TWI580995B - Anti-ambient-light-reflection film - Google Patents

Description

Anti-ambient light reflecting film

An anti-ambient light reflecting film, especially an anti-ambient light reflecting film which avoids ambient light reflection.

Due to the ever-increasing demands on the image performance of displays, 遂 has continuously developed various related technologies for improving image performance.

For example, an active-matrix organic light-emitting diode (AMOLED) display may cause reading interference and dark state due to reflection of an external light source through the metal electrode of the AMOLED. The general solution to the problem is to add a 1/4 λ wave plate and a linear polarizer combined circular polarizer to the outside of the AMOLED to circularly polarize the ambient light outside the incident AMOLED, and the incident circular polarized light (ex. left-handed light) will pass through. The metal electrode is inverted into an orthogonal circularly polarized light (ex. right-handed light), and thus the orthogonal circularly polarized light (right-handed light) passes through the 1/4 λ wave plate and becomes polarized light orthogonal to the polarization direction of the linear polarizing plate, and The polarized light whose polarization direction is orthogonal to the linear polarizing plate cannot be emitted by the linear polarizing plate, thereby eliminating the reflection caused by the external ambient light, thereby avoiding the problem of reading interference and dark state, so that the AMOLED can faithfully present information and improve contrast. .

AMOLED display using prior art anti-ambient light reflecting film It generally includes an AMOLED display unit and an anti-ambient light reflecting film.

The AMOLED display unit as described above comprises a cathode which is usually a metal electrode, a light-emitting layer formed on the cathode, and an anode formed on the light-emitting layer and which is usually a transparent electrode.

The anti-ambient light reflecting film as described above includes a linear polarizing layer and a 1/4 λ wave plate. The linearly polarizing layer may be a polymer containing an iodide ion or a dye, such as polyvinyl alcohol (PVA), and two support layers sandwiching the linearly polarizing layer therebetween. The support layer may be Triacetyl Cellulose Film (TAC) or an acryl resin or a cyclo olefin polymer (COP). The conventional ambient light reflecting film is a bonding method using, for example, an adhesive layer of Pressure Sensitive Adhesive (PSA), and the linear polarizing plate is attached to a 1/4 λ wave plate, and then the anti-ambient light reflecting film is borrowed. It is attached to the outside of the AMOLED display unit by an adhesive layer. Due to the bonding of the linear polarizing plate and the 1/4 λ wave plate, it is necessary to adjust the angle between the optical axis between the linear polarizing plate and the 1/4 λ wave plate to 45°, and since the optical axes of the two are in the production of the coil Parallel to the direction of travel of the machine, one of the pieces must be beveled by 45°, resulting in wasted material for the linear or quarter-wave plate and not being able to be rolled continuously.

Therefore, how to design an anti-ambient light reflecting film which does not need to cut a linear polarizing plate or a 1/4 λ wave plate is a major problem for those skilled in the art.

The present disclosure provides an anti-ambient light reflecting film comprising: a linear polarizing layer; and a single optically active liquid crystal layer formed on the linear polarizing layer, wherein the linear polarizing layer forms a contact surface with the single optically active liquid crystal layer, wherein , Along the contact surface, the first layer of molecules of the single optically active liquid crystal layer is aligned in the axial direction of the absorption axis of the linearly polarizing layer without a deflection angle.

The single optically active liquid crystal layer has a phase retardation and a rotation angle characteristic. By calculating, at least one of the phase retardation and the rotation angle range of the single optically active liquid crystal layer can convert the linear polarization of the line through the line to the circularly polarized light. And the parameter S ₃ in the Stokes vector is in the range of 0.9~1 or -0.9~-1. The phase delay is in the range of 0.181 λ~0.546 λ, and the rotation angle is in the range of 0.18 π~0.55 π or in the range of -0.18 π~-0.55 π. Further, the phase delay is 0.245 λ~0.473. The range of λ is in the range of 0.25 π to 0.47 π or in the range of -0.25 π to -0.47 π.

In another embodiment, the anti-ambient light reflecting film of the present disclosure comprises: a linear polarizing layer; a 1/4 λ wave plate whose optical axis is parallel to the optical axis of the linear polarizing layer; and a linear polarizing layer and a single optically active liquid crystal layer between the 1/4 λ wave plates, and the contact is formed on the 1/4 λ wave plate; wherein the single optically active liquid crystal layer is used to deflect an incident linear light axis by 45°; The 1/4 λ wave plate and the single optically active liquid crystal layer are used to convert an incident linear polarization into a circularly polarized light.

