Cutting method of polaroid for OLED display panel

Abstract

The invention relates to the technical field of laser cutting, in particular to a cutting method of a polaroid for an OLED display panel, and aims to solve the technical problem that microcracks are generated after a circular polaroid of a liquid crystal phase difference layer structure is cut through an existing laser cutting method. In order to achieve the purpose, the cutting method of the polaroid for the OLED display panel comprises the steps that the polaroid is attached to the light emitting side of the OLED display panel, and the polaroid sequentially comprises a liquid crystal phase difference film and a linear polarization layer in the light emitting direction of the OLED display panel; and irradiating the to-be-cut area of the polaroid with laser, wherein the polarization direction of the laser deviates from the first angle range of the optical axis of the liquid crystal phase difference film. By controlling the polarization direction of the laser, efficient and accurate cutting of the polaroid is achieved, and the problem of cracking of the liquid crystal phase difference film after laser cutting is avoided.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, and specifically provides a method for cutting polarizers for OLED display panels. Background Technology

[0002] Currently, in the OLED display field, most flat and foldable products use circular polarizers (C-POLs). Circular polarizers are divided into two types: those using a liquid crystal retardation layer and those using a stretched film retardation layer. Because the configuration using a liquid crystal retardation layer is thinner and has advantages in reliability and stability, C-POLs using liquid crystal retardation layers are increasingly being used.

[0003] However, cutting the circular polarizer of the liquid crystal phase retardation layer structure using existing laser cutting methods will produce microcracks. The presence of microcracks may damage the integrity of the liquid crystal phase retardation layer, which will directly affect the display effect and stability of the OLED display panel. Summary of the Invention

[0004] To overcome the above-mentioned defects, this application provides a method for cutting polarizers for OLED display panels, which solves or at least partially solves the technical problem that microcracks generated after cutting circular polarizers of liquid crystal phase retardation layer structures by existing laser cutting methods directly affect the display effect and stability of OLED display panels.

[0005] In a first aspect, this application provides a method for cutting a polarizer for an OLED display panel, the method comprising:

[0006] A polarizer is attached to the light-emitting side of an OLED display panel, wherein the polarizer comprises a liquid crystal phase difference film and a linear polarization layer in sequence along the light-emitting direction of the OLED display panel.

[0007] The area to be cut by the polarizer is irradiated with a laser, wherein the polarization direction of the laser deviates from the optical axis of the liquid crystal phase difference film by a first angle range, wherein the first angle range is [-θ1, θ1], and θ1 is greater than 0.

[0008] In one embodiment of this application, the liquid crystal phase retardation film is a 1 / 4 liquid crystal phase retardation film.

[0009] In one embodiment of this application, θ1 = 15°.

[0010] In one embodiment of this application, the angle between the absorption axis of the linearly polarized layer and the optical axis of the liquid crystal retardation film is a first angle, the optical axis of the liquid crystal retardation film forms a second angle with the long side of the OLED display panel, and the polarization direction of the laser is perpendicular to or parallel to the long side of the OLED display panel, wherein neither the first angle nor the second angle is 0.

[0011] In one embodiment of this application, the first included angle is 45° or 135° and the second included angle is 45°.

[0012] In one embodiment of this application, the angle between the absorption axis of the linearly polarized layer and the optical axis of the liquid crystal phase retardation film is a third angle. One of the optical axis of the liquid crystal phase retardation film and the polarization direction of the laser is parallel to the long side of the OLED display panel, and the other of the optical axis of the liquid crystal phase retardation film and the polarization direction of the laser is perpendicular to the long side of the OLED display panel, wherein the third angle is not 0.

[0013] In one embodiment of this application, the third included angle is 45° or 135°.

[0014] In one embodiment of this application, the liquid crystal phase retardation film includes a 1 / 4 liquid crystal phase retardation film and a 1 / 2 liquid crystal phase retardation film in sequence along the light emission direction of the OLED display panel, wherein the polarization direction of the laser deviates from the optical axis of both the 1 / 4 liquid crystal phase retardation film and the 1 / 2 liquid crystal phase retardation film outside the first angle range.

[0015] In one embodiment of this application, θ1 = 15°.

