Light absorbing structure and display device

Abstract

A light-absorbing structure for a display device includes a light control layer and a first optical compensation film superimposed on the light control layer. The angle between the absorption axis of the light control layer and the normal direction of the light control layer is less than or equal to 10 degrees. The absolute value of the in-plane phase retardation R0 of the first optical compensation film is greater than 130 nm and less than 550 nm.

Description

[Technical Field]

[0001] This invention relates to a light-absorbing structure and a display device. [Previous Technology]

[0002] A transparent display device is a light-transmitting display device that allows users to simultaneously see the displayed image information and the background information behind the display device. Transparent display devices have many applications, such as vending machine windows, car windows, residential windows, and shop windows.

[0003] When a display device displays an image, the light emitted by the light source inside the display device may be reflected within the display device, causing light leakage from the back of the display device. Especially at wide viewing angles, the image displayed by the display device may be reflected at the interface between the display device and the air, and the reflected light may leak out from the back of the display device, affecting the visual effect of the back of the display device. [Summary of the Invention]

[0004] The present invention provides a light-absorbing structure for a display device, the light-absorbing structure including a light control layer and an optical compensation film superimposed on the light control layer, thereby reducing the back-side light leakage problem of the display device.

[0005] At least one embodiment of the present invention provides a light-absorbing structure for a display device, including a light control layer and a first optical compensation film superimposed on the light control layer. The angle between the absorption axis of the light control layer and the normal direction of the light control layer is less than or equal to 10 degrees. The absolute value of the in-plane phase delay R0 of the first optical compensation film is greater than 130 nm and less than 550 nm.

[0006] At least one embodiment of the present invention provides a display device, including a display panel and a light-absorbing structure. The display panel has a first surface and a second surface opposite to the first surface, the first surface being the display surface of the display panel. The light-absorbing structure is located on the first surface or the second surface of the display panel. The light-absorbing structure includes a light control layer and a first optical compensation film superimposed on the light control layer. The angle between the absorption axis of the light control layer and the normal direction of the light control layer is less than or equal to 10 degrees. The absolute value of the in-plane phase retardation R0 of the first optical compensation film is greater than 130 nm and less than 550 nm.

Implementation Method

[0008] FIG1 is a cross-sectional schematic diagram of a display device 1A according to an embodiment of the present invention. Referring to FIG1, the display device 1A includes a display panel 10, a light-absorbing structure 20A, and an anti-reflective film 500. The light-absorbing structure 20A is disposed inside or on the display panel 10. The anti-reflective film 500 is disposed on the outer side of the display panel 10 or the light-absorbing structure 20A.

[0009] The display panel 10 has a first surface 11 and a second surface 12 (also called the back surface) opposite to the first surface 11 (also called the display surface). The display panel 10 is any type of transparent display panel, such as a transparent liquid crystal display panel, a transparent micro-light-emitting diode display panel, a transparent organic light-emitting diode display panel, or other types of display panels. In this embodiment, the display panel 10 is a transparent micro-light-emitting diode display panel. In some embodiments, the light-absorbing structure 20A is located on the first surface 11 of the display panel 10, and the light-absorbing structure 20A is located between the anti-reflective film 500 and the display panel 10.

[0010] The display panel 10 includes a circuit board 100, a light-emitting diode 190, an encapsulation layer 200, and a cover plate 220. The side of the circuit board 100 facing away from the cover plate 220 is a second side 12, and the side of the cover plate 220 facing away from the circuit board 100 is a first side 11. The light-emitting diode 190 and the encapsulation layer 200 are located between the circuit board 100 and the cover plate 220. The circuit board 100 includes a substrate 110, an insulating layer 120, an insulating layer 130, an insulating layer 140, an insulating layer 150, a signal line 160, a pad 170, and a reflective layer 180.

[0011] The substrate 110 and the cover plate 220 are, for example, rigid substrates, and their materials may be glass, quartz, organic polymers, or other suitable materials. However, the invention is not limited thereto, and in other embodiments, the substrate 110 and the cover plate 220 may also be flexible substrates or stretchable substrates. For example, the materials of flexible substrates and stretchable substrates include polyimide (PI), polydimethylsiloxane (PDMS), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyester (PES), polymethylmethacrylate (PMMA), polycarbonate (PC), polyurethane (PU), or other suitable materials.

[0012] Insulating layers 120, 130, 140, and 150 are sequentially disposed on the substrate 110. In some embodiments, the material and quantity of the insulating layers on the substrate 110 can be adjusted as needed. A signal line 160 is disposed on the substrate 110. In some embodiments, the position of the signal line 160 can be adjusted as needed. For example, the signal line 160 can be disposed between insulating layers.

[0013] The insulating layer 150 has an opening for accommodating the light-emitting diode 190, and the reflective layer 180 is optionally disposed on the surface of the aforementioned opening, thereby improving the luminous efficiency of the display device 1A.

[0014] The light-emitting diode 190 is electrically connected to the pad 170 of the circuit board 100. For example, the electrode 192 of the light-emitting diode 190 is connected to the pad 170 via solder 194. In other embodiments, the light-emitting diode 190 is connected to the pad 170 via conductive adhesive. The light-emitting diode 190 can be any form of light-emitting diode, and the present invention does not limit the color and type of the light-emitting diode 190.

[0015] The encapsulation layer 200 covers the light-emitting diode 190. The cover plate 220 is bonded to the encapsulation layer 200 through a transparent adhesive layer 210. The material of the transparent adhesive layer 210 is, for example, water-based adhesive (Optical Clear Resin, OCR), optical clear adhesive (Optical Clear Adhesive, OCA), pressure-sensitive adhesive (Pressure Sensitive Adhesive, PSA), or other suitable adhesives.

[0016] The light-absorbing structure 20A is located outside or inside the display panel 100. In this embodiment, the light-absorbing structure 20A is located on the first surface 11 of the display panel 100, but the present invention is not limited thereto. In other embodiments, the light-absorbing structure 20A is located on the second surface 12 of the display panel 100 or between the substrate 110 and the cover plate 220.

[0017] The light-absorbing structure 20A includes a light control layer 300 and a first optical compensation film 410A superimposed on the light control layer 300. In this embodiment, the light control layer 300 is located between the first optical compensation film 410A and the first surface 11 of the cover plate 220.

[0018] The light control layer 300 may be a thin film or a liquid crystal cell, configured to absorb light with a specific polarization state. Generally, unpolarized light contains both P-waves and S-waves, and the light control layer 300 is configured to have a higher absorption rate for P-waves in the light emitted by the display panel 100 than for S-waves. Therefore, the light passes through the light control layer 300 and becomes predominantly S-wave polarized light. In some embodiments, the light control layer 300 has a transmittance of less than 25% for P-waves at a 30-degree tilt angle in visible light and a transmittance of more than 35% for S-waves at a 30-degree tilt angle in visible light.

