Liquid crystal compensation film, display panel and display device

Abstract

The embodiment of the utility model discloses a liquid crystal compensation film, a display panel and a display device. The liquid crystal compensation film comprises a substrate; the alignment layer is located on one side of the substrate and has a preset alignment direction; the liquid crystal optical layer is located on the side, away from the substrate, of the alignment layer, liquid crystals in the liquid crystal optical layer are arranged according to the preset alignment direction, and the compensation amount of the liquid crystal optical layer to light rays with the wave band of 550 nm is larger than or equal to 200 nm and smaller than or equal to 600 nm. According to the liquid crystal compensation film provided by the embodiment of the utility model, the alignment layer is coated on the substrate, the alignment layer can form the preset alignment direction by utilizing ultraviolet light with specific wavelength to pass through the photomask or directly irradiate the alignment layer, and the preset alignment direction induces the liquid crystal material to be arranged according to the preset direction; and forming the phase difference film with a specific angle and compensation amount.

Description

Technical Field

[0001] The utility model relates to the field of optical technology, and in particular to a liquid crystal compensation film, a display panel and a display device. Background Art

[0002] The phase difference compensation film in the existing technology usually uses polycarbonate (PC) raw material heated to a molten state, extruded into a film of a certain thickness through an extruder, and pre-stretched at a specific temperature, which helps to improve the mechanical strength and stability of the film. The film is stretched in the longitudinal direction (MD) at a controlled temperature, so that the molecular chains of the film are aligned along the stretching direction, thereby changing its optical properties.

[0003] However, the existing PC compensation film is uniaxially stretched, with the MD direction being the slow axis direction. When used, it requires post-processing, where the PC compensation film is cut into specific angles, spliced together, and then bonded to the polarizer. This results in low material utilization and is time-consuming. Utility Model Content

[0004] The utility model provides a liquid crystal compensation film, a display panel and a display device. The liquid crystal compensation film is coated with an alignment layer on a substrate. The alignment layer can form a preset alignment direction by using ultraviolet light of a specific wavelength through a photomask or directly irradiating the alignment layer. The preset alignment direction induces the liquid crystal material to align in a predetermined direction, forming a phase difference film with a specific angle and compensation amount.

[0005] According to one aspect of the present invention, there is provided a liquid crystal compensation film, comprising:

[0006] substrate;

[0007] an alignment layer located on one side of the substrate, the alignment layer having a preset alignment direction;

[0008] The liquid crystal optical layer is located on a side of the alignment layer away from the substrate, wherein the liquid crystal in the liquid crystal optical layer is arranged according to the preset alignment direction, and the compensation amount of the liquid crystal optical layer for 550nm band light is greater than or equal to 200nm and less than or equal to 600nm.

[0009] Optionally, the liquid crystal optical layer is a solid film layer, and the thickness of the solid film layer is less than or equal to 5.5 μm.

[0010] Optionally, the thickness of the solid film layer is 2.5 μm to 3.5 μm, and the compensation amount of the solid film layer for light in the 550 nm band is 378 nm to 398 nm.

[0011] Optionally, the thickness of the solid film layer is 4.5 μm to 5.5 μm, and the compensation amount of the solid film layer for light in the 550 nm band is 560 nm to 580 nm.

[0012] Optionally, the compensation film angle of the liquid crystal compensation film is adjustable in the range of 0 to 90°, and the compensation film angle is the angle between the optical slow axis of the liquid crystal compensation film and the direction of web production.

[0013] Optionally, a polarizer is further included, and the polarizer is located on a side of the liquid crystal optical layer away from the alignment layer.

[0014] Optionally, the birefringence difference of the liquid crystal in the liquid crystal optical layer is greater than or equal to 0.2 and less than or equal to 0.3.

[0015] Optionally, the substrate includes any one of polyethylene terephthalate (PET), cellulose triacetate (TAC), cycloolefin polymer (COP) or polymethyl methacrylate (PMMA).

[0016] According to another aspect of the present invention, a display panel is provided, comprising the above-mentioned liquid crystal compensation film.

[0017] According to another aspect of the present invention, a display device is provided, comprising the above-mentioned display panel.

[0018] The liquid crystal compensation film provided by the present invention comprises a substrate, an alignment layer located on one side of the substrate, and a liquid crystal optical layer. The alignment layer has a preset alignment direction, and the liquid crystals in the liquid crystal optical layer are arranged according to the preset alignment direction. The compensation amount of the liquid crystal optical layer for light in the 550nm band is greater than or equal to 200nm and less than or equal to 600nm. The technical solution of the present invention embodiment is that the alignment layer is coated on the substrate. The alignment layer can form a preset alignment direction by using ultraviolet light of a specific wavelength through a photomask or directly irradiating the alignment layer. The preset alignment direction induces the liquid crystal material to align in a predetermined direction, forming a phase difference film with a specific angle and different compensation amounts. Compared with traditional PC compensation films that require slicing at fixed angles and then splicing, resulting in relatively low material utilization (resulting in seams on the product that cannot be used) and time-consuming work, the liquid crystal compensation film provided by the present invention has higher production efficiency and product utilization.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 paying any creative work.

