TWI422860B - Display system - Google Patents

Description

display system

The present invention relates to a display system, and more particularly to a display system that eliminates ghosting.

In order to improve the driving safety of motorists, cars have been designed to project driving information such as vehicle speed or motor speed on the windshield for display to the driver. However, in today's technology, whether it is virtual image imaging or real image imaging, it often faces the problem of image ghosting, which makes the driver unable to clearly identify the display on the windshield. Driving information.

A variety of techniques for eliminating ghosting have been proposed. In U.S. Patent No. 5,999,314, a half-wave plate is placed in the middle of the windshield to eliminate ghosting. This method requires an additional Brewster film to meet the low brightness loss, and the windshield must be specially processed.

In addition, a method of inserting a one-half wave plate into a windshield is disclosed in U.S. Patent No. 5,212,471.

A method of placing a reflective polarizer in a windshield is mentioned in U.S. Patent No. 7,123,418. This reflective polarizer blocks light entering from the outside, making it impossible for the driver to see through the scene behind the reflective polarizer.

The invention provides a display system comprising an image device, a transparent substrate, and a phase difference plate. The imaging device is configured to generate a polarized image light. The light transmissive substrate has a first surface and a second surface. The phase difference plate is disposed on the first surface of the light transmissive substrate. Wherein, part of the polarized image light is reflected by the phase difference plate, and is emitted toward a direction of observation, and after the other part of the polarized image light passes through the phase difference plate, most of the light is emitted from the second surface.

The invention provides a display system comprising an image device, an image reflecting element and a polarizing element. The imaging device is configured to generate a polarized image light. The image reflecting element comprises a substrate and a phase modulation element. The phase modulation element abuts the substrate, and the phase modulation element has a reflective surface for receiving polarized image light. After the polarized image light is incident on the reflective surface, the reflective surface reflects a portion of the polarized image light to generate a first reflected polarized image light, and part of the polarized image light is incident on the phase modulation element, and is reflected by the substrate and then emitted by the reflective surface. To generate a second reflected polarized image light. The phase difference between the first reflected polarized image light and the second reflected polarized image light is substantially nπ, and n is a positive odd number. The polarizing element is configured to receive and pass the first reflected polarized image light and block the second reflected polarized image light.

The invention provides a display system comprising an image device, a transparent substrate and a phase modulation component. The imaging device is configured to generate a polarized image light. The phase modulation element is adjacent to the transparent substrate, and the phase modulation element has a reflective surface for receiving polarized image light. When the polarized image light is incident on the reflective surface, the reflective surface reflects a portion of the polarized image light to generate a reflected polarized image light, and a portion of the polarized image light is incident on the phase modulation element to become an incident polarized image light. The incident polarized image light has a desired polarization direction such that most of the incident polarized image light penetrates the light transmissive substrate.

In order to make the above-mentioned contents of the present invention more comprehensible, the preferred embodiments are described below, and the detailed description is as follows:

The invention discloses a display system comprising an image device, a transparent substrate, and a phase difference plate. The imaging device is configured to generate a polarized image light. The light transmissive substrate has a first surface and a second surface. The phase difference plate is disposed on the first surface of the light transmissive substrate. Wherein, part of the polarized image light is reflected by the phase difference plate, and is emitted toward a direction of observation, and after the other part of the polarized image light passes through the phase difference plate, most of the light is emitted from the second surface.

Embodiment 1

Please refer to FIG. 1 , which is a schematic diagram of a display system according to a first embodiment of the present invention. In this embodiment, the phase difference plate is a quarter wave plate, the light transmissive substrate is a glass substrate, and the polarized image light is circularly polarized image light or elliptically polarized image light. As shown in FIG. 1, the display system 100 includes an imaging device 102, a glass substrate 130, and a quarter-wave plate 110. The glass substrate 130 has a first surface 130A and a second surface 130B. The quarter wave plate 110 is disposed on the first surface 130A of the glass substrate 130. The quarter wave plate 110 has a relatively upper surface 110B and a lower surface 110A.