[0016] In one embodiment of this application, the angle between the absorption axis of the linearly polarized layer and the optical axis of the 1 / 2 liquid crystal retardation film is a fourth angle, the angle between the absorption axis of the linearly polarized layer and the optical axis of the 1 / 4 liquid crystal retardation film is a fifth angle, the optical axis of the 1 / 2 liquid crystal retardation film forms a sixth angle with the long side of the OLED display panel, the optical axis of the 1 / 4 liquid crystal retardation film forms a seventh angle with the long side of the OLED display panel, and the polarization direction of the laser is perpendicular to or parallel to the long side of the OLED display panel, wherein the fourth, fifth, sixth, and seventh angles are all non-zero.

[0017] In one embodiment of this application, the fourth included angle is [55°, 85°], the fifth included angle is [5°, 35°], the sixth included angle is [10°, 40°], and the seventh included angle is [-40°, -10°].

[0018] The above-described technical solutions of this application have at least one or more of the following features. Beneficial effects:

[0019] The method for cutting a polarizer for an OLED display panel in this application includes: attaching a polarizer to the light-emitting side of the OLED display panel, wherein the polarizer sequentially comprises a liquid crystal phase retardation film and a linear polarization layer along the light-emitting direction of the OLED display panel; irradiating the area to be cut with a laser, wherein the polarization direction of the laser deviates from the optical axis of the liquid crystal phase retardation film by a first angle range, wherein the first angle range is [-θ1, θ1], and θ1 is greater than 0. By controlling the polarization direction of the laser, efficient and precise cutting of the polarizer is achieved, avoiding the cracking problem of the liquid crystal phase retardation film after laser cutting. Attached Figure Description

[0020] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0021] Figure 1 This is a schematic diagram of the main steps of a method for cutting a polarizer for an OLED display panel in one embodiment of this application;

[0022] Figure 2 This is a schematic diagram showing that the polarization direction of the laser deviates from the optical axis of the 1 / 4 liquid crystal phase difference film in one embodiment of this application;

[0023] Figure 3 , Figure 4 and Figure 5 This is a schematic diagram of the angle between the polarization direction of the laser and the optical axis of the 1 / 4 liquid crystal phase difference film in one embodiment of this application;

[0024] Figure 6 This is a schematic diagram showing the polarization direction of the laser deviating from the optical axis of the 1 / 4 liquid crystal retardation film and the optical axis of the 1 / 2 liquid crystal retardation film in one embodiment of this application;

[0025] Figure 7 This is a schematic diagram showing the angles between the polarization direction of the laser and the optical axes of the 1 / 4 liquid crystal phasor film and the 1 / 2 liquid crystal phasor film, respectively, in one embodiment of this application.

[0026] Figure 8(a) is a scanning electron microscope image of the sample obtained using the polarizer cutting method of this application;

[0027] Figure 8(b) is a scanning electron microscope image of the sample obtained using existing methods. Detailed Implementation

[0028] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0029] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0030] Existing methods using circular polarizers with liquid crystal retardation layers often result in 10-30µm microcracks at the liquid crystal retardation layer location after UV pulsed laser treatment. These microcracks introduce reliability issues and the risk of the circular polarizer cracking during use, particularly prominent in foldable products. The presence of these microcracks can compromise the integrity of the liquid crystal retardation layer, directly impacting the display performance and stability of the OLED display panel.

[0031] Therefore, this application proposes a method for cutting polarizers for OLED display panels.

[0032] See appendix Figure 1 , Figure 1 This is a schematic flowchart of the main steps of a method for cutting a polarizer for an OLED display panel according to an embodiment of this application.

[0033] like Figure 1 As shown, the cutting method for the polarizer of the OLED display panel in this embodiment mainly includes the following steps S101-S102.

[0034] Step S101: Attach the polarizer to the light-emitting side of the OLED display panel, wherein the polarizer includes a liquid crystal phase retardation film and a linear polarization layer in sequence along the light-emitting direction of the OLED display panel.

[0035] Liquid crystal retardation films are used to adjust the phase of light.

[0036] Linear polarization layers are used to generate or filter polarized light in a specific direction.

