WO2019010980A1 - 背光模组及其控制方法、显示装置 - Google Patents

背光模组及其控制方法、显示装置 Download PDF

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Publication number
WO2019010980A1
WO2019010980A1 PCT/CN2018/076417 CN2018076417W WO2019010980A1 WO 2019010980 A1 WO2019010980 A1 WO 2019010980A1 CN 2018076417 W CN2018076417 W CN 2018076417W WO 2019010980 A1 WO2019010980 A1 WO 2019010980A1
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WIPO (PCT)
Prior art keywords
backlight module
guide plate
light
light guide
digital micromirror
Prior art date
Application number
PCT/CN2018/076417
Other languages
English (en)
French (fr)
Inventor
程鹏飞
陈雷
冯绪清
高斐
马鑫
王雪绒
禹璐
孙川
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/099,545 priority Critical patent/US10663796B2/en
Publication of WO2019010980A1 publication Critical patent/WO2019010980A1/zh

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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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • 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
    • 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
    • G02F1/133601—Illuminating devices for spatial active dimming
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/44—Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/24—Function characteristic beam steering
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/62—Switchable arrangements whereby the element being usually not switchable

Definitions

  • the present disclosure relates to a backlight module, a control method thereof, and a display device.
  • the backlight module provides a light source for a liquid crystal display (LCD) and is an important component of the LCD.
  • LCD liquid crystal display
  • a conventional backlight module includes a light guide plate and a reflection sheet disposed on a side of the light guide plate away from the light exit surface.
  • the main function of the reflective sheet is to return the light transmitted from under the light guide plate back to the light guide plate to improve the brightness of the backlight module.
  • the reflective film is a monolithic film, and the reflectance in the entire film region is substantially uniform, so that the light reflected to the light guide plate is substantially uniform in each region.
  • the area brightness control is a regionalized control of the brightness of the backlight. It is important to improve the dynamic range of the display, improve the area contrast, and achieve a high dynamic range (High-Dynamic Range, HDR for short).
  • the brightness is usually changed by adjusting the light source.
  • the brightness adjustment method increases or decreases the brightness of the entire light-emitting area at the same time, and the regional control of the brightness cannot be realized.
  • Some embodiments of the present disclosure provide a backlight module including a light guide plate disposed on at least one digital micromirror device on a side of the light guide plate away from the light exit surface, the at least one digital micromirror device including a plurality of micromirrors, and The reflective surface of the micromirror faces the light guide plate.
  • an edge portion of the at least one digital micromirror device is coupled to the light guide plate, and a gap is formed between an inner side of an edge portion of the at least one digital micromirror device and the light guide plate.
  • an edge portion of the at least one digital micromirror device is sealingly coupled to the light guide plate, the void being evacuated.
  • the at least one digital micromirror device includes a plurality of digital micromirror devices, and the plurality of digital micromirror devices are spliced together.
  • the plurality of micromirrors of the digital micromirror device are configured to be independently controlled such that an angle between a reflective surface of the micromirror and a light exiting surface of the light guide plate changes.
  • each of the micromirrors is configured to be switchable between a state in which its reflective surface is parallel to the light guide plate and a state in which the light guide plate is deflected in two opposite directions to each other.
  • the backlight module further includes a light source disposed at a side of the light guide plate; or the light source is disposed on an opposite side of the light emitting surface of the light guide plate and at the light guide plate and the at least Between a digital micromirror device.
  • the micromirror of the digital micromirror device includes a silver reflective layer for forming a reflective surface.
  • the backlight module further includes an optical film disposed on a side of the light-emitting surface of the light guide plate.
  • the optical film includes a diffusion sheet, a lower prism sheet, and an upper prism sheet that are sequentially disposed on a side of the light-emitting surface of the light guide plate.
  • the sum of the areas of the reflective faces of the plurality of micromirrors of the at least one digital micromirror device is substantially equal to the area of the light exit face of the light guide plate.
