WO2022108131A1 - Dispositif électronique et procédé de commande associé - Google Patents

Dispositif électronique et procédé de commande associé Download PDF

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Publication number
WO2022108131A1
WO2022108131A1 PCT/KR2021/014670 KR2021014670W WO2022108131A1 WO 2022108131 A1 WO2022108131 A1 WO 2022108131A1 KR 2021014670 W KR2021014670 W KR 2021014670W WO 2022108131 A1 WO2022108131 A1 WO 2022108131A1
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WIPO (PCT)
Prior art keywords
backlight
diffusion
value
virtual blocks
processor
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PCT/KR2021/014670
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English (en)
Korean (ko)
Inventor
조영훈
배태준
이희중
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삼성전자주식회사
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Publication of WO2022108131A1 publication Critical patent/WO2022108131A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present invention relates to an electronic device and a method for controlling the same, and more particularly, to an electronic device for driving a backlight unit using a local dimming technique and a method for controlling the same.
  • An electronic device that does not emit light by itself such as a liquid crystal display device, includes a backlight unit.
  • a light source such as a white light emitting diode (LED) included in the backlight unit
  • the brightness of the light may be controlled by the liquid crystal for each pixel.
  • dark images a lot of light is blocked by the liquid crystal, allowing only a small amount of light to pass through to create dark luminance, and bright images to create bright luminance by allowing most of the light to pass through.
  • Brightness is controlled by how much light is blocked by liquid crystal.
  • the liquid crystal cannot block all light, and in particular, blocking light with the liquid crystal in a dark image such as a black image is limited.
  • a light leakage phenomenon which is a limitation of the liquid crystal display, causes a decrease in the contrast ratio.
  • Local dimming is a technique for dividing a backlight unit into a plurality of physical backlight blocks and driving each physical backlight block individually.
  • the local dimming technique drives the backlight unit by decreasing the amount of light of the backlight block matching the dark part of the image and increasing the amount of light of the backlight block matching the bright part of the image.
  • the movement of the object cannot be displayed naturally when the local dimming technique is used.
  • an object of the present invention is to provide an electronic device for locally dimming a backlight so as to naturally display the motion of an object, and a method for controlling the same.
  • an electronic device for achieving the above object, including a backlight unit including a display panel, a first backlight block, and a plurality of backlight blocks including a second backlight block adjacent to the first backlight block, and the plurality of backlights. and a processor for controlling driving of the backlight unit based on current information for driving each of the blocks, wherein the processor is configured to generate a first image region and a second backlight block corresponding to the first backlight block in an input image.
  • a corresponding second image region is identified as a plurality of first virtual blocks and a plurality of second virtual blocks, respectively, and a diffusion filter is applied to at least some of the values corresponding to the plurality of first virtual blocks to apply a diffusion filter to the plurality of second virtual blocks.
  • Identifies a diffusion value that is diffused into at least a portion of the virtual blocks calculates a value corresponding to at least a portion of the plurality of second virtual blocks based on the identified diffusion value, and calculates a value corresponding to at least a portion of the plurality of second virtual blocks based on the calculated value
  • Current information corresponding to the block may be acquired.
  • the processor is configured to apply a diffusion filter to at least some of the values corresponding to the plurality of first virtual blocks to spread a first diffusion value and a plurality of second virtual blocks to the remaining portions of the plurality of first virtual blocks. identify a second diffusion value that is diffused to at least a part of Thus, the dimming duty of the current corresponding to the second backlight block may be obtained.
  • the processor may predict a motion direction of an object included in the first image region in the input image, and apply a weight obtained based on the predicted motion direction to the diffusion filter.
  • the processor is configured to weight the diffusion filter so that at least one of a diffusion range or a diffusion amount corresponding to the predicted motion direction is greater than at least one of a diffusion range or a diffusion amount corresponding to a direction opposite to the predicted motion direction. can be decided
  • the processor may determine the weight of the spreading filter so that values corresponding to the plurality of first virtual blocks are not spread in a direction opposite to the predicted motion direction.
  • the processor may predict a motion speed of the object, and determine a weight of the diffusion filter based on the motion direction and the motion speed.
  • the processor may increase or decrease a weight change amount of a diffusion filter corresponding to each frame based on the motion speed of the object.
  • the processor is configured to calculate values corresponding to the plurality of first virtual blocks based on a plurality of first pixel values corresponding to the plurality of first virtual blocks, and to calculate values corresponding to the plurality of second virtual blocks. Values corresponding to the plurality of second virtual blocks may be calculated based on the plurality of second pixel values.
  • the processor may be configured to: based on an original value corresponding to each of the plurality of second virtual blocks calculated based on the input image and a diffusion value spread to at least a part of the plurality of second virtual blocks, the plurality of second virtual blocks A value corresponding to each of the two virtual blocks may be recalculated, and the current information may be obtained based on a value corresponding to the second backlight block calculated based on the recalculated value.
  • the plurality of backlight blocks are driven according to a local dimming method in which current is individually controlled, and the display panel may be a liquid crystal panel.
  • a method of controlling an electronic device including a backlight unit including a plurality of backlight blocks including a first backlight block and a second backlight block adjacent to the first backlight block.
  • the method may include calculating a value corresponding to a portion, and obtaining current information corresponding to the second backlight block based on the calculated value.
  • the step of identifying the diffusion value includes applying a diffusion filter to at least some of the values corresponding to the plurality of first virtual blocks to spread a first diffusion value and the plurality of first virtual blocks to the remaining portions of the plurality of first virtual blocks. Identifying a second diffusion value that is diffused to at least a part of a second virtual block of A duty may be obtained, and a dimming duty of a current corresponding to the second backlight block may be obtained based on the identified second diffusion value.
  • the method may further include predicting a motion direction of an object included in the first image region from the input image, and applying a weight obtained based on the predicted motion direction to the diffusion filter.
  • At least one of a diffusion range or a diffusion amount corresponding to the predicted motion direction is higher than at least one of a diffusion range or a diffusion amount corresponding to a direction opposite to the predicted motion direction.
  • the weight of the spreading filter may be determined to be large.
  • the determining of the weight of the diffusion filter may include determining the weight of the diffusion filter so that values corresponding to the plurality of first virtual blocks are not spread in a direction opposite to the predicted motion direction.
  • the method may further include estimating a motion speed of the object, and determining the weight of the diffusion filter may include determining the weight of the diffusion filter based on the motion direction and the motion speed.
  • the determining of the weight of the diffusion filter may increase or decrease the change amount of the weight of the diffusion filter corresponding to each frame based on the motion speed of the object.
  • the method may further include calculating values corresponding to the plurality of second virtual blocks based on second pixel values.
