JP2020012986A - Display unit - Google Patents

Abstract

To provide a display unit that can improve efficiency in use of light energy.SOLUTION: A display unit (10) comprises a display element (22) that is irradiated with light and through which linearly polarized light transmits. When light transmitting through a partial area of the display element (22) is first display light (L1), and light transmitting through another area of the display element (22) is second display light (L2), a polarizing plate (25) through which the second light (L2) transmitting through the display element (22) transmits is arranged on a light path of the second display light (L2). The polarizing plate (25) reflects light provided with a phase difference of λ/2 with respect to an electric field vibration direction of the second display light (L2) transmitting through the display element (22).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device capable of providing information by projecting light onto a screen unit.

  2. Description of the Related Art A vehicle may be equipped with a display device (head-up display device) that projects light onto a screen unit such as a windshield to provide necessary information to a driver. The display device is provided with an optical element that guides light emitted from the light source to the screen unit. As a conventional technique of such a display device, there is a technique disclosed in Patent Document 1.

  A display device as disclosed in Patent Document 1 includes a display element that is irradiated with light and transmits light, a half mirror that receives light transmitted through a partial area of the display element, and a display that is directed toward the half mirror. A reflection mirror for reflecting light transmitted through another region of the element.

  Light transmitted through a part of the area is reflected by a half mirror and projected on a windshield.

  On the other hand, the light transmitted through other areas is transmitted through the half mirror via the reflection mirror, and is projected on the windshield. Since the light passes through the reflection mirror, the optical path of the light transmitted through the other area is longer than the optical path of the light transmitted through the partial area by the distance between the reflection mirror and the half mirror.

  The driver recognizes a first image when light transmitted through a partial area is projected on the windshield, and recognizes a second image when light transmitted through another area is projected on the windshield. Since the optical path of the light transmitted through the other area is longer, the second image is recognized on the far side (front) than the first image.

JP 2013-214008 A

  A display device as disclosed in Patent Document 1 uses a half mirror. The half mirror reflects a part of the irradiated light and transmits the remaining part. For this reason, the light projected on the screen becomes weaker than when transmitted through the display element. For this reason, light energy use efficiency is poor.

  An object of the present invention is to provide a display device capable of improving the use efficiency of light energy.

According to the first aspect of the present invention, there is provided a display device including a display element that is irradiated with light and transmits linearly polarized light, and projects light transmitted through the display element onto a screen unit.
When light transmitted through a partial region of the display element is defined as first display light, and light transmitted through another region of the display element is defined as second display light,
On the optical path of the second display light,
A polarizing plate through which the second display light transmitted through the display element passes;
A 波長 wavelength plate that receives the second display light transmitted through the polarizing plate and provides a を λ phase difference in the electric field oscillation direction of the incident second display light;
A reflecting mirror that reflects the second display light transmitted through the こ の wavelength plate toward the polarizing plate via the 波長 wavelength plate;
Is placed,
A display device is provided, wherein the polarizing plate reflects light having a phase difference of λ / 2 with respect to the direction of electric field oscillation of the second display light transmitted through the display element. .

  As described in claim 2, preferably, the second display light reflected by the reflection mirror and incident on the polarizing plate is S-polarized light.

  In the invention according to the first aspect, a reflection mirror that reflects the second display light transmitted through the quarter-wave plate toward the polarizing plate via the quarter-wave plate is arranged. Further, the polarizing plate reflects light having a phase difference of λ / 2 with respect to the direction of electric field oscillation of the second display light transmitted through the display element. With the reflection mirror arranged as described above, the second display light transmitted through the display element passes through the same quarter-wave plate twice before passing through the display element and reaching the polarizing plate. It will be transmitted. That is, a phase difference of １ ／ λ × 2 is given to the electric field vibration direction. As a result, the second display light reciprocates between the polarizing plate and the reflecting mirror, and is reflected by the polarizing plate. The optical path of the second display light is longer than the optical path of the first display light by the reciprocation of the polarizing plate and the reflection mirror. Further, such a configuration eliminates the need for a half mirror. That is, the optical path of the second display light can be lengthened without using a half mirror. In a display device in which the length of the optical path of the first display light and the length of the optical path of the second display light are different from each other, it is possible to suppress the light projected on the screen from being weakened. That is, the use efficiency of light energy can be improved.

