JP2014219572A - Display device and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the image quality in a display system for performing one display by combining a plurality of projection type display devices.SOLUTION: The display device for displaying an image by projection includes an extinction correction curve table 104, and an extinction correction unit 107. The extinction correction curve table 104 stores a plurality of extinction correction curves that vary the luminance from a predetermined position of the image to the end of the image and cause different variations. The extinction correction unit 107 varies the luminance from the predetermined position of the image to the end of the image, using the extinction correction curve that is changed and selected, every predetermined timing, from the plurality of extinction correction curves stored in the extinction correction curve table 104.

Description

  The present invention relates to a projection display device and a control method thereof, and more particularly to a control technique for combining a plurality of display devices to perform one display.

  2. Description of the Related Art Conventionally, a projection type display device (projector) that displays an image by projecting on a screen has been widely used. There is also known a display system that performs a single display by combining a plurality of projection type display devices in order to display an image with a larger screen and a higher number of pixels.

  In such a display system, the adjacent portions of the images projected by the adjacent display devices are aligned so as to overlap each other, and the screen is displayed without interruption. In general, as the number of pixels increases, the accuracy of alignment required increases, but there are cases where desired alignment cannot be realized due to various causes.

  For example, when alignment is performed without using a dedicated jig, the pixel positions may not match each other and shift. In addition, the display device may be displaced from the position at the time of installation due to a change in component dimensions accompanying minute changes in temperature and humidity, minute vibrations, changes with time, and the like.

  When the positional deviation occurs in this way, the image blurs or doubles in the overlapping region, and the image becomes very difficult for the user to see. In addition, the seam of the image becomes conspicuous, and the image quality is greatly deteriorated.

  On the other hand, various methods have heretofore been proposed as methods for making the joints of images projected by a display device inconspicuous.

  For example, in the following Patent Document 1, a configuration is proposed in which the division position (seam) between images projected by each adjacent display device is changed at a predetermined timing at the left end, the right end, and the position between them in the overlapping region. ing.

Japanese Patent No. 4400200

  However, even if the configuration of Patent Document 1 is used, it is difficult to hide the joint between images projected by the adjacent display devices when the display device is displaced. This is because when a gap (or overlap) is generated at the division position due to the position shift of the display device, a portion having a large pixel value step between adjacent pixels is generated. In other words, the pixel value step cannot be hidden by simply changing the division position at a predetermined timing, and the seam becomes conspicuous.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve image quality in a display system that performs a single display by combining a plurality of projection type display devices.

In order to achieve the above object, a display device according to the present invention has the following configuration. That is,
A display device that projects and displays an image,
Storage means for correcting a luminance value between a predetermined position of the image and a position of an end of the image, and storing a plurality of different correction curves;
A luminance value between a predetermined position of the image and a position of an end portion of the image using a correction curve selected by switching at a predetermined timing from a plurality of correction curves stored in the storage unit And a control means for projecting an image with the corrected brightness value.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to aim at the improvement of an image quality in the display system which combines several projection type display apparatuses and performs one display.

It is a block diagram which shows the function structure of the display apparatuses 100 and 110 which concern on 1st Embodiment. 1 is a block diagram illustrating a configuration of a display system including a plurality of display devices 100, 110, and 120. FIG. It is a figure which shows the shape of each light attenuation correction curve which the display apparatus 100 has. FIG. 10 is a diagram illustrating switching timing of a dimming correction curve in the display device 100. It is a figure which shows the light attenuation correction curve used for a light attenuation correction process in each timing. It is a figure which shows the shape of the other attenuation correction curve which the display apparatus 100 has. It is a block diagram which shows the function structure of the display apparatuses 700 and 710 which concern on 2nd Embodiment. It is a figure which shows the switching timing of the dimming correction curve in the display apparatuses 700 and 710. FIG. It is a figure which shows the shape of each light attenuation correction curve with which the display apparatuses 700 and 710 are provided. It is a figure which shows the light attenuation correction curve used for a light attenuation correction process in each timing. It is a block diagram which shows the function structure of the display apparatuses 1100 and 1110 which concern on 3rd Embodiment. 12 is a flowchart showing a flow of light reduction correction processing in the display device 1100.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the projection type display device (projector) in each of the following embodiments has a plurality of dimming correction curves, and these are switched at a predetermined timing to perform the dimming correction process so that the seam of the image is conspicuous. It is something to prevent.