  • the step of identifying the diffusion value may include an original value corresponding to each of the plurality of second virtual blocks calculated based on the input image and a diffusion value spread to at least a portion of the plurality of second virtual blocks. , recalculating a value corresponding to each of the plurality of second virtual blocks, and calculating a value corresponding to the second backlight block based on the recalculated value.
  • the plurality of backlight blocks are driven according to a local dimming method in which current is individually controlled, and the display panel may be a liquid crystal panel.
  • the backlight value is calculated by spreading the backlight value based on more virtual blocks than the number of physical backlight blocks, the movement of the object can be displayed naturally.
  • FIG. 1 is a view for explaining characteristics of a display panel according to an embodiment of the present disclosure.
  • FIG. 2 is a block diagram illustrating a configuration of an electronic device according to an embodiment of the present disclosure.
  • 3A and 3B are diagrams for explaining a local dimming method according to an embodiment of the present disclosure.
  • 4A and 4B are diagrams for explaining a method of obtaining a dimming duty corresponding to each backlight block according to an embodiment of the present disclosure.
  • 5A to 5C are diagrams for explaining a method of obtaining a backlight value for a virtual block according to an exemplary embodiment.
  • 6A and 6B are diagrams for explaining a method of applying a diffusion filter according to an embodiment.
  • FIG. 7 is a diagram for describing a method of calculating a physical backlight value based on a diffused backlight value, according to an exemplary embodiment.
  • 8A to 8D are diagrams for explaining a method of calculating a physical backlight value in a plurality of frames according to an exemplary embodiment.
  • 9A to 9D are diagrams for explaining a method of calculating a physical backlight value in a plurality of frames according to another exemplary embodiment.
  • 10A to 10D are diagrams for explaining a method of calculating a physical backlight value in a plurality of frames according to another exemplary embodiment.
  • 11A and 11B are diagrams for explaining a detailed configuration of an electronic device according to an embodiment of the present disclosure.
  • FIG. 12 is a flowchart illustrating a method of controlling an electronic device according to an embodiment of the present disclosure.
  • expressions such as “have,” “may have,” “include,” or “may include” indicate the presence of a corresponding characteristic (eg, a numerical value, function, operation, or component such as a part). and does not exclude the presence of additional features.
  • a component eg, a first component
  • another component eg, a second component
  • an element may be directly connected to another element or may be connected through another element (eg, a third element).
  • a “module” or “unit” performs at least one function or operation, and may be implemented as hardware or software, or a combination of hardware and software.
  • a plurality of “modules” or a plurality of “units” are integrated into at least one module and implemented with at least one processor (not shown) except for “modules” or “units” that need to be implemented with specific hardware.
  • FIG. 1 is a view for explaining a backlight control method according to local dimming to help the understanding of the present disclosure.
  • the local dimming method divides an input image by the number of backlight blocks and calculates a value for driving each backlight block through input data of each image region matching the backlight.
  • the backlight lighting time may be individually controlled for each image area.
  • the backlight value for each block calculated based on the input image Since the pixel value of the object in the image shown on the left is high, the backlight value of the region matching the object is calculated to be large, and the backlight value of the other regions is small. can be calculated. However, when the backlight value is calculated in this way, the backlight value is rapidly changed according to the position of the object. For example, in the image shown on the left side of FIG. 1 , an object is panned at a constant speed, but a matching backlight value shown on the right side of FIG. 1 does not change at a constant speed.
  • the backlight value is maintained at the same value from frame N to frame N+2 frame, and then the backlight value rapidly changes as the object crosses the boundary between the backlight block and the adjacent backlight block. Accordingly, the movement of the object may be perceived by the user unnaturally due to the difference in the backlight value change between the N frame to N+2 frame period and the N+2 to N+3 frame period.
  • FIG. 2 is a block diagram illustrating a configuration of an electronic device according to an embodiment of the present disclosure.
  • the electronic device 100 includes a display panel 110 , a backlight unit 120 , and a processor 130 .
  • the electronic device 100 may be implemented as a smart TV, Internet TV, web TV, Internet Protocol Television (IPTV), signage, PC, smart TV, monitor, smart phone, tablet, etc., but is not limited thereto.
  • LFD large format display
  • Digital Signage digital signage
  • DID Digital Information Display
  • video wall video wall
  • it can be implemented as various types of devices having a display function, such as a projector display.
  • the display panel 110 includes a plurality of pixels, and each pixel may include a plurality of sub-pixels.
  • each pixel may include three sub-pixels corresponding to a plurality of lights, for example, red, green, and blue lights (R, G, and B).
  • red, green, and blue lights R, G, and B
  • the present invention is not limited thereto, and in some cases, cyan, magenta, yellow, black, or other sub-pixels may be included in addition to the red, green, and blue sub-pixels.
  • the display panel 110 may be implemented as a liquid crystal panel. However, if local dimming according to an embodiment of the present disclosure is applicable, it may be implemented as another type of display panel.
  • the backlight unit 120 irradiates light to the display panel 110 .
  • the backlight unit 120 irradiates light to the display panel 110 from the rear surface of the display panel 110 , that is, the surface opposite to the surface on which an image is displayed.
  • the backlight unit 120 includes a plurality of light sources, and the plurality of light sources may include a linear light source such as a lamp or a point light source such as a light emitting diode, but is not limited thereto.
  • the backlight unit 120 may be implemented as a direct type backlight unit or an edge type backlight unit.
  • the light source of the backlight unit 120 is any one or two or more types of light emitting diode (LED), hot cathode fluorescent lamp (HCFL), cold cathode fluorescent lamp (CCFL), external electrode fluorescent lamp (EEFL), ELP, and FFL. may include
  • the backlight unit 120 may be implemented with a plurality of LED modules and/or a plurality of LED cabinets.
  • the LED module may include a plurality of LED pixels.
  • the LED pixel may be implemented as a Blue LED or a Whithe LED, but is not limited thereto. At least one of a RED LED, a GREEN LED, or a BLUE LED It can be implemented in a form including.
  • the processor 130 controls the overall operation of the electronic device 100 .
  • the processor 130 may be implemented as a digital signal processor (DSP), a microprocessor (microprocessor), or a time controller (TCON).
  • DSP digital signal processor
  • microprocessor microprocessor
  • TCON time controller
  • the central processing unit central processing unit (CPU), micro controller unit (MCU), micro processing unit (MPU), controller, application processor (AP), graphics-processing unit (GPU) or communication processor (CP)
  • CPU central processing unit
  • MCU micro controller unit
  • MPU micro processing unit
  • AP application processor
  • GPU graphics-processing unit
  • CP communication processor
  • the processor 130 is a SoC (System on Chip) or LSI (large scale integration) with a built-in processing algorithm. It may be implemented in the form of a field programmable gate array (FPGA), and the processor 130 may perform various functions by executing pre-stored computer executable instructions.