  In the invention according to claim 2, the second display light reflected by the reflection mirror and incident on the polarizing plate is S-polarized light. S-polarized light has a higher reflectance at reflection at the interface than P-polarized light vibrating in the direction perpendicular to the incident surface. That is, by making the second display light incident on the polarizing plate S-polarized light, it is possible to further suppress the light projected on the screen unit from being weakened. That is, the light energy use efficiency can be further improved.

1 is a sectional view of a display device according to a first embodiment of the present invention. FIG. 2 is an enlarged view around a display unit shown in FIG. 1. FIG. 9 is a diagram illustrating a change in the distance between the first image and the second image caused by a change in the distance between the display element and the reflection mirror. FIG. 8 is an enlarged view around a display unit according to a second embodiment. FIG. 9 is a diagram illustrating the operation of the display device according to the second embodiment.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In the description, left and right refer to left and right with reference to the occupant of the vehicle, and front and rear refer to front and rear with reference to the traveling direction of the vehicle. In the drawing, Fr indicates front, Rr indicates rear, Le indicates left from the occupant, Ri indicates right from the occupant, Up indicates up, and Dn indicates down.
<Example 1>

  Please refer to FIG. The display device 10 is mounted on, for example, the vehicle Ve, and projects light on a windshield F (screen portion F) of the vehicle Ve. The driver Mn can obtain information such as vehicle speed and navigation information from the light projected on the windshield F.

  The display device 10 includes a case 11 having a box shape, a display unit 20 provided in the case 11 for emitting light, a plane mirror 12 for reflecting the light emitted from the display unit 20, and a reflection for the plane mirror 12. A concave mirror 13 for reflecting the light toward the windshield F, and a control unit 14 for controlling the display unit 20.

  The display device 10 projects the first display light L1 and the second display light L2 on the windshield F. By projecting the first and second display lights L1 and L2, the driver Mn recognizes that two images are projected in front of the windshield F. Hereinafter, one of the two images to be recognized is referred to as a first image I1, and the other is referred to as a second image I2. More specifically, an image recognized by the driver Mn by the projection of the first display light L1 is called a first image I1, and an image recognized by the driver Mn by the projection of the second display light L2 is a second image. It is called an image I2.

  The case 11 includes a lower case 11a having an open upper part, an upper case 11b covered by the lower case 11a, and a cover 11c fitted into the upper case 11b and made of a transparent resin.

  The lower case 11a and the upper case 11b are formed of a light-shielding synthetic resin.

  Please refer to FIG. The display unit 20 includes a light source 21 that emits light, a display element 22 through which light emitted from the light source passes, and a first display light that passes through a partial area (upper area) of the display element 22. A mirror 23 that reflects L1, a half-wave plate 24 on which second display light L2 transmitted through another region (lower region) of the display element 22 is incident, and a half-wave plate 24 transmitted through the half-wave plate 24 A polarizing plate 25 through which the second display light L2 passes, a quarter-wave plate 26 through which the second display light L2 transmits through the polarizing plate 25, and a second plate 26 through which the quarter-wave plate 26 transmits And a reflection mirror 27 that reflects the display light L2 toward the polarizing plate 25.

  Please refer to FIG. The first display light L1 is light transmitted through a partial area of the display element 22, and the second display light L2 is light transmitted through another area of the display element 22. That is, the first image I1 is recognized by light transmitted through a part of the region, and the second image I2 is recognized by light transmitted through the other region. Here, the optical path of the second display light L2 is longer than the optical path of the first display light L1 between the display element 22 and the windshield F. For this reason, it is recognized that the second image I2 is projected on the far side (forward) than the first image I1.

  Please refer to FIG. The light source 21 has a structure in which an LED lamp 21b is mounted on a flat substrate 21a. The light source 21 irradiates the display element 22 with light. Note that the light source 21 may be anything as long as it can irradiate the display element 22 with light, and is not limited to the one using the LED lamp 21b.

  The display element 22 transmits light that vibrates in one direction, out of the light emitted from the light source 21. It can be said that the light transmitted through the display element 22 is linearly polarized light. Here, the display element 22 transmits light so that the first display light L1 incident on the mirror 23 becomes S-polarized light that vibrates in the horizontal direction with respect to the incident surface. Further, the display element 22 transmits the second display light L2 incident on the half-wave plate 24 so as to be S-polarized light oscillating in a direction perpendicular to the incident surface. As the display element 22, for example, a transmissive display element such as a TFT (Thin Film Transistor) liquid crystal panel is used.