  • a reflective surface of an adjacent micromirror of the plurality of micromirrors touch each other.
  • Some embodiments of the present disclosure provide a display device, including the backlight module and the display panel, and the backlight module is disposed on a light incident surface side of the display panel.
  • Some embodiments of the present disclosure provide a control method of a backlight module according to any one of the preceding claims, comprising: performing an area on the backlight module by controlling a plurality of micromirrors in the at least one digital micromirror device Brightness control.
  • performing area brightness control on the backlight module includes dividing the backlight module into a plurality of backlight partitions, and controlling a backlight partition adjacent to a predetermined one of the plurality of backlight partitions
  • the micromirror is rotated to reflect light emitted from the light guide plate to the micromirror to the predetermined backlight partition.
  • FIG. 1 is a schematic view 1 of a backlight module provided by the present disclosure
  • FIG. 2 is a schematic diagram 2 of a backlight module provided by the present disclosure
  • FIG. 3 is a schematic diagram of a micromirror array in a digital micromirror device according to the present disclosure
  • FIG. 4a is a schematic view showing a micromirror in a flat state according to the present disclosure
  • 4b is a schematic view of a micromirror after being rotated according to the present disclosure
  • FIG. 5 is a schematic diagram of a light guide plate provided as a micro mirror protection board according to the present disclosure
  • FIG. 6 is a schematic diagram 3 of a backlight module provided by the present disclosure.
  • 10-light guide plate 101-light-emitting surface; 20-digital micro-mirror device; 201-micromirror; 30-optical film; 301-diffusion sheet; 302-lower prism sheet; 303-upper prism sheet.
  • the embodiment of the present disclosure provides a backlight module, as shown in FIG. 1 and FIG. 2, including a light guide plate 10, and at least one digital micromirror device (Digital Micromirror Device, DMD) disposed on a side of the light guide plate 10 away from the light exit surface 101. ) 20.
  • DMD Digital Micromirror Device
  • At least one of the digital micromirror devices 20 includes a plurality of micromirrors 201, and the reflecting surface of the micromirrors 201 faces the light guide plate 10. Therefore, light emitted from the opposite side of the light-emitting surface of the light guide plate 10 can be reflected back to the light guide plate again through the reflection surface of the micromirror 201.
  • the digital micromirror device 20 is an array device composed of a plurality of micromirrors 201.
  • FIG. 3 only schematically shows four digital micromirror devices 20, but embodiments in accordance with the present disclosure are not limited thereto.
  • Each of the micromirrors 201 has three angles to control the change, the three angles are ⁇ (the micromirror 201 is in a flat state when ⁇ is 0), ⁇ ; ⁇ can be 10°, 12°, 17°, and the like. That is to say, each of the micromirrors 201 can be switched between a state in which the reflecting surface is parallel to the light guiding plate and a state in which it is deflected with respect to the opposite directions of the light guiding plate toward each other.
  • the micromirror 201 may be in a flat state in a state in which the reflecting surface of the micromirror 201 is parallel to the light emitting surface of the light guide plate.
  • the digital micromirror device 20 reflects the light transmitted from the light guide plate 10 substantially uniformly back to the light guide plate 10 in the entire region of the light guide plate 10.
  • the function of the digital micromirror device 20 is the same as that of a conventional reflecting sheet.
  • FIG. 4b shows two micromirrors with angles at ⁇ + ⁇ and ⁇ - ⁇ , respectively.
  • the micromirror 201 is a tiny mirror that reflects light incident thereon.
  • the plurality of micromirrors of the digital micromirror device are configured to be independently controlled such that the angle between the reflective surface of the plurality of micromirrors and the light exiting surface of the light guide plate changes.
  • the digital micromirror device can externally drive the drive circuit to enable multiple micromirrors in the digital micromirror device to be controlled independently of each other.
  • the digital micromirror device itself may be integrated with a driving device.
  • an external drive circuit or an integrated drive device can receive image display information and then drive a plurality of micromirrors to rotate based on the image display information.
