JP2008076483A - Screen and projector - Google Patents

Abstract

A screen capable of sufficiently reducing speckles with a simple configuration, and a projector using the screen.
A scatterer is provided along a two-dimensional direction and scatters incident light. The scatterer is different from a first position in a direction substantially perpendicular to the two-dimensional direction. The position where the incident light is scattered is changed between the second position which is the position and the first liquid crystal layer 33 which is the first scattering layer which scatters the incident light at the first position, and the incident light at the second position. And a second liquid crystal layer 37 which is a second scattering layer.
[Selection] Figure 3

Description

  The present invention relates to a screen and a projector, and more particularly to a screen technology for reducing speckles in image display by a projector.

  When an image is displayed with light modulated according to an image signal, speckles in which bright spots and dark spots are randomly distributed may occur due to light interference. Speckle gives a viewer a glimmering flickering feeling and causes an adverse effect on image viewing. Since laser light has high coherence, speckle is particularly likely to occur when a laser is used as a light source. Conventionally, techniques for reducing speckle have been proposed in, for example, Patent Document 1 and Patent Document 2.

JP-A-2005-107150 JP 2000-81602 A

  In recent years, the trend toward larger screens of projectors is remarkable. In the case of a configuration in which the screen is vibrated as in the technique proposed in Patent Document 1, a large-scale mechanism for vibrating the screen is required to be able to cope with a large screen. A large-scale mechanism is required, and considering the reliability, it is difficult to incorporate such a configuration. In the technique proposed in Patent Document 2, the screen is changed between a state in which incident light is transmitted as it is and a state in which incident light is scattered by periodically inverting the potentials of the electrodes provided above and below the liquid crystal material. . In this case, the speckle pattern when the scattering is maximized and the speckle pattern when the scattering is minimized are easily recognized in an averaged state. Therefore, the effect of making it difficult to recognize a specific speckle pattern is reduced. As described above, according to the conventional technique, there is a problem that it is difficult to sufficiently reduce speckles with a simple configuration. The present invention has been made in view of the above problems, and an object thereof is to provide a screen capable of sufficiently reducing speckles with a simple configuration, and a projector using the screen.

  In order to solve the above-described problems and achieve the object, according to the present invention, the scattering unit is provided along the two-dimensional direction and scatters incident light, and the scattering unit has a first position, It is possible to provide a screen characterized in that a position where incident light is scattered is changed between a second position that is different from the first position in a direction substantially orthogonal to the two-dimensional direction.

  “Change the position at which incident light is scattered between the first position and the second position” means that the first position and the second position are scattered in addition to the case where the incident light is scattered alternately at the first position and the second position. And a state where light is scattered at the same time and a state where light is scattered at any one of the first position and the second position. By changing the position where incident light is scattered in a direction substantially orthogonal to the scattering portion, the scattering state can be changed randomly as compared to the case where incident light is repeatedly scattered and transmitted at a specific location. . By changing the scattering state at random, the speckle can be sufficiently reduced. For example, the scattering portion may be configured to use a liquid crystal layer using an electric driving means. For this reason, speckle can be reduced without using a large-scale mechanism or a complicated configuration. Thereby, the screen which can fully reduce speckles by simple structure can be obtained.

  Moreover, as a preferable aspect of the present invention, the scattering portion includes a first scattering layer that scatters incident light at a first position, and a second scattering layer that scatters incident light at a second position, The first scattering layer desirably includes a liquid crystal layer in which liquid crystal molecules are dispersed. By using the first scattering layer and the second scattering layer, the scattering unit can change the position at which incident light is scattered between the first position and the second position.

  As a preferred embodiment of the present invention, the first scattering layer preferably includes a first liquid crystal layer in which liquid crystal molecules are dispersed, and the second scattering layer preferably includes a second liquid crystal layer in which liquid crystal molecules are dispersed. . By using the first liquid crystal layer and the second liquid crystal layer, the scattering unit can scatter incident light alternately at the first position and the second position.

  Moreover, as a preferable aspect of the present invention, it is desirable that the second scattering layer includes a scattering plate that scatters incident light. By using the liquid crystal layer and the scattering plate, the scattering portion can be alternately changed between a state where light is simultaneously scattered at the first position and the second position and a state where light is scattered at the second position.

  Moreover, as a preferable aspect of the present invention, it is desirable to include a plurality of scattering plates. As a result, speckle can be further reduced.

