JP2000235181A - Display device, electronic instrument utilizing the same and integrated optical film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semi-transparent reflective display device which can differentiate display colors in a reflective display with external light from display colors in a transmissive display with illumination of a light source in a display device utilizing an optical device with variable transmission axis of polarization. SOLUTION: The display device utilizes a TN liquid crystal 140 as a means for varying the transmission axis of polarization and is provided with a polarizing plate 130 on the upper side of the TN liquid crystal 140 and a polarizing plate 135, an oriented optical retardation film 150 as an optically anisotropic body and a polarized light separator 160 on the lower side of the liquid crystal in this order. Furthermore, a light source 190 is provided which can emit light from the lower side of the polarized light separator 160 thereunder. In a region 120 where no voltage is applied, incident light is converted into beams of elliptically polarized light respectively different corresponding to wavelengths by the oriented optical retardation film 150, light corresponding to a wavelength region -Δλ1 is reflected by the polarized light separator 160 which is a reflection polarizer and a color display is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display device, and more particularly to a transflective liquid crystal display device.

[0002]

2. Description of the Related Art In a conventional transflective liquid crystal display device using a transmission polarization axis changing means for rotating a polarization axis such as a conventional TN (Twisted Nematic) liquid crystal or STN (Super-Twisted Nematic) liquid crystal, the display background. There are various ways to make a color. For example, there are a method using a color filter, a method using a color polarizing plate, a method using birefringence of liquid crystal, and the like.

[0003]

However, in any case, the display background color cannot be changed when the backlight is turned on or off. Therefore, in order to enhance the design in mobile devices, especially mobile phones, various backlight colors are used instead of white.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device using a transmission polarization axis changing means, in which a display background color at the time of reflection display by external light and a display background color at the time of transmission display by lighting of a light source are used instead of coloring with a backlight. It is another object of the present invention to provide a display device capable of differentiating the above. Another object of the present invention is to provide an electronic device using the same. Another object is to provide an integrated optical film that can be used for this display device.

[0005]

The principle will be described with reference to FIGS. 1, 2 and 3. FIG. FIG. 1 is a schematic perspective view of a polarization separator, FIG. 2 is a diagram for explaining a case where external light is incident on a display device using the polarization separator, and FIG. 3 is a case where a light source is turned on. It is a figure for explaining.

[0006] The polarization separator 160 has two different layers 1
It has a structure in which (A layer) and 2 (B layer) are alternately laminated in a plurality of layers. The refractive index (nAX) in the X direction of the A layer 1 is different from the refractive index (nAY) in the Y direction. The refractive index (nBX) in the X direction and the refractive index (nBY) in the Y direction of the B layer 2 are equal. Also,
The refractive index (nAY) of the A layer 1 in the Y direction is equal to the refractive index (nBY) of the B layer 2 in the Y direction.

Therefore, of the light incident on the polarization separator 160 from a direction perpendicular to the upper surface 5 of the polarization separator 160, Y
The linearly polarized light of the direction
Out of the device as linearly polarized light in the Y direction. Conversely, among the light incident on the polarization separator 160 from a direction perpendicular to the lower surface 6 of the polarization separator 160, the linearly polarized light in the Y direction is transmitted through the polarization separator 160 and is linearly polarized in the Y direction from the upper surface 5. Out. Here, the transmission direction Y is referred to as a transmission axis.

On the other hand, the thickness of the A layer 1 in the Z direction is t
Assuming that the thickness of the A and B layers 2 in the Z direction is tB and the wavelength of the incident light is λ,

[0009]

By setting tA · nAX + tB · nBX = λ / 2 (1), the light of wavelength λ and the direction perpendicular to the upper surface 5 of the polarization separator 160 can be obtained.
The linearly polarized light in the X direction out of the light incident on 60 is reflected by this polarization separator 160 as linearly polarized light in the X direction. Further, the light having the wavelength λ and the polarization splitter 16
The linearly polarized light on the lower surface 6 of 0 is reflected by the polarization separator 160 as linearly polarized light in the X direction. Here, the direction of reflection X is referred to as a reflection axis.

