this range, the second area can appropriately implement the screen image display function.

Although the first region (112) and the second region (113) may have the same polarization degree, considering the manufacturing method of the first region described below, it is expected that the first region has a lower polarization degree than the second region.

In one embodiment, the first region (112) may have a polarization degree of 5% to 85%, for example, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% , 50%, 55%, 60%, 65%, 70%, 75% or 80%, specifically, 50% to 75%. Within this range, the first area can be prevented from interfering with object recognition by the camera. In one embodiment, the second region (113) may have a polarization degree of 90% or higher, specifically 90% to 100%. Within this range, the first area can prevent glare due to reflection of external light.

Although the cross-sectional shape of the second area (113) may change according to the appearance of the optical display device, the cross-section of the second area may have a rectangular or square shape.

The above ranges of the total transmittance and polarization degree of the first region can be obtained by optical methods by forming the first region at a portion of the dyed and stretched polyvinyl alcohol-based film. Specifically, the first region can be formed by irradiating a portion of the dyed and stretched polyvinyl alcohol-based film with pulsed light from a xenon flash lamp. In this article, the area not irradiated with pulsed light forms the second area. In the polarizing plate according to the present invention, the first region is not provided in a punched form and the first region and the second region are integrally formed with each other.

The inventors of the present invention have confirmed that when the polarizer or polarizing plate including the first region formed by the optical method is left to stand still under high temperature and high humidity conditions, the polarizer or polarizing plate is not the same as the polarizer or polarizing plate left to stand still under high temperature and high humidity conditions. Compared with before, the total transmittance of the first region is reduced and the penetration length of water vapor in the direction of the first region is increased. If the first area is a hole prepared by punching, these problems will not occur at all. These problems occur because the I ₃ ^-ions or I ^- ions that are optically dissociated and remain in the first region react with I ₂ ions and are thereby converted into I ₅ ^- ions or I ₃ ^- ions, which in turn The water vapor is combined with the polyvinyl alcohol film to form a PVA-I ₅ or PVA-I ₃ composite, in which the portion of the polyvinyl alcohol film corresponding to the first region returns to the state before optical treatment. When the total transmittance of the first region decreases and the penetration length of water vapor in the direction of the first region increases, the first region cannot ensure the clarity of the image during image acquisition by the image sensor and therefore cannot properly implement the image acquisition function.

Even if the second region (113) is formed between the first region (112) and one end (115) of the light-transmitting region (114) so that the first region (112) is not adjacent to one end (115) of the light-transmitting region (114) (As shown in Figure 1), this is still not enough to solve the above problem. Although not specifically limited, the polarizer (110), specifically the second region (113), may have water vapor of 1000g/ ^m2 ·24hr or more, specifically 1000g/ ^m2 ·24hr to 5000g/ ^m2 ·24hr transmittance, and therefore cannot prevent the penetration of water vapor in the thickness direction of the polarizer. The above problem may be more severe when the minimum distance (T) from one end (115) of the light-transmitting area (114) to the first area (112) is 20 mm or less.

The present invention solves the above problem by further forming at least one functional layer (111) including organic materials and inorganic materials at one end (115) of the light-transmitting region (114) in the thickness direction of the polarizer (110).

In one embodiment, the polarizer may have a total transmittance change of 5% or less (specifically 0% to less than 5%, more specifically 0% to 2%) as calculated according to Equation 1 below:

[Equation 1]

Total transmittance change=|B-A|

(In equation 1,

A is the total transmittance of the first region of the polarizer (unit: %),

B is the total transmittance (unit: %) of the first region as measured at the same wavelength as A after leaving the polarizer to stand at 60° C. and 95% relative humidity for 240 hours.

Within this range, even after the polarizing plate is left standing under high temperature and high humidity conditions for a long period of time, the first area can still realize both the screen image display function and the image acquisition function.

Referring again to Figure 2, the minimum distance (T) from one end (115) of the light-transmitting area (114) to the first area (112) is 20 mm or less. When the minimum distance (T) is 20mm or less, the above problem can be more serious. In one embodiment, the minimum distance (T) may be in the range of greater than 0 mm to 20 mm (more preferably 0 mm to 5 mm).

The first area (112) is spaced apart from one end (115) of the light-transmitting area (114). That is, the second region (113) may be formed between the first region (112) and one end (115) of the light-transmitting region (114), so that the first region (112) is not adjacent to the light-transmitting region (114). One end(115). This enables stable positioning of the image sensor inside the display device. However, the present invention is not limited to this.

Referring to Figure 1, a second area (113) may be formed around the periphery of the first area (112). This serves to ensure that a large portion of the polarizer implements the screen image display function, while allowing the first area to act as a smaller portion of the polarizer to implement both the screen image display function and the image capture function.

As described above, the polarizer (110) may further include a functional layer (111) formed in the thickness direction of the polarizer at one end (115) of the light-transmitting region (114). When the functional layer (111) is formed opposite to the first region (112) with respect to one end (115) of the light-transmitting region (114), the functional layer can help prevent external water vapor from penetrating into the light-transmitting region (114) and can improve polarization Chip processability.

