WO2021177546A1 - Unité de rétroéclairage - Google Patents

Unité de rétroéclairage Download PDF

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Publication number
WO2021177546A1
WO2021177546A1 PCT/KR2020/015959 KR2020015959W WO2021177546A1 WO 2021177546 A1 WO2021177546 A1 WO 2021177546A1 KR 2020015959 W KR2020015959 W KR 2020015959W WO 2021177546 A1 WO2021177546 A1 WO 2021177546A1
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WO
WIPO (PCT)
Prior art keywords
light emitting
emitting devices
light
emitting device
device group
Prior art date
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PCT/KR2020/015959
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English (en)
Korean (ko)
Inventor
무크타로브파리드
김대식
니시다야스히로
Original Assignee
삼성전자주식회사
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Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Publication of WO2021177546A1 publication Critical patent/WO2021177546A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Definitions

  • the present disclosure relates to a backlight unit, and more particularly, to a backlight unit having a local dimming zone for performing local dimming control.
  • a display device is an output device that visually displays received or stored image information to a user, and is used in various fields such as homes and businesses.
  • the display device includes a monitor device connected to a personal computer or a server computer, a portable computer device, a navigation terminal device, a general television device, an Internet Protocol television (IPTV) device, a smart phone, Portable terminal devices such as tablet PCs, personal digital assistants (PDA), or cellular phones, various display devices used to reproduce images such as advertisements or movies in industrial fields, or other various types of audio /video system, etc.
  • a monitor device connected to a personal computer or a server computer
  • a portable computer device a navigation terminal device
  • a general television device an Internet Protocol television (IPTV) device
  • IPTV Internet Protocol television
  • smart phone Portable terminal devices
  • PDA personal digital assistants
  • various display devices used to reproduce images such as advertisements or movies in industrial fields, or other various types of audio /video system, etc.
  • the display device may display an image by applying a voltage to the liquid crystal layer to control the amount of light emitted from each pixel of the display panel.
  • the display panel for displaying an image includes a self-luminous display panel that emits light by itself according to an image, and a non-luminous display panel that blocks or passes light emitted from a separate light source according to the image.
  • a typical non-emission display panel is a liquid crystal display panel (LCD Panel).
  • the liquid crystal display panel may include a backlight unit emitting light and a liquid crystal panel blocking or passing light emitted from the backlight unit.
  • the liquid crystal display panel uses a dimming technology to control the backlight unit in order to increase the contrast ratio and reduce power consumption.
  • the dimming technology may be divided into global dimming and local dimming that controls an area locally according to the purpose of improvement.
  • the light emitting devices included in each local dimming area are also arranged in a matrix form, so there is a problem that a light leakage phenomenon (Mura) occurs between the local dimming areas.
  • Mura light leakage phenomenon
  • a backlight unit includes a backlight unit including a plurality of light emitting devices arranged in a matrix form, and includes a first light emitting device including a plurality of first light emitting devices that emit light based on a first control signal. small group; and a second light emitting device group including a plurality of second light emitting devices that emit light based on a second control signal, wherein four light emitting devices closest to each of some of the first light emitting devices among the plurality of first light emitting devices are included.
  • the device may include at least two second light emitting devices belonging to the second light emitting device group.
  • four light emitting devices closest to each of some of the second light emitting devices may include at least two first light emitting devices belonging to the first light emitting device group.
  • four light emitting devices closest to each of some of the first light emitting devices may not include the first light emitting device.
  • the four light emitting devices closest to each of some of the first light emitting devices may all be the second light emitting devices.
  • a third light emitting device group including a plurality of third light emitting devices that emit light based on a third control signal; further including, among the plurality of first light emitting devices, four of the first light emitting devices closest to each of some of the first light emitting devices
  • the number of light emitting devices may include at least one third light emitting device belonging to the third light emitting device group.
  • a fourth light emitting device group including a plurality of fourth light emitting devices that emit light based on a fourth control signal; further comprising, among the plurality of first light emitting devices, four of the first light emitting devices closest to each of some of the first light emitting devices
  • the number of light emitting devices may be two second light emitting devices belonging to the second light emitting device group, one third light emitting device belonging to the third light emitting device group, and one fourth light emitting device belonging to the fourth light emitting device group. have.
