KR102597751B1 - Multivision system and method of driving the same - Google Patents

Abstract

The present invention relates to a multivision system capable of alleviating luminance reduction without impairing the continuity of images in display modules belonging to the viewer's concentration area and a method of driving the same. Each of a plurality of display modules according to an embodiment includes a host The corresponding APL is calculated from the segmented image supplied by the system, the spread APL is determined by spreading the corresponding APL to surrounding display modules within the diffusion range set through the host system, and the image data of the segmented image is distributed based on the determined spreading APL. Calibrate and display the corrected image data on the corresponding display panel.

Description

Multivision system and its driving method {MULTIVISION SYSTEM AND METHOD OF DRIVING THE SAME}

The present invention relates to a multivision system and a method of driving the same that can alleviate luminance reduction without impairing image continuity in display modules belonging to a viewer's concentration area.

Flat display devices that display images using digital image data include liquid crystal displays (LCD) using liquid crystals, OLED displays using organic light emitting diodes (OLEDs), and electrophoretic particles. A representative example is an electrophoretic display (EPD) using .

Among these, the OLED display device is a self-luminous device that emits light in an organic light-emitting layer by recombination of electrons and holes. It has high brightness, low driving voltage, and can be made ultra-thin, so it is expected to be a next-generation display device. The OLED display device can reduce power consumption by adjusting the brightness of the image according to the average picture level (APL) for the input image.

Recently, research is being conducted to apply OLED display devices to multi-vision, which displays a single image or partially different images by connecting a plurality of display modules that can be driven independently to each other.

When configuring multi-vision using multiple OLED display modules, in order to reduce power consumption, each of the multiple OLED display modules can use a method of analyzing the APL according to the input image and adjusting the brightness of the image according to the analyzed APL. there is.

However, when using a method of adjusting luminance according to the corresponding APL in each of a plurality of OLED display modules, when the APL is different for each display module, there is a luminance deviation compared to the same gray level between display modules, so the image quality is the same as the luminance discontinuity at the boundary of the display modules. Defects may occur.

To prevent this, when the APLs of all of the plurality of OLED display modules are unified, the luminance of the plurality of OLED display modules is reduced overall, as the APL is unified based on the largest APL.

The present invention provides a multivision system and a method of driving the same that can alleviate luminance reduction without impairing the continuity of images in display modules belonging to a viewer's concentration area.

The multivision system according to an embodiment of the present invention displays split images distributed and supplied from a host system on corresponding display panels using light-emitting elements, and includes a plurality of display modules connected to each other. Each of the plurality of display modules calculates the corresponding APL from the segmented image supplied from the host system, spreads the corresponding APL to surrounding display modules within the diffusion range set through the host system, determines the spread APL, and matches the determined spread APL. Based on this, the image data of the segmented image is corrected, and the corrected image data is displayed on the corresponding display panel.

Each of the plurality of display modules compares the total current calculation value calculated on a frame-by-frame basis using the current value for the corrected image data and the preset image data with the preset total current reference value, and reduces the corresponding display panel to the total current reference value or less. Calculate the corresponding automatic current limit (hereinafter ACL) value to limit the total current, determine one of the ACL values of each of the plurality of display modules as a common ACL value through communication between the plurality of display modules, and determine the common ACL value. Based on this, the corrected image data is secondarily corrected, and the secondly corrected image data is displayed on the corresponding display panel.

The multivision system according to an embodiment of the present invention can alleviate the luminance difference between display modules belonging to the viewer's concentration area by spreading the APL of the display modules in diffusion range units considering the observer's concentration area, so that the image viewed by the observer The decrease in luminance can be alleviated compared to the case of unifying the overall APL to the maximum value without impairing the continuity of .

In addition, the multivision system according to an embodiment of the present invention can alleviate the luminance difference between a plurality of display modules due to current limitation by unifying the ACL value for current limitation to the minimum value through mutual communication between a plurality of display modules. there is.

1 is a block diagram schematically showing a multivision system according to an embodiment of the present invention.
Figure 2 is a block diagram schematically showing the configuration of each display module in a multivision system according to an embodiment of the present invention.
Figure 3 is a block diagram showing the configuration of a timing controller in each display module according to an embodiment of the present invention.
Figure 4 is a flowchart showing a method of driving each display module in a multivision system according to an embodiment of the present invention.
Figure 5 is a diagram illustrating the APL diffusion range according to an embodiment of the present invention.

