JP6080456B2 - Video display device - Google Patents

Description

  The present invention relates to a video display panel in which a plurality of light emitting display elements typified by LEDs and the like are regularly arranged in a matrix as pixels as one unit, and a plurality of video display panels are connected to constitute a screen. The present invention relates to a video display device that eliminates variation in luminous intensity for each pixel of a light emitting display element and can display a display surface with uniform brightness over the entire area.

  When a video display device in which light-emitting display elements are arranged as pixels is driven to display under the same driving conditions in all pixels, it is rough over the entire screen due to variations in the luminous intensity of each pixel arbitrarily. There is a problem that a uniform display cannot be obtained on the display video screen on the video display device, such as viewing. For this reason, on the control side for driving the light emitting display elements, it is necessary to correct the luminance of the pixels in order to absorb variations in the luminous intensity of each light emitting display element.

  Conventionally, a video display device called an image display device configured as shown in FIG. 8 has been proposed as a response to such a demand (see Patent Document 1). FIG. 8 is a configuration diagram of the image display device disclosed in Patent Document 1 (however, the reference numerals are changed), and the first non-volatile for each video display device unit called an element driving unit 110 is shown. The first non-volatile memory 113, which is a memory, is mounted, and in this, in order to absorb the variation in the luminous intensity of the individual light emitting display elements constituting the video display panel and to drive the light emission uniformly, for all pixels, The brightness correction value data of the same number corrected by adjusting the brightness in advance for each pixel is stored, and the brightness correction is controlled by referring to the brightness correction value data at the time of control. It is intended to keep the screen uniform without being affected by.

  Further, the first non-volatile memory in the element driving unit 110 is caused by communication failure due to noise from the connection cable (noise picked up by the cable), disconnection, or the like, which occurs because the control unit 120 and the element driving unit 110 are physically separated from each other. The brightness correction value data on 113 may not be read by the microcomputer 121 (abbreviated as “microcomputer” in this figure, also referred to as “microcomputer” hereinafter) 121 in the control unit 120. In this case as well, there arises a problem that a variation in the light emitting display elements cannot be corrected and a non-uniform screen is displayed.

  For this reason, when data abnormality or communication abnormality occurs in the nonvolatile memory in the drive element unit by preparing the second nonvolatile memory 123 as the second nonvolatile memory for the backup of the brightness correction value data. However, by using the brightness correction value data from the backup data, individual variations of the light emitting display elements can be absorbed, and a stable and uniform display screen can be obtained without being affected by noise or the like. That is, apart from the first non-volatile memory 113 for storing the luminance correction value, a means including a second non-volatile memory 123 for backup storage is provided, and the luminance correction is transferred and stored in the second non-volatile memory 123. In the control unit, the value data is used when the brightness correction value data of the first nonvolatile memory 113 cannot be normally used due to an abnormality in communication with the first nonvolatile memory 113 or the like. Provided.

Japanese Patent No. 4738903 (page 12, FIG. 1)

  In the conventional video display device or the image display device disclosed in Patent Document 1, brightness correction value data is stored in a nonvolatile memory mounted in the video display panel in order to absorb individual variations of the light emitting display elements. However, in the case of data destruction of the non-volatile memory in the video display panel or image display panel, the optimal brightness correction value cannot be used, and a problem may occur that a non-uniform screen is displayed. It was necessary to replace the video display panel.

  In addition, luminance correction on the non-volatile memory in the video display panel provided in the element drive unit due to poor communication due to noise from the cable, disconnection, etc., which occurs because the control unit and the element drive unit are physically separated. The value data may not be read by the microcomputer in the control unit. In this case as well, there is a problem that the variation of the light emitting display elements cannot be corrected and the image display screen becomes uneven.

  Further, since it is necessary to provide a non-volatile memory for storing brightness correction value data for each video display panel, the cost of the non-volatile memory itself and the cost of providing communication means in the video display panel are added, resulting in an increase in cost. There was a problem.

  The present invention has been made to solve the above-described problems, and integrates the video of the video display panel without mounting a nonvolatile memory for storing brightness correction value data in the video display panel. A non-volatile memory for storing brightness correction value data for a plurality of display panels is mounted on the control unit to be controlled, and the non-volatile memory on the control unit is not directly from the display panel, but directly from an external personal computer, etc. By storing the brightness correction value data from the device, the above-mentioned problems such as data abnormality of the nonvolatile memory in the drive element unit, communication abnormality, and cost are solved, and individual variations of the light emitting display elements are reduced. The purpose is to obtain a uniform display screen across the entire display area of the video display device, without being affected by external noise, etc. To have.

