JP5280948B2 - Image display device, light intensity correction data generation device, and light intensity correction data generation method - Google Patents

Description

  The present invention relates to a video display device in which light-emitting display elements such as LEDs and fluorescent display tubes are arranged as pixels to form a display surface, and in particular, the display surface is reduced by reducing variations in luminous intensity in the light-emitting display elements for each pixel. The present invention relates to a control technique for displaying the image with uniform brightness over the entire area and a technique for generating light intensity correction data.

  A conventional video display device includes a nonvolatile memory, a driver IC and a control IC mounted on each LED unit in which LEDs (light emitting diodes) are arranged in a matrix, and a control device connected to the control IC of each LED unit. Based on the brightness correction parameters (LED light distribution characteristics, LED unit size, LED dot pitch, LED display size, angle to look up) stored in the nonvolatile memory in advance Even when the size of the camera is large and the angle from the viewing position to the top and bottom or left and right edges is significantly different, the optimal light emission brightness (light emission intensity) is calculated to eliminate overall brightness unevenness and improve image quality. It was improved.

Japanese Patent Laying-Open No. 2003-271104 (FIG. 1)

However, the conventional video display device provides a function that makes the luminance seen from a specific viewing point, that is, a single spectator uniform, for example, a public stadium such as a racetrack, a baseball field, a soccer field, etc. In the stadium, there is a problem that the viewing point is unspecified, and it is impossible to display with uniform luminance for an unspecified number of audience areas.
In addition, when all the pixels are driven under the same conditions, the light-emitting display element is not uniform in the display on the screen due to variations in light emission intensity of each light-emitting display element, and appears to be rough over the entire screen. There was a problem. In order to prevent such a problem, it is necessary to perform light intensity correction of the light emitting display elements in order to absorb variations in the light emission intensity of each light emitting display element in the element driving means for driving the light emitting display elements. In the conventional video display device, similarly to the above, for one spectator who is a specific viewing point, the variation in the luminous intensity of the light emitting display element for each pixel, that is, the roughness of the video display quality is reduced. There was a problem that the video could not be displayed.

  The present invention relates to an image display device that reduces the unevenness of image display quality by reducing variations in luminous intensity in light emitting display elements for each pixel for an arbitrary position, arbitrary viewing direction, that is, an unspecified number of spectators. The purpose is to provide.

The video display device according to the present invention includes a storage means for storing luminous intensity correction data for correcting the luminous intensity of each luminous display element, and luminous display element driving data for setting the luminous display element to a predetermined luminous intensity based on the luminous intensity correction data. And a driving means for driving the light emitting display element based on the light emitting display element driving data. The luminous intensity correction data includes correction data in a plurality of viewing directions, and the arithmetic control unit changes the correction data in the plurality of viewing directions at a predetermined cycle based on the viewing direction setting information from the control center , and the respective viewing directions. The light emitting display element drive data for setting the light emitting display element to a predetermined light emission intensity is generated using the correction data in (1).

  The video display device according to the present invention reduces the variation in the luminous intensity of the light emitting display element for each pixel to any position, arbitrary viewing direction, i.e., an unspecified number of spectators, and provides a rough feeling of video display quality. Can be reduced.

It is a figure which shows the structure of the display module of the video display apparatus in Embodiment 1 of this invention. 3 is a diagram illustrating a screen layout of the video display device in Embodiment 1. FIG. It is a figure which shows the visual recognition direction angle (horizontal direction) of the video display apparatus of FIG. It is a figure which shows the visual recognition direction angle (vertical direction) of the video display apparatus of FIG. It is a figure which shows the memory mapping example (horizontal direction) of the luminous intensity correction data of the video display apparatus of FIG. It is a figure which shows the memory mapping example (vertical direction) of the luminous intensity correction data of the video display apparatus of FIG. It is a conceptual diagram of the production | generation method of the luminous intensity correction data in the video display apparatus of FIG. It is a figure which shows the target value of the display surface brightness | luminance of the video display apparatus of FIG. It is a figure which shows the directional characteristic of the display element in the video display apparatus of FIG. It is a figure explaining the change of the viewing angle in the video display apparatus of FIG. It is a figure explaining the viewing angle of the video display apparatus of FIG. It is a figure which shows the dynamic change order of the luminous intensity correction data of the video display apparatus in Embodiment 2 of this invention. It is a figure explaining the production | generation method of the luminous intensity correction data of the video display apparatus in Embodiment 3 of this invention. FIG. 10 is a diagram illustrating a configuration of a light intensity correction data generation device of a video display device according to Embodiment 3. FIG. 10 is a diagram for explaining emission luminous intensity directivity characteristics of a video display device in a third embodiment. FIG. 10 is a diagram showing another configuration of the light intensity correction data generating device of the video display device in the third embodiment.

