Polarizing plate and optical display device including the polarizing plate

Abstract

A polarizing plate and an optical display device including the polarizing plate are provided. The polarizing plate includes a polarizer and a protective layer formed on at least one surface of the polarizer, wherein: the polarizing plate includes a first region and a second region formed within an image display area; the first region and the second region have different monolithic transmittances at the same wavelength; and the first region has a monolithic transmittance of 45% to 85%, a maximum absorbance of 1.0 to 5.0 at wavelengths in the range of about 270 nm to about 325 nm, a maximum absorbance of 0.5 to 4.0 at wavelengths greater than about 325 nm and less than or equal to 420 nm, and a maximum absorbance of 0.5 or less at wavelengths in the range of about 500 nm to about 800 nm.

Description

Technical Field

[0001] This invention relates to polarizing plates and optical display devices including them. Background Technology

[0002] Polarizing plates are provided to optical display devices to display images or improve image quality. In mobile displays such as mobile phones, polarizing plates can be used as intermediate paths for image sensors such as cameras to capture pictures or videos.

[0003] refer to Figure 5 (A) The optical display device includes: a display panel (50) comprising a base layer (51) and a plurality of light-emitting diodes (52); a polarizing plate (40) formed on the display panel (50); a cover glass (60) formed on the polarizing plate (40); and an image sensor (10) configured to pass through a portion of the display panel (50). The image sensor (10) is disposed inside the polarizing plate (40) to pass through a portion of the polarizing plate (40). The region (40a) of the polarizing plate (40) corresponding to the image sensor is a non-image display region. To ensure space for accommodating the image sensor (10), the polarizing plate (40) is processed by physical stamping. However, in this case, the image display region (40b) may provide a poor image due to cracks in the region surrounding the stamped region (40a) of the polarizing plate (40).

[0004] refer to Figure 5 (B) The optical display device may include a polarizing plate (70), which is formed by chemical or optical methods rather than by physical stamping of the polarizing plate (40) (e.g. Figure 5 As shown in (A), the image sensor (10) has an area (70a) for operating the image sensor (10) and an image display area (70b). In this case, the area (70a) corresponds to the non-image display area. Furthermore, the display panel (50) including the light-emitting diodes is separated from the image sensor (10), making it difficult to perform processing, etc.

[0005] In recent years, such as Figure 5 (A) and Figure 5 As shown in (B), an optical display device has been developed in the art that includes an image sensor disposed at its lower part, rather than defining an area for the image sensor to penetrate a portion of the display panel including light-emitting diodes to ensure space for the image sensor.

[0006] In this case, it is also necessary to perform image display functions corresponding to the area of ​​the polarizer of the image sensor, and to prevent visual observation by the external image sensor during the image display process, while providing a clear image during the shooting process. However, there are limitations to using typical polarizers in the aforementioned optical display devices.

[0007] The background technology of the present invention is disclosed in Japanese Unexamined Patent Publication No. 2014-081482, etc. Summary of the Invention

[0008] Technical issues

[0009] One aspect of the present invention provides a polarizing plate that is applied to an optical display device in which an image sensor (such as a camera) is disposed in its image display area, and can perform an image display function by suppressing visual observation of an external image sensor when the image sensor is not used, while improving the resolution of the image when the image sensor is used.

[0010] Another aspect of the present invention is to provide a polarizing plate with good durability.

[0011] Technical solution

[0012] One aspect of the present invention relates to a polarizing plate.

[0013] 1. A polarizing plate includes: a polarizer; and a protective layer formed on at least one surface of the polarizer, wherein the polarizing plate has a first region and a second region in an image display region, wherein the first region and the second region have different total transmittances at the same wavelength; and wherein the first region has a total transmittance of 45% to 85%, wherein the first region has a maximum absorbance of 1.0 to 5.0 in a wavelength range of about 270 nm to about 325 nm, a maximum absorbance of 0.5 to 4.0 in a wavelength range of greater than about 325 nm to about 420 nm, and a maximum absorbance of 0.5 or less in a wavelength range of about 500 nm to about 800 nm.

[0014] 2. A polarizing plate includes a polarizer and a protective layer formed on at least one surface of the polarizer, wherein the polarizer includes a first region and a second region in an image display region, the first region and the second region having different total transmittances at the same wavelength; and the first region has a total transmittance of 45% to 85%, and the first region has a maximum absorbance of 1.0 to 5.0 in a wavelength range of about 270 nm to about 325 nm, a maximum absorbance of 0.5 to 4.0 in a wavelength range of greater than about 325 nm to about 420 nm, and a maximum absorbance of 0.5 or less in a wavelength range of about 500 nm to about 800 nm.

[0015] 3. A polarizing plate includes a polarizer and a protective layer formed on at least one surface of the polarizer, and wherein the polarizing plate has a first region and a second region in an image display area, wherein the first region and the second region have different total transmittances at the same wavelength; and the first region has a total transmittance variation rate of 10% or less, as calculated by Equation 1:

[0016] [Equation 1]

[0017] Total transmittance change rate = (TS1-TS2) / TS1 x100

[0018] (In equation 1,

[0019] TS1 is the total transmittance (in %) of the first region at a wavelength of 550 nm, and

[0020] TS2 is the total transmittance (in %) of the first region at a wavelength of 550 nm after the polarizer has been placed at 85°C for 120 hours or at 85°C and 85% relative humidity for 120 hours.

[0021] 4. In 1-2, the first region may have a maximum absorbance of greater than 1.0 to 5.0 in the wavelength range of about 270 nm to about 325 nm and a maximum absorbance of greater than 0.5 to 4.0 in the wavelength range of greater than about 325 nm to about 420 nm.

[0022] 5. In 1-2 and 4, in the first region, the maximum absorbance in the wavelength range of about 270 nm to about 325 nm can be higher than the maximum absorbance in the wavelength range of greater than about 325 nm to about 420 nm.

[0023] 6. In 1-2 and 4-5, the second region may have a lower maximum absorbance than the first region in a wavelength range of about 270 nm to about 420 nm, and may have a higher maximum absorbance than the first region in a wavelength range of greater than about 420 nm to about 800 nm.

[0024] 7. In 6, the second region may have a maximum absorbance of 0.5 to 3.0 in the wavelength range of about 270 nm to about 420 nm and a maximum absorbance of 0 to 0.6 in the wavelength range of greater than about 420 nm to about 800 nm.

