JP2016191756A - Liquid crystal projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection device for preventing projection light projected by respective liquid crystal projectors from overlapping each other in the case that a plurality of liquid crystal projectors perform multi-projection.SOLUTION: The projection device includes a panel which can control a display area larger than an effective image that can be displayed by the projection device, a detection part for detecting division area information displayed by the projection device in a division display from an external input, and a panel display control part for determining the display position of the effective image within the display area controlled by the panel. The panel display control part determines the display position of an effective image in accordance with division area information detected by the detection part.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a liquid crystal projector.

  Conventionally, it is generally known that a liquid crystal panel used for a liquid crystal projector has a function of shifting the position of an image drawn on the liquid crystal panel in order to adjust the position of a projected image on a screen and to correct a registration. Yes. Therefore, the liquid crystal panel has pixels capable of drawing an image exceeding the maximum resolution of the image displayed by the liquid crystal projector.

  This function will be described with reference to FIG. 3 showing the timing of an image input to the panel of the liquid crystal projector. The drive area 20 is an area in which panel pixels are formed, and is an area in which an image can be drawn. The effective image area 30 is an area where an image is actually displayed in the drive area 20. The upper and lower black bands or the like generally added when displaying a 16: 9 image on a panel with an aspect ratio of 4: 3 are not included in this range. Panel pixels are not formed in the non-driving area 10 outside the driving area 20.

  The area to be projected is the drive area 20, and by changing the position of the effective image area 30 in the drive area 20 and drawing an image on the panel, the position of the projected image can be adjusted and the registration can be corrected. it can. The non-driving area 10 is not a projection target.

  On the other hand, multi-projection is known in which projection images of a plurality of liquid crystal projectors are arranged and used as a single screen. As shown in FIG. 10, when performing multi-projection, the projection light projected by each liquid crystal projector may be used in a state of overlapping. In the projection area A shown in FIG. 10, the liquid crystal projector projects projection light with luminance γ onto the projection surface. However, since a part of the projection area B projected by another liquid crystal projector overlaps, the brightness of this overlap area is the sum (γ ′) of the brightness of the two projectors. That is, there is a problem in that a difference in brightness of the projection light occurs between the region where the projection light overlaps and the region where the projection light does not overlap on the projection surface. According to Patent Document 1, the luminance difference is made uniform by providing the luminance offset for each region, and the unity feeling of the entire screen is maintained.

JP 2012-234072 A

  However, in the technique of Patent Document 1, in order to raise the luminance γ of the non-overlapping region so as to approach γ ′ with an offset in accordance with the luminance γ ′ raised by overlapping the projection lights projected by the respective liquid crystal projectors. Contrast is lowered. That is, when the projection lights projected by the respective liquid crystal projectors overlap each other, a luminance difference occurs in the projection screen, and when this is corrected, there is a problem in that a decrease in contrast occurs.

  Accordingly, an object of the present invention is to provide a projection device in which projection light projected by each liquid crystal projector does not overlap when multiple projection is performed by a plurality of liquid crystal projectors.

In order to achieve the above object, the projection apparatus of the present invention provides:
A panel capable of controlling a display area larger than an effective image that can be displayed by the projector;
A detection unit for detecting divided area information displayed by the projection apparatus in divided display;
A panel display control unit for determining a display position of an effective image within a display area controlled by the panel;
The panel display control unit determines the display position of the effective image according to the divided area information detected by the detection unit.

  According to the projection device of the present invention, the position of the video signal drawn in the panel area is controlled according to the multi-projection setting, and even when the projection images projected by the respective liquid crystal projectors are adjacent to each other on the projection plane. The projection lights do not overlap with each other, and it is possible to suppress the occurrence of image quality deterioration.