The functional layer (111) includes at least one selected from a mixture of organic materials and inorganic materials and organic-inorganic hybrid materials. When the functional layer includes both organic and inorganic materials, the functional layer can help prevent external water vapor penetration while having enhanced adhesion to the polarizer.

The functional layer (111) may have a water vapor transmission rate of 1 g/m ² ·24hr or less, for example, 0g/m ² ·24hr, 0.01g/m ² ·24hr, 0.05g/m ² ·24hr, 0.1g /m ² ·24hr, 0.2g/m ² ·24hr, 0.3g/m ² ·24hr, 0.4g/m ² ·24hr, 0.5g/m ² ·24hr, 0.6g/m ² ·24hr, 0.7g/m ² ·24hr, 0.8g/ ^m2 ·24hr, 0.9g/ ^m2 ·24hr or 1g/m2·24hr, specifically, 0g/ ^m2 ·24hr to 1g/ ^m2 ·24hr ^, more specifically, 1× 10 ^-2 g/m ² ·24hr to 1g/m ² ·24hr. Within this range, the functional layer can help reduce the total transmittance change of the first region after the polarizing plate is left to stand under high temperature and high humidity conditions.

In one embodiment, the functional layer may include a mixture of organic and inorganic materials.

The organic material may include at least one organic material that can achieve the above water vapor transmission rate range when mixed with an inorganic material. For example, the organic material may include at least one resin selected from (meth)acrylic, epoxy, modified (meth)acrylic, fluorine, fluorene, olefin, and ester resins, their oligomers or their monomers. The organic material may include any typical organic material that can be cured by heat or light.

Based on the total weight of the functional layer, the organic material may be included in an amount of 10wt% to 90wt%, for example, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt% or 90wt%, specifically 10wt% to 30wt%. Within this range, the functional layer can help prevent the penetration of external water vapor while having enhanced adhesion to the polarizer.

The inorganic material may include at least one inorganic material that can achieve the above water vapor transmission rate range when mixed with an organic material. For example, the inorganic material may include at least one selected from at least one metal or non-metal selected from the group consisting of silicon, titanium, zirconium, aluminum, boron and tin, their oxides and their nitrogens. In the chemical. Preferably, the inorganic material includes at least one selected from silicon dioxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ).

Based on the total weight of the functional layer, the inorganic material may be included in an amount of 10wt% to 90wt%, for example, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt% or 90wt%, specifically 90wt% to 70wt%. Within this range, the functional layer can help prevent the penetration of external water vapor while having enhanced adhesion to the polarizer.

In another embodiment, the functional layer may include organic-inorganic hybrid materials. As used herein, organic-inorganic hybrid materials refer to composite materials formed by the combination of organic and inorganic components. For example, the organic-inorganic hybrid material may include at least one organic material selected from the above-mentioned organic materials and at least one inorganic material selected from the above-mentioned inorganic materials.

In addition to mixtures of organic and inorganic materials or organic-inorganic hybrid materials, the functional layer may also include additives that can provide the functional layer with desired properties.

The functional layer (111) may have a thickness of about 0.1 μm to about 2000 μm, for example, about 1 μm, 5 μm, 10 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, 1100 μm, 1200 μm, 1300 μm. μm , 1400 μm, 1500 μm, 1600 μm, 1700 μm, 1800 μm, 1900 μm or 2000 μm, specifically, about 1 μm to about 2000 μm. Within this range, the functions of the functional layer can be easily implemented.

Referring to FIG. 2 , a functional layer (111) is formed on the entire surface in the thickness direction of the polarizer (110) at one end (115) of the polarizer (110). However, it will be understood that the present invention is not limited thereto, and the functional layer (111) may have a width corresponding to the width of the first region (112) of the polarizer (110). For example, the functional layer may be formed across only a portion of the entire surface of the polarizer in the thickness direction. Specifically, the functional layer may have a width of 100% to 120% of the maximum width of the first region in the thickness direction of the polarizer. Within this range, the functional layer can minimize the reduction in the total transmittance of the first region after the polarizing plate is left to stand under high temperature and high humidity conditions, and can improve the processability of the polarizing plate. The functional layer (111) having a width of 100% to 120% of the maximum width of the first region in the thickness direction of the polarizer may have a single-layer structure as shown in FIG. 1, or may have a multi-layer structure, as will be referred to Figure 4 describes the multilayer structure in further detail below.

The polarizer (110) may have a thickness of 3 μm to 50 μm, specifically 3 μm to 30 μm. Within this range, the polarizer can be used in a polarizing plate.

first protective layer

A first protective layer (120) can be formed on the upper surface of the polarizer (110) to perform the function of protecting the polarizer.