The single optically active liquid crystal layer has an optical conversion characteristic of rotating the optical axis of the linear polarization by 45°, and the phase delay is in the range of 0.55 λ to 0.76 λ, and the rotation angle is between 0.6 π and 0.85 π or Range of 0.6 π to -0.85 π. The 1/4 λ wave plate and the single optical liquid crystal have optical conversion characteristics for converting the linear polarization into the circular polarization, and the parameter in the Stokes vector is greater than 0.95. In addition, the 1/4 λ wave plate is not It has optical rotation characteristics.

In still another embodiment, the anti-ambient light reflecting film of the present disclosure The phase delay is in the range of 0.92 λ to 1.01 λ, which is in the range of 0.21 π to 0.29 π or -0.21 π to -0.29 π. The 1/4 λ wave plate and the single optically active liquid crystal layer are used to convert an incident linear polarization into a circularly polarized light, and the parameter in the corresponding wavelength 400-800 nm Stokes vector is greater than 0.95.

The anti-ambient light reflecting film proposed by the present disclosure is formed on the linear polarizing layer by directly and in contact with the optically active liquid crystal composite layer formed by a single optically active liquid crystal layer or a single optically active liquid crystal layer and a 1/4 λ wave plate. It can avoid the material and process waste caused by the cutting linear polarizer or the 1/4 λ wave plate in the prior art, and can be continuously produced in a roll type, and can greatly reduce the thickness, and has a single optical rotation formed on the line polarizing layer. The optically active liquid crystal composite layer composed of the liquid crystal layer and the 1/4 λ wave plate can additionally correspond to a larger wavelength range.

21‧‧‧Anti-environmental light reflecting film

211‧‧‧Line polarizer

2112‧‧‧Support layer

2111‧‧‧ polymer layer

214, 214a‧‧‧ single optically active liquid crystal layer

216‧‧‧1/4 λ wave plate

D‧‧‧thickness

I‧‧‧Injection direction

Φ‧‧‧rotation angle

1 is a cross-sectional view showing an aspect of the anti-ambient light reflecting film of the present disclosure; FIG. 2 is a schematic view showing the liquid crystal structure of the single optically active liquid crystal layer formed on the linear polarizing layer of the present disclosure; FIG. 3 is a view showing the present disclosure a single optically active liquid crystal layer for a visible light band spectrum; FIG. 4A is a cross-sectional view of another aspect of the anti-ambient light reflecting film disclosed herein, and FIG. 4B is a single optical liquid crystal for rotating a linearly polarized optical axis by 45°; A schematic diagram of the phase difference Re of each wavelength band λ in the visible light band of the optically active liquid crystal composite layer formed by the layer and the 1/4 λ wave plate; FIG. 5 illustrates a single optical liquid crystal layer and a 1/4 λ wave plate. A schematic diagram of the phase difference Re of each wavelength band λ in the visible light band of the optically active liquid crystal composite layer; and 6A to 6C are cross-sectional views of the ambient light reflecting film of each aspect of the linear polarizing layer disclosed herein.

The embodiments of the present disclosure are described below by way of specific embodiments, and those skilled in the art can readily appreciate the other advantages and functions of the present disclosure. The present invention may be embodied or applied in various other specific embodiments. The details of the present invention can be variously modified and changed without departing from the spirit and scope of the invention.

Referring to FIG. 1 , which is a cross-sectional view of an embodiment of the anti-ambient light reflecting film of the present disclosure, the anti-ambient light reflecting film 21 includes a linear polarizing layer 211 and a single optically active liquid crystal layer 214 that contacts the in-line polarizing layer 211 .

The material of the linearly polarizing layer 211 as described above may include a dichroic dye and a polymerizable liquid crystal, and the polymerizable liquid crystal may be formed by polymerizing a lyotropic liquid crystal. For example, the method of manufacturing the linear polarizing layer 211 may be first mixing BASF polymerizable nematic liquid crystal LC-1057 (about 3 g) and Nematel dichroic dyes AB4 and AZO1 (3:2, about 0.12 g in total). And dissolved in toluene and cyclohexanone solvent (4:1, a total of about 7 grams), and then coated on the alignment treated substrate by spin coating (for example, cellulose triacetate plate ( TAC plate), whose plane has a phase retardation (Ro) < 10 nm and a phase retardation of its thickness (Rth) = 55 nm), and is then cured by irradiation with a UV (ultraviolet) lamp of 100 mW/cm ² . Alternatively, the linear polarizing layer 211 may be formed by mixing an iodide ion complex or a dye into, for example, a polyvinyl alcohol (PVA) film and stretching the polyvinyl alcohol film, or the linear polarizing layer 211 may also include an iodide ion. A dye layer of a complex or a dichroic dye.

