JP6194473B2 - Projection-type image display device and display system - Google Patents

Description

  The present disclosure relates to a projection display apparatus and display system, and more particularly to a projection display apparatus and display system that improve the sense of resolution while maintaining the quality of an image.

  Conventionally, in order to obtain high-resolution and high-quality images, a so-called wobbling element that controls the optical path of the image light generated by the image generation unit such as a liquid crystal panel and changes the display position on the projection surface is inserted. Such a projection display apparatus is known.

  By using this wobbling element, the projection display apparatus can provide a high-resolution video even when a video input signal having a resolution higher than the resolution of the video generation unit is input (for example, Patent Documents). 1).

JP 2006-047414 A

  In a conventional projection display device with a wobbling element inserted, for example, a projection mode in which the image generated by the image generation unit (display element) is inverted upside down when it is suspended from the ceiling, or left and right is inverted when it is installed on the back. When the change is made, the display position of each pixel on the projection plane viewed from the user and the relative position of each pixel on the video input signal do not match, and the video is broken was there.

  The present disclosure is intended to solve the above-described problem, and is a projection type capable of displaying an image having a high resolution feeling regardless of the projection mode by matching the operation of the wobbling element and the output timing of the image. An object is to provide a video display device.

  A projection display apparatus according to the present disclosure (for example, the projection display apparatus 100) includes an image generation section (for example, an image generation section 20) that generates image light based on an image input signal, and a projection plane for the image light. A projection optical system (for example, the projection optical system 60) that projects onto the optical path, and an optical path changing unit (for example, the optical path changing unit 80) that is provided on the optical path of the image light and changes the display position on the projection plane of the image light. A control unit (for example, control unit 70) that controls the video generation unit and the optical path changing unit based on the video input signal. And it has several projection modes (for example, normal projection mode and 180 degree rotation mode) which can be changed according to the relationship between the attitude | position of an own apparatus, and a projection surface.

  In this projection display apparatus, the video input signal is composed of signal values exceeding the number of pixels of the video generation unit, and the control unit changes the projection mode and the optical path change unit operates. In addition, the display position on the projection surface is matched with the video input signal. This makes it possible to display an image having a high resolution feeling regardless of the projection mode.

  In the projection display apparatus described above, the control unit may match the display position on the projection surface with the image input signal by changing the order of signals output to the image generation unit. Thereby, it is realizable only by the signal processing in a control part.

  In the above projection display apparatus, the control unit may match the display position on the projection surface with the image input signal by controlling the optical path changing unit. As a result, it is possible to easily achieve matching even when combined with another projection display apparatus.

  The projection type video display apparatus temporally divides and outputs the video output signal for one frame to be output to the video generation unit, and sets the optical path changing unit according to the output timing of the divided video output signal. The display position is changed by driving.

  A display system (for example, display system 300) according to the present disclosure includes at least two projection video display devices (for example, projection video display devices 100A and 100B), and a control device (for example, PC 370) that controls them. . Each projection display apparatus includes a video generation unit (for example, video generation unit 20) that generates video light based on a video input signal, and a projection optical system (for example, projection optical system 60) that projects the video light onto a projection surface. ), An optical path changing unit (for example, an optical path changing unit 80) that changes the display position on the projection plane of the video light, and a control unit that controls the video generation unit and the optical path changing unit (For example, the control unit 70).

  Each projection display apparatus has a plurality of projection modes (for example, a normal projection mode and a 180 ° rotation mode) that can be changed according to the relationship between the posture of the own apparatus and the projection plane. The video input signal is composed of signal values that exceed the number of pixels of the video generation unit.

  In this display system, the control device sets the display position on the projection surface between the projection video display devices when the projection mode of each projection video display device is different and the optical path changing unit operates. Align. As a result, it is possible to achieve alignment among a plurality of projection-type image display devices, and to appropriately display high-resolution images.

  In the display system described above, the control device may be incorporated in one projection video display device (for example, the projection video display device 100A).

  According to the present disclosure, it is possible to provide a projection display apparatus capable of displaying an image having a high resolution feeling while maintaining the image quality.

1 is an external perspective view of a projection display apparatus according to the present disclosure. It is a block diagram which shows the structure of the projection type video display apparatus concerning this indication. It is a schematic diagram explaining the optical structure of the projection type video display apparatus concerning this indication. It is a schematic diagram which shows the optical structure from the image generation part which concerns on this indication to a projection optical system. It is a mimetic diagram for explaining an example of a lens unit concerning this indication. It is a block diagram explaining the composition of the control part concerning this indication. It is explanatory drawing which shows the relationship between a video input signal and a video output signal in case a video input signal is 4 times the resolution of a display element. It is explanatory drawing which shows the relationship between a video input signal and the video output signal of each sub-frame in case a video input signal is 4 times the resolution of a display element. It is explanatory drawing which shows the relationship of the display position on the screen of each sub-frame when projecting via an optical path change part. It is a timing chart which shows the relationship between the voltage waveform applied to an optical path change part, and the display position on a screen. It is a schematic diagram explaining the relationship between the image | video seen from the user in a 180 degree rotation mode, and the image | video produced | generated by a display element. It is a schematic diagram explaining the relationship between the image | video seen from the user in a 90 degree rotation mode, and the image | video produced | generated by a display element. It is a schematic diagram explaining the relationship between the image | video seen from the user in the left-right inversion mode, and the image | video produced | generated by a display element. It is a timing chart explaining the relationship between the operation | movement of the optical path change part in 180 degree rotation mode, and the image | video seen from the user. It is a timing chart explaining the relationship between the operation | movement of the optical path change part in 90 degree rotation mode, and the image | video seen from the user. It is a timing chart explaining the relationship between the operation | movement of the optical path change part in the left-right inversion mode, and the image | video seen from the user. It is a timing chart explaining the relationship between the operation | movement of the optical path change part in the 180 degree rotation mode which concerns on another form, and the image | video seen from the user. It is a timing chart explaining the relationship between the operation | movement of the optical path change part in the 90 degree rotation mode which concerns on another form, and the image | video seen from the user. It is a timing chart explaining the relationship between the operation | movement of the optical path change part in the left-right inversion mode which concerns on another form, and the image | video seen from the user. It is a mimetic diagram explaining the composition of the display system concerning this indication.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

