JP2017079409A - Display, control method of display, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to eliminate color shift without restricting the amount of alignment adjustment of an optical modulation panel set to an update area that is smaller than a panel driving area.SOLUTION: A liquid crystal panel 151 forms an image for projection by pixels being driven by a liquid crystal control part 150. In adjusting the relative position of an update area to a panel drive area to adjust a display position of an image projected on a screen, when the amount of adjustment of the relative position exceeds a predetermined amount, a CPU 111 performs adjustment of the relative position divisively with a small adjustment amount smaller than the predetermined amount until the amount of adjustment is reached.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device that displays video and the like, a control method for the display device, and a program.

In recent years, as an example of a display device, a three-plate type projection device that synthesizes and projects three primary color lights of red, green, and blue (hereinafter referred to as R, G, and B) has become widespread. The three-plate type projector has three light modulation panels corresponding to the three primary color lights of R, G, and B. Each light modulation panel is composed of, for example, a liquid crystal panel, and modulates incident light for each pixel (dot) based on an image signal. Then, the projection device combines the light modulated by the respective light modulation panels with a combining optical system, and projects the combined light onto a screen or the like via the projection optical system. Here, when the three light modulation panels, the combining optical system, and the like are deviated from a predetermined arrangement position, the display image projected on the screen is an image in which color misregistration occurs. The positional deviation of the light modulation panel or the like is caused by, for example, the light modulation panel or the like fixed in the projection apparatus being displaced due to vibration or the like in the course of use.
Patent Document 1 discloses a liquid crystal display device that reduces color misregistration by performing alignment adjustment that electrically corrects positional misalignment of three liquid crystal panels corresponding to R, G, and B individually. . The liquid crystal display device of Patent Document 1 has three liquid crystal panels provided with a display matrix region that is larger by a predetermined number of pixels than the outer periphery of a display region where an image is displayed. In the liquid crystal display device, when alignment adjustment is performed, an image displayed in the display area of each liquid crystal panel is displayed in the display matrix area so that the positions of the projected images of R, G, and B colors coincide on the screen. Control is performed so as to shift in units of one pixel within the range.

JP-A-5-143026

  By the way, the display device may use an area that is narrower than the panel drive area of the light modulation panel as an update area depending on usage conditions and set an effective display area in the update area. In such area setting, for example, when the alignment adjustment is performed by applying the technique of Patent Document 1, an update area other than the effective display area is set as a black area. On the other hand, non-update areas other than the update area in the panel drive area are areas where the display is not updated. For this reason, when the adjustment amount at the time of alignment adjustment exceeds the range of the black region, an image remaining in the non-update region may be visually recognized by the user. On the other hand, in order to prevent the image in the non-updated region from being seen by the user, for example, if the adjustment amount at the time of alignment adjustment is reduced, the alignment adjustment becomes insufficient and color misregistration remains. .

  Therefore, the present invention provides a display device, a display method, and a program capable of eliminating color misregistration without limiting the adjustment amount of alignment adjustment of the light modulation panel set in the update region narrower than the panel drive region. The purpose is to do.

  The display device of the present invention has a panel surface on which a plurality of pixels are two-dimensionally arranged, and each pixel is driven by a driving unit to form an image for projection on a screen on the panel surface. Means for driving each pixel in the update area narrower than the drive area of the panel surface of the forming means to update the image on the panel surface, and adjusting the relative position of the update area with respect to the drive area Adjusting means for adjusting the display position of the image projected on the screen, and the adjusting means, when adjusting the relative position, if the adjustment amount of the relative position exceeds a predetermined amount, The relative position is adjusted in a divided manner with a small adjustment amount smaller than the predetermined amount until the adjustment amount is reached.

  According to the present invention, it is possible to eliminate color misregistration without limiting the adjustment amount of the alignment adjustment of the light modulation panel set in the update region narrower than the panel drive region.

It is a figure which shows the structural example of the whole liquid crystal projector. It is a flowchart of the basic operation | movement of the liquid-crystal projector of this embodiment. It is a figure which shows the internal structural example of an image process part and a liquid-crystal control part. It is explanatory drawing of the relationship between an update area | region and a panel drive area | region. It is explanatory drawing of adjustment when a panel drive area | region and an update area | region are equal. It is explanatory drawing of adjustment when an update area | region is smaller than a panel drive area | region. It is explanatory drawing of the example with which the image of a non-update area | region is visually recognized. It is a flowchart of alignment adjustment in an embodiment. It is a flowchart of adjustment amount control in a 1st embodiment. It is explanatory drawing of the alignment adjustment in 1st Embodiment. It is a flowchart of the adjustment control by the update area expansion of 2nd Embodiment. It is a flowchart of the black area calculation in the case of the third embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
<Overall configuration>
FIG. 1 is a diagram illustrating an overall configuration of a liquid crystal projector 100 which is an example of a display device according to 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. Further, the liquid crystal projector 100 includes a liquid crystal control unit 150, liquid crystal panels 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. . The liquid crystal projector 100 may include a recording / playback unit 191, a recording medium 192, a communication unit 193, an imaging unit 194, a display control unit 195, and a display unit 196.

  CPU 110 controls each block of liquid crystal projector 100. The ROM 111 stores a control program that describes the processing procedure of the CPU 110. The RAM 112 temporarily stores control programs and data as work memory. The CPU 110 reads still image data and moving image data from the recording medium 192 via the recording / playback unit 191 and temporarily stores the data in the RAM 112. Further, the CPU 110 temporarily stores the still image and moving image data received via the communication unit 193 in the RAM 112. In addition, the CPU 110 temporarily stores still image data and moving image data captured by the imaging unit 194 in the RAM 112. The CPU 110 executes a program stored in the ROM 111 to convert still image data or moving image data temporarily stored in the RAM 112 into data for recording, and stores it in the recording medium 192 via the recording / playback unit 191. It can also be recorded. Further, the CPU 110 executes a program stored in the ROM 111 to convert still image data and moving image data temporarily stored in the RAM 112 into display data, and displays the display unit via the display control unit 195. It can also be displayed on 196.

  The operation unit 113 receives an instruction from the user and transmits an instruction signal to the CPU 110. The operation unit 113 includes, for example, a switch, a dial, a touch panel provided on the display unit 196, and the like. CPU 110 controls each block of liquid crystal projector 100 based on an instruction signal input from operation unit 113. The operation unit 113 may be, for example, a remote controller (hereinafter referred to as a remote controller) that transmits a signal using infrared rays. When infrared communication is performed, the operation unit 113 transmits an infrared instruction signal from the infrared transmission unit in response to an instruction from the user. The communication unit 193 at this time includes a signal receiving unit (infrared receiving unit) that receives a signal transmitted from the operation unit 113 by infrared rays, and sends the received signal to the CPU 110. At this time, the CPU 110 controls each block of the liquid crystal projector 100 based on the signal received by the communication unit 193.

