JP5538093B2 - Image display device and image display method - Google Patents

Description

  The present invention relates to an image display device and an image display method.

  2. Description of the Related Art A four-plate type image projection device is known that includes two green image display elements, one red image display element, and one blue image display element (see, for example, Patent Document 1). The video projection device disclosed in this document is provided with two green video display elements so that one green video is displayed with a shift of 0.5 pixels in the horizontal and vertical directions with respect to the other green video. Therefore, the horizontal and vertical resolutions visually recognized by the observer are twice the resolution of the video projection apparatus configured with a three-plate type.

JP 2009-109878 A

However, since the four-plate type image projection apparatus needs to include image display elements and optical systems for four systems, there is a problem that the scale of the circuit and the optical system becomes large.
On the other hand, if the interlace scanning technique used in a television receiver or the like is applied to an image projection apparatus, an image with a resolution twice as high as that in the vertical direction can be obtained using a three-plate image display element. However, when interlaced scanning is performed, when an image with a high frequency component such as a striped pattern or a checkered pattern is displayed, so-called interlaced interference such as unsightly flickering occurs and image quality deteriorates. Become.
The present invention has been made to solve the above problems, and an object of the present invention is to provide an image display device and an image display method capable of maintaining a high-quality display image and increasing a display resolution. .

[1] In order to solve the above-described problem, an image display device according to one embodiment of the present invention outputs a first color image light output unit that outputs first color image light and a second color image light. A second color image light output unit, a third color image light output unit for outputting a third color image light, a display optical system for displaying the first to third color image light, and A display position by the second and third color image light on the display surface displayed by the display optical system is a position shifted in a predetermined direction in the display surface with respect to the display position by the first color image light. The first display state and the display position by the second and third color image lights become the display position by the first color image light in the first display state, and the display position by the first color image light. Is a display position by the second and third color image lights in the first display state. To switch the second display state to be characterized by and a light path changing unit to change each output path from the color image light output unit from the first to the third.
With this configuration, the position of the pixel of the image by the first color image light and the position of the pixel of the image by the second color image light and the third color image light are complementarily determined every other image. The optical path changing unit changes each output optical path from the first to third display output units so as to shift in the direction. Thus, the image display device which is one embodiment of the present invention can increase the resolution of display in a predetermined direction and perform high-quality display.

[2] In the image display device according to [1], the first color image light is green image light, the second color image light is red image light, and the third color image light is It is a blue image light.
[3] The image display device according to [1], wherein the predetermined direction is a horizontal direction and / or a vertical direction in the display surface.
[4] In the image display device according to any one of [1] to [3], the optical path changing unit may alternately and repeatedly switch between the first display state and the second display state. The output light paths from the first to third color image light output units are changed.
[5] In order to solve the above problem, in the image display method according to one aspect of the present invention, the first to third color image light output units output the first to third color image lights, A first display state in which a display position by the second and third color image light is shifted in a predetermined direction in a display surface with respect to a display position by the first color image light; The display position by the third color image light is the display position by the first color image light in the first display state, and the display position by the first color image light is the second position in the first display state. The output light paths from the first to third color image light output units are changed so as to switch between the second display state that is the display position by the third color image light.

  According to the present invention, the display image quality can be kept high and the display resolution can be increased.

It is a block diagram which shows the whole structure of the projection type display system containing the projection type display apparatus to which the image display apparatus which is this embodiment is applied. It is a block diagram which shows the function structure of the optical unit part in this embodiment. In this embodiment, it is a timing chart which shows the operation | movement timing of a frame synchronizing signal and an optical path change control signal. It is a figure which shows typically the frame image in the state where the pixel displayed by green image light and the pixel displayed by each of red image light and blue image light are shifted by 0.5 pixels in the horizontal direction. . It is a figure which shows typically the synthesized image obtained by superimposing the image of the odd frame in FIG. 4, and the image of the even frame. It is a figure which shows typically the frame image in the state where the pixel displayed by green image light and the pixel displayed by each of red image light and blue image light are shifted by 0.5 pixels in the vertical direction. . It is a figure which shows typically the synthesized image obtained by superimposing the image of the odd frame in FIG. 6, and the image of the even frame. A frame image in a state where pixels displayed by green video light and pixels displayed by red video light and blue video light are displayed with a shift of 0.5 pixels in the horizontal and vertical directions is schematically shown. FIG. It is a figure which shows typically the synthesized image obtained by superimposing the image of the odd frame in FIG. 8, and the image of the even frame.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing an overall configuration of a projection display system including a projection display device to which an image display device according to this embodiment is applied. As shown in the figure, the projection display system 200 includes a video supply device 10 and a projection display device 20a.