Embodiment 1 FIG.
1 is a diagram showing a configuration of a display module of a video display device according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing a screen layout of the video display device. The video display device 1 is configured by arranging and connecting a plurality of display modules 2 in a matrix, and the display module 2 is configured with a control unit 7 by arranging and connecting a plurality of display panels 3 in a matrix. The panel 3 is configured by arranging and connecting a plurality of light emitting display elements 4 in a matrix form, and constitutes an image display surface.

  The video display device 1 is connected to the control center 13. The video display device 1 receives setting information Csig such as a setting command via the setting information signal line 15 and receives video signal data Data via the image signal data signal line 14 to display a video.

  The display surface of the display module 2 indicated by a broken line circle 20 in FIG. 2 is configured by arranging 16 display panels 3 indicated by a broken line circle 21, for example. As shown in FIG. 1, the display module 2 includes 16 display panels 3a1 to 3a4 (first row), 3b1 to 3b4 (second row), 3c1 to 3c4 (third row) arranged in 4 rows and 4 columns, 3d1 to 3d4 (fourth row).

  The display panel 3 includes a light-emitting display element 4 including a plurality of LEDs (for example, a pixel arrangement of 16 dots × 16 dots), a fluorescent display tube, a display element driver 5 for driving the light-emitting display element 4, and the light-emitting display element 4. A non-volatile memory 6 which is a storage means for storing luminous intensity correction data used for correcting variation in luminous intensity of each pixel. The luminous intensity correction data has a data amount corresponding to the number of pixels (for example, 16 dots × 16 dots) included in each display panel 3.

  The control unit 7 includes a microcomputer 8, a correction value memory 9, a video memory 10, and an arithmetic controller 11. The control unit 7 receives the setting information Csig and the video signal data Data from the control center 13 and generates light emitting display element driving data in which the light emission intensity is corrected for each light emitting display element 4 based on the setting information Csig. It transmits to the display panel 3.

  The microcomputer 8 is arranged outside the video display device 1 and receives the setting information Csig from the upper control center 13 to control the display function of the display module 2 and the non-volatile memory 6 of the display panel 3. Communication control such as transmission / reception of luminous intensity correction data is performed.

  The correction value memory 9 is a RAM, for example, and stores light intensity correction data having a data amount corresponding to the total number of pixels of the display module 2. The light intensity correction data temporarily stored in the correction value memory 9 is data read from the nonvolatile memory 6 and expanded by the microcomputer 8 via the arithmetic controller 11. Luminous intensity correction for absorbing the variation in luminous intensity of the light emitting display element 4 is performed over all pixels, that is, all the light emitting display elements 4. All the display panels 3 each have a nonvolatile memory 6, and all the light intensity correction data stored in each nonvolatile memory 6 are developed in a correction value memory 9.

  The video memory 10 is, for example, a RAM, and video signal data Data having a data amount corresponding to the total number of pixels included in the display module 2 is input from the control center 13 via the arithmetic controller 11, and this video signal data Data Is temporarily stored.

  The arithmetic controller 11 uses the video signal data Data stored in the video memory 10 and the light intensity correction data stored in the correction value memory 9 on the display panel 3 in order to absorb variations in the light emission intensity of the light emitting display element 4. The light emission intensity of all the light emitting display elements 4 is calculated to be constant, and driver drive data for driving the display element driver 5 is generated.