  • the number of the plurality of first light emitting devices belonging to the first light emitting device group may be the same as the number of the plurality of second light emitting devices belonging to the second light emitting device group.
  • the number of the plurality of first light emitting devices belonging to the first light emitting device group may be different from the number of the plurality of second light emitting devices belonging to the second light emitting device group.
  • first light emitting devices belonging to the first light emitting device group four first light emitting devices may be arranged in a 2x2 matrix shape.
  • each of the plurality of first light emitting devices outputs light of a first brightness corresponding to the first control signal
  • each of the plurality of second light emitting devices emits light of a second brightness corresponding to the second control signal.
  • the plurality of first light emitting devices may be connected to a first wire
  • the plurality of second light emitting devices may be connected to a second wire
  • the backlight unit may further include a support configured to support and fix the plurality of light emitting devices and made of a printed circuit board, wherein the plurality of light emitting devices are mounted on the support in a Chip On Board method. attached, and may be manufactured in a flip chip type.
  • the plurality of first light emitting devices may be connected to a first line of the printed circuit board, and the plurality of second light emitting devices may be connected to a second line of the printed circuit board.
  • the backlight unit may further include a quantum dot film for converting wavelengths of light emitted from the plurality of light emitting devices.
  • the backlight unit may include a plurality of transparent resins formed to surround the plurality of light emitting devices; and a plurality of light conversion layers configured to convert wavelengths of light emitted from the plurality of light emitting devices and surround outer peripheral surfaces of the plurality of transparent resins.
  • a backlight unit includes a backlight unit including a plurality of light emitting devices arranged in a matrix form, wherein the plurality of light emitting devices includes: a first light emitting device; and two second light emitting devices disposed in a row closest to a row in which the first light emitting device is disposed, and disposed in a column in which the first light emitting device is disposed;
  • the light emitting element and the second light emitting element may emit light based on different control signals.
  • the plurality of light emitting devices includes: two third light emitting devices disposed in a column closest to the column in which the first light emitting device is disposed, and disposed in a row in which the first light emitting device is disposed;
  • the light emitting element and the third light emitting element may emit light based on different control signals.
  • the plurality of light emitting devices four fourth light emitting devices disposed in the column closest to the column in which the first light emitting device is disposed, and disposed in the row closest to the row in which the first light emitting device is disposed; and , The first light emitting device and the fourth light emitting device may emit light based on different control signals.
  • the two second light emitting devices may emit light based on the same control signal.
  • the two second light emitting devices may emit light based on different control signals, respectively.
  • the two third light emitting devices may emit light based on the same control signal.
  • the two third light emitting devices may emit light based on different control signals, respectively.
  • the second light emitting device and the third light emitting device may emit light based on the same control signal.
  • two of the four fourth light emitting devices may emit light based on the same control signal.
  • the first light emitting device may output light of a first brightness corresponding to the first control signal
  • the second light emitting device may output light of a second brightness corresponding to the second control signal
  • FIG. 1 is a diagram illustrating an appearance of a display device including a backlight unit according to an exemplary embodiment.
  • FIG. 2 is an exploded view of a display device including a backlight unit according to an exemplary embodiment.
  • FIG 3 is an exploded view of a backlight unit according to an exemplary embodiment.
  • FIG. 4 is a diagram for explaining a local dimming area applied to a conventional local dimming technique.
  • 5 to 10 are diagrams illustrating a local dimming area of a backlight unit according to various embodiments of the present disclosure
  • FIG. 11 is a diagram illustrating an overlapping portion between local dimming regions in a backlight unit according to an exemplary embodiment.
  • 12A is a diagram illustrating the intensity of light output from a conventional local dimming area.
  • 12B is a diagram illustrating an intensity of light output from a local dimming area of a backlight unit according to an exemplary embodiment.
  • the identification code is used for convenience of description, and the identification code does not describe the order of each step, and each step may be performed differently from the specified order unless the specific order is clearly stated in the context. have.