[0037] Specifically, the polarizer is attached to the light-emitting side of the OLED display panel, that is, the side from which light is emitted. The attachment process must ensure that there are no air bubbles, dust, or other impurities between the polarizer and the OLED panel, and that both surfaces are flat and in close contact. For example, an adhesive can be used for bonding; the adhesive should have good transparency and stability to avoid adverse effects on the display performance.

[0038] Step S102: Irradiate the area to be cut with a laser, wherein the polarization direction of the laser deviates from the optical axis of the liquid crystal phase difference film by a first angle range, wherein the first angle range is [-θ1, θ1], and θ1 is greater than 0.

[0039] In one embodiment, a UV (ultraviolet) pulsed laser may be used as an example of the laser, but is not limited thereto. A UV (ultraviolet) pulsed laser is a laser technology that utilizes the ultraviolet wavelength and is characterized by the release of high-energy pulses in an extremely short time, typically ranging in duration from a few nanoseconds to picoseconds or even femtoseconds.

[0040] Laser cutting is a non-contact processing method with advantages such as high cutting speed, high precision, and small heat-affected zone.

[0041] The area to be cut refers to a specific portion of the polarizer that needs to be removed or separated by laser. The specific location and shape of the area to be cut depend on a variety of factors, including but not limited to the design requirements of the OLED display panel, the size and shape of the polarizer, and the assembly requirements of the final product. These can be adapted to the actual application scenario and are not limited in this respect.

[0042] To avoid the laser polarization direction getting too close to or coinciding with the optical axis of the liquid crystal phase retardation film, which could potentially cause abnormal alignment or damage to the liquid crystal molecules and thus affect the performance of the polarizer, this application defines the laser polarization direction. Specifically, the laser polarization direction deviates from the optical axis of the liquid crystal phase retardation film by a first angular range [-θ1, θ1]. Here, θ1 is an angle value greater than 0, which defines the safe distance range between the laser polarization direction and the optical axis of the liquid crystal phase retardation film. The first angular range is determined through experimental or theoretical analysis to ensure that the laser cutting process does not adversely affect the liquid crystal phase retardation film.

[0043] Based on steps S101-S102 above, a polarizer is attached to the light-emitting side of the OLED display panel. The polarizer, along the light-emitting direction of the OLED display panel, sequentially includes a liquid crystal phase retardation film and a linear polarization layer. A laser is used to irradiate the area to be cut on the polarizer, wherein the polarization direction of the laser deviates from the optical axis of the liquid crystal phase retardation film by a first angle range, where the first angle range is [-θ1, θ1], and θ1 is greater than 0. By controlling the polarization direction of the laser, efficient and precise cutting of the polarizer is achieved, avoiding cracking of the liquid crystal phase retardation film after laser cutting, ensuring that the performance of the liquid crystal phase retardation film is not affected, and maintaining the overall performance of the polarizer; at the same time, it effectively avoids damage to the OLED display panel or the polarizer itself.

[0044] The embodiments of this application are described in detail below. Example 1

[0045] In this embodiment, the cutting method of the polarizer for the OLED display panel of this application will be described in detail using an example of a 1 / 4 liquid crystal phase retardation film as the phase retardation film.

[0046] A quarter-wave liquid crystal retardation film, also known as a quarter-wave plate, is a special optical component commonly used in optical systems to control the polarization state of light. In specific optical configurations, it can convert linearly polarized light into elliptically polarized or circularly polarized light.

[0047] In one specific embodiment of this application, θ1 = 15°.

[0048] Specifically, by setting the laser polarization direction to deviate from the optical axis of the 1 / 4 liquid crystal phasor film by [-15°, 15°], and ensuring the laser polarization direction does not directly point to the optical axis of the 1 / 4 liquid crystal phasor film, the direct interaction between the laser and the liquid crystal molecules is weakened. This reduces laser scattering and reflection within the film, helping the laser beam to be focused more accurately on the area to be cut, improving cutting precision and edge smoothness, thereby ensuring the consistency and stability of the cutting effect. For example, Figure 2 This can serve as an example of the laser's polarization direction deviating from the optical axis of a 1 / 4 liquid crystal phasor film.