1 is a block diagram schematically showing a multivision system according to an embodiment of the present invention.

The multivision system shown in FIG. 1 includes a host system 10 and a plurality of display modules D11 to Dnm (n and m are natural numbers of 3 or more) respectively connected to the host system 10.

The host system 10 receives an image source and distributes and supplies the image source to a plurality of display modules (D11 to Dnm). The host system 10 scales the images to be displayed on the plurality of display modules D11 to Dnm according to the resolution of each display module, and then supplies the scaled images to each display module along with basic timing control signals. The host system 10 may supply each image to each display module (D11 to Dnm) along with unique ID (Identification) information assigned to each of the plurality of display modules (D11 to Dnm).

Each of the plurality of display modules D11 to Dnm processes segmented images individually transmitted from the host system 10 and displays them on each display panel. A plurality of display modules (D11 to Dnm) may be arranged in a matrix form as shown in FIG. 1 or may be arranged in various forms to form a single screen. Of course, since the plurality of display modules (D11 to Dnm) independently receive the corresponding images from the host system 10, they can be grouped into a plurality of groups as needed to configure different screens for each group or individual screens. A plurality of display modules (D11 to Dnm) can transmit and receive necessary information between display modules through mutual communication.

In order to reduce power consumption, each of the plurality of display modules (D11 to Dnm) uses an image processing method to adjust the brightness of the image by primarily correcting the image data based on the APL calculated by analyzing the input image at least in frame units. Use it.

In particular, in order to alleviate the luminance difference between display modules due to luminance adjustment according to the APL in each of the plurality of display modules (D11 to Dnm), each of the plurality of display modules (D11 to Dnm) is preset by the host system 10. APL is spread and applied in units of spread range. In other words, each of the plurality of display modules (D11 to Dnm) determines the diffusion APL by averaging the APL of the surrounding display modules and the diffusion range within the diffusion range, and sends the image data to 1 based on the determined diffusion APL. Correct it gradually.

The diffusion range of the APL is set through the host system 10, and when an observer looks at the multi-vision, the designer or user uses the host system 10 to determine the range that the observer can focus on based on where the observer is looking. It can be set through.

The observer's field of view is over 160 degrees, but the focusing range is about 5 degrees, and it is known that the luminance of areas outside this focusing range is difficult for the observer to perceive. The user or designer can set the concentration area of the observer, where the observer can perceive the luminance of the image displayed on the multivision, as the diffusion range through the host system 10, taking into account the cognitive characteristics of the observer.

For example, if the multivision system is 77 inches, one display module is about 1700*1000 in size, and assuming the observer's position is about 3000, the observer's field of view is concentrated within 3000*5100, so each display By spreading the module's APL to eight adjacent display modules, the concentration area viewed by the viewer can alleviate luminance deviation.

Accordingly, the plurality of display modules D11 to Dnm apply the APL of the display modules by spreading them in units of the diffusion range set through the host system 10, thereby reducing the luminance difference between the display modules belonging to the concentration area viewed by the observer. You can. Therefore, luminance reduction can be alleviated compared to the case where the APL of all of the plurality of display modules (D11 to Dnm) is unified to the maximum value without impairing the continuity of images between modules.

In addition, each of the plurality of display modules D11 to Dnm calculates the total current in a frame unit for displaying an image of one frame using the first corrected image data based on the diffuse APL. Each of the plurality of display modules (D11 to Dnm) calculates an ACL (Automatic Current Limit) value to automatically limit the current so that the calculated total current in each frame does not exceed the predetermined total current standard value of the display panel. do. A plurality of display modules (D11 to Dnm) determine the minimum value among the plurality of ACL values as the common ACL value through inter-module communication. Each of the plurality of display modules (D11 to Dnm) secondarily adjusts the brightness of the image by secondarily correcting the image data based on the common ACL value, thereby further reducing power consumption and using the common ACL value. By doing so, luminance deviation due to differences in ACL values between display modules can be prevented. Each of the plurality of display modules (D11 to Dnm) displays secondary corrected image data on each display panel.

Figure 2 is a block diagram schematically showing the configuration of each display module in a multivision system according to an embodiment of the present invention.

Each display module shown in FIG. 2 includes a timing controller 100, a data driver 200 and a gate driver 300, a display panel 400, a power supply, and a gamma voltage generator.

