Compensation film, circular polarizer and display device

Abstract

The utility model discloses a compensation film, a circular polarizer and a display device. The compensation film comprises a first protective film, a liquid crystal compensation film and a second protective film, the first protective film and the second protective film are located on the two opposite sides of the liquid crystal compensation film. The value range of the included angle between the optical axis of the liquid crystal compensation film and the first plane is 15-30 degrees; the first plane is parallel to the plane of the liquid crystal compensation film. By means of the structure, circularly polarized light formed after passing through the liquid crystal compensation film can be finally fully absorbed, the reflectivity of the display device can be reduced to 5% or below, the better extinction effect is achieved, the extinction rate reaches 99% or above, the contrast ratio of the display device is improved, a user can clearly see content displayed on the display device, and the display quality is improved. And the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compensation films, in particular to a compensation film, a circular polarizer and a display device. Background Art

[0002] In an organic light emitting diode display (OLED Display), metal electrodes easily reflect natural light in the environment, resulting in reduced contrast. Therefore, a circular polarizer consisting of a linear polarizer and a compensation film is usually attached to the light emitting surface to improve the reflection problem.

[0003] Traditional compensation films are usually prepared with compensation films with an optical axis angle of 0 or 90°; however, when linearly polarized light passes through the compensation film prepared with this optical axis angle, the polarized light formed is usually elliptically polarized light, and the elliptically polarized light will eventually pass through the linear polarizer and be emitted from the light-emitting surface of the linear polarizer, resulting in a low contrast of the display, poor extinction effect, high reflectivity of the display screen, and poor picture quality, which makes the user experience bad. Utility Model Content

[0004] The utility model provides a compensation film, a circular polarizer and a display device to solve the defects of the prior art. By setting the angle between the liquid crystal compensation film and the first plane, when the compensation film is applied to the display device, the reflectivity of the display device can be reduced to less than 5%, thereby improving the contrast of the display device and enhancing the user experience.

[0005] In a first aspect, the utility model provides a compensation film, including: a first protective film, a liquid crystal compensation film and a second protective film;

[0006] Wherein, the first protective film and the second protective film are located on opposite sides of the liquid crystal compensation film;

[0007] The value range of the angle between the optical axis of the liquid crystal compensation film and the first plane is 15° to 30°; the first plane is parallel to the plane where the liquid crystal compensation film is located.

[0008] Optionally, the liquid crystal compensation film includes a first liquid crystal compensation layer and a second liquid crystal compensation layer;

[0009] The optical axis angle of the first liquid crystal compensation layer ranges from 0 to 30°, and the optical axis angle of the second liquid crystal compensation layer ranges from 60° to 90°; or,

[0010] The value range of the optical axis angle of the first liquid crystal compensation layer is 60° to 90°, and the value range of the optical axis angle of the second liquid crystal compensation layer is 0° to 30°.

[0011] Optionally, the liquid crystal compensation film further includes an adhesive layer; the first liquid crystal compensation layer and the second liquid crystal compensation layer are bonded together via the adhesive layer.

[0012] Optionally, the thickness of the bonding layer ranges from 0 to 25 um.

[0013] Optionally, the peeling force of the first protective film on the liquid crystal compensation film ranges from 0 to 50 gf / 25 mm;

[0014] The peeling force of the second protective film on the liquid crystal compensation film ranges from 0 to 50 gf / 25 mm;

[0015] The peeling force of the adhesive layer on the first liquid crystal compensation layer and the second liquid crystal compensation layer is greater than or equal to 500gf / 25mm;

[0016] The peeling force of the second protective film on the liquid crystal compensation film is not equal to the peeling force of the first protective film on the liquid crystal compensation film.

[0017] Optionally, the thickness of the liquid crystal compensation film is less than or equal to 30 um;

[0018] The thickness of the first protective film and the second protective film both range from 20 um to 200 um.

[0019] Optionally, when the wavelength of light is 550 nm, the delay amount of the liquid crystal compensation film ranges from 160 nm to 220 nm.