1 is a diagram showing an overall configuration of a liquid crystal projector 100 of the present invention. 4 is a flowchart for explaining control of basic operations of the liquid crystal projector 100 of the present invention. It is a figure showing the timing of the image input into the liquid crystal element 151 of the liquid crystal projector 100 of this invention. It is a figure which shows the realization method of the display position control of the image with respect to the liquid crystal element 151 of the liquid crystal projector 100 of this invention. It is a figure which shows the structure of the part used as the characteristic of the liquid crystal projector 100 of this invention. 6 is a diagram illustrating a relationship between a video signal input to the liquid crystal element 151 and a projection image in Embodiment 1. FIG. 3 is a flowchart illustrating the characteristics of the operation in the first embodiment. 6 is a diagram illustrating a relationship between a video signal input to a liquid crystal element 151 and a projection image in Embodiment 2. FIG. 10 is a flowchart illustrating the characteristics of the operation in the second embodiment. It is a figure which shows the subject of this invention. 2 is a diagram showing a configuration when performing multi-projection with two liquid crystal projectors 100 and 200. FIG.

  Hereinafter, examples of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. The following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention.

  Note that each functional block described in the present embodiment is not necessarily separate hardware. That is, for example, the functions of some functional blocks may be executed by one piece of hardware. In addition, the function of one functional block or the functions of a plurality of functional blocks may be executed by some hardware linked operations.

In the case where the entire drive region is the correction range In this embodiment, a liquid crystal projector will be described. As a liquid crystal projector, a single-plate type, a three-plate type, and the like are generally known, but either type may be used. The liquid crystal projector of the present embodiment controls the light transmittance of the liquid crystal element according to the image to be displayed, and projects the light from the light source that has passed through the liquid crystal element onto the projection surface, so that the image is displayed to the user. Present.

  Hereinafter, such a liquid crystal projector will be described.

<Overall configuration>
First, the overall configuration of the liquid crystal projector of this embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an overall configuration of a liquid crystal projector 100 of the present embodiment.

  The liquid crystal projector 100 according to the present embodiment includes a CPU 110, a ROM 111, a RAM 112, an operation unit 113, an image input unit 130, and an image processing unit 140. The liquid crystal projector 100 further includes a liquid crystal control unit 150, liquid crystal elements 151R, 151G, and 151B, a light source control unit 160, a light source 161, a color separation unit 162, a color composition unit 163, an optical system control unit 170, and a projection optical system 171. Have The liquid crystal projector 100 may further include a recording / playback unit 191, a recording medium 192, a communication unit 193, a display control unit 195, and a display unit 196.

  The CPU 110 controls each operation block of the liquid crystal projector 100, the ROM 111 stores a control program describing the processing procedure of the CUP 110, and the RAM 112 temporarily stores a control program as a work memory. Stores data. In addition, the CPU 110 temporarily stores still image data and moving image data reproduced from the recording medium 192 by the recording / reproducing unit 191, and reproduces each image and video using a program stored in the ROM 111. You can also. In addition, the CPU 110 can temporarily store still image data and moving image data received from the communication unit 193, and can reproduce each image or video using a program stored in the ROM 111.

  The operation unit 113 receives a user instruction and transmits an instruction signal to the CPU 110, and includes, for example, a switch, a dial, a touch panel provided on the display unit 196, and the like. For example, the operation unit 113 may be a signal receiving unit (such as an infrared receiving unit) that receives a signal from a remote controller and transmits a predetermined instruction signal to the CPU 110 based on the received signal. The CPU 110 receives control signals input from the operation unit 113 and the communication unit 193 and controls each operation block of the liquid crystal projector 100.

  The image input unit 130 receives a video signal from an external device, and includes, for example, a composite terminal, an S video terminal, a D terminal, a component terminal, an analog RGB terminal, a DVI-I terminal, a DVI-D terminal, and HDMI (registered). Trademark), DisplayPort terminal, and the like. When an analog video signal is received, the received analog video signal is converted into a digital video signal. Then, the received video signal is transmitted to the image processing unit 140. Here, the external device may be any device such as a personal computer, a camera, a mobile phone, a smartphone, a hard disk recorder, or a game machine as long as it can output a video signal.

  The image processing unit 140 performs processing for changing the number of frames, the number of pixels, the image shape, and the like on the video signal received from the video input unit 130, and transmits the video signal to the liquid crystal control unit 150. For example, a microprocessor for image processing Consists of. Further, the image processing unit 140 does not need to be a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the image processing unit 140 by a program stored in the ROM 111. The image processing unit 140 can execute functions such as frame thinning processing, frame interpolation processing, resolution conversion processing, and distortion correction processing (keystone correction processing). In addition to the video signal received from the video input unit 130, the image processing unit 140 can perform the above-described change processing on the image or video reproduced by the CPU 110.