The single optically active liquid crystal layer 214 as described above may include liquid crystal (LC) and a light crystal (Chiral), and the liquid crystal of the single optical liquid crystal layer 214 may be a nematic liquid crystal or a smectic liquid crystal. Or a mixture of the two. For example, an example of a method for preparing the single optically active liquid crystal layer 214 may be to first mix BASF polymerizable nematic liquid crystal LC-242 (about 2 g) with BASF dextrorotatory compound LC-756 (about 0.004 g). A solvent (4:1, a total of about 8 g) of toluene and cyclohexanone was applied onto the coated linearly polarizing layer by spin coating (about 650 rpm), followed by 100 mW/cm ² . The UV (ultraviolet) lamp is cured by irradiation. For another example, a solvent of BASF polymerizable nematic liquid crystal LC-242 (about 2 g) and BASF dextrorotatory compound LC-756 (about 0.005 g) in toluene and cyclohexanone (4: 1, a total of about 8 g), followed by spin coating (rotation speed of about 550 rpm) on the coated linear polarizing layer 211, followed by irradiation with a 100 mW/cm ² UV (ultraviolet) lamp. In addition, it should be noted that the method of the present disclosure can also be reversed, that is, the line polarizing layer 211 can also be formed directly on the single optically active liquid crystal layer 214.

Please refer to FIG. 2, which is a schematic diagram illustrating the liquid crystal structure inside the single optically active liquid crystal layer formed on the linear polarizing layer of the present disclosure. As shown in FIG. 2, the liquid crystal and the optical rotator of the single optically active liquid crystal layer 214 constitute a twisted structure, and the pitch of the twisted structure can correspond to an infrared spectrum section or an ultraviolet spectrum section.

Specifically, in the case of a nematic liquid crystal, the single optical liquid crystal layer 214 Each of the liquid crystal molecules has a twisted structure, and the optically active substance aligns the liquid crystal molecules of the nematic liquid crystal in a thickness direction of the single optically active liquid crystal layer 214, thereby causing the line incident from the linear polarizing layer 211 to be polarized (incident direction I). The left-handed (or right-handed) circularly polarized light, that is, the single optically-polarized liquid crystal layer 214 has an optical conversion characteristic corresponding to a quarter phase retardation of 45° of the angle of the linearly polarizing layer, wherein the linear polarizing layer 211 and the single optically active liquid crystal layer 214 Forming an optical contact surface, the first layer of molecules contacting the single optically active liquid crystal layer of the contact surface is oriented in the axial direction of the absorption axis from the linear polarizing layer 211, that is, the linear polarizing layer 211 and the single optically active liquid crystal Layers 214 are in direct and direct contact.

The phase retardation (Γ) of the single optically active liquid crystal layer 214 can be calculated by the equation (1), and its torsional structure

Where Δn is the birefringence, λ is the wavelength, and d is the thickness. When the optical axis at the exit of the single optically active liquid crystal layer 214 forms an angle Φ (rotation angle) with the optical axis of the incident light, the present disclosure calculates at least one of the phase delay Γ and the rotation angle Φ by finite element analysis. For the range, the parameters of the parameter S ₃ in the Stocks vector in the range of 0.9 to 1 or -0.9 to -1 can be obtained. Wherein, in the Stokes parameter, S ₃ represents the intensity difference of the left and right circular polarization components, and when S ₃ =0, it is a linear polarization state, and when S ₃ =±1, it is a circular polarization state. Geometrically, it can also be explained by the ellipticity that S _{3 is} associated with the polarization state. Of course, in theory, S ₃ should be closer to 1 to represent the closer to the circularly polarized state, but in fact, S ₃ is also practical in the range of 0.9 to 1 or -0.9 to -1, and therefore, in the premise of meeting the above range. Next, the present disclosure may have a plurality of sets of ranges of phase delays 旋转 and rotation angles Φ. In particular, the phase delay Γ of the present disclosure may range from 0.181 λ to 0.546 λ, and the rotation angle Φ may range between 0.18 π to 0.55 π or -0.18 π to -0.55 π. Furthermore, the phase delay Γ of the present disclosure may range from 0.245 λ to 0.473 λ, and the rotation angle Φ may range from 0.25 π to 0.47 π or between -0.25 π to -0.47 π. . That is to say, the present disclosure adjusts parameters such as birefringence and/or thickness depending on the wavelength of light required, so that the phase delay falls within the above range.