  • the plurality of micromirrors can be independently controlled, different regions can be controlled differently to adjust the local light output intensity of the backlight module. For example, if the light intensity required by the two regions is different, then the micromirror corresponding to the two regions can be controlled to rotate, so that the light corresponding to one region is reflected by the micromirror into another region, thereby realizing the local area of the backlight module. Adjustment of light intensity.
  • the digital micromirror device 20 can be equivalent to a reflective sheet when it is disposed on the side of the light guide plate 10 that is away from the light exiting surface 101.
  • At least one digital micromirror device 20 disposed on the side of the light guide plate 10 away from the light exit surface 101 should be capable of guiding The entire area of the light panel 10 is reflected.
  • one or several digital micromirror devices 20 may be disposed on the side of the light guide plate 10 away from the light exit surface 101; when the light guide plate When the size of 10 is large, more digital micro-mirror devices 20 can be selected to be disposed on the side of the light guide plate 10 away from the light-emitting surface 101.
  • the shape of the light guide plate 10 is not limited, and may be a flat plate shape as shown in FIGS. 1 and 2, or may be other shapes such as a wedge shape.
  • At least one of the digital micromirror devices 20 can be along a plane of the light guide plate 10 away from the side of the light exit surface 101 (the plane is opposite to the light exit surface 101). Plane) settings.
  • the sum of the areas of the reflection surfaces of the plurality of micromirrors of the digital micromirror device is substantially equal to the area of the light exit surface of the light guide plate, so that each region of the light guide plate has a micro mirror corresponding to the light of each region.
  • edges of the reflecting faces of adjacent micromirrors of the plurality of micromirrors are in contact with each other as shown in FIG. 4a.
  • the backlight module may further include a back plate, a plastic frame, and the like that fix the light guide plate 10, the digital micromirror device 20, and the like.
  • the control board that controls the digital micromirror device 20 can be located in the backlight module or can be disposed independently of the backlight module.
  • the control board of the digital micromirror device 20 can be connected to the control board outside the backlight module through a connection line such as a flexible circuit board (FPC) or the like.
  • FPC flexible circuit board
  • control panel of the digital micromirror device 20 can be disposed independently of the backlight module.
  • the backlight module can be disposed at other positions of the display device. At the office.
  • the embodiment of the present disclosure provides a backlight module.
  • a backlight module By providing at least one digital micromirror device 20 on the side of the light guide plate 10 away from the light exit surface 101, and by controlling the micro mirror 201 in the digital micromirror device 20, a specific region can be obtained.
  • the micromirror 201 rotates to cause the rotated micromirrors 201 to reflect light to a certain area, and the brightness of the area is increased, thereby achieving the purpose of area brightness control. Based on this, when the backlight module is applied to a display device, the dynamic range of the display can be improved, the area contrast can be improved, and a high dynamic range can be realized.
  • the plurality of digital micromirror devices 20 are spliced together.
  • the plurality of digital micromirror devices 20 are spliced together, that is, the plurality of digital micromirror devices 20 are closely arranged and the reflecting faces of the micromirrors 201 are on the same plane.
  • the backlight module of the present disclosure can be adapted to a large-sized display device.
  • a plurality of digital micro-mirror devices 20 are spliced together, and the spliced digital micro-mirror device 20 can have better area brightness control. performance.
  • the light guide plate 10 is also used as a protective plate for the micromirrors 201 in the digital micromirror device 20.
  • the digital micromirror device 20 generally employs a whole piece of high transmittance, high hardness glass as a protective plate over the micro mirror 201.
  • the original protective plate can be removed, so that the light guide plate 10 functions to protect the micromirror 201.
  • the micromirror 201 needs to be rotated, as shown in FIG. 5, a gap is left between the light guide plate 10 and the micromirror 201, and the edges of the light guide plate 10 and the digital micromirror device 20 can be bonded to each other. Together, do vacuuming.