[0049] In one embodiment of this application, the angle between the absorption axis of the linearly polarized layer and the optical axis of the liquid crystal phase retardation film is a first angle, the optical axis of the liquid crystal phase retardation film forms a second angle with the long side of the OLED display panel, and the polarization direction of the laser is perpendicular to or parallel to the long side of the OLED display panel, wherein neither the first angle nor the second angle is 0.

[0050] A linear polarizing layer is an optical element that allows light in a specific direction (called the polarization direction) to pass through, while absorbing or reflecting light in a direction perpendicular to it. The absorption axis of a linear polarizing layer typically refers to the direction in the layer that blocks light from passing through, that is, the direction perpendicular to the polarization direction of the light that is allowed to pass.

[0051] The optical axis of a liquid crystal phase retardation film refers to the specific direction in which the liquid crystal molecules inside the film are arranged, and this direction affects the phase change of light as it passes through the film.

[0052] The angle between the absorption axis of the linear polarization layer and the optical axis of the liquid crystal retardation film is not 0, which means that the linear polarization layer and the liquid crystal retardation film have a certain tilt angle to achieve a specific optical effect.

[0053] OLED display panels typically have a rectangular shape, with the longer side referred to as the long side.

[0054] The fact that the angle between the optical axis of the 1 / 4 liquid crystal phase retardation film and the long side of the OLED display panel is not 0 indicates that the liquid crystal phase retardation film and the long side of the OLED display panel have a certain tilt angle.

[0055] By precisely controlling the first angle between the absorption axis of the linearly polarized layer and the optical axis of the quarter-liquid crystal retardation film, and the second angle between the optical axis of the quarter-liquid crystal retardation film and the long side of the OLED display panel, the light transmission path can be optimized, reducing unnecessary reflection, scattering, or absorption of light as it passes through these layers. This improves light utilization efficiency and makes the display brighter. Furthermore, the laser's polarization direction is perpendicular or parallel to the long side of the OLED display panel, ensuring a certain deviation between the laser's polarization direction and the optical axis of the liquid crystal retardation film. This avoids cracking issues caused by laser cutting of the quarter-liquid crystal retardation film and improves cutting precision.

[0056] In one specific embodiment of this application, the first included angle is 45° or 135° and the second included angle is 45°.

[0057] Specifically, when the angle between the absorption axis of the linearly polarizing layer and the optical axis of the quarter-liquid liquid crystal retardation film is 45° or 135°, the quarter-liquid liquid crystal retardation film introduces a 90° phase difference into the two orthogonal polarization components perpendicular to and parallel to its optical axis. When the amplitudes of these two components are equal and the phase difference is 90°, circularly polarized light is formed. Similarly, 135° can also be considered as a complementary angle to 45°, producing the same effect.

[0058] By precisely controlling the first angle between the absorption axis of the linear polarization layer and the optical axis of the 1 / 4 liquid crystal retardation film to be 45° or 135°, and the second angle between the optical axis of the 1 / 4 liquid crystal retardation film and the long side of the OLED display panel to be 45°, the light transmission path can be optimized, reducing unnecessary reflection, scattering or absorption of light when passing through these layers, thereby improving light utilization efficiency and making the display brighter.

[0059] For example, Figure 3 This can serve as an example of the angle between the absorption axis of the linearly polarized layer, the optical axis of the quarter-liquid retardation film, and the polarization direction of the laser. The absorption axis of the linearly polarized layer forms a 45° or 135° angle with the optical axis of the quarter-liquid retardation film; the optical axis of the quarter-liquid retardation film forms a 45° angle with the long side of the OLED display panel; the polarization direction of the pulsed laser is perpendicular to the long side of the OLED display panel, but not at a 45° angle.

[0060] In one specific embodiment of this application, the angle between the absorption axis of the linearly polarized layer and the optical axis of the liquid crystal phase retardation film is a third angle. One of the optical axis of the liquid crystal phase retardation film and the polarization direction of the laser is parallel to the long side of the OLED display panel, and the other of the optical axis of the liquid crystal phase retardation film and the polarization direction of the laser is perpendicular to the long side of the OLED display panel, wherein the third angle is not 0.

[0061] Specifically, either the optical axis of the 1 / 4 liquid crystal phase retardation film or the polarization direction of the laser is parallel to the long side of the OLED display panel, while the other is perpendicular to the long side of the OLED display panel. This ensures that the polarization direction of the laser maintains a certain deviation from the optical axis of the liquid crystal phase retardation film, avoiding cracking problems caused by laser cutting of the 1 / 4 liquid crystal phase retardation film and improving cutting accuracy.