Then, the thickness tA of the A layer 1 in the Z direction
By varying the thickness tB of the B layer 2 in the Z direction so that the above (1) is satisfied over the entire wavelength range of visible light, a straight line in the X direction can be obtained not only for a single color but also for all white light. A polarized light separator that reflects the polarized light as linearly polarized light in the X direction and transmits the linearly polarized light in the Y direction as linearly polarized light in the Y direction is obtained.

[0011] Such a polarization separator is disclosed as a reflective polarizer in WO 95/17692.

FIG. 2 is a diagram for explaining a case where external light is incident on a display device using the polarization separator 160. In this display device, a TN liquid crystal 140 is used as a transmission polarization axis changing unit. A polarizing plate 130 is provided above the TN liquid crystal 140. TN element 14
Below 0, a polarizing plate 135, a stretched retardation film 150 as an optically anisotropic body, and a polarization separator 160 are provided in this order. A light source 1 capable of emitting light from below the polarization separator 160 is provided below the polarization separator 160.
90 are provided.

The angle between the transmission axis direction of the polarizing plate 135 and the optical axis direction of the stretched retardation film 150 and the angle between the transmission axis direction of the polarization separator 160 and the optical axis direction of the stretched phase difference film 150 are about 45 degrees.

Referring to FIG. 2, the left side of this display device under external light is a voltage application unit 110, and the right side is a voltage non-application unit 12
Description will be made assuming 0.

In the voltage application section 120 on the right side, the natural light 121 is converted into linearly polarized light in a direction parallel to the plane of the drawing by the polarizing plate 130, and then the polarization direction is twisted by 90 ° by the TN liquid crystal 140, and the direction perpendicular to the plane of the drawing is changed. , Which passes through the polarizing plate 135 and is stretched by the retardation film 150.
Accordingly, light passing through the polarization separator 160 is light in a certain wavelength region Δλ1. On the other hand, light in the wavelength region −Δλ1 other than the wavelength region Δλ1 is reflected by the polarization separator 160. Polarization separator 16
The light in the wavelength region −Δλ1 reflected by 0 passes through the stretched retardation film 150 and the polarizing plate 135 again as linearly polarized light in a direction perpendicular to the plane of the paper, and the polarization direction is twisted by 90 ° by the TN liquid crystal 140 to form a plane on the paper. It becomes linearly polarized light in a parallel direction, and is emitted from the polarizing plate 130 as linearly polarized light in a direction parallel to the paper surface. As described above, when no voltage is applied, the incident light is converted into elliptically polarized light having different wavelengths by the stretched retardation film 150, and light in a certain wavelength region -Δλ1 is reflected by the polarization separator 160, and a color display is obtained. .

In the voltage application section 110 on the left side, the natural light 111 is converted into linearly polarized light in a direction parallel to the plane of the drawing by the polarizing plate 130, and then transmitted through the TN liquid crystal 140 without changing the polarizing direction, and absorbed by the polarizing plate 135. It becomes dark.

As described above, in the voltage non-applying section 120, elliptically polarized light having different wavelengths is formed by the stretched phase difference film 150, light of a certain wavelength region −Δλ 1 is reflected by the polarization separator 160, and output light of −Δλ 1 is reflected. 122, a color display is obtained, and in the voltage application unit 110, the light is absorbed by the polarizing plate 135 and becomes dark.

Next, referring to FIG. 3, the display device comprises:
It is the same as FIG.

When the light source 190 is turned on, in the voltage non-applying unit 120 on the right side, of the light 125 of the light source, the linearly polarized light in the direction perpendicular to the paper surface passes through the polarization separator 160. The linearly polarized light in the direction perpendicular to the paper surface that has passed through the polarization separator 160 is converted into elliptically polarized light having different wavelengths by the stretched retardation film 150, so that light passing through the polarizing plate 135 is light in a certain wavelength region Δλ2. The light that has passed through the polarizing plate 135 is twisted by 90 ° by the TN liquid crystal 140 and becomes linearly polarized light in a direction parallel to the paper surface.
Pass 30. That is, the incident light becomes elliptically polarized light having different wavelengths by the stretched retardation film 150,
Light in a certain wavelength region Δλ2 is transmitted by the polarizing plate 130, and a color display is obtained.