  In a preferred embodiment of the present invention, the first electrode and the second electrode for applying a voltage to the liquid crystal layer are provided, the first electrode has a shape having a longitudinal direction in the first direction, and the first electrode It is desirable that the second electrodes are arranged in parallel in a second direction substantially orthogonal to the direction, and the second electrode has a shape having a longitudinal direction in the second direction and is arranged in parallel in the first direction. The speckle pattern can be changed in a complicated manner by appropriately controlling the voltage application to the first electrode and the second electrode. As a result, speckle can be further reduced.

  Moreover, as a preferable aspect of the present invention, it is desirable to transmit incident light. Thereby, the speckle in the transmitted light of a screen can be reduced.

  Moreover, as a preferable aspect of the present invention, it is desirable to reflect incident light. Thereby, the speckle in the reflected light of a screen can be reduced.

  Furthermore, according to the present invention, it is possible to provide a projector having the above-described screen. By using the above screen, speckle can be sufficiently reduced with a simple configuration. Thereby, a projector capable of displaying a high-quality image with reduced speckles with a simple configuration can be obtained.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of a projector 10 according to Embodiment 1 of the present invention. The projector 10 is a rear projector that projects light on one surface of the screen 15 and observes an image by observing light emitted from the other surface of the screen 15. The optical engine unit 11 supplies light modulated according to the image signal.

  FIG. 2 shows a schematic configuration of the optical engine unit 11. The light source unit 20R for red (R) light is a semiconductor laser that supplies red laser light. The R light from the R light source unit 20 </ b> R is diverged by the diverging lens 21 and then collimated by the collimator lens 22. The light from the collimator lens 22 passes through the two integrator lenses 24 and 25. The first integrator lens 24 and the second integrator lens 25 have a plurality of lens elements arranged in an array. The first integrator lens 24 divides the light beam from the R light source unit 20R into a plurality of light beams. Each lens element of the first integrator lens 24 condenses the light beam from the R light source unit 20R in the vicinity of the lens element of the second integrator lens 25. The lens element of the second integrator lens 25 forms an image of the lens element of the first integrator lens 24 on the spatial light modulator 29R for R light.

  The light passing through the two integrator lenses 24 and 25 is converted into polarized light having a specific vibration direction by the polarization conversion element 26, for example, s-polarized light. The superimposing lens 27 superimposes the image of each lens element of the first integrator lens 24 on the R spatial light modulator 29R. The first integrator lens 24, the second integrator lens 25, and the superimposing lens 27 constitute a uniformizing unit that uniformizes the intensity distribution of the R light from the R light source unit 20R on the R light spatial light modulator 29R. To do. The field lens 28 collimates the R light from the superimposing lens 27 and enters the R light spatial light modulator 29R.

  The spatial light modulator 29R for R light is a transmissive liquid crystal display device that modulates R light according to an image signal. A liquid crystal panel (not shown) provided in the spatial light modulator 29R for R light encloses a liquid crystal layer for image display between two transparent substrates. The s-polarized light incident on the liquid crystal panel is converted into p-polarized light by modulation according to the image signal. The spatial light modulator 29R for R light emits R light converted into p-polarized light by modulation. The R light modulated by the spatial light modulator 29R for R light is incident on the cross dichroic prism 30 which is a color synthesis optical system.

  The green (G) light source unit 20G is a semiconductor laser that supplies green laser light. The G light from the G light source unit 20G passes through the optical elements from the diverging lens 21 to the field lens 28 as in the case of the R light, and then enters the G light spatial light modulator 29G. The spatial light modulation device 29G for G light is a transmissive liquid crystal display device that modulates G light according to an image signal. The s-polarized light incident on the G light spatial light modulator 29G is converted into p-polarized light by modulation in the liquid crystal panel. The spatial light modulation device 29G for G light emits G light converted into p-polarized light by modulation. The G light modulated by the spatial light modulator 29 G for G light is incident on the cross dichroic prism 30.

  The blue (B) light source unit 20B is a semiconductor laser that supplies blue laser light. The B light from the B light source unit 20B passes through the optical elements from the diverging lens 21 to the field lens 28 as in the case of the R light, and then enters the B light spatial light modulator 29B. The B light spatial light modulation device 29B is a transmissive liquid crystal display device that modulates the B light according to an image signal. The s-polarized light incident on the B light spatial light modulation device 29B is converted into p-polarized light by modulation in the liquid crystal panel. The B light spatial light modulator 29B emits B light converted into p-polarized light by modulation. The B light modulated by the B light spatial light modulator 29 </ b> B enters the cross dichroic prism 30.