The video supply device 10 is a video signal generation device that outputs a video signal and a synchronization signal, and a green video signal Gin that is a green video signal, a red video signal Rin that is a red video signal, and a blue video. The blue video signal Bin, which is the video signal of the video signal, and the frame synchronization signal F synchronized with the frame period of the video are supplied to the projection display device 20a. The video supply device 10 is, for example, a video playback device that plays back video content and outputs a video signal that is a playback signal and a synchronization signal, or a video camera device that outputs a video signal and a synchronization signal obtained by imaging. is there.
Note that, in addition to the red, green, and blue (RGB) video signals, control signals such as video synchronization signals and clock signals are supplied from the video supply device 10 to the projection display device 20a. Will describe only the green video signal Gin, the red video signal Rin, the blue video signal Bin, and the frame synchronization signal F, and a description of the other control signals will be omitted.

  The projection display device 20a is a projector device, which takes in a green video signal Gin, a red video signal Rin, a blue video signal Bin, and a frame synchronization signal F supplied from the video supply device 10 and a frame based on the frame synchronization signal F. The optical path of the video light to be output is changed based on the green video signal Gin, the red video signal Rin, and the blue video signal Bin so that the first display state and the second display state described above are alternately repeated in a cycle. Then, the green image light Gout, the red image light Rout, and the blue image light Bout, which are image lights after the optical path change, are projected.

The first display state refers to the pixel position of the frame image by the red video light Rout and the blue video light Bout with respect to the pixel position of the frame image by the green video light Gout, either horizontally or vertically. Is shifted by a distance of less than one pixel in the direction of. The second display state is the same as the pixel position of the frame image by the green video light Gout in the first display state and the pixel position of both the frame images by the red video light Rout and the blue video light Bout, This is a state in which the pixel position of the frame image by the green video light Gout is matched with the pixel position of both the frame images by the red video light Rout and the blue video light Bout in the first display state.
In other words, the projection display device 20a displays the frame image display position by the green video light Gout and the display positions of the two frame images by the red video light Rout and the blue video light Bout by switching complementarily in the frame period.

  The distance less than one pixel is a distance corresponding to 0.5 pixel as an example. In the present embodiment, the pixel shift amount in the horizontal direction and / or the vertical direction will be described as a distance corresponding to 0.5 pixels.

As shown in FIG. 1, the projection display device 20a includes an optical unit 21a, an optical path change control unit 22a, and a projection optical system (display optical system) 24.
The optical unit 21a includes an optical path changing unit that mechanically changes an optical path. The optical unit 21a is supplied with a green video signal Gin, a red video signal Rin, and a blue video signal Bin, and converts each video signal from an electrical signal to an optical signal. And the green image light Gout, the red image light Rout, and the blue image light Bout whose optical paths are controlled by the optical path changing unit are output.

The optical path change control unit 22a receives the frame synchronization signal F and receives an optical path change control signal Sg that alternately repeats the “OFF” state and the “ON” state in the frame period, and the “ON” state and “ An optical path change control signal Srb that alternately repeats the “OFF” state is generated and output. That is, the optical path change control signal Sg and the optical path change control signal Srb are in opposite phases. The case where the optical path change control signal Sg is in the “OFF” state and the optical path change control signal Srb is in the “ON” state corresponds to the first display state, and the optical path change control signal Sg is in the “ON” state. The case where the change control signal Srb is in the “OFF” state corresponds to the second display state.
Note that the image display apparatus according to the present embodiment includes the optical path change control unit 22a and the optical path change unit.