  The liquid crystal control unit 150 controls the voltage applied to the liquid crystal of the pixels of the liquid crystal elements 151R, 151G, and 151B based on the video signal processed by the image processing unit 140, and the liquid crystal elements 151R, 151G, and 151B. It adjusts the transmittance and consists of a control microprocessor. Further, the liquid crystal control unit 150 does not need to be a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the liquid crystal control unit 150 by a program stored in the ROM 111. For example, when a video signal is input to the image processing unit 140, the liquid crystal control unit 150 causes the liquid crystal element to have a transmittance corresponding to the image every time an image of one frame is received from the image processing unit 140. 151R, 151G, and 151B are controlled.

  The liquid crystal element 151 </ b> R is a liquid crystal element corresponding to red, and out of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, the red light transmittance is adjusted. The liquid crystal element 151 </ b> G is a liquid crystal element corresponding to green, and out of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, it is for adjusting the transmittance of green light. The liquid crystal element 151 </ b> B is a liquid crystal element corresponding to blue, and of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, it is for adjusting the transmittance of blue light.

  Specific control operations of the liquid crystal elements 151R, 151G, and 151B by the liquid crystal control unit 150 and the configurations of the liquid crystal elements 151R, 151G, and 151B will be described later.

  The light source control unit 160 controls on / off of the light source 161 and controls the amount of light, and includes a control microprocessor. Further, the light source control unit 160 does not need to be a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the light source control unit 160 by a program stored in the ROM 111.

  The light source 161 outputs light for projecting an image on a projection surface (not shown), and may be, for example, a halogen lamp, a xenon lamp, a high-pressure mercury lamp, or the like. The color separation unit 162 separates light output from the light source 161 into red (R), green (G), and blue (B), and includes, for example, a dichroic mirror or a prism. In addition, when using LED etc. corresponding to each color as the light source 161, the color separation part 162 is unnecessary.

  The color synthesis unit 163 synthesizes red (R), green (G), and blue (B) light transmitted through the liquid crystal elements 151R, 151G, and 151B, and includes, for example, a dichroic mirror or a prism. . Then, light obtained by combining the red (R), green (G), and blue (B) components by the color combining unit 163 is sent to the projection optical system 171. At this time, the liquid crystal elements 151 </ b> R, 151 </ b> G, and 151 </ b> B are controlled by the liquid crystal control unit 150 so as to have a light transmittance corresponding to the image input from the image processing unit 140. Therefore, when the light synthesized by the color synthesizing unit 163 is projected onto the projection plane by the projection optical system 171, an image corresponding to the image input by the image processing unit 140 is displayed on the projection plane. .

  The optical system control unit 170 controls the projection optical system 171 and includes a control microprocessor. The optical system control unit 170 does not have to be a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the optical system control unit 170 by a program stored in the ROM 111. The projection optical system 171 is for projecting the synthesized light output from the color synthesizing unit 163 onto the projection surface. The projection optical system 171 includes a plurality of lenses and lens driving actuators. The lenses are driven by the actuators. The display position can be adjusted by enlarging or reducing the projected image, adjusting the focus, or shifting the lens.

  The recording / reproducing unit 191 reproduces still image data and moving image data from the recording medium 192. Still image data and moving image data received from the communication unit 193 may be recorded on the recording medium 192. The recording / reproducing unit 191 includes, for example, an interface electrically connected to the recording medium 192 and a microprocessor for communicating with the recording medium 192. The recording / reproducing unit 191 does not need to include a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the recording / reproducing unit 191 by a program stored in the ROM 111. The recording medium 192 can record still image data, moving image data, and other control data necessary for the liquid crystal projector of this embodiment, and can be used for any kind of magnetic disk, optical disk, semiconductor memory, etc. It may be a recording medium of a system, and may be a removable recording medium or a built-in recording medium.