  Among these, in the first embodiment, a case where the switching timing is performed in accordance with the frame rate of the image will be described. In the second embodiment, a case will be described in which the switching timing is synchronized between adjacent display devices and a complementary dimming correction curve is used. Furthermore, in the third embodiment, a case will be described in which the switching timing is a timing at which an event that causes a shift in the image display position occurs.

  The configurations shown in the following embodiments are merely examples, and the present invention is not limited to the illustrated configurations.

[First Embodiment]
<1. Configuration of Projection Type Display Device>
First, the functional configuration of the projection display device (projector) according to the present embodiment will be described. FIG. 1 is a diagram illustrating a functional configuration of the display devices 100 and 110. Since the display device 100 and the display device 110 have the same functional configuration, only the functional configuration of the display device 100 will be described below.

  In FIG. 1, reference numeral 101 denotes a video input unit that inputs uncompressed video data from an external video source device. Note that the video data is input by a transmission method based on various interface standards such as HDMI (registered trademark), DVI, and display port.

  Reference numeral 102 denotes a timing generation unit that generates a synchronization signal that serves as a reference for the display operation of the display device 100. Specifically, timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, and an effective period signal DataEnable for generating an image to be displayed are generated. The timing generation unit 102 also performs timing adjustment to match the frame rate and phase of the input video data.

  Reference numeral 103 denotes a display unit that performs display by projecting each frame image constituting the video data. The display unit 103 includes a liquid crystal panel, a panel drive circuit, a light source lamp, a prism, a projection lens, and the like, and performs display according to the timing of the synchronization signal of the timing generation unit 102.

  Reference numeral 104 denotes a dimming correction curve table, which stores a plurality of dimming correction curve data different from each other. Note that the data of the light attenuation correction curve may be stored as a lookup table, or may be sequentially calculated based on a calculation formula. A table selection unit 105 selects one dimming correction curve from a plurality of dimming correction curves stored in the dimming correction curve table 104 and outputs it.

  A table selection control unit 106 controls the table selection unit 105. Specifically, one dimming correction curve is selected from a plurality of dimming correction curves, and control is performed so that the selected dimming correction curve is output from the table selection unit 105. The table selection control unit 106 includes a CPU, a memory, and the like, and controls the table selection unit 105 when software stored in the memory is executed by the CPU. Reference numeral 107 denotes a dimming correction unit, which uses the dimming correction curve selected by the table selection unit 105 to perform dimming correction processing on each pixel in the overlapping region in each frame image constituting the video data. Do.

<2. Display system configuration>
Next, the display device 100 according to the present embodiment and the two display devices 110 and 120 having the same functional configuration as the display device 100 are arranged, and the images projected by the display devices 100 to 120 are combined to make 1 A display system that performs one display will be described.

  FIG. 2A is a block diagram illustrating an overall configuration of a display system including the display devices 100 to 120. Among these, the display device 100 is in charge of projecting the image of the left region 130 of the screen, and the display device 110 is in charge of projecting the image of the central region 131 of the screen. Further, the display device 120 is responsible for projecting the image of the right region 132 of the screen. Reference numeral 141 denotes a position where the image projected by the display device 100 and the image projected by the display device 110 overlap. Reference numeral 142 denotes a position where the image projected by the display device 110 and the image projected by the display device 120 overlap.

  FIG. 2B is a diagram illustrating an example of the light reduction correction process performed on the images projected by the display devices 100 to 120. Reference numeral 200 denotes a screen formed from an image projected by the display device 100, 210 denotes a screen formed from an image projected from the display device 110, and 220 denotes a screen formed from an image projected from the display device 120. Each is shown. The area 201 on the right side of the image forming the screen 200 overlaps the area 211 on the left side of the image forming the screen 210. Further, the area 212 on the right side of the image forming the screen 210 overlaps the area 221 on the left side of the image forming the screen 220.