  • FIG. 1 is a view illustrating an exterior of a display device including a backlight unit 200 according to an embodiment
  • FIG. 2 is an exploded view of a display device including a backlight unit 200 according to an embodiment
  • FIG. 3 is an exploded view of the backlight unit 200 according to an exemplary embodiment.
  • a display device 1 including a backlight unit 200 may be a device capable of processing image data received from the outside and visually displaying an image.
  • the display device 1 may be implemented as a TV, but the embodiment of the display device 1 is not limited thereto.
  • the display device 1 may implement a computer monitor, or may be included in a navigation terminal device or various portable terminal devices.
  • the portable terminal device may include a notebook computer, a smart phone, a tablet PC, a personal digital assistant (PDA), and the like.
  • the display device 1 forms an exterior and includes a body 10 that accommodates or supports various components constituting the display device 1 , and a liquid crystal panel 161 that displays an image.
  • the main body 10 may be provided with an input button 111 for receiving a user's command related to power on/off, volume control, channel control, and screen mode switching of the display device 1 .
  • a remote controller is provided separately from the input button 111 provided on the main body 10 to receive a user's command related to the control of the display apparatus 1 .
  • various components for displaying an image on the liquid crystal panel 161 may be provided inside the main body 10 .
  • the main body 10 As shown in FIG. 2 , the backlight unit 200 emitting surface light forward, and the liquid crystal that blocks or passes the light emitted from the backlight unit 200 .
  • the panel 161 , a power assembly 145 for supplying power to the liquid crystal panel 161 and the backlight unit 200 , and a control assembly 155 for controlling operations of the liquid crystal panel 161 and the backlight unit 200 . may include.
  • the body 10 includes a bezel 102 , a frame middle mold 103 , a bottom chassis 104 , and a rear cover 105 .
  • the bezel 102 , the frame middle mold 103 , the bottom chassis 104 , and the rear cover 105 include the power assembly 145 , the control assembly 155 , the liquid crystal panel 161 , and the backlight unit 200 . can be supported and fixed.
  • the liquid crystal panel 161 displays image data by controlling the amount of light transmitted through the substrate by applying a grayscale voltage to the liquid crystal layer provided with the liquid crystal material having anisotropic dielectric constant injected between the two substrates.
  • the liquid crystal panel 161 may include a plurality of pixels.
  • a pixel is a minimum unit constituting a screen displayed through the liquid crystal panel 161, and is also referred to as a dot or a pixel.
  • Each pixel may receive an electrical signal representing image data and output an optical signal corresponding to the received electrical signal.
  • the optical signals output from the plurality of pixels included in the liquid crystal panel 161 may be combined to display image data on the liquid crystal panel 161 .
  • a pixel electrode is provided in each pixel, and is connected to a gate line and a source line.
  • the gate line and the source line may be configured by a method known to those skilled in the art, and detailed description thereof will be omitted.
  • the display device 1 may be provided with a backlight unit 200 for projecting light to the liquid crystal panel 161 .
  • the display device 1 can display desired image data by adjusting the intensity of the grayscale voltage applied to the liquid crystal layer of the liquid crystal panel 161 to control the transmittance of light passing through the liquid crystal layer.
  • the display device 1 controls the intensity of the voltage applied to the plurality of light emitting devices of the backlight unit 200 to control the intensity of light differently for each region, thereby improving the contrast ratio. have.
  • the display apparatus 1 may adjust the intensity of light in each local dimming area based on image data output from the local dimming area of the backlight unit 200 .
  • a strong current may be applied to the light emitting devices included in the local dimming area where the white color should be output, and no current may be applied to the light emitting devices included in the local dimming area where the black color should be output.
  • the backlight unit 200 may be implemented as a direct type or an edge type, and in addition, may be implemented in various types known to those skilled in the art. Hereinafter, an example in which the backlight unit 200 is provided as a direct type will be described. However, the disclosed embodiment is not limited to the above example, and the backlight unit 200 may be implemented in various known forms.
  • the backlight unit 200 includes a light emitting element array 230 and 231 for generating light, a reflective sheet 201 for reflecting light, and a diffuser plate 202 for dispersing light. , may include an optical sheet 203 for improving light luminance.