The display panel 400 displays an image through a pixel array in which pixels are arranged in a matrix form. The basic pixel is at least three subpixels (W/R/G, B/W/ R, G/B/W, R/G/B, or W/R/G/B).

Each subpixel (SP) independently drives the OLED element, for example, connected between the supply line (PL1) of the high-potential power supply (EVDD) and the supply electrode (PL2) of the low-potential power supply (EVSS). To do this, a pixel circuit including first and second switching TFTs (ST1, ST2), a driving TFT (DT), and a storage capacitor (Cst) is provided. Since the pixel circuit configuration is diverse, it is not limited to the structure of FIG. 2.

The OLED element has an anode connected to the driving TFT (DT), a cathode connected to a supply line (PL2) of low potential voltage (EVSS), and a light emitting layer between the anode and the cathode, and is supplied through the driving TFT (DT). Generates light proportional to the amount of current applied.

The first switching TFT (ST1) is driven by the gate signal of one gate line (GLa) to supply the data voltage from the corresponding data line (DL) to the gate node of the driving TFT (DT), and the second switching TFT (ST2) ) is driven by the gate signal of another gate line (GLb) to supply the reference voltage from the reference line (RL) to the source node of the driving TFT (DT). The second switching TFT (ST2) can be further used as a path for outputting current from the driving TFT (DT) to the reference line (RL) in sensing mode.

A storage capacitor (Cst) connected between the gate node and the source node of the driving TFT (DT) is connected to the data voltage supplied to the gate node through the first switching TFT (ST1) and the source node through the second switching TFT (ST2). The differential voltage of the reference voltage supplied is charged and supplied as the driving voltage of the driving TFT (DT).

The driving TFT (DT) controls the current supplied from the supply line (PL1) of the high-potential power supply (EVDD) according to the driving voltage supplied from the storage capacitor (Cst), thereby supplying a current proportional to the driving voltage to the OLED element. Makes the device emit light.

The data driver 200 receives data control signals and image data from the timing controller 100. The data driver 200 is driven according to a data control signal, divides the reference gamma voltage set supplied from the gamma voltage generator into gray scale voltages, and then converts the digital image data into analog data signals using the segmented gray scale voltages. Converts and supplies analog data signals to each data line of the display panel 400.

The data driver 200 is composed of a plurality of data drive ICs that separately drive the data lines of the display panel 400, and each data drive IC has a TCP (Tape Carrier Package), COF (Chip On Film), and FPC (Flexible Print). It may be mounted on a circuit film such as a circuit film and attached to the display panel 400 using a TAB (Tape Automatic Bonding) method, or it may be mounted on the display panel 400 using a COG (Chip On Glass) method.

The gate driver 300 drives each of the plurality of gate lines of the display panel 400 using a gate control signal supplied from the timing controller 100. The gate driver 300 supplies a scan pulse of the gate-on voltage to each gate line in the corresponding scan period in response to the gate control signal, and supplies a gate-off voltage in the remaining periods.

The gate driver 300 is composed of at least one gate IC and is mounted on a circuit film such as TCP, COF, FPC, etc. and attached to the display panel 400 in a TAB method, or may be mounted on the display panel 400 in a COG method. You can. In contrast, the gate driver 300 is a GIP (Gate In Panel) type built in the non-display area of the display panel 400 by being formed on a thin film transistor substrate together with the thin film transistor array that constitutes the pixel array of the display panel 400. It can be provided with

The timing controller 100 receives image data and basic timing control signals from the host system 10. The timing controller 100 controls the driving timing of the data driver 200 and the gate driver 300 using input basic timing control signals. The input timing signal includes a dot clock, a data enable signal, a vertical synchronization signal, and a horizontal synchronization signal. However, the vertical synchronization signal and the horizontal synchronization signal may be omitted here, in which case the timing controller 100 generates data according to the dot clock. By counting the enable signal, a vertical synchronization signal and a horizontal synchronization signal can be generated and used. Data control signals that control the operation of the data driver 200 may include a source start pulse, a source sampling clock, and a source output enable signal. Gate control signals that control the driving of the gate driver 300 may include a gate start pulse, gate shift clock, gate output enable signal, etc.

Additionally, the timing controller 100 transmits the APL and ACL values of the corresponding module through communication with other display modules through a built-in transmitter and receiver, and receives and uses the APL and ACL values of the other module.