  In the overlapping areas 201 and 211 and the overlapping areas 212 and 221, if each of the adjacent display devices projects an image having the same luminance, the luminance is doubled, and the joint is conspicuous. Therefore, a darkening correction process is performed on the images in these overlapping regions. Specifically, the luminance value at each position is weighted with respect to the image in the overlapping region by the light attenuation correction process so that the luminance of the image gradually decreases as the edge of the screen is approached. Note that the luminance value of the superimposed image is set to a constant value as much as possible by adding the weighting performed on the luminance value of each image of the adjacent display device at each position of the overlapping region, so that the luminance value of the superimposed image is Since it becomes equal to the luminance value, the joint can be made inconspicuous.

  FIG. 2C shows a state in which images projected by the display devices 100 to 120 are combined and displayed on the screen 230. As a result of the dimming correction process, the joints of the screens 200 to 220 become inconspicuous and can be displayed as one screen.

<3. Detailed explanation of dimming correction processing>
Next, details of the light reduction correction process will be described with reference to FIGS. The dimming correction process smoothly connects two images in the overlap area by gradually decreasing the brightness of one image and gradually increasing the brightness of the other image in a predetermined direction in the overlap area of the screen. To do. Here, the dimming correction curve used for the dimming correction processing is a curve representing the size of the weighting coefficient by which the pixel at each position is multiplied in the overlapping region.

  FIG. 3 is a diagram illustrating the shape of each attenuation correction curve included in the display device 100. The dimming correction curves 300 to 303 represent the dimming correction curves when the overlapping area is on the right side of the screen, such as the overlapping areas 201 and 212, for example. Each of the dimming correction curves has a shape that gradually decreases from the start position of the overlapping region to the end position (the right end position of the screens 200 and 210).

  The dimming correction curves have different shapes, the dimming correction curve 300 is close to the start position of the overlapping area, and the dimming correction curve 303 is close to the end position of the overlapping area. The weighting coefficients are defined so that the brightness drops sharply. That is, the dimming correction curves 300 to 303 have the weighting coefficients defined so that the positions where the brightness of the image sharply falls in the overlapping region are different from each other.

  FIG. 4 is a timing chart showing the switching timing for switching the dimming correction curve in the dimming correction process. In FIG. 4, reference numeral 400 denotes a vertical synchronization signal, which indicates a frame boundary of an image forming video data. The frame of the video data is switched at predetermined timings such as 1/60 seconds and 1/30 seconds.

  Reference numeral 401 denotes a time code, which is a sequence number for identifying each frame of video data. Each frame of video data is assigned a number in order. Reference numeral 402 denotes an identification number for identifying a dimming correction curve, which designates the dimming correction curve used for the dimming correction process.

  As shown in FIG. 4, in the display device 100 according to the present embodiment, the dimming correction curve is switched in accordance with the switching timing of each frame of the video data. For this reason, the table selection control unit 106 outputs a different identification number for each frame of video data.

  The identification number 402 output from the table selection control unit 106 is, for example, a remainder value obtained by dividing the value of the time code 401 by 4. In this case, the table selection unit 105 selects the dimming correction curve 300 with the identification number # 0 in the frame with the time code t = 20 and the dimming correction curve 301 with the identification number # 1 in the frame with t = 21. It becomes. That is, the dimming correction curves 300 to 303 with the identification numbers # 0 to # 3 are sequentially switched at the switching timing of the video data frames.

  FIG. 5 is a diagram showing a dimming correction curve used at each switching timing of video data frames. The dimming correction curve used for the dimming correction processing of the image of the overlapping area 201 and the image of the overlapping area 211 are illustrated. 7 shows a light reduction correction curve used in the light reduction correction process.

  As shown in FIG. 5, by combining a gradually decreasing attenuation correction curve and a gradually increasing attenuation correction curve in the overlapping region, even when a positional deviation or the like of the display device occurs, between adjacent pixels. It is possible to avoid a situation in which a portion having a large pixel value step occurs.

  In the present embodiment, among the plurality of overlapping regions, a dimming correction curve that gradually decreases in the overlapping region on the right side for each display device is used, and a dimming correction curve that gradually increases in a fixed shape is used in the overlapping region on the left side.

  Specifically, when the overlap area is on the right side of the screen, such as the overlap area 201 and the overlap area 212, the light attenuation correction curve used for the light attenuation correction processing of the image of the overlap area is switched. On the other hand, when the overlapping area is on the left side of the screen, such as the overlapping area 211 and the overlapping area 221, the dimming correction process is performed using one type of dimming correction curve having a fixed shape, and switching is not performed.