[0019] In some embodiments, by adjusting the absorption axis of the light control layer 300, the light control layer 300 can absorb P-waves while allowing S-waves to pass through. Specifically, in this embodiment, the angle between the absorption axis of the light control layer 300 and the normal direction 502 (i.e., the Z-axis direction) of the light control layer is less than or equal to 10 degrees, preferably 0 degrees. In some embodiments, in addition to having an absorption axis that is substantially parallel to the normal direction 502, the light control layer 300 may also have another absorption axis (e.g., an absorption axis parallel to the X-axis direction) on a plane of the light control layer 300 perpendicular to the normal direction 502. Therefore, the light control layer 300 can absorb the polarization states in the Z-axis direction and the X-axis direction of the light.

[0020] The first optical compensation film 410A can also be referred to as a phase retardation film. The refractive indices of the first optical compensation film 410A in the xyz directions are nx1, ny1, and nz1, respectively, wherein the direction of nz1 is parallel to the normal direction of the first optical compensation film 410A. The in-plane phase retardation R0 of the first optical compensation film 410A is equal to (nx1-ny1)d1, where d1 is the thickness of the first optical compensation film 410A. In some embodiments, d1 is 100 nm to 200 μm. In this embodiment, the absolute value of the in-plane phase retardation R0 of the first optical compensation film 410A is greater than 130 nm and less than 550 nm. In this embodiment, the light-absorbing structure 20A includes a single-layer phase retardation film (i.e., the first optical compensation film 410A), but the present invention is not limited thereto. In other embodiments, the light-absorbing structure 20A includes multiple phase retardation films.

[0021] In some embodiments, the absolute value of the in-plane phase delay R0 of the first optical compensation film 410A is greater than or equal to the absolute value of the in-plane phase delay R0 of the quarter-wave plate (approximately 137.5 nm). In some embodiments, the first optical compensation film 410A may be a half-wave plate (or x+1 / 2), where x is an integer. In this case, the absolute value of the in-plane phase delay R0 of the first optical compensation film 410A is approximately 275 nm.

[0022] The anti-reflective film 500 is optionally disposed on the first optical compensation film 410A. In this embodiment, the anti-reflective film 500 is located on the light-absorbing structure 20A, and the light-absorbing structure 20A is located between the anti-reflective film 500 and the display panel 10. The anti-reflective film 500 may have a single-layer structure or a multi-layer structure. In some embodiments, the anti-reflective film 500 may be a moth-eye anti-reflective coating.

[0023] Figure 1 shows several paths of light emitted from the light-emitting diode 190. Light 610 is emitted perpendicular to the first surface 11, while light 710 is emitted at a large angle. Both light 610 and light 710 are unpolarized light. The light control layer 300 absorbs most of the P-waves in light 710. In some embodiments, light 720 passing through the light control layer 300 is linearly polarized S-wave light or S-wave light mixed with a small amount of P-wave polarization. In some embodiments, if the absorption axis of the light control layer 300 is not completely parallel to the normal direction 502, some of the light 620 may also be absorbed.

[0024] The polarization patterns of light rays 620 and 720 are changed after passing through the first optical compensation film 410A, transforming them into light rays 630 and 730. In some embodiments, since light rays 620 and 720 enter the first optical compensation film 410A at different angles and are transformed into light rays 630 and 730, light rays 630 and 730 may have different degrees of phase delay. In some embodiments, at the interface between the first optical compensation film 410A and the anti-reflective film 500 (or air in the absence of the anti-reflective film 500), light ray 730 is, for example, circularly polarized light or elliptically polarized light.

[0025] Since the light ray 630 leaves the first optical compensation film 410A in a nearly vertical direction, the light ray 630 will not show significant reflection at the interface between the first optical compensation film 410A and the anti-reflection film 500 (or air). In contrast, since the light ray 730 arrives at the interface between the anti-reflection film 500 and air (or the interface between the first optical compensation film 410A and air in the absence of the anti-reflection film 500) at a larger angle, the light ray 730 will be split at the interface between the first optical compensation film 410A and air or the interface between the anti-reflection film 500 and air into a light ray 740 that leaves the first optical compensation film 410A and enters the air, and into a reflected light ray 750.

[0026] The reflected light 750 has a circular polarization direction opposite to that of the light 730, and after passing through the first optical compensation film 410A again, the first optical compensation film 410A will convert the light 750 into linearly polarized light of P-wave or polarized light of P-wave mixed with a small amount of S-wave.

[0027] Since the light control layer 300 has a relatively large absorption rate for P-waves, most of the light 750 will be absorbed by the light control layer 300, thereby reducing the back light leakage problem of the display device 1A.

[0028] FIG2 is a schematic cross-sectional view of a display device 1B according to an embodiment of the present invention. It should be noted that the embodiment of FIG2 uses the component reference numerals and some contents of the embodiment of FIG1, wherein the same or similar reference numerals are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, please refer to the foregoing embodiments, which will not be repeated here.

[0029] The difference between the display device 1B in Figure 2 and the display device 1A in Figure 1 is that the light-absorbing structure 20B of the display device 1B includes a light control layer 300 and a first optical compensation film 410B and a second optical compensation film 420B superimposed on the light control layer 300.

[0030] The second optical compensation film 420B is located on the first optical compensation film 410B, and the first optical compensation film 410B is located between the light control layer 300 and the second optical compensation film 420B.

[0031] In this embodiment, both the first optical compensation film 410B and the second optical compensation film 420B can be referred to as phase retardation films. The refractive indices of the first optical compensation film 410B in the xyz directions are nx1, ny1, and nz1, respectively, wherein the direction of nz1 is parallel to the normal direction of the first optical compensation film 410B. The refractive indices of the second optical compensation film 420B in the xyz directions are nx2, ny2, and nz2, respectively, wherein the direction of nz2 is parallel to the normal direction of the second optical compensation film 420B. The in-plane phase retardation R0 of the first optical compensation film 410B is equal to (nx1-ny1)d1, where d1 is the thickness of the first optical compensation film 410B. The in-plane phase retardation R0 of the second optical compensation film 420B is equal to (nx2-ny2)d2, where d2 is the thickness of the second optical compensation film 420B. In some embodiments, d1 and d2 are each 100 nm to 200 μm. In this embodiment, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410B and the in-plane phase delay R0 of the second optical compensation film 420B are greater than 130 nm and less than 550 nm. For example, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410B and the in-plane phase delay R0 of the second optical compensation film 420B are both in the range of 195 nm to 350 nm, for example, about 270 nm. In some embodiments, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410B and the second optical compensation film 420B are greater than or equal to the absolute value of the in-plane phase delay R0 of a 1 / 4 wavelength waveplate (about 137.5 nm). In some embodiments, both the first optical compensation film 410B and the second optical compensation film 420B can be referred to as 1 / 2 (or x+1 / 2) wavelength waveplates. The angle between the slow axis of the first optical compensation film 410B and the slow axis of the second optical compensation film 420B is in the range of 30° to 60°, for example, about 45°.