In the left-side voltage application unit 110, of the light 115 of the light source, the linearly polarized light in the direction perpendicular to the paper surface passes through the polarization separator 160. The linearly polarized light in the direction perpendicular to the paper surface that has passed through the polarization separator 160 is
Since the elliptically polarized light has different wavelengths depending on 50, light passing through the polarizing plate 135 is light in a certain wavelength region Δλ2. The light that has passed through the polarizing plate 135 becomes linearly polarized light in a direction perpendicular to the paper surface without being changed in polarization direction by the TN liquid crystal 140, and is absorbed by the polarizing plate 130 and becomes dark.

As described above, in the voltage non-applying section 120, elliptically polarized light having different wavelengths is obtained by the stretched retardation film 150, and a certain wavelength region Δ is generated by the polarizing plate 130.
The light of λ2 is transmitted, and a color display is obtained. In the voltage application unit 110, the light is absorbed by the polarizing plate 130 and darkened. Therefore, when the light source color is white while the light source 190 is on, a black display is obtained on the color background in the wavelength region Δλ2.

As described above, in the case of external light, the wavelength region-Δ
A black display is obtained on the background of λ1, and a black display is obtained on the background of the wavelength region Δλ2 when the light source is turned on. Here, since the wavelength region −Δλ1 and the wavelength region Δλ2 are different, the display background color at the time of reflection display by external light and the display background color at the time of transmissive display by light source lighting can be made different.

Although the normally white mode has been described above, a normally black mode may be used. In the case of normally black, the color of the lighting portion can be made different between reflection display by external light and transmission display by light source lighting.

In the above description, the TN liquid crystal 140 has been described as an example.
LCD and ECB (Electrically Controlled Birefringenc)
e) The basic operation principle is the same even if other transmission polarization axes such as liquid crystal can be changed by voltage or the like.

The present invention is based on the above principle. According to the first aspect of the present invention, there is provided a transmission polarization axis changing means capable of changing a transmission polarization axis, and the transmission polarization axis changing means interposing the transmission polarization axis changing means therebetween. First and second polarized light separating means disposed on both sides of the axis varying means, and third polarized light separating means disposed on the opposite side of the transmission polarized light axis varying means with respect to the second polarized light separating means. A display device comprising: an optically anisotropic member disposed between the second polarized light separating means and the third polarized light separating means, wherein the first polarized light separating means comprises the transmitted polarized light. A linearly polarized light component in a first predetermined direction of the light incident from the axis variable means side is transmitted to a side opposite to the transmission polarization axis variable means, and a second predetermined direction substantially orthogonal to the first predetermined direction is transmitted. In the direction opposite to the transmission polarization axis varying means. A polarization separating unit that can emit linear polarized light in the first predetermined direction to the transmission polarization axis variable unit side with respect to light incident from the side opposite to the transmission polarization axis variable unit without emitting the light. The second polarization splitting means includes:
A linearly polarized light component in a third predetermined direction out of the light incident from the transmission polarization axis changing unit is transmitted to the opposite side to the transmission polarization axis changing unit, and a fourth light beam substantially orthogonal to the third predetermined direction is transmitted. Can absorb linearly polarized light components in a predetermined direction, and can emit linearly polarized light in the third predetermined direction to the transmission polarization axis variable means side with respect to light incident from the side opposite to the transmission polarization axis variable means. A polarization separating unit, wherein the third polarization separating unit transmits a linearly polarized light component in a fifth predetermined direction in the light incident from the optically anisotropic body side, and is substantially orthogonal to the fifth predetermined direction. A display device characterized in that the display device is a polarization separation unit that can reflect the linearly polarized light component in the sixth predetermined direction to the optically anisotropic body side.

In this display device, elliptically polarized light having different wavelengths is produced by the optical anisotropic body, and light of a certain wavelength is reflected by the third polarization separation means, so that a color display is obtained.

According to the second aspect of the present invention, in the display device, light can be incident on the side of the transmission polarization axis changing unit from the side opposite to the optically anisotropic body with respect to the third polarization separation unit. The display device according to claim 1, further comprising a light source.

