JP2022123995A - Display and projector - Google Patents

Abstract

To provide a display that is excellent in reliability of a liquid crystal panel.SOLUTION: A display of the present invention comprises: a light source device that emits light including first light in a first wavelength range, second light in a second wavelength range, and third light in a third wavelength range; a switching unit; and an optical modulator. The optical modulator has a liquid crystal panel having a plurality of pixels, and the pixels each have at least a first sub-pixel, a second sub-pixel, and a third sub-pixel. The switching unit temporally switches between a first period in which the first light is incident on the first sub-pixels, the second light or the third light is incident on the second sub-pixels, and the second light or the third light is incident on the third sub-pixels, a second period in which the first light is incident on the second sub-pixels, the second light or the third light is incident on the third sub-pixels, and the second light or the third light is incident on the first sub-pixels, and a third period in which the first light is incident on the third sub-pixels, the second light or the third light is incident on the first sub-pixels, and the second light or the third light is incident on the second sub-pixels.SELECTED DRAWING: Figure 1A

Description

The present invention relates to display devices and projectors.

A projector is known that modulates light emitted from a light source to generate image light based on image information, and projects the generated image light. Patent Document 1 below discloses a projector that includes a light source device, a light modulation device including a single liquid crystal panel, and a projection optical device. In this projector, blue light, red light, and two green lights whose polarization directions are aligned with each other are emitted from the light source device, and are spatially separated by a microlens array provided on the incident side of the liquid crystal panel. , respectively enter a blue sub-pixel, a red sub-pixel, and two green sub-pixels of the liquid crystal panel.

Japanese Patent Application Laid-Open No. 2020-160236

As described above, a projector equipped with a single liquid crystal panel, a so-called single-panel projector, is more efficient than a projector equipped with three liquid crystal panels that modulate red light, green light, and blue light, respectively. The energy density of the light with which each pixel of the liquid crystal panel is irradiated increases. In particular, blue light is more likely to damage sub-pixels irradiated with blue light than red light and green light. As a result, the blue sub-pixels of the liquid crystal panel may be damaged and the reliability of the liquid crystal panel may be lowered.

In order to solve the above problems, a display device according to one aspect of the present invention includes first light in a first wavelength band, second light in a second wavelength band different from the first wavelength band, and a light source device that emits light containing one wavelength band and a third light in a third wavelength band different from the second wavelength band; a switching unit into which the light emitted from the light source device is incident; a light modulating device that modulates light emitted from the light according to image information. The light modulating device has a liquid crystal panel having a plurality of pixels, each of the plurality of pixels having at least a first sub-pixel, a second sub-pixel and a third sub-pixel. The switching section allows the first light to be incident on the first sub-pixel, the second light or the third light to be incident on the second sub-pixel, and the second light or the third light to be the third light. a first period in which the light is incident on three sub-pixels; the first light is incident on the second sub-pixel; the second light or the third light is incident on the third sub-pixel; a second period in which the third light is incident on the first sub-pixel, the first light is incident on the third sub-pixel, and the second light or the third light is incident on the first sub-pixel; A third period in which the second light or the third light is incident on the second sub-pixel is temporally switched.

A display device according to another aspect of the present invention comprises: first light in a first wavelength band; second light in a second wavelength band different from the first wavelength band; a light source device emitting light including a third light in a third wavelength band different from the wavelength band; a switching section into which the light emitted from the light source device is incident; and an optical modulator that modulates according to the information. The light modulation device has a liquid crystal panel having a plurality of pixels, each of the plurality of pixels having at least a first sub-pixel and a second sub-pixel. The switching section includes a first period during which the first light is incident on the first sub-pixel and the second light is incident on the second sub-pixel, and a period during which the first light is incident on the second sub-pixel. , and a second period in which the second light is incident on the first sub-pixel. On the light exit surface of the switching portion, the emission position of the first light and the emission position of the second light are temporally switched about the central axis of the third light.

A projector according to one aspect of the present invention comprises a display device according to one aspect of the present invention or a display device according to another aspect of the present invention, a projection optical device for projecting light emitted from the display device, Prepare.

1 is a schematic configuration diagram of a projector according to a first embodiment; FIG. FIG. 4 is a schematic diagram of the arrangement of four colored lights emitted from the light source device as viewed from the +Z direction; 3 is an enlarged view of an optical modulator; FIG. FIG. 5 is a schematic diagram showing the rotational position of the prism in the first period; FIG. 4 is a schematic diagram showing the positional relationship of four colored lights when emitted from a prism in the first period; FIG. 10 is a schematic diagram showing the rotational position of the prism in the second period; FIG. 11 is a schematic diagram showing the positional relationship of four colored lights when emitted from the prism in the second period; FIG. 10 is a schematic diagram showing the rotational position of the prism in the third period; FIG. 11 is a schematic diagram showing the positional relationship of four colored lights when emitted from the prism in the third period; FIG. 11 is a schematic diagram showing the rotational position of the prism in the fourth period; FIG. 11 is a schematic diagram showing the positional relationship of four colored lights when emitted from a prism in a fourth period; 6 is a schematic configuration diagram of a projector according to a second embodiment; FIG. FIG. 4 is a schematic diagram showing rotational positions of a plurality of mirrors in a first period; FIG. 10 is a schematic diagram showing the positional relationship of four colored lights when they are emitted from the mirror in the first period; FIG. 11 is a schematic diagram showing rotational positions of a plurality of mirrors in a second period; FIG. 10 is a schematic diagram showing the positional relationship of four colored lights when they are emitted from the mirror in the second period; FIG. 11 is a schematic diagram showing rotational positions of a plurality of mirrors in a third period; FIG. 11 is a schematic diagram showing the positional relationship of four colored lights when they are emitted from the mirror in the third period; FIG. 11 is a schematic diagram showing rotational positions of a plurality of mirrors in a fourth period; FIG. 11 is a schematic diagram showing the positional relationship of four colored lights when they are emitted from the mirror in the fourth period; FIG. 12 is a schematic diagram showing the rotational position of the prism in the first period in the projector of the third embodiment; FIG. 4 is a schematic diagram showing the positional relationship of three colored lights when emitted from a prism in the first period; FIG. 10 is a schematic diagram showing the rotational position of the prism in the second period; FIG. 11 is a schematic diagram showing the positional relationship of three colored lights when emitted from the prism in the second period; FIG. 10 is a schematic diagram showing rotational positions of a plurality of mirrors in a first period in the projector of the fourth embodiment; FIG. 10 is a schematic diagram showing the positional relationship of four colored lights when they are emitted from the mirror in the first period; FIG. 11 is a schematic diagram showing rotational positions of a plurality of mirrors in a second period; FIG. 10 is a schematic diagram showing the positional relationship of four colored lights when they are emitted from the mirror in the second period;

[First embodiment]
A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1A is a schematic configuration diagram of the projector 1 of the first embodiment. FIG. 1B is a schematic diagram of the arrangement of four colored lights emitted from the light source device 2 as seen from the +Z direction. FIG. 2 is an enlarged view of the light modulation device 6. FIG.
In addition, in each drawing below, in order to make each component easy to see, the scale of dimensions may be changed depending on the component.

The projector 1 according to the present embodiment modulates light emitted from the light source device 2 to form an image according to image information, and projects the formed image in an enlarged manner onto a projection surface such as a screen. In other words, the projector 1 forms an image by modulating the light emitted from the light source device 2 with one light modulation device 6 having one liquid crystal panel 61, and projects the formed image. The projector 1 is a so-called single-panel projector.