The first protective layer (120) may be a photocurable coating or protective film. The photocurable coating may include a cured layer formed of a composition containing a photocurable compound or a liquid crystal layer formed of a liquid crystal polymer. The protective film may be a typical protective film for polarizers. For example, the protective film may be formed of at least one resin selected from cellulose resins (including triacetyl cellulose, etc.), polyester resins (including polyethylene terephthalate, polyterephthalate, etc.) Butylene formate, polyethylene naphthalate, polybutylene naphthalate, etc.), cyclic polyolefin resin, polycarbonate resin, polyethersulfone resin, polysulfone resin, Among polyamide resins, polyimide resins, polyolefin resins, polyarylate resins, polyvinyl alcohol resins, polyvinyl chloride resins and polyvinylidene chloride resins.

In one embodiment, the first protective layer (120) may have 1×10 ¹ g/m ² ·24hr or higher, specifically 1×10 ¹ g/m ² ·24hr to 1×10 ³ g/m ² ·24hr water vapor transmission rate. Although the first protective layer has such high water vapor transmittance, the polarizer can reduce the total transmittance change of the first region with the help of the functional layer.

In another embodiment, the first protective layer (120) may have 1×10 ⁰ g/m ² ·24hr or less, specifically 1×10 ⁻¹ g/m ² ·24hr to 1×10 ⁻² g /m ² ·24hr water vapor transmission rate. Within this range, the first protective layer can help reduce the total transmittance change of the first region after the polarizing plate is left to stand under high temperature and high humidity conditions.

The first protective layer (120) may have a thickness of 1 μm to 100 μm, for example, 1 μm to 20 μm. Within this range, the first protective layer can be used in the polarizing plate.

The first protective layer (120) may extend beyond one end (115) of the light-transmitting area (114) of the polarizer (110) to cover the functional layer (111).

Although not shown in Figure 1, the polarizing plate may also include additional layers on the upper surface of the first protective layer (120) to provide additional functions. For example, the additional layers may include a hard coat layer, an anti-fingerprint layer, an anti-reflective layer, a low-reflectivity layer, an anti-glare layer, and the like.

In addition, although not shown in FIG. 1 , the first protective layer (120) may be bonded to the polarizer (110) via an adhesive layer formed of a photocurable or thermosetting adhesive.

second protective layer

A second protective layer (130) can be formed on the lower surface of the polarizer to protect the polarizer. The second protective layer may have a predetermined retardation range to provide anti-reflective properties to the polarizing plate.

The second protective layer (130) may be a single retardation layer, or may be a stack of multiple retardation layers.

In one embodiment, the second protective layer may include a first retardation layer. When external light incident on the polarizing plate passes through the polarizer, the first retardation layer converts the linearly polarized light emitted from the polarizer into circularly polarized light, thereby preventing reflection of the external light and thereby improving screen quality.

The first retardation layer may have an in-plane retardation (Re) of 100 nm to 220 nm, specifically 100 nm to 180 nm, for example λ/4, at a wavelength of 550 nm. Within this range, the first retardation layer can improve screen quality by reducing reflection of external incident light.

In another embodiment, the second protective layer may further include a second retardation layer in addition to the first retardation layer.

The second retardation layer may have an in-plane retardation (Re) of 225 to 350 nm, specifically 225 to 300 nm, for example λ/2, at a wavelength of 550 nm. Within this range, the second retardation layer can reduce reflection of incident external light, thereby improving screen quality.

As used herein, "in-plane retardation (Re)" can be calculated according to the equation: Re=(nx-ny)×d (where nx and ny are the corresponding retardation layer in its slow axis direction and at the wavelength of 550nm, respectively. Its refractive index in the fast axis direction, and d is the thickness of the retardation layer (unit: nm)).

Each of the first retardation layer and the second retardation layer may be a photocurable coating or protective film as described above in the first protective layer.

The second protective layer (130) may have a thickness of 1 μm to 100 μm, for example, 1 μm to 50 μm.

The second protective layer (130) may extend beyond one end (115) of the light-transmitting area (114) of the polarizer (110) to cover the functional layer (111).

Although not shown in FIG. 1, an adhesive layer or adhesive layer may be further formed on the lower surface of the second protective layer (130). The adhesive layer or bonding layer bonds the polarizing plate to the panel of the optical display device, that is, the display panel. In addition, although not shown in FIG. 1 , the second protective layer (130) may be bonded to the polarizer via an adhesive layer formed of a photo-curable or thermosetting adhesive.

Referring again to FIG. 1 , the polarizing plate may include a first polarizing plate region (140) corresponding to (or including) the first region (112) of the polarizing plate (110) and a second region corresponding to (or including) the polarizing plate (110). The second polarizing plate area (150) of (113). The polarizing plate may have a total transmittance change of 5% or less, specifically 0% to less than 5%, and more specifically 0% to 2%, as calculated according to Equation 2 below. Within this range, the first polarizing plate area can realize both the screen image display function and the image capturing function after the polarizing plate is left to stand under high temperature and high humidity conditions for a long period of time.

[Equation 2]

Total transmittance change=|D-C|

(In equation 2,

C is the total transmittance (unit: %) of the first polarizing plate area of the polarizing plate, and

D is the total transmittance (unit: %) of the first polarizing plate area measured at the same wavelength as C after the polarizing plate was left to stand at 60° C. and 95% relative humidity for 240 hours.