  • the light emitting device arrays 230 and 231 are provided at the rearmost portion of the backlight unit 200 and may include a plurality of light emitting devices 230 .
  • the light emitting device 230 may emit light based on a control signal of the control assembly 155 , and may include a separate driving circuit for each light emitting device 230 .
  • the plurality of light emitting devices 230 may be disposed in parallel to each other to face the liquid crystal panel 161 , and may emit light toward the front.
  • the light emitting device arrays 230 and 231 may include a support 231 for supporting and fixing the plurality of light emitting devices 230 .
  • the plurality of light emitting devices 230 may be arranged in a predetermined arrangement to have uniform luminance.
  • the plurality of light emitting devices 230 may be disposed on the support 231 in a matrix form.
  • the form in which the plurality of light emitting devices 232 are disposed on the support 231 may vary.
  • the plurality of light emitting devices 230 are light emitting diodes (LED), organic light emitting diodes (OLEDs), or quantum dot organic light emitting diodes (quantum dot-) capable of emitting light based on the supplied current.
  • LED light emitting diodes
  • OLEDs organic light emitting diodes
  • quantum dot- quantum dot organic light emitting diodes
  • the type of the light emitting device is not limited thereto, and any device that emits light according to a current may be included without limitation.
  • the support 231 may supply power to the plurality of light emitting devices 230 . That is, current may be applied to each of the plurality of light emitting devices 230 and power may be supplied through the support 231 .
  • the support 231 may be made of a synthetic resin including a conductive power supply line for supplying power to the plurality of light emitting devices 230 or a printed circuit board (PCB).
  • the plurality of light emitting devices 230 may be grouped to receive the same power for each group.
  • the support 231 may be configured as a printed circuit board to supply the same power to the grouped light emitting devices.
  • the plurality of light emitting devices 230 may be directly attached to the support 231 in a chip on board (COB) method.
  • the light emitting device 230 may include a light emitting diode to which a light emitting diode chip or a light emitting diode die is directly attached to the support 231 without separate packaging.
  • the light emitting device 230 may be manufactured as a flip chip type that does not include a Zener diode.
  • the flip chip type light emitting device 230 does not use an intermediate medium such as a metal lead (wire) or a ball grid array (BGA) when attaching the light emitting diode, which is a semiconductor device, to the support 231,
  • the electrode pattern of the semiconductor device may be fused to the support 231 as it is.
  • the light emitting device 230 including the flip chip type light emitting diode can be miniaturized.
  • a power supply line and a power supply pad for supplying power to the flip chip type light emitting device 230 may be provided on the support 231 .
  • the support 112 may be provided with a power supply line for supplying an electrical signal and/or power from the control assembly 155 and/or the power assembly 145 to the light emitting device 230 .
  • power may be supplied to the light emitting device 230 through a power supply line and a feeding pad, and when power is supplied, the light emitting device 230 may emit light.
  • a pair of feeding pads corresponding to each of the pair of electrodes provided in the flip-chip type light emitting device 230 may be provided.
  • all of the first light emitting devices included in the first light emitting device group 230 - 1 are connected to the first line on the printed circuit board, and the second light emitting device included in the second light emitting device group 230 - 2 . All of them may be connected to a second line different from the first line.
  • the support 231 may supply first power to all the light emitting devices included in the first light emitting device group 230-1, respectively, based on the first control signal received from the control assembly 155, and the control assembly ( Second power may be supplied to all the light emitting devices included in the second light emitting device group 230 - 2 based on the second control signal received from the 155 .
  • the wire connected to the light emitting devices included in the first light emitting device group 230 - 1 and the wire connected to the light emitting devices included in the second light emitting device group 230 - 2 transmit different control signals.
  • all of the first light emitting devices included in the first light emitting device group 230 - 1 are connected to the first wire
  • all of the second light emitting devices included in the second light emitting device group 230 - 2 are second emitting devices. It may be connected to a second wire different from the first wire.
  • each of the first light emitting devices included in the first light emitting device group 230-1 is the second light emitting device group. It should be understood that light is output based on a control signal independent of each of the second light emitting devices included in the device group 230 - 2 .