[0020] Optionally, the transmittance of the liquid crystal compensation film is greater than or equal to 90%; and the haze of the liquid crystal compensation film is less than or equal to 1%.

[0021] In a second aspect, the utility model provides a circular polarizer, comprising: a linear polarizer and the above-mentioned compensation film.

[0022] In a third aspect, the utility model provides a display device, comprising: a display panel and the above-mentioned circular polarizer; the circular polarizer is at least located on the display surface side of the display panel.

[0023] The technical solution of the utility model sets the value range of the angle between the optical axis of the liquid crystal compensation film and the first plane, and the first plane is parallel to the plane where the liquid crystal compensation film is located, so that the value range of the angle is between 15° and 30°, so that after the light passes through the linear polarizer and the liquid crystal compensation film, circular polarization is formed, and the circular polarization is incident on the display panel and reflected in the display panel. The reflected circular polarization is transmitted to the linear polarizer according to the original optical path, and the linear polarizer completely absorbs the circular polarization, so that it cannot be emitted from the surface of the side of the linear polarizer away from the display panel. Through the above structure, the reflectivity of the display device is reduced to less than 5%, and the extinction rate reaches more than 99%, basically achieving complete extinction, improving the contrast of the display device, allowing users to view the content displayed on the display surface more pleasantly, and improving the user experience.

[0024] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the structure of a first compensation film provided in an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the structure of a second compensation film provided by an embodiment of the utility model;

[0028] Figure 3 A schematic structural diagram of a third compensation film provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] In one embodiment, Figure 1The schematic diagram of the structure of the first compensation film provided by the embodiment of the utility model is as follows: Figure 1 As shown, the compensation film includes: a first protective film 1, a liquid crystal compensation film 2 and a second protective film 3; wherein the first protective film 1 and the second protective film 3 are located on opposite sides of the liquid crystal compensation film 2; the angle between the optical axis of the liquid crystal compensation film 2 and the first plane ranges from 15° to 30°; the first plane is parallel to the plane where the liquid crystal compensation film 2 is located.

[0032] The first protective film 1 and the second protective film 3 are used to protect the liquid crystal compensation film 2 so that the liquid crystal compensation film 2 will not be damaged when not in use. When the liquid crystal compensation film 2 is used, that is, before the liquid crystal compensation film 2 is set between the linear polarizer and the display device, the first protective film 1 and the second protective film 3 need to be peeled off to ensure that the light can be transmitted normally; the materials of the first protective film 1 and the second protective film 3 can include but are not limited to polymer films such as PET, PMMA, PC, TAC, COP or COC. The liquid crystal compensation film 2 is used to convert linear polarization into circular polarization to reduce the reflectivity of the display device; the material of the liquid crystal compensation film 2 can be selected but not limited to liquid crystal polymer; usually, the liquid crystal compensation film 2 can stretch the liquid crystal polymer through coating and other processes, and finally fit between the display device and the linear polarizer.

[0033] Specifically, in a display device, in order to reduce the reflectivity of the display device so that the user can intuitively and clearly see the content displayed by the display device, a circular polarizer is usually attached to the display surface side of the display panel. Usually, the circular polarizer can include a compensation film and a linear polarizer, and the compensation film is located between the linear polarizer and the display device. The equivalent angle between the compensation film and the linear polarizer can be set to 45° to ensure that the linear polarization can be converted into circular polarization. Therefore, when the natural light of the external environment is incident on the display device, it will first reach the surface of the linear polarizer. After the incident natural light passes through the linear polarizer, linear polarization will be formed. The formed linear polarization will be incident on the liquid crystal compensation film 2. When the linear polarization is incident on the liquid crystal compensation film 2, the liquid crystal compensation film 2 will convert the received linear polarization into circular polarization. The circular polarization will eventually be incident on the display panel and reflected in the display panel. The reflected light will be transmitted in the opposite direction according to the original light path, that is, after the reflected circular polarization is incident on the liquid crystal compensation film 2, the circular polarization will be transmitted. It will be converted into linear polarized light, and the converted linear polarized light will eventually be emitted from the liquid crystal compensation film 2 and reach the linear polarizer. Since the polarization direction of the linear polarized light is perpendicular to the linear polarized light formed after the natural light of the external environment passes through the linear polarizer, when the linear polarized light emitted by the liquid crystal compensation film 2 is incident on the linear polarizer, the absorption axis of the linear polarizer will completely absorb the incident linear polarized light, so that it cannot be emitted from the side surface of the linear polarized light away from the display panel; this reduces the reflectivity of the display device, improves the extinction rate and contrast of the display device, and allows users to have a better experience.