The applicant provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims. Absent.
(Configuration of projection display device)
The configuration of the projection display apparatus 100 will be described with reference to FIGS. FIG. 1 is an external perspective view of the projection display apparatus 100. As shown in FIG. 1, the projection display apparatus 100 projects image light generated according to an image input signal onto a screen 500.

  FIG. 2 is a block diagram illustrating a configuration of the projection display apparatus 100. The projection display apparatus 100 includes a light source unit 10, a video generation unit 20 that generates video light in response to a video input signal, a light guide optical system 50 that guides light from the light source unit 10 to the video generation unit 20, and It has a projection optical system 60 that projects the generated image light onto the screen 500, and a control unit 70 that controls the light source unit 10, the image generation unit 20, and the like.

Although details will be described later, the projection display apparatus 100 further includes an optical path changing unit 80 for shifting the display position of the image light generated by the image generation unit 20 on the screen 500 within a range of the pixel pitch or less. Prepare. The projection display apparatus 100 displays the projection display by shifting the display position of the image light generated by the image generation section 20 on the screen 500 by, for example, 1/2 pixel by the optical path changing section 80. The apparatus 100 can provide an image with a high resolution.
(Optical configuration of the projection display)
The optical configuration of the projection display apparatus 100 will be described with reference to FIG. FIG. 3 is a schematic diagram showing an optical configuration of the projection display apparatus 100.

  The white light emitted from the light source unit 10 enters the lens 52 and is collected near the incident surface of the rod 54. The light incident on the rod 54 is reflected a plurality of times inside the rod, and is emitted with the light intensity distribution substantially uniform. The light emitted from the rod 54 is collected by the lens 56. The lens 56 is a relay lens that forms an image of the exit surface of the rod 54 on a DMD described later. After being reflected by the mirror 58, the light enters the total reflection prism 24 through the lens 22. The lens 22 is a lens that collects incident light substantially in parallel.

  The total reflection prism 24 is composed of two prisms, and a thin air layer 26 is interposed between adjacent surfaces of the prisms. The air layer 26 totally reflects light incident at an angle greater than the critical angle. The light that has entered the total reflection prism 24 via the lens 22 is reflected by the total reflection surface and enters the color prism 28.

  The color prism 28 includes three prisms, and a blue reflecting dichroic film 30 and a red reflecting dichroic film 32 are formed on the adjacent surfaces of the prisms. The light that has entered the color prism 28 is separated into blue, red, and green color light by the blue reflecting dichroic film 30 and the red reflecting dichroic film 32, and is incident on DMDs 34, 36, and 38, respectively. DMDs 34, 36, and 38 deflect the micromirrors into light incident on the projection lens constituting the projection optical system 60 and light traveling outside the effective projection lens in accordance with the video input signal.

  The light reflected by the DMDs 34, 36 and 38 is transmitted through the color prism 28 again. In the process of passing through the color prism 28, the separated blue, red, and green color lights are combined and enter the total reflection prism 24. Since the light incident on the total reflection prism 24 is incident on the air layer 26 at a critical angle or less, it is transmitted and incident on the projection optical system 60. In this way, the image light formed by the DMDs 34, 36, and 38 is projected on the screen.

Since the image generation unit 20 uses the DMDs 34, 36, and 38, the projection display apparatus 100 having higher light resistance and heat resistance than the liquid crystal panel can be configured. Further, since three DMDs are used, color reproduction is good and a bright and high-definition projected image can be obtained.
(Configuration of optical path changing unit)
The configuration of the optical path changing unit 80 of this embodiment will be described with reference to FIG. FIG. 4 is a schematic diagram illustrating an optical configuration from the image generation unit 20 to the projection optical system 60.

  The optical path changing unit 80 includes at least two or more lenses 82 and 84 and is configured to cancel the refractive index, and one of the lens units 86 on a plane perpendicular to the optical axis of the projection optical system 60. The piezoelectric elements 88 and 90 move the lens in two directions. The piezoelectric elements 88 and 90 are connected to a piezoelectric element driving unit 72 that supplies electric power to the piezoelectric elements 88 and 90 and controls expansion and contraction of the piezoelectric elements 88 and 90.

  The lens 82 of the lens unit 86 is a plano-concave lens having a flat surface on the total reflection prism 24 side and a concave lens on the other side. The flat surface of the lens 82 is fixed in contact with the total reflection prism 24. The lens 84 of the lens unit 86 is a plano-convex lens having a convex lens on the lens 82 side and a flat surface on the projection optical system 60 side. The lens 84 is disposed between the projection optical system 60 and the lens 82 with a predetermined interval between the projection optical system 60 and the lens 82.

  The piezoelectric elements 88 and 90 of the lens unit 86 are connected to the piezoelectric element driving unit 72, and the lens 84 is connected to the optical axis of the projection optical system 60 according to a driving signal (applied voltage) from the piezoelectric element driving unit 72. Are moved in at least two directions in a plane perpendicular to.

  FIG. 5 is a schematic diagram for explaining an example of the lens unit 86. As shown in FIG. 5, the piezoelectric elements 88 and 90 of the lens unit 86 include a lens outer frame 101, a lens inner frame 102, and a lens fixing member 103 made of a glass substrate.

  The lens inner frame 102 is provided with a column 104, a column 105, a column 106, and a column 107. The lens outer frame 101 is provided with a receiving hole 108, a receiving hole 109, a receiving hole 110, and a receiving hole 111. The column 104 is inserted into the receiving hole 108, the column 105 is inserted into the receiving hole 109, the column 106 is inserted into the receiving hole 110, and the column 107 is inserted into the receiving hole 111. The cross-sectional area of each hole is larger than the cross-sectional area of each column. Therefore, the lens inner frame 102 is held so as to be movable with respect to the lens outer frame 101.

  The lens fixing member 103 is provided with a column 112, a column 113, a column 114, and a column 115. The lens inner frame 102 is provided with a receiving hole 116, a receiving hole 117, a receiving hole 118, and a receiving hole 119. The support column 112 is inserted into the receiving hole 116, the support column 113 is inserted into the receiving hole 117, the support column 114 is inserted into the receiving hole 118, and the support column 115 is inserted into the receiving hole 119. The cross-sectional area of each hole is larger than the cross-sectional area of each column. Accordingly, the lens fixing member 103 is held movably with respect to the lens inner frame 102.

  The piezoelectric elements 88 and 90 are elements that vary in length when a voltage is applied, and perform an operation of expanding when the voltage is applied and shortening when the voltage application is stopped. The piezoelectric element 90 is fixed to the lens outer frame 101, and the piezoelectric element 88 is fixed to the lens inner frame 102. The piezoelectric element 90 is in contact with the lens inner frame 102, and the piezoelectric element 88 is in contact with the lens fixing member 103. The piezoelectric elements 88 and 90 are connected to the piezoelectric element driving unit 72, and the piezoelectric element driving unit 72 individually supplies driving signals (voltages) to the piezoelectric elements 88 and 90. The piezoelectric elements 88 and 90 perform an expansion operation when a driving signal is supplied from the piezoelectric element driving unit 72.

  The spring 122 is disposed in the vicinity of the piezoelectric element 90, and both ends thereof are fixed to the lens outer frame 101 and the lens inner frame 102, respectively. The spring 122 applies a tensile force by which the lens inner frame 102 and the lens outer frame 101 attract each other so as to oppose the force in the direction in which the piezoelectric element 90 extends. When the piezoelectric element 90 extends and pushes the lens inner frame 102, the lens inner frame 102 moves in the minus direction of the X axis with respect to the lens outer frame 101. Further, the piezoelectric element 90 is shortened and the spring 122 pulls the lens inner frame 102, whereby the lens inner frame 102 moves in the positive direction of the X axis with respect to the lens outer frame 101.

  The spring 123 is disposed in the vicinity of the piezoelectric element 88, and both ends thereof are fixed to the lens inner frame 102 and the lens fixing member 103, respectively. The spring 123 applies a tensile force by which the lens fixing member 103 and the lens inner frame 102 attract each other so as to oppose a force in a direction in which the piezoelectric element 88 extends. When the piezoelectric element 88 extends and pushes the lens fixing member 103, the lens 84 moves together with the lens fixing member 103 in the plus direction of the Y axis with respect to the lens inner frame 102. Further, when the piezoelectric element 88 is shortened and the spring 123 pulls the lens fixing member 103, the lens 84 moves together with the lens fixing member 103 in the negative direction of the Y axis with respect to the lens inner frame 102.

The piezoelectric element 90 and the spring 122 are located in the vicinity of the center of gravity G1 in the Y-axis direction of the lens portion that includes the lens 84, the lens inner frame 102 as a lens holding portion that holds the lens 84, and the lens fixing member 103. Has been placed. The piezoelectric element 88 and the spring 123 are disposed in the vicinity of the center of gravity G2 in the X-axis direction of the lens unit that includes the lens 84 and the lens fixing member 103 as a lens holding unit that holds the lens 84.
(Operation of control unit)
Control by the control unit 70 will be described with reference to FIGS. FIG. 6 is a block diagram illustrating the configuration of the control unit 70. The control unit 70 includes a video signal generation unit 74, a display element driving unit 76, and a piezoelectric element driving unit 72.

  The video input signal input to the control unit 70 is converted into a video output signal to be output to the DMDs 34, 36, 38 in the video signal generation unit 74 and is synchronized with the video light generated by the DMDs 34, 36, 38. Is converted into a sync signal for That is, the video signal generation unit 74 generates a video output signal and a synchronization signal based on the video input signal.

  When a video input signal having the same resolution as that of the DMDs 34, 36, and 38 is input, the video signal generation unit 74 uses the video input signals corresponding to the pixels of the DMDs 34, 36, and 38 as video output signals as they are as display elements. It outputs to the drive part 76. The display element driving unit 76 outputs the video output signal to each pixel of the DMDs 34, 36, and 38 based on the correspondence (address) between the video output signal and each pixel.

  When a video input signal having a resolution four times the resolution of the DMDs 34, 36, and 38 is input, the video signal generation unit 74 normally performs interpolated pixel signals (four pixel values) from four 2 × 2 signals. (Average value) is calculated and output as a video output signal to each pixel of the DMDs 34, 36, 38, or, as shown in FIG. Are sampled as video output signals and output to the display element driver 76.

  FIG. 8 and FIG. 9 are schematic diagrams for explaining the flow of signal processing when the optical path changing unit 80 is driven to display a quadruple-resolution video of the resolution of the DMDs 34, 36, and 38. As shown in FIG. 8, the video signal generation unit 74 temporally divides the video input signal for one frame into four subframes.

  Specifically, among the 4 × 2 signals, the upper left signal (for example, video input signal (00)) is the first subframe, and the upper right signal (for example, video input signal (10)). In the second subframe, the lower right signal (eg, video input signal (11)) is the third subframe, and the lower left signal (eg, video input signal (01)) is the fourth subframe video output signal. During one frame, the data is output to the display element driving unit 76 in this order. On the other hand, a synchronization signal is sent to the piezoelectric element driving unit 72 so that the timing at which each subframe is switched coincides with the timing at which the optical path changing unit 80 shifts the display position on the screen (changes the optical path of the image light). Output.

  Based on the synchronization signal, the optical path changing unit 80 shifts the display position on the screen, so that the optical path changing unit 80 displays the image of the first subframe in the DMDs 34, 36, and 38 as shown in FIG. The image light is projected at a predetermined position (reference position) on the screen, that is, an upper left (UL) position as viewed from the projection display apparatus 100 in this case.

  Next, while the image of the second subframe is displayed on the DMDs 34, 36, and 38, the optical path changing unit 80 moves to a position indicated by a solid line (in this case, moved 1/2 pixel leftward from the reference position indicated by the dotted line). The optical path is changed so that the image light is projected on the upper right (UR) position.

  While displaying the video of the third sub-frame in the DMDs 34, 36, and 38, the optical path changing unit 80 is further moved by 1/2 pixel in the downward direction, and is indicated by a solid line that is moved by 1/2 pixel in the vertical and horizontal directions from the reference position. The optical path is changed so that the image light is projected to the position (here, the lower right (DR) position).

Finally, while displaying the video of the fourth subframe in the DMDs 34, 36, and 38, the optical path changing unit 80 moved 1/2 pixel in the right direction and moved 1/2 pixel in the downward direction from the reference position. The optical path is changed so that the image light is projected at the position indicated by the solid line (here, the lower left (DL) position).
(Operation of the optical path changing unit)
FIG. 10 is a schematic diagram for explaining the relationship between the voltage applied to the piezoelectric elements 88 and 90 in each subframe and the display position on the screen. FIG. 10 illustrates a projection mode as shown in FIG. 1 in which the projection display apparatus 100 is placed on a horizontal desk or the like and projected onto a vertical screen.

  The installation state as shown in FIG. 1 where the projection display apparatus 100 is placed on a horizontal surface and projected onto a vertical reflective screen is referred to as “normal installation”. A projection mode in which an image is projected so as to match is referred to as a “normal projection mode”.

  As shown in FIG. 10, the piezoelectric element 88 and the piezoelectric element 90 are applied with a voltage phase shifted by a quarter period. Specifically, while the video output signal of the first subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 applies a voltage to the piezoelectric element 88 and the piezoelectric element 90 (ON state). At this time, in the normal projection mode, the upper left signal (for example, the video input signal (00) in FIG. 8) of the 2 × 2 signals is output and viewed from the user and the projection display apparatus 100. Thus, image light is projected at the UL position.

  Next, while the video output signal of the second subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 applies a voltage to the piezoelectric element 88 (ON state) and applies a voltage to the piezoelectric element 90. Is set to 0 (OFF state). At this time, in the normal projection mode, the upper right signal (for example, the video input signal (10) in FIG. 8) among the four signals of 2 × 2 is output and viewed from the user and the projection display apparatus 100. Thus, image light is projected at the UR position.

  While the video output signal of the third subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 sets the voltage applied to the piezoelectric element 88 and the piezoelectric element 90 to 0 (OFF state). At this time, in the normal projection mode, the lower right signal (for example, the video input signal (11) in FIG. 8 in FIG. 8) of the 2 × 2 signals is output, and the user and the projection video display are displayed. As viewed from the apparatus 100, image light is projected at the DR position.

  While the video output signal of the fourth subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 sets the voltage applied to the piezoelectric element 88 to 0 (OFF state) and applies the voltage to the piezoelectric element 90 ( (ON state). At this time, in the normal projection mode, the lower left signal (for example, the video input signal (01) in FIG. 8 in FIG. 8) among the four 2 × 2 signals is output, and the user and the projection display apparatus When viewed from 100, image light is projected at a DL position.

  By repeating the above operation for each frame, it is possible to match the pixel position of the original video input signal and display a video with a sense of resolution four times the resolution of the DMDs 34, 36, and 38.

The position where the image of the first sub-frame (UL image) is displayed on the screen when the projection display apparatus 100 is normally installed and projected in the normal projection mode is referred to as a “reference position”. Called. Similarly, the position displayed on the screen in one frame moves in the order of upper left (UL) → upper right (UR) → lower right (DR) → lower left (DL), that is, toward the screen. The rotation direction in which the display position moves clockwise is referred to as “reference deflection direction”.
(Explanation of projection mode)
Various projection modes will be described with reference to FIGS. 11A and 11B are schematic diagrams illustrating the 180 ° rotation mode, where FIG. 11A is a schematic diagram illustrating an example of use, and FIG. 11B is a schematic diagram illustrating the direction of an image generated by the DMD 34 (36, 38). is there. In the 180 ° rotation mode, as shown in FIG. 13, for example, a ceiling-mounting bracket is attached to the bottom of the projection display 100 shown in FIG. 1 and installed on the ceiling, and projected toward a vertical reflective screen. This is the projection mode used when

  In the normal projection mode, if the image is generated in the DMD 34 (36, 38) in the same manner as that viewed on the screen, the DMD 34 (36, 38) in the 180 ° rotation mode is different from the normal projection mode. In this state, an image (for example, F) is generated. Specifically, when an image is projected in the above-described installation state and in the 180 ° rotation mode, an image of the upper left pixel as viewed from the user is generated by the lower right pixel on the DMD 34. Specifically, the video input signal (00) at the upper left corner in FIG. 8 is output to the pixel at the lower right corner of the DMD 34 through a process of setting an address corresponding to the projection mode by the display element driving unit 76.

  12A and 12B show a 90 ° rotation mode, in which FIG. 12A is a schematic diagram showing an example of use, and FIG. 12B is a schematic diagram showing the direction of an image generated by the DMD 34 (36, 38). In the 90 ° rotation mode, as shown in FIG. 12, for example, when the projection display 100 shown in FIG. 1 is installed in a laid state and a vertically long image is projected onto a vertical reflective screen, for example. This is the projection mode used.

  In the normal projection mode, if the image is generated in the DMD 34 (36, 38) in the same manner as that viewed on the screen, the DMD 34 (36, 38) in the 90 ° rotation mode is different from the normal projection mode. In this state, an image (for example, F) is generated. Specifically, when the image is projected in the 90 ° rotation mode while being laid down on the right side toward the paper surface, the image of the upper left pixel as viewed from the user is the lower left end on the DMD 34. Of pixels.

  FIGS. 13A and 13B are left and right reversal modes, where FIG. 13A is a schematic diagram illustrating an example of use, and FIG. 13B is a schematic diagram illustrating the direction of an image generated by the DMD 34 (36, 38). As shown in FIG. 13, the left / right reversal mode is a projection mode used when, for example, the projection display apparatus 100 is placed on a horizontal surface and projected onto a vertical transmission screen.

  In the normal projection mode, if the image is generated in the DMD 34 (36, 38) in the same manner as that viewed on the screen, the DMD 34 (36, 38) in the left-right reversal mode corresponds to the normal projection mode. In the mirrored state, an image (for example, F) is generated. Specifically, when an image is projected in the above-described installation state and in the horizontal reversal mode, an image of the upper left pixel as viewed from the user is generated by the upper right pixel on the DMD 34.

  Each mode is switched between each other by a mode control signal from the outside such as a remote control operation by the user. Specifically, returning to FIG. 6, the video signal generation unit 74 receives a mode control signal from the outside. The video signal generation unit 74 outputs the sampled video output signal and the mode control signal to the display element driving unit 76 based on the mode control signal. The display element driving unit 76 also sets an address to the video output signal based on the mode control signal, and outputs the video output signal to each of the DMDs 34, 36, and 38.

At this time, if the image displayed on the DMD 34, 36, 38 and the display position of the image by the optical path changing unit 80 and the rotation direction of the display position are not matched, the image projected on the screen may be broken. is there.
(Linking with projection mode)
[First Embodiment]
In the present embodiment, in order to match the video displayed on the DMDs 34, 36, and 38 with the display position on the screen by the optical path changing unit 80, the video signal generating unit 74 changes the output order of the video output signals. change.

  In the normal projection mode, among the 2 × 2 signals, the upper left signal (for example, the video input signal (00) in FIG. 8) as the first subframe and the upper right signal (for example, the second subframe) , The video input signal (10)), the lower right signal (eg, video input signal (11)) as the third subframe, and the lower left signal (eg, video input signal (01)) as the fourth subframe. Output in order. The optical path changing unit 80 moves the image clockwise from the reference position which is the upper left position when viewed from the projection display apparatus 100 in accordance with the output order.

  On the other hand, in the 180 ° rotation mode, as shown in FIG. 14, when the optical path changing unit 80 moves the image clockwise from the reference position that is the upper left position when viewed from the projection display apparatus 100, The viewed display position on the screen is in the order of DR → DL → UL → UR. Therefore, the video signal generation unit 74 adjusts to the optical path changing unit 80, so that the lower right signal (for example, the video input signal (11) in FIG. 8) as the first subframe and the lower left signal (for example, the second subframe) , The video input signal (01)), the upper left signal (eg, video input signal (00)) as the third subframe, and the upper right signal (eg, video input signal (10)) as the fourth subframe. And output to the display element driver 76. As a result, the video is not broken.

  As shown in FIG. 15, in the 90 ° rotation mode, when the optical path changing unit 80 moves the image clockwise from the reference position when viewed from the projection display apparatus 100, the display position on the screen viewed from the user is , UR → DR → DL → UL. Therefore, the video signal generation unit 74 matches the optical path changing unit 80 with the upper right signal (for example, the video input signal (10) in FIG. 8) as the first subframe and the lower right signal (for example, the second subframe). , The video input signal (11)), the lower left signal (eg, video input signal (01)) as the third subframe, and the upper left signal (eg, video input signal (00)) as the fourth subframe. And output to the display element driver 76.

  As shown in FIG. 16, in the left-right reversal mode, when the optical path changing unit 80 moves the image clockwise from the reference position when viewed from the projection display apparatus 100, the display position on the screen viewed from the user is The order is UR → UL → DL → DR. Therefore, the video signal generation unit 74 matches the optical path changing unit 80 with the upper right signal (for example, the video input signal (10) in FIG. 8) as the first subframe and the upper left signal (for example, the second subframe, for example). The video input signal (00)), the lower left signal (eg, video input signal (01)) as the third subframe, and the lower right signal (eg, video input signal (11)) as the fourth subframe are sampled in this order. And output to the display element driver 76.

  In summary, when the voltage waveform applied to the piezoelectric elements 88 and 90 of the optical path changing unit 80 is constant (reference deflection direction) regardless of the projection mode, it is output from the video signal generating unit 74 to the display element driving unit 76. The output order of each subframe may be changed as shown in Table 1 depending on each projection mode. The numbers in the table represent the 2 × 2 four signals (00, 01, 10, 11) at the upper left of the video input signal in FIG. 8 as representatives.

As described above, according to the present embodiment, the video displayed on the DMDs 34, 36, and 38 and the optical path changing unit are changed by changing the output order of the video output signals of the subframes in conjunction with the projection mode. The display position on the screen according to 80 can be matched. Thereby, a high resolution video can be appropriately displayed.
[Second Embodiment]
In this embodiment, in order to match the images displayed on the DMDs 34, 36, and 38 with the display position on the screen by the optical path changing unit 80, the optical path changing unit 80 moves the display position in the moving order (rotation direction). ).

  Specifically, the output order of the video output signals output from the video signal generation unit 74 is constant regardless of the projection mode (for example, (00) → (10) → (11) → (In order of (01)). On the other hand, the video signal generation unit 74 outputs a synchronization signal based on a mode control signal from the outside when outputting the synchronization signal to the piezoelectric element driving unit 72. That is, as shown in FIGS. 17 to 19, the voltage waveform applied to the piezoelectric elements 88 and 90 is changed depending on each projection mode.

  FIG. 17 is a schematic diagram for explaining the relationship between the voltage applied to the piezoelectric elements 88 and 90 in each subframe and the display position on the screen in the 180 ° rotation mode. As shown in FIG. 17, while the image of the first subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 sets the voltage applied to the piezoelectric elements 88 and 90 to 0 (OFF state). To do. Thereby, the optical path changing unit 80 guides the image light to a lower right position when viewed from the projection display apparatus 100. On the other hand, the video (00) of the first subframe is visually recognized by the user at the upper left position of the screen.

  Next, while the image of the second subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 sets the voltage applied to the piezoelectric element 88 to 0 (OFF state) and applies the voltage to the piezoelectric element 90. (ON state). The optical path changing unit 80 guides the image light to the lower left position when viewed from the projection display apparatus 100, but the image (10) of the second subframe is visually recognized by the user at the upper right position of the screen.

  While the video of the third subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 applies a voltage (ON state) to the piezoelectric elements 88 and 90. The optical path changing unit 80 guides the image light to the upper left position when viewed from the projection display apparatus 100, but the image (11) of the third subframe is visually recognized by the user at the lower right position of the screen.

  While the images of the fourth subframe are displayed on the DMDs 34, 36, and 38, the control unit 70 applies a voltage to the piezoelectric element 88 (ON state) and sets the voltage applied to the piezoelectric element 90 to 0 (OFF state). ). The optical path changing unit 80 guides the image light to the upper right position when viewed from the projection display apparatus 100, but the image of the fourth subframe is visually recognized (01) by the user at the lower left position of the screen.

  FIG. 18 is a schematic diagram for explaining the relationship between the voltage applied to the piezoelectric elements 88 and 90 in each subframe and the display position on the screen in the 90 ° rotation mode. As shown in FIG. 18, while the image of the first subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 sets the voltage applied to the piezoelectric element 88 to 0 (OFF state) and sets the piezoelectric element 90. A voltage is applied to (ON state). Thereby, the optical path changing unit 80 guides the image light to the lower left position when viewed from the projection display apparatus 100. On the other hand, the video (00) of the first subframe is visually recognized by the user at the upper left position of the screen.

  Next, while the image of the second subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 applies a voltage to the piezoelectric element 88 and the piezoelectric element 90 (ON state). The optical path changing unit 80 guides the image light to the upper left position when viewed from the projection display apparatus 100, but the image (10) of the second subframe is visually recognized by the user at the upper right position of the screen.

  While the video of the third subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 applies a voltage to the piezoelectric element 88 (ON state) and sets the voltage applied to the piezoelectric element 90 to 0 (OFF state). ). The optical path changing unit 80 guides the image light to the upper right position when viewed from the projection display apparatus 100, but the image (11) of the third subframe is visually recognized by the user at the lower right position of the screen.

  While the video of the fourth subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 sets the voltage applied to the piezoelectric element 88 and the piezoelectric element 90 to 0 (OFF state). The optical path changing unit 80 guides the image light to the lower right position when viewed from the projection display apparatus 100, but the image of the fourth subframe is visually recognized (01) by the user at the lower left position of the screen.

FIG. 19 is a schematic diagram for explaining the relationship between the voltage applied to the piezoelectric elements 88 and 90 in each subframe and the display position on the screen in the left-right reversal mode. As shown in FIG.
While the image of the first subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 applies a voltage to the piezoelectric element 88 (ON state) and sets the voltage applied to the piezoelectric element 90 to 0 (OFF state). ). Thereby, the optical path changing unit 80 guides the image light to the upper right position when viewed from the projection display apparatus 100. On the other hand, the video (00) of the first subframe is visually recognized by the user at the upper left position of the screen.

  Next, while the image of the second subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 applies a voltage to the piezoelectric element 88 and the piezoelectric element 90 (ON state). The optical path changing unit 80 guides the image light to the upper left position when viewed from the projection display apparatus 100, but the image (10) of the second subframe is visually recognized by the user at the upper right position of the screen.

  While the image of the third subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 sets the voltage applied to the piezoelectric element 88 to 0 (OFF state) and applies the voltage to the piezoelectric element 90 (ON state). ). The optical path changing unit 80 guides the image light to the upper left position when viewed from the projection display apparatus 100, but the image (11) of the third subframe is visually recognized by the user at the lower right position of the screen.

  While the video of the fourth subframe is displayed on the DMDs 34, 36, and 38, the control unit 70 sets the voltage applied to the piezoelectric element 88 and the piezoelectric element 90 to 0 (OFF state). The optical path changing unit 80 guides the image light to the lower right position when viewed from the projection display apparatus 100, but the image of the fourth subframe is visually recognized (01) by the user at the lower left position of the screen.

As described above, according to the present embodiment, by changing the moving order of the display positions in conjunction with the projection mode, the images displayed on the DMDs 34, 36, and 38 and the screen by the optical path changing unit 80 are displayed. The display position can be matched with the display position. Thereby, a high resolution video can be appropriately displayed.
[Third Embodiment]
In the present embodiment, a control method in the case of displaying a common video using a plurality of projection video display devices 100 will be described.

  In recent years, in order to achieve high brightness or high resolution, many techniques for displaying video in synchronization with a plurality of display devices have been implemented. In this technical field, the same video is output from multiple projection video display devices, and stacking to achieve high brightness by superimposing them on the screen, or splitting one video from multiple projection video display devices Tiling that achieves high resolution by outputting the images and displaying them side by side on a screen is a typical technique.

  When stacking or tiling is performed using the projection display apparatus 100 having the optical path changing unit 80, there is a possibility that image quality deterioration due to an afterimage may occur. Specifically, in the portion where the image light is superimposed, the image quality is degraded such that the image is broken or the boundary is clearly visible. This is because, when different videos are displayed continuously at high speed, the appearance of the afterimage differs depending on how the video changes.

  In order to solve such a problem, it is necessary to synchronize the output timings of the video output signals and simultaneously match the display positions among the plurality of projection display apparatuses 100.

  FIG. 20 is a schematic diagram illustrating the configuration of a display system 300 using two projection video display devices. The display system 300 forms one image by tiling up and down. The projection display apparatus 100A is normally installed and projects in the normal projection mode, and the projection display apparatus 100B is installed on the ceiling and projects in the upside down mode. Between the projection areas from the two projection display apparatuses 100A and 100B, it is difficult to arrange the edges of the projection areas without any gaps, so that the projection is performed so that the image light is superimposed. The projection area where the image light is superimposed is subjected to signal processing for reducing the luminance by half (so-called blending) in order to prevent the luminance from becoming higher than the area where the image light is not superimposed.

  As shown in FIG. 20, in order to control the two projection display apparatuses 100A and 100B, a personal computer (PC 370) is connected as an external control apparatus to the two projection display apparatuses 100A and 100B. The PC 370 divides and outputs the video signal of the video to be displayed on each of the projection display apparatuses 100A and 100B. The video to be displayed includes the video of the superposed region.

  The PC 370 also outputs a mode control signal related to each projection mode to each of the projection display apparatuses 100A and 100B. Specifically, the PC 370 instructs the projection display apparatus 100A to project in the normal mode, and the projection display apparatus 100B has the piezoelectric element 88 of the optical path changing unit 80 as in the second embodiment. , 90 is changed to instruct to project in the 180 ° rotation mode.

As a result, the output order of the images projected on the screen matches between the projection display apparatus 100A and the projection display apparatus 100B, and the display position on the screen as seen by the user also matches. Therefore, even when a common image is displayed using a plurality of projection display apparatuses 100, the displayed image and the display position on the screen can be matched, and Matching between the projection type image display devices can also be achieved. Thereby, a high resolution video can be appropriately displayed.
[Other Embodiments]
Although the light source unit 10 is not particularly described in the above-described embodiment, a lamp light source or a solid light source, in particular, a light source that combines a laser light source and a phosphor can be used. Although the video generation unit 20 has been described with the configuration using three DMDs, the present invention is not limited to this, and the configuration using one DMD or a configuration using transmissive and reflective liquid crystal display elements as display elements is also possible. Can be implemented.

  In the above-described embodiment, the piezoelectric element is used as the drive source for vibrating the optical path changing unit 80. However, the present invention is not limited to this, and a voice coil motor or the like can also be used. The optical path changing unit 80 is disposed between the image generation unit 20 and the projection optical system 60, but may be disposed between the image generation unit 20 and the screen 500, for example, between lenses in the projection optical system 60. May be inserted. The lenses 82 and 84 of the lens unit 86 have been described in the configuration in which the image generating unit 20 is arranged in the order of the plano-concave lens and the plano-convex lens. However, the present invention is not limited to this and may be configured to cancel the refractive index. That's fine. Therefore, a configuration in which a plano-convex lens and a plano-concave lens are arranged in this order may be employed.

  In the above-described embodiment, the generation of the sub-frame video signal in the video signal generation unit has been described with the upper left signal as the first sub-frame. However, the present invention is not limited to this. Signals at other positions may be set as the first subframe, or an interpolation signal may be generated and set as the first subframe. Also, although the upper left signal is the first subframe and the direction in which the image is moved clockwise is the reference deflection direction, it may be counterclockwise.

  In the above-described embodiment, the four types of modes of the normal projection mode, the 180 ° rotation mode, the 90 ° rotation mode, and the left / right reversal mode have been described, but the present invention is not limited to this. When projecting from a projection-type image display device installed on a transmissive screen suspended from the ceiling, or when performing portrait display by rotating 270 °, it is possible to combine the above-described embodiments. It can be implemented.

  In the above-described embodiment, a PC is used as the external control device, and the PC instructs one of the two projection display devices to change the voltage waveform applied to the piezoelectric element of the optical path changing unit. Although the explanation to be performed has been described, it is not limited to this. The user may set each projection video display device. One projection video display device is a master, the other is a slave, and the master projection video display device is an external control device. You may instruct.

  As described above, the embodiment considered as the best mode and other embodiments are provided by the accompanying drawings and the detailed description. These are provided to those skilled in the art to illustrate the claimed subject matter by reference to specific embodiments. Therefore, various modifications, replacements, additions, omissions, and the like can be made to the above-described embodiments within the scope of the claims or an equivalent scope thereof.

  The present disclosure can be applied to a projection display apparatus such as a projector.

DESCRIPTION OF SYMBOLS 10 Light source part 20 Image | video production | generation part 22 Lens 24 Total reflection prism 26 Air layer 28 Color prism 30, 32 Dichroic film | membrane 34, 36, 38 DMD
DESCRIPTION OF SYMBOLS 50 Light guide optical system 52, 56 Lens 54 Rod 58 Mirror 60 Projection optical system 70 Control part 72 Piezoelectric element drive part 74 Image | video signal generation part 76 Display element drive part 80 Optical path change part 82, 84 Lens 86 Lens unit 88, 90 Piezoelectric Element 100, 100A, 100B Projection-type image display device 101 Lens outer frame 102 Lens inner frame 103 Lens fixing member 104, 105, 106, 107, 112, 113, 114, 115 Prop 108, 109, 110, 111, 116, 117 118, 119 Receiving hole 122, 123 Spring 300 Display system 370 PC
500 screens

Claims (2)

An image generation unit that generates image light based on an image input signal, a projection optical system that projects the image light onto a projection surface, and an optical path of the image light, and the image light on the projection surface A plurality of projection modes, each comprising: an optical path changing unit that changes a display position; and a control unit that controls the image generation unit and the optical path changing unit A first projection display apparatus having:
An image generation unit that generates image light based on an image input signal, a projection optical system that projects the image light onto a projection surface, and an optical path of the image light, and the image light on the projection surface A plurality of projection modes, each comprising: an optical path changing unit that changes a display position; and a control unit that controls the image generation unit and the optical path changing unit A second projection display device having
A control device for controlling the first projection display apparatus and the second projection display apparatus based on the image input signal;
In a display system comprising at least
The video input signal is composed of a number of signal values exceeding the number of pixels of each video generation unit,
The controller is
When the projection modes of the first projection display apparatus and the second projection display apparatus are different and the optical path changing unit operates,
In each of the first projection display apparatus and the second projection display apparatus, the displayed image and the display position on the screen are matched,
A display system characterized in that the output order of images projected on the projection plane is matched between the first projection display device and the second projection display device . The display system according to claim 1,
The display system, wherein the control device is built in the first projection display apparatus.