  • each of the first light emitting elements may output light of a first brightness corresponding to the first control signal
  • each of the second light emitting elements may output a second light emitting element corresponding to a second control signal independent of the first control signal. It can output light of 2 brightness.
  • a grouping form of the plurality of light emitting devices 230 for local dimming control of the backlight unit 200 will be described later with reference to FIGS. 4 to 10 .
  • the reflective sheet 201 may be provided in front of the light emitting device arrays 230 and 231 , and may reflect light traveling backward of the backlight unit 200 forward.
  • Through-holes 201a are formed in the reflective sheet 201 at positions corresponding to the plurality of light emitting devices 230 . Also, the plurality of light emitting devices 230 may pass through the through hole 201a and protrude in front of the reflective sheet 201 . Since the plurality of light emitting devices 230 emit light in various directions from the front of the reflective sheet 201 , some of the light emitted from the plurality of light emitting devices 230 may travel backward. The reflective film included in the reflective sheet 201 may forward light emitted from the light emitting element backward.
  • the optical sheet 203 may include various sheets for improving luminance and uniformity of luminance.
  • the optical sheet 203 may include a diffusion sheet, a first prism sheet, a second prism sheet, and a reflective polarizing sheet.
  • the backlight unit 200 may further include a quantum dot film (not shown) capable of converting a wavelength of light emitted from the light emitting device according to an embodiment.
  • the quantum dot film may be provided between the diffusion plate 202 and the optical sheet 203 .
  • the backlight unit 200 may include various sheets according to embodiments.
  • the backlight unit 200 includes a plurality of transparent resins (not shown) formed to surround the plurality of light emitting devices 230 instead of including a quantum dot film, and a plurality of light emitting devices 230 emitted from It may include a plurality of light conversion layers (not shown) provided to convert the wavelength of light and surround the outer peripheral surface of the plurality of transparent resins.
  • the transparent resin may be formed by dispensing a liquid molding material to the light emitting device 230 and then curing.
  • the transparent resin may be silicone or epoxy resin, and when dispensed on the light emitting device 230 , it may be spread by gravity to surround the light emitting device 230 . Accordingly, the transparent resin may have a substantially dome shape, and may be formed to be in contact with the light emitting surface and the side surface of the light emitting device 230 .
  • the transparent resin may be provided to cover the support 231 adjacent to the light emitting device 230 .
  • the transparent resin may be provided such that a predetermined distance is generated between the outer circumferential surface of the transparent resin and the light emitting surface in a direction in which the light emitting surface of the light emitting device 230 faces. This is to arrange the light conversion layer so that a predetermined distance is formed between the light conversion layer, which will be described later, and the light emitting surface of the light emitting device 230 .
  • light emitted from the light emitting device 230 disposed behind the liquid crystal panel 161 may be directly irradiated to the liquid crystal panel 161 .
  • the amount of light is concentrated in a region on the liquid crystal panel 161 positioned perpendicular to the light emitting surface of the light emitting device 230 , so that the luminance of the liquid crystal panel 161 is not uniform.
  • the transparent resin according to an embodiment of the present invention is provided in a dome shape on the light emitting device 230, the light direction angle of the light irradiated from the light emitting surface may be widened.
  • the light direction angle of light can be easily adjusted.
  • a light conversion layer including quantum dots may be disposed on the outer circumferential surface of the transparent resin.
  • the light conversion layer may be spread by gravity to surround the transparent resin.
  • the plurality of quantum dots disposed on the light conversion layer may convert a wavelength of some of the blue light emitted from the light emitting device 230 into mixed light of green light and red light or yellow light.
  • FIG. 4 is a diagram for explaining a local dimming area applied to a conventional local dimming technique.
  • light emitting devices included in each of the conventional local dimming regions are arranged in a matrix form.
  • the light emitting devices included in each local dimming area are arranged in a 4X4 matrix.
  • the local dimming area may be expressed in a rectangular shape.
  • the first local dimming region may be composed of light emitting elements belonging to the first light emitting element group
  • the second local dimming area may be composed of light emitting elements belonging to the second light emitting element group
  • the third local dimming area may include
  • the light emitting device may be comprised of light emitting devices belonging to the third light emitting device group
  • the fourth local dimming region may be comprised of light emitting devices belonging to the fourth light emitting device group.