  • the edge portion of the digital micromirror device 20 may be sealed to the light guide plate by the sealing member 202, and a gap is formed between the inner side of the edge portion of the digital micromirror 20 and the light guide plate.
  • the two micromirrors 201 are shown schematically in FIG. 5 for convenience of illustration, but the digital micromirrors 20 may include more micromirrors. As shown in FIG.
  • the digital micromirror device 20 itself may include a substrate on which the micromirrors are formed so as to form a sealed space between the substrate and the light guide plate.
  • a sealed space may be formed by other substrates.
  • the thickness of the backlight module can be further reduced, and the product is lighter and thinner.
  • the micromirror 201 includes a silver reflective layer for forming a reflective surface.
  • the reflectance can be further improved by using a silver reflective layer with respect to the aluminum reflective layer.
  • the backlight module further includes an optical film 30 disposed on a side of the light-emitting surface 101 of the light guide plate for optical improvement of different purposes.
  • the optical film 30 includes a diffusion sheet 301, a lower prism sheet 302, and an upper prism sheet 303 which are sequentially disposed on the side of the light-emitting surface 101 of the light guide plate. In this way, the uniformity of the light emitted from the backlight module can be made better.
  • the backlight module further includes a light source 102 of a light emitting diode disposed on a side of the light guide plate 10, as shown in FIG.
  • the light source 102 is only schematically shown on one side of the light guide plate 10 in FIG. 2, but the embodiment according to the present disclosure is not limited thereto.
  • the light source 102 is a (Light Emitting Diode, LED for short) light bar. LED has the advantages of small size, low power consumption and long service life.
  • the embodiment of the present disclosure further provides a display device, including the above backlight module, and further includes a display panel.
  • the backlight module is disposed on a side of the light incident surface of the display panel, so that the backlight module can provide a light source for the display panel.
  • the display panel may be a liquid crystal display panel requiring a backlight source, but embodiments according to the present disclosure are not limited thereto.
  • the display device using the backlight module can improve the dynamic range of the display device, improve the area contrast, and achieve a high dynamic range.
  • the display device may be a television, a notebook computer, a tablet computer, a smart phone, or the like.
  • the embodiment of the present disclosure further provides a control method of the backlight module, including: controlling the area brightness of the backlight module by controlling the micro mirror 201 in the digital micromirror device 20. It has the same technical effects as the backlight module described above, and will not be described herein.
  • the micromirror 201 when the micromirror 201 is rotated, that is, when the angle ⁇ is rotated, as shown in FIG. 4b, the light transmitted from the light guide plate 10 can be reflected in a specific direction. Based on this, by controlling the micromirror 201 in the digital micromirror device 20, the micromirrors 201 of a specific region are rotated, so that the rotated micromirrors 201 reflect the light to a certain region, and the brightness of the region is Improve to achieve the purpose of regional brightness control. In this case, it can be considered that the backlight module operates in a mode in which the area brightness is controlled.
  • the area brightness control is performed on the backlight module, including: dividing the backlight module into a plurality of backlight partitions, and controlling the micro mirror 201 in the backlight partition adjacent to the predetermined backlight partition to rotate to reflect the light to Scheduled backlight partitioning.
  • the backlight module is divided into a plurality of regions.
  • the micromirror 201 in the backlight partition adjacent to the backlight partition can be controlled to rotate, so that the light guide plate
  • the light emitted by the 10 and directed to the rotated micromirrors 201 can be reflected and reflected into one or more backlight partitions, thereby increasing the brightness of the backlight partition and the backlight partition adjacent to the backlight partition.
  • the brightness is lower.
  • the division of the backlight partition needs to be consistent with the area division of the display panel, so as to ensure that the backlight partition with higher brightness corresponds to the area with higher brightness on the display panel.
  • control method further includes controlling all of the micromirrors 201 to be in a flat state.
  • the digital micromirror device 20 reflects the light transmitted from the light guide plate 10 substantially uniformly back to the light guide plate 10 in the entire region of the light guide plate 10.