With this configuration, under external light, the optically anisotropic body makes elliptically polarized light having different wavelengths, and light of a certain wavelength is reflected by the third polarization separation means, thereby obtaining a color display. Rara. Further, when the light source is turned on, elliptically polarized light having different wavelengths is generated by the optical anisotropic body, and light of a certain wavelength different from the certain wavelength is transmitted by the second polarization separating means, so that a color display is obtained.

As described above, the display color at the time of reflection display by external light and the display color at the time of transmission display by light source lighting can be made different.

According to the third aspect, the third polarization separating means transmits the linearly polarized light component in the fifth predetermined direction in the light incident from the optically anisotropic body side, and The linearly polarized light component in the sixth predetermined direction substantially orthogonal to the predetermined direction is reflected on the optically anisotropic body side, and the fifth predetermined on the optically anisotropic body side with respect to light incident from the light source. The display device according to claim 1, wherein the display device is a polarization separation unit that emits linearly polarized light in a direction and reflects the linearly polarized light in the sixth predetermined direction.

According to a fourth aspect, the third polarization separating means is a laminate in which a plurality of layers are stacked in close contact with each other, and the refractive indices of the plurality of layers are adjacent to each other. 4. The laminate according to claim 3, wherein the layers are equal in a seventh predetermined direction and different in an eighth predetermined direction orthogonal to the seventh predetermined direction between the layers. 5. A display device is provided.

In the third polarized light separating means having such a configuration, the linearly polarized light component in the seventh direction in the light incident on one main surface of the third polarized light separating means from the laminating direction. Is transmitted as the light of the linearly polarized light component in the seventh direction to the other main surface side on the opposite side, and the light of the linearly polarized light component in the eighth direction orthogonal to the seventh direction is the light of the eighth direction. The light of the linearly polarized light component in the seventh direction is reflected as the light of the linearly polarized light component, and the light of the linearly polarized light component in the seventh direction is incident on the other main surface of the third polarization separation means from the laminating direction. The light of the linearly polarized light component of the eighth linearly polarized light component is transmitted as light of the linearly polarized light component of the seventh direction to the one main surface side on the opposite side, and the linearly polarized light component of the eighth direction orthogonal to the seventh direction. Reflected as light.

According to a fifth aspect of the present invention, there is provided the display device according to any one of the first to fourth aspects, wherein the optical axis direction of the optically anisotropic body is constant in a plane. Is done.

In this way, the display colors become uniform in the plane, making it easier to see.

According to the sixth aspect, the direction of the optical axis of the optically anisotropic body is the third predetermined direction and the fifth direction.
The display device according to claim 5, wherein the display device is not parallel or perpendicular to each of the predetermined directions.

According to the seventh aspect, the angle θ1 between the optical axis direction of the optically anisotropic body and the third predetermined direction and the optical axis direction of the optically anisotropic body and the fifth The angle θ2 formed by a predetermined direction, the angle θ1 and the angle θ
7. The display device according to claim 6, wherein each of the two is 30 to 60 degrees. 8.

In this manner, a vivid display color can be obtained.

According to the eighth aspect, the display device according to any one of the first to fourth aspects is provided, wherein the optically anisotropic body is a second transmission polarization axis changing unit. You.

In this case, the display color can be changed by changing the transmission polarization axis by the second transmission polarization axis changing means.

According to a ninth aspect of the present invention, there is provided the display device according to the eighth aspect, wherein the second transmission polarization axis varying means includes a liquid crystal.

According to a tenth aspect, there is provided the display device according to any one of the first to ninth aspects, wherein the transmission polarization axis varying means includes a liquid crystal. .

According to claim 11, the second polarization splitting means, the optically anisotropic member, and the third
Wherein the polarized light separating means is bonded with an adhesive or the like.

By doing so, the integrated optical film can be adhered to the transmission polarization axis changing means at one time at the time of manufacturing the display device, and the second polarization separation means and the optical anisotropic body can be bonded together. The manufacturing is easier than in the case where the third polarized light separating means is sequentially bonded.

According to a twelfth aspect of the present invention, there is provided an electronic apparatus incorporating the display device according to any one of the first to eleventh aspects.