The first polarizing plate region may have substantially the same total transmittance and polarization degree as the first region. The second polarizing plate area may have substantially the same total transmittance and polarization degree as the second area.

Then, a method of producing a polarizing plate according to one embodiment of the present invention will be described.

The polarizing plate may be produced by a method comprising the following steps: producing a polarizing plate and bonding the first protective layer and the second protective layer to opposite surfaces of the polarizing plate respectively, wherein the polarizing plate is produced by a method comprising the following steps: preparing a polarizing plate with a material selected from the group consisting of: a polyvinyl alcohol-based film dyed with at least one of iodine and a dichroic dye and subjected to stretching; a first region is formed on a portion of the polyvinyl alcohol-based film by a predetermined treatment; and a polyvinyl alcohol-based film near the first region A functional layer is formed at one end of the vinyl alcohol film. In this article, the area of the polyvinyl alcohol-based film that has not been subjected to the above-mentioned treatment becomes the second area.

The step of bonding the first protective layer and the second protective layer to the polarizer may be performed by any typical method. Therefore, the following description will focus on the process of manufacturing the polarizer.

First, the steps of preparing a polyvinyl alcohol-based film dyed with at least one selected from iodine and dichroic dyes and subjected to stretching will be described.

A dyed and stretched polyvinyl alcohol-based film can be prepared by dyeing and stretching a polyvinyl alcohol-based film. In the manufacture of polarizers, dyeing and stretching are not limited to a specific order. That is, the polyvinyl alcohol-based film may be subjected to dyeing and stretching in sequence or vice versa, or may be subjected to dyeing and stretching at the same time.

The polyvinyl alcohol-based film may be a typical polyvinyl alcohol-based film used in polarizer manufacturing. Specifically, the polyvinyl alcohol-based film may be a film formed of polyvinyl alcohol or a derivative thereof. The polyvinyl alcohol or its derivative may have a polymerization degree of 1000 to 5000 and a saponification degree of 80 mol% to 100 mol%. The polyvinyl alcohol-based film may have a thickness of 1 μm to 30 μm, specifically 3 μm to 30 μm. Within these ranges, polyvinyl alcohol-based films can be used to manufacture thin polarizers.

PVA-based films can withstand washing and swelling with water before dyeing and stretching. By washing the polyvinyl alcohol film with water, foreign matter can be removed from the surface of the polyvinyl alcohol film. By swelling the polyvinyl alcohol-based film, the polyvinyl alcohol-based film can be dyed or stretched more efficiently. In this context, as is well known to those skilled in the art, the polyvinyl alcohol-based membrane may be swollen by immersing it in a swelling bath containing an aqueous solution. The temperature of the swelling bath and the duration of the swelling treatment are not limited to specific conditions. The swelling bath can also contain boric acid, mineral acids, surfactants, etc. and its contents can be adjusted as needed.

The polyvinyl alcohol-based film can be dyed by immersing the polyvinyl alcohol-based film in a dyeing bath containing at least one selected from iodine and a dichroic dye. During the dyeing process, the polyvinyl alcohol film may be immersed in a dyeing solution, which may be an aqueous solution containing iodine or a dichroic dye. Specifically, iodine may be provided in the form of an iodine dye, which may include at least one selected from the following: potassium iodide, hydrogen iodide, lithium iodide, sodium iodide, zinc iodide, lithium iodide, iodine Aluminum, lead iodide and copper iodide. The dyeing solution may be a 1 to 5 wt% aqueous solution of at least one selected from iodine and dichroic dyes. Within this range, the polarizer may have a degree of polarization within the range specified herein, and thus may be used in an optical display device.

The dyeing bath may have a temperature of 20°C to 45°C, and the polyvinyl alcohol-based film may be immersed in the dyeing bath for 10 seconds to 300 seconds. Within these ranges, polarizers with high polarization degrees can be obtained.

By stretching the polyvinyl alcohol-based film in a stretching bath, the polyvinyl alcohol-based film can exhibit polarization properties (polarizability) through orientation of at least one selected from iodine and dichroic dyes. Specifically, the polyvinyl alcohol-based film can be stretched by either dry stretching or wet stretching. Dry stretching can be achieved by inter-rollstretching, extrusion stretching, heated-roll stretching, etc., and can be achieved using a wet stretching bath containing water at 35°C to 65°C Wet stretching. Wet stretching baths can also contain boric acid to enhance the stretching effect.

The polyvinyl alcohol-based film may be stretched to a predetermined elongation, specifically to a total elongation of 5 to 7 times its original length, specifically 5.5 to 6.5 times. Within this elongation range, the polyvinyl alcohol-based film can be prevented from tearing or wrinkling during stretching while achieving a polarizer with improved polarization degree and transmittance. Stretching can be achieved by uniaxial stretching not only through single-stage stretching but also through multi-stage stretching (such as two-stage stretching, three-stage stretching), thereby enabling the production of a crack-free thin polarizer.