  • FPGA field programmable gate array
  • the processor 130 drives the backlight unit 120 to provide light to the display panel 110 .
  • the processor 130 may obtain current information for driving each of the plurality of backlight blocks and drive the backlight unit 120 based on the obtained current information. For example, the processor 130 adjusts and outputs current information for driving each of the plurality of backlight blocks, for example, at least one of a supply time and an intensity of a driving current (or a driving voltage).
  • the processor 130 may control the luminance of the light sources included in the backlight unit 120 by using pulse width modulation (PWM) in which a duty ratio is variable.
  • PWM pulse width modulation
  • the pulse width modulation signal PWM controls the ratio of turning on and off of the light sources, and the duty ratio % is determined according to a dimming value input from the processor 130 .
  • the processor 110 may control the luminance of the light sources of the backlight unit 120 by varying the intensity of the current in some cases.
  • the processor 130 may be implemented in a form including a driver IC for driving the backlight unit 120 .
  • the processor 130 may be implemented as a DSP, and may be implemented as a digital driver IC and one chip.
  • the driver IC may be implemented as hardware separate from the processor 130 .
  • the LED driver may be disposed at a rear end of a power supply (eg, a switching mode power supply (SMPS)) to receive voltage from the power supply.
  • SMPS switching mode power supply
  • a voltage may be applied from a separate power supply device.
  • the processor 130 obtains a dimming ratio for driving the backlight unit 120 , that is, a lighting duty of a current (hereinafter referred to as a dimming duty). For example, the processor 130 obtains a backlight value (or a light quantity value) based on pixel information (or pixel physical quantity) of the input image, and determines a dimming duty for driving the backlight unit 120 based on the backlight value.
  • the pixel information may be at least one of an average pixel value, a maximum pixel value (or a peak pixel value), a minimum pixel value, an intermediate pixel value, and an average picture level (APL) of the input image.
  • the pixel information may be at least one of an average pixel value, a maximum pixel value (or a peak pixel value), a minimum pixel value, an intermediate pixel value, and an APL of each image block region included in the input image.
  • the pixel value may include at least one of a luminance value (or a grayscale value) and a color coordinate value.
  • APL is used as pixel information.
  • the backlight value may be defined as various types of values in which pixel information is reflected. For example, a value obtained by multiplying a pixel value by a specific constant or a value expressing a pixel value as a ratio may be defined as various types of values capable of representing a relative amount of light.
  • the processor 130 may obtain a dimming ratio for driving the backlight unit 120 for each section, ie, a dimming duty, based on preset pixel information for each section of the input image, for example, APL information.
  • the preset section may be a frame unit, but is not limited thereto, and may be a plurality of frame sections, scene sections, and the like.
  • the processor 130 may acquire the dimming duty based on pixel information based on a preset function (or arithmetic algorithm), but the dimming duty information according to the pixel information is stored in advance in the form of, for example, a lookup table or a graph. it may have been
  • the processor 130 may convert the pixel data RGB for each frame into a luminance level according to a preset conversion function, and calculate the APL for each frame by dividing the sum of the luminance levels by the total number of pixels.
  • the present invention is not limited thereto, and it goes without saying that various conventional APL calculation methods may be used.
  • the processor 130 controls the dimming duty of an image frame having an APL of a preset value (eg, 80%) to 100%, and sets the dimming duty of an image frame having an ALP value of 80% or less to the APL value.
  • a dimming duty corresponding to each APL value may be determined using a linearly or non-linearly decreasing function that is inversely proportional to each other.
  • the dimming duty corresponding to the APL value is stored in the lookup table, the dimming duty may be read from the lookup table using the APL as the read address.
  • the processor 130 may drive the backlight unit 120 through local dimming in which the screen is identified as a plurality of regions and the backlight luminance is individually controlled for each region.
  • the processor 130 identifies the screen as a plurality of screen areas that can be separately controlled according to the implementation form of the backlight unit 120 , and includes pixel information of an image to be displayed (hereinafter referred to as an image area) of each screen area, e.g.
  • an image area pixel information of an image to be displayed
  • a dimming duty for respectively driving the light sources of the backlight unit 120 corresponding to each image area may be obtained based on the APL information.
  • each backlight region corresponding to a plurality of image regions will be referred to as a backlight block.
  • each of the backlight blocks may include at least one light source, for example, a plurality of light sources.
  • the backlight unit 120 may be implemented as a direct backlight unit 120-1 as shown in FIG. 3A .
  • the direct backlight unit 120 - 1 may be implemented in a structure in which a plurality of optical sheets and a diffusion plate are stacked under the display panel 110 , and a plurality of light sources are disposed under the diffusion plate.
  • the direct backlight unit 120 - 1 may be divided into a plurality of backlight blocks as shown in FIG. 3A based on an arrangement structure of a plurality of light sources.
  • each of the plurality of backlight blocks may be driven according to a dimming duty based on image information of a corresponding screen area as illustrated.
  • the backlight unit 120 may be implemented as an edge-type backlight unit 120 - 2 as shown in FIG. 3B .
  • the edge-type backlight unit 120 - 2 may be implemented in a structure in which a plurality of optical sheets and a light guide plate are stacked under the display panel 110 , and a plurality of light sources are disposed on a side surface of the light guide plate.
  • the edge type backlight unit 120 - 2 may be divided into a plurality of backlight blocks as shown in FIG. 3B based on an arrangement structure of a plurality of light sources.
  • each of the plurality of backlight blocks may be driven according to a dimming duty based on image information of a corresponding screen area as illustrated.
  • 4A and 4B are diagrams for explaining a method of obtaining a dimming duty corresponding to each backlight block according to an embodiment of the present disclosure.
  • the backlight unit 120 is implemented in an edge type.
  • the processor 130 obtains pixel information, for example, APL information, of each image region to be displayed on a screen region corresponding to each backlight block of the backlight unit 120, and based on the acquired pixel information, each The dimming duty of the backlight block may be calculated.
  • pixel information for example, APL information
  • the processor 130 calculates APL information of the image regions 111-1 to 111-n corresponding to each of the backlight blocks 121-1 to 121-n, respectively, as shown in the right side of FIG. 4A . can do.
  • the left side of FIG. 4B shows APL values 411-1 to 411-n of each image region 111-1 to 111-n of each image region 111-1 to 111-n according to an example. shows the case where .
  • the processor 130 determines the dimming duties 421-1 to 421-n of each backlight block 121-1 to 121-n based on the APL value of each image region obtained in FIG. 4A . n) can be calculated.
  • the processor 130 may supply the dimming duty corresponding to each backlight block to the local dimming driver by arranging the dimming duty corresponding to each backlight block according to the connection order of each backlight block.