[0034] It should be noted that, in the present embodiment, by setting the value range of the angle between the optical axis of the liquid crystal compensation film 2 and the first plane, and the first plane being parallel to the plane where the liquid crystal compensation film 2 is located, the value range of the angle is between 15° and 30°, and the liquid crystal compensation film 2 produced at this angle can reduce the reflectivity of the display device to below 5%; and when the circular polarization formed by the natural light of the external environment is incident on the circular polarizer and is reflected in the display panel, the reflected circular polarization will be absorbed on the linear polarizer after passing through the liquid crystal compensation film 2, thereby achieving the effect of extinction, and the extinction rate can reach more than 99%, thereby improving the contrast of the display device, allowing the user to view the content displayed on the display surface more pleasantly, thereby improving the user experience.

[0035] The technical solution of the embodiment of the utility model sets the value range of the angle between the optical axis of the liquid crystal compensation film and the first plane, and the first plane is parallel to the plane where the liquid crystal compensation film is located, so that the value range of the angle is between 15° and 30°, so that after the light passes through the linear polarizer and the liquid crystal compensation film, circular polarization is formed, and the circular polarization is incident on the display panel and reflected in the display panel. The reflected circular polarization is transmitted to the linear polarizer according to the original optical path, and the linear polarizer completely absorbs the circular polarization, so that it cannot be emitted from the surface of the side of the linear polarizer away from the display panel. Through the above structure, the reflectivity of the display device is reduced to less than 5%, and the extinction rate reaches more than 99%, which basically achieves complete extinction, improves the contrast of the display device, and allows users to view the content displayed on the display surface more pleasantly, thereby improving the user experience.

[0036] Optionally, the thickness of the liquid crystal compensation film 2 is less than or equal to 30 um; the thickness of the first protective film 1 and the second protective film 3 are both in the range of 20 um to 200 um.

[0037] Among them, the thickness of the liquid crystal compensation film 2 is less than or equal to 30um, for example, it can be 5um, 10um, 20um and 30um, etc., and the embodiment of the utility model does not limit the specific numerical relationship. In addition, the thickness of the first protective film 1 and the second protective film 3 ranges from 20um to 200um, for example, it can be 20um, 100um, 150um and 200um, etc., and the embodiment of the utility model does not limit the specific numerical relationship. In this way, the structure of the compensation film can be thinned, and then the structure of the circular polarizer formed can be thinned, so as to solve the peeling problem of the curved surface bonding edge of the liquid crystal compensation film 2, reduce the crease of the display panel, and achieve lightness and thinness.

[0038] Optionally, when the wavelength of light is 550 nm, the delay value of the liquid crystal compensation film 2 ranges from 160 nm to 220 nm.

[0039] The retardation value of the liquid crystal compensation film 2 is in the range of 160nm to 220nm, for example, 160nm, 180nm, 200nm and 220nm, etc. The embodiment of the utility model does not limit the specific numerical relationship. Thus, when the wavelength of light is 550nm, the liquid crystal compensation film 2 prepared with the retardation value is combined with the linear polarizer to achieve an extinction effect of more than 99% on the natural light of the external environment, and the reflectivity of the display device is reduced to less than 5%.