  The mirror 23 is a full mirror composed of a mirror base 23a made of resin and a mirror reflector 23b deposited on the surface of the mirror base 23a.

  The mirror 23 is arranged so as to avoid the optical path of the second display light L2.

  The mirror base member 23a has a flat plate shape and is arranged at an angle of 45 degrees with respect to the display element 22.

  The mirror reflecting portion 23b is a portion formed by depositing a metal such as aluminum in a thin film shape, and reflects the incident first display light L1 upward (to the plane mirror 12 (see FIG. 1)). . The metal forming the mirror reflecting portion 23b is not limited to aluminum, and may be, for example, silver.

  The 波長 wavelength plate 24 gives a phase difference of λλ in the electric field vibration direction of the incident second display light L2 (hereinafter, the electric field vibration direction is also simply referred to as the vibration direction). That is, the half-wave plate 24 changes the vibration direction of the incident second display light L2 by 90 degrees. The half-wave plate 24 changes the vibration direction of the second display light L2 incident as S-polarized light by 90 degrees. As a result, the second display light L2 enters the polarizing plate 25 as P-polarized light.

  The polarizing plate 25 reflects or transmits the second display light L2 depending on the direction in which the incident second display light L2 vibrates. More specifically, the polarizing plate 25 transmits the second display light L2 oscillating in a predetermined direction, and reflects the second display light L2 oscillating in a direction changed by 90 degrees from the predetermined direction. That is, when a phase difference of λ / 2 is given to the light that can pass through the polarizing plate 25 in the direction of the electric field oscillation, the second display light L2 given the phase difference of λ / 2 is applied to the polarizing plate 25 by the polarizing plate 25. It will be reflected. That is, it can be said that P-polarized light is transmitted and S-polarized light is reflected. Note that the polarizing plate 25 is arranged in a state of being inclined by 135 degrees with respect to the display element 22.

  As will be described later, the polarizing plate 25 reflects the second display light L2 reflected by the reflection mirror 27 toward the plane mirror 12 (see FIG. 1).

  The 波長 wavelength plate 26 gives a 差 λ phase difference in the direction of the electric field oscillation of the incident second display light L2. That is, the incident linearly polarized light is changed to circularly polarized light, and the incident circularly polarized light is changed to linearly polarized light. The 波長 wavelength plate 26 is disposed between the polarizing plate 25 and the reflection mirror 27.

  The reflection mirror 27 is a full mirror including a reflection mirror base material 27a made of resin and a reflection mirror reflection portion 27b formed on the surface of the reflection mirror base material 27a.

  The reflection mirror base material 27a has a flat plate shape, and is arranged so that the second display light L2 is perpendicularly incident on the reflection mirror reflection portion 27b.

  The reflecting mirror 27b reflects the incident second display light L2 toward the polarizing plate 25 via the quarter-wave plate 26. The reflection mirror 27b is formed by depositing a metal such as aluminum in a thin film. The metal forming the reflecting mirror reflecting portion 27b is not limited to aluminum, and may be, for example, silver.

  The half-wave plate 24, the polarizing plate 25, the quarter-wave plate 26, and the reflection mirror 27 are respectively provided on the optical path of the second display light L2. The 波長 wavelength plate 24, the polarizing plate 25, the 波長 wavelength plate 26, and the reflection mirror 27 allow the second display light L <b> 2 transmitted through the other region of the display element 22 to transmit the second display light L <b> 2 from the back surface 25 a to the front surface 25 b , And reciprocate between the polarizing plate 25 and the reflection mirror 27 and are reflected by the polarizing plate 25. The polarizing plate 25 reflects the second display light L2 reflected by the reflection mirror 27 toward the plane mirror 12 (see FIG. 1).

  Please refer to FIG. The plane mirror 12 includes a plane mirror support 12a fixed to the upper case 11b, a plane mirror base 12b rotatably supported by the plane mirror support 12a, and a first display light formed on the surface of the plane mirror base 12b. And a plane mirror reflector 12c for reflecting the first display light L2 and the second display light L2.

  The plane mirror base 12b is made of resin and has a flat plate shape.