The video display device according to the present invention is:
A plurality of video display panels having a display element group composed of a plurality of light emitting display elements and a display element driver for driving a signal to the display element group, used for a video screen;
A video memory for temporarily storing video signal data displayed on the video screen;
A luminance correction value memory for temporarily storing luminance correction value data for correcting variations in luminance for each of the light emitting display elements constituting the display element group;
An arithmetic controller for calculating the video signal data stored in the video memory and the luminance correction value data stored in the luminance correction value memory to generate driver driving data for driving the video display panel;
A non-volatile memory for storing the brightness correction value data collectively for the plurality of video display panels;
A microcomputer that is a control device for transmitting and receiving the brightness correction value data to and from the video display panel;
Have a, generally controls the image of the image display panel control unit,
A video display device comprising:
The nonvolatile memory is not mounted in the plurality of video display panels, is mounted on the control unit, and is the brightness correction value data directly input from the outside of the video display device. , Storing the brightness correction value data for each pixel mounted in the control unit by exchanging data with the microcomputer,
The microcomputer controls the video display device as a whole, and rewrites the content of the brightness correction value memory or the nonvolatile memory by an external communication signal to control the video displayed on the video display panel. Done
Using the signal transmitted from the outside of the video display device, the luminance correction value data generated so that the luminance of each light emitting display element becomes constant is written in the nonvolatile memory, and the luminance correction value data is taken into account. The video display control is performed under the above driving conditions.

According to the present invention, the video display panel is not equipped with a non-volatile memory for storing the brightness correction value data, and a plurality of video display panels are provided on the control unit that performs overall control of the video displayed on the video display panel. By installing and storing a non-volatile memory that stores brightness correction value data for the non-volatile memory in the display unit, data abnormalities, communication abnormalities, and cost problems are eliminated, and individual variations in light emitting display elements are absorbed. There is a remarkable effect that a uniform display screen can be obtained stably over the entire pixels of the video display device without being affected by noise or the like.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the whole structure of the video display apparatus concerning Embodiment 1 of this invention. It is a figure for demonstrating the write-in structure of the brightness | luminance correction value data about the video display panel which comprises the video display module of the video display apparatus concerning Embodiment 1 of this invention. It is explanatory drawing of the video display module which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the method of writing the brightness | luminance correction value data which concern on Embodiment 1 of this invention on a video display panel. It is explanatory drawing which shows the structure of the video display apparatus concerning Embodiment 2 of this invention. It is explanatory drawing which shows a response | compatibility with the video display module and writing tool format in the case of writing the luminance correction value data based on Embodiment 2 of this invention. It is a schematic diagram which shows an example of the method of the brightness | luminance correction at the time of the maintenance which concerns on Embodiment 3 of this invention. It is a figure which shows the structure of the conventional video display apparatus.

EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated using a figure below.
Embodiment 1 FIG.
FIG. 1 is an explanatory diagram showing the overall configuration of a video display device 100 according to the present invention. In FIG. 1, a control unit 1 is a component that performs video control of the video display device 100 of the present invention, and a video display panel 2 is a video shown as a set of a display element driver 8 and a display element group 9 in the figure. A plurality of display panels are assembled. In the display element group 9, individual light emitting display elements are mounted on the video display panel shown as the set, and display video on the video display device 100 of the present invention.
Here, both components of the control unit 1 and the video display panel 2 are configured as separate substrates, and both components are connected by a signal cable (not shown).
Further, a single control unit 1 can drive a plurality of video display panels 2a, 2b, 2c,. In the control unit 1, the arithmetic controller 3 calculates the video signal data read from the video memory 4 and the luminance correction value data read from the luminance correction value memory 5, and drives the signals of the display element group of the video display panel 2. The driver drive data for the display element driver to be generated is generated. To explain the above in a specific example, for example, when the video signal data is 10-bit data having gradation representation of 1024 steps, and the luminance correction value data is, for example, 256 steps of 8-bit, the two are multiplied. Thus, video data having a gradation expression of a maximum of 18 bits is obtained. Actually, since there is no 18-bit display capability on the video display panel side, arithmetic control processing is performed to delete the lower 8 bits and make 10-bit representation.

The video memory 4 is composed of a RAM, and video signal data having a data amount corresponding to the total number of pixels included in the video display device 100 is received from an upper control unit disposed outside the video display device 100. The high-order video signal input via 3 is temporarily stored via the arithmetic controller 3. The brightness correction value memory 5 is composed of a RAM, and temporarily stores brightness correction value data via the arithmetic controller 3. Here, the upper control unit is a control unit having a dedicated video display controller (not shown) for performing video display of the video display device 100 positioned at the lower level. The upper video signal is video signal data output from the upper video display controller, for example, data having 10-bit gradation representation of 1024 levels. For example, at a timing other than the reading process with respect to the video memory, for example, The refresh writing update is performed at a 60 Hz cycle, and the moving image display that can be seen on a television or the like is possible.