Next, an example of calculation for absorbing the variation in luminous intensity will be described. For example, let us consider a case where the A element which is one of the light emitting display elements 4 has an emission luminous intensity of “a”, and the other B element has an emission luminous intensity of “b”. When the target luminous intensity of the light emitting display element 4 in the display panel 3 is “c”, the A element is ya times the target luminous intensity, and the B element is yb times the target luminous intensity, It is necessary to perform a correction of / ya times, and it is necessary to perform a correction of 1 / yb times for the B element. Specifically, assuming that the correction value data Xa of the A element and the correction value data Xb of the B element are 10-bit (1024 maximum) operation data, and a half of a numerical value obtained by converting a 10-bit binary number to a decimal number, That is, if 512 is a condition of correction = 1 time (no correction), the light emission intensity of the A element and the B element may be set to “c” by satisfying the expressions (1) and (2), respectively.
c = a × Xa / 512 (1)
c = b × Xb / 512 (2)

Therefore, the equations (1) and (2) are modified, and the correction value data Xa and Xb are obtained by the following equations (3) and (4).
Xa = c / a × 512 (3)
Xb = c / b × 512 (4)
For example, when the A element is 1.5 times the target light intensity and the B element is 1/2 time the target light intensity, the A element is corrected by 1 / 1.5 times and the B element is corrected. Performs a double correction. In this example, the correction value data Xa and Xb are 341 and 1024, respectively.

  The arithmetic controller 11 reads out data for driving a desired light emitting display element 4 from the video signal data Data stored in the video memory 10 and the light intensity correction data stored in the correction value memory 9 at synchronized timings. Then, the driver drive data for driving the desired light emitting display element 4 is generated by performing an operation on each read data, and is transmitted to any one of the corresponding display panels 3. This read operation and calculation operation are performed for all the light emitting display elements 4 by sequentially advancing the memory addresses of the video memory 10 and the correction value memory 9 corresponding to the light emitting display elements 4. Thereby, display driving is performed on all the light emitting display elements 4 included in all the display panels 3 in the display module 2 constituting the video display device 1.

  In the image display device 1 configured as described above, the luminous intensity correction data of the light emitting display element 4 is collected in all viewing directions or in a plurality of representative viewing directions, and the luminous intensity data collected in a plurality of representative viewing directions is a plurality of luminous intensity correction data having different viewing directions. The light intensity correction data is stored in the nonvolatile memory 6 in the display panel 3 or the correction value memory 9 in the control unit 7. By using the light intensity correction data, light emission display element drive data in which the light emission intensity is corrected for each light emitting display element 4 is generated, and the light emission display element 4 is controlled, so that any desired (desired) viewing directions can be obtained. However, it is possible to correct the variation in light emission intensity for each pixel of the light emitting display element 4 and to reduce the rough feeling of the image display quality.

  Next, a plurality of light intensity correction data will be described. For example, the plurality of luminous intensity correction data are data in the two-dimensional viewing direction in the horizontal direction and the vertical direction for each light emitting display element 4. As a viewing direction specification of a general large-sized image display device, for example, a specification of ± 60 ° is presented in the left-right direction in the horizontal direction, and −30 ° in the looking-up (negative notation) direction in the vertical direction. In the direction of looking down, a specification of + 15 ° is presented. Intensity correction data in a range satisfying this viewing direction specification is prepared. For example, as shown in FIGS. 3 and 4, the plurality of light intensity correction data are collected and generated in increments of 10 ° in the above-described viewing direction specification.

  An example of memory mapping of light intensity correction data in the case where the display panel 3 has pixels of 16 dots × 16 dots and each pixel is composed of light emitting display elements 4 of three colors is shown. FIG. 5 is a diagram showing an example of horizontal memory mapping in the luminous intensity correction data, and FIG. 6 is a diagram showing an example of vertical memory mapping in the luminous intensity correction data. The luminous intensity correction data is divided into address areas in each viewing direction (angle), and red (R), green (G), and blue (B) luminous intensity correction data for every dot is regularly arranged. Since a pixel of 16 dots × 16 dots has 256 light emitting display elements 4 of each color, there are 768 addresses in one viewing direction. The address of the luminous intensity correction data in the horizontal direction is from H1 to H9984 as shown in FIG. 5, and the address of the luminous intensity correction data in the vertical direction is from V1 to V4608 as shown in FIG.