Although the polyvinyl alcohol-based film is subjected to stretching after dyeing in the above description, dyeing and stretching may be performed in the same reaction bath.

The polyvinyl alcohol-based film may be subjected to cross-linking in a cross-linking bath before or after stretching the dyed polyvinyl alcohol-based film. Cross-linking is a process that causes at least one selected from iodine and dichroic dyes to be deposited on the polyvinyl alcohol-based film more vigorously, and can be performed using boric acid as a cross-linking agent. The cross-linking bath may also contain phosphate compounds, potassium iodide, etc. to improve the cross-linking effect.

Dyed and stretched polyvinyl alcohol-based films can be subjected to color correction in a color correction bath. In the color correction process, the dyed and stretched polyvinyl alcohol-based film is immersed in a color correction bath filled with a color correction solution containing potassium iodide. Therefore, the color value of the polarizer can be reduced while the durability of the polarizer can be improved by removing the iodine anion ^I- . The color correction bath may have a temperature of 20°C to 45°C, and the polyvinyl alcohol-based film may be immersed in the color correction bath for 10 seconds to 300 seconds.

Then, the first region may be formed by treating a portion of the polyvinyl alcohol-based film.

The first region can be formed by irradiating an area of the polyvinyl alcohol-based film with pulsed light from a xenon flash lamp.

Once a region is formed with a lower polarization than before irradiation, xenon flash lamps emitting pulses at a continuous wavelength from 200 nm to 800 nm can reduce the sensitivity of lasers selected from iodine and dichroic lasers compared to conventional femtosecond or picosecond lasers. Damage to the depolarization region of the polyvinyl alcohol-based film dyed with at least one sex dye.

Can be irradiated 1 to 10 times with light emitted from a xenon flash lamp in pulsed form under the following conditions: power output from 300V to 500V; pulse frequency from 0.5Hz to 2Hz; and irradiation duration from 5ms (milliseconds) to 15ms . Under these conditions, the first region according to the invention can be easily obtained. When irradiating with light, a mask having a predetermined shape may be brought into close contact with the upper surface of the dyed and stretched polyvinyl alcohol-based film so that the portions that do not require depolarization maintain their original light transmittance.

Then, a functional layer is formed at one end of the polyvinyl alcohol-based film near which the first region has been formed.

The functional layer can be formed by applying a composition including the above-mentioned organic type material and inorganic type material to the first surface of the polarizer by a predetermined method. For example, the functional layer can be formed by spraying, dipping, deposition (eg, PVD), curing (eg, thermal curing or light curing), coating, or the like.

Then, a polarizing plate production method according to another embodiment of the present invention will be described.

The polarizing plate can be produced by a method including: preparing a dyed and stretched polyvinyl alcohol film; forming a functional layer at one end of the polyvinyl alcohol film; bonding the first protective layer and the second protective layer to the polyvinyl alcohol film, respectively. an opposing surface of the vinyl alcohol-based film; and forming the first region by applying a predetermined treatment to a portion of the polyvinyl alcohol-based film. In this context, the untreated area of the polyvinyl alcohol-based film forms the second area.

Then, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 3 . FIG. 3 is a cross-sectional view of the polarizing plate according to this embodiment.

Referring to Figure 3, the polarizing plate includes a polarizer (110), a first protective layer (120) formed on the upper surface of the polarizer (110); and a second protective layer formed on the lower surface of the polarizer (110). (130), wherein the polarizer (110) includes a functional layer (116) formed in the thickness direction of the polarizer (110) at one end of the light-transmitting region having the first region (112) and the second region (113). ). In this embodiment, the functional layer (116) is also formed in the thickness direction of the first protective layer (120) and the second protective layer (130). The polarizing plate according to this embodiment is basically the same as the polarizing plate shown in FIG. 1 except that the functional layer (116) of the first protective layer (120) and the second protective layer (130) is also formed in the thickness direction.

By forming a functional layer (116) in the thickness direction of the polarizing plate at each end of the polarizing plate, the first protective layer and the second protective layer, the workability of the functional layer and the polarizing plate can be improved.

Then, polarizing plates according to other embodiments of the present invention will be described with reference to FIG. 4 . 4 is a cross-sectional view of the polarizing plate according to this embodiment.

Referring to Figure 4, the polarizing plate includes a polarizer (110), a first protective layer (120) formed on the upper surface of the polarizer (110), and a second protective layer (120) formed on the lower surface of the polarizer (110). 130), wherein the polarizer (110) includes a functional layer (117) formed in the thickness direction of the polarizer at one end (115) of the light-transmitting region having the first region (112) and the second region (113), And a functional layer (117) is also formed in the thickness direction of the first protective layer (120) and the second protective layer (130), and the functional layer has a multi-layer structure. The polarizing plate according to this embodiment is basically the same as the polarizing plate shown in FIG. 3 except that its functional layer has a multi-layer structure. Therefore, the following description will only discuss the functional layer (117).