  The image input unit 130 is an interface unit for receiving a video signal transmitted from an external device (not shown). The image input unit 130 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, an HDMI (registered trademark) terminal, and the like. In addition, when receiving an analog video signal, the image input unit 130 converts the received analog video signal into a digital video signal. Then, the image input unit 130 sends the received video signal 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 generates each frame image obtained by subjecting the video signal received from the image input unit 130 to a frame number changing process, a pixel number changing process, an image shape changing process, and the like. 150. The image processing unit 140 can also perform processing such as frame thinning processing, frame interpolation processing, resolution conversion processing, and distortion correction processing (keystone correction processing). The image processing unit 140 also processes still images and moving images read from the recording medium 192, still images and moving images received via the communication unit 193, and still image and moving image data captured by the imaging unit 194. Thus, the above-described change process can be performed. The image processing unit 140 is composed of, for example, a microprocessor for image processing. Note that the image processing unit 140 does not need to be provided as a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the image processing unit 140 based on a program stored in the ROM 111.

  The light source control unit 160 controls the on / off of the light source 161 and the amount of light, and includes a control microprocessor. The light source control unit 160 does not need to be provided as a dedicated microprocessor. For example, the CPU 110 may execute the same control as the light source control unit 160 based on a program stored in the ROM 111. The light source 161 generates light for projecting an image on a screen (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 from the light source 161 into light of three primary colors of red, green, and blue (hereinafter referred to as R, G, and B). For example, from the dichroic mirror and the prism Become. In addition, when using LED etc. corresponding to each color of R, G, B as the light source 161, the color separation part 162 is unnecessary. The light of each color of R, G, and B separated from the light of the light source 161 by the color separation unit 162 is incident on the liquid crystal panels 151R, 151G, and 151B provided corresponding to the colors of R, G, and B.

  The liquid crystal panels 151R, 151G, and 151B are an example of a forming unit that forms an image on the panel surface. Based on a drive signal supplied from the liquid crystal control unit 150, the amount of incident light transmitted for each pixel (dot) is reduced. Change. The liquid crystal panels 151R, 151G, and 151B are examples of light modulation panels that perform light modulation for each pixel with respect to incident light of R, G, and B colors. In this embodiment, the light modulation panel is a transmissive panel, but may be a reflective panel. The liquid crystal panel 151 </ b> R is a liquid crystal panel provided corresponding to the R light among the light separated into R, G, and B colors by the color separation unit 162. The liquid crystal panel 151R is configured by two-dimensionally arranging a plurality of pixels, and adjusts the transmission amount of R light for each pixel based on an image signal. Thereby, an image for projection of only the R color is formed on the panel surface of the liquid crystal panel 151R. The liquid crystal panel 151 </ b> G is a liquid crystal panel provided corresponding to the G light among the lights separated into the R, G, and B colors by the color separation unit 162. The liquid crystal panel 151G is configured by two-dimensionally arranging a plurality of pixels, and adjusts the transmission amount of G light for each pixel based on an image signal. As a result, an image for projection of only G color is formed on the panel surface of the liquid crystal panel 151G. The liquid crystal panel 151 </ b> B is a liquid crystal panel provided corresponding to the B light among the lights separated into the R, G, and B colors by the color separation unit 162. The liquid crystal panel 151B is configured by two-dimensionally arranging a plurality of pixels, and adjusts the transmission amount of B light for each pixel based on an image signal. Thereby, an image for projection of only the B color is formed on the panel surface of the liquid crystal panel 151B. Hereinafter, when the liquid crystal panels 151R, 151G, and 151B are described without being distinguished from each other, they will be referred to as “liquid crystal panels 151”.

  The liquid crystal control unit 150 generates a drive signal for adjusting the light transmittance in each pixel of the liquid crystal panels 151R, 151G, and 151B based on the image signal of each frame processed by the image processing unit 140. Specifically, the drive signal generated by the liquid crystal control unit 150 is a signal that controls the voltage applied to the liquid crystal of each pixel of the liquid crystal panels 151R, 151G, and 151B. The liquid crystal control unit 150 applies voltages to be applied to the pixels of the liquid crystal panels 151R, 151G, and 151B according to the gradation levels of the R, G, and B color components of each frame image sent from the image processing unit 140. By controlling, the light transmittance of each pixel is adjusted. The liquid crystal control unit 150 is configured by a control microprocessor, for example. The liquid crystal control unit 150 does not need to be provided as a dedicated microprocessor. For example, the CPU 110 may execute the same control as the liquid crystal control unit 150 based on a program stored in the ROM 111.

  The optical system control unit 170 controls the projection optical system 171 and includes, for example, a control microprocessor. The optical system control unit 170 does not need to be provided as a dedicated microprocessor. For example, the CPU 110 may execute the same control as the optical system control unit 170 based on a program stored in the ROM 111. The color synthesizing unit 163 synthesizes R, G, and B lights respectively transmitted through the liquid crystal panels 151R, 151G, and 151B, and includes, for example, a dichroic mirror and a prism. The light obtained by combining the R, G, and B lights by the color combining unit 163 enters the projection optical system 171. The projection optical system 171 is an optical system for forming a projected image by the light combined by the color combining unit 163 on the screen. The projection optical system 171 includes a plurality of lenses and lens driving actuators, and by driving the lenses with the actuators, the projection image can be enlarged, reduced, focused, lens shifted, and the like. In this embodiment, the liquid crystal panels 151R, 151G, and 151B adjust the transmittance of each pixel based on each frame image from the image processing unit 140, and the color composition unit 163 performs R through the liquid crystal panels 151R, 151G, and 151B. , G, and B are combined. Since the light synthesized by the color synthesis unit 163 is projected onto the screen by the projection optical system 171, videos corresponding to the frame images from the image processing unit 140 are sequentially projected and displayed on the screen. .

  The recording / playback unit 191 plays back still image data and moving image data from the recording medium 192. The recording / playback unit 191 records still image data and moving image data obtained by the imaging unit 194 on the recording medium 192. The recording / playback unit 191 can also record still image data and moving image data received from the communication unit 193 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. Note that 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 based on a program stored in the ROM 111. The recording medium 192 can record still image data, moving image data, control data necessary for the liquid crystal projector of this embodiment, and the like. The recording medium 192 may be any type of recording medium such as a magnetic disk, an optical disk, or a semiconductor memory, and may be a detachable recording medium or a built-in recording medium.

  The communication unit 193 receives control signals, still image data, moving image data, and the like from an external device. The communication unit 193 may be compliant with, for example, a wireless LAN, a wired LAN, USB, Bluetooth (registered trademark), and is not limited to a specific communication method. When the terminal of the image input unit 130 is, for example, an HDMI (registered trademark) terminal, the communication unit 193 may perform CEC communication via the terminal. 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 imaging unit 194 captures an image of the periphery of the liquid crystal projector 100 according to the present embodiment and acquires an image. For example, the imaging unit 194 captures an image projected on the screen via the projection optical system 171 (captures the screen direction). be able to. The imaging unit 194 includes a lens that forms an optical image of a subject on the imaging surface of the imaging device, an actuator that drives the lens, a microprocessor that controls the actuator, and an imaging that converts the optical image formed on the imaging surface into an image signal. Including elements. The imaging unit 194 also includes an AD conversion unit that converts an analog image signal obtained by the imaging element into digital data. The imaging unit 194 sends the obtained image data to the CPU 110, and the CPU 110 temporarily stores the image data from the imaging unit 194 in the RAM 112. Then, the CPU 110 executes the program stored in the ROM 111 to convert the image data temporarily stored in the RAM 112 into still image data or moving image data handled by the liquid crystal projector 100. Note that the imaging unit 194 is not limited to capturing the screen direction, and may capture the viewer side in the opposite direction to the screen, for example.