The circularly polarized image light or the elliptically polarized image light generated by the image device 102 is directed toward the quarter wave plate 110 in such a manner that the incident angle θ1 is the Brewster angle. After the partially polarized image light or the elliptically polarized image light is reflected by the lower surface 110A of the quarter wave plate 110, it is emitted toward an observation direction D1, so that the observer 104 can see the corresponding image. The other portions of the circularly polarized image light or the elliptically polarized image light penetrate the quarter wave plate 110 and are directed toward the glass substrate 130.

The circularly polarized image light or the elliptically polarized image light processed by the quarter wave plate 110 converts linearly polarized light, such as P-polarized image light. The P-polarized image light is emitted from the upper surface 110B of the quarter-wave plate 110 and is incident on the glass substrate 130. Since the incident angle θ1 of the circularly polarized image light or the elliptically polarized image light on the quarter wave plate 110 is a Brewster angle, and the first surface 130A and the second surface 130B are substantially parallel, the first light is incident on the glass substrate 130. At the time of the two surfaces 130B, the incident angle θ2 will also be the Brewster angle. As such, the P-polarized image light that is directed by the quarter-wave plate 110 toward the second surface 130B of the glass substrate 130 will pass mostly through the second surface 130B to exit the glass substrate 130.

Thus, since most of the polarized image light incident on the glass substrate 130P will be emitted from the glass substrate 130, the P-polarized image light reflected by the second surface 130B will be small, and thus the observer 140 will hardly see it. The light reflected by the glass substrate 130 can effectively avoid the generation of ghosts.

Furthermore, the image device 102 can be realized by a display capable of directly generating circularly polarized image light or elliptically polarized image light. Alternatively, imaging device 102 can be implemented by a display 120 and a quarter-wave plate 150. The quarter wave plate 150 is disposed on the image light emitting side of the display 120. In the present embodiment, the quarter wave plate 150 is disposed adjacent to the display 120. After the original image light is emitted from the display 120 via the quarter-wave plate 150, circularly polarized image light or elliptically polarized image light is generated to be directed toward the quarter-wave plate 110. The original image light is, for example, S-polarized image light. The S-polarized image light emitted by the display 120 is processed by the quarter-wave plate 150 to produce the above-described circularly polarized image light or elliptically polarized image light.

By using the quarter-wave plate 150, the S-polarized image light emitted by the display 120 can be compensated, so that the P-polarized image light transmitted in the glass substrate 130 is purer P-polarized image light, thereby eliminating Ghosting works better.

The display system 100 further includes an angle adjusting device 104 for adjusting the angle of the optical axis 150a of one of the quarter wave plates 150 with respect to the optical axis 120a of the image polarizing plate of the display 120. As shown in Fig. 3, this angle is, for example, between about 35 and 55 degrees. The angle adjustment device 104 can be a rotating mechanism, such as a rotatable disk that can carry a quarter wave plate 150. The angle adjusting device 104 may also be a clamping mechanism, for example, a clamping mechanism that can hold both sides of the quarter wave plate 150 for rotation.

The quarter-wave plate 110 is a birefringent material which can be disposed on the glass substrate 130 by abutting, pasting or sputtering, and is located between the glass substrate 130 and the viewer 140. The quarter-wave plate 110 can also be replaced with a phase difference plate having a similar function as the quarter-wave plate 110. Compared with the conventional method of inserting a half-wave plate or a reflective polarizer into the middle of the windshield through a special process, the present embodiment has the advantages that the process is easy and easy to implement on the product.

Embodiment 2

Please refer to FIG. 2, which is a schematic diagram of a display system according to a second embodiment of the present invention. Different from the first embodiment, this embodiment is described by taking a phase difference plate as a half wave plate and polarized image light as linear polarization image light. This linearly polarized image light is, for example, S-polarized image light. As shown in FIG. 2, the display system 300 includes an imaging device 302, a glass substrate 330, and a half-wave plate 310. The glass substrate 330 has a first surface 330A and a second surface 330B. The half wave plate 310 is disposed on the first surface 330A of the glass substrate 330. The half wave plate 310 has a relatively upper surface 310B and a lower surface 310A.