  The cross dichroic prism 30 has two dichroic films 30a and 30b arranged so as to be substantially orthogonal to each other. The first dichroic film 30a reflects R light and transmits G light and B light. The second dichroic film 30b reflects B light and transmits R light and G light. The cross dichroic prism 30 combines the R light, the G light, and the B light incident from different directions and emits them in the direction of the projection lens 12.

  As the transmissive liquid crystal display device, for example, a high temperature polysilicon TFT liquid crystal panel (HTPS) can be used. The optical engine unit 11 is not limited to the case where a transmissive liquid crystal display device is used as the spatial light modulator. As the spatial light modulator, a reflective liquid crystal display (Liquid Crystal On Silicon; LCOS), DMD (Digital Micromirror Device), GLV (Grating Light Valve), or the like may be used.

  Returning to FIG. 1, the projection lens 12 projects the light from the optical engine unit 11 in the direction of the mirror 13. The mirror 13 is provided on the back surface of the housing 16. The mirror 13 bends the light from the projection lens 12 toward the screen 15 by reflection. The mirror 13 has a substantially flat planar shape. The mirror 13 can be configured by forming a reflective film on a parallel plate. As the reflective film, a highly reflective member layer, for example, a metal member layer such as aluminum, a dielectric multilayer film, or the like can be used.

  The light from the mirror 13 enters the screen 15. The screen 15 is formed on the front surface which is the surface on the viewer side of the housing 16. The screen 15 is a transmissive screen that transmits incident light that has passed through the projection lens 12 and the mirror 13. The screen 15 has an angle conversion unit (not shown) that converts light incident obliquely from the mirror 13 into the direction of the observer. A Fresnel lens can be used as the angle conversion unit.

  FIG. 3 shows a cross-sectional configuration of the main part of the screen 15. The screen 15 has a first liquid crystal layer 33 and a second liquid crystal layer 37. The first liquid crystal layer 33 and the second liquid crystal layer 37 are scattering portions that scatter incident light. The first liquid crystal layer 33 and the second liquid crystal layer 37 are both provided along the two-dimensional direction that is the screen 15 surface. The first liquid crystal layer 33 is a first scattering layer that scatters incident light at the first position. The second liquid crystal layer 37 is a second scattering layer that scatters incident light at the second position. The second position is a position different from the first position in the direction substantially perpendicular to the screen 15 surface, and is a position on the emission side from the first position.

  The first liquid crystal layer 33 is sandwiched between the first electrode 32 and the second electrode 34. The first electrode 32 and the second electrode 34 apply a voltage to the first liquid crystal layer 33. The 1st electrode 32 and the 2nd electrode 34 can be comprised by ITO and IZO which are metal oxides, for example. A power supply unit 40 is connected to the first electrode 32 and the second electrode 34. The second liquid crystal layer 37 is sandwiched between the first electrode 36 and the second electrode 38. The first electrode 36 and the second electrode 38 apply a voltage to the second liquid crystal layer 37. The 1st electrode 36 and the 2nd electrode 38 can be comprised by ITO and IZO which are metal oxides, for example. A power supply unit 41 is connected to the first electrode 36 and the second electrode 38.

  An insulating intermediate substrate 35 is provided between the second electrode 34 on the first liquid crystal layer 33 side and the first electrode 36 on the second liquid crystal layer 37 side. The intermediate substrate 35 is made of a transparent member. Each layer from the first electrode 32 on the first liquid crystal layer 33 side to the second electrode 38 on the second liquid crystal layer 37 side is sandwiched between the first substrate 31 and the second substrate 39. The first substrate 31 and the second substrate 39 are made of a transparent member. In addition, the screen 15 may be provided with a lenticular lens array, a microlens array, or the like that diffuses light.

  FIG. 4 shows a schematic cross-sectional configuration of the first liquid crystal layer 33. The first liquid crystal layer 33 disperses the liquid crystal molecules 45. The liquid crystal molecules 45 are dispersed in the first liquid crystal layer 33 in a state of being enclosed in the particles 44. The particles 44 and the medium in which the particles 44 are dispersed are sandwiched between two liquid crystal substrates 42 and 43. The liquid crystal substrates 42 and 43 are made of a transparent member. As the liquid crystal substrates 42 and 43, for example, a glass plate or a transparent film can be used.