[0025] 8. In 1-2 and 4-7, the difference in total transmittance between the first and second regions can be in the range of 5% to 45%.

[0026] 9. In 1-2 and 4-8, the first region may have a lower total transmittance than the second region in the wavelength range of about 270 nm to about 420 nm, and may have a higher total transmittance than the second region in the wavelength range of greater than about 420 nm to about 800 nm.

[0027] 10. In 1-2 and 4-9, the first region may have a total transmittance of 15% or less in the wavelength range of about 270 nm to about 325 nm, a total transmittance of 25% or less in the wavelength range of greater than about 325 nm to about 420 nm, and a total transmittance of 45% or greater in the wavelength range of about 500 nm to about 800 nm.

[0028] 11. In 3, the first region may have a total transmittance of 45% to 85% and may have a maximum absorbance of 1.0 to 5.0 in the wavelength range of about 270 nm to about 325 nm, a maximum absorbance of 0.5 to 4.0 in the wavelength range of greater than about 325 nm to about 420 nm, and a maximum absorbance of 0.5 or less in the wavelength range of about 500 nm to about 800 nm.

[0029] 12. In 3 and 11, the first region may have a maximum absorbance of greater than 1.0 to 5.0 in the wavelength range of about 270 nm to about 325 nm and a maximum absorbance of greater than 0.5 to 4.0 in the wavelength range of greater than about 325 nm to about 420 nm.

[0030] 13. In 3 and 11-12, the second region may have a maximum absorbance of 0.5 to 3.0 in the wavelength range of about 270 nm to about 420 nm and a maximum absorbance of 0 to 0.6 in the wavelength range of greater than about 420 nm to about 800 nm.

[0031] Another aspect of the present invention relates to an optical display device comprising a polarizing plate according to the present invention.

[0032] An optical display device may include a display panel, a polarizing plate formed on the upper surface of the display panel, and an image sensor formed below the display panel, wherein the image sensor may be disposed below a first region of the polarizing plate.

[0033] Beneficial effects

[0034] The present invention provides a polarizing plate that is applied to an optical display device in which an image sensor (such as a camera) is provided in its image display area. It can perform image display function by suppressing visual observation of an external image sensor when the image sensor is not used, while improving image resolution when the image sensor is used.

[0035] This invention provides a polarizing plate with good durability. Attached Figure Description

[0036] Figure 1 It is a graph depicting the relationship between wavelength and absorbance in the first region of each polarizing plate (or polarizer) in Comparative Example 1 and Comparative Example 2 according to an embodiment of the present invention.

[0037] Figure 2 It is a graph depicting the relationship between the wavelength and total transmittance of the first region in each polarizing plate (or polarizer) of Comparative Example 1 and Comparative Example 2 according to an embodiment of the present invention.

[0038] Figure 3 This is a cross-sectional view of a polarizing plate according to an embodiment of the present invention.

[0039] Figure 4 This is a cross-sectional view of an optical display device including a polarizing plate according to the present invention.

[0040] Figure 5 This is a cross-sectional view of a typical optical display device, including an image sensor. Detailed Implementation

[0041] Best mode

[0042] In the following description, embodiments of the invention will be detailed with reference to the accompanying drawings, enabling those skilled in the art to readily implement the invention. It should be understood that the invention can be implemented in different ways and is not limited to the following embodiments.

[0043] In the accompanying drawings, components irrelevant to the description are omitted for clarity, and the same components will be indicated by the same reference numerals throughout the specification. Although the length, thickness, or width of various components may be exaggerated in the drawings for understanding, the invention is not limited thereto.

[0044] In this document, spatial relative terms such as “upper” and “lower” are defined with reference to the accompanying drawings. Therefore, it should be understood that “upper surface” and “lower surface” can be used interchangeably.

[0045] In this article, "absorbance" refers to total light absorbance.

[0046] In this paper, the “total transmittance (Ts)” and “polarization” of the polarizing plate are values ​​measured at wavelengths from 200 nm to 800 nm, preferably at a wavelength of 550 nm.

[0047] In this paper, the term "total transmittance of the first region" refers to the fact that the first region has the same total transmittance throughout its entire region, even at the same wavelength. However, when the total transmittance of the first region is not the same at the same wavelength throughout its entire region, the total transmittance of the first region refers to the average of its total transmittance.

[0048] In this paper, the term "total transmittance of the second region" refers to the fact that the second region has the same total transmittance throughout its entire region, even at the same wavelength. However, when the total transmittance of the second region is not the same at the same wavelength throughout its entire region, the total transmittance of the second region refers to the average of its total transmittance.

[0049] In this paper, "average total transmittance" refers to the average total transmittance of the region to be measured. For example, the average total transmittance can be obtained from the average total transmittance measured at any number of arbitrarily specified points within the region to be measured.

[0050] As used in this article to indicate a specific numerical range, "X to Y" means "greater than or equal to X and less than or equal to Y (X ≤ and ≤ Y)".

[0051] The polarizing plate according to the invention can be applied to optical display devices in which an image sensor (e.g., a camera) is disposed in an image display area. The polarizing plate according to the invention allows for efficient execution of image display functions by minimizing the visual observation of an external image sensor when the image sensor is not in use, thereby suppressing the visual observation of the external image sensor. The polarizing plate according to the invention can increase the resolution of images (e.g., pictures or videos) provided by an image sensor when the image sensor is used. Furthermore, the polarizing plate according to the invention exhibits good durability in the first area under high temperature or high temperature / high humidity conditions. Moreover, regardless of the formation of the first and second areas, the polarizing plate according to the invention has an anti-reflective function for use as an anti-reflective polarizing plate in light-emitting diode displays (e.g., organic light-emitting diode display devices) with a light-emitting display panel. The first and second areas will be described in detail below.

[0052] The polarizing plate according to one embodiment of the present invention will be described in detail below.

[0053] The polarizing plate includes a first region and a second region in the image display area.

[0054] Here, "image display area" refers to the area on an optical display device employing a polarizing plate that displays an image. The image display area can occupy 90% to 100% of the polarizing plate, preferably 100%. In one embodiment, the polarizing plate may not include a non-image display area. Here, "non-image display area" refers to an area formed around the image display area to prevent the bezel, electrodes, etc., from being observed through a light-shielding layer, etc.

[0055] The first and second regions have different total transmittances at the same wavelength. Unlike the second region, the first region can perform an external image-photographing function via an image sensor (such as a camera), while both the first and second regions perform image display functions.