As shown in FIG. 1A, the projector 1 includes a light source device 2, a homogenization device 4, a switching section 3, a field lens 5, an optical modulation device 6, and a projection optical device . The light source device 2, homogenization device 4, switching unit 3, field lens 5, light modulation device 6, and projection optical device 7 are arranged at predetermined positions along the system optical axis Ax. The system optical axis Ax is the optical axis of the light source device 2 and is defined as an axis along the traveling direction of the principal ray of the light L emitted from the light source device 2 .

In the following description, an axis parallel to the traveling direction of light emitted from the light source device 2 along the system optical axis Ax is defined as the Z axis, and the traveling direction of the light is defined as the +Z direction. Also, two axes that are orthogonal to the Z axis and are orthogonal to each other are defined as the X axis and the Y axis. Of the directions along these axes, the vertical direction upward in the space where the projector 1 is installed is the +Y direction. Also, the +X direction is the horizontal right when viewing an object on which light is incident along the +Z direction so that the +Y direction faces upward in the vertical direction. Although illustration is omitted, the direction opposite to the +X direction is the -X direction, the direction opposite to the +Y direction is the -Y direction, and the direction opposite to the +Z direction is the -Z direction.

The light source device 2 emits blue light LB having a wavelength band of, for example, 440 to 490 nm, red light LR having a wavelength band of, for example, 610 to 750 nm, and two green lights LG having a wavelength band of, for example, 500 to 560 nm. It emits the light L contained.
The blue light LB of this embodiment corresponds to the first light in the first wavelength band in the claims. The red light LR of this embodiment corresponds to the second light in the second wavelength band in the claims. The green light LG in this embodiment corresponds to the third light in the third wavelength band in the claims.

The light source device 2 includes a first light source unit 21 that emits blue light LB, a second light source unit 22 that emits red light LR, a third light source unit 23 that emits green light LG, and a green light LG. and a fourth light source unit 24 . The first light source unit 21, the second light source unit 22, the third light source unit 23, and the fourth light source unit 24 are arranged in two rows and two columns when viewed from the direction of the system optical axis Ax. The first light source unit 21, the second light source unit 22, the third light source unit 23, and the fourth light source unit 24 are arranged at equal distances from the system optical axis Ax. Also, the third light source unit 23 and the fourth light source unit 24, which emit the green light LG of the same color, are arranged diagonally when viewed from the direction of the system optical axis Ax.

In the case of this embodiment, the first light source unit 21 that emits the blue light LB is arranged on the +X side and the -Y side with respect to the system optical axis Ax. The second light source unit 22 that emits the red light LR is arranged on the -X side and the +Y side with respect to the system optical axis Ax. The third light source unit 23 that emits the green light LG is arranged on the +X side and the +Y side with respect to the system optical axis Ax. The fourth light source unit 24 that emits the green light LG is arranged on the -X side and the -Y side with respect to the system optical axis Ax.

That is, as shown in FIG. 1B, when viewed from the +Z direction along the system optical axis Ax, the blue light LB is emitted from a position on the +X side and -Y side with respect to the system optical axis Ax. The red light LR is emitted from a position on the -X side and the +Y side with respect to the system optical axis Ax. The green light LG is emitted from a position on the +X side and the +Y side and a position on the -X side and the -Y side with respect to the system optical axis Ax.

The first light source unit 21, the second light source unit 22, the third light source unit 23, and the fourth light source unit 24 differ only in the wavelength band of the laser light source, which is a light emitting element, and have the same overall configuration. Therefore, the specific configuration of the light source unit will be described using the first light source unit 21 as a representative.

The first light source unit 21 has a laser light source 31 , a collimator lens 32 , a condenser lens 33 , a diffusion plate 34 and a pickup lens 35 . The laser light source 31 emits blue light LB. The collimator lens 32 collimates the blue light LB emitted from the laser light source 31 . The condenser lens 33 condenses the blue light LB emitted from the collimator lens 32 toward the diffuser plate 34 . The diffusion plate 34 diffuses the blue light LB to a predetermined diffusion angle. The pickup lens 35 guides the blue light LB emitted from the diffusion plate 34 to the homogenizing device 4 at the subsequent stage.

Similarly, the second light source unit 22 has a red laser light source, a collimator lens, a condenser lens, a diffusion plate, and a pickup lens. Each of the third light source unit 23 and the fourth light source unit 24 has a green laser light source, a collimator lens, a condenser lens, a diffusion plate, and a pickup lens. In addition, the configuration of each of the light source units 21, 22, 23, and 24 is not particularly limited to the configuration described above. Also, as the light-emitting element, a light-emitting diode (LED) may be used instead of the laser light source, or a combination of an excitation light source and a phosphor may be used.

The homogenizing device 4 homogenizes the illuminance of the light L in the image forming area of the light modulating device 6 irradiated with the light L emitted from the light source device 2 . The homogenizing device 4 has a first multi-lens 41 , a second multi-lens 42 and a superimposing lens 43 . Note that, instead of the above configuration, a homogenization device having another configuration may be provided, or the homogenization device may not be provided.

The first multi-lens 41 has a plurality of lenses 411 arranged in a matrix in a plane orthogonal to the central axis of the light L incident from the light source device 2, that is, the system optical axis Ax. The first multi-lens 41 splits the light incident from the light source device 2 into a plurality of partial light fluxes by means of a plurality of lenses 411 .

The second multilens 42 is arranged in a matrix in a plane perpendicular to the system optical axis Ax, and has a plurality of lenses 421 corresponding to the plurality of lenses 411 of the first multilens 41 . A partial light beam emitted from the lens 411 facing the lens 421 is incident on each lens 421 . Each lens 421 causes the partial light flux to enter the superimposing lens 43 .

The superimposing lens 43 superimposes the plurality of partial light fluxes incident from the second multi-lens 42 on the image forming area of the light modulation device 6 . Specifically, the blue light LB, the red light LR, and the two green lights LG each divided into a plurality of partial light beams are sent through the field lens 5 by the second multi-lens 42 and the superimposing lens 43 to form light beams. The light is incident on each of a plurality of microlenses 621 forming a microlens array 62 of the modulation device 6, which will be described later, at different angles.

The configurations of the switching section 3 and the optical modulation device 6 will be described later in detail. A field lens 5 is arranged between the homogenizing device 4 and the light modulator device 6 . The field lens 5 collimates the light L emitted from the homogenizing device 4 and guides it to the light modulating device 6 .

The projection optical device 7 projects the light modulated by the light modulation device 6, that is, the light forming an image onto a projection surface (not shown) such as a screen. The projection optical device 7 has one or more projection lenses.

The light modulating device 6 modulates the light emitted from the light source device 2 . More specifically, the light modulation device 6 modulates each color light emitted from the light source device 2 and incident via the homogenization device 4, the switching unit 3 and the field lens 5 according to the image information, and converts the light into the image information. forming corresponding image light. The light modulation device 6 has one liquid crystal panel 61 and one microlens array 62 .

FIG. 2 is an enlarged schematic diagram of a part of the light modulation device 6 viewed from the -Z direction. In other words, FIG. 2 shows the correspondence between the pixels PX of the liquid crystal panel 61 and the microlenses 621 of the microlens array 62 .
As shown in FIG. 2, the liquid crystal panel 61 has a plurality of pixels PX arranged in a matrix in a plane perpendicular to the system optical axis Ax (Z-axis).

One pixel PX has a plurality of sub-pixels SX that modulate colored lights of different colors. In this embodiment, each pixel PX has four sub-pixels SX (SX1 to SX4). Specifically, the first sub-pixel SX1 is arranged at a position in the +X direction and the +Y direction with respect to the center of the rectangular pixel PX. A second sub-pixel SX2 is arranged at a position in the -Y direction in the +X direction. A third sub-pixel SX3 is arranged at a position in the -Y direction in the -X direction. A fourth sub-pixel SX4 is arranged at a position in the +Y direction in the -X direction. That is, the first sub-pixel SX1, the second sub-pixel SX2, the third sub-pixel SX3, and the fourth sub-pixel SX4 are arranged in this order clockwise from the upper right sub-pixel in FIG.