As can be seen from Table 1 below, the samples 1 to 13 of the present disclosure can obtain the measured phase-polarized light conversion rate according to the phase retardation Γ obtained by the thickness d of the single optically-crystal liquid crystal layer and the range of the twisted angle Φ. % (that is, the ratio of the linear polarized light emitted by the polarized light to the circularly polarized light) is in accordance with the S ₃ result of the simulation calculation.

As can be seen from Table 2 below, Examples 1 and 2 of the present disclosure (linear polarizing layers using dyes and polymeric liquid crystals) and Examples 3 and 4 (using an iodide ion complex compound mixed with a linear polarizing layer such as a polyvinyl alcohol film) Comparative Example 1 with the prior art (using a 1/4 λ wave plate of a 45-degree angle cut by a JSR company model RJD-1400, and a linear polarizing layer using a dye and a polymerized liquid crystal with a UV optical adhesive) and a comparative example 2 (Compared with a 1/4 λ wave plate of a 45-degree angle cut by a JSR company model RJD-1400, and a UV optical adhesive is used to mix an iodide ion complex into a linear polarizing layer such as a polyvinyl alcohol film) Examples 1 to 4 of the present disclosure can achieve comparison with the prior art in the tests of the reflection value (R%) and the penetration of the film (T%) measured on the OLED backlight panel under ambient light. Close reflection value and penetration. In addition, the thickness of the anti-ambient light reflecting film of the present disclosure is much thinner than that of the prior art. For example, in the case of a coated linear polarizing layer, the thickness of Example 1-2 can be reduced from 31 μm to 5 μm as compared with Comparative Example 1. And no need to align. In the case of an iodine-based polarizing layer, examples 2-4 and Compared to Comparative Example 2, the thickness thereof can be reduced from 209 μm to 183 μm, and no alignment is required.

Please refer to FIG. 3, which illustrates the spectrum of the visible light band of the single optically active liquid crystal layer of the present disclosure. As shown in FIG. 3, a single optically active liquid crystal layer of the present disclosure may have a value of 0.9 to ₃ S 1 at a wavelength between about 475nm to 675nm.

Referring to FIG. 4A, which is a cross-sectional view of another aspect of the anti-ambient light reflecting film of the present disclosure, the anti-ambient light reflecting film 21 includes a linear polarizing layer 211 and a single optically active liquid crystal layer 214a contacting the in-line polarizing layer 211. And a 1/4 λ wave plate 216 having no optical rotation characteristics formed on the single optical liquid crystal layer 214a. The single optically active liquid crystal layer 214a can convert the linearly polarized light that has passed through the linear polarizing layer 211 and is incident on the single optically active liquid crystal layer 214a into circularly polarized light, and has an optical conversion characteristic of 1/2 phase retardation, and the 1/4 λ wave plate 216 The optical axis is parallel to the optical axis of the linear polarizing layer 211 and does not have optical rotation characteristics. The material of the linearly polarizing layer 211 as described above may include a dichroic dye and a polymerizable liquid crystal, and the polymerizable liquid crystal may be formed by polymerizing a lyotropic liquid crystal. For example, an example of the method of manufacturing the linear polarizing layer 211 may be a mixture of BASF polymerizable nematic liquid crystal LC 1057 (3 g) and Nematel dichroic dyes AB4 and AZO1 at a ratio of 3:2 (0.12 g), and dissolved in 7 g. 4:1 mixed solvent of toluene and cyclohexanone, and then coated on the alignment treated substrate by spin coating, and then cured by irradiation with a 100 mW/cm ² UV (ultraviolet) lamp to prepare a linear polarizing layer with linear polarization. 211, and the polarization effective range of the linear polarizing layer 211 covers a wavelength between 450 and 650 nm. Alternatively, the linear polarizing layer 211 may be formed by mixing an iodide ion complex or a dye into, for example, a polyvinyl alcohol (PVA) film and stretching the polyvinyl alcohol film, or the linear polarizing layer 211 may also include an iodide ion. A dye layer of a complex or a dichroic dye.