  • the intensity of light output between the first local dimming area and the fourth local dimming area is significantly lower than the intensity of light output from the center of each of the first local dimming area and the fourth local dimming area.
  • the intensity of light output from the lower right vertex of the first local dimming region and the upper left vertex of the fourth local dimming region is the intensity of light output from the two light emitting devices, the first local dimming region and the second 4 The intensity of the light output from the center of each of the local dimming areas is significantly lower.
  • a backlight unit 200 according to an embodiment for solving the above problems will be described with reference to FIGS. 5 to 10 .
  • 5 to 10 are diagrams illustrating a local dimming area of a backlight unit according to various embodiments of the present disclosure
  • the backlight unit 200 includes a first light emitting device group including a plurality of first light emitting devices that emit light based on a first control signal, and a second control signal based on a second control signal.
  • a second light emitting element group including a plurality of second light emitting elements that emit light by using and a fourth light emitting device group including a plurality of fourth light emitting devices.
  • the first light emitting device group may correspond to the first local dimming region
  • the second light emitting device group may correspond to the second local dimming region
  • the third light emitting device group may correspond to the third local dimming region
  • the fourth light emitting device group may correspond to the fourth local dimming region.
  • the arrangement of the light emitting elements included in each local dimming area will be described based on the first light emitting element group, but the first light emitting element group may be any local dimming area among the plurality of local dimming areas provided in the backlight unit 200 . It should be understood as a group of light emitting devices included in the dimming region.
  • P103) and the nearest four light emitting devices may include at least two second light emitting devices belonging to the second light emitting device group.
  • the four light emitting devices closest to each of some of the second light emitting devices may include at least two first light emitting devices belonging to the first light emitting device group.
  • some of the first light emitting elements belonging to the first light emitting element group (P51, P52, P61, P62, P71, P81, P91, P92, P101, P102, P103) have at least two surfaces among the four surfaces. It may be surrounded by the second light emitting devices.
  • At least two of the first light emitting devices (P51, P52, P61, P62, P71, P81, P91, P92, P101, P102, P103) of some of the first light emitting devices belonging to the first light emitting device group
  • the adjacent local dimming region is surrounded by the second light emitting elements, and at least two surfaces of the second light emitting elements of some of the second light emitting elements belonging to the second light emitting element group are surrounded by the first light emitting elements. It can prevent light leakage between the liver.
  • the four light emitting devices closest to each of some of the first light emitting devices may not include the first light emitting device.
  • each light emitting device group may include a light emitting device satisfying the condition that four adjacent light emitting devices do not correspond to its own light emitting device group.
  • the four light emitting devices closest to each of some of the first light emitting devices P81 , P91 and P102 are all second light emitting devices belonging to the second light emitting device group can be
  • all four surfaces of a light emitting device included in an arbitrary local dimming area may be surrounded by light emitting devices included in an adjacent local dimming area.
  • the four light emitting devices closest to each of some of the first light emitting devices P52, P62, P71, P82, P92, P101, and P103 are at least one light emitting device belonging to the third light emitting device group.
  • 3 may include a light emitting device.
  • four adjacent light emitting devices may be two second light emitting devices, one third light emitting device, and one fourth light emitting device.
  • four adjacent light emitting devices P52, P62, P82, P92, P101, and P103 may be two second light emitting devices and two third light emitting devices. .
  • any light emitting element included in any local dimming area may be surrounded by the light emitting elements included in an adjacent local dimming area, which may cause the local dimming areas to overlap.
  • the light emitting device groups included in each local dimming region may include at least four light emitting devices disposed in the center, and the at least four light emitting devices may be disposed in a 2X2 matrix form. .
  • first light emitting devices belonging to the first light emitting device group four first light emitting devices may be arranged in a 2X2 matrix shape.
  • the intensity of light output from the center of each local dimming area may be further increased.
  • the light emitting device group included in each local dimming area includes at least one light emitting device spaced apart from each other, thereby generating at least one empty space.