The S-polarized image light generated by the image device 302 is directed toward the half-wave plate 310 at an incident angle θ3 of the Brewster angle. After the partial S-polarized image light is reflected by the lower surface 310A of the half-wave plate 310, it is emitted toward the observation direction D2, so that the observer 304 can see the corresponding image. The other portions of the S-polarized image light will penetrate the half-wave plate 310 and be directed toward the glass substrate 330.

The S-polarized image light processed by the half-wave plate 310 converts the P-polarized image light. The P-polarized image light is emitted from the upper surface 310B of the half-wave plate 310 and is incident on the glass substrate 330. Since the incident angle θ3 of the S-polarized image light on the half-wave plate 310 is the Brewster angle, and the first surface 330A and the second surface 330B are substantially parallel, when the second surface 330B of the glass substrate 330 is incident, The angle of incidence θ4 will also be the Brewster angle. As such, the P-polarized image light that is directed by the one-half wave plate 310 toward the second surface 330B of the glass substrate 330 will pass mostly through the second surface 330B to exit the glass substrate 330.

Thus, since most of the P-polarized image light incident on the glass substrate 330 will be emitted from the glass substrate 330, the P-polarized image light reflected by the second surface 330B will be small, and thus the observer 340 will hardly see. The light reflected by the glass substrate 330 can effectively avoid the generation of ghosts.

Further, the image device 302 is realized by a display 320 and a quarter wave plate 350. The quarter-wave plate 150 is disposed on the image light exiting side of the display 120. In the present embodiment, the quarter-wave plate 350 is disposed adjacent to the display 320. After the original image light is emitted from the display 320 via the quarter-wave plate 350, elliptically polarized image light close to the S-polarization state is generated to be directed toward the half-wave plate 310. The original image light is, for example, S-polarized image light. The quarter-wave plate 350 will compensate the S-polarized image light emitted by the display 320 to make the P-polarized image light in the half-wave plate 310 more purified, thereby eliminating ghosting. The effect is better.

The display system 300 can further include an angle adjustment device 304 for adjusting the angle of the optical axis 350a of one of the quarter wave plates 350 relative to the optical axis 320a of the image polarizer of the display 320. As shown in Fig. 4, this angle is, for example, between about -10 degrees and 10 degrees. The angle adjustment device 304 can be a rotating mechanism, such as a rotatable disk that can carry a quarter wave plate 350. The angle adjustment device 304 can also be a clamping mechanism, such as a clamping mechanism that can rotate the sides of the quarter wave plate 350.

The above-mentioned half-wave plate 310 is a birefringent material which can be disposed on the glass substrate 330 by abutting, pasting or sputtering, and is located between the glass substrate 330 and the observer 340. The half-wave plate 310 can also be replaced with a phase difference plate having a similar function to the one-half wave plate 310. Compared with the conventional method of inserting a half-wave plate or a reflective polarizer into the middle of the windshield through a special process, the present embodiment has the advantages that the process is easy and easy to implement on the product.

Embodiment 3

Please refer to FIG. 5, which is a schematic diagram of a display system according to Embodiment 3 of the present invention. As shown in FIG. 5, the display system 500 includes an image reflecting element 510 and a polarizing element 520. The image reflective element 510 includes a substrate 512 and a phase modulation element 514 that is adjacent to the substrate 512. Phase modulation element 514 has a reflective surface 514a.

As shown in FIG. 5, the ghost removing device 500 and the image forming device 502 constitute a display system 1. Image device 502 produces a polarized image light P1. The image device 502 can be a liquid crystal display panel, and the polarized image light P1 can be generated by the liquid crystal display panel. The image device 502 can also be an image polarizing component coupled with an image generating device. The polarized image light P1 is generated by the image generating device. The image light is generated after passing through the image polarizing element. The reflective surface 514a is for receiving the polarized image light P1. After the polarized image light P1 is reflected by the reflective surface 514a, the reflective surface 514a reflects a portion of the polarized image light P1 to generate the first reflected polarized image light P2. Part of the polarized image light P1 is incident on the phase modulation element 514 and reflected by the substrate 512, and then emitted by the reflective surface 514a to generate the second reflected polarized image light S2.