[0021] Figure 1 A schematic structural diagram of a liquid crystal compensation film provided by an embodiment of the present utility model;

[0022] Figure 2 A schematic diagram of the angle of a liquid crystal compensation film provided by an embodiment of the present invention;

[0023] Figure 3 This is a schematic structural diagram of another liquid crystal compensation film provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0024] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention 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 numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof 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.

[0026] Figure 1 This is a schematic diagram of the structure of a liquid crystal compensation film provided by an embodiment of the present invention, with reference to Figure 1The liquid crystal compensation film includes: a substrate 10; an alignment layer 20 located on one side of the substrate 10, the alignment layer 20 having a preset alignment direction; a liquid crystal optical layer 30 located on a side of the alignment layer 20 away from the substrate 10, the liquid crystals in the liquid crystal optical layer 30 are arranged according to the preset alignment direction, and the compensation amount of the liquid crystal optical layer 30 for light in the 550nm band is greater than or equal to 200nm and less than or equal to 600nm.

[0027] The substrate 10 is used to support the alignment layer 20 and the liquid crystal optical layer 30, and is generally formed of a flexible organic material. Optionally, the substrate 10 includes any one of polyethylene terephthalate (PET), cellulose triacetate (TAC), cycloolefin polymer (COP), or polymethyl methacrylate (PMMA). The alignment layer 20 is made of a photosensitive material. It is understood that during the photoalignment process, the polarization characteristics of the light will affect the orientation of the polymer chain, thereby inducing the liquid crystal material subsequently coated thereon to align in a predetermined direction. The angle control of the polarized light is extremely important, determining the alignment of the liquid crystal material in a predetermined direction and affecting the control of the angle accuracy. In specific implementation, the photoalignment material can be first coated on the bottom 10. During the photoalignment process, ultraviolet light of a specific wavelength is irradiated through a photomask or directly onto the substrate coated with the photosensitive alignment layer to form an alignment layer 20 with a preset alignment direction. Liquid crystal material is then applied to the alignment layer 20. The polarization properties of light affect the orientation of the polymer chains, inducing the subsequently applied liquid crystal material to align in a predetermined alignment direction, forming a retardation film with a specific angle. Furthermore, retardation films with varying compensation amounts can be obtained by controlling the thickness. Optionally, the liquid crystal optical layer 30 is a solid film layer with a thickness of less than or equal to 5.5 μm.

[0028] The solid film layer is formed by solidifying a liquid crystal material. Existing PC compensation films are relatively thick, approximately 50 to 60 μm. The technical solution of this embodiment can significantly reduce the film thickness. Optionally, when the solid film layer thickness is 2.5 to 3.5 μm, the compensation amount for 550 nm light is 378 to 398 nm; when the solid film layer thickness is 4.5 to 5.5 μm, the compensation amount for 550 nm light is 560 to 580 nm. In other embodiments, the thickness of the solid film layer can be designed based on actual conditions, and this embodiment of the utility model does not limit this.

[0029] Optionally, the birefringence difference of the liquid crystal in the liquid crystal optical layer is greater than or equal to 0.2 and less than or equal to 0.3.

[0030] Birefringence is the phenomenon in which a light beam incident on an anisotropic crystal decomposes into two beams, each refracting in different directions. When light propagates through an inhomogeneous material, its propagation velocity and refractive index change with the direction of vibration, resulting in more than one refractive index value. Except for specific directions, light waves incident on an inhomogeneous material undergo birefringence, decomposing into two polarized beams with mutually perpendicular vibration directions, different propagation velocities, and different refractive indices. This phenomenon is known as birefringence. In a birefringent crystal, one light source obeys the normal law of refraction and is called ordinary light (or o-light); the other light source does not obey the normal law of refraction and is called extraordinary light (or e-light). The difference between the refractive indices of o-light and e-light is the birefringence difference. Liquid crystal has a birefringence effect. A liquid crystal molecule can be regarded as a birefringent crystal, and a liquid crystal optical layer formed by multiple liquid crystal molecules can be regarded as a whole birefringent crystal. Among them, the birefringence difference of conventional liquid crystal materials is approximately between 0.01 and 0.15. In this embodiment, a high-refractive-index liquid crystal compensation film is provided, and the birefringence difference of the liquid crystal is between 0.2 and 0.3.