As shown in FIG. 1A, the microlens array 62 is provided on the light incident side (−Z side) with respect to the liquid crystal panel 61 . The microlens array 62 guides the plurality of colored lights LB, LR, LG incident on the microlens array 62 to individual pixels PX. The microlens array 62 has multiple microlenses 621 corresponding to multiple pixels PX.

As shown in FIG. 2, the plurality of microlenses 621 are arranged in a matrix in a plane perpendicular to the system optical axis Ax. In other words, the plurality of microlenses 621 are arranged in a matrix on a plane perpendicular to the central axis of the light incident from the field lens 5 . In this embodiment, one microlens 621 is provided corresponding to two sub-pixels arranged in the +X direction and two sub-pixels arranged in the +Y direction. That is, one microlens 621 is provided corresponding to four sub-pixels SX1 to SX4 arranged in two rows and two columns in the XY plane.

Blue light LB, red light LR and two green lights LG superimposed by the homogenizer 4 are incident on one microlens 621 at different angles. As a result, the microlens 621 distributes the color light incident on the microlens 621 to the sub-pixel SX corresponding to the color light and causes the color light to enter the subpixel SX.

As shown in FIG. 1A, the switching unit 3 is provided between the second multi-lens 42 and the superimposing lens 43 of the homogenizing device 4 . The switching section 3 has an image rotator 37 . The image rotator 37 has a prism 38 and a rotation mechanism 39 that rotates the prism.

The prism 38 is composed of a columnar body having a trapezoidal cross-sectional shape on the YZ plane in FIG. 1A. That is, the prism 38 has four side surfaces including a first side surface 38a, a second side surface 38b, a third side surface 38c, and a fourth side surface 38d, a light incident surface 38i, and a light exit surface 38o. Here, of the two rectangular side surfaces 38a and 38b, the side surface with the smaller area is referred to as the first side surface 38a, the side surface with the larger area is referred to as the second side surface 38b, and the two trapezoidal side surfaces are referred to as These are referred to as a third side surface 38c and a fourth side surface 38d, respectively. The light incident surface 38i and the light exit surface 38o are inclined with respect to the first side surface 38a and the second side surface 38b.

The prism 38 intersects the light entrance surface 38i and the light exit surface 38o of the prism 38, has a rotation axis Ac parallel to the system optical axis Ax, and is rotatable about the rotation axis Ac. The rotation axis Ac is located on the system optical axis Ax. Also, the rotating mechanism 39 is composed of, for example, a stepping motor, and rotates the prism 38 around the rotation axis Ac. By rotating the prism 38, the switching unit 3 directs the blue light LB, the red light LR, and the two green lights LG emitted from the light source device 2 to any one of the four sub-pixels SX1 to SX4. Whether or not to make the light incident is divided into four periods and switched temporally.

A specific example of switching the incident positions of the color lights LB, LR, and LG with respect to the four sub-pixels SX1 to SX4 will be described below.
FIG. 3A is a schematic diagram showing the rotational position of the prism 38 during the first period. FIG. 3B is a schematic diagram showing the positional relationship of four colored lights when emitted from the prism in the first period. FIG. 4A is a schematic diagram showing the rotational position of the prism 38 during the second period. FIG. 4B is a schematic diagram showing the positional relationship of the four colored lights emitted from the prism in the second period. FIG. 5A is a schematic diagram showing the rotational position of the prism 38 during the third period. FIG. 5B is a schematic diagram showing the positional relationship of the four colored lights emitted from the prism in the third period. FIG. 6A is a schematic diagram showing the rotational position of the prism 38 during the fourth period. FIG. 6B is a schematic diagram showing the positional relationship of the four colored lights emitted from the prism in the fourth period. 3B, 4B, 5B, and 6B show the state of viewing the light exit surface 38o of the prism 38 from the +Z side.

In the image rotator 37 having the prism 38 as described above, the light incident on the prism 38 is refracted at the light incident surface 38i, totally reflected at one of the side surfaces 38a, 38b, 38c, and 38d, and is reflected at the light exit surface 38o. By refraction, the positional relationship of the plurality of colored lights LB, LR, LG before entering the prism and the positional relationship after exiting the prism are exchanged. Furthermore, by rotating the prism 38, the image formed by the light emitted from the light exit surface 38o can be rotated by an angle that is twice the rotation angle of the prism 38. FIG.

Here, the angle between the first side surface 38a of the prism 38 and the XZ plane is defined as the rotation angle of the prism 38. As shown in FIG. Therefore, when the first side surface 38a of the prism 38 and the XZ plane are parallel, the rotation angle of the prism 38 is 0°. It is also assumed that the prism 38 rotates clockwise when the light incident surface 38i is viewed from the -Z side.

As shown in FIG. 3A, the rotation angle of the prism 38 is 0° in the first period. At this time, as shown in FIG. 3B, blue light LB is emitted from position P1 in the +Y direction in the +X direction, and green light LG is emitted from position P2 in the -Y direction in the +X direction, centering on the system optical axis Ax. , the red light LR is emitted from the position P3 in the -Y direction in the -X direction, and the green light LG is emitted from the position P4 in the +Y direction in the -X direction. Accordingly, in the first period, blue light LB is incident on the first sub-pixel SX1, green light LG emitted from the position P2 is incident on the second sub-pixel SX2, and red light LR is incident on the third sub-pixel SX3. , and the green light LG emitted from the position P4 enters the fourth sub-pixel SX4.

Next, as shown in FIG. 4A, the prism 38 is rotated by 45° from the state of the first period. That is, the rotation angle of the prism 38 is 45° in the second period. At this time, as shown in FIG. 4B, the positional relationship of each color light is rotated by 90° from the state in the first period. That is, with the system optical axis Ax as the center, green light LG is emitted from position P1 in the +Y direction in the +X direction, blue light LB is emitted from position P2 in the -Y direction in the +X direction, and -Y direction in the -X direction. The green light LG is emitted from the position P3 in the -X direction and the red light LR is emitted from the position P4 in the +Y direction. Accordingly, in the second period, the green light LG emitted from the position P1 enters the first sub-pixel SX1, the blue light LB enters the second sub-pixel SX2, and the green light LG emitted from the position P3 is incident on the third sub-pixel SX3, and the red light LR is incident on the fourth sub-pixel SX4.

Next, as shown in FIG. 5A, the prism 38 is further rotated by 45° from the state of the second period. That is, the rotation angle of the prism 38 is 90° in the third period. At this time, as shown in FIG. 5B, the positional relationship of each color light is further rotated by 90° from the state in the second period. That is, with the system optical axis Ax as the center, red light LR is emitted from a position P1 in the +Y direction in the +X direction, green light LG is emitted from a position P2 in the -Y direction in the +X direction, and -Y direction in the -X direction. The blue light LB is emitted from the position P3 in the -X direction and the green light LG is emitted from the position P4 in the +Y direction. Accordingly, in the third period, the red light LR is incident on the first sub-pixel SX1, the green light LG emitted from the position P2 is incident on the second sub-pixel SX2, and the blue light LB is incident on the third sub-pixel SX3. , and the green light LG emitted from the position P4 enters the fourth sub-pixel SX4.