  • the function of the digital micromirror device 20 is the same as that of the ordinary reflecting sheet. At this time, it can be considered that the backlight module operates in the normal mode.
  • the backlight module can have two working modes, so that the backlight module can be applied more widely.
  • the backlight module and the control method thereof and the display device provided by the embodiment of the present disclosure can provide at least one digital micromirror device on the side of the light guide plate away from the light emitting surface, and can control the micro mirror in the digital micromirror device.
  • the micromirrors of a specific area are rotated so that the rotated micromirrors reflect light to a certain area, and the brightness of the area is increased, thereby achieving the purpose of area brightness control. Based on this, when the backlight module is applied to a display device, the dynamic range of the display can be improved, the area contrast can be improved, and a high dynamic range can be realized.

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Abstract

背光模组及其控制方法、显示装置。背光模组包括导光板（10），设置于导光板（10）的远离出光面（101）一侧的至少一个数字微镜器件（20）。至少一个数字微镜器件（20）包括多个微镜（201），微镜（201）的反射面面对导光板（20），通过控制数字微镜器件（20）中的微镜（201）对背光模组的区域亮度进行调制。

Description

背光模组及其控制方法、显示装置
本申请要求于2017年7月10日递交的中国专利申请第201710559994.4号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开涉及一种背光模组及其控制方法、显示装置。
背景技术
背光模组为液晶显示器(Liquid Crystal Display，简称LCD)提供光源，是LCD的重要组成部件。
传统的背光模组包括导光板、以及设置于导光板的远离出光面一侧的反射片。反射片起到的主要作用就是将从导光板下方透射出来的光再次返回到导光板中，提高背光模组的亮度。反射膜是一张整体的膜材，整个膜材区域内的反射率是基本一致的，因此反射给导光板的光在各区域内也是基本一致的。
区域亮度控制是能区域化的控制背光的亮度，对于提高显示的动态范围，提高区域对比度，实现高动态范围(High-Dynamic Range，简称HDR)有很重要的意义。
传统的显示背光模组需要调节亮度时，通常是通过调节光源来实现亮度的变化，但是这种调节亮度的方式会使整个出光区域的亮度同时增加或者降低，无法实现亮度的区域化控制。
发明内容
本公开的一些实施例提供一种背光模组，包括导光板，设置于导光板的远离出光面一侧的至少一个数字微镜器件，所述至少一个数字微镜器件包括多个微镜，且所述微镜的反射面面对所述导光板。