  The display control unit 195 performs control for causing the display unit 196 to display an image such as an operation screen for operating the liquid crystal projector 100 and a switch icon, and includes a microprocessor that performs display control. The display control unit 195 does not need to be provided as a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the display control unit 195 based on a program stored in the ROM 111. The display unit 196 displays an operation screen and a switch icon for operating the liquid crystal projector 100 under the control of the display control unit 195. 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. In addition, the display unit 196 may emit an LED or the like corresponding to each button in order to post a specific button so that the user can recognize it.

  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. Or for example, based on the program memorize | stored in ROM111, CPU110 may perform the process similar to each block.

<Basic operation>
FIG. 2 is a flowchart for explaining the basic operation of the liquid crystal projector 100 of the present embodiment. The operation of the flowchart shown in FIG. 2 is basically executed by the CPU 110 controlling each block based on a program stored in the ROM 111. The processing of the flowchart of FIG. 2 is started 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 by the operation unit 113 or a remote controller (not shown), the CPU 110 supplies power to each unit of the liquid crystal projector 100 from a power supply circuit of the 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 as the process of step S210. Hereinafter, step S210 is denoted as S210, and is similarly denoted in the subsequent steps. Here, the liquid crystal projector 100 in the present embodiment has, for example, three display modes. The first display mode is an “input image display mode” in which a video input from the image input unit 130 is displayed. The second display mode is a “file playback display mode” in which a still image or a moving image read from the recording medium 192 by the recording / playback unit 191 is displayed. The third display mode is a “file reception display mode” in which still images and moving images received by the communication unit 193 are 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 when the power is turned on may be the display mode at the end of the previous time, or any of the above-described ones. The display mode may be the default display mode. In that case, the process of S210 can be omitted. Here, description will be made assuming that “input image display mode” is selected in S210.

  When the “input image display mode” is selected in S210, the CPU 110 determines whether or not a video is input from the image input unit 130 as a process in S220. If the CPU 110 determines that the input has not been made (determined No) in S220, the CPU 110 waits until an input is detected, while if the CPU 110 determines that the input has been made (determined Yes), in S230. Perform projection processing.

  As the projection processing in S230, the CPU 110 sends the video signal input by the image input unit 130 to the image processing unit 140, and the image processing unit 140 is changed in the number of video pixels, the frame rate, the shape, and the like. Perform the process. In S <b> 230, the CPU 110 causes the video signal after processing by the image processing unit 140 to be sent from the image processing unit 140 to the liquid crystal control unit 150. Then, the CPU 110 causes the liquid crystal control unit 150 to control the liquid crystal panel 151. At this time, the liquid crystal control unit 150 causes the liquid crystal panel to have a transmittance corresponding to the gradation levels of the R, G, and B color components of each frame image for each frame image processed by the image processing unit 140. The transmittance of each pixel of 151R, 151G, and 151B is controlled. In S230, the CPU 110 causes the light source controller 160 to control the light source 161 to emit light. The light emitted from the light source 161 is separated into R, G, and B light by the color separation unit 162 and is incident on the liquid crystal panels 151R, 151G, and 151B corresponding to the respective colors. The transmittance of each of the liquid crystal panels 151R, 151G, and 151B at this time is controlled for each pixel by the liquid crystal control unit 150. For this reason, the amount of transmitted light of the light incident on the liquid crystal panels 151R, 151G, and 151B is adjusted for each pixel.

  The R, G, and B lights transmitted through the liquid crystal panels 151R, 151G, and 151B are combined by the color combining unit 163. The light combined by the color combining unit 163 is projected onto a screen (not shown) via the projection optical system 171. The projection processing of S230 is sequentially executed for each frame image of the video signal input by the image input unit 130. Even when the processing of S230 is performed, for example, when an operation instruction for the projection optical system 171 is input via the operation unit 113 by the user, the CPU 110 controls the projection optical system 171 according to the operation instruction. To the optical system control unit 170. When the operation instruction of the projection optical system 171 is an instruction to change the focus of the projection image, for example, the CPU 110 causes the optical system control unit 170 to control the actuator for the focus adjustment lens of the projection optical system 171. When the operation instruction of the projection optical system 171 is an instruction to change the magnification ratio of the optical system, for example, the CPU 110 causes the optical system control unit 170 to control the actuator for the zoom lens of the projection optical system 171.

  During the execution of the process of the input image display mode, the CPU 110 determines whether or not an instruction to switch the display mode is input from the operation unit 113 as a process of S240. If the CPU 110 determines in S240 that an instruction to switch the display mode has been input by the user via the operation unit 113 (Yes), the process returns to S210. Returning to the processing of S210, the CPU 110 sends a menu screen for selecting a display mode to the image processing unit 140 as an OSD (on-screen display) image. At this time, the image processing unit 140 sends an image obtained by superimposing the OSD image on the image being processed at that time to the liquid crystal control unit 150. As a result, a video in which the OSD image is superimposed on the video projected at that time is projected on the screen. Therefore, the user can select a display mode while viewing the projected OSD image.

  On the other hand, if CPU 110 determines in S240 that an instruction to switch the display mode has not been input (determined No), the process proceeds to S250. In S250, the CPU 110 determines whether or not an instruction to end projection is input via the operation unit 113 by the user. If the CPU 110 determines in S250 that an instruction to end projection has been input (determined Yes), the CPU 110 stops the power supply to each block of the liquid crystal projector 100 and ends the video projection. On the other hand, if the CPU 110 determines in S250 that the projection end instruction has not been input (determined No), the process returns to S220, and thereafter, from S220, until the user inputs a projection end instruction. The process up to S250 is repeated.

  In the “file playback display mode”, the CPU 110 causes the recording / playback unit 191 to read out 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. To do. Then, the CPU 110 generates a character image based on the file list temporarily stored in the RAM 112 and an image of thumbnail data of each file by executing the program stored in the ROM 111, and sends it to the image processing unit 140. Also in the file reproduction display mode, the CPU 110 controls the image processing unit 140, the liquid crystal control unit 150, and the light source control unit 160 in the same manner as described in S230.

  Next, for example, the user looks at the menu screen displayed as an OSD image on the projection screen, and operates the instruction to select characters and images respectively corresponding to still image data and moving image data recorded on the recording medium 192. Assume that the input is made through the unit 113. In this case, the CPU 110 controls the recording / reproducing unit 191 so as to read the selected still image data or moving image data from the recording medium 192. Further, the CPU 110 temporarily stores the read still image data or moving image data in the RAM 112, and then controls each block so as to reproduce the still image or moving image based on the program stored in the ROM 111. . For example, when playing back a moving image, the CPU 110 sequentially sends each frame image of the moving image data read from the RAM 112 to the image processing unit 140, and the image processing unit 140 and the liquid crystal control unit 150 are similar to S230. The light source controller 160 is controlled. Further, when reproducing a still image, the CPU 110 sends the still image data read from the RAM 112 to the image processing unit 140, and similarly to S230, the image processing unit 140, the liquid crystal control unit 150, and the light source control unit 160. To 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 then stores the still image and moving image based on the program stored in the ROM 111. Control each block to play. The CPU 110 sequentially reads each frame image of the moving image data from the RAM 112 and sends it to the image processing unit 140 when reproducing the moving image. In addition, the CPU 110 reads still image data from the RAM 112 and sends it to the image processing unit 140 when reproducing a still image. Thereafter, the CPU 110 controls the image processing unit 140, the liquid crystal control unit 150, and the light source control unit 160 in the same manner as in S230 described above.