Next, as shown in FIG. 6A, the prism 38 is further rotated by 45° from the state of the third period. That is, the rotation angle of the prism 38 is 135° in the fourth period. At this time, as shown in FIG. 6B, the positional relationship of each color light is further rotated by 90° from the state in the third period. That is, with the system optical axis Ax as the center, green light LG is emitted from position P1 in the +Y direction in the +X direction, red light LR is emitted from position P2 in the -Y direction in the +X direction, and -Y direction in the -X direction. The green light LG is emitted from the position P3 in the -X direction and the blue light LB is emitted from the position P4 in the +Y direction. Accordingly, in the fourth period, the green light LG emitted from the position P1 is incident on the first sub-pixel SX1, the red light LR is incident on the second sub-pixel SX2, and the green light LG emitted from the position P3. enters the third sub-pixel SX3, and blue light LB enters the fourth sub-pixel SX4.

After that, every time the prism 38 is rotated by 45°, the positional relationship of each color light is rotated by 90° from the state before rotation. In this way, the switching unit 3 causes the blue light LB to enter the first sub-pixel SX1, the green light LG to enter the second sub-pixel SX2, the red light LR to enter the third sub-pixel SX3, and the green light LG to enter the third sub-pixel SX3. A first period in which the light LG is incident on the fourth subpixel SX4, a green light LG is incident on the first subpixel SX1, a blue light LB is incident on the second subpixel SX2, and a green light LG is incident on the third subpixel. A second period in which the red light LR enters the fourth sub-pixel SX4 after entering SX3, and a second period in which the red light LR enters the first sub-pixel SX1, green light LG enters the second sub-pixel SX2, and blue light A third period in which LB is incident on the third sub-pixel SX3 and green light LG is incident on the fourth sub-pixel SX4, and a third period when green light LG is incident on the first sub-pixel SX1 and red light LR is incident on the second sub-pixel SX2. , the green light LG is incident on the third sub-pixel SX3, and the blue light LB is incident on the fourth sub-pixel SX4.

In the case of this embodiment, the image rotator 37 has a configuration that intermittently rotates the prism 38 at a predetermined timing instead of continuously rotating the prism 38 during image projection by the projector 1 . The predetermined timing is, for example, when the power of the projector 1 is turned on, or when a certain period of time has elapsed after the projector 1 is turned on. In any case, it is desirable not to write image data to the liquid crystal panel 61 while the prism 38 is being rotated. Conversely, it is desirable to rotate the prism 38 while image data is not written to the liquid crystal panel 61 . The image light thus modulated by the liquid crystal panel 61 is projected onto a projection surface such as a screen (not shown) by the projection optical device 7 .

In the projector 1 of this embodiment, the color light incident on the four sub-pixels SX1 to SX4 is switched temporally, so the image signals supplied to the four sub-pixels SX1 to SX4 are incident on the four sub-pixels SX1 to SX4. It switches temporally in conjunction with the switching of the color light. That is, in each of the sub-pixels SX1 to SX4 of the liquid crystal panel 61, the color light image data corresponding to the current period is written according to which one of the first period to the fourth period.

[Effect of the first embodiment]
The projector of this embodiment includes a light source device 2 that emits light L including blue light LB, red light LR, and green light LG, and a switching unit 3 that receives the light L emitted from the light source device 2. , and a light modulation device 6 for modulating the light L emitted from the switching unit 3 in accordance with image information. The light modulation device 6 has a liquid crystal panel 61 having a plurality of pixels PX, each of the plurality of pixels PX being a first sub-pixel SX1, a second sub-pixel SX2, a third sub-pixel SX3, and a fourth sub-pixel SX3. and a sub-pixel SX4. In the switching unit 3, the blue light LB enters the first sub-pixel SX1, the green light LG enters the second sub-pixel SX2, the red light LR enters the third sub-pixel SX3, and the green light LG enters the fourth sub-pixel SX3. A first period in which the green light LG is incident on the sub-pixel SX4, the green light LG is incident on the first sub-pixel SX1, the blue light LB is incident on the second sub-pixel SX2, the green light LG is incident on the third sub-pixel SX3, A second period in which the red light LR is incident on the fourth sub-pixel SX4, a second period in which the red light LR is incident on the first sub-pixel SX1, a green light LG is incident on the second sub-pixel SX2, and a blue light LB is incident on the third sub-pixel SX2. A third period in which the green light LG enters the fourth sub-pixel SX4 after entering the pixel SX3, and a third period in which the green light LG enters the first sub-pixel SX1, red light LR enters the second sub-pixel SX2, and the green light LG enters the second sub-pixel SX2. A fourth period in which the light LG is incident on the third sub-pixel SX3 and the blue light LB is incident on the fourth sub-pixel SX4 is temporally switched.

According to this configuration, the color lights LB, LR, and LG incident on the four sub-pixels SX1 to SX4 forming each pixel PX of the liquid crystal panel 61 are switched temporally. That is, the same color light does not always enter a specific sub-pixel. For example, focusing on the blue light LB, the blue light LB enters the first sub-pixel SX1 during the first period, enters the second sub-pixel SX2 during the second period, and enters the third sub-pixel SX3 during the third period. Then, in the fourth period, the light enters the fourth sub-pixel SX4. In particular, the blue light LB has higher energy than the red light LR and the green light LG, and is likely to damage the sub-pixels irradiated with the blue light LB. To address this problem, in the present embodiment, as described above, the sub-pixels to which the blue light LB is incident are switched temporally, so that the damage caused by the irradiation of the blue light LB is reduced, and the deterioration of the reliability of the liquid crystal panel 61 is suppressed. can do.

In the projector 1 of this embodiment, the light source device 2 includes a first light source unit 21 that emits blue light LB, a second light source unit 22 that emits red light LR, and a third light source unit 23 that emits green light LG. and a fourth light source unit 24 that emits green light LG. When viewed from above, the third light source unit 23 and the fourth light source unit 24 are arranged in two rows and two columns, and are arranged at diagonal positions when viewed from the direction of the system optical axis Ax.

According to this configuration, the projector 1 can correspond to the liquid crystal panel 61 in which one pixel is composed of four sub-pixels arranged in two rows and two columns. In addition, it is easy to deal with a pixel in which two sub-pixels for modulating green light LG with high luminosity are arranged diagonally.

In the projector 1 of this embodiment, the first light source unit 21, the second light source unit 22, the third light source unit 23, and the fourth light source unit 24 are arranged at equal distances from the system optical axis Ax, and the blue light LB, As the red light LR and the two green lights LG rotate about the system optical axis Ax, their incident positions on the light modulation device 6 are temporally switched.

According to this configuration, it is easy to realize a configuration in which the four color lights LB, LR, and LG are temporally evenly incident on the four sub-pixels SX1 to SX4.

In the projector 1 of this embodiment, the switching section 3 has an image rotator 37 .

According to this configuration, by using the existing image rotator 37, the switching section 3 having a simple configuration can be realized.

In the projector 1 of the present embodiment, the image rotator 37 has a prism 38 and a rotation mechanism 39 that rotates the prism 38 around a rotation axis Ac that intersects the light incident surface 38i and the light exit surface 38o of the prism 38. .

According to this configuration, the light L emitted from the light source device 2 is guided through the interior of the prism 38, so that the optical path length can be shortened, and a compact image rotator 37 can be constructed. spread can be suppressed.

In the projector 1 of this embodiment, the prism 38 intermittently rotates at predetermined timings.

With this configuration, the prism 38 can be rotated during a period in which image data is not written to the liquid crystal panel 61, so that the color lights LB, LR, and LG are not incident across adjacent sub-pixels. , the sub-pixel resolution can be maintained.

In the projector 1 of this embodiment, the light source device 2 has a laser light source.

With this configuration, it is possible to realize a compact projector with excellent image quality.