[0056] The first region has a total transmittance of 45% to 85%. Within this range, the first region can fully realize image display function by suppressing visual observation by an external image sensor when no image sensor is used, while improving image resolution by the image sensor when an image sensor is used. Preferably, the first region has a total transmittance of 50% to 85%, 50% to 70%, or 50% to 60%.

[0057] Utilizing the above light transmittance, the first region according to the present invention can achieve all the aforementioned effects in the laminate of the image sensor, the display panel containing light-emitting diodes, and the polarizing plate in the optical display device. The display panel containing light-emitting diodes and the image sensor are sequentially disposed below the first region, thereby the polarizing plate according to the present invention can simultaneously perform image display and external image capture functions. An optical display device according to one embodiment of the present invention will be described in detail below.

[0058] The second region performs only image display functions and is unrelated to the image capture function implemented by the image sensor in the optical display device. Therefore, the second region has a lower light transmittance than the first region.

[0059] In one embodiment, the difference in total transmittance between the first region and the second region can be in the range of 5% to 45%, specifically, the difference is 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or 45%, more specifically, 5% to 41% or 5% to 20%. Within this range, an optical display device including a polarizing plate can achieve a uniform image across the entire screen by reducing the image difference between the first region where a camera is located and the second region where no camera is located, while preventing the camera from being observed externally.

[0060] The second region can have a total transmittance of 40% to less than 50%, specifically 40% to 45%. Within this range, the second region can effectively achieve image display functionality.

[0061] Although the first region and the second region can have the same polarization, considering the process for forming the first region described below, it is desirable for the first region to have a lower polarization than the second region.

[0062] In one embodiment, the first region may have a polarization of 5% to 85%, specifically 50% to about 75%. Within this range, the first region does not impede the camera's recognition of objects. In one embodiment, the second region may have a polarization of about 90% or greater, specifically about 90% to 100%. Within this range, the second region can provide an anti-reflective effect relative to external light.

[0063] According to the present invention, the maximum absorbance of a first region within a specific wavelength range is controlled within a specific range to achieve image display functionality by suppressing visual observation by an external image sensor when no image sensor is used, while simultaneously improving image resolution and durability of the first region under high temperature or high temperature / high humidity conditions when an image sensor is used. Here, "durability" refers to the low rate of change in total transmittance and / or polarization of the first region when the polarizing plate according to the present invention is placed at high temperature or under high temperature / high humidity conditions for an extended period of time.

[0064] In one embodiment, as calculated by Equation 1, the first region of the polarizing plate may have a total transmittance variation rate of 10% or less, specifically 5% or less, for example, 0% to 5%. Within this range, the first region can exhibit good durability to improve the reliability of the optical display device.

[0065] [Equation 1]

[0066] Total transmittance change rate = (TS1-TS2) / TS1 x100

[0067] (In equation 1,

[0068] TS1 is the total transmittance (in %) of the first region at a wavelength of 550 nm, and

[0069] TS2 is the total transmittance (in %) of the first region at a wavelength of 550 nm after the polarizer has been placed at 85°C for 120 hours or at 85°C and 85% RH for 120 hours.

[0070] In one embodiment, as calculated by Equation 2, the first region of the polarizer has a polarization rate of 20% or less, specifically 10% or less, for example, 0% to 10%. Within this range, the first region can exhibit good durability to improve the reliability of the optical display device.

[0071] [Equation 2]

[0072] Polarization rate of change = (PD2 - PD1) / PD1 x 100

[0073] (In equation 2,

[0074] PD1 is the polarization (in %) of the first region at a wavelength of 550 nm, and

[0075] PD2 is the polarization (in %) of the first region at a wavelength of 550 nm after the polarizer has been placed at 85°C for 120 hours or at 85°C and 85%RH for 120 hours.

[0076] The first region has a total transmittance of 45% to 85%, and the first region has a maximum absorbance of 1.0 to 5.0 in the wavelength range of about 270 nm to about 325 nm, a maximum absorbance of 0.5 to 4.0 in the wavelength range of greater than about 325 nm to about 420 nm, and a maximum absorbance of 0.5 or less in the wavelength range of about 500 nm to about 800 nm. Using this configuration, when applied to… Figure 4 In the optical display device shown, the polarizing plate can effectively achieve image display function by suppressing visual observation by an external image sensor when no image sensor is used, while improving image resolution by the image sensor when an image sensor is used. Furthermore, the first region can have improved durability at high temperatures or under high temperature / high humidity conditions.

[0077] refer to Figure 1 and Figure 2 The polarizing plate according to the present invention will be described in more detail below.

[0078] exist Figure 1 and Figure 2 In the diagram, the solid line (―) represents the first region of a polarizer (or polarizing plate) according to an embodiment of the present invention, the dashed line (----) represents a polarizer that includes only the second region and not the first region, and the dotted line (―--―) represents the region of the polarizer irradiated by a femtosecond laser beam.

[0079] Reference Figure 1A polarizing plate that includes only the second region but not the first region (----) has a maximum absorbance of 0 to 1 at wavelengths from 270 nm to 800 nm, indicating a low maximum absorbance across the entire wavelength range. A typical polarizing plate that includes a region (―--―) formed by irradiation with a femtosecond laser beam to have a high total transmittance in the art has a lower maximum absorbance across the entire wavelength range from 270 nm to 800 nm compared to a polarizing plate that includes only the second region but not the first region (----).

[0080] Conversely, the first region (―) of the polarizing plate according to the embodiment has a lower maximum absorbance at a wavelength of 420 nm or greater compared to the polarizing plate (----) which includes only the second region but not the first region, and the first region (―) of the polarizing plate according to the embodiment has substantially the same absorbance as the region irradiated by the femtosecond laser beam.

[0081] However, the first region of the polarizing plate according to the embodiment has a higher maximum absorbance over the entire wavelength range of 270 nm to 420 nm compared to the polarizing plate that only includes the second region but not the first region (----) and the region irradiated by the femtosecond laser beam (―--―).

[0082] Specifically, the first region of the polarizing plate according to the present invention has two absorption peaks that exhibit maximum absorbance over the entire wavelength range from about 270 nm to about 420 nm, namely, a first absorption peak in the wavelength range from about 270 nm to about 325 nm and a second absorption peak in the wavelength range greater than about 325 nm to about 420 nm. The first region also exhibits maximum absorbance within the specific ranges described above, both in the wavelength range of about 270 nm to about 325 nm and in the wavelength range greater than about 325 nm to about 420 nm. Compared to polarizing plates in the art formed by completely decomposing iodine through irradiation with a femtosecond laser beam to achieve a substantial improvement in total transmittance, the first region of the polarizing plate according to the present invention exhibits the aforementioned wavelength-to-absorbance relationship, thereby achieving the aforementioned effects of the present invention.