[0062] In one specific embodiment of this application, the third included angle is 45° or 135°.

[0063] Specifically, when the angle between the absorption axis of the linearly polarizing layer and the optical axis of the quarter-liquid liquid crystal retardation film is 45° or 135°, the quarter-liquid liquid crystal retardation film introduces a 90° phase difference into the two orthogonal polarization components perpendicular to and parallel to its optical axis. When the amplitudes of these two components are equal and the phase difference is 90°, circularly polarized light is formed. Similarly, 135° can also be considered as a complementary angle to 45°, producing the same effect.

[0064] For example, Figure 4 and Figure 5 This can serve as an example of the angle between the absorption axis of the linearly polarized layer, the optical axis of the 1 / 4 liquid crystal phasor film, and the laser polarization direction.

[0065] like Figure 4 As shown, the absorption axis of the linearly polarized layer is at 45° or 135° to the optical axis of the 1 / 4 liquid crystal retardation film; the optical axis of the 1 / 4 liquid crystal retardation film is parallel to the long side of the OLED display panel, and the polarization direction of the laser is perpendicular to the long side of the OLED display panel when cutting the long side of the OLED display panel.

[0066] like Figure 5 As shown, the absorption axis of the linearly polarized layer is at 45° or 135° to the optical axis of the 1 / 4 liquid crystal retardation film. The optical axis of the 1 / 4 liquid crystal retardation film is perpendicular to the long side of the OLED display panel. The polarization direction of the laser is parallel to the long side of the OLED display panel when cutting the long side. Example 2

[0067] In this embodiment, taking a 1 / 4 liquid crystal retardation film and a 1 / 2 liquid crystal retardation film sequentially along the light emission direction of the OLED display panel as an example of the liquid crystal retardation film, the cutting method of the polarizer for the OLED display panel of this application will be described in detail. The polarization direction of the laser deviates from the optical axes of both the 1 / 4 liquid crystal retardation film and the 1 / 2 liquid crystal retardation film outside the first angle range.

[0068] A 1 / 2 liquid crystal phase retardation film, also known as a half-wave plate, can produce a 180° phase difference between two orthogonal polarization components that are perpendicular to and parallel to its optical axis. As a result, the polarization direction of the output light is rotated by 90° relative to the polarization direction of the input light.

[0069] In the light-emitting direction of the OLED display panel, the 1 / 4 liquid crystal phase retardation film and the 1 / 2 liquid crystal phase retardation film are arranged in sequence, which helps to optimize the effect of polarized light and ensure that the light emitted from the OLED panel has the required polarization characteristics, thereby improving the display effect.

[0070] The polarization direction of the laser deviates from the optical axes of the 1 / 4 liquid crystal phase retardation film and the 1 / 2 liquid crystal phase retardation film both outside the first angle range. That is, the angle between the polarization direction of the laser and the optical axes of the 1 / 4 liquid crystal phase retardation film and the 1 / 2 liquid crystal phase retardation film is not within the predefined first angle range. This effectively avoids cracking of the liquid crystal phase retardation film caused by the polarization direction being too close to or coincident with the optical axis of the phase retardation film during the laser cutting process, improves the cutting accuracy, and helps to ensure the stability of the OLED display panel.

[0071] In one specific embodiment of this application, θ1 = 15°.

[0072] Specifically, by setting the polarization direction of the laser to deviate from the optical axes of both the 1 / 4 liquid crystal phase retardation film and the 1 / 2 liquid crystal phase retardation film outside the range of [-15°, 15°], the laser polarization direction does not directly point to the optical axes of the 1 / 4 liquid crystal phase retardation film and the 1 / 2 liquid crystal phase retardation film. This weakens the direct interaction between the laser and the liquid crystal molecules, reduces the scattering and reflection of the laser within the film, and helps the laser beam to be focused more accurately on the area to be cut, improving the cutting precision and edge smoothness, thereby ensuring the consistency and stability of the cutting effect.