  The alignment of the liquid crystal molecules 45 changes according to the pattern of voltage application. For example, the liquid crystal molecules 45 have a property of being oriented so as to face the direction of the electric field when a voltage is applied to the first liquid crystal layer 33. When the application of voltage to the first liquid crystal layer 33 is stopped, the liquid crystal molecules 45 are in a random alignment state as shown in FIG. The first liquid crystal layer 33 is configured such that the particles 44 and the medium have different refractive indexes when the liquid crystal molecules 45 are in a random alignment state. When the particles 44 and the medium have different refractive indexes, the light incident on the first liquid crystal layer 33 is scattered by refraction at the interface between the particles 44 and the medium. As described above, the first liquid crystal layer 33 scatters the light transmitted through the first liquid crystal layer 33 by stopping the application of the voltage.

  When a voltage is applied to the first liquid crystal layer 33, the liquid crystal molecules 45 are aligned in a direction substantially perpendicular to the first liquid crystal layer 33 as shown in FIG. In the first liquid crystal layer 33, when the alignment of the liquid crystal molecules 45 is in a uniform state, the refractive index difference between the particles 44 and the medium is smaller than when the liquid crystal molecules 45 are in a random alignment state. When the refractive index difference between the particles 44 and the medium is small, light scattering in the first liquid crystal layer 33 is suppressed. Thus, the first liquid crystal layer 33 emits light with reduced scattering by application of a voltage. The first liquid crystal layer 33 changes between a state in which light is scattered and a state in which light is hardly scattered by repeatedly stopping the application of voltage and applying the voltage. The second liquid crystal layer 37 has the same configuration as the first liquid crystal layer 33.

  6 and 7 explain the scattering of incident light in the scattering section. When the application of the voltage to the first liquid crystal layer 33 is stopped, the incident light is scattered at the first position where the first liquid crystal layer 33 is provided, as shown in FIG. At this time, when a voltage is applied to the second liquid crystal layer 37, the light from the first liquid crystal layer 33 passes through the second position where the second liquid crystal layer 37 is provided as it is.

  When a voltage is applied to the first liquid crystal layer 33, as shown in FIG. 7, the incident light passes through the first position as it is. At this time, when the application of the voltage to the second liquid crystal layer 37 is stopped, the light from the first liquid crystal layer 33 is scattered at the second position. In this manner, voltage application and voltage application stop are alternately performed on the first liquid crystal layer 33 and the second liquid crystal layer 37. By alternately applying the voltage and stopping the voltage application, the scattering unit alternately scatters the incident light in the first liquid crystal layer 33 and the second liquid crystal layer 37. In this way, the scattering unit changes the position at which incident light is scattered between the first position and the second position.

  By changing the position where incident light is scattered in a direction substantially orthogonal to the scattering portion, the scattering state can be changed randomly as compared to the case where incident light is repeatedly scattered and transmitted at a specific location. . By changing the scattering state at random, it is possible to sufficiently reduce speckle. For example, the scattering portion may be configured to use a liquid crystal layer using an electric driving means. For this reason, speckle can be reduced without using a large-scale mechanism or a complicated configuration. Thereby, there exists an effect that a speckle can fully be reduced with a simple structure.

  The first liquid crystal layer 33 and the second liquid crystal layer 37 may be configured to scatter light when a voltage is applied and suppress light scattering when the voltage application is stopped. Also in this case, the position where the incident light is scattered can be changed by alternately applying the voltage and stopping the voltage application. It is desirable that the voltage application and the voltage application stop in the first liquid crystal layer 33 and the second liquid crystal layer 37 are switched 60 times or more per second, for example. As a result, the speckle pattern is changed more quickly than a human recognizes a specific speckle pattern, and the speckle can be sufficiently reduced. The screen 15 is not limited to the configuration having the two liquid crystal layers 33 and 37, and may have a configuration having three or more liquid crystal layers. Thereby, speckles can be further reduced.