[Second embodiment]
A second embodiment of the present invention will be described below with reference to the drawings.
The configuration of the projector of the second embodiment is the same as that of the first embodiment, but the configuration of the switching section is different from that of the first embodiment. Therefore, description of the overall configuration of the projector is omitted.
FIG. 7 is a schematic configuration diagram of the projector of the second embodiment.
In FIG. 7, the same reference numerals are given to the same constituent elements as in the drawing used in the first embodiment, and the description thereof is omitted.

As shown in FIG. 7, the projector 11 includes a light source device 2, a homogenization device 4, a switching section 9, a field lens 5, an optical modulation device 6, and a projection optical device .

The switching section 9 has an image rotator 90 . The image rotator 90 has multiple mirrors and a rotation mechanism 94 that integrally rotates the multiple mirrors. In this embodiment, the image rotator 90 has three mirrors consisting of a first mirror 91 , a second mirror 92 and a third mirror 93 .

A first mirror 91 , a second mirror 92 , and a third mirror 93 are arranged in this order from the second multi-lens 42 toward the superimposing lens 43 . The first mirror 91 reflects the light emitted from the second multi-lens 42 toward the second mirror 92 . The second mirror 92 reflects the light emitted from the first mirror 91 toward the third mirror 93 . The third mirror 93 reflects the light emitted from the second mirror 92 toward the superimposing lens 43 . The first mirror 91 and the third mirror 93 are provided on the system optical axis Ax and arranged to be inclined with respect to the system optical axis Ax. The second mirror 92 is provided at a position that does not cross the system optical axis Ax, and is arranged parallel to the system optical axis Ax.

A first mirror 91, a second mirror 92, and a third mirror 93 intersect the first mirror 91 and the third mirror 93, have a rotation axis Ac parallel to the system optical axis Ax, and rotate around the rotation axis Ac. Three mirrors are integrally rotatable. The rotation axis Ac is located on the system optical axis Ax. Also, the rotating mechanism 94 is composed of, for example, a stepping motor, and rotates the three mirrors integrally about the rotation axis Ac. By integrally rotating the three mirrors, the switching unit 9 switches the blue light LB, the red light LR, and the two green lights LG emitted from the light source device 2 to any one of the four sub-pixels SX1 to SX4. sub-pixels are divided into four periods and switched temporally.

A specific example of switching the incident position of each color light with respect to four sub-pixels will be described below.
FIG. 8A is a schematic diagram showing rotational positions of three mirrors in the first period. FIG. 8B is a schematic diagram showing the positional relationship of four colored lights when they are emitted from the mirror in the first period. FIG. 9A is a schematic diagram showing the rotational positions of the three mirrors in the second period. FIG. 9B is a schematic diagram showing the positional relationship of the four colored light beams emitted from the mirror during the second period. FIG. 10A is a schematic diagram showing rotational positions of three mirrors in the third period. FIG. 10B is a schematic diagram showing the positional relationship of the four colored light beams emitted from the mirror during the third period. FIG. 11A is a schematic diagram showing the rotational positions of the three mirrors in the fourth period; FIG. 11B is a schematic diagram showing the positional relationship of the four colored light beams emitted from the mirror during the fourth period. 8B, 9B, 10B, and 11B show the third mirror 93 viewed from the +Z side.

In the image rotator 90 using the plurality of mirrors 91, 92, 93 as described above, as in the image rotator 37 of the first embodiment using the prism 38, the plurality of mirrors 91, 92, 93 can be integrally rotated. Thus, the image formed by the light emitted from the mirrors 91, 92, 93 can be rotated by an angle that is twice the rotation angle of the mirrors 91, 92, 93.

Here, the angle formed by the second mirror 92 and the XZ plane is defined as the rotation angle of the mirror. Therefore, when the second mirror 92 and the XZ plane are parallel, the rotation angle of the mirror is 0°. It is also assumed that the multiple mirrors rotate clockwise when viewed from the -Z side.

As shown in FIG. 8A, the rotation angle of the mirror is 0° in the first period. At this time, as shown in FIG. 8B, blue light LB is emitted from position P1 in the +Y direction in the +X direction, and green light LG is emitted from position P2 in the -Y direction in the +X direction, centering on the system optical axis Ax. , the red light LR is emitted from the position P3 in the -Y direction in the -X direction, and the green light LG is emitted from the position P4 in the +Y direction in the -X direction. Accordingly, in the first period, blue light LB is incident on the first sub-pixel SX1, green light LG emitted from the position P2 is incident on the second sub-pixel SX2, and red light LR is incident on the third sub-pixel SX3. , and the green light LG emitted from the position P4 enters the fourth sub-pixel SX4.

Next, as shown in FIG. 9A, the plurality of mirrors 91, 92, 93 are rotated by 45° from the state of the first period. That is, the rotation angle of the mirror is 45° in the second period. At this time, as shown in FIG. 9B, the positional relationship of each color light is rotated by 90° from the state in the first period. That is, with the system optical axis Ax as the center, green light LG is emitted from position P1 in the +Y direction in the +X direction, blue light LB is emitted from position P2 in the -Y direction in the +X direction, and -Y direction in the -X direction. The green light LG is emitted from the position P3 in the -X direction and the red light LR is emitted from the position P4 in the +Y direction. Accordingly, in the second period, the green light LG emitted from the position P1 enters the first sub-pixel SX1, the blue light LB enters the second sub-pixel SX2, and the green light LG emitted from the position P3 is incident on the third sub-pixel SX3, and the red light LR is incident on the fourth sub-pixel SX4.

Next, as shown in FIG. 10A, the plurality of mirrors 91, 92, 93 are further rotated by 45° from the state of the second period. That is, the rotation angle of the mirror is 90° in the third period. At this time, as shown in FIG. 10B, the positional relationship of each color light is further rotated by 90° from the state in the second period. That is, with the system optical axis Ax as the center, red light LR is emitted from a position P1 in the +Y direction in the +X direction, green light LG is emitted from a position P2 in the -Y direction in the +X direction, and -Y direction in the -X direction. The blue light LB is emitted from the position P3 in the -X direction and the green light LG is emitted from the position P4 in the +Y direction. Accordingly, in the third period, the red light LR is incident on the first sub-pixel SX1, the green light LG emitted from the position P2 is incident on the second sub-pixel SX2, and the blue light LB is incident on the third sub-pixel SX3. , and the green light LG emitted from the position P4 enters the fourth sub-pixel SX4.

Next, as shown in FIG. 11A, the plurality of mirrors 91, 92, 93 are further rotated by 45° from the state of the third period. That is, the rotation angle of the mirror is 135° in the fourth period. At this time, as shown in FIG. 11B, the positional relationship of each color light is further rotated by 90° from the state in the third period. That is, with the system optical axis Ax as the center, green light LG is emitted from position P1 in the +Y direction in the +X direction, red light LR is emitted from position P2 in the -Y direction in the +X direction, and -Y direction in the -X direction. The green light LG is emitted from the position P3 in the -X direction and the blue light LB is emitted from the position P4 in the +Y direction. Accordingly, in the fourth period, the green light LG emitted from the position P1 is incident on the first sub-pixel SX1, the red light LR is incident on the second sub-pixel SX2, and the green light LG emitted from the position P3. enters the third sub-pixel SX3, and blue light LB enters the fourth sub-pixel SX4.