[0045]

Next, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 4 is an exploded sectional view for explaining a display device according to a first embodiment of the present invention.

In the display device 10 of the present embodiment,
The STN cell 20 is used as the transmission polarization axis changing means. Above the STN cell 20, a retardation film 14 and a polarizing plate 12 are provided in this order. STN cell 2
Below 0, a polarizing plate 15, a retardation film 80, a diffusion plate 30, and a polarization separator 40 are provided in this order.
The angle between the direction of the transmission axis of the polarizing plate 15 and the direction of the optical axis of the phase difference film 80 is θ1, the angle between the direction of the transmission axis of the polarization separator 40 and the direction of the optical axis of the phase difference film 80 is θ2, The angle θ1 and the angle θ2 are 45 degrees. Also,
The direction of the transmission axis of the polarizing plate 15 and the direction of the transmission axis of the polarization separator 40 are made parallel.

Further, a light source 70 to which light can enter from below the polarization separator 40 is provided. Light source 70
Uses an LED (Light Emitting Diode) 71 and emits light upward through a light guide 72.

In the STN cell 20, an STN liquid crystal 26 is sealed in a cell constituted by two glass substrates 21, 22 and a sealing member 23. On the lower surface of the glass substrate 21, a transparent electrode 24 is provided.
A transparent electrode 25 is provided on the upper surface of the second electrode 2. As the transparent electrodes 24 and 25, ITO (Indium Tin Oxide), tin oxide, or the like can be used. The retardation film 14 is
Used as an optical anisotropic body for color compensation, STN cell 2
It is used to correct coloring that occurs at 0. In addition, as the polarization separator 40 in the present embodiment, FIG.
Is used.

Next, the operation of the display device 10 according to the present embodiment will be described.

Under the external light, in the region where no voltage is applied, natural light is converted into linearly polarized light in a predetermined direction by the polarizing plate 12, and then converted into linearly polarized light whose polarization direction is twisted by a predetermined angle by the STN cell 20. The light passes through the plate 15 and is converted into elliptically polarized light having different wavelengths by the retardation film 80, and light in a certain wavelength region Δλr is reflected by the polarization separator 40, thereby obtaining a color display. Since the diffusion plate 30 is provided, the directivity of the reflected light from the polarization separator 40 is reduced.

In the voltage application region, natural light is converted into linearly polarized light in a predetermined direction by the polarizing plate 12, and thereafter,
The light passes through the STN cell 20 as linearly polarized light, is absorbed by the polarizing plate 15, and becomes dark.

Next, while the light source 70 is turned on, in the no-voltage application region, the light emitted from the light source 70
Is converted into linearly polarized light, elliptically polarized light having different wavelengths by the retardation film 80, light in a certain wavelength region Δλt is transmitted by the polarizing plate 15, linearly polarized light in a predetermined direction by the STN cell 20, and absorbed by the polarizing plate 12. It is emitted without.

In the voltage application region, the light emitted from the light source 70 becomes linearly polarized light by the polarization separator 40, becomes elliptically polarized light having different wavelengths by the retardation film 80, and the light in a certain wavelength region Δλt is transmitted by the polarizing plate 15. Then, the light is converted into linearly polarized light in a predetermined direction by the STN cell 20 and absorbed by the polarizing plate 12. That is, it becomes dark.

As described above, in the case of external light, elliptically polarized light having different wavelengths is obtained by the retardation film 80, and light in a certain wavelength region Δλr is reflected by the polarization separator 40, so that a color display is obtained. Further, under a light source lamp, elliptically polarized light having different wavelengths is produced by the retardation film 80, and the polarizing plate 1
5, light in a certain wavelength region Δλt is transmitted, and a color display is obtained. Here, since the certain wavelength region λr is different from the certain wavelength region λt, the display background color at the time of reflection display by external light and the display background color at the time of transmission display by light source lighting can be made different.

(Second Embodiment) In the first embodiment, when a uniaxially stretched film is used as the retardation film 80 and the retardation values thereof are variously changed, the display background at the time of reflection display by external light is displayed. The color and the display background color during the transmissive display by lighting the light source were examined. The results are shown in Table 1. The light source 70 used a white LED.