  In this way, by setting the gradual dimming correction curve to a fixed shape, the influence of the positional deviation of the display device can be suppressed without greatly changing the weighting unevenness even when the positional deviation of the display device occurs. It becomes possible.

  FIG. 5A shows a light attenuation correction curve used for the light attenuation correction process at time code t = 20. As shown in FIG. 5A, the display device 110 performs a light attenuation correction process on the image of the overlapping region 211 using a light attenuation correction curve 510 having a fixed shape. On the other hand, the display device 100 selects the light attenuation correction curve 300 with the identification number # 0 from the time code, and performs the light attenuation correction process on the image of the overlapping region 201 using the selected light attenuation correction curve 300.

  When the dimming correction curve 300 with the identification number # 0 is selected, a region where the weighting coefficient changes sharply in the direction from the overlapping region start position to the overlapping region end position is a position indicated by 500.

  FIG. 5B shows a light attenuation correction curve used for the light attenuation correction process at time code t = 21. As shown in FIG. 5B, the display device 100 selects the light attenuation correction curve 301 with the identification number # 1. For this reason, the region where the weighting coefficient changes sharply moves to the position indicated by 501.

  FIG. 5C shows a light attenuation correction curve used for light attenuation correction processing at time code t = 22. As shown in FIG. 5C, the display device 100 selects the light attenuation correction curve 302 having the identification number # 2. For this reason, the region where the weighting coefficient changes sharply moves to a position indicated by 502.

  FIG. 5D shows a light attenuation correction curve used for the light attenuation correction process at time code t = 23. As shown in FIG. 5D, the display device 100 selects the light attenuation correction curve 303 with the identification number # 3. For this reason, the region where the weighting coefficient changes sharply moves to the position indicated by 503.

  In this way, when performing dimming correction processing, by switching to a dimming correction curve of a different shape at the timing when each frame of the video data is switched, an area where the weighting coefficient of the dimming correction curve changes sharply is Each time the frame is switched, it moves. Thus, by changing the position of the weighted unevenness, the weighted unevenness can be made inconspicuous. Further, even when a positional deviation of the display device occurs, the influence of the positional deviation can be made difficult to be realized if the position of the weighted unevenness is changed.

  As described above, the display device 100 according to the present embodiment is configured to combine the light reduction correction curve that gradually decreases and the light attenuation correction curve that gradually increases in the overlapping region. As a result, it is possible to avoid a situation in which a gap (or overlap) is generated at the divided position due to a positional shift of the display device, and a portion having a large pixel value difference between adjacent pixels is generated as in the conventional case. It has become possible.

  Further, the display device 100 according to the present embodiment is configured to perform the dimming correction process by switching the dimming correction curve at the timing when each frame of the video data is switched in the overlapping region. As a result, it is possible to move a region where the weighting coefficient changes sharply at high speed, making the unevenness of the weighting less noticeable, and suppressing the influence of the positional deviation of the display device.

  As a result, it has become possible to improve the image quality in a display system that performs a single display by combining a plurality of projection type display devices.

  Note that the display device 100 according to the present embodiment is configured to perform the dimming correction process by switching only the dimming correction curve of a specific overlapping area among a plurality of overlapping areas in the screen. And according to the said structure, the incidental effect that it becomes possible to improve an image quality, without synchronizing a switching timing with another display apparatus is also acquired.

<4. Modification>
The present invention is not limited to the above-described embodiments, and can be widely applied.

  For example, in the above-described embodiment, the example in which the display devices are connected in the horizontal direction has been described. However, the present invention can be similarly applied even when the display devices are connected in the vertical direction. In the case of connection in the vertical direction, a dimming correction curve that gradually decreases (or gradually increases) in the vertical direction is used. Furthermore, it may be connected on the matrix in both the horizontal direction and the vertical direction instead of either the horizontal direction or the vertical direction.

  In the above-described embodiment, as the plurality of attenuation correction curves, the attenuation correction curves having different weighting coefficients at different positions are used. However, the present invention is not limited to this, and the steepness is further increased. Also, different dimming correction curves may be used.

  FIG. 6A shows a dimming correction curve group in which the steepness increases as the region where the weighting coefficient changes sharply approaches the start position of the overlap region and approaches the end position of the overlap region. FIG.