<Details of Configuration and Operation of Image Processing Unit and Liquid Crystal Display Unit>
FIG. 3 is a block diagram showing detailed internal configurations of the image processing unit 140 and the liquid crystal control unit 150, and the CPU 110, the light source 161, the light source control unit 160, and the liquid crystal panels 151R, 151G, and 151B. The image processing unit 140 includes a preprocessing unit 141, a memory control unit 142, an image memory 143, a post processing unit 144, and an output synchronization signal generation unit 145. The pre-processing unit 141, the memory control unit 142, the post-processing unit 144, and the output synchronization signal generation unit 145 are connected to the CPU 110 via the register bus 146. Further, a timing signal including an input vertical synchronization signal (hereinafter referred to as “IVD”) from the image input unit 130 is input to the preprocessing unit 141 and the memory control unit 142. Further, a timing signal including an output vertical synchronization signal (hereinafter referred to as “OVD”) from the output synchronization signal generation unit 145 is input to the memory control unit 142 and the post-processing unit 144.

  The preprocessing unit 141 converts the image sent from the image input unit 130 into an image having a color space and resolution suitable for the liquid crystal panel 151. Specifically, the preprocessing unit 141 performs preprocessing such as display layout including color space conversion and enlargement / reduction processing. The preprocessing unit 141 also performs keystone correction for correcting geometric distortion of an image projected on the screen.

  The memory control unit 142 performs conversion processing on the time axis such as IP conversion (interlace / progressive conversion) and frame rate conversion using the image memory 143, and image processing such as keystone correction in conjunction with the preprocessing unit 141. The memory control unit 142 performs frame double speed conversion and the like when the liquid crystal panel 151 needs to be driven by frame inversion driving. In any case, the memory control unit 142 performs writing control on the image memory 143 in synchronization with IVD and performs reading control in synchronization with OVD.

  The post-processing unit 144 performs correction for suppressing display unevenness (color unevenness, brightness unevenness), disclination, and the like caused by the liquid crystal panel 151 and the projection optical system 171. In addition, the post-processing unit 144 cancels the voltage-reflectance (transmittance) characteristics and converts to a linear luminance axis, with tone conversion represented by dithering in accordance with the tone characteristics of the liquid crystal panel 151. VT gamma conversion is performed.

  The output synchronization signal generation unit 145 generates an OVD that serves as a reference for driving the liquid crystal panel 151. The output synchronization signal generator 145 generates an OVD by counting a reference clock that is a base of a dot clock (not shown). The OVD is a reference signal for synchronizing the blocks from the reading of the memory control unit 142 of the image processing unit 140 to the liquid crystal control unit 150 that controls the liquid crystal panel 151.

  The liquid crystal control unit 150 includes a drive data conversion unit 153 and an image memory 154. The drive data conversion unit 153 is connected to the CPU 110 via the register bus 146. Further, the drive data conversion unit 153 receives a timing signal including OVD from the output synchronization signal generation unit 145.

  The drive data conversion unit 153 performs data conversion on the data processed by the post-processing unit 144 so as to be an I / O (input / output) suitable for the interface of the liquid crystal panel 151. Specifically, the drive data conversion unit 153 includes an LVDS (low voltage differential signal) transmitter when the liquid crystal panel 151 is digitally driven, and a driver IC with a built-in DA (digital / analog) conversion function when analogly driven. Consists of. Further, the drive data conversion unit 153 performs black correction for setting a black level other than the drive area that is to be an effective display area on the liquid crystal panel 151.

  The drive data conversion unit 153 generates various drive signals for driving the liquid crystal panel 151 with OVD as a reference. As a specific drive signal, the drive data conversion unit 153 generates a pulse (HST) indicating timing for latching horizontal data and a horizontal shift clock (HCK) for storing data in the horizontal shift register. The drive data conversion unit 153 generates a pulse indicating a drive start line (hereinafter referred to as “VST”), a vertical shift clock (VCK) for scanning in the line direction, and the like. Here, in the case of the analog drive method, the drive data conversion unit 153 performs data control for updating the image of the liquid crystal panel 151 only once in the OVD period, and uses the DA conversion function for the amplitude modulation gradation data. Convert to analog signal. On the other hand, in the case of the digital drive method, the drive data conversion unit 153 performs PWM (pulse width modulation) using a plurality of subfields (SF) in the OVD cycle, and rewrites and updates the liquid crystal panel 151 by switching the subfields. In this way, gradation display is performed. The PWM drive waveform is generated by the drive data converter 153 controlling the image memory 154 based on the PWM waveform pattern information.

  The light source control unit 160 is a drive power supply unit configured in accordance with the light source 161. When the light source 161 is a lamp light source, the light source control unit 160 includes a power supply ballast circuit. In addition, when the light source 161 is a solid light source (LED light source or LD light source), the light source control unit 160 includes a light source driving unit corresponding to the solid light source. The light source control unit 160 is connected to the CPU 110 via the register bus 146, and the CPU 110 controls on / off of the light source 161 and the light emission amount via the light source control unit 160.

<Operations for setting panel alignment, alignment area, display area and alignment>
Hereinafter, alignment adjustment performed by the liquid crystal projector 100 of the present embodiment will be described.
In FIG. 4A, a panel drive area 300, an update area 301, and an effective display area 302 are set on the panel surface of the liquid crystal panel 151, and the panel drive area 300 and the update area 301 are set to be approximately equal in size. FIG. The panel drive region 300 is a region in which pixels that can be driven in the liquid crystal panel 151 are two-dimensionally arranged. The update area 301 is an area where display is updated in the panel drive area 300. The effective display area 302 is an area set in the update area 301, and is an area where an actual display video or the like is formed. On the other hand, FIG. 4B is an image diagram in a state where an update area 303 narrower than the panel drive area 300 of the liquid crystal panel 151 is set, and an effective display area 302 is set in the update area 303.
Here, as shown in FIG. 4B, the situation where the update region 303 narrower than the panel drive region 300 is set may occur when the liquid crystal panel 151 is digitally driven. More specifically, the resolution of the update area 303 is limited by the maximum transfer band of data transferred to the liquid crystal panel 151. The transfer band in the digital drive needs to satisfy the following expressions (1) and (2).

Maximum transfer band> Resolution area resolution × SF number × Drive frequency (1)
However, the resolution of the update area = the total number of horizontal pixels x the total number of vertical lines (2)

  In the case of digital driving, since a driving frequency is determined when a large number of subfields (SF number) are assigned for gradation expression by digital driving or image quality improvement due to panel driving, Formula (1), Formula The resolution of the update area (2) is restricted. In addition, in the actual liquid crystal panel 151, since the pixels in the horizontal line are generally updated at the same time, the number of vertical lines to be updated is substantially limited. For this reason, when the liquid crystal panel 151 is digitally driven, an update area 303 narrower than the panel drive area 300 is set as shown in FIG.