To further illustrate, the polarized image light P1 is a linearly polarized image light, for example, a P-type linearly polarized image light, that is, the polarization direction of the light is parallel to the plane formed by the traveling direction of the incident light and the reflected light; An S-type linearly polarized image light, that is, a polarization direction of the light is perpendicular to a plane formed by the traveling directions of the incident light and the reflected light. In the present embodiment, the polarized image light P1 is exemplified by P-type linearly polarized image light. However, the embodiment is not limited thereto, and the polarized image light may be a linearly polarized image light that is not a P-type or an S-type, or may be a circularly polarized image light or an elliptically polarized image light.

Preferably, the substrate 512 is, for example, a light transmissive substrate such as a transparent glass plate or a transparent plastic plate. The phase modulation element 514 is, for example, a quarter-wave plate formed of a polymer material attached to the substrate 512. Alternatively, the phase modulation element 514 may be a quarter-wave coating coated on the substrate 512. . Therefore, when part of the polarized image light P1 enters the phase modulation element 514 and is reflected by the substrate 512 and then exits the phase modulation element 514, the generated second reflected polarized image light S2 and the original polarized image light P1 are generated 180 degrees ( π) phase delay or phase difference; or, a phase delay or phase difference of nπ is generated between the second reflected polarized image light S2 and the original polarized image light P1, where n is a positive odd number of 1, 3, 5, .... Therefore, the polarization directions of the first reflected polarized image light P2 and the second reflected polarized image light S2 are substantially perpendicular to each other. That is, the second reflected polarized image light S2 is an S-type linearly polarized image light.

As shown in FIG. 5, the first reflected polarized image light P2 and the second reflected polarized image light S2 are simultaneously incident on the polarizing element 520. Preferably, the polarizing element 520 is, for example, a P-type polarizing plate, so that the first reflected polarized image light P2 can be allowed to pass through the received polarized image light P3 while blocking the second reflected polarized image light S2. Similarly, even if part of the polarized image light P1 passes through the phase modulation element 514, it is reflected by the reflective surface 512a of the substrate 512 and passes through the phase modulation element 514 to generate a third reflected polarized image light S3, and the third reflected polarized image light S3. The polarization direction is still substantially perpendicular to the polarization direction of the first reflected polarized image light P2, and therefore cannot pass through the polarizing element 520. However, although the present embodiment is described by taking a quarter-wave plate as an example, the present invention is not limited thereto. As long as the delay wavelength of the wavelength plate satisfies the relation (1), the same phase delay can be caused:

Where n is a non-negative integer containing 0, and λ represents the wavelength of the second reflected polarized image light.

In addition, even if the polarized image light may be a linearly polarized image light that is not P-type or S-type, the polarization direction of the first reflected polarized image light and the second reflected polarized image light that passes through the quarter-wave plate twice will be perpendicular to each other. . Therefore, as long as the polarization axis of the polarizing element 520 is adjusted to coincide with the polarization direction of the first reflected polarized image light, the polarizing element 520 can pass the first reflected polarized image light and block the second reflected polarized image light.

In addition, if the polarized image light is circular or elliptical polarized image light, the first reflective polarized image light and the second reflected polarized image light passing through the quarter wave plate twice have opposite optical directions. Therefore, as long as a circular polarizing plate having the same optical rotation direction as the first reflected polarized image light is used as the polarizing element, the circular polarizing plate can still pass the first reflected polarized image light and block the second reflected polarized image light.

In addition, although the linear polarization image light is taken as an example, the present embodiment is applicable to circularly polarized image light and elliptically polarized image light. As long as the first reflected light and the second reflected light respectively have different polarization directions when passing through the polarizing unit 520, the polarizing unit 520 can pass the first reflected polarized image light and filter out the second reflected polarized image light. The scope of protection of the invention.