The functional layer (117) includes organic materials and inorganic materials and has a two-layer structure including a first functional layer (117a) and a second functional layer (117b). In one embodiment, the first functional layer (117a) may include an inorganic type material and the second functional layer (117) may include an organic type material. In another embodiment, the first functional layer (117a) may include an organic type material and the second functional layer (117) may include an inorganic type material. Such a double-layer structure including a first functional layer (117a) and a second functional layer (117b) formed of different materials may facilitate the fabrication of the functional layer (117). Organic type materials and inorganic type materials are basically the same as those described above.

Although FIG. 4 shows that the first functional layer (117a) has a single-layer structure, the first functional layer may have a multi-layer structure. Although FIG. 4 shows that the second functional layer (117b) has a single-layer structure, the second functional layer may have a multi-layer structure.

Each of the first functional layer (117a) and the second functional layer (117b) may have the same thickness, or may have different thicknesses. For example, each of the first functional layer and the second functional layer may have a thickness of 1 μm to less than 2000 μm, specifically 1 μm to 100 μm. Within this range, the functions desired by the functional layer can be easily realized.

The functional layer (117) may have a thickness of 0.1 μm to 2000 μm, specifically 1 μm to 2000 μm. Within this range, the functions desired by the functional layer can be easily realized.

Although not shown in FIG. 4, it may be formed between the first functional layer (117a) and the second functional layer (117b) and/or between one end (115) of the light-transmitting region and the first functional layer (117a). Primer layer to improve the adhesion between the first functional layer (117a) and the second functional layer (117b). The primer layer may be formed of any typical material known to those skilled in the art, such as acrylic resin, epoxy resin, and polyester resin.

Then, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 5 . FIG. 5 is a cross-sectional view of the polarizing plate according to this embodiment.

Referring to Figure 5, the polarizing plate includes a polarizer (110), a first protective layer (120) formed on the upper surface of the polarizer (110), and a second protective layer (120) formed on the lower surface of the polarizer (110). 130), wherein the polarizer (110) includes: a functional layer (116) formed at one end of the first surface (115) having the first region (112) and the second region (113) in the thickness direction of the polarizer ); and an adhesive layer (160) formed on one surface of the functional layer (116) in the thickness direction of the functional layer (116). A functional layer (116) is also formed in the thickness direction of the first protective layer (120) and the second protective layer (130). The polarizing plate according to this embodiment is basically the same as that of FIG. 3 except that the adhesive layer (160) is formed on one surface of the functional layer (116) in the thickness direction of the functional layer (116).

The adhesive layer (160) is used to improve the adhesion between the functional layer (116) and the polarizer (110), the first protective layer (120) and/or the second protective layer (130). The adhesive layer (160) may be optically clear adhesive (OCA) or optically clear resin (OCR), but is not limited thereto.

Then, an optical display device according to one embodiment of the present invention will be described.

An optical display device according to the present invention includes the polarizing plate according to the present invention. The optical display device may comprise an organic light emitting diode display or a liquid crystal display, preferably an organic light emitting diode display.

The optical display device according to the present invention will be described in more detail with reference to FIG. 6 .

Referring to FIG. 6 , the organic light emitting diode display device may include a display panel (200) formed of a base layer (201) and a plurality of light emitting devices (202), a polarizing plate (100) formed on the display panel (200), and a polarizing plate (100) formed on the display panel (200). A cover glass (300) formed on the panel (100) and an image sensor (400) arranged below the display panel (200). Here, the display panel (200) does not have a through hole for inserting the image sensor (400).

The polarizing plate (100) includes a first polarizing plate area (140) and a second polarizing plate area (150). The polarizing plate may include the polarizing plate according to the present invention. Both the first polarizing plate area (140) and the second polarizing plate area (150) define a screen image display area of the optical display device. The polarizing plate (100) does not have a through hole for inserting the image sensor (250).

The first polarizer region (140) provides the light emitting device (202) at a lower density than the second polarizer region (150). Through this structure, the polarizing plate can simultaneously realize the object image display function of the image sensor (400) and the screen image display function of the display panel (200).

The image sensor (400) is arranged below the first polarizing plate area (140). The image sensor (400) may include a camera or the like, but is not limited thereto.

invention pattern

Then, the invention will be described in more detail with reference to some embodiments. However, it should be noted that these examples are provided for illustrative purposes only and should not be construed as limiting the invention in any way.

Detailed descriptions of the components used in the examples and comparative examples are as follows:

(1) Polarizer: polyvinyl alcohol film (VF-PE3000, Kuraray Co., Ltd., Japan, thickness: 30 μm)

(2) Protective film: cellulose triacetate film (KC4UYW, Konica Minolta Inc., Japan, thickness: 40 μm)

Example 1

The polyvinyl alcohol-based film washed with water was subjected to swelling in a swelling bath containing water with a temperature of 30°C.