[0073] For example, Figure 6 This can serve as an example of the laser's polarization direction deviating from the optical axis of the 1 / 4 liquid crystal phasor film and the 1 / 2 liquid crystal phasor film.

[0074] In one specific embodiment of this application, the angle between the absorption axis of the linearly polarized layer and the optical axis of the 1 / 2 liquid crystal retardation film is the fourth angle, the angle between the absorption axis of the linearly polarized layer and the optical axis of the 1 / 4 liquid crystal retardation film is the fifth angle, the optical axis of the 1 / 2 liquid crystal retardation film forms a sixth angle with the long side of the OLED display panel, the optical axis of the 1 / 4 liquid crystal retardation film forms a seventh angle with the long side of the OLED display panel, and the polarization direction of the laser is perpendicular to or parallel to the long side of the OLED display panel, wherein the fourth, fifth, sixth, and seventh angles are all non-zero.

[0075] The angle between the absorption axis of the linear polarization layer and the optical axis of the 1 / 2 liquid crystal retardation film is crucial for controlling the polarization state of light after passing through the 1 / 2 retardation film from the linear polarization layer. In particular, when this angle is not 0, the rotation of polarized light can be achieved, thereby optimizing the viewing angle performance and contrast of the display panel.

[0076] The absorption axis of the linear polarization layer maintains a certain angle with the optical axis of the quarter-phase retardation film, which can convert linearly polarized light into circularly polarized or elliptically polarized light. The fact that the fifth angle is not zero means that the polarization characteristics of laser or natural light change after passing through the quarter-phase retardation film, which helps reduce ambient light reflection and improve display quality.

[0077] The angle between the optical axis of the 1 / 2 liquid crystal phase retardation film and the long side of the OLED display panel can further optimize the conversion of polarized light and the viewing angle dependence of the display panel, ensuring that the color and brightness of the displayed content remain consistent under different viewing angles.

[0078] Setting the angle between the optical axis of the 1 / 4 liquid crystal phase retardation film and the long side of the OLED display panel is beneficial for optimizing the display effect, especially in handling the conversion of circularly polarized light.

[0079] The laser polarization direction is set to be perpendicular or parallel to the long side of the OLED display panel. This ensures that when the laser beam cuts the area to be cut, the polarization direction of the laser does not directly point to the optical axis of the 1 / 4 liquid crystal phase retardation film and the 1 / 2 liquid crystal phase retardation film. This helps to improve the accuracy and efficiency of laser cutting and avoids cracking of the liquid crystal phase retardation film due to improper polarization direction.

[0080] In one specific embodiment of this application, the fourth included angle is [55°, 85°], the fifth included angle is [5°, 35°], the sixth included angle is [10°, 40°], and the seventh included angle is [-40°, -10°].

[0081] Specifically, the absorption axis of the linearly polarized layer can be 70°±15° to the optical axis of the half-liquid crystal retardation film, the absorption axis of the linearly polarized layer can be 20°±15° to the optical axis of the quarter-liquid crystal retardation film, the optical axis of the half-liquid crystal retardation film can be 25°±15° to the long side of the OLED display panel, and the optical axis of the quarter-liquid crystal retardation film can be -25°±15° to the long side of the OLED display panel. The polarization direction of the laser can be perpendicular or parallel to the long side of the OLED display panel, but the polarization direction of the laser cannot be 25°±15° or -25°±15° to the long side of the OLED display panel. In other words, the polarization direction of the laser cannot coincide with the optical axes of the half-liquid crystal retardation film and the quarter-liquid crystal retardation film. Thus, by controlling the polarization direction of the laser, efficient and precise cutting of the polarizer is achieved, avoiding the cracking problem of the liquid crystal retardation film after laser cutting and ensuring that the performance of the liquid crystal retardation film is not affected. For example, Figure 7 This can serve as an example of the laser's polarization direction deviating from the optical axis of the 1 / 4 liquid crystal phasor film and the 1 / 2 liquid crystal phasor film.