Therefore, as long as the reflected polarized image light that has passed through the phase modulation element 514 can be filtered through the polarizing element 520, the multi-reflected light is prevented from forming a ghost image.

In addition, if the polarized image light P1 is colored light, the wavelength of the phase modulation element 514 can be selected according to the phase modulation characteristic of the phase modulation element to change the phase of the light wavelength to perform phase modulation design to reduce the color difference. The production.

Embodiment 4

Please refer to FIG. 6 , which is a schematic diagram of a display system according to Embodiment 2 of the present invention. As shown in FIG. 3, the ghost removing device 600 includes a transparent substrate 610 and a phase modulation element 620, and the phase modulation element 620 is adjacent to the transparent substrate 610. Phase modulation element 620 has a reflective surface 620a.

As shown in FIG. 6, ghost removal device 600 and image device 602 form a display system 3, that is, a heads up display. The image device 602 generates polarized image light TE1. The reflective surface 620a receives the polarized image light TE1, and the reflective surface 620a reflects a portion of the polarized image light TE1 to generate the reflected polarized image light TE2. Part of the polarized image light TE1 enters the phase modulation element 620 and becomes incident polarized image light TM2. The incident polarized image light TM2 is adjusted by the phase modulation element 620 to have a desired polarization direction such that most of the incident polarized image light TM2 is incident on the transparent substrate 610. The image device 602 can be a liquid crystal display panel, and the polarized image light TE1 is generated by the liquid crystal display panel. The image device 602 can also be an image polarizing element coupled with an image generating device. The polarized image light TE1 is an image generated by the image generating device. Light is produced after passing through the image polarizing element. Preferably, the polarized image light TE1 is linearly polarized image light. In this embodiment, the polarized image light TE1 also belongs to the TE electromagnetic wave, that is, the electromagnetic wave whose polarization direction is perpendicular to the incident plane.

Preferably, the transparent substrate 610 is one of a glass plate and a transparent plastic plate. The phase modulation element 620 is one of the 1/2 wavelength plates disposed on the transparent substrate 610; or the phase modulation element 620 is a 1/2 wavelength coating applied to the transparent substrate 610. If the reflected polarized image light TE2 belongs to the TE electromagnetic wave, as shown in FIG. 3, after a part of the polarized image light TE1 is incident on the phase modulation element 620, a phase delay of nπ is generated between the incident polarized image light TM2 and the reflected polarized image light TE2. Or a phase difference, where n is a positive odd number of 1, 3, 5.... The incident polarized image light TM2 modulated by the phase modulation element 620 belongs to the TM electromagnetic wave, that is, the electromagnetic wave whose polarization direction is parallel to the incident plane.

As shown in Fig. 6, the incident polarized image light TM2 enters the light-transmitting substrate 610 at an incident angle θ. When the incident angle θ of the incident polarized image light TM2 enters the transparent substrate 610, and the difference between the Brewster's angle between the phase modulation element 220 and the transparent substrate 210 is less than about 15 degrees, the incident polarized image light TM2 Since it belongs to the TM electromagnetic wave, the incident polarized image light TM2 can enter the transparent substrate 610 with extremely low reflectance and be emitted through the transparent substrate 610. Therefore, most of the incident polarized image light TM2 entering the phase modulation component 620 is no longer reflected by the transparent substrate 610 into the viewer's eye, so that the ghost phenomenon caused by the unwanted reflected image light can be effectively eliminated.