[0057]

[Table 1]

As can be seen from this table, the display color at the time of reflection display by external light and the display color at the time of transmission display by light source lighting can be made different.

(Third Embodiment) In the first embodiment, the direction of the transmission axis of the polarizing plate 15 and the direction of the transmission axis of the polarization separator 40 are changed from parallel to orthogonal. When the retardation value of the retardation film 80 was variously changed, the display background color at the time of reflection display by external light and the display background color at the time of transmission display by light source lighting were examined. The result exhibited a color close to the complementary color of the display background color of the result of the second embodiment.

(Fourth Embodiment) In the first embodiment, the angle θ1 and the angle θ2 are each changed from 0 to 90 degrees. When the angle θ1 and the angle θ2 are in the range of 30 to 60 degrees, a display background color with good color purity can be obtained.
When the angle θ2 formed with 1 was about 45 degrees, the color purity was highest.

(Fifth Embodiment) FIG. 5 is a schematic diagram for explaining a liquid crystal display device according to a fifth embodiment of the present invention. That is, the diffusion plate 30 is removed in the first embodiment. As a result, the display background color becomes a mirror-like reflection with high directivity.

(Sixth Embodiment) FIG. 6 is a schematic diagram for explaining a liquid crystal display device according to a sixth embodiment of the present invention. That is, in the first embodiment, the homogeneous alignment liquid crystal cell 9 is used instead of the retardation film 80.
0 was used.

In the homogeneously oriented liquid crystal cell 90, a homogeneously oriented liquid crystal 96 is sealed in a cell constituted by two glass substrates 91 and 92 and a sealing member 93. A transparent electrode 9 is provided on the lower surface of the glass substrate 91.
4 and a transparent electrode 95 is provided on the upper surface of the glass substrate 92.
Is provided. As the transparent electrodes 94 and 95, IT
O (Indium Tin Oxide), tin oxide, or the like can be used. The optical anisotropy Δn of the homogeneously-aligned liquid crystal 96 is about 0.1.
At 15, the thickness of the liquid crystal layer is 10 μm.

Therefore, a voltage was applied to the transparent electrodes 94 and 95 to change the alignment state of the homogeneously aligned liquid crystal 96.

As a result, it was possible to change both the display background color during reflection display by external light and the display background color during transmission display by turning on the light source.

(Seventh Embodiment) The display device according to the first embodiment of the present invention is mounted on an information terminal. The display background color at the time of reflection display by external light and the display background color at the time of transmission display by light source lighting can be made different from each other, and a unique display that has never been seen before can be obtained.

Similar results were obtained with information terminals equipped with the display devices according to the second to sixth embodiments of the present invention.

Although the information terminal is exemplified in the embodiment of the present invention, the display device of the present invention can be used for various electronic devices such as a mobile phone, a home appliance, an electronic organizer, and a calculator.

[0069]

According to the present invention, the elliptically polarized light having different wavelengths due to the optically anisotropic body under the external light,
The light of a certain wavelength is reflected by the polarized light separating means, and a color display is obtained. In addition, if a light source is provided, the elliptically polarized light having different wavelengths is generated by the stretched retardation film while the light source is turned on, and light of a certain wavelength different from the certain wavelength is transmitted by the second polarization separating means, and a color display is obtained. Can be That is, the display color at the time of reflection display by external light and the display color at the time of transmission display by light source lighting can be made different. As a result, a unique display that has never been seen before can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a polarization separator used for a display device of the present invention.

FIG. 2 is a diagram for explaining the principle of reflection of the display device of the present invention.

FIG. 3 is a diagram for explaining the principle of transmission of the display device of the present invention.

FIG. 4 is an exploded cross-sectional view for explaining the display device according to the first embodiment of the present invention.

FIG. 5 is an exploded cross-sectional view illustrating a display device according to a fifth embodiment of the present invention.