  Specifically, as shown in FIG. 6A, the attenuation correction curves 601 and 602 in which the region where the weighting coefficient changes sharply are located at the center have a shape with a small (gradual) steepness. . Further, the dimming correction curves 600 and 603 in which the area where the weighting coefficient changes steeply are close to the start position and the end position of the overlapping area have a shape with a large steepness.

  By using such a dimming correction curve, in addition to the position of the weighted unevenness, the degree of the weighted unevenness can be changed, so that the weighted unevenness can be made less noticeable.

  In the above-described embodiment, the plurality of light attenuation correction curves are selected in order. However, for example, the probability that the light attenuation correction curve is selected may be changed according to the steepness.

  In the above-described embodiment, a case has been described in which each of the plurality of light attenuation correction curves includes only one area where the weighting coefficient changes sharply. However, the light attenuation correction curve includes an area where the weighting coefficient changes sharply. May be included in a plurality of places.

  FIG. 6B shows an example of a dimming correction curve in which regions where the weighting coefficient changes sharply are included in a plurality of locations. In the example of FIG. 6B, there are regions where the weighting coefficient changes steeply at positions 612 and 613 in the dimming correction curve 611. By using such a dimming correction curve, the weighted irregularities are dispersed at a plurality of locations, so that it is possible to further suppress the influence of the positional deviation of the display device.

  In the above-described embodiment, the dimming correction curve is switched at the timing of switching the frame of the video data. However, the timing of switching the dimming correction curve may be arbitrarily changed.

  For example, a configuration may be adopted in which the intensity of movement of an object in video data is detected and the dimming correction curve is switched. Specifically, in the case of a slow moving image, the cycle for switching the dimming correction curve is lengthened, and in the case of a fast moving image, the cycle for switching the dimming correction curve is shortened. For example, it is changed so that it is normally switched every 1/60 seconds, and is switched every 1/30 seconds when the movement is slow.

  Note that the motion detection range at this time may be the entire image or may be limited to the periphery of the overlapping region.

[Second Embodiment]
In the first embodiment, in using the gradual attenuation correction curve and the incremental attenuation correction curve in the overlapping region, only the gradual attenuation correction curve is switched, and the incremental attenuation correction curve is switched. However, the present invention is not limited to this.

  For example, a configuration may be adopted in which both the gradual decrease dimming correction curve and the gradual dimming correction curve are switched in synchronization.

  In the first embodiment, the relationship between the shape of the gradual decrease dimming correction curve and the shape of the gradual increase dimming correction curve is not particularly mentioned. You may comprise so that it may become a complementary relationship with the shape of the gradual increase dimming correction curve. Details of this embodiment will be described below.

<1. Configuration of Projection Type Display Device>
First, the functional configuration of the projection display device (projector) according to the present embodiment will be described. FIG. 7 is a diagram illustrating a functional configuration of the display devices 700 and 710. The same components as those of the display devices 100 and 110 described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted here. A difference from the display devices 100 and 110 described in the first embodiment is a synchronization control unit 701.

  The synchronization control unit 701 is connected between the display devices 700 and 710 by communication means (not shown). Note that the communication means is configured by a general-purpose interface such as PCI, USB, and wireless LAN.

  The synchronization control unit 701 transmits a synchronization signal and a time code from the master display device 700 to the slave display device 710. The timing generation unit 102 of the slave display device 710 performs timing adjustment so as to operate in accordance with the synchronization signal and time code transmitted via the synchronization control unit 701. With the above configuration, the display device 700 and the display device 710 can be operated in synchronization with each other.

<2. Detailed description of synchronization operation between display devices>
Next, details of the synchronization operation of the display device 700 and the display device 710 will be described. FIG. 8 is a timing chart showing the state of the synchronization operation between the master display device 700 and the slave display device 710. In FIG. 8, signals 400 to 402 indicate switching timings of the vertical operation signal, the time code, and the identification number of the dimming correction curve of the master display device 700, respectively. As described with reference to FIG. 4 in the first embodiment, the time code 401 and the dimming correction curve identification number 402 are switched at predetermined timings when the vertical synchronization signal 400 is generated.