[0031] The technical solution of the embodiment of the present invention is that an alignment layer is coated on the substrate. The alignment layer can use ultraviolet light of a specific wavelength to form a preset alignment direction through a photomask or directly irradiate the alignment layer. The preset alignment direction induces the liquid crystal material to arrange in a predetermined direction to form a phase difference film with a specific angle and different compensation amounts. Compared with the traditional PC compensation film that needs to be sliced into fixed angles and then spliced together, resulting in relatively low material utilization (there are seams on the product, and the seams cannot be used) and time-consuming, the liquid crystal compensation film provided by the embodiment of the present invention has higher production efficiency and higher product utilization.

[0032] Optionally, the compensation film angle of the liquid crystal compensation film is adjustable from 0 to 90 degrees, and the compensation film angle is the angle between the optical slow axis of the liquid crystal compensation film and the direction of web production.

[0033] The liquid crystal compensation film provided by the embodiment of the present invention, through liquid crystal coating technology, can control the optical compensation amount in the 550nm band to 200nm ~ 600nm, and the coating uniformity of the entire width is controlled within 3%; the orientation coating and liquid crystal coating equipment can be linked together, and the coating can be completed in one go. The compensation film angle can be controlled at any angle from 0 to 90 degrees, and the accuracy is controlled within 0.8 degrees. It can be directly rolled to roll with other optical materials (such as polarizers). For example, Figure 2 A schematic diagram of compensation film angles of a liquid crystal compensation film provided by an embodiment of the present invention, wherein the first direction x represents the direction of web travel, the second direction y represents the slow axis direction of the optical axis, and α represents the compensation film angle.

[0034] Figure 3 This is a schematic diagram of the structure of another liquid crystal compensation film provided by the embodiment of the present invention, referring to Figure 3Optionally, the liquid crystal compensation film further includes a polarizer 40 , which is located on a side of the liquid crystal optical layer 30 away from the alignment layer 20 .

[0035] Among them, the polarizer can be roll-to-roll laminated with the liquid crystal compensation film. Compared with the traditional PC compensation film, which needs to be sliced into fixed angles and then spliced together, resulting in low material utilization (there are seams on the product and the seams cannot be used) and time-consuming work, it can reduce the process difficulty, improve production efficiency, and increase product utilization.

[0036] The present invention also provides a display panel including the liquid crystal compensation film provided in the above embodiment, wherein the display panel can be a liquid crystal display panel, an organic light emitting display panel, etc., and can be designed according to actual conditions during implementation, which is not limited by the present invention.

[0037] The present invention also provides a display device including the display panel provided in the above embodiment. The display device may be a mobile phone, a computer, or a smart wearable device (such as a virtual reality display device VR, an augmented reality display device AR), etc.

[0038] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A liquid crystal compensation film, characterized in that: include: substrate; an alignment layer located on one side of the substrate, the alignment layer having a preset alignment direction; The liquid crystal optical layer is located on a side of the alignment layer away from the substrate, wherein the liquid crystal in the liquid crystal optical layer is arranged according to the preset alignment direction, and the compensation amount of the liquid crystal optical layer for 550nm band light is greater than or equal to 200nm and less than or equal to 600nm.

2. The liquid crystal compensation film according to claim 1, wherein The liquid crystal optical layer is a solid film layer, and the thickness of the solid film layer is less than or equal to 5.5 μm.

3. The liquid crystal compensation film according to claim 2, wherein: The thickness of the solid film layer is 2.5 μm to 3.5 μm, and the compensation amount of the solid film layer to the 550 nm wavelength light is 378 nm to 398 nm.

4. The liquid crystal compensation film according to claim 2, characterized in that: The thickness of the solid film layer is 4.5 μm to 5.5 μm, and the compensation amount of the solid film layer for 550 nm wavelength light is 560 nm to 580 nm.

5. The liquid crystal compensation film according to claim 1, wherein: The compensation film angle of the liquid crystal compensation film is adjustable in the range of 0 to 90 degrees, and the compensation film angle is the angle between the optical slow axis of the liquid crystal compensation film and the direction of coil production.

6. The liquid crystal compensation film according to claim 1, characterized in that: The invention further comprises a polarizer, wherein the polarizer is located on a side of the liquid crystal optical layer away from the alignment layer.

7. The liquid crystal compensation film according to claim 1, characterized in that: The birefringence difference of the liquid crystal in the liquid crystal optical layer is greater than or equal to 0.2 and less than or equal to 0.

3.

8. The liquid crystal compensation film according to claim 1, wherein: The substrate includes any one of polyethylene terephthalate (PET), triacetyl cellulose (TAC), cycloolefin polymer (COP) or polymethyl methacrylate (PMMA).

9. A display panel, characterized in that: The invention comprises the liquid crystal compensation film according to any one of claims 1 to 8.

10. A display device, characterized in that: The display panel comprises the display panel according to claim 9.

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