[0083] In one embodiment, the first region of the polarizer according to the invention may have a maximum absorbance of 1.0 to 5.0 in the wavelength range of about 270 nm to about 325 nm, for example, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, specifically greater than 1.0 to 5.0, 1.5 to 5.0, 1.5 to 4.5, 1.5 to 3.0, 1.5 to 2.5, or 1.5 to 2.0. Within this range, the first region may further improve the effects of the invention. The first region may exhibit a maximum absorbance at a wavelength of about 295 nm in the wavelength range of about 270 nm to about 325 nm.

[0084] In one embodiment, within a wavelength range greater than about 325 nm to about 420 nm, the first region of the polarizer according to the invention may have a maximum absorbance of 0.5 to 4.0, for example, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, specifically greater than 0.5 to 4.0, 1.0 to 4.0, 1.0 to 3.0, 1.0 to 2.0, or 1.0 to 1.5. Within this range, the first region can further improve the effects of the invention. More preferably, the first region has a maximum absorbance at a wavelength of about 355 nm within the wavelength range greater than about 325 nm to about 420 nm.

[0085] In one embodiment, the first region of the polarizer according to the invention may have an absorbance in the wavelength range of about 270 nm to about 325 nm that is higher than the maximum absorbance in the wavelength range of about 325 nm to about 420 nm. With this configuration, the first region can further improve the effects of the invention.

[0086] In one embodiment, in the first region of the polarizer, the ratio of the maximum absorbance in the wavelength range of about 270 nm to about 325 nm to the maximum absorbance in the wavelength range of greater than about 325 nm to about 420 nm can be in the range of greater than 1 to 5, for example, the ratio is 1.1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 or 5, specifically 1.1 to 5.0 or 1.1 to 2.0. Within this range, the effects of the invention can be achieved more effectively.

[0087] In one embodiment, the first region of the polarizer may have a maximum absorbance of 0.5 or less in the wavelength range of about 500 nm to about 800 nm, for example, 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0 to 0.5, 0.1 to 0.5, or 0.15 to 0.5. Within this range, the effects of the invention can be achieved more effectively.

[0088] It can be done Figure 2 To understand the effects of the invention achieved through the first region according to the invention.

[0089] refer to Figure 2 The polarizing plate according to the invention has a lower total transmittance in the wavelength range of about 300 nm to about 400 nm compared with polarizing plates formed by irradiating iodine with a femtosecond laser beam to achieve a substantial improvement in total transmittance and / or polarizing plates that include only a second region and not a first region.

[0090] Thus, compared to a polarizing plate (―――) that suffers from reduced crystallinity of polyvinyl alcohol film or polarizer due to the high energy of the laser beam, but whose total transmittance is substantially improved by completely decomposing iodine through irradiation with a femtosecond laser beam, the polarizing plate according to the present invention has the aforementioned wavelength-to-total transmittance relationship, thereby providing the aforementioned effects of the present invention.

[0091] In one embodiment, a first region of the polarizer has a lower total transmittance than the second region over the entire wavelength range of about 270 nm to about 420 nm, and a higher total transmittance than the second region over the entire wavelength range of greater than about 420 nm to about 800 nm. With this configuration, the first region can further improve the effects of the invention.

[0092] In one embodiment, the first region of the polarizer may have a total transmittance of 15% or less, for example, 0%, 5%, 10%, or 15%, specifically, 0% to 15%, in the wavelength range of about 270 nm to about 325 nm. Within this range, the first region can further improve the effects of the invention. Figure 2 As shown, this feature of the first region distinguishes it from regions formed by irradiation with a femtosecond laser beam in the art, which have a total transmittance greater than 45% in the wavelength range of about 270 nm to about 325 nm. More preferably, the first region exhibits a maximum peak of total transmittance at a wavelength of about 295 nm.

[0093] In one embodiment, the first region of the polarizer may have 25% or less, for example, 0%, 5%, 10%, 15%, 20%, or 25%, in a wavelength range greater than about 325 nm to about 420 nm, specifically, 0% to 25% of total transmittance. Within this range, the first region can further improve the effects of the invention. Figure 2 As shown, this feature of the first region distinguishes it from regions formed by irradiation with a femtosecond laser beam in the art that have a total transmittance of greater than 50% in a wavelength range of greater than about 325 nm to about 420 nm. More preferably, the first region exhibits a maximum peak of total transmittance at a wavelength of 355 nm in the wavelength range of greater than about 325 nm to about 420 nm.

[0094] In one embodiment, the first region of the polarizer may have a total transmittance of 45% or greater in the wavelength range of about 500 nm to about 800 nm, for example, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%, specifically, 45% to 95%. Within this range, the first region may further improve the effects of the invention.

[0095] In the polarizing plate according to the invention, the second region can exhibit the characteristics according to... Figure 1and Figure 2 The absorbance and total transmittance of the dashed line (----) in the figure.

[0096] The second region may have a lower maximum absorbance than the first region in the wavelength range of about 270 nm to about 420 nm and a higher maximum absorbance than the first region in the wavelength range of greater than about 420 nm to about 800 nm.

[0097] In one embodiment, the second region may have a maximum absorbance of 0.5 to 3.0 in the wavelength range of about 270 nm to about 420 nm, for example, 0.5, 1.0, 1.5, 2.0, 2.5, or 3.0, specifically 0.5 to 2.0 or 0.5 to 1.0. In the polarizing plate according to the invention, the first region having the above absorbance can be formed by irradiating the polarizing plate including the second region having the above absorbance with a pulsed UV beam as described below.

[0098] In one embodiment, the second region may have a maximum absorbance of 0 to 0.6 in a wavelength range greater than about 420 nm to about 800 nm, for example, in a wavelength range of about 500 nm to about 800 nm, specifically, a maximum absorbance greater than 0 to 0.6. In the polarizing plate according to the invention, the first region having the above absorbance can be formed by irradiating the polarizing plate including the second region having the above absorbance with a pulsed UV beam as described below.

[0099] A polarizing plate includes a polarizer and a protective layer formed on at least one surface of the polarizer. In one embodiment, the polarizing plate includes a polarizer and protective films formed on opposite surfaces of the polarizer. In another embodiment, the polarizing plate may include a polarizer and a protective film formed only on one surface of the polarizer.