Further, when the incident angle θ is close to the Brewster angle between the phase modulation element 620 and the light-transmitting substrate 610, the incident polarized image light TM2 can pass through the light-transmitting substrate 610 with almost no reflection. Please refer to FIG. 7 , which illustrates the reflectance of the ghost removing device of the second embodiment of the present invention for TE electromagnetic waves and TM electromagnetic waves at different incident angles. As shown in FIG. 4, the area I represents the situation in which light enters the phase modulation element 620 from the light-transmitting substrate 610, and the area II represents the situation in which light enters the light-transmitting substrate 610 from the phase modulation element 620. In this embodiment, the phase modulation element 620 is made of a polymer material, and the transparent substrate 610 is made of a transparent glass plate. Thus, in the context of Region II, as shown by curve 401, the Brewster angle θ _B of the TM electromagnetic wave is approximately 56 degrees. Therefore, when the incident angle θ is between 40 and 70 degrees, the reflectance of the incident polarized image light TM2 from the phase modulation element 620 into the transparent substrate 610 is less than 10%. It can be seen that the image device 602 can appropriately adjust its position so that the incident angle θ of the incident polarized image light TM2 is as close as possible to the Brewster angle θ _B to reduce the ratio of the reflected polarized image light TM2. When the refractive index of the medium at the incident end is n _i and the refractive index of the medium at the exit end is n _t , the Brewster angle θ _B can be calculated by the formula (2):

However, although the phase modulation element of the present embodiment is described by taking a 1/2 wavelength plate as an example, the present invention is not limited thereto. As long as the delay wavelength of the wavelength plate satisfies the relation (3), the same phase delay can be caused:

Where n is a non-negative integer containing 0, and λ represents the wavelength of incident polarized image light.

In addition, if the polarized image light is a circularly polarized image light or an elliptically polarized image light, the phase modulation component may be disposed on one of the 1/4 wavelength plates on the transparent substrate 610 or coated on the transparent substrate 610. One 1/4 wavelength coating. Therefore, part of the polarized image light is incident on the phase modulation element, and the incident polarization image light is converted into linearly polarized image light, and the polarization direction thereof is adjusted to TM electromagnetic wave. Therefore, as long as the incident polarized image light is incident on the transparent substrate 610 at an angle close to the Brewster angle between the phase modulation element and the transparent substrate 610, the effect of reducing the reflectance can be achieved.

In addition, even if the polarized image light TE1 is colored light, the wavelength of the phase modulation element 614 can be selected according to the phase modulation characteristic of the phase modulation element to change the phase of the light wavelength, and the phase modulation can be designed to reduce the color difference. Produced while maintaining the low reflectivity of most incident polarized image light.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100, 300, 500, 600. . . display system

102, 202, 502, 602. . . Imaging device

104, 304. . . Angle adjustment device

110, 310. . . Quarter wave plate

110A, 310A. . . lower surface

110B, 310B. . . Upper surface

120, 320. . . monitor

130, 330. . . glass substrate

130A, 330A. . . First surface

130B, 330B. . . Second surface

140, 340. . . Observer

150, 350. . . Quarter wave plate

150a, 350a. . . Optical axis of quarter wave plate

120a, 320a. . . Optical axis of the image polarizer of the display

514a, 620a. . . Reflective surface

502, 602. . . Imaging device

100, 200. . . Ghost elimination device

510. . . Image reflection element

512. . . Substrate

514, 620. . . Phase modulation component

520. . . Polarizing element

210. . . Light transmissive substrate

401. . . curve

1 is a schematic view showing a display system of a first embodiment of the present invention.

2 is a schematic view showing a display system of a second embodiment of the present invention.

Fig. 3 is a view showing an example of the relationship between the optical axis of the quarter-wave plate of Fig. 1 and the optical axis of the image polarizing plate of the display.

Fig. 4 is a view showing an example of the relationship between the optical axis of the quarter-wave plate of Fig. 2 and the optical axis of the image polarizing plate of the display.

Figure 5 is a schematic view showing a display system of a third embodiment of the present invention.

Figure 6 is a schematic view showing a display system of a fourth embodiment of the present invention.

Figure 7 is a diagram showing the reflectance of the ghost removing device of the fourth embodiment of the present invention for TE electromagnetic waves and TM electromagnetic waves at different incident angles.