  The plane mirror reflector 12c reflects the first display light L1 and the second display light L2 toward the concave mirror 13. The plane mirror reflector 12c is formed by forming a metal such as aluminum into a thin film. The metal forming the plane mirror reflector 12c is not limited to aluminum, and may be, for example, silver.

  The concave mirror 13 includes a concave mirror support 13a fixed to the lower case 11a, a concave mirror base 13b rotatably supported by the concave mirror support 13a, and a first display light formed on the surface of the concave mirror base 13b. L1 and a concave mirror reflector 13c that reflects the second display light L2.

  The concave mirror base portion 13b is made of resin and has a concave shape.

  The concave mirror reflector 13c reflects the first and second display lights L1 and L2 reflected by the plane mirror reflector 12c toward the windshield F. By projecting the first and second display lights L1 and L2 via the concave mirror reflector 13c, the first and second display lights L1 and L2 are compared with the case where the first and second display lights L1 and L2 are directly projected on the windshield F. -The second images I1, I2 are enlarged. The concave mirror reflecting portion 13c is formed by evaporating a metal such as aluminum into a thin film. The metal forming the concave mirror reflecting portion 13c is not limited to aluminum, and may be, for example, silver.

  The windshield F is, for example, a windshield provided in front of the driver Mn. By projecting the first and second display lights L1 and L2 on the windshield F, the driver Mn recognizes the first and second images I1 and I2 ahead.

  The control unit 14 controls blinking of the light source 21. Further, the control unit 14 controls the voltage of the display element 22 to change the molecular arrangement of the crystal constituting the display element 22. When the display element 22 is controlled by the control unit 14, arbitrary first and second images I1 and I2 are projected on the windshield F.

  Next, the operation of the display device according to the first embodiment will be described.

  Please refer to FIG. The driver Mn transmits the first image I1 and the second image transmitted through another area of the display element 22 by projecting the first display light L1 transmitted through a partial area of the display element 22 onto the windshield F. Is projected onto the windshield F to recognize the second image I2. Thereby, information such as vehicle speed and navigation information can be obtained.

  Please refer to FIG. The display element 22 transmits light that vibrates in one direction among the light emitted from the light source 21. That is, it can be said that the first display light L1 and the second display light L2 transmitted through the display element 22 are each linearly polarized light. The control unit 14 controls the vibration direction of the light transmitted through the display element 22.

  The first display light L1 transmitted through a partial area of the display element 22 enters the mirror 23 as S-polarized light that vibrates in the horizontal direction with respect to the incident surface. The control unit 14 controls the display element 22 so that the first display light L1 enters the mirror 23 as S-polarized light. The first display light L1 incident on the mirror 23 is reflected toward the plane mirror 12 (see FIG. 1). S-polarized light has a higher light reflectance than P-polarized light that oscillates in a direction perpendicular to the plane of incidence. For this reason, loss of light energy in reflection at the mirror 23 is suppressed.

  The second display light L2 transmitted through another region of the display element 22 enters the half-wave plate 24 as S-polarized light. The 波長 wavelength plate 24 gives a phase difference of λλ to the electric field vibration direction of the incident second display light L2, and changes the vibration direction of the second display light L2 by 90 degrees. Therefore, the second display light L2 transmitted through the half-wave plate 24 enters the polarizing plate 25 from the back surface 25a as P-polarized light. Thereafter, the second display light L2 incident on the polarizing plate 25 passes through the polarizing plate 25.

  On the optical path of the second display light L2 transmitted through the polarizing plate 25, a quarter-wave plate 26 and a reflection mirror 27 are arranged in this order. The second display light L2 passes through the quarter-wave plate 26, and is then reflected by the reflection mirror 27 toward the polarizing plate 25 so as to pass through the quarter-wave plate 26 again. The second display light L2 reciprocates between the polarizing plate 25 and the reflection mirror so as to pass through the quarter-wave plate 26 twice. Accordingly, a phase difference of ４λ × 2 is given to the second display light L2, and the second display light L2 is reflected by the polarizing plate 25 toward the plane mirror 12 (see FIG. 1). Become. The second display light L2 enters the polarizing plate 25 as S-polarized light, and is reflected by the polarizing plate 25. For this reason, loss of light energy in reflection by the polarizing plate 25 is suppressed.