  The communication unit 193 is for receiving control signals, still image data, moving image data, and the like from an external device. For example, the communication unit 193 may be a wireless LAN, a wired LAN, USB, Bluetooth (registered trademark), or the like. The method is not particularly limited. Further, if the terminal of the image input unit 130 is, for example, an HDMI (registered trademark) terminal, CEC communication may be performed via the terminal. Here, the external device may be any device such as a personal computer, a camera, a mobile phone, a smartphone, a hard disk recorder, a game machine, or a remote controller as long as it can communicate with the liquid crystal projector 100. .

  The display control unit 195 controls the display unit 196 provided in the liquid crystal projector 100 to display an image such as an operation screen or a switch icon for operating the liquid crystal projector 100, and is a micro that performs display control. It consists of a processor. Further, the microprocessor need not be a microprocessor dedicated to the display control unit 195. For example, the CPU 110 may execute the same processing as the display control unit 195 by a program stored in the ROM 111. The display unit 196 displays an operation screen and switch icons for operating the liquid crystal projector 100. The display unit 196 may be anything as long as it can display an image. For example, it may be a liquid crystal display, a CRT display, an organic EL display, or an LED display. Further, in order to post a specific button so that the user can recognize it, an LED or the like corresponding to each button may be made to emit light.

  Note that the image processing unit 140, the liquid crystal control unit 150, the light source control unit 160, the optical system control unit 170, the recording / playback unit 191 and the display control unit 195 of the present embodiment perform the same processing as those of these blocks. There may be one or more possible microprocessors. Alternatively, for example, the CPU 110 may execute the same processing as each block by a program stored in the ROM 111.

<Basic operation>
Next, the basic operation of the liquid crystal projector 100 of this embodiment will be described with reference to FIGS.

  FIG. 2 is a flowchart for explaining the control of the basic operation of the liquid crystal projector 100 of the present embodiment. The operation of FIG. 2 is basically executed by the CPU 110 controlling each functional block based on a program stored in the ROM 111. The flowchart in FIG. 2 starts when the user instructs the liquid crystal projector 100 to be turned on by the operation unit 113 or a remote controller (not shown).

  When the user instructs the liquid crystal projector 100 to be turned on using the operation unit 113 or a remote controller (not shown), the CPU 110 supplies power from a power supply circuit (not shown) to each part of the liquid crystal projector 100 from a power supply unit (not shown).

  Next, the CPU 110 determines the display mode selected by the operation of the operation unit 113 or the remote controller by the user (S210). One of the display modes of the liquid crystal projector 100 of the present embodiment is an “input image display mode” in which a video input from the image input unit 130 is displayed. In addition, one of the display modes of the liquid crystal projector 100 according to the present embodiment is a “file playback display mode” for displaying still image data or moving image data or video read from the recording medium 192 by the recording / playback unit 191. is there. In addition, one of the display modes of the liquid crystal projector 100 according to the present embodiment is a “file reception display mode” in which an image or video of still image data or moving image data received from the communication unit 193 is displayed. In the present embodiment, the case where the display mode is selected by the user will be described. However, the display mode at the time of turning on the power may be the display mode at the end of the previous time. These display modes may be set as the default display mode. In that case, the process of S210 can be omitted. Here, it is assumed that “input image display mode” is selected in S210.

  When “input image display mode” is selected, the CPU 110 determines whether or not a video is input from the image input unit 130 (S220). If it is not input (No in S220), the control unit waits until an input is detected. If it is input (Yes in S220), the control unit executes a projection process (S230).

  As the projection processing, the CPU 110 transmits the video input from the image input unit 130 to the image processing unit 140, and causes the image processing unit 140 to perform modification of the number of pixels, the frame rate, and the shape of the video, and the processing is performed. The image for one screen is transmitted to the liquid crystal control unit 150. Then, the CPU 110 causes the liquid crystal control unit 150 to have a transmittance corresponding to the gradation level of each color component of red (R), green (G), and blue (B) of the received image for one screen. The transmittance of the liquid crystal elements 151R, 151G, and 151B is controlled. Then, the CPU 110 causes the light source control unit 160 to control the output of light from the light source 161. The color separation unit 162 separates light output from the light source 161 into red (R), green (G), and blue (B), and supplies each light to the liquid crystal elements 151R, 151G, and 151B. The amount of light of each color supplied to the liquid crystal elements 151R, 151G, and 151B is limited for each pixel of each liquid crystal element. Then, the red (R), green (G), and blue (B) lights transmitted through the liquid crystal elements 151R, 151G, and 151B are supplied to the color synthesis unit 163 and synthesized again. The light combined by the color combining unit 163 is projected onto a projection surface (not shown) via the projection optical system 171. This projection processing is sequentially executed for each image of one frame while the image is projected.

  At this time, if an instruction to operate the projection optical system 171 is input from the instruction unit 111 by the user, the CPU 110 changes the focus of the projection image or enlarges the optical system to the optical system control unit 170. The actuator of the projection optical system 171 is controlled so as to change.

  During execution of the display process, the CPU 110 determines whether or not an instruction to switch the display mode is input from the instruction unit 111 (S240). Here, when an instruction to switch the display mode is input from the instruction unit 111 by the user (Yes in S240), the CPU 110 returns to S210 again and determines the display mode. At this time, the CPU 110 transmits a menu screen for selecting the display mode to the image processing unit 140 as an OSD image, and controls the image processing unit 140 to superimpose the OSD screen on the image being projected. To do. The user selects a display mode while viewing the projected OSD screen.

  On the other hand, if an instruction to switch the display mode is not input from the instruction unit 111 by the user during display processing (No in S240), the CPU 110 determines whether or not an instruction to end projection is input from the instruction unit 111 by the user. Determination is made (S250). Here, when an instruction to end projection is input from the instruction unit 111 by the user (Yes in S250), the CPU 110 stops the power supply to each block of the liquid crystal projector 100 and ends the image projection. On the other hand, when an instruction to end projection is input from the instruction unit 111 by the user (No in S250), the CPU 110 returns to S220, and thereafter, until an instruction to end projection is input from the instruction unit 111 by the user. The process from S220 to S250 is repeated.

  As described above, the liquid crystal projector 100 according to the present embodiment projects an image on the projection surface.

  In the “file playback display mode”, the CPU 110 causes the recording / playback unit 191 to read a file list of still image data and moving image data and thumbnail data of each file from the recording medium 192 and temporarily store them in the RAM 112. . The CPU 110 generates a character image based on the file list temporarily stored in the RAM 112 and an image based on the thumbnail data of each file based on the program stored in the ROM 111, and transmits the image to the image processing unit 140. Then, the CPU 110 controls the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S230).

  Next, on the projection screen, an instruction to select characters and images respectively corresponding to still image data and moving image data recorded on the recording medium 192 is input through the instruction unit 111. Then, the CPU 110 controls the recording / reproducing unit 191 so as to read out selected still image data and moving image data from the recording medium 192. The CPU 110 temporarily stores the read still image data and moving image data in the RAM 112, and reproduces the image and video of the still image data and moving image data based on the program stored in the ROM 111.

  Then, for example, the CPU 110 sequentially transmits the reproduced moving image data to the image processing unit 140, and controls the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S230). To do. When the still image data is reproduced, the reproduced image is transmitted to the image processing unit 140, and the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 are transmitted in the same manner as the normal projection processing (S230). Control.

  In the “file reception display mode”, the CPU 110 temporarily stores still image data and moving image data received from the communication unit 193 in the RAM 112, and stores the still image data and moving image data based on the program stored in the ROM 111. Play back images and videos. Then, for example, the CPU 110 sequentially transmits the reproduced moving image data to the image processing unit 140, and controls the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S230). To do. When the still image data is reproduced, the reproduced image is transmitted to the image processing unit 140, and the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 are transmitted in the same manner as the normal projection processing (S230). Control.

  Next, a characteristic configuration / operation of the present embodiment will be described with reference to FIGS. 4, 5, 6, 7, and 11.

  FIG. 4 is a diagram showing a method for controlling the drawing position of the video signal drawn on the liquid crystal element 151. FIG. 5 is a diagram illustrating a configuration of a characteristic part of the liquid crystal projector 100. FIG. 6 is a diagram showing the relationship between the video signal input to the liquid crystal element 151 and the projected image. FIG. 7 is a flowchart showing the characteristics of the operation of the liquid crystal projector 100. FIG. 11 is a diagram showing a configuration when performing multi-projection with two liquid crystal projectors 100 and 200.

In this embodiment, the movement of the liquid crystal projector 100 shown in FIG. 11 will be described. It is assumed that the liquid crystal projector 200 moves in the same manner as the liquid crystal projector 100.
First, a method for controlling the drawing position of a video signal drawn on the liquid crystal element 151 will be described with reference to FIG. In this figure, the drawing position in the vertical direction is controlled, but the same control is possible even in the horizontal direction.

  As described in FIGS. 4A and 4B, the effective image area 30 is output at a constant timing with reference to the reference synchronization signal. On the other hand, a signal serving as a cue to start drawing of the liquid crystal element 151 is a panel drawing start signal. By shifting the phase of the panel drawing start signal from the reference synchronization signal, the position of the video signal drawn on the liquid crystal element 151 is shifted. This makes it possible to control the drawing position of the video signal on the liquid crystal element 151.

  Next, a characteristic configuration will be described with reference to FIG. This figure shows a state in which the liquid crystal element 151R is connected. However, the liquid crystal elements 151G and 151B have the same connection form, and hence the description thereof is omitted below.

The image processing unit 140 performs predetermined processing on the input video signal and outputs it to the liquid crystal driving unit 154. At the time of this process, a correction value to be used for the correction process for the video data signal from the ROM 111 is referred to as necessary, and a process for temporarily storing the video signal in the RAM 112 is performed.
The liquid crystal driving unit 154 outputs an electric signal for driving the liquid crystal element 151R to the liquid crystal element 151R in accordance with the video signal received from the image processing unit 140.

  The synchronization signal generation unit 155 generates a reference synchronization signal of the video signal, and outputs it to the image processing unit 140 and the panel drawing start signal generation unit 153.

  The CPU 110 outputs a signal for controlling the drawing position of the video signal on the liquid crystal element 151 </ b> R to the panel drawing start signal generation unit 153 in accordance with a control signal input from the operation unit 113 or the communication unit 193.

  The panel drawing start signal generation unit 153 starts panel drawing with a predetermined phase in response to a reference synchronization signal received from the synchronization signal generation unit 155 and a control request for a drawing position of a video signal drawn on the liquid crystal element 151R received from the CPU 110. Generate a signal. The generated panel drawing start signal is sent to the liquid crystal element 151R.

  The liquid crystal element 151R starts driving in response to the panel drawing start signal, and drives the liquid crystal of each pixel in accordance with the signal received from the liquid crystal driving unit 154.

  Next, the flow of processing will be described using the flowchart of FIG.

  In S <b> 701, the CPU 110 detects the split display information of the liquid crystal projector 100 from the operation unit 113 or the communication unit 193. Here, the divided display information is information including a multi-projection configuration (the number of projectors and their arrangement) and a display area in charge of the projector in a multi-projection setting. In the example of the liquid crystal projector 100 of FIG. 11, it is only necessary to know that the number is two, the arrangement is 2 × 1 in the horizontal direction, and the charge is on the lower side of the whole.

  In S702, the CPU 110 outputs a control request for the drawing position of the video signal drawn on the liquid crystal element 151R to the panel drawing start signal generation unit 153 in accordance with the divided display information detected in S701. Specifically, the effective image area 30 is located on the opposite side (upper side in the example of FIG. 6) of the display area handled by the liquid crystal projector 100 detected in S701 in the drive area 20 projected by the liquid crystal projector 100. Make a request to start drawing to touch.

  In step S703, the panel drawing start signal generation unit 153 outputs a panel drawing start signal having a predetermined phase to the liquid crystal element 151R in response to the control request from the CPU 110 and the reference synchronization signal from the synchronization signal generation unit 155.

  In S704, the liquid crystal element 151R draws a video signal based on the panel drawing start signal.

  As described above, according to the liquid crystal projector 100 of the first embodiment, the CPU 110 detects the setting information related to multi-projection, and the panel drawing start signal generated in response thereto is effective for the drive region 20 of the liquid crystal element 151. The drawing position of the image area 30 is determined.

  In the conventional example, as shown in FIG. 6C-1, the drawing position of the effective image area 30 with respect to the drive area 20 is determined regardless of the multi-projection setting. For this reason, as shown in FIG. 6C-2, when the projection images projected by the respective liquid crystal projectors are aligned with each other in order to perform multi-projection, the region shown in the projection light superimposing region 40 and other regions A brightness difference has occurred between the areas. In order to prevent this, in the present invention, as shown in FIG. 6 (d) -1, the drawing position of the effective image area 30 with respect to the drive area 20 of the liquid crystal element 151R is determined in consideration of the setting of multi-projection. For this reason, the liquid crystal projector 100 of the present embodiment does not have a projection light overlapping region even when the edges of the projected images projected by the respective liquid crystal projectors are aligned during multi-projection, and there is a difference in luminance on the projection surface. Does not occur (FIG. 6 (d) -2).

  In the second embodiment, a case where the image processing unit 140 performs distortion correction will be described. In addition, a different part from Example 1 is demonstrated.

  First, distortion correction will be described. The liquid crystal projector may not be placed in front of the screen due to restrictions on the installation location. In this case, geometric distortion called trapezoidal distortion occurs on the screen due to the relative inclination between the liquid crystal projector main body and the screen. Distortion correction is performed using a trapezoid correction function for correcting this trapezoid distortion by signal processing.

The configuration and operation that characterize the second embodiment will be described below with reference to FIGS. FIG. 8 is a diagram illustrating the relationship between the video signal input to the liquid crystal element 151 and the projection image in the second embodiment. FIG. 9 is a flowchart showing the characteristics of the operation of the liquid crystal projector 100 according to the second embodiment.
FIG. 5 is a diagram illustrating a configuration of a characteristic part of the liquid crystal projector 100. The details are described in the first embodiment, and therefore the description is omitted here.

  First, the flow of processing will be described using the flowchart of FIG.

  Since the operation of each unit in S901 to S904 is the same as that in S701 to S704, description thereof is omitted here.

  In step S905, the image processing unit 140 performs distortion correction control according to the divided display information detected by the CPU 110 in step S901. In the effective image area 30 after distortion correction, an area without a video signal is formed (FIG. 8 (e) -1). For this reason, the image processing unit 140 displays the image after distortion correction on the side (the upper side in the example of FIG. 8) where the drive region 20 projected by the liquid crystal projector 100 contacts the drive region 20 projected by another liquid crystal projector 200. An offset is applied to the position of the distortion corrected image within the effective image area 30 so as to be in contact (FIG. 8 (f) -1).

  Note that the position of the distortion correction image is not limited to the offset, and four-point designation type distortion correction may be used.

  As described above, according to the liquid crystal projector 100 of the second embodiment, the image processing unit 140 receives the multi-setting information from the CPU 110 and considers the drawing position of the corrected image after correcting the distortion of the liquid crystal element 151. . As a result, even when the edges of the projected images projected by the respective liquid crystal projectors are aligned with each other with distortion correction during multi-projection, there is no projection light overlapping area and a luminance difference occurs on the projection plane. do not do.

100 liquid crystal projector, 101 projection area of the liquid crystal projector 100,
110 CPU, 111 ROM, 112 RAM, 113 operation unit,
140 image processing unit, 150 liquid crystal control unit, 151 liquid crystal elements R, G, B,
152 phase control unit, 153 panel drawing start signal generation unit, 154 liquid crystal drive unit,
155 Vertical synchronization signal generation unit, 193 communication unit

Claims (4)

A panel capable of controlling a display area larger than an effective image that can be displayed by the projection apparatus;
A detection unit for detecting divided area information displayed by the projection apparatus in divided display from an external input;
A panel display control unit for determining a display position of an effective image within a display area controlled by the panel;
A projection apparatus, wherein the panel display control unit determines a display position of an effective image according to divided area information detected by the detection unit. The distortion correction unit for correcting distortion of a projection image projected by the projection device, and the distortion correction unit corrects distortion according to a detection result of the detection unit. The projection device described. The divided area information detected by the detection unit includes information on the number and arrangement of the plurality of projection apparatuses in a multi-projection system that forms one screen using a plurality of the projection apparatuses. The projection apparatus according to claim 1, further comprising information on an arrangement of the own apparatus among the projection apparatuses. The projection apparatus according to claim 1, wherein the external input for the detection unit to detect the divided region information is an input by a manual operation on the projection apparatus.