The single optically active liquid crystal layer 214a as described above may include liquid crystal (LC) crystals and a chiral, and the liquid crystal of the single optically active liquid crystal layer 214 may be a nematic liquid crystal or a smectic. Liquid crystal or a mixture of the two. For example, an example of a method for producing a single optically active liquid crystal layer 214 may be LC-756 (0.006 g) with BASF polymerizable nematic liquid crystal 242 (4 g) and BASF dextrorotatory compound, dissolved in 6 g of 4:1 toluene and cyclohexene. The ketone mixed solvent was then spin-coated on the linear polarizing layer 211, and then cured by irradiation with a 100 mW/cm ² UV (ultraviolet) lamp to complete a single optically active liquid crystal layer 214a having an optical conversion characteristic equivalent to 1/2 phase retardation.

An example of the preparation method of the 1/4 λ wave plate 216 as described above may be a BASF polymerizable nematic liquid crystal LC 242 (2 g), and dissolved in 8 g of a mixed solvent of 4:1 toluene and cyclohexanone, and then rotated. The coating method was applied to a single optically active liquid crystal layer 214a, and then cured by irradiation with a 100 mW/cm ² UV (ultraviolet) lamp to complete a 1/4 λ wave plate 216 having an optical conversion characteristic equivalent to 1/4 phase retardation. Thus, after forming a single optically active liquid crystal layer 214a corresponding to the optical conversion characteristic of 1/2 phase retardation and a 1/4 λ wave plate 216 corresponding to the optical conversion characteristic of 1/4 phase retardation, the linear polarizing layer 211 is on the line. An optically active liquid crystal composite layer having an optical conversion characteristic equivalent to a 3/4 phase retardation is formed. In addition, it should be noted that the method of the present disclosure can also be reversely operated to form a cellulose triacetate (TAC) substrate which does not need to be aligned in the same direction as the linear polarizing layer 211 on the coated linear polarizing layer 211. In the case, the material of the single optically active liquid crystal layer 214a can be coated on the TAC substrate by spin coating, and cured by irradiation with a 100 mW/cm ² UV (ultraviolet) lamp, so that the polarizing layer along the line can be made. The first surface molecular arrangement of the single optically active liquid crystal layer 214a can be aligned with the polarization direction of the polarized light emitted from the linear polarizing layer 211, and the single optically active liquid crystal layer 214a does not need to be formed on the contact surface formed between the 211 and the single optically active liquid crystal layer 214a. Cut. A 1/4 λ wave plate 216 is then formed on the single optically active liquid crystal layer 214a. The phase delay Γ of the present disclosure may range from 0.55 λ to 0.76 λ, and the rotation angle Φ may range between 0.6 π to 0.85 π or -0.6 π to -0.85 π. That is to say, the present disclosure adjusts parameters such as birefringence and/or thickness depending on the wavelength of light required, so that the phase delay falls within the above range.

As can be seen from Table 3 below, the optically active liquid crystal composite layer of another aspect of the present disclosure can achieve a circular polarization conversion ratio of 93% or more (i.e., S ₃ is 0.9 to 1).

Please refer to FIG. 4B, which illustrates an optically active liquid crystal composite layer composed of a single optically active liquid crystal layer and a 1/4 λ wave plate which rotates the optical axis of the linearly polarized light by 45° (ie, the anti-ambient light reflection disclosed in FIG. 4A). A schematic diagram of the phase difference Re of each band λ in the visible light band of the 1/4 λ wave plate 216 and the single optically active liquid crystal layer 214a) in another aspect of the film. As can be seen from Fig. 4B, the examples of the optically active liquid crystal composite layer of this aspect (samples 1 to 3) have a value of the phase difference Re of the 1/4 λ wave plate close to the ideal between wavelengths of about 500 nm to 650 nm. , that is, about 0.25 plus or minus 0.5, so the optically active liquid crystal composite layer composed of a single optically active liquid crystal layer and a 1/4 λ wave plate which rotates the optical axis of the linearly polarized light by 45° can also reach the third image at a wavelength of about 500 nm to 650 nm. The circular polarization conversion ratio of the single optically active liquid crystal layer (i.e., 90% or more, corresponding to S ₃ being 0.9 or more).

