Display device

Abstract

The invention provides a display device. The display device comprises a reflective liquid crystal display panel, an electric control liquid crystal box and a polaroid. And the electric control liquid crystal box is arranged on one side of the display surface of the reflective liquid crystal display panel. The polaroid is arranged on the side, away from the reflective liquid crystal display panel, of the electric control liquid crystal box. When the electronic control liquid crystal box is enabled, the display device is switched to the sharing mode operation from the peep-proof mode or switched to the peep-proof mode operation from the sharing mode.

Description

Technical Field

[0001] The present invention relates to a display device, and in particular to a display device with switchable viewing angles. Background Art

[0002] As displays become more and more popular, their additional added value becomes particularly important. For example, if the display panel used in a laptop or personal tablet has a switchable anti-peeping effect, it will inevitably be more popular with consumers or end customers. Since most of the current anti-peeping display devices are equipped with a transmissive display panel, it is often necessary to add an additional polarizer to achieve the anti-peeping display effect, resulting in a decrease in the overall light energy utilization rate of the display device. Summary of the invention

[0003] The present invention is directed to a display device which has an anti-peeping function that can be switched electrically and has a better light energy utilization rate.

[0004] According to an embodiment of the present invention, a display device includes a reflective liquid crystal display panel, an electrically controlled liquid crystal box and a polarizer. The electrically controlled liquid crystal box is arranged on one side of the display surface of the reflective liquid crystal display panel. The polarizer is arranged on the side of the electrically controlled liquid crystal box away from the reflective liquid crystal display panel. When the electrically controlled liquid crystal box is enabled, the display device switches from the anti-peeping mode to the sharing mode or from the sharing mode to the anti-peeping mode.

[0005] In a display device according to an embodiment of the present invention, an electrically controlled liquid crystal box includes a first substrate, a second substrate, a first alignment layer, a second alignment layer and a first liquid crystal layer. The first substrate and the second substrate are arranged to overlap each other. The first alignment layer is arranged on the first substrate. The second alignment layer is arranged on the second substrate. The first liquid crystal layer is sandwiched between the first alignment layer and the second alignment layer, and includes a plurality of first vertical alignment type liquid crystal molecules. When the electrically controlled liquid crystal box is enabled, the orthographic projection of the first molecular long axis of each first vertical alignment type liquid crystal molecule on the first substrate is parallel to or perpendicular to the viewing angle modulation direction of the display device.

[0006] In a display device according to an embodiment of the present invention, a reflective liquid crystal display panel includes a third substrate, a fourth substrate, a third alignment layer, a fourth alignment layer and a second liquid crystal layer. The third substrate and the fourth substrate are arranged to overlap each other. The third alignment layer is arranged on the third substrate. The fourth alignment layer is arranged on the fourth substrate. The second liquid crystal layer is sandwiched between the third alignment layer and the fourth alignment layer, and includes a plurality of second vertical alignment type liquid crystal molecules. When the reflective liquid crystal display panel is enabled, the orthographic projection of the second molecular long axis of each second vertical alignment type liquid crystal molecule on the third substrate is parallel to or perpendicular to the viewing angle modulation direction.

[0007] In the display device according to the embodiment of the present invention, when the electronically controlled liquid crystal box of the display device is disabled, the display device operates in the anti-peeping mode, and when the electronically controlled liquid crystal box is enabled, the display device operates in the sharing mode.

[0008] In the display device according to the embodiment of the present invention, at least one wave plate is further included, which is arranged between the polarizer and the electrically controlled liquid crystal box.

[0009] In the display device according to the embodiment of the present invention, at least one wave plate comprises a quarter wave plate. The angle between the transmission axis of the polarizer and the viewing angle modulation direction is 45 degrees. The angle between the optical axis of the quarter wave plate and the transmission axis of the polarizer is 45 degrees.

[0010] In a display device according to an embodiment of the present invention, at least one wave plate includes a quarter wave plate and a half wave plate. The quarter wave plate and the half wave plate have a first optical axis and a second optical axis, respectively. The angle between the transmission axis of the polarizer and the viewing angle modulation direction is 15 degrees. The angle between the first optical axis of the quarter wave plate and the viewing angle modulation direction is 0 degrees or 90 degrees. The angle between the second optical axis of the half wave plate and the viewing angle modulation direction is 30 degrees.