  Further, the microcomputer 6 controls the video device and controls the communication signal. The nonvolatile memory 7 exchanges data with the microcomputer, and stores brightness correction value data for each pixel mounted on the control unit 1.

  On the other hand, the video display panel 2 is composed of a display element driver 8 and each component of a display element group 9 composed of light emitting display elements such as LEDs, and driver drive data as an output of the arithmetic controller 3 is input to the display element driver 8. The

    FIG. 2 is a diagram for explaining the writing configuration of the brightness correction value data of the video display panel 2 constituting the video display module of the video display device 100 according to Embodiment 1 of the present invention. In FIG. 2, a video display panel 2, a light emitting display element 21 such as an LED that is mounted on the video display panel 2 and emits light to display a video, a control unit 1 for driving and displaying the video display panel 2, and a control unit 1. A personal computer 22 for writing brightness correction value data to the camera, a camera 23 for measuring the brightness of each pixel of the light emitting display element 21 such as an LED on the video display panel 2, a control of the camera 23, and This is a personal computer 25 different from the above for generating brightness correction value data from the brightness measurement data using the brightness correction value file 24.

  FIG. 3 is an explanatory diagram of the video display module 30 in the video display device 100 according to the present invention and is a diagram for explaining physical connections. 3, the video display module 30 includes a video display panel 1, a video display panel 2, and a plurality of video display panels in which the luminance correction value of the light emitting display element 21 as a component is controlled by the control unit 1. ..., the image display panel 16 is regularly arranged and mounted.

  Next, the operation of the video display apparatus 100 according to Embodiment 1 will be described in detail with reference to the drawings. As shown in FIG. 1, the video display device 100 includes one control unit 1 and a plurality of video display panels 2. The video display panel 2 drives the light emitting display element 21 to display video, and the control unit 1 controls a plurality of video display panels 2. Actually, the video display panel 2 and the control unit 1 are configured on separate substrates, and are connected by a signal cable (not shown).

  Specifically, the video display panel 2 drives a display element group 9 composed of light-emitting display elements having a plurality of (for example, 16 dots × 16 dots) LEDs as pixels, and the display element group 9. And a display element driver 8 for this purpose.

  Further, the control unit 1 includes a microcomputer 6 as a control device, a luminance correction value memory 5, a nonvolatile memory 7, a video memory 4, and an arithmetic controller 3. The microcomputer 6 performs overall control of the entire video display device 100 and control for transmitting / receiving luminance correction value data to / from the video display panel 2. The brightness correction value memory 5 includes a RAM and temporarily stores brightness correction value data. The nonvolatile memory 7 is for storing brightness correction value data. Here, the contents of the overall control of the microcomputer will be supplementarily described below. The microcomputer controls the video displayed on the video display panel freely by rewriting the contents of the video memory and brightness correction value memory and the contents of the non-volatile memory via the arithmetic controller by the communication signal from the outside. I can do it. As a result, instead of displaying the video from the upper video signal, the video display specified by the microcomputer, for example, the display of the cross pattern, white display, red display, blue display, green display, etc. is displayed on the display panel. It becomes possible to perform a lighting check test.

  The brightness correction value memory 5 and the nonvolatile memory 7 store brightness correction value data having a data amount corresponding to the total number of pixels included in the video display device 100. Note that the brightness correction value data stored in the brightness correction value memory 5 is the same data read out from the nonvolatile memory 7 and developed.

  The video memory 4 is composed of a RAM, and video signal data having a data amount corresponding to the total number of pixels included in the video display device 100 is a higher control unit arranged outside the video display device 100, that is, a video located at a lower level. An upper video signal from a control unit having a dedicated video display controller (not shown) for displaying video on the display device 100 is input via the arithmetic controller 3, and this video signal data is temporarily stored. .

  The arithmetic controller 3 calculates video signal data stored in the video memory 4 and luminance correction value data stored in the luminance correction value memory 5 to drive the video display panel 2 (all pixels). Generate driver drive data (the same number as the number). At this time, the arithmetic and control unit 3 reads only the data for driving the desired display element group 9 from the entire video signal data and the entire luminance correction value data, respectively, and reads them at a synchronized timing. Then, by calculating each read data, driver drive data for driving a desired display element group 9 is generated and transmitted to one of the corresponding video display panels 2. This read operation and calculation operation are finally performed on all the display element groups 9 by sequentially advancing the memory address by the display element driver 8. As a result, all the light emitting display elements included in all the video display panels 2 are driven.