  Please refer to FIG. Note that the optical path of the second display light L2 is along the optical path of the first display light L1 between the mirror 23 and the windshield F.

  Please refer to FIG. FIG. 3 shows a case where the distance between the polarizing plate 25 and the reflection mirror 27 is different. Referring to FIG. The polarizing plate 25 and the reflection mirror 27 are arranged so that the distance between them is A1. Since the second display light L2 reciprocates over the distance A1, the optical path of the second display light L2 becomes longer by A1 × 2. In such a case, the distance between the first image I1 and the second image I2 recognized by the driver Mn is widened by D1.

  Referring to FIG. The polarizing plate 25 and the reflecting mirror 27 are arranged so that the distance between them is A2 (A2> A1). Since the second display light L2 reciprocates over the distance A2, the optical path of the second display light L2 becomes longer by A2 × 2. In such a case, the interval between the first image I1 and the second image I2 recognized by the driver Mn is opened by D2 (D2> D1). That is, the position of the recognized image can be changed only by changing the distance between the polarizing plate 25 and the reflection mirror 27.

  Next, effects of the display device according to the first embodiment will be described.

  Please refer to FIG. In the display device 10, a reflection mirror 27 that reflects the second display light L2 transmitted through the quarter-wave plate 26 toward the polarizing plate 25 via the quarter-wave plate 26 is arranged. Further, the polarizing plate 25 reflects light having a phase difference of λ / 2 with respect to the direction of electric field oscillation of the second display light L2 transmitted through the display element 22. By disposing the reflection mirror 27 as described above, the second display light L <b> 2 transmitted through the display element 22 is transmitted through the display element 22 and reaches the polarizing plate 25 by the same ４. The light passes through the wave plate 26 twice. That is, a phase difference of １ ／ λ × 2 is given to the electric field vibration direction. As a result, the second display light L2 reciprocates between the polarizing plate 25 and the reflection mirror 27, and is reflected by the polarizing plate 25. The optical path of the second display light L2 is longer than the optical path of the first display light L1 due to the reciprocation of the polarizing plate 25 and the reflection mirror 27. Further, such a configuration eliminates the need for a half mirror. That is, the optical path of the second display light L2 can be lengthened without using a half mirror. In the display device 10 in which the length of the optical path of the first display light L1 and the length of the optical path of the second display light L2 are different from each other, it is possible to suppress the light projected on the screen F from weakening. That is, the use efficiency of light energy can be improved.

Further, the second display light L2 reflected by the reflection mirror 27 and incident on the polarizing plate 25 is S-polarized light. S-polarized light has a higher reflectance at reflection at the interface than P-polarized light vibrating in the direction perpendicular to the incident surface. That is, by making the second display light L2 incident on the polarizing plate 25 S-polarized, it is possible to further suppress the light projected on the screen unit F from weakening. That is, the light energy use efficiency can be further improved.
<Example 2>

  Next, a second embodiment of the present invention will be described with reference to the drawings.

  Please refer to FIG. FIG. 4 is a cross-sectional view of the display device 10A according to the second embodiment, which is shown corresponding to FIG. In the display device 10A according to the second embodiment, the configuration of the display unit 20 according to the first embodiment is different. Specifically, the mirror 23 according to the first embodiment is not provided, and instead, a component (reflecting member 28A) that reflects light is provided on the optical path of the second display light L2. Other basic structures are common to the display device 10 according to the first embodiment. The same reference numerals are used for the parts common to the first embodiment, and the detailed description is omitted.

  The display unit 20A includes a light source 21 that emits light, a display element 22 that transmits light emitted from the light source, and a second display light L2 that has transmitted through another area (lower area) of the display element 22. Is incident, a polarizing plate 25 through which the second display light L2 transmitted through the half-wave plate 24 is transmitted, and a second display light L2 transmitted through the polarizing plate 25 is transmitted.波長 wavelength plate 26, a reflecting mirror 27 that reflects the second display light L 2 transmitted through the 反射 wavelength plate 26 toward the polarizing plate 25, and a second mirror reflected by the reflecting mirror 27. A reflecting member 28A to which the display light L2 is incident via the polarizing plate 25.

  The reflecting member 28A is a full mirror in which a reflecting member reflecting portion 28Ab is formed on the surface of a resin base material 28Aa.