After that, every time the plurality of mirrors 91, 92, and 93 are rotated by 45°, the positional relationship of each color light is rotated by 90° from the state before rotation. In this way, the switching unit 9 causes the blue light LB to enter the first sub-pixel SX1, the green light LG to enter the second sub-pixel SX2, the red light LR to enter the third sub-pixel SX3, and the green light to A first period in which LG is incident on the fourth sub-pixel SX4, a green light LG is incident on the first sub-pixel SX1, a blue light LB is incident on the second sub-pixel SX2, and a green light LG is incident on the third sub-pixel SX3. , red light LR enters the fourth sub-pixel SX4, red light LR enters the first sub-pixel SX1, green light LG enters the second sub-pixel SX2, and blue light LB enters the third sub-pixel SX3 and green light LG enters the fourth sub-pixel SX4, and green light LG enters the first sub-pixel SX1 and red light LR enters the second sub-pixel SX2. A fourth period in which the green light LG is incident on the third sub-pixel SX3 and the blue light LB is incident on the fourth sub-pixel SX4 is temporally switched.

In this embodiment, as in the first embodiment, the image rotator 90 rotates the mirrors 91 , 92 , 93 instead of continuously rotating the mirrors 91 , 92 , 93 during image projection by the projector 11 . 93 is intermittently rotated at a predetermined timing. The predetermined timing is, for example, when the power of the projector 11 is turned on, or when a certain period of time has elapsed after the projector 11 is turned on. In any case, it is desirable to rotate the mirrors 91 , 92 , 93 while image data is not written to the liquid crystal panel 61 . The image light thus modulated by the liquid crystal panel 61 is projected onto a projection surface such as a screen (not shown) by the projection optical device 7 .

In the projector 11 of the present embodiment, the color lights LB, LR, and LG incident on the four sub-pixels SX1 to SX4 are switched temporally, so the image signals supplied to the four sub-pixels SX1 to SX4 are They are switched temporally in conjunction with the switching of the color lights LB, LR, and LG incident on SX1 to SX4. That is, in each of the sub-pixels SX1 to SX4 of the liquid crystal panel 61, the color light image data corresponding to the current period is written according to which one of the first period to the fourth period.

[Effect of Second Embodiment]
In the projector 11 of the present embodiment as well, the same effect as in the first embodiment can be obtained such that the damage caused by the irradiation of the blue light LB can be reduced and the deterioration of the reliability of the liquid crystal panel 61 can be suppressed.

In the projector 11 of this embodiment, the image rotator 90 includes a plurality of mirrors 91, 92, and 93, and a plurality of mirrors 91, 92, and 93 centered on a rotation axis Ac that intersects some of the plurality of mirrors. and a rotation mechanism 94 for integrally rotating the .

With this configuration, the image rotator 90 becomes relatively lightweight, and the load on the rotation mechanism 94 can be reduced.

[Third embodiment]
A third embodiment of the present invention will be described below with reference to the drawings.
The configuration of the projector of the third embodiment is the same as that of the first embodiment, but the configuration of the liquid crystal panel is different from that of the first embodiment. Therefore, description of the overall configuration of the projector is omitted. The configuration of the liquid crystal panel will be described later.
In the drawings used in this embodiment, the same reference numerals are given to the same constituent elements as in the drawings used in the first embodiment, and the description thereof is omitted.

FIG. 12A is a schematic diagram showing the rotational position of the prism 38 during the first period. FIG. 12B is a schematic diagram showing the positional relationship of three colored lights when emitted from the prism in the first period. FIG. 13A is a schematic diagram showing the rotational position of the prism 38 during the second period. FIG. 13B is a schematic diagram showing the positional relationship of three colored lights emitted from the prism in the second period. 12B and 13B show the state of the light exit surface 38o of the prism 38 viewed from the +Z side.

As shown in FIGS. 12A and 13A, in the projector of this embodiment, the light source device includes a first light source unit 51 that emits blue light LB, a second light source unit 52 that emits red light LR, and green light LG. a third light source unit 53 that emits light, a diffusion plate 54 and a pickup lens 55 .

The first light source unit 51 has a laser light source that emits blue light LB. The second light source unit 52 has a laser light source that emits red light LR. The third light source unit 53 has a laser light source that emits green light LG. The first light source unit 51, the second light source unit 52, and the third light source unit 53 are linearly arranged in a direction (X-axis direction) orthogonal to the system optical axis Ax. The diffuser plate 54 is provided commonly to the three light source units 51 , 52 , 53 . The pickup lens 55 is provided corresponding to each of the first light source unit 51 , the second light source unit 52 , and the third light source unit 53 .

In the case of this embodiment, a color mixture prevention mask 56 is provided facing the light exit surface of the prism 38 . The color mixing prevention mask 56 prevents color mixing of different color lights. Note that the color mixing prevention mask 56 may not be provided.

In the projector of this embodiment, the liquid crystal panel that constitutes the light modulation device has a plurality of pixels. Although illustration is omitted, each of the plurality of pixels has a first sub-pixel, a second sub-pixel, and a third sub-pixel. The first sub-pixel, the second sub-pixel, and the third sub-pixel are arranged linearly in one direction (X-axis direction) of the liquid crystal panel. That is, the first sub-pixel, the second sub-pixel, and the third sub-pixel are arranged in the direction in which the three light source units 51, 52, 53 are arranged. The third sub-pixel is located between the first sub-pixel and the second sub-pixel.

The projector includes a switching section 3 composed of an image rotator 37 having a prism 38, as in the first embodiment. Therefore, also in this embodiment, by rotating the prism 38, the image formed by the light emitted from the light exit surface 38o of the prism 38 can be rotated by an angle that is twice the rotation angle of the prism 38. FIG.

A specific example of switching the incident position of each color light with respect to three sub-pixels will be described below.
As shown in FIG. 12A, the rotation angle of the prism 38 is 0° in the first period. At this time, as shown in FIG. 12B, blue light LB is emitted from position P1 in the +X direction, and red light LR is emitted from position P2 in the -X direction, with the system optical axis Ax as the center. Green light LG is emitted from a position P3 between . Thus, in the first period, blue light LB is incident on the first sub-pixel, red light LR is incident on the second sub-pixel, and green light LG is incident on the third sub-pixel.

Next, as shown in FIG. 13A, the prism 38 is rotated by 90° from the state of the first period. That is, the rotation angle of the prism 38 is 90° in the second period. At this time, as shown in FIG. 13B, the positional relationship of each color light is rotated by 180° from the state in the first period. That is, around the system optical axis Ax, red light LR is emitted from position P1 in the +X direction, blue light LB is emitted from position P2 in the -X direction, and green light is emitted from position P3 between positions P1 and P2. Light LG is emitted. Accordingly, in the second period, red light LR is incident on the first sub-pixel, blue light LB is incident on the second sub-pixel, and green light LG is incident on the third sub-pixel.

After that, every time the prism 38 is rotated by 90°, the positional relationship of each color light is rotated by 180° from the state before rotation. Thus, the switching unit 3 has a first period in which the blue light LB is incident on the first sub-pixel and the red light LR is incident on the second sub-pixel, and a first period in which the blue light LB is incident on the second sub-pixel and the red light LB is incident on the second sub-pixel. The emission position of the blue light LB and the emission position of the red light are switched temporally between the second period in which the light LR is incident on the first sub-pixel, and the emission position of the blue light LB and the emission position of the red light are centered on the emission position of the green light LG on the light emission surface 38o of the switching portion 3. The injection positions of LR are replaced with each other in terms of time.

Also in this embodiment, it is desirable to rotate the prism 38 during a period in which image data is not written to the liquid crystal panel. In addition, since the color light incident on the first sub-pixel and the second sub-pixel are switched temporally, the image signals supplied to the first sub-pixel and the second sub-pixel are switched between the first sub-pixel and the second sub-pixel. are switched temporally in conjunction with the switching of the color light incident on the .