[0011] In the display device according to the embodiment of the present invention, the half wave plate is arranged between the quarter wave plate and the polarizer.

[0012] In the display device according to the embodiment of the present invention, a compensation film is further included, which is arranged between the polarizer and the electrically controlled liquid crystal box.

[0013] In the display device according to the embodiment of the present invention, the compensation film is a biaxial compensation film or a uniaxial compensation film.

[0014] Based on the above, in a display device of an embodiment of the present invention, an electrically controlled liquid crystal box is provided between the display surface of the reflective liquid crystal display panel and the polarizer. When the display device displays by reflecting the external ambient light, the display mode of the display device can be switched between the anti-peeping mode and the sharing mode by adjusting the phase delay of the electrically controlled liquid crystal box. Since the number of polarizers configured is one, the light energy loss when the display device performs display operation in the anti-peeping mode can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a display device according to a first embodiment of the present invention;

[0016] Figure 2A and Figure 2B yes Figure 1 A cross-sectional schematic diagram of a display device operating in different display modes;

[0017] Figure 3A yes Figure 2A A comparative distribution diagram when the display device operates in an anti-peeping mode;

[0018] Figure 3B yes Figure 2B A comparative distribution diagram of a display device when operating in a sharing mode;

[0019] Figure 4 is a schematic diagram of a display device according to a second embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of a display device according to a third embodiment of the present invention.

[0021] Description of Reference Numerals

[0022] 10, 10A, 10B: display device;

[0023] 100: reflective liquid crystal display panel;

[0024] 101, 102, 201, 202: substrate;

[0025] 111, 112, 211, 212: alignment layer;

[0026] 120, 220: liquid crystal layer;

[0027] 120M, 220M: vertical alignment liquid crystal molecules;

[0028] 131, 132, 231, 232: electrode layer;

[0029] 200: electronically controlled liquid crystal box;

[0030] A1, A1”, A2: angle;

[0031] CPF: compensation film;

[0032] DS: display surface;

[0033] LA1, LA2: long axis of the molecule;

[0034] OA, OA1, OA2: optical axis;

[0035] POL, POL-A: polarizer;

[0036] TA, TA”: penetration axis;

[0037] VMD: View Modulation Direction;

[0038] WP: wave plate;

[0039] WP1: quarter wave plate;

[0040] WP2: half wave plate;

[0041] X, Y, Z: direction. DETAILED DESCRIPTION

[0042] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0043] Figure 1 is a schematic diagram of a display device according to a first embodiment of the present invention. Figure 2A and Figure 2B yes Figure 1 Schematic cross-sectional view of a display device operating in different display modes. Figure 3A yes Figure 2A A comparative distribution diagram of the display device when operating in the anti-peep mode. Figure 3B yes Figure 2B A comparative distribution diagram of the display device when operating in the sharing mode.

[0044] Please refer to Figure 1 and Figure 2A The display device 10 includes a reflective liquid crystal display panel 100, an electrically controlled liquid crystal box 200, and a polarizer POL. The electrically controlled liquid crystal box 200 is disposed on one side of the display surface DS of the reflective liquid crystal display panel 100. The polarizer POL is disposed on the side of the electrically controlled liquid crystal box 200 away from the reflective liquid crystal display panel 100. In this embodiment, the display device 10 is suitable for utilizing external ambient light (such as sunlight or indoor light source) incident from one side of the polarizer POL to illuminate the reflective liquid crystal display panel 100 to achieve an image display effect. That is, the display device 10 of this embodiment is a reflective display.

[0045] First, it is explained that the configuration of the electronically controlled liquid crystal box 200 allows the display effect of the display device 10 to switch between the anti-peeping mode and the sharing mode. More specifically, the display device 10 of this embodiment has a viewing angle modulation direction VMD. When the electronically controlled liquid crystal box 200 is enabled, the display state of the display device 10 can be switched from the anti-peeping mode to the sharing mode, or from the sharing mode to the anti-peeping mode.