  On the other hand, signals 410 to 412 indicate the switching timing of the vertical operation signal, the time code, and the identification number of the dimming correction curve of the slave display device 710, respectively. A vertical synchronization signal 410 is transmitted from the master display device 700 via the synchronization control unit 701. A time code 411 is transmitted from the master display device 700 via the synchronization control unit 701. Reference numeral 412 denotes an identification number of the dimming correction curve, which is determined based on the time code 411. Since the vertical synchronization signal 410 and the time code 411 operate at the same switching timing as the master display device 700, the master display device 700 and the slave display device 710 change the switching timing of the respective light attenuation correction curves. Can be synchronized. Furthermore, since the time code is synchronized, the identification number of the dimming correction curve can also be synchronized between the display device 700 and the display device 710.

<3. Detailed explanation of dimming correction processing>
Next, details of the light reduction correction process will be described with reference to FIGS. 9 and 10. FIG. 9 is a diagram showing the shape of each dimming correction curve.

  Among these, FIG. 9A shows a light attenuation correction curve when the overlapping area is on the right side of the screen of each display device, for example, as in the overlapping areas 201 and 212. Note that the attenuation correction curve shown in FIG. 9A is the same as the attenuation correction curves 300 to 303 in FIG.

  FIG. 9B shows a dimming correction curve when the overlapping area is on the left side of the screen of each display device, for example, like the overlapping areas 211 and 221. The dimming correction curves 900 to 903 each have a shape that gradually increases from the end position of the overlapping area (the left end position of the screen 210 or 220) to the start position.

  However, the dimming correction curves 900 to 903 have different curve shapes. The dimming correction curve 900 is defined at a location near the end position of the overlapping area, and the dimming correction curve 903 is positioned at a position near the start position of the overlapping area. Yes. That is, the weighting coefficients are defined so that the dimming correction curves 900 to 903 are different from each other in the position where the brightness of the image sharply increases in the overlapping region.

  Further, the dimming correction curve 900 has a shape having a complementary relationship to the dimming correction curve 300, and is 1 when the weighting coefficients are added to each other at each position in the overlapping region. It is configured. Similarly, the dimming correction curve 901 has a shape having a complementary relationship with the dimming correction curve 301, and the dimming correction curve 902 has a complementary relationship with the dimming correction curve 302. It has a shape to have. Further, the dimming correction curve 903 has a shape having a complementary relationship with the dimming correction curve 303.

  For this reason, when the dimming correction curve 300 is selected in the display device 700, the dimming correction curve 900 is selected in the display device 710. Further, when the dimming correction curve 301 is selected in the display device 700, the display device 710 selects the dimming correction curve 901. Hereinafter, in the display device 700, when the dimming correction curves 302 and 303 are selected, the display device 710 selects the dimming correction curves 902 and 903.

  FIG. 10 is a diagram illustrating a darkening correction curve used at each switching timing of video data frames. The darkening correction curve used for the darkening correction processing of the image of the overlapping region 201 and the image of the overlapping region 211 are illustrated. 7 shows a light reduction correction curve used in the light reduction correction process.

  As shown in FIG. 10, even when a positional deviation of the display device or the like occurs by combining a dimming correction curve that gradually decreases and a dimming correction curve that gradually increases, the difference in pixel value between adjacent pixels It is possible to avoid a situation in which a large portion is generated.

  In the present embodiment, since a darkening correction curve having a complementary relationship is used, weighting unevenness can be completely eliminated in a state in which no positional deviation or the like of the display device has occurred. Can be realized.

  In the present embodiment, among the plurality of overlapping regions, a dimming correction curve that gradually decreases is used in the right overlapping region for each display device, and a dimming correction curve that is gradually increased is used in the left overlapping region. Then, the dimming correction curve used for the dimming correction process is switched at the switching timing of the video data frame. In the switching, for example, it is assumed that a darkening correction curve having an identification number of a remainder value obtained by dividing the time code value by 4 is selected.

  FIG. 10A shows a light attenuation correction curve used for the light attenuation correction process at time code t = 20. As shown in FIG. 10A, in the display devices 700 and 710, the light attenuation correction curves 300 and 900 having the identification number # 0 are selected, and the overlap regions 201 and 211 are used by using the light attenuation correction curves 300 and 900, respectively. The light reduction correction process of the image is performed.