Please refer to FIG. 5 , which is a schematic diagram of the phase difference Re corresponding to each band λ in the visible light band of another embodiment of the composite layer of the single optically active liquid crystal layer and the 1/4 λ wave plate disclosed in the present disclosure. In this other embodiment, the phase delay Γ of the present disclosure may range from 0.92 λ to 1.01 λ, and the rotation angle Φ may range from 0.21 π to 0.29 π or -0.21 π to -0.29. Between π. That is to say, the present disclosure adjusts parameters such as birefringence and/or thickness depending on the wavelength of light required, so that the phase delay falls within the above range. As shown in FIG. 5, the optically active liquid crystal composite layer composed of a single optical liquid crystal layer and a 1/4 λ wave plate is disclosed in comparison with an ideal 1/4 λ wave plate having a 1/4 λ phase retardation. In the visible light band (about 400 nm to 800 nm), each band λ has a value of a phase difference Re of an ideal 1/4 λ wave plate, that is, about 0.25, that is, the aforementioned S ₃ (λ at visible wavelength). )>0.95.

Please refer to FIGS. 6A-6C , which are cross-sectional views of the linear polarizing layer of the present disclosure including the polymer layer and the anti-ambient light reflecting film of the supporting layer. As shown in FIG. 6A, the linear polarizing layer 211 may include a polymer layer 2111 (for example, a polyvinyl alcohol film containing an iodide ion complex or a dichroic dye) and two formed on both sides of the polymer layer 2111 to be high. The support layer 2112 is sandwiched by the molecular layer 2111, wherein the material of the support layer 2112 is cellulose triacetate (TAC), and the single optical liquid crystal layer 214 is contacted to form on the support layer 2112. Alternatively, as shown in FIG. 6B, the linear polarizing layer 211 includes a polymer layer 2111 and a support. The layer 2112 is sandwiched between the polymer layer 2111 and the single optically active liquid crystal layer 214. Alternatively, as shown in FIG. 6C, the linear polarizing layer 211 includes a polymer layer 2111 and a supporting layer 2112, and the polymer layer 2111 is interposed between the supporting layer 2112 and the single optically active liquid crystal layer 214.

It should be noted that the optical axis of the linearly polarizing layer used in the present specification means that when a light is incident on the linear polarizing layer, only light in a direction parallel to the optical axis can pass. The light absorption axis of the linearly polarizing layer used in the present specification means that when a light is incident on the linear polarizing layer, only light perpendicular to the direction of the light absorption axis can pass. The optical axis of the single optically active liquid crystal layer used in the present specification means the long axis direction of the liquid crystal molecules in the single optically active liquid crystal layer.

Furthermore, the optical axis of the 1/4-free λ wave plate used in the present specification means that when a linear ray is incident on the 1/4 λ wave plate, the vibration of the linear polarization can be substantially decomposed into parallel and vertical. In the direction of the optical axis. When the linear polarization is parallel or perpendicular to the optical axis (ie, the linear polarization direction of the line and the optical axis is 0 or 90 degrees), the original linear polarization is maintained due to the zero amplitude in the other direction (ie, It is not decomposed into two directions); when the angle between the linear polarization and the optical axis is 45 degrees, the amplitude of the two directions is equalized, so that circular polarization is formed; but if it is other angles, it will be decomposed. The amplitudes in the two directions are different and become elliptically polarized.

In summary, the present disclosure can be formed on the linear polarizing layer by directly contacting a single optically active liquid crystal layer or an optically active liquid crystal composite layer composed of a single optically active liquid crystal layer and a 1/4 λ wave plate, as compared with the prior art. Therefore, in the prior art, when the linear polarizing plate and the 1/4 λ wave plate are bonded, the material and process waste caused by cutting the linear polarizing plate or the 1/4 λ wave plate can be avoided, and the continuous production can be performed in a roll type. It can reduce the thickness of the anti-ambient light reflecting film.

The above embodiments are intended to illustrate the principles of the disclosure and its functions, and are not intended to limit the disclosure. Any person skilled in the art can modify the above embodiments without departing from the spirit and scope of the disclosure. Therefore, the scope of protection of the present disclosure should be as set forth in the scope of the patent application described later.