  A method of generating light intensity correction data in an arbitrary viewing direction will be described with reference to FIG. FIG. 7A is a conceptual diagram for combining the light intensity correction data in the horizontal direction and the light intensity correction data in the vertical direction, and FIG. 7B is a light intensity correction at the intersection coordinates in the horizontal direction and the vertical direction in FIG. It is a figure which shows the display position of data. In FIG. 7A, the vertical axis indicates the angle in the vertical direction, and the horizontal axis indicates the angle in the horizontal direction. As indicated by circles A, B, and C in FIG. 7A, the light intensity correction data at the intersections in the horizontal direction and the vertical direction are obtained as average values of the respective points. Here, the light intensity correction data at the intersections in the horizontal direction and the vertical direction are referred to as intersection light intensity correction data (horizontal direction and vertical direction). The intersection light intensity correction data in the viewing direction of the horizontal direction + 40 ° and the vertical direction + 20 ° indicated by the circle A is (384, 482), and the light intensity correction data in the viewing direction indicated by the circle A is 433 on average. . Similarly, the luminous intensity correction data in the viewing direction indicated by a circle B is 256, and the luminous intensity correction data in the viewing direction indicated by a circle C is 497 (rounded down). The averaging method is not limited to rounding down after the decimal point, but may be rounded off or rounded up. Further, not only the averaging but also a weighting coefficient may be added and combined.

The target value of the absolute element light intensity at each intersection is determined in advance. Then, the light intensity correction data in the vertical viewing direction and the horizontal viewing direction are derived. In deriving the luminous intensity correction data, the target value of the absolute luminous intensity is given as the surface luminance of the video display device 1, and this surface luminance is obtained by using a plurality of light emitting display elements 4 mounted on the display panel 3 as a surface. It measures and is generally used as a unit of cd (candela) / m ² . The general specifications for the surface luminance in the video display device 1 are given specifications such as 5000 cd / m ² at the front, in the maximum specified viewing direction described above, the specifications such as 2500 cd / m ² which is a half-value It is used. Therefore, the target luminous intensity is determined as the surface luminance of the video display device 1 shown in FIG. Surface luminance of the image display device 1, the central and 5000 cd / m ^2, in accordance with will shift to the angle around the viewing direction, at a relative proportion such linearly luminance to 2500 cd / m ² is lowered decide.

  Here, as the viewing direction is wider (peripheral portion of the video display device 1), the surface luminance of the video display device 1 decreases because the characteristics of the light emitting display element 4 itself have directional characteristics as shown in FIG. It is because it is doing. Such characteristics of the light emitting display element 4 are referred to as directional characteristics.

  A method for changing the viewing angle of the video display device 1 will be described. FIG. 10 is a diagram illustrating a change in the viewing angle of the video display device. An A stand 25, a B stand 26, and a C stand 27 that can accommodate a plurality of audiences with different viewing directions are installed for one large-sized video display device 1. When the B stand 26 is regarded as important, the B stand 26 is provided. Luminosity correction data for the viewing direction 23 corresponding to is set. In addition, when an important person is included in the A stand 25 and it is desired to improve the image quality with respect to the A stand 25, the light intensity correction data corresponding to the angle of the viewing direction 22 with respect to the A stand 25 is selected. When it is desired to improve the image quality with respect to the C stand 27, the light intensity correction data corresponding to the angle of the viewing direction 24 with respect to the C stand 27 is selected. Since the vertical direction is the same, the description is omitted. Even if the viewing angle of the video display device is set to any one of the A stand 25, the B stand 26, and the C stand 27, when viewed from the other two stands, the selected stand has improved video quality. However, the image quality is slightly lower than it is, and is not greatly reduced, and is within an allowable range.

  Even in any desired viewing direction of the desired representative viewing direction, it is possible to correct the variation in luminous intensity for each pixel of the light-emitting display element, and to variably set the best video display quality. The video display quality can be improved by reducing the image quality.

  Luminous intensity correction data in which the angle of the viewing direction with respect to the display panel 3 in the video display device 1 of Embodiment 1 is constant for each display panel 3 can be used. This will be described with reference to FIG. FIG. 11 is a diagram for explaining the viewing angle of the video display device 1. As described above, the large video display device 1 is mainly installed in public stadiums such as a racetrack, a large stadium such as a baseball stadium, and a soccer field, and the distance D1 from the audience to the video display device 1 is approximately 100 m. Usually, the distance is about 200 m. For example, the angle differences θ1 and θ2 for simultaneously viewing the top and bottom of the video display device 1 having a height H1 of 10 m from the stand upper part P1 and the lower part P2 having a stand height H2 of 20 m are approximately 5 °. . Differences θ3 and θ4 between the angles viewed from the stand above and below the video display device 1 are also about 5 °. These differences in angle are not large differences, and do not cause roughness to deteriorate the video display quality.