  It should be noted that, by selecting the light attenuation correction curves 300 and 900 with the identification number # 0, each region where the weighting coefficient changes abruptly (that is, when a positional deviation occurs in the display device 700 or 710, the unevenness of weighting) Is a position indicated by 1000.

  FIG. 10B shows a light attenuation correction curve used for the light attenuation correction process at time code t = 21. As shown in FIG. 10B, in the display devices 700 and 710, the light attenuation correction curves 301 and 901 having the identification number # 1 are selected, and the overlap regions 201 and 211 are used by using the light attenuation correction curves 301 and 901, respectively. The light reduction correction process of the image is performed. For this reason, when a positional shift occurs in the display device 700 or 710, the region where the unevenness of weighting is conspicuous moves to the position indicated by 1001.

  FIG. 10C shows a light attenuation correction curve used for light attenuation correction processing at time code t = 22. As shown in FIG. 10C, in the display devices 700 and 701, the light attenuation correction curves 302 and 902 having the identification number # 2 are selected, and the overlap regions 201 and 211 are used by using the light attenuation correction curves 302 and 902, respectively. The light reduction correction process of the image is performed. For this reason, when a positional shift occurs in the display device 700 or 710, the region where the weighted unevenness is conspicuous moves to the position indicated by 1002.

  FIG. 10D shows a light attenuation correction curve used for the light attenuation correction process at time code t = 23. As shown in FIG. 10D, in the display devices 700 and 710, the light attenuation correction curves 303 and 903 having the identification number # 3 are selected, and the overlapping areas 201 and 211 are used by using the light attenuation correction curves 303 and 903, respectively. The light reduction correction process of the image is performed. For this reason, when a positional deviation occurs in the display device 700 or 710, the region where the weighted unevenness is conspicuous moves to the position indicated by 1003.

  As described above, the display devices 700 and 701 according to the present embodiment are configured to select the dimming correction curves having a complementary relationship synchronously in the overlapping region. Accordingly, as in the first embodiment, a gap (or overlap) is generated at the divided position due to the positional deviation of the display device as in the related art, and there is a portion where the difference in pixel value is large between adjacent pixels. It has become possible to avoid such a situation. In addition, weighting irregularities can be completely eliminated in a state where the display device is not displaced, and high image quality can be realized.

  Further, the display devices 700 and 710 according to the present embodiment are configured to perform the light reduction correction process by switching the light reduction correction curve at the timing when each frame of the video data is switched in the overlapping region. This makes it possible to quickly move an area where weighted irregularities are conspicuous when a positional deviation occurs in the display device 700 or 710, and to make the weighted irregularities caused by the positional deviation less noticeable. It became.

  As a result, it has become possible to improve the image quality in a display system that performs a single display by combining a plurality of projection type display devices.

<4. Modification>
The present invention is not limited to the above-described embodiments, and can be widely applied.

  For example, the dimming correction curve may be selected with a random number. Specifically, a random number is generated in the master display device 700, and the generated random number value or the identification number of the attenuation correction curve to be selected is transmitted to the slave display device 710. In the slave display device 710, the dimming correction curve is selected according to the random number value generated by the master display device 700 or the identification number of the dimming correction curve to be selected. The correction curve can be switched.

  Note that the master device does not have to be a display device, and may be a device such as a genlock generator that distributes and outputs a synchronization signal.

[Third Embodiment]
In the first embodiment, the dimming correction curve is switched at the timing of switching the frame of the video data. However, the present invention is not limited to this. For example, the dimming correction curve may be switched at the timing when an event (vibration of the display device or the screen 230) that causes a shift in the image display position occurs. Details of this embodiment will be described below.

<1. Configuration of Projection Type Display Device>
First, the functional configuration of the projection display device (projector) according to the present embodiment will be described. FIG. 11 is a diagram illustrating a functional configuration of the display devices 1100 and 1100. In addition, the same number is attached | subjected about the component same as the display apparatus 100,110 or 700,710 demonstrated in the said 1st and 2nd embodiment, and description is abbreviate | omitted here. A difference from the display devices 700 and 710 described in the second embodiment is a vibration detection unit 1101.

  The vibration detection unit 1101 includes a vibration sensor, a detection circuit, and a control circuit, and detects that a shake has occurred in the housing of the display device 1100. If shaking occurs, the table selection control unit 106 is notified.