[0032] Figure 2 shows several paths of light emitted from the light-emitting diode 190. Light 610 is emitted perpendicular to the first surface 11, while light 710 is emitted at a large angle. Both light 610 and light 710 are unpolarized light. The light control layer 300 absorbs most of the P-waves in light 710. In some embodiments, light 720 passing through the light control layer 300 is linearly polarized S-wave light or S-wave light mixed with a small amount of P-wave polarization. In some embodiments, if the absorption axis of the light control layer 300 is not perfectly parallel to the normal direction, some of the light 620 may also be absorbed.

[0033] The polarization patterns of light rays 620 and 720 are altered after passing through the first optical compensation film 410B and the second optical compensation film 420B, transforming them into light rays 630 and 730. In some embodiments, since light rays 620 and 720 enter the first optical compensation film 410B and the second optical compensation film 420B at different angles and are then transformed into light rays 630 and 730, light rays 630 and 730 may have different degrees of phase delay. In some embodiments, at the interface between the second optical compensation film 420B and air, light ray 730 is, for example, linearly polarized P-wave light or P-wave light mixed with a small amount of S-wave polarized light.

[0034] Since the light ray 630 leaves the second optical compensation film 420B in a nearly vertical direction, there is no significant reflection at the interface between the second optical compensation film 420B and the air. In contrast, since the light ray 730 arrives at the interface between the second optical compensation film 420B and the air at a larger angle, the light ray 730 is split at the interface between the second optical compensation film 420B and the air into light ray 740 leaving the second optical compensation film 420B and reflected light ray 750. In this embodiment, P-waves have high transmittance at the interface between the second optical compensation film 420B and the air. Since the light ray 730 is approximately a P-wave at the interface between the second optical compensation film 420B and the air, most of the light ray 730 can leave the first optical compensation film 410A and form light ray 740.

[0035] Since most of the P-waves leave the first optical compensation film 410A, the reflected light 750 contains light with S-waves mixed with a small amount of P-waves. After passing through the first optical compensation film 410B and the second optical compensation film 420B again, the first optical compensation film 410B and the second optical compensation film 420B will convert the light 750 into polarized light with P-waves mixed with a small amount of S-waves.

[0036] Since the light control layer 300 has a relatively large absorption rate for P-waves, most of the light 750 will be absorbed by the light control layer 300, thereby reducing the back light leakage problem of the display device 1B.

[0037] Referring to Figure 2, the light emitted by the light-emitting diode 190 sequentially passes through the light control layer 300 and the compensation structure composed of the first optical compensation film 410B and the second optical compensation film 420B. Tables 1, 2, and 3 show the light distribution in each film layer of the display device 1B according to an embodiment of the present invention. In Tables 1, 2, and 3, it is assumed that the film layers other than the light control layer 300 and the compensation structure (i.e., the first optical compensation film 410B and the second optical compensation film 420B) do not absorb light, and that the in-plane phase retardation R0 of the first optical compensation film 410B and the second optical compensation film 420B is 270 nm, and the angle between the slow axis of the first optical compensation film 410B and the slow axis of the second optical compensation film 420B is 45 degrees. In the embodiments shown in Tables 1, 2, and 3, the transmittance of the display device 1B at a positive viewing angle is 76%. Table 1 shows the percentage of light remaining after the light emitted by the light-emitting diode passes through each film layer at a 30-degree exit angle. Table 1 P waves in light S-waves in light Light emitted by a light-emitting diode 100.000% 100.000% The light rays at the interface between the light control layer and the compensation structure after passing through the light control layer. 12.512% 89.095% The light rays at the interface between the compensation structure and the air after passing through the compensation structure. 89.095% 12.512% Light rays entering the air from the front 88.204% 10.010% The proportion of light entering the air from the front is [missing information]. 49.110%

[0038] Table 2 shows the percentage of light emitted by the light-emitting diode that remains after being reflected at a 30-degree angle at the interface between the compensation structure and air, and then re-passing through each film layer at a 30-degree angle of incidence. Continuing from the results in Table 1, approximately 0.891% of the P-wave and 2.502% of the S-wave are reflected at the interface between the compensation structure and air. Table 2 P waves in light S-waves in light Light reflected at the interface between the compensating structure and the air 0.891% 2.502% The light rays at the interface between the light control layer and the compensation structure after passing through the compensation structure. 2.502% 0.891% Light rays that leave the light control layer after passing through the light control layer 0.313% 0.793% Light in the substrate (glass) 0.313% 0.794% Light rays that pass through the substrate (glass) and enter the air from the back side (second side). 0.310% 0.64% The proportion of light entering the air from the rear is [not specified]. 0.472%

[0039] As can be seen from Tables 1 and 2, the back-side light leakage can be greatly reduced by using the light control layer 300 and the compensation structure (i.e., the first optical compensation film 410B and the second optical compensation film 420B), thereby improving the visual effect of the display device.

[0040] Referring to Figure 2, external light entering the display device 1B from the back side can exit from the front side of the display device 1B after passing through each film layer. Table 3 shows the percentage of external light remaining after passing through each film layer at a 30-degree exit angle. In Table 3, it is assumed that the light does not pass through any opaque components. Table 3 P waves in light S-waves in light external light 100.000% 100.000% External light enters the display device from the back side after passing through the interface between the substrate and air. 99.000% 80.000% External light passing through the substrate 99.000% 80.000% External light entering the light control layer after passing through the transparent adhesive layer 99.000% 80.000% External light rays at the interface between the light control layer and the compensation structure after passing through the light control layer 12.387% 71.276% After passing through the compensation structure, the external light at the interface between the compensation structure and the air... 71.276 12.387 External light entering the air from the front 70.563% 9.910% The proportion of external light entering the air from the front is the original ratio. 40.240%

[0041] As can be seen from Table 3, the display device 1B has a transmittance of about 40% at a viewing angle (tilt angle (theta)) of 30 degrees.

[0042] FIG3 is a schematic cross-sectional view of a display device 1C according to an embodiment of the present invention. It should be noted that the embodiment of FIG3 uses the component reference numerals and some contents of the embodiment of FIG2, wherein the same or similar reference numerals are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, please refer to the foregoing embodiments, which will not be repeated here.

[0043] The difference between the display device 1C in FIG3 and the display device 1B in FIG2 is that the light-absorbing structure 20C of the display device 1C includes a light control layer 300 and a first optical compensation film 410C and a second optical compensation film 420C superimposed on the light control layer 300. The light-absorbing structure 20C is located on the second surface 12, and the first optical compensation film 410C and the second optical compensation film 420C are located between the light control layer 300 and the circuit board 100. The first optical compensation film 410C is located between the light control layer 300 and the second optical compensation film 420C. In some embodiments, the display device 1C further includes an anti-reflective film (not shown) disposed on the first surface 11 of the display panel 10, wherein the display panel 10 is located between the anti-reflective film and the light-absorbing structure 20C.

[0044] In this embodiment, both the first optical compensation film 410C and the second optical compensation film 420C can be referred to as phase retardation films. The refractive indices of the first optical compensation film 410C in the xyz directions are nx1, ny1, and nz1, respectively, wherein the direction of nz1 is parallel to the normal direction of the first optical compensation film 410C. The refractive indices of the second optical compensation film 420C in the xyz directions are nx2, ny2, and nz2, respectively, wherein the direction of nz2 is parallel to the normal direction of the second optical compensation film 420C. The in-plane phase retardation R0 of the first optical compensation film 410C is equal to (nx1-ny1)d1, where d1 is the thickness of the first optical compensation film 410C. The in-plane phase retardation R0 of the second optical compensation film 420C is equal to (nx2-ny2)d2, where d2 is the thickness of the second optical compensation film 420C. In this embodiment, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410C and the in-plane phase delay R0 of the second optical compensation film 420C are greater than 130 nm and less than 550 nm. For example, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410C and the in-plane phase delay R0 of the second optical compensation film 420C are both in the range of 195 nm to 350 nm, for example, about 270 nm. In some embodiments, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410C and the second optical compensation film 420C are greater than or equal to the absolute value of the in-plane phase delay R0 of a 1 / 4 wavelength waveplate (about 137.5 nm). In some embodiments, both the first optical compensation film 410C and the second optical compensation film 420C can be referred to as 1 / 2 (or x+1 / 2) wavelength waveplates, where x is an integer. The angle between the slow axis of the first optical compensation film 410C and the slow axis of the second optical compensation film 420C is in the range of 30° to 60°, for example, about 45°.

[0045] Figure 3 shows several paths of light emitted from the light-emitting diode 190. Light 610 is emitted perpendicular to the first surface 11, while light 710 is emitted at a large angle. Light 610 and light 710 are unpolarized light.

[0046] Since the light ray 610 leaves the cover plate 220 in a nearly vertical direction, the light ray 610 will not be significantly reflected at the interface between the cover plate 220 and the air. In contrast, since the light ray 710 arrives at the interface between the cover plate 220 and the air at a larger angle, the light ray 710 will be split at the interface between the cover plate 220 and the air into light ray 740 leaving the cover plate 220 and reflected light ray 750. In this embodiment, the P-wave has a higher transmittance at the interface between the cover plate 220 and the air. Therefore, the reflected light ray 750 is linearly polarized S-wave light or S-wave mixed with a smaller amount of P-wave polarized light than S-wave, while the light ray 740 is linearly polarized P-wave light or P-wave mixed with a smaller amount of S-wave polarized light than P-wave.

[0047] The reflected light 750 passes through the cover plate 220 again and reaches the interface between the substrate 110 and the second optical compensation film 420C. Then, the polarization mode of the light 750 is changed after passing through the second optical compensation film 420C and the first optical compensation film 410C, transforming it into light 760. In some embodiments, at the interface between the first optical compensation film 410C and the light control layer 300, the light 760 is, for example, linearly polarized P-wave light or P-wave light mixed with a small amount of S-wave polarization.

[0048] The light control layer 300 absorbs most of the P-waves in the light 760, so that most of the light 760 is absorbed by the light control layer 300, thereby reducing the back light leakage problem of the display device 1C.

[0049] Referring to Figure 3, the light emitted by the light-emitting diode 190 can enter the air after passing through the cover plate 220. Tables 4, 5, and 6 show the light distribution in each film layer of the display device 1C according to one embodiment of the present invention. In Tables 4, 5, and 6, it is assumed that the film layers other than the light control layer 300 and the compensation structure (i.e., the first optical compensation film 410C and the second optical compensation film 420C) do not absorb light, and that the in-plane phase retardation R0 of the first optical compensation film 410C and the second optical compensation film 420C is 270 nm, and the angle between the slow axis of the first optical compensation film 410C and the slow axis of the second optical compensation film 420C is 45 degrees. In the embodiment shown in Tables 4, 5, and 6, the transmittance of the display device 1C at a positive viewing angle is 76%. Table 4 shows the percentage of light remaining after the light emitted by the light-emitting diode passes through each film layer at a 30-degree exit angle. Table 4 P waves in light S-waves in light Light emitted by a light-emitting diode 100.000% 100.000% The light at the interface between the cover plate and the air after passing through the cover plate. 100.000% 100.000% Light rays entering the air from the front 99.000% 80.000% The proportion of light entering the air from the front is [missing information]. 89.500%

[0050] As can be seen from Table 4, the light-absorbing structure 20C of the display device 1C is disposed on the second surface 12 of the display panel 100, which can increase the amount of light entering the air from the front.

[0051] Table 5 shows the percentage of light emitted by the light-emitting diode that remains after being reflected at a 30-degree angle at the interface between the cover plate and air, and then re-passing through each film layer at an incident angle of 30 degrees. Continuing from the results in Table 4, approximately 1% of the P-wave and 20% of the S-wave are reflected at the interface between the cover plate and air. Table 5 P waves in light S-waves in light Light reflected at the interface between the cover plate (glass) and the air. 1.000% 20.000% The light rays at the interface between the substrate (glass) and the compensation structure 1.000% 20.000% After passing through the compensation structure, the light at the interface between the compensation structure and the light control layer... 20.000% 1.000% The light rays at the interface between the light control layer and the air after passing through the light control layer. 2.502% 0.890% Light rays entering the air from the back side after passing through the light control layer 2.477% 0.712% The proportion of light entering the air from the rear is [not specified]. 1.595%

[0052] As can be seen from Tables 4 and 5, the back-side light leakage can be greatly reduced by using the light control layer 300 and the compensation structure (i.e., the first optical compensation film 410C and the second optical compensation film 420C), thereby improving the visual effect of the display device 1C.

[0053] Referring to Figure 3, external light entering the display device 1C from the back side can exit from the front side of the display device 1C after passing through each film layer. Table 6 shows the percentage of external light remaining after passing through each film layer at a 30-degree exit angle in one embodiment. In Table 6, it is assumed that the light does not pass through any opaque elements. Table 6 P waves in light S-waves in light external light 100.000% 100.000% External light enters the display device from the back after passing through the interface between the light control layer and the air. 99.000% 80.000% External light rays at the interface between the light control layer and the compensation structure after passing through the light control layer 12.387% 71.276% After passing through the compensation structure, the external light at the interface between the compensation structure and the substrate... 71.276% 12.387% External light at the interface between the cover plate and the air after passing through the cover plate. 71.276% 12.387% External light entering the air from the front 70.563% 9.909% The proportion of external light entering the air from the front is the original ratio. 40.23%

[0054] As can be seen from Table 6, the display device 1C has a transmittance of about 40% at a viewing angle of 30 degrees.

[0055] Tables 7, 8, and 9 show the light distribution in each film layer of the display device 1C according to another embodiment of the present invention. The embodiments in Tables 7, 8, and 9 differ from those in Tables 4, 5, and 6 in that the concentration of the absorbing material in the light control layer is increased in the embodiments in Tables 7, 8, and 9, resulting in a transmittance of 63% for the display device 1C at a normal viewing angle. Table 7 shows the percentage of light remaining after the light emitted by the light-emitting diode passes through each film layer at a 30-degree exit angle. Table 7 P waves in light S-waves in light Light emitted by a light-emitting diode 100.000% 100.000% The light at the interface between the cover plate and the air after passing through the cover plate. 100.000% 100.000% Light rays entering the air from the front 99.000% 80.000% The proportion of light entering the air from the front is [missing information]. 89.500%

[0056] As can be seen from Table 7, the light-absorbing structure 20C of the display device 1C is disposed on the second surface 12 of the display panel 100, which can increase the amount of light entering the air from the front.

[0057] Table 8 shows the percentage of light emitted by the light-emitting diode that remains after being reflected at a 30-degree angle at the interface between the cover plate and air, and then re-passing through each film layer at an incident angle of 30 degrees. Continuing from the results in Table 7, approximately 1% of the P-wave and 20% of the S-wave are reflected at the interface between the cover plate and air. Table 8 P waves in light S-waves in light Light reflected at the interface between the cover plate (glass) and the air. 1.000% 20.000% The light rays at the interface between the substrate (glass) and the compensation structure 1.000% 20.000% After passing through the compensation structure, the light at the interface between the compensation structure and the light control layer... 20.000% 1.000% The light rays at the interface between the light control layer and the air after passing through the light control layer. 0.31% 0.8% Light rays entering the air from the back side after passing through the light control layer 0.307% 0.64% The proportion of light entering the air from the rear is [not specified]. 0.473%

[0058] As can be seen from Tables 7 and 8, the back-side light leakage can be greatly reduced by using the light control layer 300 and the compensation structure (i.e., the first optical compensation film 410C and the second optical compensation film 420C), thereby improving the visual effect of the display device 1C.

[0059] Referring to Figure 3, external light entering the display device 1C from the back side can exit from the front side of the display device 1C after passing through each film layer. Table 9 shows the percentage of external light remaining after passing through each film layer at a 30-degree exit angle in one embodiment. In Table 9, it is assumed that the light does not pass through any opaque elements. Table 9 P waves in light S-waves in light external light 100.000% 100.000% External light enters the display device from the back after passing through the interface between the light control layer and the air. 99.000% 80.000% External light rays at the interface between the light control layer and the compensation structure after passing through the light control layer 1.534% 64.000% After passing through the compensation structure, the external light at the interface between the compensation structure and the substrate... 64.000% 1.534% External light at the interface between the cover plate and the air after passing through the cover plate. 64% 1.534% External light entering the air from the front 63.36% 1.228% The proportion of external light entering the air from the front is the original ratio. 32.293%

[0060] As can be seen from Table 9, the display device 1C has a transmittance of about 32% at a viewing angle of 30 degrees.

[0061] FIG4 is a schematic cross-sectional view of a display device 1D according to an embodiment of the present invention. It should be noted that the embodiment of FIG4 uses the component reference numerals and some contents of the embodiment of FIG3, wherein the same or similar reference numerals are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, please refer to the foregoing embodiments, which will not be repeated here.

[0062] The difference between the display device 1D in FIG. 4 and the display device 1C in FIG. 3 is that the light-absorbing structure 20D of the display device 1D includes a light control layer 300 and a first optical compensation film 410D, a second optical compensation film 420D, a third optical compensation film 430D, and a fourth optical compensation film 440D superimposed on the light control layer 300. The light-absorbing structure 20D is located on the second surface 12, and the first optical compensation film 410D and the second optical compensation film 420D are located between the light control layer 300 and the circuit board 100. The first optical compensation film 410D is located between the light control layer 300 and the second optical compensation film 420D. The third optical compensation film 430D is located on the light control layer 300, and the light control layer 300 is located between the first optical compensation film 410D and the third optical compensation film 430D. The fourth optical compensation film 440D is located on the third optical compensation film 430D, and the third optical compensation film 430D is located between the light control layer 300 and the fourth optical compensation film 440D.

[0063] In this embodiment, the first optical compensation film 410D, the second optical compensation film 420D, the third optical compensation film 430D, and the fourth optical compensation film 440D can all be referred to as phase retardation films. The refractive indices of the first optical compensation film 410D in the xyz directions are nx1, ny1, and nz1, respectively, wherein the direction of nz1 is parallel to the normal direction of the first optical compensation film 410D. The refractive indices of the second optical compensation film 420D in the xyz directions are nx2, ny2, and nz2, respectively, wherein the direction of nz2 is parallel to the normal direction of the second optical compensation film 420D. The refractive indices of the third optical compensation film 430D in the xyz directions are nx3, ny3, and nz3, respectively, wherein the direction of nz3 is parallel to the normal direction of the third optical compensation film 430D. The refractive indices of the fourth optical compensation film 440D in the xyz directions are nx4, ny4, and nz4, respectively, wherein the direction of nz4 is parallel to the normal direction of the fourth optical compensation film 440D. The in-plane phase delay R0 of the first optical compensation film 410D is equal to (nx1-ny1)d1, where d1 is the thickness of the first optical compensation film 410D. The in-plane phase delay R0 of the second optical compensation film 420D is equal to (nx2-ny2)d2, where d2 is the thickness of the second optical compensation film 420D. The in-plane phase delay R0 of the third optical compensation film 430D is equal to (nx3-ny3)d3, where d3 is the thickness of the third optical compensation film 430D. The in-plane phase delay R0 of the fourth optical compensation film 440D is equal to (nx4-ny4)d4, where d4 is the thickness of the second optical compensation film 420D. In some embodiments, d1, d2, d3, and d4 are each from 100 nm to 200 μm. In this embodiment, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410D, the second optical compensation film 420D, the third optical compensation film 430D, and the fourth optical compensation film 440D are all greater than 130 nm and less than 550 nm. For example, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410D, the second optical compensation film 420D, the third optical compensation film 430D, and the fourth optical compensation film 440D are all in the range of 195 nm to 350 nm, for example, about 270 nm. In some embodiments, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410D, the second optical compensation film 420D, the third optical compensation film 430D, and the fourth optical compensation film 440D are greater than or equal to the absolute value of the in-plane phase delay R0 of the quarter-wave plate (approximately 137.5 nm).In some embodiments, the first optical compensation film 410D, the second optical compensation film 420D, the third optical compensation film 430D, and the fourth optical compensation film 440D can all be referred to as 1 / 2 (or x+1 / 2) wavelength waveplates. The angle between the slow axis of the first optical compensation film 410D and the slow axis of the second optical compensation film 420D is in the range of 30° to 60°, for example, about 45 degrees. The angle between the slow axis of the third optical compensation film 430D and the slow axis of the fourth optical compensation film 440D is in the range of 30° to 60°, for example, about 45 degrees.

[0064] Referring to Figure 4, the light emitted by the light-emitting diode 190 can enter the air after passing through the cover plate 220. Tables 10, 11 and 12 show the light distribution in each film layer of the display device 1D in one embodiment of the present invention. In Tables 10, 11, and 12, it is assumed that the films other than the light control layer 300, the first compensation structure (i.e., the first optical compensation film 410D and the second optical compensation film 420D), and the second compensation structure (i.e., the third optical compensation film 430D and the fourth optical compensation film 440D) do not absorb light, and that the in-plane phase retardation R0 of the first optical compensation film 410D, the second optical compensation film 420D, the third optical compensation film 430D, and the fourth optical compensation film 440D is 270 nm, and the angle between the slow axis of the first optical compensation film 410D and the slow axis of the second optical compensation film 420D is 45 degrees, and the angle between the slow axis of the third optical compensation film 430D and the slow axis of the fourth optical compensation film 440D is 45 degrees. In the embodiments in Tables 10, 11, and 12, the transmittance of the display device 1D at the forward viewing angle is 76%. Table 10 shows the percentage of light remaining after the light emitted by the light-emitting diode passes through each film layer at a 30-degree exit angle. P waves in light S-waves in light Light emitted by a light-emitting diode 100.000% 100.000% The light at the interface between the cover plate and the air after passing through the cover plate. 100.000% 100.000% Light rays entering the air from the front 99.000% 80.000% The proportion of light entering the air from the front is [missing information]. 89.500%

[0065] As can be seen from Table 10, the light-absorbing structure 20D of the display device 1D is disposed on the second surface 12 of the display panel 100, which can increase the amount of light entering the air from the front.

[0066] Table 11 shows the percentage of light emitted by the light-emitting diode that remains after being reflected at a 30-degree angle at the interface between the compensation structure and air, and then re-passing through each film layer at an incident angle of 30 degrees. Continuing from the results in Table 10, approximately 1% of the P-wave and 20% of the S-wave are reflected at the interface between the compensation structure and air. Table 11 P waves in light S-waves in light Light reflected at the interface between the cover plate (glass) and the air. 1.000% 20.000% The light rays at the interface between the substrate (glass) and the first compensation structure 1.000% 20.000% After passing through the first compensation structure, the light at the interface between the first compensation structure and the light control layer... 20.000% 1.000% The light rays at the interface between the light control layer and the second compensation structure after passing through the light control layer 2.502% 0.891% The light rays passing through the second compensation structure at the interface between the second compensation structure and the air... 0.891% 2.502% Light rays entering the air from the back side after passing through the second compensation structure 0.882% 2.012% The proportion of light entering the air from the rear is [not specified]. 1.442%

[0067] As can be seen from Tables 10 and 11, the back-side light leakage can be slightly reduced by using the light control layer 300, the first compensation structure (i.e., the first optical compensation film 410D and the second optical compensation film 420D) and the second compensation structure (i.e., the third optical compensation film 430D and the fourth optical compensation film 440D), thereby improving the visual effect of the display device 1D.

[0068] Referring to Figure 4, external light entering the display device 1D from the back side can exit from the front side of the display device 1D after passing through each film layer. Table 12 shows the percentage of external light remaining after passing through each film layer at a 30-degree exit angle in one embodiment. In Table 12, it is assumed that the light does not pass through any opaque elements. Table 12 P waves in light S-waves in light external light 100.000% 100.000% After passing through the interface between the second compensation structure and air, external light enters the display device from the back side. 99.000% 80.000% After passing through the second compensation structure, the external light at the interface between the second compensation structure and the light control layer is... 80.000% 99.000% External light rays at the interface between the light control layer and the first compensation structure after passing through the light control layer 10.010% 88.204% After passing through the first compensation structure, external light at the interface between the first compensation structure and the substrate... 88.204% 10.010% External light at the interface between the cover plate and the air after passing through the cover plate. 88.204% 10.010% External light entering the air from the front 87.322% 8.008% The proportion of external light entering the air from the front is the original ratio. 47.665%

[0069] As can be seen from Table 12, the transmittance of the display device 1D increases significantly to about 47% at a viewing angle of 30 degrees.

[0070] FIG5 is a schematic cross-sectional view of a display device 1E according to an embodiment of the present invention. It should be noted that the embodiment of FIG5 uses the component reference numerals and some contents of the embodiment of FIG1, wherein the same or similar reference numerals are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, please refer to the foregoing embodiments, which will not be repeated here.

[0071] The difference between the display device 1E in Figure 5 and the display device 1A in Figure 1 is that the light-absorbing structure 20E of the display device 1E includes a light control layer 300 and a first optical compensation film 410E, a second optical compensation film 420E, and a third optical compensation film 430E superimposed on the light control layer 300. The light-absorbing structure 20E is located on the first surface 11. The second optical compensation film 420E is located on the first optical compensation film 410E, and the first optical compensation film 410E is located between the light control layer 300 and the second optical compensation film 420E. The third optical compensation film 430E is located on the second optical compensation film 420E, and the second optical compensation film 420E is located between the first optical compensation film 410E and the third optical compensation film 430E.

[0072] In this embodiment, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410E, the second optical compensation film 420E, and the third optical compensation film 430E are greater than 130 nm and less than 550 nm. For example, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410E, the second optical compensation film 420E, and the third optical compensation film 430E are all in the range of 130 nm to 195 nm. In some embodiments, the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film 410E, the second optical compensation film 420E, and the third optical compensation film 430E are greater than or equal to the absolute value of the in-plane phase delay R0 of a quarter-wave plate (approximately 137.5 nm). The angle between the slow axis of the first optical compensation film 410E and the slow axis of the second optical compensation film 420E is in the range of 60° to 120°. The angle between the slow axis of the second optical compensation film 420E and the slow axis of the third optical compensation film 430E is in the range of 60° to 120°.

[0073] FIG6A is a schematic cross-sectional view of a light control layer 300 of a display device according to an embodiment of the present invention. FIG6B is a schematic cross-sectional view of liquid crystal molecules in a light control layer according to an embodiment of the present invention. In some embodiments, the light control layer 300 is an electrically controlled birefringence (ECB) liquid crystal cell, a multi-domain vertically aligned (MVAB) liquid crystal cell, or an LCP (Liquid Crystal Polymer) or other types of liquid crystal cells.

[0074] Referring to Figures 6A and 6B, the light control layer 300 includes a plurality of liquid crystal molecules 310 and a dye 320. In some embodiments, the liquid crystal molecules 310 in the light control layer 300 can be voltage-controlled to enable the light control layer 300 to convert the polarization state of light with a wide viewing angle into linear polarization.

[0075] The liquid crystal molecule 310 has a long axis LD and a short axis SD. The angle α between the direction of the long axis of the liquid crystal molecule 310 and the normal direction ND of the light control layer 300 is substantially less than or equal to 10 degrees. This ensures that the angle between the absorption axis of the light control layer 300 and the normal direction ND is less than or equal to 10 degrees, thereby absorbing polarized light with the polarization axis of Z. Absorption of polarized light with the polarization axis of Z provides optimal optical performance while sacrificing minimal transmittance.

[0076] FIG7 is a simulation diagram of the back-side leakage brightness of a display device according to an embodiment of the present invention, and the phase delay Rth in the thickness direction and the in-plane phase delay R0 of the first optical compensation film. The cross-sectional view of the display device in FIG7 can be referred to the display device 1A in FIG1, and FIG7 shows the minimum brightness of the back-side leakage when the tilt angle (theta) is 75° and the azimuth angle (phi) is 0° to 360°.

[0077] Please refer to Figures 1 and 7. Adjusting the thickness-direction phase delay Rth and the in-plane phase delay R0 of the first optical compensation film 410A will affect the back-side light leakage brightness of the display device 1A. The thickness-direction phase delay Rth of the first optical compensation film 410A is equal to (nx1-nz1)d1, while the in-plane phase delay R0 is equal to (nx1-ny1)d1, where d1 is the thickness of the first optical compensation film 410B.

[0078] As shown in Figure 7, within a certain range of Rth and R0, the back-side light leakage of the display device 1A can be less than 20 nits.

[0079] When the R0 of the first optical compensation film 410A is positive, the first optical compensation film 410A meets the following conditions to make the back-side light leakage of the display device 1A smaller: the phase delay Rth in the thickness direction is less than 150nm, and 130 nm < R0 < (340 + (150 - Rth) × cot 50°) nm; or the phase delay Rth in the thickness direction is greater than 150nm, and 130 nm < R0 < (340 + (Rth - 150) × cot 60°) nm.

[0080] When the R0 of the first optical compensation film 410A is negative, the first optical compensation film 410A meets the following conditions to make the back-side light leakage of the display device 1A smaller: the phase delay Rth in the thickness direction is less than 150nm, and -130 nm > R0 > -[(340+(150-Rth)×cot 50°)] nm; or the phase delay Rth in the thickness direction is greater than 150nm, and -130 nm > R0 > -[(340+(Rth-150)×cot 60°)] nm.

[0081] Figure 8A is a diagram showing the relative brightness distribution of a display device at various viewing angles according to an embodiment of the present invention. Figure 8B is a graph showing the tilt angle (theta) and back-side light leakage of a display device according to an embodiment of the present invention when the azimuth angle (phi) is 0°. Figures 8A and 8B correspond to the display device 1A of Figure 1, wherein the R0 of the first optical compensation film 410A is -250 nm. The Nz of the first optical compensation film 410A is 0.6, where Nz is equal to R0 / Rth. The Rth' of the first optical compensation film 410A is -275 nm, where Rth' is equal to ((nx1+ny1) / 2-nz1)d1. In the embodiments of Figures 8A and 8B, the brightness of the display device at the forward viewing angle is 1000 nits. In this embodiment, within the range of tilt angle 0°~81° and azimuth angle 0°~360°, the maximum back-side light leakage is 111.2 nits, and the minimum back-side light leakage is 0. In this embodiment, the light leakage value at the frontal viewing angle is 0.2 nits.

[0082] Figure 9A shows the relative brightness distribution of a display device according to an embodiment of the present invention at various viewing angles. Figure 9B is a graph showing the tilt angle (theta) and back-side light leakage of a display device according to an embodiment of the present invention when the azimuth angle (phi) is 0°. Figures 9A and 9B also correspond to the display device 1A of Figure 1, the difference being that the properties of the first optical compensation film 410A are adjusted. In the embodiments of Figures 9A and 9B, the first optical compensation film 410A has R0 of -310 nm, Rth of -60 nm, and Rth' of 9.5 nm. In the embodiments of Figures 9A and 9B, the brightness of the display device at the forward viewing angle is 1000 nits.

[0083] Figure 10A shows the relative brightness distribution of a display device at various viewing angles according to an embodiment of the present invention. Figure 10B is a graph of the tilt angle (theta) and back-side light leakage of a display device according to an embodiment of the present invention when the azimuth angle (phi) is 0°. Figures 10A and 10B correspond to the display device 1B of Figure 2, wherein the R0 of the first optical compensation film 410B is 270 nm, and the R0 of the second optical compensation film 420B is 270 nm. The angle between the slow axis of the first optical compensation film 410B and the slow axis of the second optical compensation film 420B is 45 degrees. In the embodiments of Figures 10A and 10B, the brightness of the display device at the forward viewing angle is 1000 nits.

[0084] In summary, the light-absorbing structure includes a light control layer and an optical compensation film. The angle between the absorption axis of the light control layer and the normal direction is less than or equal to 10 degrees, and the absolute value of the in-plane phase delay R0 of the optical compensation film is greater than 130 nm and less than 550 nm. Therefore, the light-absorbing structure can be used to effectively improve the back-side light leakage problem of the display device. [Simplified Explanation of the Diagram]

[0007] Figure 1 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Figure 2 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Figure 3 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Figure 4 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Figure 5 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Figure 6A is a cross-sectional schematic diagram of a light control layer of a display device according to an embodiment of the present invention. Figure 6B is a cross-sectional schematic diagram of liquid crystal molecules in a light control layer according to an embodiment of the present invention. Figure 7 is a simulation diagram of the back-side leakage brightness and the phase retardation Rth and in-plane phase retardation R0 in the thickness direction of the first optical compensation film of a display device according to an embodiment of the present invention. Figure 8A is the relative brightness distribution of a display device according to an embodiment of the present invention at various viewing angles. Figure 8B is a graph of the tilt angle (theta) and back-side leakage of a display device according to an embodiment of the present invention when the azimuth angle (phi) is 0°. Figure 9A is the relative brightness distribution of a display device according to an embodiment of the present invention at various viewing angles. Figure 9B is a graph showing the tilt angle (theta) and back-side light leakage of a display device according to an embodiment of the present invention when the azimuth angle (phi) is 0°. Figure 10A shows the relative brightness distribution of a display device according to an embodiment of the present invention at various viewing angles. Figure 10B is a graph showing the tilt angle (theta) and back-side light leakage of a display device according to an embodiment of the present invention when the azimuth angle (phi) is 0°.

Claims

1. A light-absorbing structure for a display device, comprising: A light control layer, wherein the angle between the absorption axis of the light control layer and the normal direction of the light control layer is less than or equal to 10 degrees; The optical compensation layer includes a first optical compensation film superimposed on the light control layer, wherein the absolute value of the in-plane phase delay R0 of the first optical compensation film is greater than 130 nm and less than 550 nm; a second optical compensation film located on the first optical compensation film and between the light control layer and the second optical compensation film, wherein the angle between the slow axis of the first optical compensation film and the slow axis of the second optical compensation film is 60° to 120°; and a third optical compensation film located on the second optical compensation film and between the first and third optical compensation films, wherein the angle between the slow axis of the second optical compensation film and the slow axis of the third optical compensation film is 60° to 120°, and wherein the absolute values ​​of the in-plane phase delay R0 of the first optical compensation film, the second optical compensation film, and the third optical compensation film are in the range of 130 nm to 195 nm.

2. The light-absorbing structure as claimed in claim 1, wherein the R0 of the first optical compensation film is positive, and the first optical compensation film meets the following conditions: the phase retardation Rth in the thickness direction is less than 150 nm, and 130 nm < R0 < (340 + (150 - Rth) × cot 50°) nm; or the phase retardation Rth in the thickness direction is greater than 150 nm, and 130 nm < R0 < (340 + (Rth - 150) × cot 60°) nm.

3. The light-absorbing structure as claimed in claim 1, wherein the R0 of the first optical compensation film is negative, and the first optical compensation film meets the following conditions: the phase retardation Rth in the thickness direction is less than 150 nm, and -130 nm > R0 > -[(340+(150-Rth)×cot 50°)] nm; or the phase retardation Rth in the thickness direction is greater than 150 nm, and -130 nm > R0 > -[(340+(Rth-150)×cot 60°)] nm.

4. The light-absorbing structure as claimed in claim 1, wherein the light control layer comprises a plurality of liquid crystal molecules and a dye, wherein the angle between the direction of the long axis of the liquid crystal molecules and the normal direction of the light control layer is substantially less than or equal to 10 degrees.

5. The light-absorbing structure as claimed in claim 1, wherein the light-absorbing structure is disposed within or on a display panel.

6. A display device, comprising: A display panel has a first surface and a second surface opposite to the first surface, wherein the first surface is the display surface of the display panel; The display panel also includes a light-absorbing structure located on either the first or second surface of the display panel, comprising: a light control layer, wherein the angle between the absorption axis of the light control layer and the normal direction of the light control layer is less than or equal to 10 degrees, wherein the light control layer is configured to absorb P-waves in unpolarized light; a first optical compensation film superimposed on the light control layer, wherein the absolute value of the in-plane phase retardation R0 of the first optical compensation film is greater than 130 nm and less than 550 nm; and a second optical compensation film located on the first optical compensation film, wherein the angle between the slow axis of the first optical compensation film and the slow axis of the second optical compensation film is in the range of 30° to 60°, and the light control layer, the first optical compensation film, and the second optical compensation film are stacked sequentially along a direction from the second surface to the first surface.

7. The display device as claimed in claim 6, further comprising: An anti-reflective film is located on the first surface of the display panel, wherein the light-absorbing structure is located on the first surface of the display panel and the light-absorbing structure is located between the anti-reflective film and the display panel.

8. The display device as claimed in claim 6, further comprising: An anti-reflective film is located on the first surface of the display panel, wherein the light-absorbing structure is located on the second surface of the display panel, and the display panel is located between the anti-reflective film and the light-absorbing structure.

9. The display device as claimed in claim 6, wherein the first optical compensation film is located between the light control layer and the second optical compensation film, and the angle between the slow axis of the first optical compensation film and the slow axis of the second optical compensation film is in the range of 30° to 45°.

10. The display device as claimed in claim 6, wherein the light-absorbing structure is located on the second surface of the display panel, and the light-absorbing structure further comprises: A third optical compensation film is located on the light control layer, and the light control layer is located between the first optical compensation film and the third optical compensation film; And a fourth optical compensation film, located on the third optical compensation film, and the third optical compensation film is located between the light control layer and the fourth optical compensation film, wherein the angle between the slow axis of the third optical compensation film and the slow axis of the fourth optical compensation film is 30° to 60°.

11. The display device of claim 6, wherein the absolute value of the in-plane phase delay R0 of the first optical compensation film and the absolute value of the in-plane phase delay R0 of the second optical compensation film are in the range of 195 nm to 350 nm.

12. The display device as claimed in claim 6, wherein the display panel comprises: A circuit board having the second surface; a light-emitting diode electrically connected to the circuit board; And a cover plate having the first surface, wherein the light-emitting diode is located between the circuit board and the cover plate, wherein the light-absorbing structure is located on the first surface, and the light control layer is located between the first optical compensation film and the cover plate.

13. The display device as claimed in claim 6, wherein the display panel comprises: A circuit board having the second surface; a light-emitting diode electrically connected to the circuit board; The circuit board has a cover plate having the first surface, and the light-emitting diode is located between the circuit board and the cover plate, wherein the light-absorbing structure is located on the second surface, and the first optical compensation film is located between the light control layer and the circuit board.

14. The display device of claim 6, wherein the light control layer has a greater absorption rate of P-waves in the light emitted by the display panel than the absorption rate of S-waves in the light emitted by the display panel.

15. The display device as claimed in claim 6, wherein the first optical compensation film and the second optical compensation film are x+1 / 2 wavelength waveplates, and x is an integer greater than or equal to zero.

16. A light-absorbing structure for a display device, comprising: A light control layer, wherein the angle between the absorption axis of the light control layer and the normal direction of the light control layer is less than or equal to 10 degrees; A first optical compensation film is superimposed on the light control layer, wherein the in-plane phase delay R0 of the first optical compensation film is negative, and the absolute value of the in-plane phase delay R0 of the first optical compensation film is greater than 130 nm and less than 550 nm. The first optical compensation film meets the following conditions: the phase delay Rth in the thickness direction is less than 150 nm, and -130 nm > R0 > -[(340+(150-Rth)×cot 50°)] nm; or the phase delay Rth in the thickness direction is greater than 150 nm, and -130 nm > R0 > -[(340+(Rth-150)×cot 60°)] nm.

Images