Since the display panel 3 is narrower than the entire area of the video display device 1 as shown in FIG. 2, the difference in the angle at which the spectator visually recognizes the top, bottom, left and right of the display panel 3 is shown in FIG. The angle difference is smaller than θ1 and θ2. Accordingly, the angle of the viewing direction in the light intensity correction data is the same for each display panel 3, and the correction data is set at the viewing direction angle desired to be optimal, so that it is almost optimal for the majority of the audience. It can be considered a setting. In other words, the image display quality can be optimized for the majority of the audience without causing roughness.

  The same applies to the horizontal direction. For a stand having a wide horizontal width, the difference in the angle at which the left and right sides of the video display device 1 are simultaneously viewed may be considered for each stand area in a range that does not cause roughness and reduce the video display quality. In such a stand region, as described above, the angle of the viewing direction in the light intensity correction data is the same for each display panel 3, and the correction data is set with the angle of the viewing direction desired to be optimal, It can be considered as an optimal setting for the majority of the audience. In other words, the image display quality can be optimized for the majority of the audience without causing roughness.

  If the difference in the angle for simultaneously viewing the upper and lower sides of the image display device 1 and the difference in the angle for simultaneously viewing the left and right sides are within an angle that does not cause roughness and reduce the image display quality, all of the images in the image display device 1 are displayed. Luminous intensity correction data in which the angle of the viewing direction with respect to the display panel 3 is constant can be used. In this case, an instruction command for generating light emitting display element drive data in which the luminous intensity is corrected for each light emitting display element 4 in the control unit 7 can be facilitated, and processing in the microcomputer 8 can be reduced.

  As described above, the video display apparatus according to Embodiment 1 stores the light intensity correction data for correcting the luminous intensity of each light emitting display element 4 and the light emitting display element 4 emits predetermined light based on the light intensity correction data. A calculation control unit 7 for generating light emitting display element driving data for light intensity and driving means 5 for driving the light emitting display element 4 based on the light emitting display element driving data are provided, and the light intensity correction data is correction data in a plurality of viewing directions. Since the calculation control unit 7 generates the light emitting display element drive data using the correction data in the corresponding viewing direction based on the viewing direction setting information Csig from the control center 13, the arbitrary position, the arbitrary viewing direction In other words, for a large number of unspecified audiences, the variation in the luminous intensity of the light emitting display element for each pixel is reduced, and the image display quality is improved. It is possible to reduce the Ruzaratsuki feeling.

  Since the brightness correction data includes correction data in the horizontal direction and the vertical direction of the video display device 1, the brightness correction data in an arbitrary viewing direction within the horizontal and vertical ranges stored in the nonvolatile memory 6 is It can be obtained by combining the luminous intensity correction data in the direction and the luminous intensity correction data in the vertical direction. Since the light intensity correction data in an arbitrary viewing direction is synthesized from the light intensity correction data in the horizontal direction and the light intensity correction data in the vertical direction, the capacity of the nonvolatile memory 6 is larger than that in the case of storing all the light intensity correction data in the arbitrary viewing direction. Can be reduced.

Embodiment 2. FIG.
In the first embodiment, the configuration and function for improving the video display quality in the arbitrary viewing direction are described. However, the video display device 1 in the second embodiment does not continue the setting optimized for one arbitrary viewing direction. Instead, the video display quality in each of the specified viewing directions can be improved by dynamically changing the setting optimized for the plurality of specified viewing directions at a slight sacrifice. This will be described below.

FIG. 12 is a diagram showing the dynamic change order of the light intensity correction data of the video display apparatus according to Embodiment 2 of the present invention. The columns in FIG. 12 are horizontal viewing direction angles, and the rows are vertical viewing direction angles. The numbers described in the rows and columns indicate the order in which the light intensity correction data is used. In the example of FIG. 12, first, intersection light intensity correction data (−60 °, + 20 °) is used as light intensity correction data (horizontal direction, vertical direction). After a predetermined period T has elapsed, the light intensity correction data is changed to second intersection light intensity correction data (−40 °, + 20 °). Every time the predetermined period T elapses, the light intensity correction data is changed in order, and the 42nd intersection light intensity correction data (−60 °, −30 °) is reached. After that, it returns to the first and repeats sequentially. The light intensity correction data is changed by the microcomputer 8. A cycle change table (early cycle, late cycle, etc.) describing the order of change of the light intensity correction data as shown in FIG. 12 is implemented in a program executed by the microcomputer 8. The program sets luminous intensity correction data in the arithmetic controller 11 according to the selected period change table. Note that the selection of the period change table to the microcomputer 8 is performed by an instruction from the control center 13.