  • the local dimming driver generates a pulse width modulation (PWM) signal having each dimming duty provided from the processor 130 , and sequentially drives each backlight block based on the generated PWM signal.
  • the processor 130 may generate a pulse width modulation signal based on the calculated dimming duty and provide it to the local dimming driver.
  • the processor 130 may identify a first image region corresponding to the first backlight block and a second image region corresponding to the second backlight block from the input image.
  • the second backlight block may be a block adjacent to the first backlight block, and accordingly, the second image area may be an area adjacent to the first image area.
  • the second backlight block may be a block adjacent to the first backlight block in at least one of up, down, left, and right directions.
  • the processor 130 may identify (or divide) the first image region into a plurality of first virtual blocks, and identify the second image region as a plurality of second virtual blocks.
  • identity or division
  • the term “identification (or division)” is used for convenience, the term can be replaced with various terms that may mean that the processor 130 identifies a plurality of pixel blocks.
  • the first and second backlight blocks may refer to any block among a plurality of backlight blocks.
  • the first virtual block (or second virtual block) is a block obtained by dividing an image region corresponding to the first backlight block (or second backlight block) virtually, and may be a block including at least one pixel. That is, the smallest virtual block unit may be one pixel unit. However, the virtual block unit must be smaller than the size of the first image area.
  • the virtual block may be obtained by dividing the image area by an integer multiple or a non-integer multiple.
  • the processor 130 obtains a value corresponding to the first virtual block based on a plurality of first pixel values corresponding to the first virtual block, that is, the first pixel block in the input image, and the second virtual block That is, a value corresponding to the second virtual block may be obtained based on a plurality of second pixel values corresponding to the second pixel block.
  • the value corresponding to the virtual block (hereinafter, the backlight value) may be various types of values obtained based on pixel information (or pixel physical quantity) of the input image as described above.
  • 5A to 5C are diagrams for explaining a method of obtaining a backlight value for a virtual block according to an exemplary embodiment.
  • FIG. 5A illustrates an input image 510 according to an embodiment
  • FIG. 5B identifies an input image as image regions 511 to 522 corresponding to a backlight block, and identifies each image region as a virtual block region. state is shown.
  • a value corresponding to each virtual block may be expressed as a value between 0 and 100 as shown in FIG. 5C .
  • the processor 130 indicates a value corresponding to the minimum grayscale as 0 and a value corresponding to the maximum grayscale as 100, and applies a certain ratio to the remaining grayscale values to display the backlight value for each virtual brightness in FIG. 5C . As shown, it can be expressed as 0 to 100.
  • the backlight value of the four virtual blocks 516-1 to 516-4 included in the specific backlight block 516 is 100 based on the input image 510 as shown in FIG. 5C. , and the backlight values of the remaining virtual blocks are assumed to be 0.
  • the processor 130 may identify a diffusion value spread to at least a portion of the plurality of second virtual blocks by applying a diffusion filter to at least some of the values corresponding to the plurality of first virtual blocks.
  • the diffusion filter may be implemented as a diffusion filter having various sizes and various filter values. For example, as long as the backlight value can be sufficiently diffused with the surrounding backlight block, it is not limited and can be applied.
  • 6A and 6B are diagrams for explaining a method of applying a diffusion filter according to an embodiment.
  • a Gaussian filter may be used as a diffusion filter.
  • the Gaussian filter as shown in FIG. 6A , 0 on the x-axis may have a large weight, and the weight may decrease toward the +/- part.
  • the center of the mask 60 has a large value and the filter value decreases toward the edge of the mask 60 .
  • the size and filter value of the filter shown in FIG. 6A are merely examples for convenience of description.
  • the size of the filter may be variously implemented according to the diffusion size, and the filter value may be variously implemented by changing the sigma value of the Gaussian function according to the diffusion amount.
  • the processor 130 applies the Gaussian mask 60 to the region 610 including the backlight value corresponding to the virtual block to perform filtering, thereby spreading the backlight value. .
  • the processor 130 applies a diffusion filter to at least some of the values corresponding to the plurality of first virtual blocks to spread the first diffusion value to the remaining portions of the plurality of first virtual blocks. and a second diffusion value that is spread to at least a part of the plurality of second virtual blocks. Subsequently, the processor 130 obtains current information corresponding to the first backlight block based on the identified first diffusion value, and obtains current information corresponding to the second backlight block based on the identified second diffusion value.
  • values corresponding to the plurality of first virtual blocks are spread only to adjacent blocks and not spread to the plurality of first virtual blocks according to the size of the diffusion filter and the filter values (or parameters).
  • the processor 130 calculates an original value corresponding to each of the plurality of second virtual blocks based on the input image, and based on the calculated original value and a diffusion value spread to at least a portion of the plurality of second virtual blocks. , values corresponding to each of the plurality of second virtual blocks may be recalculated. Subsequently, the processor 130 calculates a value corresponding to the second backlight block (hereinafter, referred to as a physical backlight value) based on the recalculated value, and obtains current information corresponding to the second backlight block based on the calculated value. can do.
  • a value corresponding to the physical backlight block is referred to as a “physical backlight value” in order to distinguish it from the backlight value corresponding to the virtual block.
  • FIG. 7 is a diagram for describing a method of calculating a physical backlight value based on a diffused backlight value, according to an exemplary embodiment.
  • the upper diagram of FIG. 7 illustrates a state 710 in which a partial backlight value of the first image region 516 is diffused to the first to sixth image regions 511 , 512 , 515 , 516 , 519 , and 520 .
  • a backlight value of 100 corresponding to some virtual blocks ( FIGS. 5C , 516-1 to 516-4) of the first image region 516 is set to the first to sixth image regions 511, 512, 515, 516 , 519 , and 520 , it can be spread by the same range in all directions.
  • the processor 130 may calculate a physical backlight value corresponding to each backlight block based on the backlight values of the virtual blocks included in each of the image regions 511 to 522 .
  • the processor 130 determines the physical backlight value based on the average value, the maximum value, the minimum value, or a value obtained by multiplying one of the backlight values of the virtual blocks included in each of the image regions 511 to 522 by a specific constant, etc. can be calculated.
  • the lower diagram of FIG. 7 is a diagram showing the physical backlight value of each backlight block 721 to 732 calculated by the diffused backlight value.
  • a physical backlight value may be calculated in various ways, such as a value calculated based on a plurality of values among corresponding values (eg, an average value of a maximum value and a minimum value).
  • the preset constant (or weight) may be the same value for each backlight block, but a different value may be applied to each backlight block according to the position of each backlight block, the intensity of the backlight value, and the like.
  • 8A to 8D are diagrams for explaining a method of calculating a physical backlight value in a plurality of frames according to an exemplary embodiment.
  • the processor 130 identifies the N-th frame 811 as a plurality of virtual blocks, spreads backlight values of at least some of the plurality of virtual blocks, and thus a backlight value 812 corresponding to each of the virtual blocks. ), and a physical backlight value 813 corresponding to each backlight block may be calculated based on the calculated backlight value 812 . Since the method of diffusing the backlight value has been described in detail with reference to FIG. 7 , further description thereof will be omitted.
  • the processor 130 generates a backlight value corresponding to the virtual block also for the N+1, N+2, and N+3 th frames 821 , 831 , and 841 that are subsequent frames.
  • physical backlight values 823 , 833 , and 843 corresponding to each backlight block may be calculated based on the diffused backlight values 822 , 832 , and 842 .
  • a physical backlight value may be calculated based on the luminance of the object as well as the backlight block in the region where the high luminance object is located.
  • the processor 130 predicts the motion direction of an object included in the image region corresponding to the first backlight block in the input image, and obtains a weight based on the predicted motion direction. Then, the obtained weight may be applied to the filter value of the diffusion filter, and the backlight value of the virtual block may be calculated using the diffusion filter including the filter value to which the weight is applied. Alternatively, the processor 130 may calculate the backlight value of the virtual block by applying the determined weight to the backlight value of each virtual block itself. However, hereinafter, for convenience of explanation, it is assumed that a weight is applied to a filter value included in the diffusion filter.
  • the processor 130 may obtain motion information (eg, a motion vector) by comparing corresponding image blocks in a plurality of image frames, and may predict a motion direction of an object based on the obtained motion information.
  • motion information eg, a motion vector
  • the processor 130 configures the diffusion filter so that at least one of a diffusion range or a diffusion amount corresponding to the predicted motion direction is different from at least one of a diffusion range or a diffusion amount corresponding to a direction other than the predicted motion direction, for example, an opposite direction.
  • weight can be determined. For example, the processor 130 determines that at least one of a diffusion range or a diffusion amount corresponding to the predicted motion direction is greater than at least one of a diffusion range or a diffusion amount corresponding to a direction different from the predicted motion direction, for example, the opposite direction.
  • the weight of the diffusion filter can be determined.
  • the processor 130 may determine the weight of the diffusion filter so that a relatively larger amount of light is spread in the predicted motion direction and spread over a relatively larger range.
  • the term "weight" is additionally applied to the filter value of the diffusion filter.
  • the meaning of applying a weight to the filter value of the diffusion filter may have the same meaning as adjusting the filter value of the diffusion filter.
  • the processor 130 applies a weight greater than the filter value (or parameter value) of the second filter region corresponding to the opposite direction to the filter value (or parameter value) of the first filter region corresponding to the predicted motion direction. can be applied to a wider filter area, and a weighted diffusion filter can be applied to the backlight value of the virtual block. Alternatively, the processor 130 may determine the weight of the diffusion filter so that the backlight value is not diffused in a direction opposite to the predicted motion direction.
  • 9A to 9D are diagrams for explaining a method of calculating a physical backlight value in a plurality of frames according to another exemplary embodiment.
  • the processor 130 predicts the motion direction of the object, and when the motion direction is predicted in the b direction, a relatively larger weight is applied to the diffusion filter area corresponding to the b direction than the area corresponding to the other direction. By applying to the filter area, the backlight value of the virtual block can be diffused.
  • the processor 130 identifies the N-th frame 911 as a plurality of virtual blocks and spreads backlight values of at least some of the plurality of virtual blocks to correspond to each of the virtual blocks.
  • a backlight value 912 may be calculated, and a physical backlight value 913 corresponding to each backlight block may be calculated based on the calculated backlight value 912 .
  • the processor 130 may diffuse the backlight value of the virtual block by applying a relatively larger weight to the diffusion filter area corresponding to the b direction than to the area corresponding to the other direction (particularly, the opposite direction a direction). .
  • FIG. 9A the processor 130 identifies the N-th frame 911 as a plurality of virtual blocks and spreads backlight values of at least some of the plurality of virtual blocks to correspond to each of the virtual blocks.
  • a backlight value 912 may be calculated, and a physical backlight value 913 corresponding to each backlight block may be calculated based on the calculated backlight value 912 .
  • the processor 130 may diffuse the backlight value of the virtual
  • the size and diffusion range of the backlight value diffused in the a direction may be smaller than the size and diffusion range of the backlight value diffused in the b direction.
  • this is only an example, and it is also possible to differently adjust only one of a size and a diffusion range of a backlight value based on a motion direction.
  • the processor 130 generates a diffusion filter region corresponding to the b direction also for the N+1, N+2, and N+3 th frames 921 , 931 and 941 , which are subsequent frames.
  • the backlight value of the virtual block can be diffused by applying a weight to the values in the same way.
  • the processor 130 may calculate physical backlight values 923 , 933 , and 943 corresponding to each backlight block based on the diffused backlight values 922 , 932 , and 942 .
  • the spreading scheme applied to the N+1, N+2, and N+3 th frames 921 , 931 , and 941 is not necessarily the same as the spreading scheme applied to the N th frame 911 , and the critical range Of course, a similar method may be applied within.
  • 10A to 10D are diagrams for explaining a method of calculating a physical backlight value in a plurality of frames according to another exemplary embodiment.
  • the processor 130 may diffuse the backlight value only in the b direction and not spread the backlight value in the other directions.
  • the processor 130 identifies the N-th frame 1011 as a plurality of virtual blocks and diffuses backlight values of at least some of the plurality of virtual blocks only in the b direction to create a virtual
  • a backlight value 1012 corresponding to each of the blocks may be calculated, and a physical backlight value 1013 corresponding to each of the backlight blocks may be calculated based on the calculated backlight value 1012 .
  • the processor 130 illuminates the backlight of the virtual block only in the b direction with respect to the N+1, N+2, and N+3 th frames 1021, 1031, and 1041 which are subsequent frames. values can be spread. Thereafter, the processor 130 may calculate physical backlight values 1023 , 1033 , and 1043 corresponding to each backlight block based on the diffused backlight values 1022 , 1032 , and 1042 .
  • the processor 130 may predict the motion speed of the object and determine (or identify) a weight to be applied to the diffusion filter based on the motion speed of the object. For example, the processor 130 may predict the motion speed as well as the motion direction of the object, and adjust at least one of a diffusion range, a diffusion amount, or a diffusion change amount based on the motion direction and the motion speed of the object.
  • the processor 130 obtains motion information (eg, a motion vector) by comparing corresponding image blocks in a plurality of image frames, and predicts a motion direction and a motion speed of an object based on the obtained motion information.
  • the processor 130 determines the weight of the diffusion filter so that the weight of the filter area corresponding to the predicted motion direction is greater than the weight of the filter area corresponding to the direction opposite to the predicted motion direction, and Based on the motion speed, the weight change amount of the diffusion filter corresponding to each frame may be determined.