  FIG. 8 shows a cross-sectional configuration of a main part of the screen 50 according to the second embodiment of the present invention. The screen 50 can be applied to the projector 10 of the first embodiment. The same parts as those of the screen 15 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The screen 50 of this embodiment has a scattering plate 51. The scattering plate 51 and the first liquid crystal layer 33 are scattering units that scatter incident light. The first liquid crystal layer 33 is a first scattering layer that scatters incident light at the first position. The scattering plate 51 is a second scattering layer that scatters incident light at the second position. The second position is a position different from the first position in a direction substantially perpendicular to the screen 15 and is a position closer to the incident side than the first position.

  The scattering plate 51 is provided on the incident surface of the screen 50. The scattering plate 51 scatters incident light. The scattering plate 51 can be configured to disperse a scattering agent that scatters light, or to have a scattering surface with minute irregularities. A first substrate 52 is provided between the scattering plate 51 and the first electrode 32. The first substrate 52 is made of a transparent member. In addition, it is good also as a structure which provides the scattering plate 51 directly in the incident side of the 1st electrode 32, without providing the 1st board | substrate 52.

  Incident light is scattered at the second position where the scattering plate 51 is provided. When the application of voltage to the first liquid crystal layer 33 is stopped, the light from the scattering plate 51 is also scattered at the first position where the first liquid crystal layer 33 is provided. When a voltage is applied to the first liquid crystal layer 33, the light from the scattering plate 51 scattered at the second position passes through the first position where the first liquid crystal layer 33 is provided, as shown in FIG. To do. The scattering unit alternately changes between a state where incident light is scattered by the scattering plate 51 and the first liquid crystal layer 33 and a state where incident light is scattered only by the scattering plate 51. Thus, the scattering unit alternately changes between a state where incident light is scattered simultaneously at the first position and the second position and a state where incident light is scattered at the second position. In the case of this embodiment as well, speckle can be sufficiently reduced with a simple configuration. The scattering plate 51 is not limited to the configuration provided on the incident side of the first liquid crystal layer 33, and may be configured to be provided on the emission side of the first liquid crystal layer 33.

  FIG. 10 shows a cross-sectional configuration of a main part of a screen 60 according to a modification of the present embodiment. The screen 60 according to this modification has two scattering plates 51 and 61. The screen 60 is obtained by adding a scattering plate 61 to the configuration of the screen 50 (see FIG. 8). The scattering plate 61 is provided on the exit surface of the screen 60. The first liquid crystal layer 33 is provided between the two scattering plates 51 and 61.

  When a voltage is applied to the first liquid crystal layer 33, the incident light is scattered by the two scattering plates 51 and 61, respectively. When the application of the voltage to the first liquid crystal layer 33 is stopped, the incident light is scattered by the scattering plate 51, the first liquid crystal layer 33, and the scattering plate 61 as shown in FIG. By adopting a configuration having two scattering plates 51 and 61, speckle can be further reduced. The screen 60 is not limited to the configuration having the two scattering plates 51 and 61, and may have a configuration having three or more scattering plates.

  In the first and second embodiments, the first electrode and the second electrode are not limited to being provided uniformly over the entire surface of the liquid crystal layer. A plurality of first electrodes and second electrodes may be provided. For example, the first electrode 71 and the second electrode 72 shown in FIG. 12 have a strip shape. The four first electrodes 71 have a strip shape having a longitudinal direction in the first direction and are arranged in parallel in the second direction. The second direction is a direction substantially orthogonal to the first direction. The four second electrodes 72 have a strip shape having a longitudinal direction in the second direction, and are arranged in parallel in the first direction.

  By appropriately controlling the voltage application to the first electrode 71 and the second electrode 72, the scattering state for each incident position in the first liquid crystal layer 33 can be changed. By changing the scattering state at each incident position, the speckle pattern can be changed in a complicated manner. As a result, speckle can be further reduced. In addition, the 1st electrode 71 and the 2nd electrode 72 should just be arrange | positioned so that it may mutually orthogonally cross, and a number and a shape are not restricted to what is illustrated.

  FIG. 13 illustrates a screen 81 according to the third embodiment of the present invention. The screen 81 of this embodiment is a reflective screen that reflects incident light from the projector 80. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The projector 80 is a so-called front projection type projector that observes an image by observing light reflected by the screen 81. The projector 80 includes an optical engine unit 11 and a projection lens 12.