FIG. 6 is an exploded sectional view illustrating a display device according to a sixth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 display device 12, 15, 130, 135 polarizing plate 14, 80 retardation film 20 STN cell 21, 22 glass substrate 26 STN liquid crystal 30 diffusion plate 40, 160 polarization separator 70, 190 Light source 90: homogeneously aligned liquid crystal cell 91, 92: glass substrate 96: homogeneously aligned liquid crystal 110: voltage applying unit 120: no voltage applying unit 111, 121: natural light 122: emitted light 115, 125: light source light 140: TN liquid crystal 150 ... Stretched retardation film

Claims (12)

[Claims] 1. A transmission polarization axis changing means capable of changing a transmission polarization axis, and first and second polarization separation means arranged on both sides of the transmission polarization axis changing means with the transmission polarization axis changing means interposed therebetween. A third polarized light separating means disposed on the opposite side of the transmission polarized light axis varying means with respect to the second polarized light separating means; and a second polarized light separating means and the third polarized light separating means. A display device comprising: an optically anisotropic member disposed therebetween; wherein the first polarization splitting means includes a linearly polarized light in a first predetermined direction among light incident from the transmission polarization axis changing means side. And transmitting a linearly polarized light component in a second predetermined direction substantially orthogonal to the first predetermined direction to a side opposite to the transmission polarization axis changing means. Without being incident from the opposite side of the transmission polarization axis changing means. Wherein the variable transmission polarization axis means side with respect to the light first
Wherein the second polarization separation means converts a linear polarization component in a third predetermined direction of the light incident from the transmission polarization axis variable means side. Transmitted to the side opposite to the transmission polarization axis variable means, absorbs a linearly polarized component in a fourth predetermined direction substantially orthogonal to the third predetermined direction, and is incident from the side opposite to the transmission polarization axis variable means. A polarization separating unit that emits linearly polarized light in the third predetermined direction toward the transmission polarization axis changing unit with respect to light, wherein the third polarization separating unit receives light incident from the optically anisotropic body side A polarization separating unit that transmits a linearly polarized light component in a fifth predetermined direction and reflects a linearly polarized light component in a sixth predetermined direction substantially orthogonal to the fifth predetermined direction toward the optically anisotropic body A display device, characterized in that: 2. The display device according to claim 1, further comprising: a light source capable of making light incident on the transmission polarization axis changing unit from a side opposite to the optically anisotropic body with respect to the third polarization separation unit. The display device according to claim 1, wherein: 3. The third polarized light separating means transmits a linearly polarized light component in the fifth predetermined direction in light incident from the optically anisotropic body side, and is substantially orthogonal to the fifth predetermined direction. Reflecting the linearly polarized light component in the sixth predetermined direction to the optically anisotropic body side, and emitting linearly polarized light in the fifth predetermined direction to the optically anisotropic body side with respect to light incident from the light source. And a polarization separating means which can reflect linearly polarized light in the sixth predetermined direction.
The display device according to any one of the above. 4. The third polarized light separating means is a laminate in which a plurality of layers are laminated in close contact with each other, and the plurality of layers have a refractive index of 7 between adjacent layers. 4. The display device according to claim 3, wherein the stacked bodies are equal in a predetermined direction, and are different in an eighth predetermined direction orthogonal to the seventh predetermined direction. 5. 5. The display device according to claim 1, wherein the optical axis direction of the optically anisotropic body is constant in a plane. 6. The optical axis direction of the optical anisotropic body is not parallel or perpendicular to the third predetermined direction and the fifth predetermined direction, respectively. Display device. 7. An angle θ1 between the optical axis direction of the optically anisotropic body and the third predetermined direction and an angle θ2 between the optical axis direction of the optically anisotropic body and the fifth predetermined direction. And each of the angle θ1 and the angle θ2 is 30 to 60.
The display device according to claim 6, wherein the display unit is a degree. 8. The display device according to claim 1, wherein the optically anisotropic member is a second transmission polarization axis changing unit that changes a transmission polarization axis. 9. The display device according to claim 8, wherein the second transmission polarization axis changing unit includes a liquid crystal. 10. The display device according to claim 1, wherein the transmission polarization axis changing unit includes a liquid crystal. 11. The integrated optics according to claim 1, wherein said second polarized light separating means, said optically anisotropic body, and said third polarized light separating means are adhered with an adhesive or the like. the film. 12. An electronic apparatus incorporating the display device according to claim 1. Description: