Polarizing plate and display

Abstract

A polarizing plate includes a first polarizing layer set. The first polarizing layer set includes a first transparent layer and a second transparent layer. The first transparent layer has a first X-direction refractive index and a first Y-direction refractive index. The second transparent layer is stacked on the top surface of the first transparent layer. The second transparent layer has a second X-direction refractive index and a second Y-direction refractive index. The first Y-direction refractive index is different from the second Y-direction refractive index, and the first X-direction refractive index is substantially the same as the second X-direction refractive index. The second transparent layer has a first transparent medium and a second transparent medium arranged in a transverse direction, and a third refractive index of the first transparent medium is different from a fourth refractive index of the second transparent medium.

Description

TECHNICAL FIELD

[0001] The present application relates to a polarizer, in particular, a polarizer with the advantages of both metal wire grid polarizer and multilayer film reflective polarizer. BACKGROUND

[0002] The existing reflective polarizing film technology can be divided into metal wire grid polarizer and multilayer film reflective polarizer. The metal wire grid polarizer has good optical extinction rate, but the light efficiency is poor due to the absorption rate. The multilayer film reflective polarizer has little difference in birefringence in two directions, and needs to stack hundreds of film pieces, and the extinction rate of TE and TM wave transmittance is different. SUMMARY

[0003] In view of the shortcomings of the prior art, the present application provides a polarizer, which comprises a first polarizing layer group, the first polarizing layer group comprising: a first transparent layer and a second transparent layer. The first transparent layer has a first X-direction refractive index and a first Y-direction refractive index. The second transparent layer is stacked on the top surface of the first transparent layer, and the second transparent layer has a second X-direction refractive index and a second Y-direction refractive index, the first Y-direction refractive index is different from the second Y-direction refractive index, and the first X-direction refractive index is substantially the same as the second X-direction refractive index. The second transparent layer has a first transparent medium and a second transparent medium arranged transversely, and a third refractive index of the first transparent medium is different from a fourth refractive index of the second transparent medium.

[0004] In some embodiments, the present application provides a display, which comprises a display body and a polarizer. The polarizer is arranged in the display body, and the polarizer comprises a first polarizing layer group, the first polarizing layer group comprising: a first transparent layer and a second transparent layer. The first transparent layer has a first X-direction refractive index and a first Y-direction refractive index. The second transparent layer is stacked on the top surface of the first transparent layer, and the second transparent layer has a second X-direction refractive index and a second Y-direction refractive index, the first Y-direction refractive index is different from the second Y-direction refractive index, and the first X-direction refractive index is substantially the same as the second X-direction refractive index. The second transparent layer has a first transparent medium and a second transparent medium arranged transversely, and a third refractive index of the first transparent medium is different from a fourth refractive index of the second transparent medium.

[0005] According to the above description, the present application has the following advantages: (1) the absorption of light by metal can be reduced. (2) Since the refractive indices in X and Y directions are different, when multiple polarizing layer groups are stacked, the number of stacked layers can be effectively reduced to reduce the overall thickness. (3) The extinction rate can be comparable to that of metal wire grid polarizer, and better than that of multilayer film polarizer.

[0006] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but is not limited to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0008] Figure 2 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0009] Figure 3 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0010] Figure 4 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0011] Figure 5 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0012] Figure 6 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0013] Figure 7 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0014] Figure 8 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0015] Figure 9 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0016] Figure 9A A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown. Figure 9 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0017] Figure 10 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0018] Figure 11 A schematic diagram of a first polarizer layer group in some embodiments of the present application is shown.

[0019] Figure 12 Fig. 3 shows the experimental data of the absorption of TE and TM waves at 0 and 45 degrees of incidence for three first polarizer layer sets stacked on top of each other in some embodiments of the application.

[0020] Wherein the reference signs are:

[0021] 10: first polarizer layer set

[0022] 11: first transparent layer

[0023] 12: second transparent layer

[0024] 121: first transparent medium

[0025] 122: second transparent medium

[0026] 20: second polarizer layer set

[0027] 21: first transparent layer

[0028] 22: second transparent layer

[0029] 221: first transparent medium

[0030] 222: second transparent medium

[0031] D: distance

[0032] P: period of structure

[0033] n3: third refractive index

[0034] n4: fourth refractive index

[0035] n5: fifth refractive index

[0036] n TM1 : first X-direction refractive index

[0037] n TE1 : first Y-direction refractive index

[0038] n TM2 : second X-direction refractive index

[0039] n TE2 : second Y-direction refractive index

[0040] n L : sixth refractive index

[0041] n H : seventh refractive index DETAILED DESCRIPTION

[0042] The structural principle and working principle of the present application will be described in detail below with reference to the accompanying drawings.

[0043] Referring to Figure 1 The present application relates to a polarizing plate, which includes a first polarizing layer set 10 including a first light-transmissive layer 11 and a second light-transmissive layer 12.

[0044] Referring to Figure 1 As shown, the first light-transmissive layer 11 has a first X-direction refractive index n TM1 and a first Y-direction refractive index n TE1 In some embodiments, the material of the first light-transmissive layer 11 is selected from one of the following groups: dielectric material, glass, silicon, Cyclic olefin copolymer (COC), Cyclic Olefin Polymer (COP), Polycarbonate (PC), Polyethylene terephthalate (PET), Polyimide (PI), Polyether sulfone (PES), Polyethylene naphthalate (PEN), Cellulose triacetate (TAC), and Polymethyl methacrylate (PMMA). The X-direction refractive index is the refractive index of the TM (Transverse Magnetic) wave direction, and the Y-direction refractive index is the refractive index of the TE (Transverse Electric) wave direction. Since the first light-transmissive layer 11 is a homogeneous material, the first X-direction refractive index n TM1 is the same as the first Y-direction refractive index n TE1 .

[0045] Referring to Figure 1 As shown, the second light-transmissive layer 12 is stacked on the top surface of the first light-transmissive layer 11, and has a first light-transmissive medium 121 and a second light-transmissive medium 122 arranged in a transverse direction. As shown, the number of the first light-transmissive medium 121 and the second light-transmissive medium 122 is multiple, and each first light-transmissive medium 121 and each second light-transmissive medium 122 are arranged in an interlaced and close manner to form the second light-transmissive layer 12. The first light-transmissive medium 121 has a third refractive index n3, the second light-transmissive medium 122 has a fourth refractive index n4, the third refractive index n3 is different from the fourth refractive index n4, and the second light-transmissive layer 12 has a second X-direction refractive index n TM2 and a second Y-direction refractive index n TE2, the first Y-direction refractive index n TE1 , the second Y-direction refractive index n TE2 , the first X-direction refractive index n TM1 , the second X-direction refractive index n TM2 .

[0046] Since the second light-transmitting layer 12 has the first light-transmitting medium 121 and the second light-transmitting medium 122 arranged side by side, the second X-direction refractive index n TM2 and the second Y-direction refractive index n TE2 of the second light-transmitting layer 12 are equivalent refractive indices of the first light-transmitting medium 121 and the second light-transmitting medium 122. Therefore, the calculation formula of the second X-direction refractive index n TM2 is shown in the following formula 1, and the calculation formula of the second Y-direction refractive index n TE2 is shown in the following formula 2, wherein the total length of the first light-transmitting medium 121 and the second light-transmitting medium 122 adjacent to the first light-transmitting layer 11 is defined as a structure period P, and the ratio of the length of the first light-transmitting medium 121 adjacent to the second light-transmitting layer 12 to the structure period P is a proportion f. As can be seen from the formulas 1 and 2, when the materials of the first light-transmitting medium 121 and the second light-transmitting medium 122 are fixed, the second X-direction refractive index n TM2 and the second Y-direction refractive index n TE2 can be adjusted by adjusting the proportion of the first light-transmitting medium 121, so that the first Y-direction refractive index n TE1 is different from the second Y-direction refractive index n TE2 , the first X-direction refractive index n TM1 is substantially the same as the second X-direction refractive index n TM2 . Alternatively, when the proportion of the first light-transmitting medium 121 is fixed and the materials of the first light-transmitting medium 121 and the second light-transmitting medium 122 are adjusted, the second X-direction refractive index n TM2 and the second Y-direction refractive index n TE2 can also be adjusted.

[0047]

[0048] As described above, when the wavelength of the incident light is much larger than the structure period P, the polarizer has relative equivalent refractive indices in the X-direction and the Y-direction, and an equivalent birefringent material can be constructed, so that the present application has the following advantages: (1) the absorption of light by the metal can be reduced. (2) Since the refractive indices in the X-direction and the Y-direction are different, when a plurality of first polarizing layer groups 10 are stacked with each other, the number of stacked layers can be effectively reduced to reduce the overall thickness. (3) The extinction ratio can be comparable to that of a metal wire grid polarizer, and better than that of a multilayer film polarizer.

[0049] In some embodiments, as shown in the following formula 3, under the condition that the incident angle is 0°, the thickness h1 of the first light-transmitting layer 11 is four times the first Y-direction refractive index nTE1 The product of the two factors satisfies the wavelength of the incident light, as shown in Formula 4 below. The thickness h2 of the second light-transmitting layer 12 is four times that of the second light-transmitting layer 12, and the refractive index n in the second Y direction is... TE2 The product of these terms satisfies the wavelength of the incident light. Here, m is any integer, such as 1, 2, 3, ..., λ0 is the wavelength of the incident light, and n... TE2 The refractive index n in the second Y direction TE2 n TE1 The refractive index n in the first Y direction TE1 .

[0050]

[0051] In some embodiments, the first light-transmitting medium 121 and the second light-transmitting medium 122 are each made of a dielectric material, such as, but not limited to, silicon dioxide (SiO2), tantalum pentoxide (Ti2O5), titanium dioxide (TiO2), silicon (Si), gallium nitride (GaN), gallium phosphide (GaP), and gallium arsenide (GaAs). Alternatively, one of the first light-transmitting medium 121 and the second light-transmitting medium 122 may be air.

[0052] In some embodiments, the first light-transmitting layer 11 has a fifth refractive index n5, which is substantially the same as the third refractive index n3 or the fourth refractive index n4, i.e., the fifth refractive index n5 = the third refractive index n3 ≠ the fourth refractive index n4, or the fifth refractive index n5 = the fourth refractive index n4 ≠ the third refractive index n3. In some embodiments, the third refractive index n3, the fourth refractive index n4, and the fifth refractive index n5 are all different, and the third refractive index n3 > the fifth refractive index n5 > the fourth refractive index n4, or the fourth refractive index n4 > the fifth refractive index n5 > the third refractive index n3.

[0053] Please see Figure 2 As shown, in actual implementation, the present invention consists of multiple identical first polarization layer groups 10 stacked together, and the first light-transmitting layer 11 has a refractive index n in the first X direction. TM1 Refractive index n in the first Y direction TE1 Both have the same fifth refractive index n5, and the first light-transmitting medium 121 and the second light-transmitting medium 122 of the second light-transmitting layer 12 are equivalent to the second X-direction refractive index n. TM2 and the refractive index n in the second Y direction TE2 In order to construct an equivalent birefringent material, the proportion f needs to be adjusted so that the refractive index n in the first X direction is... TM1 With the refractive index n in the second X direction TM2 Similarly, the refractive index n in the first Y direction TE1 The refractive index is different from that in the second Y direction. TM2 To further highlight the difference in refractive index, since the refractive index n in the first X direction... TM1The refractive index n in the first Y direction TE1 and the refractive index n in the second X direction TM2 They are all the same, therefore Figure 2 It is designated as the sixth refractive index n L As for the refractive index n in the second Y direction TE2 It is then defined as the seventh refractive index n H In this way, by Figure 2 It can be clearly shown that the refractive index of the polarizer is the same in the X direction, while the refractive index in the Y direction is two alternating refractive indices, and the thickness of each first light-transmitting layer 11 and each second light-transmitting layer 12 in the Y direction satisfies one-quarter of the incident light wavelength.

[0054] Please see Figure 1 As shown, in some embodiments, the first light-transmitting layer 11 is made of polymethyl methacrylate (PMMA), the first light-transmitting medium 121 is made of gallium phosphide (GaP), and the second light-transmitting medium 122 is made of air. The structural period is 100 nm, the proportion f is 0.6, and assuming the incident light center wavelength is 550 nm, the refractive index n in the second X direction is... TM2 Approximately 1.4901, refractive index n in the second Y direction TE2 Approximately 2.7476. According to formulas 3 and 4, the thickness of the first transparent layer 11 is approximately 92 nm, and the thickness of the second transparent layer 12 is approximately 50 nm. Please refer to [link / reference]. Figure 6 The image shows experimental data on the transmittance of TM and TE waves after three and eleven first polarization layer groups 10 are stacked together in this embodiment. Figure 6 It can be seen that, under the condition that the incident light is visible light, the transmittance of TE waves is significantly higher than that of TM waves. Please refer to [link / reference]. Figure 7 The image shows experimental data on the reflectivity of TM and TE waves after three and eleven first polarization layer groups 10 are stacked together in this embodiment. Figure 7 It can be seen that, under the condition that the incident light is visible light, the transmittance of TM waves is significantly higher than that of TE waves. Please refer to [link / reference]. Figure 8 The figure shows experimental data on the absorption rates of TM and TE waves after three first polarization layer groups 10 are stacked together and eleven first polarization layer groups 10 are stacked together in this embodiment. Figure 8 It is known that when the incident light is visible light, the absorption rates of TE and TM waves are almost zero. Please refer to [link / reference]. Figure 9 The figure shows experimental data on the extinction rate of incident light after three first polarization layer groups 10 and eleven first polarization layer groups 10 are stacked together in this embodiment. Since... Figure 9 In the experimental data diagram of the extinction rate of incident light, the three first polarization layer groups 10 are stacked together, resulting in a proportional relationship. Figure 9The experimental data plots for the three first polarization layer groups 10 are quite close to the X-axis; please refer to this section. Figure 9A As shown, experimental data graphs for the three first polarization layer groups 10 are displayed at different scales. Figure 9 and Figure 9A It can be seen that the higher the number of layers in the first polarization layer group 10, the better the extinction rate of the incident light. Furthermore, Figure 10 to Figure 12 This is a graph showing experimental data after three first polarization layer groups were stacked together. Figure 10 The graph shows experimental data on the transmittance of TE and TM waves at incident angles of 0 degrees and 45 degrees. Figure 11 The graph shows the experimental data of reflectivity for TE and TM waves at incident angles of 0 degrees and 45 degrees. Figure 12 The graph shows experimental data on the absorption rates of TE and TM waves at incident angles of 0° and 45°. As can be seen from the graph, the absorption rate of the polarizer in the visible light band is almost zero. The extinction ratio refers to the ratio between the transmittance of TE and TM waves, i.e.,

[0055] In some embodiments, multiple identical first polarization layer groups 10 are stacked vertically on top of each other. After stacking, the first light-transmitting medium 121 of each first polarization layer group 10 is located at the same horizontal position, and the second light-transmitting medium 122 of each first polarization layer group 10 is also located at the same horizontal position. Please refer to [link to documentation]. Figure 3 As shown, in some embodiments, a second polarization layer group 20 is further provided on the top surface of the first polarization layer group 10. The first polarization layer group 10 and the second polarization layer group 20 have the same structure, that is, the second polarization layer group 20 also has a first light-transmitting layer 21 and a second light-transmitting layer 22, and the second light-transmitting layer 22 includes a first light-transmitting medium 221 and a second light-transmitting medium 222. The horizontal distance D between the horizontal positions of the first light-transmitting medium 121 of the first polarization layer group 10 and the first light-transmitting medium 221 of the second polarization layer group 20 is less than the structural period P. In this embodiment, at least one of the first light-transmitting medium 121 and the second light-transmitting medium 122 is rectangular. The diagram shows that both the first light-transmitting medium 121 and the second light-transmitting medium 122 are rectangular, and the structural period P is less than 200 nm. The thicknesses of the first light-transmitting layer 11 and the second light-transmitting layer 12 both satisfy a quarter wavelength requirement. Figure 3 It is understood that this method creates an interlaced arrangement effect in the structure of the polarizer, and this interlaced arrangement effect does not affect the optical effects of the polarizer (i.e., transmittance, reflectance, extinction rate, and absorptivity). Furthermore, this embodiment can also be further implemented such that the refractive index of the first light-transmitting layer 11 is connected to either the first light-transmitting medium 121 or the second light-transmitting medium 122, or that the refractive indices of the first light-transmitting layer 11, the first light-transmitting medium 121, and the second light-transmitting medium 122 are all different.

[0056] Referring to Figure 4 In some embodiments, one of the first light-transmissive medium 121 or the second light-transmissive medium 122 is triangular in cross-sectional view to form a triangular structure, Figure 4 In some embodiments, the first light-transmissive medium 121 and the second light-transmissive medium 122 are both triangular structures. In this embodiment, the thicknesses of the first light-transmissive layer 11 and the second light-transmissive layer 12 both satisfy the quarter wavelength, and the overall structure period P is less than 200 nm. In some embodiments, the horizontal position of the first light-transmissive medium 121 of the first polarizing layer group 10 and the horizontal position of the first light-transmissive medium 221 of the second polarizing layer group 20 have a distance D that is less than the structure period P. In this way, the structure of the polarizing plate forms an interlaced arrangement effect, and this interlaced arrangement effect does not affect the optical effects (i.e., transmittance, reflectance, extinction ratio, and absorption) of the polarizing plate. In addition, this embodiment can be further implemented such that the refractive index of the first light-transmissive layer 11 is the same as one of the first light-transmissive medium 121 or the second light-transmissive medium 122, or the refractive indices of the first light-transmissive layer 11, the first light-transmissive medium 121, and the second light-transmissive medium 122 are all different.

[0057] Referring to Figure 5 In some embodiments, one of the first light-transmissive medium 121 or the second light-transmissive medium 122 is trapezoidal in cross-sectional view to form a trapezoidal structure, Figure 5 In some embodiments, the first light-transmissive medium 121 and the second light-transmissive medium 122 are both trapezoidal structures. In this embodiment, the thicknesses of the first light-transmissive layer 11 and the second light-transmissive layer 12 both satisfy the quarter wavelength, and the overall structure period P is less than 200 nm. In some embodiments, the horizontal position of the first light-transmissive medium 121 of the first polarizing layer group 10 and the horizontal position of the first light-transmissive medium 221 of the second polarizing layer group 20 have a distance D that is less than the structure period P. In this way, the structure of the polarizing plate forms an interlaced arrangement effect, and this interlaced arrangement effect does not affect the optical effects (i.e., transmittance, reflectance, extinction ratio, and absorption) of the polarizing plate. In addition, this embodiment can be further implemented such that the refractive index of the first light-transmissive layer 11 is the same as one of the first light-transmissive medium 121 or the second light-transmissive medium 122, or the refractive indices of the first light-transmissive layer 11, the first light-transmissive medium 121, and the second light-transmissive medium 122 are all different.

[0058] In addition, although the above embodiments present the first polarizing layer group 10 and the second polarizing layer group 20, the structures of the first transparent medium 121, 221 or the second transparent medium 122, 222 of both are one of trapezoidal, rectangular, and triangular. However, the arrangement of the present application is not limited to this, and one of the first transparent medium 121 or the second transparent medium 122 of the first polarizing layer group 10 can be trapezoidal, and one of the first transparent medium 221 or the second transparent medium 222 of the second polarizing layer group 20 can be rectangular. Thus, the structure of the first transparent medium 121 and the second transparent medium 122 of the first polarizing layer group 10 is different from the structure of the first transparent medium 221 and the second transparent medium 222 of the second polarizing layer group 20. In addition, when the number of polarizing layer groups is more than three, the structures of the three polarizing layer groups can also be arranged in combination of trapezoidal, rectangular, and triangular.

[0059] In some embodiments, the present application provides a display, which includes a display body, and the above-mentioned polarizing sheet is arranged in the display body. The related embodiments of the polarizing sheet can be referred to the above, and will not be described here again.

[0060] Of course, the present application can have other various embodiments. Those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application. However, these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.

Claims

1. A polarizing plate characterized by comprising: Comprising: a first polarizer layer group, comprising: a first light-transmitting layer having a first X-direction refractive index and a first Y-direction refractive index; and a second light-transmitting layer stacked on a top surface of the first light-transmitting layer, the second light-transmitting layer having a first light-transmitting medium and a second light-transmitting medium arranged in a transverse direction, the first light-transmitting medium and the second light-transmitting medium being arranged in an alternating close arrangement, a third refractive index of the first light-transmitting medium being different from a fourth refractive index of the second light-transmitting medium; equivalent refractive indices of the first light-transmitting medium and the second light-transmitting medium including a second X-direction refractive index and a second Y-direction refractive index, the first Y-direction refractive index being different from the second Y-direction refractive index, the first X-direction refractive index being substantially the same as the second X-direction refractive index; a relationship between the second X-direction refractive index and the third refractive index and the fourth refractive index being: a relationship between the second Y-direction refractive index and the third refractive index and the fourth refractive index being: wherein n TM2 is the second X-direction refractive index, n TE2 is the second Y-direction refractive index, n3 is the third refractive index, n4 is the fourth refractive index, and f is the ratio of the length of the first transparent medium adjacent to the second transparent layer to a structure period.

2. The polarizing plate of claim 1, wherein wherein, under the condition that an incident angle is 0°, a product of four times a thickness of the first light-transmitting layer and the first Y-direction refractive index satisfies a wavelength of incident light; and a product of four times a thickness of the second light-transmitting layer and the second Y-direction refractive index satisfies the wavelength of the incident light.

3. The polarizing plate of claim 2, wherein wherein the first light-transmitting medium and the second light-transmitting medium collectively have the structural period; a second polarizer layer group is further provided on a top surface of the first polarizer layer group, the first polarizer layer group and the second polarizer layer group having the same structure, a distance between a horizontal position of the first light-transmitting medium of the first polarizer layer group and a horizontal position of the first light-transmitting medium of the second polarizer layer group being less than the structural period.

4. The polarizing plate of claim 3, wherein wherein the first X-direction refractive index is the same as the first Y-direction refractive index, and the first X-direction refractive index and the first Y-direction refractive index are substantially the same as the third refractive index or the fourth refractive index.

5. The polarizing plate of claim 4, wherein wherein the first light-transmitting medium has a proportion in the structural period, the second X-direction refractive index and the second Y-direction refractive index being determined according to the proportion, the third refractive index and the fourth refractive index.

6. The polarizing plate according to one or more of claims 1 to 5, wherein wherein the first light-transmitting medium and the second light-transmitting medium collectively have the structural period, the structural period being less than the wavelength of the incident light.

7. The polarizing plate of claim 6, wherein wherein the first light-transmitting medium and the second light-transmitting medium are respectively made of a dielectric material; a material of the first light-transmitting layer is selected from a group consisting of a dielectric material, glass, silicon, cycloolefin copolymer, cycloolefin polymer, polycarbonate, polyethylene terephthalate, polyimide, polyphenylene ether sulfone, polyethylene naphthalate, cellulose triacetate, and polymethyl methacrylate.

8. The polarizing plate of claim 6, wherein wherein the first light-transmitting medium is triangular in a cross-sectional view.

9. The polarizing plate of claim 6, wherein wherein the first light-transmitting medium is trapezoidal in a cross-sectional view.

10. The polarizing plate of claim 6, wherein wherein the first light-transmitting medium is rectangular in a cross-sectional view.

11. A display, characterized by Comprising: a display body; and a polarizer provided in the display body, the polarizer comprising: a first polarizer layer group, comprising: a first light-transmitting layer having a first X-direction refractive index and a first Y-direction refractive index; and a second light-transmitting layer stacked on a top surface of the first light-transmitting layer, the second light-transmitting layer having a first light-transmitting medium and a second light-transmitting medium arranged in a transverse direction, the first light-transmitting medium and the second light-transmitting medium being arranged in an alternating close arrangement, a third refractive index of the first light-transmitting medium being different from a fourth refractive index of the second light-transmitting medium; equivalent refractive indices of the first light-transmitting medium and the second light-transmitting medium including a second X-direction refractive index and a second Y-direction refractive index, the first Y-direction refractive index being different from the second Y-direction refractive index, the first X-direction refractive index being substantially the same as the second X-direction refractive index; A second light-transmissive layer is stacked on the top surface of the first light-transmissive layer. The second light-transmissive layer has a first light-transmissive medium and a second light-transmissive medium arranged in a horizontal direction. The first light-transmissive medium and the second light-transmissive medium are arranged in an interlaced close arrangement. A third refractive index of the first light-transmissive medium is different from a fourth refractive index of the second light-transmissive medium. Equivalent refractive indices of the first light-transmissive medium and the second light-transmissive medium include a second X-direction refractive index and a second Y-direction refractive index. The first Y-direction refractive index is different from the second Y-direction refractive index, and the first X-direction refractive index is substantially the same as the second X-direction refractive index. The second X-direction refractive index is related to the third refractive index and the fourth refractive index as follows: The second Y-direction refractive index is related to the third refractive index and the fourth refractive index as follows: wherein n TM2 is the second X-direction refractive index, n TE2 is the second Y-direction refractive index, n3 is the third refractive index, n4 is the fourth refractive index, and f is the ratio of the length of the first transparent medium adjacent to the second transparent layer to a structure period.

12. The display of claim 11, wherein, Under the condition that the incident angle is 0°, the product of four times the thickness of the first light-transmissive layer and the first Y-direction refractive index satisfies the wavelength of incident light. The product of four times the thickness of the second light-transmissive layer and the second Y-direction refractive index satisfies the wavelength of incident light.

13. The display of claim 12, wherein, The first light-transmissive medium and the second light-transmissive medium have the same structure period. A second polarizing layer group is arranged on the top surface of the first polarizing layer group. The horizontal distance between the first light-transmissive medium of the first polarizing layer group and the first light-transmissive medium of the second polarizing layer group is less than the structure period.

14. The display of claim 13, wherein, The first X-direction refractive index is the same as the first Y-direction refractive index, and the first X-direction refractive index and the first Y-direction refractive index are substantially the same as the third refractive index or the fourth refractive index.

15. The display of claim 14, wherein, The first light-transmissive medium has a proportion in the structure period. The second X-direction refractive index and the second Y-direction refractive index are determined according to the proportion, the third refractive index, and the fourth refractive index.

16. The display of any one of claims 11 to 15, wherein, The first light-transmissive medium and the second light-transmissive medium have the same structure period, and the structure period is less than the wavelength of incident light.

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