  • the processor 130 may increase or decrease the weight change amount of the diffusion filter corresponding to each frame in proportion to the predicted motion speed.
  • the processor 130 may increase or decrease the variation in the spreading range of the spreading filter corresponding to each frame in proportion to the predicted motion speed.
  • the processor 130 calculates a dimming duty for each backlight block based on the corresponding backlight value, and drives each backlight block based on the calculated dimming duty.
  • the backlight unit 120 may be controlled.
  • the processor 130 may additionally perform spatial filtering to reduce a dimming difference between each backlight block.
  • spatial filtering or duty spread adjustment
  • the processor 130 performs spatial filtering (or duty spread adjustment) on the dimming duty for each block in order to alleviate the dimming difference between each backlight block. can do.
  • the processor 130 may adjust the dimming duty of each backlight block based on the dimming duty of the neighboring blocks of each backlight block.
  • a filtering method in which a spatial filter having a window of a specific size (eg, 3 ⁇ 3 size) is applied by giving a specific weight to the dimming duty of 8 blocks adjacent to the dimming duty of the current block by giving a specific weight to the dimming duty of 8 blocks adjacent to the dimming duty of the current block By adjusting the dimming duty of the current block, the dimming difference between adjacent blocks can be alleviated.
  • a spatial filter having a window of a specific size eg, 3 ⁇ 3 size
  • 11A and 11B are diagrams for explaining a detailed configuration of an electronic device according to an embodiment of the present disclosure.
  • the electronic device 100 includes a display panel 110 , a backlight unit 120 , a processor 130 , a backlight driver 140 , a panel driver 150 , a memory 160 , and a communication interface 170 . and a user interface 180 .
  • a display panel 110 the electronic device 100 includes a display panel 110 , a backlight unit 120 , a processor 130 , a backlight driver 140 , a panel driver 150 , a memory 160 , and a communication interface 170 . and a user interface 180 .
  • a detailed description of the configuration overlapping the configuration shown in FIG. 2 among the configurations shown in FIG. 11A will be omitted.
  • the display panel 110 is formed so that the gate lines GL1 to GLn and the data lines DL1 to DLm cross each other, and the R, G, and B sub-pixels PR, PG, and PB are formed at the intersections. This is formed
  • the adjacent R, G, and B sub-pixels PR, PG, and PB constitute one pixel. That is, each pixel includes an R sub-pixel PR displaying red (R), a G sub-pixel PG displaying green (G), and a B sub-pixel PB displaying blue (B).
  • the color of the subject is reproduced with the three primary colors (R), green (G), and blue (B).
  • each of the sub-pixels PR, PG, and PB includes a pixel electrode and a common electrode, and the light transmittance is changed as the liquid crystal arrangement is changed by an electric field formed by a potential difference between the electrodes.
  • the TFTs formed at the intersections of the gate lines GL1 to GLn and the data lines DL1 to DLm respectively respond to the scan pulses from the gate lines GL1 to GLn.
  • Data that is, red (R), green (G), and blue (B) data is supplied to the pixel electrodes of each of the sub-pixels PR, PG, and PB.
  • the backlight driver 140 may be implemented in a form including a driver IC for driving the backlight unit 120 .
  • the driver IC may be implemented as hardware separate from the processor 130 .
  • the driver IC may be implemented as at least one LED driver that controls the current applied to the LED devices.
  • the LED driver may be disposed at a rear end of a power supply (eg, a switching mode power supply (SMPS)) to receive voltage from the power supply.
  • SMPS switching mode power supply
  • a voltage may be applied from a separate power supply device.
  • the panel driver 150 may be implemented in a form including a driver IC for driving the display panel 110 .
  • the driver IC may be implemented as hardware separate from the processor 130 .
  • the panel driver 150 may include a data driver 151 that supplies video data to data lines and a gate driver 152 that supplies scan pulses to the gate lines. have.
  • the data driver 151 is a means for generating a data signal, and receives R/G/B image data from the processor 130 (or a timing controller (not shown)) and generates a data signal. Also, the data driver 151 applies a data signal generated by being connected to the data lines DL1 , DL2 , DL3 , ..., DLm of the display panel 110 to the display panel 110 .
  • the gate driver 152 (or scan driver) is a means for generating a gate signal (or scan signal) and is connected to the gate lines GL1 , GL2 , GL3 , ..., GLn to transmit the gate signal to the display panel 110 . to a specific line in The data signal output from the data driver 161 is transmitted to the pixel to which the gate signal is transmitted.
  • the panel driver 150 may further include a timing controller (not shown).
  • the timing controller receives an input signal IS, a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, and a main clock signal MCLK from an external, for example, the processor 130 and receives an image data signal , a scan control signal, a data control signal, a light emission control signal, etc. may be generated and provided to the display panel 110 , the data driver 151 , the gate driver 165 , and the like.
  • the memory 160 stores various data necessary for the operation of the electronic device 100 .
  • the memory 160 stores data necessary for the processor 130 to execute various processes.
  • it may be implemented as an internal memory such as a ROM or RAM included in the processor 130 , or may be implemented as a memory separate from the processor 130 .
  • the memory 160 may be implemented in the form of a memory embedded in the electronic device 100 or may be implemented in the form of a memory detachable from the electronic device 100 according to the purpose of data storage.
  • data for driving the electronic device 100 is stored in a memory embedded in the electronic device 100
  • data for an extended function of the electronic device 100 is detachable from the electronic device 100 . It can be stored in any available memory.
  • the memory embedded in the electronic device 100 is implemented in the form of a non-volatile memory, a volatile memory, a flash memory, a hard disk drive (HDD), or a solid state drive (SSD), and is attached and detached to the electronic device 100 .
  • a memory capable of this it may be implemented in the form of a memory card (eg, micro SD card, USB memory, etc.), an external memory connectable to a USB port (eg, USB memory), and the like.
  • the memory 160 stores at least one of information related to the diffusion filter (eg, a filter value of the diffusion filter) and weight-related information (eg, a motion direction or a motion speed) according to an embodiment of the present disclosure.
  • weight corresponding to one may be stored.
  • the corresponding information may be received in real time from an external device such as a set-top box, an external server, or a user terminal.
  • the communication interface 170 is configured to communicate with various types of external devices according to various types of communication methods.
  • the communication interface 170 includes a High Definition Multimedia Interface (HDMI), AV, Composite, Mobile High-Definition Link (MHL), Universal Serial Bus (USB), Display Port (DP), and Thunderbolt. , a video graphics array (VGA) port, an RGB port, a D-subminiature (D-SUB), a digital visual interface (DVI), an optical port, and an input/output interface of at least one component.