[Effect of the third embodiment]
The projector of this embodiment includes a light source device that emits light including blue light LB, red light LR, and green light LG, a switching unit 3 that receives the light emitted from the light source device, and a switching unit 3. a light modulating device that modulates light emitted from the light according to image information. The light modulating device has a liquid crystal panel with a plurality of pixels, each of which has a first sub-pixel, a second sub-pixel and a third sub-pixel. The switching unit 3 has a first period during which the blue light LB is incident on the first sub-pixel and the red light LR is incident on the second sub-pixel, and a period during which the blue light LB is incident on the second sub-pixel and the red light LR is incident on the second sub-pixel. The second period of incidence on one sub-pixel is switched temporally, and the emission position of the blue light LB and the emission position of the red light LR are changed around the emission position of the green light LG on the light emission surface 38o of the switching portion 3. and replace each other in time.

According to this configuration, color light incident on two sub-pixels among three sub-pixels forming each pixel of the liquid crystal panel is temporally switched. That is, the same color light does not always enter a specific sub-pixel. For example, focusing on the blue light LB, the blue light LB enters the first sub-pixel during the first period and enters the second sub-pixel during the second period. In particular, the blue light LB has higher energy than the red light LR and the green light LG, and is likely to damage the sub-pixels irradiated with the blue light LB. To address this problem, in the present embodiment, as described above, the sub-pixels to which the blue light LB is incident are switched temporally, so that the damage caused by the irradiation of the blue light LB is reduced, and the deterioration of the reliability of the liquid crystal panel is suppressed. can do. In addition, effects similar to those of the first embodiment can be obtained in the projector of the present embodiment as well.

[Fourth embodiment]
A fourth embodiment of the present invention will be described below with reference to the drawings.
The configuration of the projector of the fourth embodiment is the same as that of the first embodiment, and the configurations of the liquid crystal panel and the switching unit are different from those of the first embodiment. Therefore, description of the overall configuration of the projector is omitted.
In the drawings used in this embodiment, the same reference numerals are given to the same constituent elements as in the drawings used in the previous embodiments, and the description thereof is omitted.

FIG. 14A is a schematic diagram showing rotational positions of the mirrors 91, 92, and 93 in the first period. FIG. 14B is a schematic diagram showing the positional relationship of the three colored lights emitted from the third mirror 93 during the first period. FIG. 15A is a schematic diagram showing rotational positions of the mirrors 91, 92, and 93 during the second period. FIG. 15B is a schematic diagram showing the positional relationship of the three colored lights emitted from the third mirror 93 during the second period. 14B and 15B show the third mirror 93 viewed from the +Z side.

As shown in FIGS. 14A and 15A, in the projector of this embodiment, the light source device includes a first light source unit 51 that emits blue light LB and a second light source unit 51 that emits red light LR, as in the third embodiment. It has a unit 52 and a third light source unit 53 that emits green light LG. Also, each of the plurality of pixels in the liquid crystal panel has a first sub-pixel, a second sub-pixel, and a third sub-pixel.

The projector includes a switching section 9 composed of an image rotator 90 having a plurality of mirrors 91, 92, 93, as in the second embodiment. Therefore, in the present embodiment as well, by rotating the mirrors 91, 92, 93, the images of the light emitted from the mirrors 91, 92, 93 can be changed by the rotation angles of the mirrors 91, 92, 93. can be rotated by twice the angle of .

A specific example of switching the incident position of each color light with respect to three sub-pixels will be described below.
As shown in FIG. 14A, the rotation angle of the mirror is 0° in the first period. At this time, as shown in FIG. 14B, the blue light LB is emitted from the position P1 in the +X direction, the red light LR is emitted from the position P2 in the −X direction, and the positions P1 and P2 are emitted. Green light LG is emitted from a position P3 between . Thus, in the first period, blue light LB is incident on the first sub-pixel, red light LR is incident on the second sub-pixel, and green light LG is incident on the third sub-pixel.

Next, as shown in FIG. 15A, the plurality of mirrors 91, 92, 93 are rotated by 90° from the state of the first period. That is, the rotation angle of the mirror is 90° in the second period. At this time, as shown in FIG. 15B, the positional relationship of each color light is rotated by 180° from the state in the first period. That is, around the system optical axis Ax, red light LR is emitted from position P1 in the +X direction, blue light LB is emitted from position P2 in the -X direction, and green light is emitted from position P3 between positions P1 and P2. Light LG is emitted. Accordingly, in the second period, red light LR is incident on the first sub-pixel, blue light LB is incident on the second sub-pixel, and green light LG is incident on the third sub-pixel.

After that, every time the mirrors 91, 92, and 93 are rotated by 90°, the positional relationship of each color light is rotated by 180° from the state before rotation. In this way, the switching unit 9 has a first period in which the blue light LB is incident on the first sub-pixel and the red light LR is incident on the second sub-pixel, and a first period in which the blue light LB is incident on the second sub-pixel and the red light is incident on the second sub-pixel. The emission position of the blue light LB and the emission position of the red light LR are switched temporally between the second period in which the light LR is incident on the first sub-pixel, and the emission position of the blue light LB and the emission position of the red light LR are centered on the emission position of the green light LG. are replaced with each other in time.

Also in this embodiment, it is desirable to rotate the plurality of mirrors 91, 92, and 93 during a period in which image data is not written to the liquid crystal panel. In addition, since the color light incident on the first sub-pixel and the second sub-pixel are switched temporally, the image signals supplied to the first sub-pixel and the second sub-pixel are switched between the first sub-pixel and the second sub-pixel. are switched temporally in conjunction with the switching of the color light incident on the .

[Effect of the fourth embodiment]
In the projector of the present embodiment as well, the same effects as in the first embodiment can be obtained, such as the reduction of damage caused by the irradiation of the blue light LB and the suppression of deterioration in the reliability of the liquid crystal panel. In addition, the image rotator 90 becomes relatively lightweight, and the same effect as in the second embodiment can be obtained such that the load on the rotation mechanism can be reduced.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, the projector of the above embodiment has a configuration that intermittently rotates the image rotator at a predetermined timing, but instead of this configuration, it may have a configuration that continuously rotates the image rotator. .

In addition, the specific description of the shape, number, arrangement, etc. of each component of the projector is not limited to the above embodiment, and can be changed as appropriate. Also, the present invention may be applied to a display device that does not have a projection optical device.

A display device according to one aspect of the present invention may have the following configuration.
A display device according to one aspect of the present invention comprises a first light in a first wavelength band, a second light in a second wavelength band different from the first wavelength band, the first wavelength band and the second wavelength band. a light source device that emits light containing a third light in a third wavelength band different from the light source device; a switching unit that receives the light emitted from the light source device; and the light emitted from the switching unit as image information a light modulating device for modulating in response, the light modulating device comprising a liquid crystal panel having a plurality of pixels, each of the plurality of pixels having a first sub-pixel, a second sub-pixel, and a second sub-pixel; and 3 sub-pixels, wherein the switching section allows the first light to enter the first sub-pixel, the second light or the third light to enter the second sub-pixel, and the a first period in which two lights or the third light is incident on the third sub-pixel; and a period in which the first light is incident on the second sub-pixel and the second light or the third light is incident on the third sub-pixel. a second period in which the second light or the third light is incident on the first sub-pixel; and a second period in which the first light is incident on the third sub-pixel and the second light or the third light is incident on the first sub-pixel, and a third period during which the second light or the third light is incident on the second sub-pixel is temporally switched.

In the display device according to one aspect of the present invention, each of the plurality of pixels further includes a fourth sub-pixel, and the switching section allows the first light to enter the first sub-pixel, a first period in which light enters the second sub-pixel, the second light enters the third sub-pixel, and the third light enters the fourth sub-pixel; A second light is incident on one sub-pixel, the first light is incident on the second sub-pixel, the third light is incident on the third sub-pixel, and the second light is incident on the fourth sub-pixel. a period, the second light is incident on the first subpixel, the third light is incident on the second subpixel, the first light is incident on the third subpixel, and the third light is a third period in which the light enters the fourth sub-pixel, the third light enters the first sub-pixel, the second light enters the second sub-pixel, and the third light enters the third sub-pixel; A fourth period in which the first light enters the pixel and enters the fourth sub-pixel may be temporally switched.