在一些示例中，所述至少一个数字微镜器件的边缘部分与所述导光板连 接，且所述至少一个数字微镜器件的边缘部分的内侧与所述导光板之间具有一空隙。
在一些示例中，所述至少一个数字微镜器件的边缘部分与所述导光板密封连接，所述空隙被抽真空。
在一些示例中，所述至少一个数字微镜器件包括多个数字微镜器件，且所述多个数字微镜器件拼接在一起。
在一些示例中，所述数字微镜器件的多个微镜被配置为独立控制，以使所述微镜的反射面与所述导光板的出光面之间的夹角改变。
在一些示例中，每个所述微镜被配置为可在其反射面平行于导光板的状态、以及相对于所述导光板朝彼此相反的两个方向偏斜的状态之间切换。
在一些示例中，背光模组还包括光源，所述光源设置在所述导光板的侧面；或者所述光源设置在所述导光板的出光面的相反侧且在所述导光板与所述至少一个数字微镜器件之间。
在一些示例中，所述数字微镜器件的微镜包括用于形成反射面的银反射层。
在一些示例中，背光模组还包括设置于所述导光板出光面一侧的光学膜片。
在一些示例中，所述光学膜片包括依次设置于所述导光板出光面一侧的扩散片、下棱镜片和上棱镜片。
在一些示例中，所述至少一个数字微镜器件的多个微镜的反射面的面积总和与所述导光板的出光面的面积大致相等。
在一些示例中，在所述至少一个数字微镜器件的多个微镜的反射面平行于所述导光板的出光面的状态下，所述多个微镜中相邻微镜的反射面的边缘彼此接触。
本公开的一些实施例提供一种显示装置，包括上述任一项所述的背光模组和显示面板，所述背光模组设置在所述显示面板的入光面一侧。
本公开的一些实施例提供一种如上述任一项所述背光模组的控制方法，包括：通过控制所述至少一个数字微镜器件中的多个微镜，对所述背光模组进行区域亮度控制。
在一些示例中，对所述背光模组进行区域亮度控制包括：将所述背光模 组划分为多个背光分区，控制与所述多个背光分区中预定的背光分区相邻的背光分区中的所述微镜进行转动，以使从所述导光板出射至所述微镜的光线反射至所述预定的背光分区。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1为本公开提供的一种背光模组的示意图一；
图2为本公开提供的一种背光模组的示意图二；
图3为本公开提供的一种数字微镜器件中微镜阵列示意图；
图4a为本公开提供的一种微镜处于平坦状态的示意图；
图4b为本公开提供的一种微镜转动后的示意图；
图5为本公开提供的一种导光板充当微镜保护板的示意图；
图6为本公开提供的一种背光模组的示意图三。
附图标记：
10-导光板；101-出光面；20-数字微镜器件；201-微镜；30-光学膜片；301-扩散片；302-下棱镜片；303-上棱镜片。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
本公开实施例提供一种背光模组，如图1和图2所示，包括导光板10，设置于导光板10的远离出光面101一侧的至少一个数字微镜器件(Digital Micromirror Device，DMD)20。
例如，至少一个数字微镜器件20包括多个微镜201，且微镜201的反射面面对导光板10。因此，从导光板10的出光面的相反侧出射的光可以经微 镜201的反射面再次反射回导光板。
如图3所示，数字微镜器件20是由若干微镜201组成的阵列器件。图3仅仅示意性示出了四个数字微镜器件20，但根据本公开的实施例不限于此。一个数字微镜器件20上可有十万甚至更多的微镜201。每一个微镜201都有三个角度可以控制变化，三个角度分别为α(α为0时微镜201处于平坦状态)、α±β；β可以为10°、12°、17°等。也就是说，每个微镜201可以在反射面平行于导光板的状态、以及相对于所述导光板的朝彼此相反的两个方向偏斜的状态之间切换。
当微镜201处于平坦状态时，例如α＝0°，如图4所示。例如，微镜201处于平坦状态可以是微镜201的反射面与导光板的出光面平行的状态。当数字微镜器件20中所有微镜201都处于平坦状态时，数字微镜器件20将导光板10透射出来的光在整个导光板10区域内基本一致的反射回导光板10。在此情况下，数字微镜器件20的作用与普通的反射片作用相同。
当微镜201转动时，即转动β角度时，如图4b所示，可使导光板10透射出来的光向特定方向反射。例如，图4b分别示出了角度处于α+β和α-β的两个微镜。基于此，通过控制数字微镜器件20中的微镜201，使特定区域的微镜201进行转动，以使这些转动后的微镜201将光反射至某一区域，而该区域的亮度就会提高，从而实现区域亮度控制的目的。