  • HDMI High Definition Multimedia Interface
  • AV Composite
  • MHL Mobile High-Definition Link
  • USB Universal Serial Bus
  • DP Display Port
  • Thunderbolt Thunderbolt
  • VGA video graphics array
  • RGB RGB
  • D-SUB D-subminiature
  • DVI digital visual interface
  • optical port an input/output interface of at least one component.
  • the communication interface 170 includes at least one of a Wi-Fi module, a Bluetooth module, an Ethernet communication module, and an infrared communication module.
  • each communication module may be implemented in the form of at least one hardware chip.
  • the Wi-Fi module and the Bluetooth module perform communication using a WiFi method and a Bluetooth method, respectively.
  • various types of connection information such as an SSID and a session key are first transmitted and received, and then various types of information can be transmitted/received after communication connection using this.
  • the infrared communication module communicates according to the infrared data association (IrDA) technology, which wirelessly transmits data in a short distance using infrared that is between visible light and millimeter waves.
  • IrDA infrared data association
  • the wireless communication module includes Zigbee, 3rd Generation (3G), 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE), LTE Advanced (LTE-A), 4th Generation (4G), 5G It may include at least one communication chip that performs communication according to various wireless communication standards such as (5th Generation).
  • 3G 3rd Generation
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • 4G 4th Generation
  • 5G 5G It may include at least one communication chip that performs communication according to various wireless communication standards such as (5th Generation).
  • the communication interface 170 may include at least one of a local area network (LAN) module, an Ethernet module, or a wired communication module for performing communication using a pair cable, a coaxial cable, or an optical fiber cable.
  • LAN local area network
  • Ethernet Ethernet
  • wired communication module for performing communication using a pair cable, a coaxial cable, or an optical fiber cable.
  • the corresponding information may be received through the communication interface 170 .
  • the amount of calculation must be increased, so that some calculations necessary to calculate the physical backlight value may be performed by an image processing device (not shown) or an external server.
  • the user interface 180 may be implemented as a device such as a button, a touch pad, a mouse, and a keyboard, or may be implemented as a touch screen capable of performing the above-described display function and manipulation input function together.
  • the button may be various types of buttons such as a mechanical button, a touch pad, a wheel, etc. formed in an arbitrary area such as the front, side, or rear of the exterior of the main body of the electronic device 100 .
  • the user interface 180 may be implemented with a microphone, a camera, a motion sensor, etc. that enable voice recognition or motion recognition.
  • the user interface 180 may be implemented to receive a signal corresponding to a user input (eg, a touch, a press, a touch gesture, a voice, or a motion) from an external control device.
  • a user input eg, a touch, a press, a touch gesture, a voice, or a motion
  • the external control device may be implemented as a microphone, a camera, a motion sensor, or the like.
  • the external control device may be implemented as a remote control including a microphone.
  • the remote control receives the user's analog voice signal through the microphone, the remote control converts the analog voice signal into a digital voice signal, and transmits the converted digital voice signal to the electronic device 100 using at least one of infrared, Wi-Fi, and Bluetooth communication methods. ) can be transmitted.
  • the electronic device 100 may perform voice recognition based on the received digital voice signal and may perform a control operation based on voice recognition result information.
  • the external control device may be implemented as a smartphone including a microphone.
  • the smartphone may remotely control the electronic device 100 using a remote control application that performs a remote control function.
  • the smartphone may convert the analog voice signal into a digital voice signal and perform voice recognition on the digital voice signal using a voice recognition application.
  • the voice recognition application may be the same as or different from the above-described remote control application.
  • voice recognition is performed on a digital voice signal
  • the smartphone may remotely control the smartphone using a remote control application based on voice recognition result information.
  • the smart phone may transmit the converted digital voice signal to the electronic device 100 using at least one of infrared rays, Wi-Fi, and Bluetooth communication methods.
  • the electronic device 100 may perform voice recognition based on the received digital voice signal and perform a control operation based on voice recognition result information.
  • the electronic device 100 may communicate with the server for various operations including voice recognition, and a communication interface for communicating with the server may be different from a communication interface for communicating with a remote controller (eg, Ethernet Modem, Wi-Fi module vs BT module), may be the same (Wi-fi module).
  • a remote controller eg, Ethernet Modem, Wi-Fi module vs BT module
  • the electronic device 100 when the electronic device 100 is implemented as a TV, it may further include a tuner (not shown), and the tuner (not shown) amplifies, mixes, Through resonance, etc., only the frequency of a channel to be received by the electronic device 100 may be selected by tuning among many radio wave components.
  • the electronic device 100 may additionally include various components, such as a camera, a microphone, a speaker, a motion sensor, a position sensor, a touch sensor, and a proximity sensor, according to an implementation example of the electronic device 100 .
  • FIG. 12 is a flowchart illustrating a method of controlling an electronic device according to an embodiment of the present disclosure.
  • a first backlight block among the plurality of backlight blocks is identified as a plurality of first virtual blocks, and the first backlight block is adjacent to the first backlight block.
  • the second backlight block may be identified as a plurality of second virtual blocks (S1210).
  • the plurality of backlight blocks may be driven according to a local dimming method in which current is individually controlled, and may provide light to a display panel, for example, a liquid crystal panel.
  • the diffusion filter may be applied to at least some of the values corresponding to the plurality of first virtual blocks to identify diffusion values that are spread to at least some of the plurality of second virtual blocks ( S1220 ).
  • a value corresponding to at least a portion of the plurality of second virtual blocks may be calculated based on the identified diffusion value (S1230).
  • current information corresponding to the second backlight block may be acquired based on the calculated value ( S1240 ).
  • the first backlight block may be driven based on the acquired current information ( S1250 ).
  • a diffusion filter is applied to at least some of the values corresponding to the plurality of first virtual blocks, so that at least some of the first diffusion values and the plurality of second virtual blocks are spread to the remaining portions of the plurality of first virtual blocks. It is possible to identify a diffused, diffused, second diffused value.
  • current information corresponding to the first backlight block is obtained based on the identified first diffusion value, and current information corresponding to the second backlight block is obtained based on the identified second diffusion value.
  • control method includes predicting a motion direction of an object included in an image region corresponding to the first backlight block in an input image, identifying a weight of a diffusion filter based on the predicted motion direction, and applying the determined weight
  • the method may further include applying to a diffusion filter.
  • the step of identifying the weight of the diffusion filter is such that at least one of a diffusion range or a diffusion amount corresponding to the predicted motion direction is greater than at least one of a diffusion range or a diffusion amount corresponding to a direction opposite to the predicted motion direction. It is possible to determine the weight of the diffusion filter.
  • the weight of the diffusion filter may be determined so that values corresponding to the plurality of first virtual blocks are not spread in a direction opposite to the predicted motion direction.