After the swelling treatment, the polyvinyl alcohol film is immersed in a dyeing bath containing a 3 wt% potassium iodide aqueous solution having a temperature of 30° C. for 30 seconds to 200 seconds. The dyed polyvinyl alcohol-based film was passed through a wet cross-linking bath containing 3 wt% boric acid aqueous solution having a temperature of 30°C to 60°C. Thereafter, the polyvinyl alcohol-based film was stretched in a 3 wt% boric acid aqueous solution having a temperature of 50° C. to 60° C. to reach a total elongation of 6 times its initial length, thereby preparing a dyed and stretched polyvinyl alcohol-based film. membrane.

Then, a laminate was prepared by bonding a protective film to both surfaces of the prepared polyvinyl alcohol-based film via an adhesive (Z-200, Nippon Goshei, Co., Ltd.).

The laminate is cut into a predetermined size, and the first region is formed by irradiating only a region of the laminate corresponding to the first region with pulsed light of a wavelength of 200 nm to 800 nm using a xenon flash lamp. Then, a mixture of acrylic resin (3318LV, Henkel Co., Ltd.) as an organic material and silica (SiO ₂ ) (SO-C2, Sakai Chemical Industry Co., Ltd.) as an inorganic material is layered. The functional layer can be formed by coating to a predetermined thickness on one end of the laminate and then UV curing; or by depositing each of the above-mentioned organic materials and inorganic materials on one end of the laminate by PVD, CVD, etc. Therefore, a polarizing plate having a cross section as shown in Fig. 3 is obtained.

Example 2 to Example 3

A polarizing plate having a cross section as shown in FIG. 3 was manufactured in the same manner as in Example 1, except that the types of organic-based materials and inorganic-based materials used were changed or the thickness of the functional layer was changed.

Example 4

A polarizing plate was manufactured in the same manner as in Example 1, except that an inorganic-based material layer, a primer layer, an organic-based material layer, and an inorganic-based material layer were sequentially stacked on one end of the first surface of the laminate.

Example 5

A polarizing plate was produced in the same manner as in Example 4 except that the type of inorganic material used was changed.

Comparative example 1

A polarizing plate was manufactured in the same manner as in Example 1 except that the functional layer was not formed.

Comparative example 2

A polarizing plate was manufactured in the same manner as in Example 1, except that a functional layer including only organic-based materials without any inorganic-based materials was formed.

Comparative example 3

A polarizing plate was manufactured in the same manner as in Example 1, except that a functional layer including only inorganic-based materials without any organic-based materials was formed.

Comparative example 4

A polarizing plate was manufactured in the same manner as in Example 1, except that a functional layer including only organic-based materials without any inorganic materials was formed.

For the following properties, each polarizing plate manufactured in the Examples and Comparative Examples was evaluated, and the results are shown in Table 1, Figure 8, Figure 9, and Figure 10.

(1) Water vapor transmission rate of the functional layer (unit: g/m ² ·24hr): A film (10cm×10cm) is prepared by using organic materials and inorganic materials forming the functional layer and the film is subjected to water vapor transmission The water vapor of the functional layer of each polarizing plate manufactured in the Examples and Comparative Examples was indirectly evaluated by standing in a pass rate tester (PERMATRAN-W, MODEL 700) at 23° C. and a relative humidity of 99% to 100%. transmittance.

(2) Total transmittance of the first region and the second region (unit: %): At a wavelength of 200 nm to 800 nm, each manufactured in the Examples and Comparative Examples was measured using a UV-visible spectrophotometer V730 (JASCO Corporation). The total transmittance is measured in the first area and the second area of the polarizing plate.

(3) Calculation of the total transmittance change (unit: %) by Equation 2: In the same manner as in (2), for each polarizing plate manufactured in the Example and Comparative Example and the glass plate by sequentially stacking the glass plates The prepared sample was used to measure the total transmittance of the first polarizing plate area. The specimens were then left to stand at 60°C and 95% relative humidity for 240 hours. Then, the total transmittance of the first polarizing plate area is measured in the same manner as in (2). Table 1 shows the total transmittance of the first polarizing plate area before and after the sample was left standing for 240 hours. Based on these values, the total transmittance change is obtained according to Equation 2.

(4) Penetration length (unit: mm): As in (3), each polarizing plate manufactured in the Examples and Comparative Examples was left to stand at 60° C. and a relative humidity of 95% for 240 hours. Using an analytical instrument, the penetration length of water vapor from one end of the first side of the polarizer is measured by optical microscopic distance measurement. Penetration lengths of 10mm or less are desired.

(5) Color change: Each polarizing plate sample (including the first area and the second area) of Example 1 and Comparative Example 1 was left to stand at 60°C and a relative humidity of 95% for 0 hours, 120 hours and 240 hours. Hour. Then, the color change of the first area according to the duration of standing of the sample is observed. Figures 9 and 10 also show the results.

Table 1

*In Table 1, the minimum distance T refers to T in Figure 2.

*In Table 1, the fluorine-based organic material is EMGALT0002 (USA/TASCO).

*In Table 1, Al ₂ O ₃ was obtained from TALALT0006 (USA/TASCO).