21‧‧‧Anti-environmental light reflecting film

211‧‧‧Line polarizer

214‧‧‧Single optically active liquid crystal layer

Claims (18)

An anti-ambient light reflecting film comprising: a linear polarizing layer; and a single optically active liquid crystal layer formed on the linear polarizing layer to form a contact surface between the linear polarizing layer and the single optically active liquid crystal layer; Along the contact surface, the first layer of molecules of the single optically active liquid crystal layer is aligned in the axial direction of the light absorption axis of the linear polarizing layer without a deflection angle. An anti-ambient light reflecting film comprising: a linear polarizing layer; a 1/4 λ wave plate, wherein an optical axis of the 1/4 λ wave plate is parallel to an absorption axis of the linear polarizing layer; and a single optically active liquid crystal layer Between the line polarizing layer and the 1/4 λ wave plate, and a contact is formed on the 1/4 λ wave plate; wherein the 1/4 λ wave plate and the single optically active liquid crystal layer are used for making an incident The line polarized light is converted into a circular polarized light. The anti-ambient light reflecting film according to claim 1 or 2, wherein the single optically active liquid crystal layer has a phase retardation and a rotation angle characteristic, and parameters in the Stokes vector of the single optical liquid crystal layer S ₃ is in the range of 0.9 to 1 or ~0.9 to -1 by calculating at least one of the phase delay and the range of the rotation angle, and the parameter S ₃ represents the intensity difference of the left and right circular polarization components. An anti-ambient light reflecting film according to claim 3, wherein The phase delay is in the range of 0.181 λ~0.546 λ, and the rotation angle is in the range of 0.18 π~0.55 π or in the range of -0.18 π~-0.55 π. The anti-ambient light reflecting film according to claim 3, wherein the phase delay is in the range of 0.245 λ~0.473 λ, and the rotation angle is 0.25 π~0.47 π or -0.25 π~-0.47 π The scope. The anti-ambient light reflecting film according to claim 1 or 2, wherein the single optically active liquid crystal layer comprises a liquid crystal and an optical rotator which constitute a twisted structure, and the pitch of the twisted structure corresponds to an infrared spectrum or an ultraviolet spectrum . The anti-ambient light reflecting film according to claim 6, wherein the liquid crystal is a nematic liquid crystal, a smectic liquid crystal or a mixture of the two. The anti-ambient light reflecting film according to claim 1 or 2, wherein the linear polarizing layer comprises a dichroic dye and a polymeric liquid crystal. The anti-ambient light reflecting film according to claim 8, wherein the polymerizable liquid crystal is formed by polymerizing a lyotropic liquid crystal. The anti-ambient light reflecting film of claim 1 or 2, wherein the linear polarizing layer comprises a dye layer. The anti-ambient light reflecting film according to claim 10, wherein the dye layer is an iodide ion complex or a dichroic dye. The anti-ambient light reflecting film of claim 1 or 2, wherein the linear polarizing layer comprises a polymer layer and at least one supporting layer formed on the polymer layer, so that the at least one supporting layer Sandwiched between the polymer layer and the single optically active liquid crystal layer, or the polymer layer And sandwiching between the support layer and the single optically active liquid crystal layer, or the at least one support layer is formed on both sides of the polymer layer to sandwich the polymer layer. The anti-ambient light reflecting film according to claim 12, wherein the material of the polymer layer is polyvinyl alcohol (PVA), and the material of the support layer is cellulose triacetate (TAC). The anti-ambient light reflecting film according to claim 2, wherein the single optically active liquid crystal layer has an optical conversion characteristic of rotating the optical axis of the linear polarization by 45°. The anti-ambient light reflecting film of claim 14, wherein the single optically active liquid crystal layer has a phase retardation and a rotation angle characteristic, and the phase retardation is in a range of 0.55 λ to 0.76 λ, and the rotation angle is Between 0.6 π and 0.85 π or -0.6 π to -0.85 π. The anti-ambient light reflecting film according to claim 2, wherein the 1/4 λ wave plate does not have an optical rotation characteristic. The anti-ambient light reflecting film of claim 2, wherein the 1/4 λ wave plate and the single optically active liquid crystal layer have optical conversion characteristics for converting the linearly polarized light into the circularly polarized light, and the single optical rotation The parameter S ₃ in the Stokes vector of the liquid crystal layer is greater than 0.95, and the parameter S ₃ represents the intensity difference of the left and right circularly polarized components. The anti-ambient light reflecting film according to claim 17, wherein the single optically active liquid crystal layer has a phase retardation and a rotation angle characteristic, and the phase delay is in a range of 0.92 λ to 1.01 λ, and the rotation angle is It is in the range of 0.21 π to 0.29 π or -0.21 π to -0.29 π.