  • control method may further include estimating the motion speed of the object, and the identifying the weight of the diffusion filter may identify the weight of the diffusion filter based on the motion direction and the motion speed.
  • the step of identifying the weight of the diffusion filter may increase or decrease the change amount of the weight of the diffusion filter corresponding to each frame based on the motion speed of the object.
  • control method includes calculating values corresponding to the plurality of first virtual blocks based on a plurality of first pixel values corresponding to the plurality of first virtual blocks, and a plurality of values corresponding to the plurality of second virtual blocks.
  • the method may further include calculating values corresponding to the plurality of second virtual blocks based on the second pixel values of .
  • step S1220 calculating an original value corresponding to each of the plurality of second virtual blocks based on the input image, based on the calculated original value and a diffusion value spread to at least a part of the plurality of second virtual blocks.
  • the method may include recalculating a value corresponding to each of the plurality of second virtual blocks, and calculating a value corresponding to the second backlight block based on the recalculated value.
  • the backlight value is calculated by spreading the backlight value based on more virtual blocks than the number of physical backlight blocks, the movement of the object can be displayed naturally.
  • the dimming duty for local dimming is calculated by the electronic device 100 including the display panel 110, but in some cases, a separate image processing device ( (not shown) or it is also possible to calculate the dimming duty by an external server.
  • the image processing apparatus may be implemented as various apparatuses capable of image processing, such as a set-top box and a sending box that provide an image signal to a display panel.
  • the dimming duty may be calculated by an image processing apparatus (not shown) or an external server using only some operations. For example, as the number of virtual blocks increases, the amount of calculation must be increased, so that some calculations necessary to calculate the physical backlight value may be performed by an image processing device (not shown) or an external server.
  • various embodiments of the present disclosure described above may be performed through an embedded server provided in an electronic device or an external server of at least one of the electronic device and the electronic device.
  • a device is a device capable of calling a stored instruction from a storage medium and operating according to the called instruction, and may include an electronic device (eg, electronic device A) according to the disclosed embodiments.
  • the processor When executed by the processor, the processor may perform a function corresponding to the instruction, either directly or by using other components under the control of the processor,
  • the instruction may include code generated or executed by a compiler or interpreter.
  • the readable storage medium may be provided in the form of a non-transitory storage medium, where 'non-transitory' means that the storage medium does not include a signal and is tangible. It does not distinguish between semi-permanent or temporary storage of data in the storage medium.
  • the method according to the various embodiments described above may be included in a computer program product and provided.
  • Computer program products may be traded between sellers and buyers as commodities.
  • the computer program product may be distributed in the form of a machine-readable storage medium (eg, compact disc read only memory (CD-ROM)) or online through an application store (eg, Play StoreTM).
  • an application store eg, Play StoreTM
  • at least a portion of the computer program product may be temporarily stored or temporarily generated in a storage medium such as a memory of a server of a manufacturer, a server of an application store, or a relay server.
  • each of the components may be composed of a single or a plurality of entities, and some sub-components of the aforementioned sub-components may be omitted, or other sub-components may be omitted. Components may be further included in various embodiments.
  • some components eg, a module or a program
  • operations performed by a module, program, or other component may be sequentially, parallelly, repetitively or heuristically executed, or at least some operations may be executed in a different order, omitted, or other operations may be added.

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  • Liquid Crystal Display Device Control (AREA)

Abstract

La présente invention concerne un dispositif électronique. Le dispositif électronique comprend : un panneau d'affichage ; une unité de rétroéclairage composée d'une pluralité de blocs de rétroéclairage comprenant un premier bloc de rétroéclairage et un second bloc de rétroéclairage ; et un processeur servant à commander l'excitation de l'unité de rétroéclairage sur la base d'informations de courant servant à exciter chaque bloc de la pluralité de blocs de rétroéclairage. Le processeur peut identifier, sous la forme d'une pluralité de premiers blocs virtuels, une première région d'image correspondant au premier bloc de rétroéclairage dans une image d'entrée, il peut identifier, sous la forme d'une pluralité de seconds blocs virtuels, une seconde région d'image correspondant au second bloc de rétroéclairage qui est adjacent au premier bloc de rétroéclairage, il peut appliquer un filtre de diffusion à au moins certaines valeurs correspondant à la pluralité de premiers blocs virtuels pour identifier une valeur de diffusion obtenue par la diffusion vers au moins certains blocs parmi la pluralité de seconds blocs virtuels, et il peut acquérir des informations de courant correspondant au second bloc de rétroéclairage, sur la base de valeurs correspondant à au moins certains de la pluralité de seconds blocs virtuels, les valeurs étant acquises sur la base de la valeur de diffusion identifiée.
PCT/KR2021/014670 2020-11-18 2021-10-20 Dispositif électronique et procédé de commande associé WO2022108131A1 (fr)

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KR10-2020-0154319 2020-11-18
KR1020200154319A KR20220067752A (ko) 2020-11-18 2020-11-18 전자 장치 및 그 제어 방법

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WO2022108131A1 true WO2022108131A1 (fr) 2022-05-27

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100964469B1 (ko) * 2009-11-24 2010-06-16 엘지전자 주식회사 디스플레이 장치
KR20110003806A (ko) * 2009-07-06 2011-01-13 주식회사 티엘아이 글로벌 디밍 및 로컬 디밍을 겸용할 수 있는 디스플레이 장치
KR20110057506A (ko) * 2009-11-24 2011-06-01 엘지디스플레이 주식회사 액정표시장치 및 그의 로컬디밍 제어방법
KR101539359B1 (ko) * 2009-02-05 2015-07-27 삼성디스플레이 주식회사 광원 구동 방법, 이를 수행하기 위한 광원 장치 및 이 광원장치를 포함하는 표시 장치
KR20200046516A (ko) * 2018-10-24 2020-05-07 삼성전자주식회사 디스플레이 장치 및 그 구동 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101539359B1 (ko) * 2009-02-05 2015-07-27 삼성디스플레이 주식회사 광원 구동 방법, 이를 수행하기 위한 광원 장치 및 이 광원장치를 포함하는 표시 장치
KR20110003806A (ko) * 2009-07-06 2011-01-13 주식회사 티엘아이 글로벌 디밍 및 로컬 디밍을 겸용할 수 있는 디스플레이 장치
KR100964469B1 (ko) * 2009-11-24 2010-06-16 엘지전자 주식회사 디스플레이 장치
KR20110057506A (ko) * 2009-11-24 2011-06-01 엘지디스플레이 주식회사 액정표시장치 및 그의 로컬디밍 제어방법
KR20200046516A (ko) * 2018-10-24 2020-05-07 삼성전자주식회사 디스플레이 장치 및 그 구동 방법

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