  • light emitting devices of a light emitting device group included in an adjacent local dimming region are disposed, but in the case of a local dimming region existing in a corner or a vertex of the support 231, top, bottom, A local dimming area adjacent to at least one of the left and right directions may not exist.
  • the local dimming region present in the corner portion or the vertex portion of the support 231 may further include light emitting devices for filling the empty space.
  • the local dimming region corresponding to the vertex portion of the support 231 may include a light emitting element group including a larger number of light emitting elements than the local dimming region corresponding to the corner portion of the support 231, and the support ( The local dimming region corresponding to the corner portion of the support 231 may include a greater number of light emitting devices than the local dimming region not corresponding to the vertex portion and the corner portion of the support 231 .
  • the number of the plurality of first light emitting devices belonging to the first light emitting device group is the second light emitting device group. It may be different from the number of the plurality of third light emitting devices belonging to the device group.
  • the number of the plurality of second light emitting devices belonging to the second light emitting device group is the same as the number of the plurality of third light emitting devices belonging to the third light emitting device group, and the plurality of second light emitting devices belonging to the second light emitting device group The number of may be greater than the number of the plurality of fourth light emitting devices belonging to the fourth light emitting device group.
  • the arrangement of the first light emitting devices belonging to the first light emitting device group may be different from the arrangement of the light emitting devices belonging to the second, third, and fourth light emitting device groups.
  • the arrangement of light emitting devices according to various embodiments described with reference to FIGS. 5 to 10 is exemplary, and any arrangement of light emitting devices satisfying the conditions described above or to be described later may be employed.
  • the plurality of light emitting devices 230 provided in a matrix form in the backlight unit 200 may first overlap any first overlapping light emitting devices P51, P52, P62, P71, P81, P82, P91, P92, P102, and P103.
  • the light emitting devices P51, P52, P62, P71, P81, P82, P91, P92, P102, and P103 are disposed in a row closest to the row in which the light emitting devices P51, P52, P62, and P71 are disposed, and the first overlapping light emitting devices P51, P52, P62, P71 , P81, P82, P91, P92, P102, P103 may include two second overlapping light emitting devices disposed in a column disposed, and the first overlapping light emitting devices P51, P52, P62, P71, P81, P82, P91, P92, P102, P103) and the two second overlapping light emitting devices may emit light based on different control signals.
  • the first overlap light emitting devices P51, P52, P62, P71, P81, P82, P91, P92, P102, and P103 are disposed in the same column and included in a different local dimming area from the second overlap light emitting devices disposed in adjacent rows.
  • the first overlapping light emitting devices P51, P52, P62, P71, P81, P82, P91, P92, P102, and P103 are disposed in the same column and the second overlapping light emitting devices disposed in adjacent rows have the same local dimming region.
  • the light may be emitted based on the same control signal by being included in the , or may be included in different local dimming regions to emit light based on different control signals.
  • the backlight unit 200 is disposed in a column closest to the row in which the first overlapping light emitting devices P51, P52, P61, P62, P71, P81, P82, P91, P92, P101, P102, and P103 are disposed, and the first The overlapping light emitting devices P51, P52, P61, P62, P71, P81, P82, P91, P92, P101, P102, and P103 may include two third overlapping light emitting devices disposed in a row, the first The overlapping light emitting devices P51, P52, P61, P62, P71, P81, P82, P91, P92, P101, P102, and P103 and the two third overlapping light emitting devices may emit light based on different control signals.
  • the first overlapping light emitting devices P51, P52, P61, P62, P71, P81, P82, P91, P92, P101, P102, and P103 are disposed in the same row and different from the third overlapping light emitting devices disposed in adjacent columns. It may be included in the dimming area.
  • the first overlapping light emitting devices P51, P52, P61, P62, P71, P81, P82, P91, P92, P101, P102, P103 and the third overlapping light emitting devices disposed in adjacent columns each other They may be included in the same local dimming region to emit light based on the same control signal, or they may be included in different local dimming regions to emit light based on different control signals.
  • a second overlap light emitting device disposed in the same column as the first overlap light emitting devices P81 , P91 and P102 and disposed in an adjacent row, and the first overlap light emitting device P81 , P91 , and P102 disposed in the same row as and adjacent to each other
  • the third overlapping light emitting devices disposed in the column may be included in the same local dimming region to emit light based on the same control signal.