  The reflection member 28Ab is a portion formed by depositing a metal such as aluminum in a thin film shape, and reflects the incident second display light L2 upward (the plane mirror 12 (see FIG. 1)). I do. Note that the metal forming the reflection member 28Ab is not limited to aluminum, and may be, for example, silver.

  The optical path of the second display light L2 reflected by the reflection member reflecting portion 28Ab is along the optical path of the first display light L1 until the screen portion F (see FIG. 1).

  Next, the operation of the display device according to the second embodiment will be described.

  The second display light L2 transmitted through the display element 22 is transmitted through the polarizing plate 25 and reciprocates between the polarizing plate 25 and the reflection mirror 27. Thereafter, the second display light L2 is reflected by the polarizing plate 25, enters the reflecting member 28A, and is reflected by the reflecting member 28A toward the plane mirror 12 (see FIG. 1). No half mirror is used for the display unit 20A.

  Referring to FIG. FIG. 5A illustrates the display unit 20 of the first embodiment and the optical paths of the first and second display lights L1 and L2 passing through the display unit 20. After reciprocating between the polarizing plate 25 and the reflection mirror 27, the second display light L2 is reflected by the polarizing plate 25 along the first display light L1. When the distance between the polarizing plate 25 and the reflection mirror 27 is A1, the optical path of the second display light L2 is longer than the optical path of the first display light L1 by A1 × 2.

  Referring to FIG. FIG. 5B illustrates the display unit 20A according to the second embodiment and the optical paths of the first and second display lights L1 and L2 passing through the display unit 20A. The second display light L2 is reflected by the polarizing plate 25 after reciprocating between the polarizing plate 25 and the reflection mirror 27. Thereafter, the second display light L2 reflected by the polarizing plate 25 enters the reflecting member 28A and is reflected by the reflecting member 28A. When the distance between the polarizing plate 25 and the reflecting mirror 27 is A1 and the distance between the polarizing plate 25 and the reflecting member 28A is A3, the optical path of the second display light L2 is A1 × greater than the optical path of the first display light L1. It becomes longer by 2 + A3. That is, the optical path length of the second display light L2 is longer by A3 than in the case of the first embodiment.

  Furthermore, the reflectance of the second display light L2 can be increased by causing the second display light L2 to enter the reflection member 28A as S-polarized light.

  Therefore, the display device 10A of the second embodiment configured as described above can also achieve the predetermined effects of the present invention.

  The vehicle on which the display device according to the present invention is mounted may be a two-wheeled vehicle or a three-wheeled vehicle in addition to a four-wheeled vehicle. Further, the present invention can be applied to vehicles other than vehicles, construction machines, and the like.

  In addition, the plane mirror and the concave mirror shown in the embodiments are not essential components. Therefore, these may be eliminated as necessary.

  In the embodiment, the screen portion is described as the windshield. However, the screen unit may be anything as long as it can project the first and second display lights, and is not limited to the windshield. The present invention can also be applied to a display device having a so-called combiner as a screen unit.

  That is, the present invention is not limited to the embodiments as long as the functions and effects of the present invention are exhibited.

  The display device of the present invention is suitable for being mounted on a vehicle.

DESCRIPTION OF SYMBOLS 10 ... Display apparatus 22 ... Display element 25 ... Polarizing plate 26 ... 1/4 wavelength plate 27 ... Reflection mirror F ... Windshield (screen part)
L1: first display light L2: second display light

Claims (2)

A display device that includes a display element that is irradiated with light and transmits linearly polarized light, and projects the light transmitted through the display element onto a screen unit.
When light transmitted through a partial region of the display element is defined as first display light, and light transmitted through another region of the display element is defined as second display light,
On the optical path of the second display light,
A polarizing plate through which the second display light transmitted through the display element passes;
A 波長 wavelength plate that receives the second display light transmitted through the polarizing plate and provides a を λ phase difference in the electric field oscillation direction of the incident second display light;
A reflecting mirror that reflects the second display light transmitted through the こ の wavelength plate toward the polarizing plate via the 波長 wavelength plate;
Is placed,
The display device, wherein the polarizing plate reflects light having a phase difference of λ / 2 with respect to the direction of electric field oscillation of the second display light transmitted through the display element.   The display device according to claim 1, wherein the second display light reflected by the reflection mirror and incident on the polarizing plate is S-polarized light.

Images