  In the present embodiment, it is assumed that the liquid crystal panel 151 is digitally driven in the liquid crystal projector 100. Accordingly, as shown in FIG. 4B, the liquid crystal projector 100 of the present embodiment sets an update area 303 narrower than the panel drive area 300 of the liquid crystal panel 151, and the effective display area 302 is included in the update area 303. Set. Then, the liquid crystal projector 100 of the present embodiment performs alignment adjustment to adjust the display position of the image projected on the screen by adjusting the relative position of the update area 303 with respect to the panel drive area 300 of the liquid crystal panel 151. . Further, an area other than the effective display area 302 in the update area 303 is set as, for example, a black area 304 as a predetermined adjustment area. The black area 304 as a predetermined adjustment area is an area that can be used for various adjustments such as alignment adjustment. The black region 304 is set, for example, on the side of the update region 303, and is a region having a width of at least one pixel (one line) or more. In the example of FIG. 4B, as an example, it is assumed that a black area 304 of 8 pixels (8 lines) is set for one side of the update area 303. The black area 304 as the adjustment area does not need to be set corresponding to each side of the update area 303. For example, in the case of alignment adjustment, the black area 304 is set only on the side corresponding to the adjustment direction. Also good. In addition, the predetermined adjustment area is not limited to the black area, and may be an area of another color. In the panel drive area 300, the non-update area 305 other than the update area 303 is an area where the display is not updated.

Hereinafter, in order to facilitate understanding of the alignment adjustment performed in the liquid crystal projector 100 of the present embodiment, an outline and problems of general alignment adjustment will be described, and then the alignment adjustment in the present embodiment will be described.
FIGS. 5A to 5C are image diagrams of alignment adjustment in the case where the panel drive area 300 and the update area 301 are set to substantially the same size as in FIG. 4A described above. . In the case of region setting as shown in FIG. 4A, alignment adjustment is performed by changing the adjustment offset of the effective display region 302 as shown in FIGS. 5A to 5C. FIG. 5B shows an example in which the effective display area 302 is set substantially at the center of the panel drive area 300, and the offset amount of the effective display area 302 at that time is the adjustment offset 312. 5A shows an alignment adjustment 311 in which the adjustment offset 310 of the effective display area 302 is changed by, for example, 8 pixels downward in the vertical direction from the adjustment offset 312 of the effective display area 302 of FIG. 5B. An example is given. 5C, the alignment adjustment 313 is performed in which the adjustment offset 314 of the effective display area 302 is changed by, for example, 8 pixels above the adjustment offset 312 of the effective display area 302 of FIG. 5B in the vertical direction. An example is shown. In the case of the area setting as shown in FIG. 4A, since the update area 301 and the panel drive area 300 are substantially equal, alignment adjustment can be performed within the range of the update area 301.

  On the other hand, FIG. 6A to FIG. 6C are image diagrams of alignment adjustment when the update region 303 narrower than the panel drive region 300 is set as shown in FIG. 4B. In the case of the area setting as shown in FIG. 4B, the alignment adjustment is performed by changing the adjustment offset of the update area 303 as shown in FIGS. 6A to 6C. FIG. 6B shows an example in which the update area 303 is set substantially at the center of the panel drive area 300 and the offset amount of the update area 303 at that time is the adjustment offset 322. 6A, the alignment adjustment 321 is performed by changing the adjustment offset 320 of the update area 303 by, for example, 8 pixels downward in the vertical direction from the adjustment offset 322 of the update area 303 of FIG. 6B. An example is shown. In FIG. 6C, the alignment adjustment 323 in which the adjustment offset 324 in the update area 303 is changed by, for example, 8 pixels above the adjustment offset 322 in the update area 303 in FIG. 6B in the vertical direction is performed. An example is shown.

  4B, alignment adjustment can be performed within the range of the panel drive region 300. In this case, the alignment adjustment amount must be within the range of the black region 304. However, the adjustment amount of the adjustment offset may become larger than the range of the black region 304 depending on the magnitude of the positional deviation of the liquid crystal panel 151, the color composition unit 163, and the like. FIGS. 7A and 7B are image diagrams when the adjustment amount is larger than the range of the black region 304. FIG. FIGS. 7A and 7B show the adjustment offset of FIG. 7B from the adjustment offset 330 of FIG. 7A when the range of the black region 304 is, for example, ± 8 pixels in the vertical direction. The example in which the alignment adjustment 331 for 16 pixels up to 334 is performed is shown. When the alignment adjustment amount is larger than the range of the black area 304 as in the examples of FIGS. 7A and 7B, for example, the image of the effective display area 302 in FIG. It remains in the non-update area 305 of b) and may be visually recognized by the user.

<Alignment Adjustment Operation of First Embodiment>
For this reason, the liquid crystal projector 100 according to the first embodiment performs alignment adjustment as described below.
FIGS. 8 and 9 are flowcharts showing the flow of processing when alignment adjustment is performed in the liquid crystal projector 100 of the first embodiment. The flowcharts shown in FIGS. 8 and 9 show the flow of processing when the CPU 110 controls each block in alignment adjustment.
First, the flowchart of FIG. 8 will be described. The flowchart of FIG. 8 shows the flow of the overall processing at the time of alignment adjustment.

  In the present embodiment, for example, the alignment adjustment is started when an operation instruction for instructing the start of the alignment adjustment is input from the user via the operation unit 113. In S100, the CPU 110 determines whether or not to start the alignment adjustment mode by monitoring whether or not an operation instruction for starting the alignment adjustment is input from the operation unit 113. CPU110 advances a process to S101, when it determines with starting alignment adjustment mode in S100 (it determines with Yes).

In S <b> 101, the CPU 110 determines whether or not a horizontal alignment adjustment request instruction is input from the user via the operation unit 113, for example. If the CPU 110 determines in S101 that a horizontal alignment adjustment request instruction has been input (determined Yes), the process proceeds to S102.
In S102, the CPU 110 controls the drive data conversion unit 153 through the register bus 146 to perform a normal horizontal alignment adjustment process. After S102, the CPU 110 advances the process to S103.
On the other hand, in S101, for example, if the instruction from the user via the operation unit 113 is not a horizontal alignment adjustment request instruction (when determined No in S101), the CPU 110 advances the process to S103.

In S <b> 103, the CPU 110 determines whether a vertical alignment adjustment request instruction is input from the user via the operation unit 113, for example. If the CPU 110 determines in S103 that a vertical alignment adjustment request instruction has been input (Yes), the process proceeds to S104.
In S <b> 104, the CPU 110 performs vertical alignment adjustment processing by controlling the drive data conversion unit 153 through the register bus 146. Details of the alignment adjustment processing in the vertical direction will be described later. After S104, the CPU 110 advances the process to S105.
On the other hand, if the instruction from the user via the operation unit 113 is not a vertical alignment adjustment request instruction in S103, for example, the CPU 110 returns the process to S101.