In the display device according to one aspect of the present invention, the light source device includes a first light source unit that emits the first light, a second light source unit that emits the second light, and a third light source unit that emits the third light. 3 light source units and a fourth light source unit that emits the third light, wherein the first light source unit, the second light source unit, the third light source unit, and the fourth light source unit are the light sources When viewed from the direction of the optical axis of the device, they are arranged in two rows and two columns, and the third light source unit and the fourth light source unit are arranged at diagonal positions when viewed from the direction of the optical axis of the light source device. good too.

In one aspect of the display device of the present invention, the first light source unit, the second light source unit, the third light source unit, and the fourth light source unit are arranged at equal distances from the optical axis of the light source device. , the first light, the second light, and the two third lights may be rotated about the optical axis of the light source device, thereby temporally switching positions of incidence on the light modulation device. .

A display device according to another aspect of the present invention comprises: first light in a first wavelength band; second light in a second wavelength band different from the first wavelength band; a light source device emitting light including a third light in a third wavelength band different from the wavelength band; a switching section into which the light emitted from the light source device is incident; a light modulating device that modulates according to information, the light modulating device having a liquid crystal panel having a plurality of pixels, each of the plurality of pixels being a first sub-pixel and a second sub-pixel; , wherein the switching unit has a first period during which the first light is incident on the first sub-pixel and the second light is incident on the second sub-pixel; a second period in which the second light enters two sub-pixels and the second light enters the first sub-pixel; The emission position of the first light and the emission position of the second light are temporally replaced with each other.

In one aspect of the display device of the present invention, the switching section may have an image rotator.

In the display device according to one aspect of the present invention, the image rotator has a prism and a rotation mechanism that rotates the prism around a rotation axis that intersects the light incident surface and the light exit surface of the prism. may

In the display device according to one aspect of the present invention, the image rotator integrally rotates the plurality of mirrors and a rotation axis that intersects some mirrors among the plurality of mirrors. and a rotating mechanism.

In one aspect of the display device of the present invention, the image rotator may rotate intermittently at predetermined timings.

In one aspect of the display device of the present invention, the light source device may have a laser light source.

In the display device according to one aspect of the present invention, the first light may be blue light, the second light may be red light, and the third light may be green light.

A projector according to one aspect of the present invention may have the following configuration.
A projector according to one aspect of the present invention includes a display device according to one aspect of the present invention, and a projection optical device that projects light emitted from the display device.

DESCRIPTION OF SYMBOLS 1, 11... Projector, 2... Light source device, 3... Switching part, 6... Optical modulation apparatus, 7... Projection optical apparatus, 9... Switching part, 21, 51... First light source unit, 22, 52... Second light source unit , 23, 53... Third light source unit 24... Fourth light source unit 31... Laser light source 37, 90... Image rotator 38... Prism 38i... Light entrance surface 38o... Light exit surface 39, 94... Rotation Mechanism 91 First mirror 92 Second mirror 93 Third mirror Ac Rotation axis Ax System optical axis LB Blue light (first light) LR Red light (second light) , LG... green light (third light), PX... pixel, SX... sub-pixel, SX1... first sub-pixel, SX2... second sub-pixel, SX3... third sub-pixel, SX4... fourth sub-pixel.

Claims (12)

first light in a first wavelength band, second light in a second wavelength band different from the first wavelength band, and third light in a third wavelength band different from the first and second wavelength bands and a light source device that emits light including
a switching unit into which light emitted from the light source device is incident;
a light modulating device that modulates light emitted from the switching unit according to image information;
with
The light modulation device has a liquid crystal panel having a plurality of pixels,
each of the plurality of pixels has at least a first sub-pixel, a second sub-pixel, and a third sub-pixel;
The switching unit is
The first light enters the first sub-pixel, the second light or the third light enters the second sub-pixel, and the second light or the third light enters the third sub-pixel. a first period to
The first light enters the second sub-pixel, the second light or the third light enters the third sub-pixel, and the second light or the third light enters the first sub-pixel. a second period to
The first light enters the third sub-pixel, the second light or the third light enters the first sub-pixel, and the second light or the third light enters the second sub-pixel. a third period to
A display device that switches over time. each of the plurality of pixels further has a fourth sub-pixel,
The switching unit is
The first light enters the first sub-pixel, the third light enters the second sub-pixel, the second light enters the third sub-pixel, and the third light enters the fourth sub-pixel. a first period of incidence on the sub-pixel;
The third light enters the first sub-pixel, the first light enters the second sub-pixel, the third light enters the third sub-pixel, and the second light enters the fourth sub-pixel. a second period of incidence on the sub-pixel;
The second light enters the first sub-pixel, the third light enters the second sub-pixel, the first light enters the third sub-pixel, and the third light enters the fourth sub-pixel. a third period of incidence on the sub-pixel;
The third light enters the first sub-pixel, the second light enters the second sub-pixel, the third light enters the third sub-pixel, and the first light enters the fourth sub-pixel. a fourth period of incidence on the sub-pixel;
2. The display device according to claim 1, which temporally switches between . The light source device
a first light source unit that emits the first light;
a second light source unit that emits the second light;
a third light source unit that emits the third light;
a fourth light source unit that emits the third light,
The first light source unit, the second light source unit, the third light source unit, and the fourth light source unit are arranged in two rows and two columns when viewed from the direction of the optical axis of the light source device,
3. The display device according to claim 2, wherein said third light source unit and said fourth light source unit are arranged at diagonal positions when viewed from the direction of the optical axis of said light source device. the first light source unit, the second light source unit, the third light source unit, and the fourth light source unit are arranged at equal distances from an optical axis of the light source device;
4. The positions of incidence of the first light, the second light, and the two third lights on the light modulation device are temporally switched by rotating about the optical axis of the light source device. The display device according to . first light in a first wavelength band, second light in a second wavelength band different from the first wavelength band, and third light in a third wavelength band different from the first and second wavelength bands and a light source device that emits light including
a switching unit into which light emitted from the light source device is incident;
a light modulating device that modulates light emitted from the switching unit according to image information;
with
The light modulation device has a liquid crystal panel having a plurality of pixels,
each of the plurality of pixels has at least a first sub-pixel and a second sub-pixel;
The switching unit is
a first period during which the first light is incident on the first sub-pixel and the second light is incident on the second sub-pixel;
a second period during which the first light is incident on the second sub-pixel and the second light is incident on the first sub-pixel;
to switch in time,
The display device, wherein the emission position of the first light and the emission position of the second light are temporally switched around the emission position of the third light on the light emission surface of the switching portion. The display device according to any one of claims 1 to 5, wherein the switching section has an image rotator. 7. The display device according to claim 6, wherein said image rotator has a prism and a rotation mechanism for rotating said prism around a rotation axis that intersects the light entrance surface and the light exit surface of said prism. 7. The image rotator according to claim 6, wherein said image rotator has a plurality of mirrors, and a rotation mechanism for integrally rotating said plurality of mirrors about a rotation axis that intersects a part of said plurality of mirrors. Display device as described. 9. The display device according to claim 7, wherein said image rotator intermittently rotates at a predetermined timing. 10. The display device according to any one of claims 1 to 9, wherein said light source device has a laser light source. 11. A display device according to any one of the preceding claims, wherein the first light is blue light, the second light is red light and the third light is green light. a display device according to any one of claims 1 to 11;
a projection optical device that projects light emitted from the display device;
A projector with

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