  The projection optical system 24 includes at least a projection lens, and projects the green image light Gout, the red image light Rout, and the blue image light Bout to the outside through the projection lens.

Next, a more detailed configuration of main components of the projection display device 20a will be described. FIG. 2 is a block diagram illustrating a functional configuration of the optical unit 21a. As shown in the figure, the optical unit 21a includes a light source unit 201, a blue light dichroic mirror 202, polarization beam splitters 203, 204, 209, 211, 214, a blue light display element (third color image light). Output unit) 205a, cross dichroic prism 207, yellow light dichroic mirror 208, green light dichroic mirror 210, red light display element (second color image light output unit) 212a, and green light display element (first Color image light output unit) 215a, a blue light optical path changing unit 221, a red light optical path changing unit 222, and a green light optical path changing unit 223. The blue light optical path changing unit 221, the red light optical path changing unit 222, and the green light optical path changing unit 223 are optical path changing units.
In the figure, an arrow indicated by a broken line indicates an outline of a light beam path, and an arrow indicated by a solid line indicates an electric signal path.

  The light source unit 201 includes a white light source and a polarization conversion element. White light emitted from the white light source passes through the polarization conversion element, and becomes S-polarized white light L whose polarization component is aligned with S-polarized light. The blue light dichroic mirror 202 reflects the blue light B having a blue light wavelength component in the S-polarized white light L emitted from the light source unit 201 and causes the light to enter the polarization beam splitter 203. The polarizing beam splitter 203 reflects the incident blue light B, which is S-polarized light, and makes it incident on the polarizing beam splitter 204. The polarization beam splitter 204 reflects the incident blue light B so as to enter the light receiving portion of the blue light display element 205a. The blue light display element 205a receives the supply of the blue video signal Bin from the video supply device 10 and displays it on the display unit. The blue light display element 205a modulates the blue light B incident on the light receiving unit and generates blue video light (first polarization). 3 color image light) and output to the cross dichroic prism 207.

  The yellow light dichroic mirror 208 reflects yellow light Ye having only a red light wavelength component and a green light wavelength component in the S-polarized white light L emitted from the light source unit 201 and makes the yellow light Ye enter the polarization beam splitter 209. The polarizing beam splitter 209 reflects the incident yellow light Ye, which is S-polarized light, and makes it incident on the green light dichroic mirror 210. The green light dichroic mirror 210 transmits the red light R having the red light wavelength component in the incident yellow light Ye and causes the red light R to enter the polarization beam splitter 211. On the other hand, the green light dichroic mirror 210 reflects the green light G having the green light wavelength component in the yellow light Ye so as to enter the polarization beam splitter 214.

  The polarization beam splitter 211 reflects the incident red light R and makes it incident on the light receiving portion of the red light display element 212a. The red light display element 212a receives the supply of the red video signal Rin from the video supply device 10 and displays the red video signal Rin on the display unit. The red light display element 212a modulates the red light R incident on the light receiving unit to generate red video light (first polarization). 2 color image light) and output to the cross dichroic prism 207. The polarization beam splitter 214 reflects the incident green light G and makes it incident on the light receiving portion of the green light display element 215a. The green light display element 215a receives the supply of the green image signal Gin from the image supply device 10 and displays it on the display unit. The green light display element 215a modulates the green light G incident on the light receiving unit and generates green image light (first polarization). 1 color image light) is output and incident on the cross dichroic prism 207.

The cross dichroic prism 207 reflects the blue video light supplied from the blue light display element 205a and outputs it as blue video light Bout, and reflects the red video light supplied from the red light display element 212a to reflect the red video light Rout. The green image light supplied from the green light display element 215a is transmitted and output as green image light Gout.
Each of the blue light display element 205a, the red light display element 212a, and the green light display element 215a is a transmissive display element, for example, a transmissive liquid crystal display element.