The timing controller 100 calculates the APL for the input image at least on a frame basis, transmits the calculated APL to peripheral display modules within the diffusion range set by the host system 10, and also transmits the APL to peripheral display modules within the diffusion range. The spread APL is determined by averaging the APLs received from the display modules and its own APL. The timing controller 100 adjusts the target luminance to be inversely proportional to the diffuse APL by primarily correcting the image data using the determined diffuse APL.

The timing controller 100 calculates the total current in each frame using the first corrected image data and calculates the ACL value for current limitation through comparison and calculation with a predetermined total current reference value. The timing controller 100 transmits the calculated ACL value to other display modules, receives the ACL value from each of the other display modules, and determines the minimum value among the plurality of received ACL values as the common ACL value. The timing controller 100 secondarily adjusts and reduces the target luminance by secondarily correcting the firstly corrected image data based on a common ACL value. The timing controller 100 supplies secondary corrected image data to the data driver 200.

Additionally, the timing controller 100 may further perform necessary image processing such as RGB-to-WRGB conversion, data rendering, image quality compensation, and degradation compensation prior to the image processing process for reducing power consumption described above. Additionally, the timing controller 100 may perform inverse gamma correction before image processing to linearize image data, and may perform gamma correction after image processing to non-linearize image data and output it to the data driver 200. This image processing block may be implemented in hardware within the timing controller 100 or may refer to an image processing module of software stored in memory.

FIG. 3 is a block diagram showing the configuration of a timing controller in each display module according to an embodiment of the present invention, and FIG. 4 is a flowchart showing a method of driving each display module in a multivision system according to an embodiment of the present invention. , Figure 5 is a diagram illustrating the APL diffusion range according to an embodiment of the present invention.

Referring to FIG. 3, the timing controller 100 includes an input unit 102, an APL calculation unit 104, an APL spreading unit 106, a first gain determination unit 110, a first data correction unit 112, and an ACL. It includes a calculation unit 114, an ACL determination unit 116, a second gain determination unit 118, a second data correction unit 120, an output unit 122, and a module communication unit 108. The “~ part” constituting the timing controller 100 is a block that processes at least one function or operation, and may refer to hardware or a corresponding function processing module of software stored in memory. Hereinafter, the description will be made in conjunction with FIGS. 3 and 4.

The APL calculation unit 104 uses the image data supplied through the input unit 102 to calculate the corresponding APL for the input image at least on a frame basis using a known method (S42). The APL calculation unit 104 supplies the calculated corresponding APL to the APL spreading unit 106.

The APL spreading unit 106 receives the corresponding APL supplied from the APL calculating unit 104 and spreads the corresponding APL through the module communication unit 108 to surrounding display modules that fall within the spreading range set through the host system 10. In addition to the transmitting box, APLs received through the module communication unit 108 are supplied from each of the surrounding display modules within the spread range. The APL spreading unit 106 determines the spread APL by averaging the corresponding APL and the APLs of surrounding display modules supplied through the module communication unit 108 (S44). The APL diffusion unit 106 supplies the determined diffusion APL to the first gain determination unit 110.

For example, as shown in FIG. 5, when the display modules belonging to the diffusion range (observer concentration area) set by the host system 10 are set to 9, the corresponding display module D22 located in the center displays the corresponding APL. It is spread to eight adjacent display modules (D11, D12, D13, D21, D23, D31, D32, D33). As a result, the APL determination unit 106 of the display module D22 located in the center determines the APL22 and the eight surrounding display modules D11, D12, D13, D21, D23, D31, and D32 within the diffusion range. , APL12, APL13, APL21, APL23, APL31, APL32, and APL33 received from (D33) are all added up, divided by the total number of display modules (9) belonging to the spread range, averaged, and the spreading coefficient preset by the designer. Further multiply by (α) to determine the diffusion APL. The diffusion range and diffusion coefficient (α) of the APL can be adjusted in various ways by the designer depending on the characteristics of the multivision and the installation location considering the distance from the observer.