[0040] Optionally, the transmittance of the liquid crystal compensation film 2 is greater than or equal to 90%; and the haze of the liquid crystal compensation film 2 is less than or equal to 1%.

[0041] Among them, the transmittance of the liquid crystal compensation film 2 is greater than or equal to 90%, for example, it can be 90%, 94%, 96% and 98%, etc., and the embodiment of the utility model does not limit the specific numerical relationship. In this way, the liquid crystal compensation film 2 and the linear polarizer can achieve a better extinction effect without affecting the display brightness of the display device, so that the user can check the content displayed on the display device within a normal distance range. In addition, the haze of the liquid crystal compensation film 2 is less than or equal to 1%, for example, it can be 0.2%, 0.5%, 0.8% and 1%, etc., and the embodiment of the utility model does not limit the specific numerical relationship. In this way, the liquid crystal compensation film 2 and the linear polarizer can achieve a better extinction effect without affecting the clarity of the display device, so that the user can clearly see the content displayed by the display device.

[0042] Optional, Figure 2 The schematic diagram of the structure of the second compensation film provided by the embodiment of the utility model is shown in FIG. Figure 2 As shown, the liquid crystal compensation film 2 includes a first liquid crystal compensation layer 21 and a second liquid crystal compensation layer 22; the optical axis angle of the first liquid crystal compensation layer 21 ranges from 0 to 30°, and the optical axis angle of the second liquid crystal compensation layer 22 ranges from 60° to 90°; or, the optical axis angle of the first liquid crystal compensation layer 21 ranges from 60° to 90°, and the optical axis angle of the second liquid crystal compensation layer 22 ranges from 0 to 30°.

[0043] The first liquid crystal compensation layer 21 is used to rotate the incident linear polarization by a certain angle; the second liquid crystal compensation layer 22 is used to convert the rotated linear polarization into circular polarization. In this embodiment, the materials of the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 may include liquid crystal polymers. Exemplarily, the first liquid crystal compensation layer 21 may include a half-wave plate, and the second liquid crystal compensation layer 22 may include a quarter-wave plate.

[0044] Specifically, when the linear polarized light is incident on the liquid crystal compensation film 2, it will first be incident on the first liquid crystal compensation layer 21, and the first liquid crystal compensation layer 21 will rotate the received linear polarized light by a certain angle. The rotated linear polarized light will be incident on the second liquid crystal compensation layer 22, and the second liquid crystal compensation layer 22 will convert the received linear polarized light into circular polarized light. The converted circular polarized light will be incident on the display panel and reflected in the display panel. The reflected light will be transmitted along the original optical path, that is, after the circular polarized light is incident on the second liquid crystal compensation layer 22, it will be converted into linear polarized light. After the linear polarized light is incident on the first liquid crystal compensation layer 21, it will be reversely rotated by an angle and will still be incident on the display panel when it is emitted. Of course, it is linear polarized light, and the linear polarized light is finally emitted from the liquid crystal compensation film 2 and reaches the linear polarizer. Since the polarization direction of the linear polarized light is perpendicular to the linear polarized light formed after the natural light of the external environment passes through the linear polarizer, when the linear polarized light is incident on the linear polarizer, the linear polarizer will absorb the incident linear polarized light, so that it cannot be emitted from the surface of the side of the linear polarizer away from the display panel, so that the reflectivity of the display device can be reduced to less than 5%, and the extinction rate reaches more than 99%, achieving a better extinction effect, effectively improving the contrast of the display device, so that the user can still fully see the content displayed by the display device even when the natural light is strong.