[0046] In this embodiment, the electrically controlled liquid crystal box 200 may include a substrate 201, a substrate 202, an alignment layer 211, an alignment layer 212, an electrode layer 231, an electrode layer 232, and a liquid crystal layer 220. The substrate 201 and the substrate 202 are arranged to overlap each other along a direction Z. The alignment layer 211 is arranged on the substrate 201. The alignment layer 212 is arranged on the substrate 202. The liquid crystal layer 220 is sandwiched between the alignment layer 211 and the alignment layer 212, and includes a plurality of vertically aligned liquid crystal molecules 220M. The electrode layer 231 is arranged between the substrate 201 and the alignment layer 211. The electrode layer 232 is arranged between the substrate 202 and the alignment layer 212.

[0047] For example, in this embodiment, the alignment directions of the alignment layer 211 and the alignment layer 212 may be parallel to the direction Y and are anti-parallel to each other, but the present invention is not limited thereto. In other embodiments, the alignment directions of the alignment layer 211 and the alignment layer 212 may be parallel to the direction X and are anti-parallel to each other. It is particularly noted that the alignment directions of the alignment layer 211 and the alignment layer 212 may define the viewing angle modulation direction VMD of the display device 10, and the viewing angle modulation direction VMD is parallel to the direction X.

[0048] In the present embodiment, the electrode layer 231 and the electrode layer 232 are respectively disposed on the corresponding substrate in the entire surface, that is, the two electrode layers can be conductive layers that are not patterned. The electrode layer 231 and the electrode layer 232 are, for example, light-transmitting electrodes, and the material of the light-transmitting electrodes can include metal oxides, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxides, or a stacked layer of at least two of the above.

[0049] When the two electrode layers of the electrically controlled liquid crystal cell 200 are disabled (eg Figure 2A As shown in FIG. 2 , the molecular long axis LA1 of the vertical alignment type liquid crystal molecules 220M of the liquid crystal layer 220 is arranged in a direction close to the normal direction of the alignment layer film surface (e.g., direction Z), that is, the liquid crystal layer 220 of this embodiment is composed of vertical alignment type (VA-type) liquid crystal molecules. More specifically, the molecular long axis LA1 of the vertical alignment type liquid crystal molecules 220M is arranged along the alignment direction of the alignment layer at an angle (i.e., pretilt angle) relative to the normal direction of the alignment layer film surface.

[0050] When the electrode layer 231 and the electrode layer 232 of the electrically controlled liquid crystal cell 200 are enabled and have a potential difference (eg Figure 2BAs shown in FIG. 2 , the vertically aligned liquid crystal molecules 220M (i.e., the liquid crystal layer 220 is a negative type liquid crystal) with negative dielectric anisotropy will be driven to rotate by the electric field formed between the two electrode layers, and their molecular long axis LA1 will tend to be arranged in the direction perpendicular to the electric field. In other words, the angle between the molecular long axis LA1 of the vertically aligned liquid crystal molecules 220M and the normal direction of the alignment layer film surface will be increased.

[0051] It should be noted that at this time, the orthographic projection of the molecular long axis LA1 of the vertically aligned liquid crystal molecule 220M on the substrate 201 is perpendicular to the viewing angle modulation direction VMD (e.g., parallel to the direction Y) of the display device 10. However, the present invention is not limited thereto. In another variant embodiment, the alignment directions of the alignment layer 211 and the alignment layer 212 may also be parallel to the direction X, so when the two electrode layers are enabled, the orthographic projection of the molecular long axis LA1 of the vertically aligned liquid crystal molecule 220M on the substrate 201 may also be parallel to the viewing angle modulation direction VMD of the display device 10.

[0052] On the other hand, the reflective liquid crystal display panel 100 may include a substrate 101, a substrate 102, an alignment layer 111, an alignment layer 112, an electrode layer 131, an electrode layer 132 and a liquid crystal layer 120. The substrate 101 and the substrate 102 are arranged to overlap each other along a direction Z. The alignment layer 111 is arranged on the substrate 101. The alignment layer 112 is arranged on the substrate 102. The liquid crystal layer 120 is sandwiched between the alignment layer 111 and the alignment layer 112, and includes a plurality of vertically aligned liquid crystal molecules 120M. The electrode layer 131 is arranged between the substrate 101 and the alignment layer 111. The electrode layer 132 is arranged between the substrate 102 and the alignment layer 112.