In S105, after completing the alignment adjustment, the CPU 110 monitors whether or not an operation instruction for instructing the end of the alignment adjustment is input from the user via, for example, the operation unit 113, thereby ending the alignment adjustment mode. Judge whether or not. If the CPU 110 determines in S105 that the alignment adjustment mode is to be ended (determined as Yes), the CPU 110 ends the processing of the flowchart of FIG.
On the other hand, in S105, for example, when an instruction to perform alignment adjustment again is input from the user via the operation unit 113 (when it is determined No in S105), the CPU 110 returns the process to S101. As described above, the CPU 110 repeats the processing from S101 to S104 until it is determined in S105 that an instruction to end alignment adjustment is input.

Next, the flowchart of FIG. 9 will be described. The flowchart in FIG. 9 shows the detailed processing flow of S104 in FIG.
In S200, when an input for setting the vertical alignment adjustment amount and adjustment direction is made from the user via the operation unit 113 or a remote controller (not shown), for example, the CPU 110 advances the process to S201.

  In S201, the CPU 110 calculates an adjustment margin. Here, the adjustment margin corresponds to the width represented by the difference between the line addresses of the panel drive area 300 and the update area 303 with respect to the adjustment direction. The adjustment margin differs depending on the moving direction of the update region 303 by the alignment adjustment (direction of change when changing the adjustment offset). The CPU 110 calculates an adjustment margin in the adjustment direction of the alignment adjustment. After S201, the CPU 110 advances the process to S202.

  In S202, the CPU 110 compares the alignment adjustment amount with the adjustment margin and determines whether or not the adjustment amount is smaller than the adjustment margin. If the CPU 110 determines in S202 that the adjustment amount is smaller than the adjustment amount (Yes), the process proceeds to S204, and if it is determined that the adjustment amount exceeds the adjustment amount (No), the process proceeds to S203. Proceed with the process. In S203, the CPU 110 displays an error notification notifying that the alignment adjustment cannot be performed on the display unit 196 via, for example, the display control unit 195, and then returns the process to step S200.

  In S <b> 204, the CPU 110 compares the alignment adjustment amount with the size (width) of the black region 304 on the adjustment direction set in the update region 303, and determines whether the adjustment amount exceeds the black region as a predetermined amount. Determine. If the CPU 110 determines in S204 that the adjustment amount exceeds the black area (determined as Yes), the process proceeds to S205, and if it is determined that the adjustment amount is equal to or less than the black area (determined No), S206. Proceed with the process. In S206, the CPU 110 controls the drive data conversion unit 153 through the register bus 146 to perform normal vertical alignment adjustment. In this case, since the alignment adjustment amount is within the range of the black region 304, an image that has not been updated does not remain in the non-update region 305. After S206, the CPU 110 ends the alignment adjustment process.

  In S205, the CPU 110 divides the alignment adjustment amount by the size of the black region 304 (adjustment amount / black region), and obtains a quotient and a remainder (remainder) by the division operation. Further, the CPU 110 sets the quotient obtained by the division operation as the division number N obtained by dividing the alignment adjustment amount, and sets the remainder as M. After S205, the CPU 110 advances the process to S207.

  In S207, the CPU 110 controls the drive data conversion unit 153 to perform alignment adjustment in a divided manner with a small adjustment amount obtained by dividing the alignment adjustment amount by the division number N. In the present embodiment, a small adjustment amount obtained by dividing the alignment adjustment amount by the division number N is referred to as a division adjustment amount. Here, as an example, when the alignment adjustment amount set in S200 is, for example, 16 pixels and the size (width) of the black region 304 is 8 pixels, the division number N calculated in S205 is 2, and the remainder Becomes 0. Therefore, in S207, the CPU 110 controls the drive data conversion unit 153 to perform the alignment adjustment in which the alignment adjustment amount is divided into two times for each division adjustment amount.

  10A to 10C, the alignment adjustment amount is 16 pixels, the size (width) of the black region 304 is 8 pixels, the division number N is 2, the remainder is 0, and the adjustment direction is the vertical direction. When it is an upper side, it is an image figure when alignment adjustment is performed in two steps. FIG. 10A shows an update area 303, an effective display area 302, a black area 304, and an adjustment offset 350 before alignment adjustment. In the present embodiment, the CPU 110 first adjusts the adjustment offset 350 in the update area 303 in FIG. 10A by changing the vertical adjustment direction upward by 8 pixels as shown in FIG. 10B. As the offset 352, the first alignment adjustment 351 is performed. In the first alignment adjustment 351, the division adjustment amount is 8 pixels and is within the range of 8 pixels in the black area 304, so that an image that has not been updated does not remain in the non-update area 305. At this time, the CPU 110 controls the drive data conversion unit 153 to update the display of the update area 303 in FIG. Next, the CPU 110 sets the adjustment offset 352 of the update area 303 in FIG. 10B as an adjustment offset 354 that is changed vertically by 8 pixels of the division adjustment amount in the vertical direction as shown in FIG. A second alignment adjustment 353 is performed. In the second alignment adjustment 351, the division adjustment amount is 8 pixels and is within the range of 8 pixels in the black area 304, so that an image that has not been updated does not remain in the non-update area 305.

As another example, when the alignment adjustment amount set in S200 is, for example, 10 pixels and the black region 304 is 8 pixels, the division number N calculated in S205 is 1, and the remainder is 2. Although not shown, in this example, the CPU 110 changes the adjustment offset by 8 pixels of the division adjustment amount in the first alignment adjustment, and the adjustment offset by 2 remainders in the second alignment adjustment. To change. Also in this example, since the division adjustment amount is 8 pixels and within the range of 8 pixels in the black area 304 in the first alignment adjustment, an image that has not been updated in the non-update area 305 remains. Absent. In the second alignment adjustment, the adjustment offset is changed by two pixels, so that an image that has not been updated does not remain in the non-update region 305.
When the alignment adjustment in S207 ends, the CPU 110 ends the alignment adjustment process.

  In the alignment adjustment according to the present embodiment, the small adjustment amount (division adjustment amount) is not limited to the above-described eight pixels, and any value can be used as long as it does not exceed the black area in one alignment adjustment. May be made. However, if the small adjustment amount for one alignment adjustment is significantly smaller than the size of the black area, the number of alignment adjustments increases, so the single small adjustment amount should be the same as the black area size. Is desirable.

  As described above, in the liquid crystal projector 100 according to the first embodiment, when an update region narrower than the panel drive region is set, when the alignment adjustment amount exceeds the black region, each division adjustment amount based on the division number N is set. Adjust the alignment step by step. Thereby, according to the first embodiment, even when the alignment adjustment amount is large, the alignment adjustment can be performed without leaving an image in the non-update region 305, and there is no need to limit the alignment adjustment amount. . Therefore, according to the first embodiment, even when the positional deviations of the liquid crystal panel 151, the color synthesis unit 163, and the like are large, the color deviation can be eliminated by the alignment adjustment.

<Second Embodiment>
In the first embodiment, the description has been made on the assumption that the above-described formulas (1) and (2) do not place restrictions on the number of subfields (number of SFs) and the drive frequency. In the second embodiment, an example will be described in which the alignment adjustment amount is reduced by changing the drive frequency or the number of SFs and changing the transfer band of the update region when performing alignment adjustment.
FIG. 11 is a flowchart illustrating a flow of processing when alignment adjustment is performed in the liquid crystal projector 100 according to the second embodiment. The flowchart in FIG. 11 shows the flow of control by the CPU 110.