[0045] It should be noted that when the optical axis angle of the first liquid crystal compensation layer 21 is in the range of 0 to 30°, the corresponding optical axis angle of the second liquid crystal compensation layer 22 is in the range of 60° to 90°; or, when the optical axis angle of the first liquid crystal compensation layer 21 is in the range of 60° to 90°, the corresponding optical axis angle of the second liquid crystal compensation layer 22 is in the range of 0 to 30°. In a specific embodiment, it is only necessary to ensure that the included angle between the optical axis angles of the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 is in the range of 55° to 65°, for example, the included angle is 60°, so that the linear polarized light incident from the linear polarizer can be finally formed into circular polarized light after passing through the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22, so that the reflectivity of the display device is reduced to less than 5%, and the extinction rate reaches more than 99%. It can be understood that the selection of the optical axis angle of the first liquid crystal compensation layer 21 and the optical axis angle of the second liquid crystal compensation layer 22 can be determined according to actual conditions, and the embodiment of the utility model does not limit this.

[0046] Optional, Figure 3 The schematic diagram of the structure of the third compensation film provided by the embodiment of the utility model is shown in FIG. Figure 3 As shown, the liquid crystal compensation film 2 further includes an adhesive layer 23 ; the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 are bonded together via the adhesive layer 23 .

[0047] The bonding layer 23 is used to bond the first liquid crystal compensation layer 21 to the second liquid crystal compensation layer 22. The material of the bonding agent 23 may include, but is not limited to, epoxy, vinyl alcohol, acrylate adhesives, polyurethane adhesives, chloroprene rubber, styrene-butadiene rubber, cyano rubber or silicone rubber.

[0048] Optionally, the thickness of the bonding layer 23 ranges from 0 to 25 um.

[0049] The thickness of the adhesive layer 23 ranges from 0 to 25 um, for example, 0, 10 um, 20 um, and 25 um, etc. The embodiment of the utility model does not limit the specific numerical relationship. In this way, the structure of the liquid crystal compensation film 2 can be thinned and made lighter.

[0050] Optionally, the peeling force of the first protective film 1 on the liquid crystal compensation film 2 ranges from 0 to 50 gf / 25mm; the peeling force of the second protective film 3 on the liquid crystal compensation film 2 ranges from 0 to 50 gf / 25mm; the peeling force of the adhesive layer 23 on the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 is greater than or equal to 500 gf / 25mm; wherein, the peeling force of the second protective film on the liquid crystal compensation film is not equal to the peeling force of the first protective film on the liquid crystal compensation film.

[0051] When the compensation film is applied to the display panel, the first protective film 1 and the second protective film 3 on both sides of the liquid crystal compensation film 2 need to be peeled off, and the peeling force of the first protective film 1 on the liquid crystal compensation film 2 ranges from 0 to 50gf / 25mm, for example, it can be 0, 10gf / 25mm, 30gf / 25mm and 50gf / 25mm, etc. The embodiment of the utility model does not limit the specific numerical relationship. In addition, the peeling force of the second protective film 3 on the liquid crystal compensation film 2 ranges from 0 to 50gf / 25mm, for example, it can be 0gf / 25mm, 10gf / 25mm, 30gf / 25mm and 50gf / 25mm, etc. The embodiment of the utility model does not limit the specific numerical relationship. Normally, the peeling force of the second protective film 3 on the liquid crystal compensation film 2 is not equal to the peeling force of the first protective film 1 on the liquid crystal compensation film 2. This can prevent the liquid crystal compensation film 2 from being delaminated during the peeling process, thereby preventing damage to the liquid crystal compensation film 2. It can also avoid the generation of bubbles before peeling, thereby preventing the film from being unusable, thereby ensuring the quality of the liquid crystal compensation film 2.

[0052] In addition, in the present embodiment, the liquid crystal compensation film 2 includes a first liquid crystal compensation layer 21 and a second liquid crystal compensation layer 22, and the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 are bonded by a bonding layer 23. When the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 are peeled off, the peeling force of the bonding layer 23 on the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 needs to be greater than or equal to 500gf / 25mm, for example, it can be 600gf / 25mm, 700gf / 25mm, 750gf / 25mm and 800gf / 25mm, etc. The present embodiment of the utility model does not limit the specific numerical relationship. In this way, the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 can be completely peeled off from the bonding layer 23, avoiding residual adhesive layer bonding to the first liquid crystal compensation layer 21 or the second liquid crystal compensation layer 22, which affects the extinction and reflection effects of the display device.