  • the backlight unit 200 is disposed in a column closest to the column in which the first overlapping light emitting device P71 is disposed, and four fourth fourth devices disposed in the row closest to the row in which the first overlapping light emitting device P71 is disposed.
  • An overlapping light emitting device may be included, and the first overlapping light emitting device P71 and the four fourth overlapping light emitting devices may emit light based on different control signals.
  • the first overlap light emitting device P71 may be included in a different local dimming area from the fourth overlap light emitting device disposed at a diagonal position.
  • two fourth overlapping light emitting devices among the four fourth overlapping light emitting devices may emit light based on the same control signal.
  • two fourth overlapping light emitting devices among the four fourth overlapping light emitting devices may be light emitting devices belonging to the same local dimming region.
  • FIG. 11 is a diagram illustrating overlapping portions between local dimming regions in the backlight unit 200 according to an embodiment
  • FIG. 12A is a diagram illustrating the intensity of light output from a conventional local dimming region
  • FIG. 12B is an embodiment A diagram showing the intensity of light output from the local dimming area of the backlight unit 200 according to FIG.
  • a plurality of local dimming areas formed in the backlight unit 200 may overlap with adjacent local dimming areas.
  • the light intensity of the diagonal component may be constantly maintained due to the light emitting devices in the overlapping region.
  • each local dimming area of the backlight unit 200 is evenly distributed without being concentrated in the center of each local dimming area, thereby preventing light leakage. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

Une unité de rétroéclairage, empêchant une fuite de lumière entre des zones de gradation locale et comportant une pluralité d'éléments électroluminescents agencés sous une forme de matrice, comprend : un premier groupe d'éléments électroluminescents, comportant une pluralité de premiers éléments électroluminescents d'émission lumineuse en fonction d'un premier signal de commande ; et un second groupe d'éléments électroluminescents, comportant une pluralité de seconds éléments électroluminescents d'émission lumineuse en fonction d'un second signal de commande. Quatre éléments électroluminescents, respectivement au plus près de certains des premiers éléments électroluminescents de la pluralité de premiers éléments électroluminescents, comportent au moins deux seconds éléments électroluminescents du second groupe d'éléments électroluminescents.
PCT/KR2020/015959 2020-03-06 2020-11-13 Unité de rétroéclairage WO2021177546A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2020-0028238 2020-03-06
KR1020200028238A KR20210112780A (ko) 2020-03-06 2020-03-06 백라이트 유닛

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WO2021177546A1 true WO2021177546A1 (fr) 2021-09-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011065825A (ja) * 2009-09-16 2011-03-31 Motoko Ishii Lighting Design Inc Ｌｅｄ照明システム
US20130057593A1 (en) * 2011-09-05 2013-03-07 Canon Kabushiki Kaisha Lighting apparatus
KR20140094806A (ko) * 2013-01-23 2014-07-31 엘지전자 주식회사 양자점 복합 필름 및 이를 이용한 백라이트 유닛
KR101621550B1 (ko) * 2009-08-28 2016-05-17 엘지전자 주식회사 광학 어셈블리, 그를 구비한 백라이트 유닛 및 디스플레이 장치
KR20170027399A (ko) * 2015-09-02 2017-03-10 엘지이노텍 주식회사 발광 모듈 및 조명 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101621550B1 (ko) * 2009-08-28 2016-05-17 엘지전자 주식회사 광학 어셈블리, 그를 구비한 백라이트 유닛 및 디스플레이 장치
JP2011065825A (ja) * 2009-09-16 2011-03-31 Motoko Ishii Lighting Design Inc Ｌｅｄ照明システム
US20130057593A1 (en) * 2011-09-05 2013-03-07 Canon Kabushiki Kaisha Lighting apparatus
KR20140094806A (ko) * 2013-01-23 2014-07-31 엘지전자 주식회사 양자점 복합 필름 및 이를 이용한 백라이트 유닛
KR20170027399A (ko) * 2015-09-02 2017-03-10 엘지이노텍 주식회사 발광 모듈 및 조명 장치

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