  The change order is set so that the change rate of the data to be changed is small. In the first to seventh changes, the vertical direction is the same + 20 °, and the horizontal direction is changed. The seventh to eighth changes remain the same at + 60 ° in the horizontal direction and change only the vertical direction. The eighth to fourteenth changes are + 10 ° in the same vertical direction, and change the horizontal direction. Change in the same way. Therefore, it is possible to provide better video display quality without causing each audience watching the video display device to recognize that the video quality has changed significantly.

  The period T for changing the light intensity correction data will be described. As an example when the period T is early, the first to 42nd changes in FIG. 12 are executed in 16.66 ms or less (60 Hz or more). In this case, the period T is 16.66 ms / 42 or less. By changing the light intensity correction data with a period T of 16.66 ms / 42 or less, it is possible to reduce the feeling of roughness that is a better image display quality in all viewing directions while suppressing the flicker phenomenon of the image. When the refresh rate, which is the rewrite frequency of the display screen, decreases, the human recognizes the flicker phenomenon with respect to a video having a low refresh rate of 60 Hz or less. Therefore, all data changes in the light intensity correction data set (No. 1 to 42) are performed at a frequency of 60 Hz or higher, and the display screen is rewritten based on the changed light intensity correction data to suppress the flicker phenomenon. You can

  The period T can be delayed. For example, the period T is set to 10 s, and the setting is changed with a small number of settings, such as horizontal −20 °, 0 °, + 20 °, vertical + 10 °, 0 °, and −10 °. Although the change of the light intensity correction data is slower than the above-described early cycle, the display screen can be rewritten at 60 Hz or more to suppress the flicker phenomenon of the video. In this case, it is possible to obtain a video display quality that is better in all viewing directions while the state of the best video display quality for an arbitrary audience is relatively long.

  As described above, the video display device 1 according to the second embodiment dynamically changes the viewing direction of the entire video display device 1 and corrects the luminous intensity of the light emitting display element 4 based on the luminous intensity correction data of each visual direction. By doing so, it is possible to reduce the rough feeling that is a better image display quality in all viewing directions.

Embodiment 3 FIG.
In the third embodiment, a light intensity correction data generating apparatus and a light intensity correction data generating method for generating light intensity correction data applied to the video display device 1 of the first or second embodiment will be described. Before assembling the video display device 1, brightness correction data is generated for each display panel 3. FIG. 13 is a diagram for explaining a method of generating light intensity correction data of the video display apparatus according to Embodiment 3 of the present invention. The display panel 3 is fixed to the panel base 37 (see FIG. 14), and the camera 12 is arranged so as to face the display surface of the display panel 3. The camera 12 is a light intensity measuring unit that measures the light emission intensity of the light emitting display element 4. An arrow 28 indicates the measurement direction A, and arrows 29 and 30 indicate the measurement direction B and the measurement direction C, respectively. One of the display panel 3 and the camera 12 is moved, that is, the display panel 3 and the camera 12 are moved to a predetermined relative position, and the luminous intensity of the light emitting display element 4 is measured. The display panel 3 and the camera 12 are moved to relative positions corresponding to all viewing directions, and the luminous intensity of the light emitting display element 4 is measured to collect the luminous intensity with respect to the entire viewing direction of the light emitting display element 4. be able to.

  A case where the display panel 3 is moved will be described. FIG. 14 is a diagram showing a configuration of a light intensity correction data generating device of the video display device. As a procedure 1, the display panel 3 is moved by a panel moving device 35 as a moving means in accordance with an instruction from the computer 34, and the luminous intensity measurement direction of the light emitting display element 4 is set in the horizontal and vertical directions with respect to the light emitting display element 4 to be measured. Is set to a predetermined angle. As a procedure 2, a test signal for causing the light emitting display element 4 to emit light is transmitted from the control unit 7 to the display element driver 5 of the display panel 3 according to an instruction from the computer 34. As procedure 3, the camera 12 measures the luminous intensity of the light emitting display element 4 to be measured, and transmits the measurement data to the computer 34. The computer 34 calculates the light intensity correction data using the equation (3) based on the measurement data and the target light intensity of the light emitting display element 4 and stores the light intensity correction data in the nonvolatile memory 6 via the control unit 7. Thereafter, the procedure returns to Procedure 1 to change to the next measurement angle, and Procedure 2 and Procedure 3 are executed. After the light intensity correction data in all viewing directions for the target light emitting display element 4 is generated, the measurement object is changed to another light emitting display element 4 to generate the light intensity correction data. Here, the computer 34 is a movement control means for controlling the movement means, is a light emitting panel control means for issuing a command to the control unit 7, and is a calculation means for calculating the light intensity correction data.