[0053] It can be understood that when the first protective film 1 and the second protective film 3 on both sides of the liquid crystal compensation film 2 are peeled off, and the first liquid crystal compensation layer 21 and the second liquid crystal compensation layer 22 are peeled off, the peeling angle can usually include but is not limited to 180° peeling, and of course 90° peeling is also possible. Under the premise of not affecting the core invention of the utility model, the embodiment of the utility model does not limit this.

[0054] Based on the same concept, the utility model also provides a circular polarizer, including: a linear polarizer and the above compensation film. With the technical features of the compensation film provided in the embodiment of the utility model, the same beneficial effects as the compensation film provided in the embodiment of the utility model can be achieved. The similarities are described above and will not be repeated here.

[0055] Based on the same concept, the utility model also provides a display device, including: a display panel and the above circular polarizer; the circular polarizer is at least located on the display surface side of the display panel. The technical features of the circular polarizer provided in the embodiment of the utility model can achieve the same beneficial effects as the circular polarizer provided in the embodiment of the utility model. The similarities are described above and will not be repeated here.

[0056] Exemplarily, the display device may include an OLED.

[0057] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0058] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A compensation film, characterized in that: include: A first protective film, a liquid crystal compensation film, and a second protective film; Wherein, the first protective film and the second protective film are located on two opposite sides of the liquid crystal compensation film; The angle between the optical axis of the liquid crystal compensation film and the first plane is in the range of 15° to 30°; the first plane is parallel to the plane where the liquid crystal compensation film is located.

2. The compensation film according to claim 1, characterized in that: The liquid crystal compensation film includes a first liquid crystal compensation layer and a second liquid crystal compensation layer; The optical axis angle of the first liquid crystal compensation layer ranges from 0° to 30°, and the optical axis angle of the second liquid crystal compensation layer ranges from 60° to 90°; or, The optical axis angle of the first liquid crystal compensation layer ranges from 60° to 90°, and the optical axis angle of the second liquid crystal compensation layer ranges from 0° to 30°.

3. The compensation film according to claim 2, characterized in that: The liquid crystal compensation film further includes an adhesive layer; the first liquid crystal compensation layer and the second liquid crystal compensation layer are bonded together via the adhesive layer.

4. The compensation film according to claim 3, characterized in that: The thickness of the bonding layer ranges from 0 to 25 um.

5. The compensation film according to claim 3, characterized in that: The peeling force of the first protective film on the liquid crystal compensation film ranges from 0 to 50 gf / 25 mm; The peeling force of the second protective film on the liquid crystal compensation film ranges from 0 to 50 gf / 25 mm; The peeling force of the adhesive layer on the first liquid crystal compensation layer and the second liquid crystal compensation layer is greater than or equal to 500gf / 25mm; Wherein, the peeling force of the second protective film on the liquid crystal compensation film is not equal to the peeling force of the first protective film on the liquid crystal compensation film.

6. The compensation film according to claim 1, characterized in that: The thickness of the liquid crystal compensation film is less than or equal to 30um; The thickness of the first protective film and the second protective film both range from 20 um to 200 um.

7. The compensation film according to claim 1, characterized in that: When the wavelength of light is 550 nm, the delay value of the liquid crystal compensation film ranges from 160 nm to 220 nm.

8. The compensation film according to claim 1, characterized in that: The transmittance of the liquid crystal compensation film is greater than or equal to 90%; the haze of the liquid crystal compensation film is less than or equal to 1%.

9. A circular polarizer, characterized in that: include: A linear polarizer and a compensation film as claimed in any one of claims 1 to 8.

10. A display device, characterized in that: include: A display panel and the circular polarizer according to claim 9; The circular polarizer is at least located on the display surface side of the display panel.

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