  The blue light optical path changing unit 221 moves the blue light display element 205a by a distance corresponding to 0.5 pixels in a predetermined direction based on the operation timing of the optical path change control signal Srb supplied from the optical path change control unit 22a. It is an optical path changing unit. Similarly, the red light optical path changing unit 222 moves the red light display element 212a by a distance corresponding to 0.5 pixels in a predetermined direction based on the operation timing of the optical path change control signal Srb supplied from the optical path change control unit 22a. This is an optical path changing unit that moves the minute. Further, the green light optical path changing unit 223 moves the green light display element 215a by a distance corresponding to 0.5 pixels in a predetermined direction based on the operation timing of the optical path change control signal Sg supplied from the optical path change control unit 22a. An optical path changing unit to be moved. Each of the blue light optical path changing unit 221, the red light optical path changing unit 222, and the green light optical path changing unit 223 includes, for example, a piezoelectric actuator to which a piezoelectric element that generates a force in a one-dimensional direction according to an applied voltage is applied. The That is, each of the blue light optical path changing unit 221, the red light optical path changing unit 222, and the green light optical path changing unit 223 has a blue light display element 205a, a red light display element 212a, and a green light in the direction of the force generated by the piezoelectric actuator. Each of the optical display elements 215a is moved by a distance corresponding to 0.5 pixels.

  The positions of the green light display element 215a, the red light display element 212a, and the blue light display element 205a in a state where the positions of the pixels of the respective frame images by the green image light Gout, the red image light Rout, and the blue image light Bout match. Assuming that the origin, that is, the displacement amount is “0” (zero), in order to displace the red image light Rout and the blue image light Bout in the u-axis positive direction in FIG. The amount of displacement of the position of the light display element 215a is set to “0” (zero), the red light display element 212a is displaced in the negative direction of the v-axis, and the blue light display element 205a is displaced in the positive direction of the v-axis. In addition, in order to displace the green image light Gout in the u-axis positive direction in the same figure with respect to the red image light Rout and the blue image light Bout, the displacement of each position of the red light display element 212a and the blue light display element 205a. The amount is set to “0” (zero), and the green light display element 215a is displaced in the u-axis positive direction.

  Next, the operation timing of the optical path change control signal Sg and the optical path change control signal Srb generated by the optical path change control unit 22a will be described. FIG. 3 is a timing chart showing operation timings of the frame synchronization signal F, the optical path change control signal Sg, and the optical path change control signal Srb. As shown in the figure, the frame synchronization signal F is a pulse signal that rises in a predetermined period at the beginning of each frame in the frame period of the video. This leading predetermined period may be, for example, a vertical blanking period. The optical path change control signal Sg is a signal that alternately repeats a low level (“OFF”) and a high level (“ON”) in synchronization with the rising edge of each pulse of the frame synchronization signal F. The optical path change control signal Srb is a signal that alternately repeats a high level (“ON”) and a low level (“OFF”) in synchronization with the rising of each pulse of the frame synchronization signal F. That is, the optical path change control signal Sg and the optical path change control signal Srb are signals that are in opposite phases. The period in which the optical path change control signal Sg is low level (“OFF”) and the optical path change control signal Srb is high level (“ON”) corresponds to the odd-numbered frame period, and the optical path change control signal Sg is high level. The period during which the optical path change control signal Srb is at the low level (“OFF”) corresponds to the even-numbered frame period.

Next, the operation of the projection display system 200 including the projection display device 20a to which the image display device according to the present embodiment is applied will be described. First, the video supply device 10 supplies a green video signal Gin, a red video signal Rin, a blue video signal Bin, and a frame synchronization signal F to the projection display device 20a.
When the projection display device 20a takes in the green video signal Gin, the red video signal Rin, the blue video signal Bin, and the frame synchronization signal F supplied from the video supply device 10, the green video signal Gin, the red video signal Rin, and blue The video signal Bin is supplied to the optical unit 21a, and the frame synchronization signal F is supplied to the optical path change control unit 22a.
When receiving the green video signal Gin, the red video signal Rin, and the blue video signal Bin, the optical unit 21a converts the green video signal Gin into the green video light Gout and outputs the red video signal Rin. The light is converted into light Rout and output, and the blue image signal Bin is converted into blue image light Bout and output. The green image Gout, red image light Rout, and blue image light Bout output from the optical unit 21a are projected to the outside through the projection lens system 24.

  Here, operations of the optical path change control unit 22a and the optical path change unit included in the optical unit unit 21a will be described. When receiving the frame synchronization signal F, the optical path change control unit 22a alternately repeats a low level (“OFF”) and a high level (“ON”) in the frame period, and the optical path change control signals having opposite phases to each other. Sg and an optical path change control signal Srb are generated and supplied to the optical unit 21a.

  When the optical path change control signal Sg supplied from the optical path change control unit 22a is at a low level (“OFF”) and the optical path change control signal Srb is at a high level (“ON”), that is, in an odd-numbered frame period. The green light path changing unit 223 that receives the supply of the optical path change control signal Sg enters a state in which the amount of displacement of the green light display element 215a on the u-axis becomes “0” (zero), and supplies the optical path change control signal Srb. The received red light path changing unit 222 displaces the position of the red light display element 212a by a distance corresponding to 0.5 pixels in the negative direction of the v-axis, and receives the supply of the optical path change control signal Srb. Moves the position of the blue light display element 205a by a distance corresponding to 0.5 pixels in the positive direction of the v-axis. As a result, the optical axes of the red video light Rout and the blue video light Bout are displaced by a distance corresponding to 0.5 pixels in the positive u-axis direction with respect to the optical axis of the green video light Gout.

  Further, when the optical path change control signal Sg supplied from the optical path change control unit 22a is at a high level (“ON”) and the optical path change control signal Srb is at a low level (“OFF”), that is, an even-numbered frame period. , The green light optical path changing unit 223 that receives the supply of the optical path changing control signal Sg displaces the green light display element 215a by a distance corresponding to 0.5 pixels in the u-axis positive direction, and the optical path changing control signal Srb. The red light optical path changing unit 222 and the blue light optical path changing unit 221 that receive supply of the red light display element 212a and the blue light display element 205a are in a state in which the displacement amount on the v-axis is “0” (zero). Thus, contrary to the odd-numbered frame period, the optical axis of the green video light Gout corresponds to 0.5 pixels in the positive u-axis direction with respect to both the optical axes of the red video light Rout and the blue video light Bout. Displace by distance.

Next, a pixel structure of a frame image displayed by projecting the green video light Gout, the red video light Rout, and the blue video light Bout by the projection display device 20a will be described. FIG. 4 shows a frame image in a state where the pixels displayed by the green video light Gout and the pixels displayed by the red video light Rout and the blue video light Bout are shifted by 0.5 pixels in the horizontal direction. It is a figure shown typically.
FIG. 5A is a diagram showing a part of an odd-numbered frame, and the red video light with respect to the position of the green pixel G in the frame image (the pixel pitch in the horizontal direction is Px) by the green video light Gout. The position of the red / blue pixel RB in the frame image (the pixel pitch in the horizontal direction is Px) by Rout and the blue video light Bout is 0.5 pixels (Px / 2) in the pixel shifting direction (X-axis positive direction). It shows a shifted state. FIG. 4B shows a part of an even frame. Contrary to the state of FIG. 4A, a frame image (horizontal pixel pitch in the horizontal direction) by red video light Rout and blue video light Bout. Is the position of the red / blue pixel RB of Px.), The position of the green pixel G of the frame image by the green video light Gout is 0.5 pixel in the pixel shift direction (X-axis positive direction) (Px / 2) Shows a shifted state.
That is, in FIGS. 4A and 4B, there is a displacement amount of 0.5 pixels in the horizontal direction between the odd-numbered frame and the even-numbered frame displayed by the projection display device 20, and the green pixel and the red color are displayed. The positional relationship with the blue pixel RB is complementary.

  FIG. 5 is a diagram schematically showing a composite image obtained by superimposing the odd frame image and the even frame image in FIG. 4. As shown in FIG. 5, the red, green, and blue pixels RGB of the composite image obtained by superimposing the odd frame image shown in FIG. 4A and the even frame image shown in FIG. The pixel pitch in the horizontal direction (X-axis direction) is Px / 2, and the horizontal resolution is doubled.

FIG. 6 shows a frame in a state where the pixels displayed by the green video light Gout and the pixels displayed by the red video light Rout and the blue video light Bout are shifted by 0.5 pixels in the vertical direction. It is a figure which shows an image typically.
FIG. 6A is a diagram showing a part of an odd-numbered frame, and the red video light with respect to the position of the green pixel G in the frame image (pixel pitch in the vertical direction is Py) by the green video light Gout. The position of the red / blue pixel RB in the frame image (pixel pitch in the vertical direction is Py) by Rout and the blue video light Bout is 0.5 pixels (Py / 2) in the pixel shifting direction (Y-axis positive direction). It shows a shifted state. FIG. 5B shows a part of an even frame. Contrary to the state of FIG. 5A, a frame image (pixel pitch in the vertical direction) by the red video light Rout and the blue video light Bout is shown. Is the position of the red / blue pixel RB in FIG. 5), the position of the green pixel G of the frame image by the green video light Gout is 0.5 pixel in the pixel shift direction (Y-axis positive direction) (Py / 2) Shows a shifted state.
That is, in FIGS. 4A and 4B, there is a displacement amount of 0.5 pixels in the vertical direction between the odd-numbered frame and the even-numbered frame displayed by the projection display device 20, and the green pixel and the red color are displayed. The positional relationship with the blue pixel RB is complementary.

  FIG. 7 is a diagram schematically showing a composite image obtained by superimposing the odd frame image and the even frame image in FIG. 6. As shown in FIG. 7, the red, green, and blue pixels RGB of the composite image obtained by superimposing the odd frame image shown in FIG. 6A and the even frame image shown in FIG. The pixel pitch in the vertical direction (Y-axis direction) is Py / 2, and the resolution in the vertical direction is doubled.

In FIG. 8, the pixels displayed by the green video light Gout and the pixels displayed by the red video light Rout and the blue video light Bout are displayed with a shift of 0.5 pixels in the horizontal and vertical directions. It is a figure which shows the frame image of a state typically.
FIG. 5A shows a part of an odd-numbered frame, and a green pixel of a frame image (the pixel pitch in the horizontal direction is Px and the pixel pitch in the vertical direction is Py) by the green video light Gout. The position of the red / blue pixel RB of the frame image (the pixel pitch in the horizontal direction is Px and the pixel pitch in the vertical direction is Py) by the red image light Rout and the blue image light Bout with respect to the position of G A state is shown in which the pixel is shifted by 0.5 pixels (Px / 2, Py / 2) in the pixel shifting direction (the positive direction in each of the X-axis direction and the Y-axis direction). FIG. 4B shows a part of an even frame. Contrary to the state of FIG. 4A, a frame image (horizontal pixel pitch in the horizontal direction) by red video light Rout and blue video light Bout. Is the position of the green pixel G of the frame image by the green video light Gout with respect to the position of the red / blue pixel RB in the vertical direction (the pixel pitch in the vertical direction is Py). A state in which the pixel is shifted by 0.5 pixels (Px / 2, Py / 2) in the positive direction in the Y-axis direction is shown.
That is, in FIGS. 4A and 4B, there is a displacement amount of 0.5 pixels in the horizontal direction and the vertical direction between the odd-numbered frame and the even-numbered frame displayed by the projection display device 20, respectively. The positional relationship between the green pixel and the red / blue pixel RB is complementary.

  FIG. 9 is a diagram schematically showing a composite image obtained by superimposing the odd frame image and the even frame image in FIG. 8. As shown in FIG. 9, the red, green, and blue pixels RGB of the composite image obtained by superimposing the odd frame image shown in FIG. 8A and the even frame image shown in FIG. The pixel pitch in the horizontal direction is Px / 2, the pixel pitch in the vertical direction is Py / 2, and the resolution in each of the horizontal direction and the vertical direction is doubled.

As described above, the projection display device 20a to which the image display device according to the present embodiment is applied is based on the operation timing of the optical path change control signal Sg and the optical path change control signal Srb generated by the optical path change control unit 22a. The optical path of the green video light Gout, the red video light Rout, and the blue video light Bout output by the optical unit 21a is changed to the pixel position of the frame image by the green video light Gout and the frame by the red video light Rout and the blue video light Bout. The optical path changing unit inside the optical unit 21a changes so that the pixel position of the image is complementarily shifted by 0.5 pixels every frame image.
Thereby, according to the projection type display device 20a in the present embodiment, the resolution can be doubled in a desired direction by using a three-plate type display element, and frequency components such as a stripe pattern and a checkered pattern can be obtained. When displaying a high image, it is possible to maintain high image quality without causing annoying flicker or the like.

  In the present embodiment, the pixel shift is complementarily performed between the frame image of the green video and the frame image of the red video and the blue video. In addition to this, pixel shift is complementarily performed between a blue video frame image and a green video image and a red video frame image, or between a red video frame image and a blue video image frame image and a green video frame image. The pixel shift may be performed in a complementary manner.

  In addition, the projection display device 20a in the present embodiment projects and displays a color image, but the present embodiment can also be applied to a color still image. When applied to a color still image, it can be realized by superimposing and displaying the frame image in the first display state and the frame image in the second display state.

  In the projection display device 20a according to the present embodiment, the optical unit 21a is configured using the blue light display element 205a, the red light display element 212a, and the green light display element 215a, which are transmissive display elements. The optical unit 21a may be configured using a reflective display element as both the display elements.

  Further, the image display device according to the present embodiment can be applied to a direct-view image display device such as a liquid crystal display device or a PDP (Plasma Display Panel) device in addition to the projection display device.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design etc. of the range which does not deviate from the summary of this invention are included.

DESCRIPTION OF SYMBOLS 10 Image | video supply apparatus 20a Projection type display apparatus 21a Optical unit part 22a Optical path change control part 24 Projection optical system (display optical system)
200 Projection Display System 201 Light Source Unit 202 Blue Light Dichroic Mirror 203, 204, 209, 211, 214 Modified Beam Splitter 205a Blue Light Display Element (Third Color Image Light Output Unit)
207 Cross dichroic prism 208 Yellow light dichroic mirror 210 Green light dichroic mirror 212a Red light display element (second color image light output unit)
215a Green light display element (first color image light output unit)
221 Blue light path changing section (light path changing section)
222 Red light path changing section (light path changing section)
223 Green light path changing section (light path changing section)

Claims (4)

A first color image light output unit for outputting first color image light of a frame image ;
A second color image light output unit that outputs a second color image light of the frame image ;
A third color image light output unit for outputting a third color image light of the frame image ;
A display optical system for displaying the first to third color image lights;
A display position of the second and third color image light on the display surface displayed by the display optical system is shifted in a predetermined direction in the display surface with respect to the display position of the first color image light; The first display state and the display position by the second and third color image light become the display position by the first color image light in the first display state, and the display by the first color image light. By alternately and repeatedly switching the second display state where the position is the display position by the second and third color image light in the first display state in correspondence with the frame period of the video, In both the display state and the second display state, the display position of the pixel by the first color image light is shifted from the display position of the pixel by the second and third color image light. Yo , An optical path changing unit for changing each output optical path from the color image light output unit from the first to the third,
An image display device comprising:   2. The first color image light is green image light, the second color image light is red image light, and the third color image light is blue image light. Image display device.   The image display apparatus according to claim 1, wherein the predetermined direction is a horizontal direction and / or a vertical direction in the display surface. The first to third color image light output units output the first to third color image light of the frame image ,
A first display state in which a display position by the second and third color image light is shifted in a predetermined direction in a display surface with respect to a display position by the first color image light; The display position by the third color image light is the display position by the first color image light in the first display state, and the display position by the first color image light is the second position in the first display state. And in the second display state also in the first display state by alternately switching between the second display state, which is the display position by the third color image light , in correspondence with the frame period of the video . Also, the first to third color images so that the display position of the pixel by the first color image light and the display position of the pixel by the second and third color image lights are shifted. Each from the optical output The image display method characterized by changing the force light path.

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