  FIG. 15 is a diagram for explaining the luminosity directivity characteristics of the video display device, and shows images of the directional characteristics before and after correction of the light emitting display elements A and B having two types of luminosity characteristics. The luminous intensity characteristic 31 is a characteristic before correction of the light emitting display element A, and the luminous intensity characteristic 32 is a characteristic before correction of the light emitting display element B. The luminous intensity characteristic 33 is a characteristic after correction of the light emitting display elements A and B. The range in which the directivity of the luminous intensity is matched by the correction is the range of the viewing direction specification of the large video display device. For example, the horizontal direction is ± 60 ° in the left-right direction, and the vertical direction is −30 ° in the look-up (minus notation) direction and + 15 ° in the look-down direction. After the correction, the same characteristics can be obtained with respect to the arbitrary viewing direction, that is, the viewing characteristic angle.

  As described above, the light intensity correction data generation device and the light intensity correction data generation method according to Embodiment 3 can generate light intensity correction data of the video display device 1 with high accuracy. By using this highly accurate luminous intensity correction data, the video display device 1 can reduce variations in luminous intensity in the light emitting display element for each pixel with respect to an arbitrary position, an arbitrary viewing direction, that is, an unspecified number of spectators. Further, it is possible to reduce the feeling of roughness that is the image display quality.

  In addition, although the example which memorize | stores every time the luminous intensity correction data with respect to one visual recognition direction was produced | generated when storing luminous intensity correction data in the non-volatile memory 6, after the luminous intensity correction data of all visual recognition directions was produced | generated. The brightness correction data may be stored in the nonvolatile memory 6 at once. Further, the light intensity correction data may be stored in the nonvolatile memory 6 after reaching a predetermined number of data.

  Although the case where the display panel 3 is moved has been described, the camera 12 may be moved. FIG. 16 is a diagram showing another configuration of the light intensity correction data generating device of the video display device. In the light intensity correction data generation method described above, the camera 12 is moved by the camera moving device 36 according to an instruction from the computer 34, and the light intensity measurement direction of the light emitting display element 4 is set in the horizontal and vertical directions with respect to the light emitting display element 4 to be measured. Is set to a predetermined angle (procedure 1). Other procedures are the same as those described above.

The image display device, the light intensity correction data generation device, and the light intensity correction data generation method according to the present invention are suitable for a large-screen image display device installed in a public stadium such as a racetrack, a stadium such as a baseball field, or a soccer field. Applicable to.

DESCRIPTION OF SYMBOLS 1 Video display apparatus 2 Display module 3 Display panel 4 Light emitting display element 5 Display element driver 6 Non-volatile memory 7 Control unit 12 Camera 13 Control center 34 Computer 35 Panel moving apparatus 36 Camera moving apparatus 37 Panel stand Csig Setting information

Claims (2)

A video display device having a display surface on which a plurality of light emitting display elements are arranged and displaying video based on information from a control center,
Storage means for storing luminous intensity correction data for correcting luminous intensity for each of the luminous display elements, and an arithmetic control unit for generating luminous display element driving data for setting the luminous display element to a predetermined luminous intensity based on the luminous intensity correction data And driving means for driving the light emitting display element based on the light emitting display element drive data,
The luminous intensity correction data includes correction data in a plurality of viewing directions,
The arithmetic control unit changes the correction data in the plurality of viewing directions at a predetermined cycle based on the viewing direction setting information from the control center, and uses the correction data in each viewing direction to emit the light emitting display element. A display device for generating light emitting display element driving data for setting a predetermined luminous intensity . The display surface has a plurality of display modules arranged in a matrix, the display module has a plurality of display panels arranged in a matrix, and the display panel has a plurality of the light emitting elements arranged in a matrix. Having a display element;
Each of the display panels includes the storage unit, each of the display modules includes the arithmetic control unit, and the arithmetic control unit corrects all the light emitting display elements in the display panel in the same viewing direction. The video display device according to claim 1, wherein the light emitting display element driving data is generated using data.

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