The first gain determination unit 110 uses the spread APL supplied from the APL spreading unit 106 to determine a first frame gain that is inversely proportional to the spread APL (S46). The first gain determination unit 100 uses an APL curve of a preset APL function or a look-up table (hereinafter referred to as LUT) in which the first frame gain for APL is preset to determine the first frame corresponding to the spread APL. Determine the gain. To control power consumption, the first frame gain is determined to have an inverse relationship with the spread APL. That is, as the diffusion APL is larger (brighter the image), a relatively small first frame gain is determined, and as the APL is smaller (darker the image), a relatively large first frame gain is determined. The first gain determination unit 110 supplies the determined first frame gain to the first data correction unit 112.

The first data correction unit 112 primarily corrects the image data using the first frame gain supplied from the first gain determination unit 110 (S48). The first data correction unit 112 may adjust the target luminance to be inversely proportional to the diffuse APL by primarily correcting the image data by multiplying the image data by the first frame gain. By primary correction of the image data using the first frame gain, the larger the diffusion APL (the smaller the first frame gain is), the lower the grayscale value of the image data, and the smaller the APL (the smaller the first frame gain is), the lower the grayscale value of the image data is. (larger than 1) the grayscale value of the image data increases. The first data correction unit 112 supplies first corrected image data to the ACL calculation unit 114.

The ACL calculation unit 114 calculates the total current in units of frames using the first corrected image data supplied from the first data correction unit 112 (S50), and calculates the total current calculation value and the predetermined total current. The ACL value for current limitation is calculated through comparison and calculation with the current reference value (S52). The ACL calculation unit 114 calculates the total current in each frame by adding up all the current values corresponding to each image data using the current values for each gray level (for each luminance) pre-stored in LUT form for each color channel corresponding to the image data. You can. Since the efficiency of OLED devices is different for each color, the LUT that stores the current value for each gray level (by brightness) can be set differently for each color channel. The ACL calculation unit 114 compares the total current calculation value with a predetermined total current reference value and calculates an ACL value for limiting the total current below the total current reference value. For example, the ACL calculation unit 114 may calculate the ratio of the total current calculation value to the reference value of the total current as the corresponding ACL value. The ACL calculation unit 114 supplies the calculated corresponding ACL value to the ACL determination unit 116.

The ACL determination unit 116 receives the corresponding ACL value supplied from the ACL calculation unit 114, transmits the corresponding ACL value to a plurality of display modules through the module communication unit 108, and receives the corresponding ACL value from each of the plurality of display modules. The ACL value received through the module communication unit 108 is supplied. The ACL determination unit 116 determines the corresponding ACL value and the minimum value among the ACL values received from each of the plurality of display modules as the common ACL value (S54). The ACL determination unit 116 supplies the determined common APL value to the second gain determination unit 118.

The second gain determination unit 118 uses the common ACL value supplied from the ACL determination unit 116 to determine a second frame gain that is proportional to the common ACL value (S56). The second gain determination unit 118 may determine the second frame gain corresponding to the common ACL value using a preset LUT. The second gain determination unit 118 supplies the determined second frame gain to the second data correction unit 120.

The second data correction unit 120 secondarily corrects the image data supplied from the ACL calculation unit 114 using the second frame gain supplied from the second gain determination unit 118 (S58). The second data correction unit 120 may secondarily correct the image data by multiplying the image data by a second frame gain less than 1 to reduce the grayscale value of the image data, thereby reducing the target luminance. The second data correction unit 120 outputs the secondary corrected image data to the output unit 122.

In this way, the multivision system according to an embodiment of the present invention can alleviate the luminance difference between display modules belonging to the viewer's concentration area by spreading the APL of the display modules in units of diffusion range considering the observer's concentration area, so that the observer can The decrease in luminance can be alleviated compared to the case where the overall APL is unified to the maximum value without impeding the continuity of the viewed image.

In addition, the multivision system according to an embodiment of the present invention can alleviate the luminance difference between a plurality of display modules due to current limitation by unifying the ACL value for current limitation to the minimum value through mutual communication between a plurality of display modules. there is.

Through the above-described content, those skilled in the art will be able to see that various changes and modifications can be made without departing from the technical idea of the present invention. Therefore, the technical scope of the present invention should not be limited to what is described in the detailed description of the specification, but should be defined by the scope of the patent claims.