As shown in Table 1, the polarizing plate according to the present invention includes a first region that is locally formed and has a high total transmittance, and the polarizing plate can change the total transmittance of the first region after being left standing under high temperature and high humidity conditions. Minimize, while minimizing the penetration length of water vapor in the direction of the first region after standing under high temperature and high humidity conditions. Although not shown in Table 1, this shows that the polarizing plate according to the present invention can ensure that the first region properly performs both the screen image display function and the image capturing function even after being left standing under high temperature and high humidity conditions for a long period of time. In addition, as shown in FIG. 8 , the polarizing plate of Example 1 has extremely low change in total transmittance. Furthermore, as shown in FIG. 9 , after being left standing at 60° C. and a relative humidity of 95% for a long period of time, the polarizing plate of Example 1 showed an insignificant color value change in the first region.

In contrast, although the polarizing plates of Comparative Examples 1 to 4 have a larger minimum distance T than the polarizing plates of Examples and include a first region arranged farther from one end of the light-transmitting region, they are different from those of the polarizing plates of Examples. In comparison, the total transmittance change of the first region of each polarizing plate of Comparative Examples 1 to 4 is not within the range according to the present invention and the penetration length of water vapor is significant after being left standing under high temperature and high humidity conditions for a long period of time. rise. In addition, as shown in FIG. 8 , the polarizing plate of Comparative Example 1 showed an extremely high change in total transmittance. Furthermore, as shown in FIG. 10 , in the polarizing plate of Comparative Example 1, as the duration of the polarizing plate left standing at 60° C. and 95% relative humidity increases, the color value of the first region changes to be substantially equal to The level of the second area indicates that the total transmittance of the first area returns to the level before treatment with pulsed light.

It should be understood that various modifications, changes, variations and equivalent embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (18)

1. A polarizing plate, including: A polarizer including a light-transmitting area having a first area and a second area, wherein said first region has a higher total transmittance than said second region, The minimum distance (T) from one end of the light-transmitting area to the first area is 20mm or less, The polarizer further includes at least one functional layer formed in the thickness direction of the polarizer at one end of the light-transmitting area, and The functional layer includes at least one selected from a mixture of organic materials and inorganic materials and organic-inorganic hybrid materials. 2. The polarizing plate according to claim 1, wherein the organic material is selected from (meth)acrylates, epoxy, modified (meth)acrylics, fluorine, fluorene, and olefins and at least one of ester resins, oligomers thereof or monomers thereof. 3. The polarizing plate according to claim 1, wherein the inorganic material includes at least one selected from at least one metal or non-metal selected from the group consisting of silicon, titanium, zirconium, aluminum, In boron and tin, their oxides and their nitrides. 4. The polarizing plate according to claim 1, wherein the organic-inorganic hybrid material includes at least one organic material selected from organic materials and at least one inorganic material selected from inorganic materials. 5. The polarizing plate according to claim 1, wherein the functional layer is a single-layer structure or a multi-layer structure. 6. The polarizing plate according to claim 5, wherein the multilayer structure includes a layer containing the inorganic material and a layer containing the organic material. 7. The polarizing plate according to claim 6, wherein the multi-layer structure further includes a primer layer. 8. The polarizing plate according to claim 1, wherein the functional layer has a water vapor transmittance of about 1 g/ ^m2 ·24hr or less. 9. The polarizing plate according to claim 1, wherein the functional layer is formed on the entire surface of the polarizing plate in the thickness direction. 10. The polarizing plate according to claim 1, wherein the functional layer has a width of about 100% to about 120% of a maximum width of the first region in a thickness direction of the polarizing plate. 11. The polarizing plate according to claim 1, wherein the functional layer has a thickness of about 0.1 μm to about 2000 μm. 12. The polarizing plate according to claim 1, wherein the polarizing plate has a first polarizing plate area including the first area and a second polarizing plate area including the second area, the first polarizing plate The area has a higher total transmittance than the second polarizing plate area. 13. The polarizing plate of claim 12, wherein the first polarizing plate region has a total transmittance of about 50% or higher. 14. The polarizing plate according to claim 12, further comprising: A protective layer formed on at least one surface of the polarizer. 15. The polarizing plate according to claim 14, wherein the functional layer is further formed in the thickness direction of the protective layer. 16. The polarizing plate according to claim 12, wherein the polarizing plate has a total transmittance change of about 5% or less calculated according to the following Equation 2: [Equation 2] Total transmittance change=|D-C| (In equation 2, C is the initial total transmittance (unit: %) of the first polarizing plate area of the polarizing plate, and D is the total transmittance (unit: %) of the first polarizing plate area measured at the same wavelength as C after the polarizing plate was left to stand at 60° C. and 95% relative humidity for 240 hours. . 17. An optical display device comprising the polarizing plate according to any one of claims 1 to 16. 18. The optical display device of claim 17, comprising: display panel; the polarizing plate formed on the display panel; and An image sensor is arranged below the display panel, and the image sensor is arranged below the first area of the polarizing plate.