[0053] For example, in this embodiment, the alignment directions of the alignment layer 111 and the alignment layer 112 may be parallel to the direction Y and are anti-parallel to each other, but the present invention is not limited thereto. In other embodiments, the alignment directions of the alignment layer 111 and the alignment layer 112 may be parallel to the direction X and are anti-parallel to each other.

[0054] In the present embodiment, the electrode layer 131 may include a plurality of reflective electrodes arranged at intervals. These reflective electrodes may define a plurality of display pixel regions of the reflective liquid crystal display panel 100. The electrode layer 132 may be disposed on the substrate 102 in its entirety (i.e., the electrode layer 132 may be an unpatterned conductive layer). The material of the reflective electrode of the electrode layer 131 may include metal, alloy, nitride of metal material, oxide of metal material, oxynitride of metal material, or other suitable materials, or a stacked layer of metal material and other conductive materials. The electrode layer 132 is, for example, a light-transmitting electrode, and the material of the light-transmitting electrode may include metal oxide, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxides, or a stacked layer of at least two of the above.

[0055] For example, a pixel driving layer (not shown) electrically connected to a plurality of reflective electrodes (i.e., the electrode layer 131) may be further provided on the substrate 101. The pixel driving layer may include, for example, a plurality of scan lines, a plurality of data lines, and a plurality of active elements, wherein each active element may be electrically connected to a reflective electrode, a scan line, and a data line. Accordingly, the reflective liquid crystal display panel 100 may individually control the potentials of these reflective electrodes via the pixel driving layer, thereby modulating the amount of light emitted by the external ambient light (e.g., sunlight or indoor light source) after being reflected by different display pixel regions to achieve the effect of displaying an image.

[0056] When the two electrode layers of the reflective liquid crystal display panel 100 are disabled (eg Figure 2A As shown in FIG. 1 , the molecular long axis LA2 of the vertically aligned liquid crystal molecules 120M of the liquid crystal layer 120 is arranged in a direction close to the normal direction of the alignment layer film surface (e.g., direction Z). More specifically, the molecular long axis LA2 of the vertically aligned liquid crystal molecules 120M is arranged along the alignment direction of the alignment layer at an angle (i.e., a pretilt angle) relative to the normal direction of the alignment layer film surface.

[0057] When the electrode layer 131 and the electrode layer 132 of the reflective liquid crystal display panel 100 are enabled and have a potential difference (eg Figure 2B As shown in FIG. 1 , the vertically aligned liquid crystal molecules 120M (i.e., the liquid crystal layer 120 is a negative type liquid crystal) with negative dielectric anisotropy will be driven to rotate by the electric field formed between the two electrode layers, and their molecular long axis LA2 will tend to be arranged in the direction perpendicular to the electric field. In other words, the angle between the molecular long axis LA2 of the vertically aligned liquid crystal molecules 120M and the normal direction of the alignment layer film surface will be increased.

[0058] It should be noted that at this time, the orthographic projection of the molecular long axis LA2 of the vertically aligned liquid crystal molecule 120M on the substrate 101 is perpendicular to the viewing angle modulation direction VMD (e.g., parallel to the direction Y) of the display device 10. However, the present invention is not limited to this. In another variant embodiment, the alignment directions of the alignment layer 111 and the alignment layer 112 can also be parallel to the direction X, so when the two electrode layers are enabled, the orthographic projection of the molecular long axis LA2 of the vertically aligned liquid crystal molecule 120M on the substrate 101 can also be parallel to the viewing angle modulation direction VMD of the display device 10.

[0059] In the present embodiment, the polarizer POL has a transmission axis TA, and the angle A1 between the transmission axis TA and the viewing angle modulation direction VMD is, for example, 45 degrees. In addition, the display device 10 may further include at least one wave plate WP, which is disposed between the polarizer POL and the electrically controlled liquid crystal cell 200. For example, in the present embodiment, the wave plate WP is, for example, a quarter wave plate, and the angle between the optical axis OA of the quarter wave plate and the transmission axis TA of the polarizer POL is 45 degrees (i.e., the optical axis OA of the quarter wave plate is parallel to the viewing angle modulation direction VMD).