100. . . display system

102. . . Imaging device

104. . . Angle adjustment device

110. . . Quarter wave plate

110A. . . lower surface

110B. . . Upper surface

120. . . monitor

130. . . glass substrate

130A. . . First surface

130B. . . Second surface

140. . . Observer

150. . . Quarter wave plate

Claims (22)

A display system includes: an image device for generating a polarized image light; a light transmissive substrate having a first surface and a second surface; and a phase difference plate disposed on the light transmissive substrate a surface; wherein a portion of the polarized image light is reflected by the phase difference plate, and is emitted toward an observation direction, and the other portion of the polarized image light passes through the phase difference plate, and is mostly The second surface is emitted, wherein the image device has a display, a quarter-wave plate and an angle adjusting device, and the quarter-wave plate is disposed adjacent to the display and placed on the angle adjusting device. The angle adjusting device is configured to adjust an angle of an optical axis of the quarter wave plate relative to the display. The display system of claim 1, wherein the phase difference plate is a half wave plate. The display system of claim 1, wherein the phase difference plate is a quarter wave plate. The display system of claim 1, wherein the polarized image light is linearly polarized image light. The display system of claim 1, wherein the polarized image light is S-polarized image light. The display system of claim 1, wherein the polarized image light is circularly polarized image light. The display system of claim 1, wherein the polarized image light is elliptically polarized image light. The display system of claim 1, wherein the transparent substrate is a glass substrate. A display system includes: an image device for generating a polarized image light; an image reflecting element comprising: a substrate; and a phase modulation element adjacent to the substrate, the phase modulation element having a reflective surface, Receiving the polarized image light, wherein when the polarized image light is incident on the reflective surface, the reflective surface reflects a portion of the polarized image light to generate a first reflected polarized image light, and a portion of the polarized image light enters the phase The modulation element is reflected by the substrate and emitted from the reflective surface to generate a second reflected polarized image light, and the phase difference between the first reflected polarized image light and the second reflected polarized image light is substantially n π, n is a positive odd number; and a polarizing element for receiving and passing the first reflected polarized image light and blocking the second reflected polarized image light. The display system of claim 9, wherein the substrate is a light transmissive substrate. The display system of claim 9, wherein the phase modulation component is a quarter-wave plate or a 1/4 wavelength coating disposed on the substrate. The display system of claim 9, wherein the display is a liquid crystal display panel, and the polarized image light is generated by the liquid crystal display panel. The display system of claim 9, wherein the polarized image light is a linearly polarized image light, a circularly polarized image light, or an elliptically polarized image light. A display system includes: an image device for generating a polarized image light; a light transmissive substrate; and a phase modulation element adjacent to the light transmissive substrate, the phase modulation element having a reflective surface for receiving the Polarized image light, wherein when the polarized image light is incident on the reflective surface, the reflective surface reflects a portion of the polarized image light to generate a reflected polarized image light, and a portion of the polarized image light is incident on the phase modulation element An incident polarized image light having a desired polarization direction such that a majority of the incident polarized image light penetrates the light transmissive substrate, the image device having a display, a quarter wave a plate and an angle adjusting device disposed adjacent to the display and placed on the angle adjusting device, wherein the angle adjusting device is configured to adjust an optical axis of the quarter wave plate relative to the display The angle. The display system of claim 14, wherein the transparent substrate is one of a transparent glass plate and a transparent plastic plate. The display system of claim 14, wherein the polarized image light is a linearly polarized image light, and the phase modulation component is a 1/2 wavelength plate or a 1/2 wavelength coating. On the light transmissive substrate. The display system of claim 14, wherein The polarized image light is a circularly polarized image light or an elliptically polarized image light. The phase modulation component is a 1/4 wavelength plate or a 1/4 wavelength coating layer disposed on the transparent substrate. The display system of claim 14, wherein the display is a liquid crystal display panel, and the polarized image light is generated by the liquid crystal display panel. The display system of claim 14, wherein the polarized image light system is a TE electromagnetic wave. The display system of claim 14, wherein an incident angle of the incident polarized image light toward the transparent substrate, and a Brewster's angle between the phase modulation element and the transparent substrate The difference is less than 15 degrees. The display system of claim 14, wherein the incident angle of the incident polarized image light to the transparent substrate is substantially the Brewster angle between the phase modulation element and the transparent substrate. The display system of claim 14, wherein the desired polarization direction is substantially the same as the polarization direction of the TM electromagnetic wave.