<2. Flow of dimming correction processing>
Next, the flow of dimming correction processing in the display device 1100 will be described. FIG. 12 is a flowchart showing the flow of the shake attenuation correction process in the display device 1100.

  As shown in FIG. 12, in step S1201, the vibration detection unit 1101 is controlled to detect shaking of the housing of the display device 1100. In step S1202, it is determined whether or not there is a shake. If it is determined that there is a shake, the process proceeds to step S1203. On the other hand, if it is determined that there is no shaking, the process proceeds to step S1204.

  In step S1203, the dimming correction curve is switched as in the first or second embodiment, and the process returns to step S1201. On the other hand, in step S1204, the light attenuation correction curve is set to a fixed shape, and the process returns to step S1201.

  By performing the above processing, when the casing of the display device 1100 or 1110 is shaken, it is possible to perform processing for switching the dimming correction curve.

  As described above, the display device 1100 according to the present embodiment has a configuration in which the vibration detection unit that detects the shaking of the housing is arranged and the dimming correction curve is switched when the shaking of the housing is detected. . As a result, it is possible to suppress the influence of the position shift of the display device and the like, to improve the image quality, and to reduce power consumption.

<3. Modification>
The present invention is not limited to the above-described embodiments, and can be widely applied.

  For example, in the present embodiment, the dimming correction curve is switched by detecting the shaking of the display device, but the dimming correction curve may be switched by detecting the shaking of the screen 230 that projects the image. . In this case, a vibration sensor may be attached to the screen 230, the output of the vibration sensor may be taken into the display device 1100, and the dimming correction curve may be switched when the vibration sensor on the screen 230 detects shaking. Alternatively, the screen 230 may be imaged with a camera or the like, and shaking may be detected by image analysis.

[Other Embodiments]
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program. It is a process to be executed.

Claims (12)

A display device that projects and displays an image,
Storage means for storing a plurality of correction curves that change the brightness from a predetermined position of the image to an edge of the image, and that cause different changes;
Control means for changing the luminance from a predetermined position of the image to an edge of the image using a correction curve selected by switching at a predetermined timing from a plurality of correction curves stored in the storage means A display device comprising:   The display device according to claim 1, wherein the correction curve is a curve in which a weighting coefficient gradually decreases or gradually increases from a predetermined position of the image toward an end portion of the image.   3. The display according to claim 2, wherein the plurality of correction curves are different from each other in a position where the weighting coefficient changes sharply from a predetermined position of the image toward an end portion of the image. apparatus.   The control means changes a luminance from a predetermined position of the image to an end portion of the image using a correction curve that is switched and selected at each timing according to the timing of switching the frame of the image. The display device according to claim 1.   The control means changes a luminance from a predetermined position of the image to an end portion of the image using a correction curve selected by switching at each timing according to the speed of movement of the object included in the image. The display device according to claim 1.   The control means changes the luminance from a predetermined position of the image to the edge of the image using a correction curve that is switched and selected at every timing at which vibration that causes a positional deviation of the projected image is detected. The display device according to claim 1.   The said control means detects the vibration which produces the said position shift based on the signal from the vibration sensor distribute | arranged to the screen on which the said display apparatus or the said image is projected. Display device.   The display device according to claim 1, wherein the control unit selects a correction curve based on a random number value from a plurality of correction curves stored in the storage unit. An area from a predetermined position of the image to an edge of the image is an area overlapping with an image projected by another display device,
9. The control unit according to claim 1, wherein the control unit selects a correction curve having a complementary relationship with the correction curve selected by the other display device in synchronization with the other display device. The display device according to claim 1.   The control means corrects a predetermined fixed shape for a region that is different from a region from a predetermined position of the image to an edge of the image and overlaps an image projected by another display device. The display device according to claim 1, wherein the luminance of the region is changed using a curve. A display device that projects and displays an image, and stores a plurality of correction curves that change a luminance from a predetermined position of the image to an end portion of the image and cause different changes from each other. A control method for a display device comprising storage means,
A control step of changing the luminance from a predetermined position of the image to an end portion of the image using a correction curve selected by switching at a predetermined timing from a plurality of correction curves stored in the storage means A control method for a display device, comprising:   A program for causing a computer to function as each unit of the display device according to any one of claims 1 to 10.