Also in the case of the second embodiment, as described above, the alignment adjustment is started when an operation instruction for instructing the start of the alignment adjustment is input from the user via the operation unit 113. The CPU 110 determines whether or not to start the alignment adjustment mode in S300, and if it is determined to start the alignment adjustment mode (determined as Yes), the process proceeds to S301.
In S301, the CPU 110 controls the output synchronization signal generation unit 145 or the drive data conversion unit 153 to perform a band reduction process for reducing the transfer band of the update area. Here, in the second embodiment, there are two specific bandwidth reduction methods for reducing the transfer bandwidth of the update area.

  The first band reduction method is a process of reducing the drive frequency (frequency of the output vertical synchronization signal OVD) generated by the output synchronization signal generation unit 145 under the control of the CPU 110. When the drive frequency generated by the output synchronization signal generator 145 is lowered, the memory controller 142 operates as a free-run mode that operates asynchronously with respect to IVD and OVD. In the free-run mode, there is a possibility that display discomfort may occur due to a mixture of images of different frames on the screen during normal moving image display. However, during alignment adjustment, a still image pattern for adjustment is generally displayed in the effective display area 302, so that different frame images are not mixed as in the case of moving image display. There is no sense of incongruity.

The second band reduction method is to perform processing for reducing the number of subfields by controlling the drive data conversion unit 153 by the CPU 110. When the number of subfields is reduced, problems specific to digital driving, such as deterioration in gradation of display image quality and deterioration of pseudo contours during moving image display, may become significant. However, in this case as well, the adjustment still image pattern is displayed in the effective display area 302 during the alignment adjustment, as described above. Does not occur.
After S301, the CPU 110 advances the process to S302.

In S <b> 302, the CPU 110 performs the extension process of the update area 303 by reducing the transfer band of the update area 303 by any one of the two band reduction methods described above.
Here, a specific processing image of the extension processing of the update area 303 will be described below. In the above formulas (1) and (2), for example, when the drive frequency is lowered, the total number of vertical lines in the update area 303 after the expansion process is obtained by formula (3).
Total number of vertical lines after expansion = (driving frequency before expansion / driving frequency after expansion) × total number of vertical lines before expansion (3)

  According to this formula (3), for example, when the total number of vertical lines before expansion is 2000 lines and the drive frequency is lowered from 120 Hz to 110 Hz, the update region 303 can be expanded by 182 lines. This indicates that the black region 304 can be expanded by 91 lines on the upper side in the vertical direction of the update region 303 and 91 lines on the lower side. As a result, if there is a margin for adjustment, it is possible to adjust the alignment up to an adjustment amount of ± 91 pixels at a maximum.

On the other hand, in the above formulas (1) and (2), for example, when the number of subfields (SF number) is decreased, the total number of vertical lines in the update area 303 after the expansion process is obtained by formula (4).
Total number of vertical lines after expansion = (number of SFs before expansion / number of SFs after expansion) × total number of vertical lines before expansion (Equation 4)

  According to this equation (4), for example, when the total number of vertical lines before expansion is 2000 lines and the number of SFs is reduced from 30 to 29, the update area 303 can be expanded by 68 lines. This indicates that the black area 304 can be expanded by 34 lines on the upper side in the vertical direction of the update area 303 and 34 lines on the lower side. As a result, if there is a margin for adjustment, it is possible to adjust the alignment up to an adjustment amount of ± 34 pixels at a maximum.

  As described above, the CPU 110 expands the update area 303 by reducing the transfer band of the update area, and expands the black area 304 by expanding the update area 303. Here, the expansion amount (expansion width) of the black region 304 may be an amount corresponding to at least the alignment adjustment amount. As an example, the expansion of the black area 304 corresponding to the alignment adjustment amount can be realized by reducing the transfer band in accordance with the difference between the size (width) of the black area 304 before the expansion and the alignment adjustment amount. In this case, the CPU 110 obtains a difference between the width of the black area 304 before expansion and the alignment adjustment amount, determines a transfer band according to the difference, and lowers the drive frequency so as to become the transfer band, or SF Reduce the number. The CPU 110 sets the black region 304 to a size (width) corresponding to the alignment adjustment amount by performing such transfer band reduction control. Thereby, alignment adjustment within the range of the black region 304 is possible.

  After S302, the CPU 110 advances the process to S303. In S303, the CPU 110 controls the drive data conversion unit 153 to perform alignment adjustment processing using the black region 304 expanded in S302. In this case, since the alignment adjustment can be performed within the range of the maximum adjustment amount due to the expansion of the black area 304, an image that has not been updated does not remain in the non-update area 305. After S303, the CPU 110 advances the process to S304.

  In S304, the CPU 110 determines whether or not to end the alignment adjustment mode by monitoring whether or not an operation instruction for instructing the end of alignment adjustment is input from the user via the operation unit 113, for example. If it is determined in S304 that the alignment adjustment mode is to be ended (Yes), the CPU 110 advances the process to S305. On the other hand, in S304, for example, when an instruction to perform alignment adjustment again is input from the user via the operation unit 113 (when it is determined No in S304), the CPU 110 returns the process to S303.

  In S305, the CPU 110 returns the update area 303 to the state before the expansion process of S302 is performed, and advances the process to S306. In S306, the CPU 110 returns the bandwidth reduced in S301 to the state before reduction. Thereafter, the CPU 110 ends the process of the flowchart of FIG.

  As described above, in the liquid crystal projector 100 according to the second embodiment, when the update area 303 narrower than the panel drive area 300 is set, the update area 303 is expanded by reducing the transfer band, and the black area 304 is associated therewith. Has been extended. Accordingly, the liquid crystal projector 100 according to the second embodiment can perform alignment adjustment without leaving an image in the non-update area 305, and can substantially eliminate the restriction on the alignment adjustment amount. Therefore, according to the second embodiment, even when the positional deviations of the liquid crystal panel 151, the color synthesis unit 163, and the like are large, the color deviation can be eliminated by the alignment adjustment.

<Third Embodiment>
In the second embodiment, for example, the limit of the alignment adjustment amount is reduced by decreasing the frequency (drive frequency) of the output vertical synchronization signal (OVD) and increasing the black region 304. In the third embodiment, the frequency of the output vertical synchronizing signal (OVD) (driving frequency) is linked to the frequency of the input vertical synchronizing signal (IVD) corresponding to the input image data, thereby updating according to the IVD frequency. In this example, the area 303 and the black area 304 can be expanded. In the following description, the frequency of the input vertical synchronization signal (IVD) is expressed as an input frequency.

In the case of the third embodiment, the processes in S400 and S401 in FIG. 12 are performed between S202 and S204 in FIG. 9 described above. S400 and S401 in FIG. 12 are processes performed by the CPU 110.
In the case of the third embodiment, when the CPU 110 determines that the alignment adjustment amount is smaller than the adjustment margin (determined Yes) in S202 of FIG. 9, the process proceeds to S400 of FIG. In S400, as an example, the CPU 110 communicates with the preprocessing unit 141 or the memory control unit 142 through the register bus 146, and detects IVDs input thereto. In addition, the CPU 110 communicates with the output synchronization signal generation unit 145 through the register bus 146 and detects the OVD generated by the output synchronization signal generation unit 145. After S400, the CPU 110 advances the process to S401.