  FIG. 14 shows a cross-sectional configuration of the main part of the screen 81. The screen 81 is obtained by adding a reflecting portion 82 to the configuration of the screen 15 (see FIG. 3). The reflection part 82 is provided on the surface of the screen 81 opposite to the projector 80 side. The light sequentially transmitted through the first liquid crystal layer 33 and the second liquid crystal layer 37 is reflected by the reflection unit 82. The light reflected by the reflecting portion 82 is sequentially transmitted through the second liquid crystal layer 37 and the first liquid crystal layer 33 and then emitted from the first substrate 31.

  Also in the present embodiment, speckle can be sufficiently reduced with a simple configuration. In the first embodiment, light is transmitted through the first liquid crystal layer 33 and the second liquid crystal layer 37 once, whereas in the present embodiment, the first liquid crystal layer 33 and the second liquid crystal layer 37 have 2 Transmit light one by one. For this reason, in the case of a present Example, a speckle can be reduced efficiently.

  As described above, the screen according to the present invention is suitable for displaying an image by a projector.

1 is a diagram illustrating a schematic configuration of a projector according to a first embodiment of the invention. The figure which shows schematic structure of an optical engine part. The figure which shows the principal part cross-section structure of a screen. The figure which shows schematic sectional structure of a 1st liquid crystal layer. The figure explaining the state in which the orientation of the liquid crystal molecule was aligned. The figure explaining scattering of the incident light in a scattering part. The other figure explaining scattering of the incident light in a scattering part. The figure which shows the principal part cross-section structure of the screen which concerns on Example 2 of this invention. The figure explaining scattering of the incident light in a scattering part. FIG. 10 is a diagram illustrating a cross-sectional configuration of a main part of a screen according to a modification example of Example 2. The figure explaining scattering of the incident light in a scattering part. The figure explaining the structure which provides several 1st electrode and 2nd electrode. FIG. 6 is a diagram illustrating a screen according to a third embodiment of the present invention. The figure which shows the principal part cross-section structure of a screen.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Projector, 11 Optical engine part, 12 Projection lens, 13 Mirror, 15 Screen, 16 Case, 20R R light source part, 20G G light source part, 20B B light source part, 21 Divergence lens, 22 Collimator lens , 24 1st integrator lens, 25 2nd integrator lens, 26 Polarization conversion element, 27 Superimposing lens, 28 Field lens, 29R R light spatial light modulation device, 29G G light spatial light modulation device, 29B B light spatial light Modulator, 30 cross dichroic prism, 30a first dichroic film, 30b second dichroic film, 31 first substrate, 32 first electrode, 33 first liquid crystal layer, 34 second electrode, 35 intermediate substrate, 36 first electrode, 37 Second liquid crystal layer, 38 Second electrode, 39 Second substrate, 40, 41 Electric power Supply unit, 42, 43 Liquid crystal substrate, 44 particles, 45 Liquid crystal molecules, 50 screen, 51 Scatter plate, 52 First substrate, 60 screen, 61 Scatter plate, 71 First electrode, 72 Second electrode, 80 Projector, 81 Screen, 82 reflector

Claims (9)

It is provided along a two-dimensional direction and has a scattering part that scatters incident light,
The scattering unit changes a position at which the incident light is scattered between a first position and a second position that is different from the first position in a direction substantially orthogonal to the two-dimensional direction. A screen characterized by. The scattering unit includes a first scattering layer that scatters the incident light at the first position, and a second scattering layer that scatters the incident light at the second position;
The screen according to claim 1, wherein the first scattering layer includes a liquid crystal layer in which liquid crystal molecules are dispersed. The first scattering layer includes a first liquid crystal layer in which liquid crystal molecules are dispersed,
The screen according to claim 2, wherein the second scattering layer includes a second liquid crystal layer in which liquid crystal molecules are dispersed.   The screen according to claim 2, wherein the second scattering layer includes a scattering plate that scatters the incident light.   The screen according to claim 4, comprising a plurality of the scattering plates. A first electrode and a second electrode for applying a voltage to the liquid crystal layer;
The first electrode has a shape having a longitudinal direction in a first direction and is juxtaposed in a second direction substantially orthogonal to the first direction,
6. The screen according to claim 2, wherein the second electrode has a shape having a longitudinal direction in the second direction and is arranged in parallel in the first direction.   The screen according to claim 1, wherein the incident light is transmitted.   The screen according to claim 1, wherein the incident light is reflected.   A projector comprising the screen according to claim 7.

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