[0100] Reference Figure 3 A polarizing plate according to the present invention is described.

[0101] refer to Figure 3 The polarizing plate (A) may include a polarizer (1), a first protective layer (2) formed on the light emitting surface of the polarizer (1), and a second protective layer (3) formed on the light incident surface of the polarizer. Alternatively, the polarizing plate (B) may include a polarizer (1) and a first protective layer (2) formed only on the light emitting surface of the polarizer (1). Alternatively, the polarizing plate (C) may include a polarizer (1) and a second protective layer (3) formed only on the light incident surface of the polarizer (1).

[0102] Next, refer to Figure 4 A polarizing plate according to one embodiment of the present invention is described. Figure 4This is a cross-sectional view of an optical display device including a polarizing plate according to the present invention.

[0103] Reference Figure 4 The polarizing plate (100) includes a first region (110) and a second region (120).

[0104] The first region (110) and the second region (120) of the polarizing plate (100) are disposed together between the display panel (150) and the cover glass (200). The display panel (150) includes light-emitting diodes (152) on a base layer (151) to display images. Therefore, the first region (110) and the second region (120) are included in the image display area.

[0105] The optical display device is equipped with an image sensor (250), which is disposed below the display panel (150) and corresponds to the first region (110). Therefore, the first region (110) can achieve image display function by suppressing visual observation by an external image sensor when the image sensor (250) is not used, and improve image resolution by using the image capture function of the image sensor (250) when the image sensor (250) is used. In the laminate of the image sensor (250), the display panel (150) containing light-emitting diodes, and the polarizing plate (100) in the optical display device, the first region (110) can achieve all the above-mentioned effects.

[0106] In the polarizing plate, preferably, in the overall area of ​​the first region (110) and the second region (120), the first region (110) may occupy 10% or less, specifically, an area ratio greater than 0% to 10%. Within this range, the first region can provide image sensor functionality.

[0107] The first region (110) may have a circular, elliptical, angled or amorphous shape, but is not limited thereto.

[0108] In the polarizing plate, the first region (110) can be placed anywhere without restriction and can be positioned to correspond to the position of the image sensor (250) in the optical display device.

[0109] Next, a method for manufacturing a polarizing plate comprising a first region (110) and a second region (120) according to an embodiment of the present invention will be described.

[0110] The polarizing plate according to the present invention can be manufactured by preparing a laminate of a polarizer (without the first and second regions formed) and a protective layer (without the first and second regions formed) formed on at least one surface of the polarizer, and then irradiating a predetermined area of ​​the laminate with a pulsed UV laser beam at a wavelength of about 200 nm to about 1000 nm to form the first region. The area of ​​the laminate not irradiated with the pulsed UV laser beam becomes the second region. Irradiation with a pulsed UV laser beam at a wavelength of about 200 nm to about 1000 nm can form the aforementioned first region.

[0111] When processed with the same pulsed UV energy, a polarizer without an upper protective layer allows for the formation of locally high-transmittance holes with 3% to 5% higher transmittance than a polarizer with an upper protective layer. This result is assumed to be due to reduced pulsed UV energy loss on the upper protective layer, providing better processability. Furthermore, the polarizer without an upper protective layer suffers from deterioration in processing accuracy in the final polarizer due to refraction of the pulsed UV light after passing through the mask and the upper protective layer. Processing accuracy can be further improved when processing with a mask placed directly on the polarizer without an upper protective layer.

[0112] The polarizer (without the first and second regions formed) comprises a polyvinyl alcohol film dyed and stretched with iodine and / or dichroic dyes. The polarizer (without the first and second regions formed) can have a thickness of about 3 μm to about 50 μm, specifically, about 3 μm to about 30 μm. Within this range, the polarizer can be used in a polarizing plate.

[0113] The polarizer (without the first and second regions formed) can be manufactured by typical methods known to those skilled in the art.

[0114] First, dyed and stretched polyvinyl alcohol films are manufactured.

[0115] A dyed and stretched polyvinyl alcohol (PVA) film can be manufactured through dyeing, stretching, crosslinking, and color correction processes. In the method for manufacturing a polarizer according to the invention, dyeing and stretching can be performed in any order. That is, the PVA film can be dyed and then stretched, or vice versa, or it can be subjected to dyeing and stretching simultaneously.

[0116] The polyvinyl alcohol film can be a typical polyvinyl alcohol film used in the manufacture of typical polarizers. Specifically, the polyvinyl alcohol film can be a film produced from polyvinyl alcohol or its derivatives. The polyvinyl alcohol film can have a degree of polymerization of about 1,000 to about 5,000, a degree of saponification of about 80 mol% to about 100 mol%, and a thickness of about 1 μm to about 30 μm, specifically, about 3 μm to about 30 μm. Within this range, the polyvinyl alcohol film can be used to manufacture thin polarizers.

[0117] Polyvinyl alcohol (PVA) films can be subjected to washing and swelling with water prior to dyeing and stretching. Washing with water removes foreign matter from the surface of the PVA film. Swelling allows for more efficient dyeing or stretching. As is known to those skilled in the art, swelling can be achieved by immersing the PVA film in an aqueous swelling bath. The temperature and swelling time of the swelling bath are not particularly limited. The swelling bath may further include boric acid, inorganic acids, surfactants, etc., and the content of these components can be adjusted.

[0118] Polyvinyl alcohol (PVA) films can be dyed by immersing them in a dyeing bath containing iodine and / or a dichroic dye. During the dyeing process, the PVA film is immersed in a dyeing solution, which can be an aqueous solution containing iodine and / or a dichroic dye. Specifically, the iodine is provided in the form of an iodine-based dye. Iodine-based dyes can include at least one selected from potassium iodide, hydrogen iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, and copper iodide. The dyeing solution can be an aqueous solution containing about 1 wt% to about 5 wt% iodine and / or a dichroic dye. Within this range, the polarizer has a polarization degree within a predetermined range for use in a display device.

[0119] The dyeing bath can have a temperature of about 20°C to about 45°C, and the polyvinyl alcohol film can be immersed in the dyeing bath for about 10 seconds to about 300 seconds. Within this range, polarizers with high polarization can be achieved.

[0120] Dyed polyvinyl alcohol films can be stretched in a stretching bath to display polarization by the orientation of iodine and / or dichroic dyes. Specifically, stretching can be achieved by dry stretching and wet stretching. Dry stretching can be performed by inter-roll stretching, compression stretching, hot roll stretching, etc., while wet stretching can be performed in an aqueous wet stretching bath at about 35°C to about 65°C. The wet stretching bath may further contain boric acid to improve the stretching effect.

[0121] Polyvinyl alcohol (PVA) films can be stretched at a specific stretch ratio, specifically, a total stretch ratio of approximately 5 to approximately 7 times, and more specifically, approximately 5.5 to approximately 6.5 times. Within this range, the PVA film can prevent cutting, wrinkling, etc., during stretching, and can achieve polarizers with improved polarization and transmittance. Stretching can be performed through uniaxial stretching in single-stage or multi-stage (e.g., bi-stage and tri-stage stretching) manner, thereby preventing breakage of the PVA film during the manufacture of thin polarizers.

[0122] Although the dyeing and stretching of the polyvinyl alcohol film are performed in the order described above in the above embodiments, the dyeing and stretching can be carried out in the same reaction bath.

[0123] Before or after stretch-dyed polyvinyl alcohol (PVA) films, the PVA films can undergo crosslinking in a crosslinking bath. Crosslinking is a process that allows the PVA films to be more strongly dyed with iodine and / or dichroic dyes, and boric acid can be used as a crosslinking agent. To enhance the crosslinking effect, the crosslinking bath may further contain phosphoric acid compounds, potassium iodide, etc.

[0124] Dyed and stretched polyvinyl alcohol (PVA) films can undergo color correction in a color correction bath. In color correction, the dyed and stretched PVA film is immersed in a color correction bath filled with a potassium iodide-containing color correction solution. As a result, the polarizer exhibits a reduced color value and iodine anions (I-) are removed from the polarizer. - This improves durability. The color correction bath can have a temperature of about 20°C to about 45°C, and the polyvinyl alcohol film can be immersed in the color correction bath for about 10 seconds to about 300 seconds.

[0125] Next, the laminate is manufactured by forming a protective layer on at least one surface of the dyed and stretched polyvinyl alcohol film. The protective layer can be manufactured by typical methods known to those skilled in the art.

[0126] The protective layer is formed on at least one surface of the polarizer and may be a photocurable coating or a protective film.

[0127] Photocurable coatings may include a cured layer formed from a composition containing a photocurable compound or a liquid crystal layer formed from a liquid crystal polymer.

[0128] The protective film can be a typical protective film used as a protective film for polarizers. For example, the protective film may include a protective film formed from at least one resin selected from: cellulose resins including triacetyl cellulose; polyester resins including polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, etc.; cyclic polyolefin resins; polycarbonate resins; polyethersulfone resins; polysulfone resins; polyamide resins; polyimide resins; polyolefin resins; polyarylate resins; polyvinyl alcohol resins; polyvinyl chloride resins; and polyvinylidene chloride resins. The protective film may have a thickness of about 10 μm to about 100 μm, for example, about 10 μm to about 60 μm. Lamination can be performed using adhesives by typical methods known to those skilled in the art.

[0129] The protective layer may include at least one of a delayed film, a delayed layer, a non-delayed film, and a non-delayed layer.

[0130] Subsequently, the first region is formed by irradiating a predetermined region of the laminate with a pulsed UV laser beam at a wavelength of about 200 nm to about 1000 nm.

[0131] A pulsed UV laser beam in the wavelength range of about 200 nm to about 1000 nm decomposes iodine and dichroic dyes in a polarizer by transferring iodine and dichroic dyes from the ground state to the excited state, thereby forming a first region in the area irradiated by it.

[0132] However, even after irradiation with a pulsed UV laser beam in the wavelength range of about 200 nm to about 1000 nm, dichroic substances (such as iodine and dichroic dyes) are present in the region of the polarizer corresponding to the first region.

[0133] Specifically, irradiation can be performed using a pulsed laser beam in the wavelength range of about 200 nm to about 1000 nm, preferably about 200 nm to about 800 nm.

[0134] Pulsed laser beams in the wavelength range of approximately 200 nm to approximately 1000 nm can be emitted at voltages of approximately 200 V to approximately 750 V. Pulsed laser beams in the wavelength range of approximately 200 nm to approximately 1000 nm can be emitted with pulse periods (irradiation time of one irradiation) of approximately 300 μs to approximately 600 μs. Pulsed laser beams in the wavelength range of approximately 200 nm to approximately 1000 nm can emit at voltages of approximately 2.0 J / cm². 2 Approximately 5.0 J / cm 2 The energy density of the emitted light is high. A pulsed laser beam in the wavelength range of approximately 200 nm to approximately 1000 nm can achieve an emission rate of approximately 2 kW / cm² during a single irradiation. 2 Approximately 30kw / cm 2 The laser intensity is irradiated. Within this range, the first region can achieve a light transmittance of approximately 45% to approximately 85% without carbonizing the processed surface of the polarizer by heating. "Irradiation energy density" refers to the irradiation energy per pulse per unit area in a region of the polarizer with high light transmittance (such as the second region).

[0135] In one embodiment, irradiation with a pulsed laser beam in the wavelength range of about 200 nm to about 1000 nm, with a pulse period of about 460 μs, can be performed for about 1 second to about 400 seconds, for example, about 1 second to about 40 seconds. Within this range, a neutral colorless region with high transmittance can be formed under the above conditions by increasing the irradiation time or the number of irradiations without causing thermal deformation of the polarizer and protective film.

[0136] Irradiation with a pulsed laser beam in the wavelength range of approximately 200 nm to approximately 1000 nm can be performed 1 to 20 times. Within this range, a neutral colorless region with high transmittance can be formed under the above conditions by increasing the irradiation time or the number of irradiations without causing thermal deformation of the polarizer and protective film.

[0137] A pulsed UV beam can be emitted using a xenon flash lamp. Specifically, when a polarizer (without the first and second regions formed) is placed on a ceramic substrate, a mask having a region of the polarizer (without the first and second regions formed) other than the first region, i.e., a mask formed in the second region (e.g., by forming a ceramic material or a photomask Cr), is positioned on the polarizer, and then the mask is irradiated with a pulsed UV beam to form the first region. Typically, mask materials with low reflectivity and low thermal conductivity are known in the art.

[0138] The polarizer having the first and second regions can have a thickness of about 3 μm to about 50 μm, specifically about 3 μm to about 30 μm. Within this range, the polarizer can be used in a polarizing plate.

[0139] Next, a polarizing plate according to another embodiment of the present invention will be described.

[0140] The polarizing plate according to this embodiment includes a polarizer and a protective layer formed on at least one surface of the polarizer, wherein the polarizer includes a first region and a second region in the image display region, the first region and the second region having different total transmittances at the same wavelength, the first region having a total transmittance of 45% to 85%, and the first region having a maximum absorbance of 1.0 to 5.0 in the wavelength range of about 270 nm to about 325 nm, a maximum absorbance of 0.5 to 4.0 in the wavelength range of greater than about 325 nm to about 420 nm, and a maximum absorbance of 0.5 or less in the wavelength range of about 500 nm to about 800 nm.

[0141] Except that the first region formed in the polarizer and the second region formed in the polarizer have substantially the same characteristics as the first region and the second region formed in the polarizer according to the above embodiment, the polarizer according to this embodiment is substantially the same as the polarizer according to the above embodiment.

[0142] Next, an optical display device according to an embodiment of the present invention will be described.

[0143] The optical display device according to the present invention includes a polarizing plate according to the present invention. The optical display device may include an organic light-emitting diode display, a liquid crystal display, etc., preferably an organic light-emitting diode display.

[0144] Reference Figure 4 The optical display device according to the present invention will be described in more detail.

[0145] Reference Figure 4The optical display device includes: a display panel (150) comprising a substrate (151) and light-emitting diodes (152), a polarizing plate (100) formed on the display panel (150), a cover glass (200) formed on the polarizing plate (100), and an image sensor (250) disposed below the display panel (150). The display panel (150) does not have a through-hole into which the image sensor (250) is inserted.

[0146] The polarizing plate (100) includes a first region (110) and a second region (120). The polarizing plate includes the polarizing plate according to the present invention. Both the first region (110) and the second region (120) constitute the image display area of ​​the optical display device. The polarizing plate (100) does not have a through hole into which an image sensor (250) is inserted.

[0147] The first region (110) has fewer light-emitting diodes (151) arranged densely than the second region (120). With this structure, the first region can realize the image display function through the image sensor (250) and the display function through the display panel (150).

[0148] An image sensor (250) is disposed below the first region (110). The image sensor (250) may include, but is not limited to, a camera.

[0149] Invention Model

[0150] The invention will now be described in more detail with reference to some embodiments. However, it should be noted that these embodiments are provided for illustrative purposes only and should not be construed as limiting the invention in any way.

[0151] The components used in the examples and comparative examples are described in detail below.

[0152] (1) Polarizing film material: polyvinyl alcohol based film (VF-PE3000, thickness: 30μm, Kuraray Co., Ltd., Japan)

[0153] (2) Protective film: Triacetyl cellulose membrane (KC4UYW, thickness: 40μm, Konica Co., Ltd., Japan)

[0154] Example 1

[0155] Polyvinyl alcohol films washed with water were subjected to swelling treatment at 30°C in a water-filled swelling bath.

[0156] After swelling treatment, the polyvinyl alcohol (PVA) film was dyed in a dyeing bath at 30°C with an aqueous solution containing 3 wt% potassium iodide for 30 to 200 seconds. The dyed PVA film was then passed through a wet crosslinking bath filled with an aqueous solution containing 3 wt% boric acid at 30 to 60°C. Subsequently, the PVA film was stretched in an aqueous solution containing 3 wt% boric acid at 50 to 60°C to achieve a total stretch ratio of 6 times its initial length, thereby producing a polarizer. A laminate was prepared by bonding a protective film to both surfaces of the prepared polarizer using an adhesive (Z-200, Nippon Goshei Co., Ltd.).

[0157] The laminate is cut to a predetermined size, and under the conditions listed in Table 1, a target area of ​​the laminate is irradiated only with a pulsed UV beam at wavelengths between 200 nm and 800 nm to create a polarizing plate with a first region. The area of ​​the polarizing plate not irradiated with the pulsed UV beam becomes the second region.

[0158] Examples 2 to 4

[0159] Except for changing the conditions of irradiation with pulsed UV beams, each polarizing plate having a first region and a second region is manufactured in the same manner as in Example 1, as listed in Table 1.

[0160] Example 5

[0161] Except that the protective film is only bonded to the upper surface of the polarizer, the polarizer plate having the first region and the second region is manufactured in the same manner as in Example 1.

[0162] Comparative Example 1

[0163] The polarizing plate is manufactured in the same manner as in Example 1, except that it is not irradiated with a pulsed UV beam. The polarizing plate includes only the second region and excludes the first region.

[0164] Comparative Example 2

[0165] Except for the area of ​​the polarizer irradiated with a pulsed UV beam in Example 1, which was irradiated with a femtosecond laser beam with a wavelength of 515 nm at a speed of 0.17 J / (cm²),... 2 The polarizing plate is manufactured in the same manner as in Example 1, except for irradiation with a pulse intensity of 0.5 seconds (instead of a pulsed UV beam).

[0166] The following properties of the polarizing plates manufactured in the examples and comparative examples were evaluated, and the evaluation results are shown in Table 1 and... Figure 1 and Figure 2 middle.

[0167] (1) Absorbance of the first and second regions (unit: no unit): Absorbance was measured at wavelengths from 200 nm to 800 nm in each first and second region of each polarizer fabricated in the examples and comparative examples using a UV-Vis spectrophotometer V730 (JASCO).

[0168] (2) Total transmittance of the first and second regions (unit: %): The total transmittance was measured at wavelengths from 200 nm to 800 nm on each first and second region of each polarizer fabricated in the examples and comparative examples using a UV-Vis spectrophotometer V730 (JASCO).

[0169] (3) Camera visual observation and camera image resolution: Using a camera positioned below the first region of each polarizer, the camera's visual observation and the resulting image are observed above the polarizer. A polarizer that provides a difference in polarization between the first and second regions without visual observation through the camera lens, while providing a high-resolution image through the camera, is rated ◎; a polarizer that allows slight observation through the camera lens but is not observed externally through the camera, while providing a high-resolution image through the camera, is rated ○; a polarizer that provides a large amount of observation through the camera lens, while providing a high-resolution image through the camera, is rated △; a polarizer that does not provide a difference between the first and second regions, and provides a differential resolution image through the camera, is rated x.