  In S401, the CPU 110 controls the output synchronization signal generation unit 145 to link the OVD to the IVD. As described above, when the OVD is linked to the IVD, the lower the input frequency (IVD frequency) is, the lower the driving frequency (OVD frequency) is. Thus, the above-described equations (1) and (2) The bandwidth limitation of will become smaller. Therefore, for example, when the input frequency is lowered and the drive frequency is lowered, as described in the second embodiment, the update region 303 is expanded, and as a result, the black region 304 is also increased. When the black area 304 is increased, as described in the second embodiment, the restriction on the alignment adjustment amount is reduced.

  In the case of the third embodiment, when the update area 303 is expanded in conjunction with IVD and OVD in S401, the CPU 110 calculates a change in the black area 304 according to the extension of the update area 303. . After S401, the CPU 110 advances the process to S204 in FIG. When the process proceeds to S204 in FIG. 9 in the third embodiment, the CPU 110 determines whether or not the black area is larger than the adjustment amount, including the change in the black area calculated in S401. Here, in the case of the third embodiment, when the input frequency is lowered and the drive frequency is lowered, the above-described black region 304 is expanded. However, when the adjustment amount exceeds the black region, the CPU 110 Then, the process proceeds to S205 in FIG.

  In the liquid crystal projector 100 according to the third embodiment, even when the black area 304 is expanded by the interlocking of IVD and OVD, only when the amount of one-time alignment adjustment exceeds the black area 304 of the update area 303, the processes of S205 and S207 Adjustment processing for each division adjustment amount is performed. Thereby, according to 3rd Embodiment, the effect of both 1st and 2nd embodiment can be acquired.

<Other embodiments>
In the first to third embodiments described above, the alignment adjustment for each color of R, G, B is given as an example. However, the adjustment amount and the adjustment direction are the same for each color of R, G, B. It is also applicable to. In this way, adjustments that make the adjustment amount and the adjustment direction the same for each color of R, G, and B include, for example, adjustment that shifts the entire projection screen, and combination position adjustment in multi-projection that combines a plurality of projection screens Can be used.

The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.
The above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

  142 memory control unit, 143 image memory, 145 output synchronization signal generation unit, 153 drive data conversion unit, 151R, 151G, 151B liquid crystal panel, 110 CPU

Claims (14)

Forming means for forming an image for projection onto a screen on the panel surface by having each panel driven by a driving means having a panel surface in which a plurality of pixels are two-dimensionally arranged;
Drive means for driving each pixel in an update area narrower than the drive area of the panel surface of the forming means to update the image on the panel surface;
Adjusting means for adjusting the display position of the image projected on the screen by adjusting the relative position of the update area with respect to the drive area;
When adjusting the relative position, when the adjustment amount of the relative position exceeds a predetermined amount, the adjustment unit divides the adjustment by a small adjustment amount smaller than the predetermined amount until the adjustment amount is reached. A display device that adjusts a relative position.   The adjustment means uses the small adjustment amount when the adjustment amount in the adjustment direction when adjusting the relative position exceeds the predetermined amount set according to the adjustment direction of the update region. The display device according to claim 1, wherein the relative position is adjusted.   3. The adjustment unit according to claim 1, wherein the adjustment unit sets, as the small adjustment amount, a division adjustment amount obtained by dividing the adjustment amount according to a width of the adjustment region set in the update region. Display device.   The adjustment means divides the adjustment amount by the width of the adjustment area to obtain a quotient and a remainder, uses the quotient as the division adjustment amount, adjusts the relative position using the division adjustment amount, and performs the adjustment. The display device according to claim 3, wherein the relative position is adjusted using the remainder when a remaining amount is less than the division adjustment amount. The adjusting means includes
An input frequency corresponding to an input image that is a source of a projection image formed on the panel surface of the forming unit is detected, and a driving frequency when the driving unit drives the forming unit is linked to the input frequency. ,
In accordance with the drive frequency linked to the input frequency, change the width of the adjustment region by setting the size of the update region,
5. The relative position is adjusted by the small adjustment amount by setting the small adjustment amount only when the adjustment amount exceeds the adjustment region of the changed width. The display device described in 1. Forming means for forming an image for projection onto a screen on the panel surface by having each panel driven by a driving means having a panel surface in which a plurality of pixels are two-dimensionally arranged;
Drive means for driving each pixel in an update area narrower than the drive area of the panel surface of the forming means to update the image on the panel surface;
Adjusting means for adjusting the display position of the image projected on the screen by adjusting the relative position of the update area with respect to the drive area;
When adjusting the relative position, the adjustment means sets the update area by extending the update area driven by the drive means if the adjustment amount of the relative position exceeds a predetermined amount. A display device, wherein the adjusted adjustment area is expanded and the relative position is adjusted by the adjustment amount using the extended adjustment area.   The adjusting unit is configured to extend the update region by lowering a transfer band between the driving unit and the forming unit, and to set the adjustment region according to the expanded update region. The display device according to claim 6.   The display device according to claim 7, wherein the adjustment unit lowers the transfer band according to a difference between a width of the adjustment area before being expanded and the adjustment amount.   The display device according to claim 7, wherein the adjusting unit lowers the transfer band by lowering a driving frequency when the driving unit drives the forming unit.   9. The display device according to claim 7, wherein the adjustment unit reduces the transfer band by reducing the number of subfields when the driving unit drives the forming unit in subfields. The forming means has three panel surfaces corresponding to the three primary colors,
The driving means drives each pixel on the three panel surfaces,
The predetermined amount is the width of the black area;
The said adjustment means adjusts the display position of the image projected on a screen by adjusting the said relative position of the said update area | region of the said three panel surfaces, The any one of Claims 1-10 characterized by the above-mentioned. The display device described in 1. A display device control method comprising:
A driving unit driving each pixel of the forming unit having a panel surface in which a plurality of pixels are two-dimensionally arranged to form an image for projection on a screen on the panel surface of the forming unit;
Driving means for driving each pixel in an update area narrower than the drive area of the panel surface of the forming means to update the image on the panel surface;
Adjusting means, adjusting the relative position of the update area with respect to the drive area to adjust the display position of the image projected on the screen, and
The step of adjusting the relative position is a step of adjusting the relative position, if the adjustment amount of the relative position exceeds a predetermined amount, a small adjustment amount smaller than the predetermined amount until the adjustment amount is reached. A method for controlling a display device, further comprising the step of adjusting the relative position in a divided manner. A display device control method comprising:
A driving unit driving each pixel of the forming unit having a panel surface in which a plurality of pixels are two-dimensionally arranged to form an image for projection on a screen on the panel surface of the forming unit;
Driving means for driving each pixel in an update area narrower than the drive area of the panel surface of the forming means to update the image on the panel surface;
Adjusting means, adjusting the relative position of the update area with respect to the drive area to adjust the display position of the image projected on the screen, and
The step of adjusting the relative position is performed by expanding the update region driven by the driving unit when the relative position adjustment amount exceeds a predetermined amount when the relative position is adjusted. The display apparatus control method further comprising a step of expanding an adjustment area set as an update area and adjusting the relative position by the adjustment amount using the expanded adjustment area.   A program for causing a computer to execute each step of the display device control method according to claim 12 or 13.

Images