[0060] Figure 3A It shows that when the electronically controlled liquid crystal box 200 is disabled (eg Figure 2A ) when the display device 10 is at different azimuth angles (e.g., 0 to 359 degrees) and viewing angles (e.g., 0 to 90 degrees). It should be noted that the contrast distribution here is, for example, the ratio of the display brightness of each point within the above viewing angle distribution range to the minimum display brightness. The axial direction of the azimuth angle 0 and the azimuth angle 180 are Figure 1 The viewing angle modulation direction VMD of the display device 10 is shown in FIG. Figure 3A As shown, the preferred viewing angle range of the display device 10 at an azimuth angle of 0 degree, 90 degree, 180 degree or 270 degree is less than 45 degrees, that is, the display device 10 is performing display operation in the anti-peeping mode at this time.

[0061] Figure 3B When the electronically controlled liquid crystal box 200 is enabled (eg Figure 2B ), the contrast distribution of the display device at different azimuth angles (e.g., 0 degrees to 359 degrees) and viewing angles (e.g., 0 degrees to 90 degrees). Figure 3B It can be seen that the preferred viewing angle range of the display device 10 at an azimuth angle of 0 degree, 90 degrees, 180 degrees or 270 degrees is greater than 65 degrees, that is, the display device 10 is performing display operation in the sharing mode at this time.

[0062] In particular, Figure 3A and Figure 3BIt can be seen that the display device 10 of this embodiment has a switchable anti-peeping display function at the azimuth angles of 0 and 180, and also has a switchable anti-peeping display function at the azimuth angles of 90 and 270. However, it should be noted that in the sharing mode, the viewing angle range at the azimuth angles of 90 and 270 is smaller than the viewing angle range at the azimuth angles of 0 and 180.

[0063] Since the display device 10 of this embodiment only needs to be provided with one polarizer POL to achieve the image display effect, the light energy loss of the display device 10 when performing display operation in the anti-peeping mode can be greatly reduced. In other words, the light energy utilization rate of the display device 10 with the electronically controlled switchable anti-peeping function for the external ambient light can be improved.

[0064] Other embodiments will be listed below to explain the present disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the aforementioned embodiments and will not be repeated below.

[0065] Figure 4 is a schematic diagram of a display device according to a second embodiment of the present invention. Figure 4 The display device 10A of this embodiment and Figure 1 The display device 10 is different in that the number of wave plates is different and the transmission axes of the polarizers are axially different.

[0066] For example, in the present embodiment, the number of wave plates of the display device 10A is, for example, two, and they are a quarter wave plate WP1 and a half wave plate WP2. The optical axis OA1 of the quarter wave plate WP1 is parallel to the viewing angle modulation direction VMD, that is, the angle between the optical axis OA1 of the quarter wave plate WP1 and the viewing angle modulation direction VMD is 0 degrees. The angle A2 between the optical axis OA2 of the half wave plate WP2 and the viewing angle modulation direction VMD is 30 degrees. The angle A1" between the transmission axis TA" of the polarizer POL-A and the viewing angle modulation direction VMD can be 15 degrees.

[0067] However, the present invention is not limited thereto. In another variant embodiment, the angle between the optical axis OA1 of the quarter wave plate WP1 and the viewing angle modulation direction VMD may be 90 degrees, that is, the optical axis OA1 of the quarter wave plate WP1 is perpendicular to the viewing angle modulation direction VMD. In this embodiment, the half wave plate WP2 may be disposed between the quarter wave plate WP1 and the polarizer POL-A, but is not limited thereto. In another variant embodiment, the half wave plate WP2 may also be disposed between the quarter wave plate WP1 and the electrically controlled liquid crystal box 200.

[0068] Since the other components of the display device 10A are similar to Figure 1For detailed description of the display device 10, please refer to the relevant paragraphs of the aforementioned embodiment, which will not be repeated here.

[0069] Figure 5 is a schematic diagram of a display device according to a third embodiment of the present invention. Figure 5 The display device 10B of this embodiment is Figure 1 The difference between the display device 10 of the embodiment is that the display device 10B of the present embodiment further includes a compensation film CPF disposed between the polarizer POL and the electrically controlled liquid crystal box 200. The compensation film CPF can be a biaxial compensation film (e.g., a combination of an A plate and a C plate) or a uniaxial compensation film (e.g., an A plate, a C plate, or an O plate).

[0070] For example, in this embodiment, the compensation film CPF may be disposed between the polarizer POL and the wave plate WP, but the present invention is not limited thereto. In another variant embodiment, the compensation film CPF may also be disposed between the wave plate WP and the electrically controlled liquid crystal box 200. Since the other components of the display device 10A are similar to Figure 1 For detailed description of the display device 10, please refer to the relevant paragraphs of the aforementioned embodiment, which will not be repeated here.

[0071] In summary, in a display device of an embodiment of the present invention, an electrically controlled liquid crystal box is provided between the display surface of the reflective liquid crystal display panel and the polarizer. When the display device displays by reflecting external ambient light, the display mode of the display device can be switched between the anti-peeping mode and the sharing mode by adjusting the phase delay of the electrically controlled liquid crystal box. Since the number of polarizers configured is one, the light energy loss when the display device performs display operation in the anti-peeping mode can be greatly reduced.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, characterized in that: include: Reflective liquid crystal display panel; An electrically controlled liquid crystal box, arranged on one side of the display surface of the reflective liquid crystal display panel; as well as a polarizer, arranged on a side of the electrically controlled liquid crystal box away from the reflective liquid crystal display panel, When the electronically controlled liquid crystal box is enabled, the display device switches from the anti-peeping mode to the sharing mode or from the sharing mode to the anti-peeping mode.

2. The display device according to claim 1, characterized in that The electrically controlled liquid crystal box comprises: The first substrate and the second substrate are arranged overlapping each other; A first alignment layer, disposed on the first substrate; A second alignment layer is disposed on the second substrate; and The first liquid crystal layer is sandwiched between the first alignment layer and the second alignment layer and includes a plurality of first vertical alignment type liquid crystal molecules. When the electrically controlled liquid crystal cell is enabled, the orthographic projection of the first molecular long axis of each of the plurality of first vertically aligned liquid crystal molecules on the first substrate is parallel to or perpendicular to the viewing angle modulation direction of the display device.

3. The display device according to claim 2, characterized in that: The reflective liquid crystal display panel comprises: The third substrate and the fourth substrate are arranged to overlap each other; A third alignment layer is disposed on the third substrate; a fourth alignment layer, disposed on the fourth substrate; and The second liquid crystal layer is sandwiched between the third alignment layer and the fourth alignment layer and includes a plurality of second vertical alignment type liquid crystal molecules. When the reflective liquid crystal display panel is enabled, the orthographic projection of the second molecular long axis of each of the plurality of second vertical alignment type liquid crystal molecules on the third substrate is parallel to or perpendicular to the viewing angle modulation direction.

4. The display device according to claim 2, characterized in that: When the electrically controlled liquid crystal box is disabled, the display device operates in the anti-peeping mode, and when the electrically controlled liquid crystal box is enabled, the display device operates in the sharing mode.

5. The display device according to claim 2, characterized in that: Also includes: At least one wave plate is arranged between the polarizer and the electrically controlled liquid crystal box.

6. The display device according to claim 5, characterized in that The at least one wave plate comprises a quarter wave plate, wherein the angle between the transmission axis of the polarizer and the viewing angle modulation direction is 45 degrees, and the angle between the optical axis of the quarter wave plate and the transmission axis of the polarizer is 45 degrees.

7. The display device according to claim 5, characterized in that: The at least one wave plate comprises: a quarter wave plate having a first optical axis; and A half wave plate has a second optical axis, wherein the angle between the transmission axis of the polarizer and the viewing angle modulation direction is 15 degrees, the angle between the first optical axis of the quarter wave plate and the viewing angle modulation direction is 0 degrees or 90 degrees, and the angle between the second optical axis of the half wave plate and the viewing angle modulation direction is 30 degrees.

8. The display device according to claim 7, characterized in that: The half wave plate is arranged between the quarter wave plate and the polarizer.

9. The display device according to claim 5, characterized in that: Also includes: A compensation film is arranged between the polarizer and the electrically controlled liquid crystal box.

10. The display device according to claim 9, characterized in that: The compensation film is a biaxial compensation film or a uniaxial compensation film.

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