[0082] Figure 8(a) is a scanning electron microscope (SEM) image of a sample obtained when the absorption axis of the linear polarization layer is at a 45° angle to the optical axis of the quarter-liquid crystal retardation film, the optical axis of the quarter-liquid crystal retardation film is perpendicular to the long side of the OLED display panel, and the polarization direction of the pulsed laser is parallel to the long side of the OLED display panel during cutting. Figure 8(b) is a SEM image of a sample obtained in the prior art when the absorption axis of the linear polarization layer is at a 45° angle to the optical axis of the quarter-liquid crystal retardation film, and both the optical axis of the quarter-liquid crystal retardation film and the polarization direction of the pulsed laser are perpendicular to the long side of the OLED display panel. The comparison shows that cutting the polarizer using the method shown in Figure 8 can effectively avoid microcracks after laser cutting.

[0083] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effect of this application, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of this application.

[0084] The technical solution of this application has been described in conjunction with the specific embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A method for cutting polarizers for OLED display panels, characterized in that, The method includes: A polarizer is attached to the light-emitting side of an OLED display panel, wherein the polarizer comprises a liquid crystal phase difference film and a linear polarization layer in sequence along the light-emitting direction of the OLED display panel. The area to be cut by the polarizer is irradiated with a laser, wherein the polarization direction of the laser deviates from the optical axis of the liquid crystal phase difference film by a first angle range, wherein the first angle range is [-θ1, θ1], and θ1 is greater than 0.

2. The method for cutting polarizers for OLED display panels according to claim 1, characterized in that, The liquid crystal phase retardation film is a 1 / 4 liquid crystal phase retardation film.

3. The method for cutting polarizers for OLED display panels according to claim 2, characterized in that, The θ1 = 15°.

4. The method for cutting polarizers for OLED display panels according to claim 2 or 3, characterized in that, The angle between the absorption axis of the linearly polarized layer and the optical axis of the liquid crystal phase retardation film is the first angle, the optical axis of the liquid crystal phase retardation film forms a second angle with the long side of the OLED display panel, and the polarization direction of the laser is perpendicular or parallel to the long side of the OLED display panel, wherein neither the first angle nor the second angle is 0.

5. The method for cutting polarizers for OLED display panels according to claim 4, characterized in that, The first included angle is 45° or 135° and the second included angle is 45°.

6. The method for cutting a polarizer for an OLED display panel according to claim 2 or 3, characterized in that, The angle between the absorption axis of the linear polarization layer and the optical axis of the liquid crystal phase retardation film is a third angle. One of the optical axis of the liquid crystal phase retardation film and the polarization direction of the laser is parallel to the long side of the OLED display panel, and the other of the optical axis of the liquid crystal phase retardation film and the polarization direction of the laser is perpendicular to the long side of the OLED display panel, wherein the third angle is not 0.

7. The method for cutting polarizers for OLED display panels according to claim 6, characterized in that, The third included angle is 45° or 135°.

8. The method for cutting polarizers for OLED display panels according to claim 1, characterized in that, The liquid crystal phase retardation film includes a 1 / 4 liquid crystal phase retardation film and a 1 / 2 liquid crystal phase retardation film in sequence along the light emission direction of the OLED display panel, wherein the polarization direction of the laser deviates from the optical axis of both the 1 / 4 liquid crystal phase retardation film and the 1 / 2 liquid crystal phase retardation film outside the first angle range.

9. The method for cutting a polarizer for an OLED display panel according to claim 8, characterized in that, The θ1 = 15°.

10. The method for cutting a polarizer for an OLED display panel according to claim 8 or 9, characterized in that, The angle between the absorption axis of the linearly polarized layer and the optical axis of the 1 / 2 liquid crystal retardation film is the fourth angle; the angle between the absorption axis of the linearly polarized layer and the optical axis of the 1 / 4 liquid crystal retardation film is the fifth angle; the optical axis of the 1 / 2 liquid crystal retardation film forms a sixth angle with the long side of the OLED display panel; the optical axis of the 1 / 4 liquid crystal retardation film forms a seventh angle with the long side of the OLED display panel; and the polarization direction of the laser is perpendicular to or parallel to the long side of the OLED display panel, wherein the fourth, fifth, sixth, and seventh angles are all non-zero.

11. The method for cutting a polarizer for an OLED display panel according to claim 10, characterized in that, The fourth included angle is [55°, 85°], the fifth included angle is [5°, 35°], the sixth included angle is [10°, 40°], and the seventh included angle is [-40°, -10°].

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