10: Host system 100: Timing controller
200: data driver 300: gate driver
400: display panel 102: input unit
104: APL calculation unit 106: APL spreading unit
108: module communication unit 110: first gain determination unit
112: first data correction unit 114: ACL calculation unit
116: ACL decision unit 118: second gain decision unit
120: second data correction unit 122: output unit

Claims (7)

The divided images distributed and supplied from the host system are displayed on respective display panels using light-emitting elements, and are provided with a plurality of display modules connected to each other,
Each of the plurality of display modules is
Calculate the average picture level (hereinafter APL) from the segmented image supplied from the host system, spread the APL to surrounding display modules within the diffusion range set through the host system, determine the diffusion APL, and determine the diffusion APL. A timing controller that corrects image data of the segmented image based on APL, displays the corrected image data on the corresponding display panel, and controls a panel driver that drives the corresponding display panel in each of the plurality of display modules.
A module communication unit for communicating with other display modules,
an APL calculation unit that calculates the corresponding APL from the segmented image;
an APL diffusion unit that supplies the corresponding APL to surrounding display modules within the diffusion range through the module communication unit;
an APL determination unit that determines a spread APL by averaging the APLs of the surrounding display modules received through the module communication unit and the corresponding APL;
A multivision system comprising a first data correction unit that primarily corrects image data of the segmented image based on the diffuse APL supplied from the APL determination unit. In claim 1,
Each of the plurality of display modules is
By comparing the total current calculation value calculated on a frame-by-frame basis using the current values for the corrected image data and the preset image data, and the preset total current reference value, the total current of the display panel is lowered below the total current reference value. Calculate the corresponding automatic current limit (ACL) value for limiting,
Determine one of the ACL values of each of the plurality of display modules as a common ACL value through communication between the plurality of display modules, perform secondary correction on the corrected image data based on the determined common ACL value, and perform secondary correction Display the video data on the corresponding display panel,
The timing controller is,
The total current calculation value is calculated using the first corrected image data supplied from the first data correction unit and the current value, and the corresponding ACL is calculated by comparing the calculated total current calculation value with the total current reference value. An ACL calculation unit that calculates a value,
An ACL determination unit that supplies the corresponding ACL value to the other display modules through the module communication unit and determines the minimum value among the ACL values and the ACL values of the other display modules received through the module communication unit as the common ACL value;
A multivision system further comprising a second data correction unit that secondarily corrects the primary corrected image data supplied from the ACL calculation unit based on the common ACL value supplied from the ACL determination unit. delete In claim 2,
The timing controller is
a first gain determination unit that determines a first frame gain corresponding to the spread APL supplied from the APL spreading unit and supplies the determined first frame gain to the first data correction unit;
Further comprising a second gain determination unit that determines a second frame gain corresponding to the common ACL value supplied from the ACL determination unit and supplies the determined second frame gain to the second data correction unit,
The first data correction unit primarily corrects image data of the segmented image using the first frame gain supplied from the first gain determination unit,
The second data correction unit secondly corrects the first correction image data using the second frame gain supplied from the second gain determination unit. A method of driving a multi-vision system comprising a plurality of display modules connected to each other and displaying split images distributed and supplied from a host system on respective display panels using light-emitting elements, comprising:
Each of the plurality of display modules is
calculating the corresponding APL from the segmented image supplied from the host system;
supplying the corresponding APL to surrounding display modules belonging to a spreading range set through the host system, and determining a spreading APL by averaging the surrounding APLs and the corresponding APL received from the surrounding display modules;
correcting image data of the segmented image based on the determined diffuse APL;
A method of operating a multivision system including displaying the corrected image data on a corresponding display panel. In claim 5,
calculating a total current calculation value on a frame-by-frame basis using current values for the corrected image data and preset image data;
Comparing the calculated total current value with a preset total current reference value to calculate a corresponding ACL value for limiting the total current of the display panel below the total current reference value;
determining a minimum value among the ACL values of the plurality of display modules as a common ACL value through communication with another display module;
Further comprising the step of secondary correction and output of the corrected image data based on the determined common ACL value,
The step of displaying the corrected image data on a resolution display panel is a method of driving a multivision system in which the secondary corrected image data is displayed on the corresponding display panel. In claim 6,
The step of correcting the image data of the segmented image is,
Determining a first frame gain corresponding to the diffuse APL, and correcting image data of the segmented image using the determined first frame gain,
The step of secondary correction and output of the corrected image data is,
A method of driving a multivision system for determining a second frame gain corresponding to the common ACL value and performing secondary correction on the corrected image data using the determined second frame gain.