[0170] (4) Durability: Each polarizing plate manufactured in the examples and comparative examples was cut into square samples with dimensions of MD x TD (10cm x 10cm) of the polarizer. The sample was a polarizing plate including a first region. In the sample, the total transmittance in the first region was measured at a wavelength of 550nm. Subsequently, the sample was placed at 85°C for 120 hours, and the total transmittance was measured at 550nm in the same manner. The rate of change of total transmittance was calculated according to Equation 1.

[0171] (5) Reflectance (unit: %): The camera is placed below the area of ​​the polarizing plate corresponding to the first region. The reflectance of each first and second region is measured. The reflectance is measured using a colorimeter via the SCI method.

[0172] [Table 1]

[0173]

[0174]

[0175] *In Table 1, the numbers in the form of () represent the maximum absorbance at the corresponding wavelength.

[0176] As shown in Table 1, when applied to optical display devices, the polarizer according to the present invention can suppress visual observation by image sensors (such as cameras), while improving image resolution and ensuring good durability when using image sensors. Although not shown in Table 1, the polarizer according to the present invention has substantially the same absorbance and total transmittance as those listed in Table 1.

[0177] Conversely, in Comparative Example 1, the polarizer without the first region provides a poor image through the camera. In Comparative Example 2, the polarizer with the first region formed by irradiation with a femtosecond laser beam allows for severe viewing by the camera lens, thus preventing image display.

[0178] It should be understood that various modifications, alterations, modifications, and equivalent implementations can be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. A polarizing plate, comprising a polarizer and a protective layer formed on at least one surface of the polarizer, the polarizing plate including a first region and a second region in an image display area. in, The first region and the second region have different total transmittances at the same wavelength; and The first region has a total transmittance of 45% to 85%, and the first region has a maximum absorbance of 1.0 to 5.0 in the wavelength range of 270 nm to 325 nm, a maximum absorbance of 0.5 to 4.0 in the wavelength range of greater than 325 nm and less than or equal to 420 nm, and a maximum absorbance of 0.5 or less in the wavelength range of 500 nm to 800 nm. The second region has a lower maximum absorbance than the first region in the wavelength range of 270 nm to 420 nm, and the second region has a higher maximum absorbance than the first region in the wavelength range of greater than 420 nm and less than or equal to 800 nm.

2. A polarizing plate, comprising a polarizer and a protective layer formed on at least one surface of the polarizer, in, The polarizer includes a first region and a second region in the image display area. The first region and the second region have different total transmittances at the same wavelength; and The first region has a total transmittance of 45% to 85%, and the first region has a maximum absorbance of 1.0 to 5.0 in the wavelength range of 270 nm to 325 nm, a maximum absorbance of 0.5 to 4.0 in the wavelength range of greater than 325 nm and less than or equal to 420 nm, and a maximum absorbance of 0.5 or less in the wavelength range of 500 nm to 800 nm. The second region has a lower maximum absorbance than the first region in the wavelength range of 270 nm to 420 nm, and the second region has a higher maximum absorbance than the first region in the wavelength range of greater than 420 nm and less than or equal to 800 nm.

3. The polarizing plate according to claim 1 or 2, wherein, The first region has a maximum absorbance of greater than 1.0 and less than or equal to 5.0 in the wavelength range of 270 nm to 325 nm and a maximum absorbance of greater than 0.5 and less than or equal to 4.0 in the wavelength range of greater than 325 nm and less than or equal to 420 nm.

4. The polarizing plate according to claim 1 or 2, wherein, In the first region, the maximum absorbance in the wavelength range of 270 nm to 325 nm is higher than the maximum absorbance in the wavelength range greater than 325 nm and less than or equal to 420 nm.

5. The polarizing plate according to claim 1 or 2, wherein, The second region has a maximum absorbance of 0.5 to 3.0 in the wavelength range of 270 nm to 420 nm and a maximum absorbance of 0 to 0.6 in the wavelength range of greater than 420 nm and less than or equal to 800 nm.

6. The polarizing plate according to claim 1 or 2, wherein, The difference in total transmittance between the first region and the second region is in the range of 5% to 45%.

7. The polarizing plate according to claim 1 or 2, wherein, The first region has a lower total transmittance than the second region in the wavelength range of 270 nm to 420 nm, and the first region has a higher total transmittance than the second region in the wavelength range of greater than 420 nm and less than or equal to 800 nm.

8. The polarizing plate according to claim 1 or 2, wherein, The first region has a total transmittance of 15% or less in the wavelength range of 270 nm to 325 nm, a total transmittance of 25% or less in the wavelength range of greater than 325 nm and less than or equal to 420 nm, and a total transmittance of 45% or greater in the wavelength range of 500 nm to 800 nm.

9. A polarizing plate, comprising a polarizer and a protective layer formed on at least one surface of the polarizer. The polarizing plate includes a first region and a second region in the image display area. in, The first region and the second region have different total transmittances at the same wavelength; and The first region has a total transmittance variation rate of 10% or less, calculated by Equation 1: [Equation 1] Total transmittance change rate = (TS1 - TS2) / TS1 x 100 In equation 1, TS1 is the total transmittance of the first region at a wavelength of 550 nm, in %. TS2 is the total transmittance of the first region at a wavelength of 550 nm after the polarizer is placed at 85°C for 120 hours or at 85°C and 85% relative humidity for 120 hours, in %; The first region has a total transmittance of 45% to 85%, wherein the first region has a maximum absorbance of 1.0 to 5.0 in the wavelength range of 270 nm to 325 nm, a maximum absorbance of 0.5 to 4.0 in the wavelength range of greater than 325 nm and less than or equal to 420 nm, and a maximum absorbance of 0.5 or less in the wavelength range of 500 nm to 800 nm; The second region has a maximum absorbance of 0.5 to 3.0 in the wavelength range of 270 nm to 420 nm and a maximum absorbance of 0 to 0.6 in the wavelength range of greater than 420 nm and less than or equal to 800 nm.

10. The polarizing plate according to claim 9, wherein, The first region has a maximum absorbance of greater than 1.0 and less than or equal to 5.0 in the wavelength range of 270 nm to 325 nm and a maximum absorbance of greater than 0.5 and less than or equal to 4.0 in the wavelength range of greater than 325 nm and less than or equal to 420 nm.

11. An optical display device comprising a polarizing plate according to any one of claims 1 to 10.

12. The optical display device according to claim 11, comprising: Display panel; The polarizing plate formed on the upper surface of the display panel; An image sensor is formed below the display panel, and the image sensor is disposed below the first region of the polarizing plate.

Images