  As described above, the luminance correction value data for a plurality of video display panels is not provided in the control unit for controlling the video of the video display panel without mounting the nonvolatile memory for storing the luminance correction value data in the video display panel. By installing and storing a non-volatile memory that stores data, data abnormalities, communication errors, and cost problems in the non-volatile memory in the display unit can be eliminated, and individual variations in light-emitting display elements can be absorbed, and the entire image display panel can be absorbed. The object is to obtain a stable and uniform display screen that is not affected by disturbances such as noise.

  Next, a method for writing the luminance correction value data into the nonvolatile memory 7 on the control unit 1 will be described. FIG. 2 is a schematic diagram showing an example of a device configuration for writing brightness correction value data into the video display device according to the present invention. On the video display panel 2, a plurality of light emitting display elements 21 typified by LEDs and the like are regularly arranged in a matrix as pixels. In recent years, LEDs have become light emitting display elements 21 as representative pixels of video display panels. Since each of the light emitting display elements 21 has variations in luminous intensity characteristics (luminance), the luminance is measured by the camera 23 under a constant driving condition, and each of the light emitting display elements 21 is measured by the personal computer 25 based on the luminance measurement data. Luminance correction value data is generated so that the luminance of the light emitting display element 21 is constant and stored in the luminance correction file 24. When the light-emitting display element 21 is driven, video display control is performed under driving conditions that take this luminance correction value data into consideration, and the display quality of a large video screen is maintained, such as reducing variations in luminance and eliminating display unevenness.

Here, the brightness correction value data generated in a plurality of display panels is managed by the brightness correction value file 24 in a format format organized for each arbitrary video display panel quantity.
For example, the luminance correction value data of the video display panels 1 to 100 is stored in the luminance correction value file A, and the luminance correction value data of the video display panels 101 to 200 is stored in the luminance correction value file B. In the brightness correction value file C, brightness correction value data of the video display panels 201 to 300 is stored.

  In addition, at a site where a large video screen is installed, a brightness correction file generated in advance is copied to a write-only personal computer 22 and written to the nonvolatile memory 7 on the control unit 1. Writing is performed by sending a communication signal via the communication line on the control unit to the nonvolatile memory 7 via the microcomputer 6.

  FIG. 3 is a physical connection diagram of the control unit 1 and a plurality of video display panels 2a, 2b, 2c,. For each video display module unit in which video display panels are regularly arranged and mounted as shown in FIG. 3, one control unit 1 is arranged to drive a plurality of video display panels on the video display module 30. Here, an image display panel (a total of 16 panels) having four columns and four columns is shown as an example. That is, the brightness correction value data of the video display panels 1 to 16 is stored in the control unit 1 in the video display module 30.

FIG. 4 shows an example of a format by a writing tool for writing luminance correction value data of an arbitrary video display panel 2 to the control unit 1 in the video display module 30. In this figure, in the order of video display panels 1-16,

A_001, A_002, A_010, A_011,
A_050, B_001, B_002, B_003,
B_011, B_012, C_010, C_012,
C_013, A_055, C_050, B_004,

And the numbers in the luminance correction value file are specified together with the designations A, B, C,..., X in the luminance correction value file 24 shown in the lower right of FIG.

Embodiment 2. FIG.
FIG. 5 is an explanatory diagram showing the configuration of the video display apparatus 101 according to the second embodiment of the present invention.
In the first embodiment, the case where the video display module 30 is used has been described. However, as shown in FIG. 5, a large video screen combines a plurality of video display modules to form a large video display device. The embodiment will be described with reference to FIG. 5, in which a means for writing luminance correction value data for all display panels to all control units at once after a large local video screen is constructed will be described. .

  FIG. 5 shows an example in which the video display module 30 is configured in two vertical rows and three horizontal rows. A control unit 1 is mounted in each video display module, and the control unit 1 drives a plurality of video display panels 2 in the corresponding video display module. The control unit 1 in each video display panel 2 is connected from a personal computer through a communication line such as the RS485 standard, and can be connected to each other by a write-only personal computer 22. A brightness correction file generated in advance is copied to the write-only personal computer 22 and the specified brightness correction value data is transmitted to the control unit 1 in the video display module 30 according to the writing tool format.

FIG. 6 shows an example of the writing tool format. The formats shown in the example of FIG. 4 are listed in order. For example, in the video display module 1, a video module that is written and designated in the format shown in FIG. The same applies to writing in other writing tool formats (B, C,..., X).
As described above, waiting for the large video screens to be assembled locally, and writing the brightness correction value data of all the video display panels in batches, the work efficiency can be improved.

Embodiment 3 FIG.
In the first and second embodiments, the brightness correction value data is set to optimize the video display quality of the large video screen, but the brightness correction value of the video display panel is arbitrarily changed for the purpose of maintenance and the like. The case where it does is demonstrated below.
For the purpose of maintenance, etc., the luminance correction value data of any video display panel that has been changed is fed back to the master luminance correction value file that is the master of the luminance correction value data for each of the multiple video display panels. Means for correcting the contents to make the latest data will be described below (see FIG. 7). The maintenance feedback unit prevents an event that is not reflected when the next brightness correction value data is written.

  FIG. 7 is a schematic diagram showing an example of the brightness correction method during maintenance according to the third embodiment of the present invention. The brightness correction value file, the brightness correction value writing tool, the video display module and the pixel image, and the brightness The correction value changing tool and the brightness correction value reading tool for maintenance and their relationship are shown. Here, it is assumed that the video display module is configured by a video display panel having four columns and four columns, and the video display panel is configured by pixels of eight columns and eight columns.

  In normal operation, specify brightness correction value data to be paired with multiple video display panels placed in the video display module in the format shown in the writing tool, read from the brightness correction value file with the writing tool, and display the video. A file is written to the control unit of the module (this figure shows an example in which the file B 102 is executed). This flow is indicated by solid arrows in the figure.

On the other hand, in the maintenance feedback flow, the luminance correction value data corresponding to the pixels in the video display panel is changed by the luminance correction value change tool. Thereafter, maintenance reading is performed from the control unit in the video display module with the reading tool, and maintenance reading is finally performed on the luminance correction value file (FIG. 7 shows an example in which maintenance reading is performed on the file B 102). This flow is indicated by a dashed arrow.
In the above description of the third embodiment, the case where the brightness correction value is changed for the purpose of maintenance has been described. However, the present invention is not limited to this purpose, and is also applicable to the case where the brightness correction value is changed for other purposes such as a specification change. It is possible and has the same effect. It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 control unit, 2, 2a, 2b, 2c video display panel, 3 arithmetic controller, 4 video memory, 5 brightness correction value memory, 6 microcomputer, 7 non-volatile memory, 8 display element driver, 9 display element group, 21 light emission Display element, 22, 25 Personal computer, 23 Camera, 24 Brightness correction value file, 30 Video display module, 100 Video display device.

Claims (4)

A plurality of video display panels having a display element group composed of a plurality of light emitting display elements and a display element driver for driving a signal to the display element group, used for a video screen;
A video memory for temporarily storing video signal data displayed on the video screen;
A luminance correction value memory for temporarily storing luminance correction value data for correcting variations in luminance for each of the light emitting display elements constituting the display element group;
An arithmetic controller for calculating the video signal data stored in the video memory and the luminance correction value data stored in the luminance correction value memory to generate driver driving data for driving the video display panel;
A non-volatile memory for storing the brightness correction value data collectively for the plurality of video display panels;
A microcomputer that is a control device for transmitting and receiving the brightness correction value data to and from the video display panel;
Have a, generally controls the image of the image display panel control unit,
A video display device comprising:
The nonvolatile memory is not mounted in the plurality of video display panels, is mounted on the control unit, and is the brightness correction value data directly input from the outside of the video display device. , Storing the brightness correction value data for each pixel mounted in the control unit by exchanging data with the microcomputer,
The microcomputer controls the video display device as a whole, and rewrites the content of the brightness correction value memory or the nonvolatile memory by an external communication signal to control the video displayed on the video display panel. Done
Using the signal transmitted from the outside of the video display device, the luminance correction value data generated so that the luminance of each light emitting display element becomes constant is written in the nonvolatile memory, and the luminance correction value data is taken into account. A video display device that performs video display control under the driving conditions. It further has a writing tool for extracting and formatting arbitrary data from the luminance correction value file filed with the luminance correction value data of the video display panel, and assigning the luminance correction value data of each video display panel by the writing tool. The video display module according to claim 1, wherein a video display module regularly mounted is created, the control unit is arranged for each video display module, and a plurality of video display modules are driven by the control unit. apparatus. 3. The latest brightness correction value file is generated by feeding back the changed information to the brightness correction value file when the brightness correction value data of the video display panel is changed. Video display device. 4. The luminance correction value data of the entire video display panel is collectively written to the plurality of control units after the video screen having a plurality of the control units is installed. The video display device described in 1.