需要说明的是，微镜201即为微小的反射镜，其可对射向其的光进行反射。例如，数字微镜器件的多个微镜被配置为独立控制，以使多个微镜的反射面与所述导光板的出光面之间的夹角改变。例如，数字微镜器件可以外接驱动电路以实现数字微镜器件中的多个微镜被彼此独立地控制。或者，数字微镜器件本身可以集成有驱动器件。例如，外接的驱动电路或集成的驱动器件可以接收图像显示信息，然后根据图像显示信息驱动多个微镜转动。由于多个微镜可以被独立控制，从而可以对不同的区域进行不同的控制，从而调整背光模组的局域出光强度。例如，如果两个区域所需的光线强度不同，那么可以控制两个区域所对应的微镜转动，使得对应于一个区域的光线被微镜反射到另一个区域中，从而实现背光模组局域出光强度的调整。
由于数字微镜器件20的反光特性，当其设置于导光板10的远离出光面101一侧时，数字微镜器件20可相当于反射片。
基于此，本领域技术人员应该明白，为了反射导光板10的远离出光面101一侧出射的光，设置于导光板10的远离出光面101一侧的至少一个数字微镜器件20应能在导光板10的整个区域内进行反光。可根据导光板10和数字微镜器件20的尺寸，当导光板10的尺寸较小时，可选择一个或几个数字微镜器件20设置于导光板10的远离出光面101一侧；当导光板10的尺寸较大时，可选择更多的数字微镜器件20设置于导光板10的远离出光面101一侧。
另外，不对导光板10的形状进行限定，可以如图1和图2所示为平板形，也可以为楔形等其他形状。
不管导光板10的形状如何设定，与反射片的设置方式类似，可使至少一个数字微镜器件20沿导光板10的远离出光面101一侧的平面(该平面即为与出光面101相对的平面)设置。
例如，数字微镜器件的多个微镜的反射面的面积总和与导光板的出光面的面积大致相等，这样，导光板的各个区域都有微镜对应，从而能够对各个区域的光进行控制。
例如，数字微镜器件的多个微镜的反射面平行于所述导光板的出光面的状态下，多个微镜中相邻微镜的反射面的边缘彼此接触，如图4a所示。
本领域技术人员应该明白，背光模组还可包括固定导光板10、数字微镜器件20等的背板、胶框等。
控制数字微镜器件20的控制板可以位于背光模组内，也可独立于背光模组设置。当数字微镜器件20的控制板独立于背光模组设置时，可通过连接线例如柔性线路板(FPC)等连接至背光模组外的控制板。
考虑到背光模组的轻薄化，本公开实施例中，可将数字微镜器件20的控制板独立于背光模组设置，当背光模组应用于显示装置时，可设置于显示装置的其他位置处。
本公开实施例提供一种背光模组，通过在导光板10的远离出光面101一侧设置至少一个数字微镜器件20，并通过控制数字微镜器件20中的微镜201，可使特定区域的微镜201进行转动，以使这些转动后的微镜201将光反射至某一区域，而该区域的亮度就会提高，从而实现区域亮度控制的目的。基于此，当该背光模组应用于显示装置时，可提高显示的动态范围，提高区 域对比度，实现高动态范围。
在一些示例中，在数字微镜器件20为多个的情况下，多个数字微镜器件20拼接在一起。
此处，多个数字微镜器件20拼接在一起，即，多个数字微镜器件20紧密排布且微镜201的反射面在同一平面上。
一方面，使得本公开的背光模组可适用于大尺寸显示装置，另一方面，多个数字微镜器件20拼接在一起，拼接后的数字微镜器件20可具有较好的区域亮度控制的性能。
在一些示例中，导光板10还用作数字微镜器件20中微镜201的保护板。
由于微镜201比较脆弱，数字微镜器件20通常采用在微镜201上方覆盖一整块高透过率、高硬度的玻璃作为保护板。本公开实施例中，由于微镜201设置在导光板10下方，因而，可将原有的保护板去掉，使导光板10起到兼具保护微镜201的作用。
由于微镜201需要转动，因此，如图5所示，需使导光板10与微镜201之间留出空隙，而在导光板10与数字微镜器件20的边缘可以使二者粘结在一起，并做抽真空处理。例如，如图5所示，数字微镜器件20的边缘部分可以通过密封部件202与导光板密封，而在数字微镜20的边缘部分的内侧与导光板之间形成一空隙。图5中仅仅示意性地画出了两个微镜201以图示方便，但数字微镜20可以包括更多个微镜。如图5所示，数字微镜器件20本身可以包括基板，微镜形成与基板上，从而使得该基板与导光板之间形成密封空间。然而，根据本公开的实施例不限于此，也可以通过其他基板来形成密封空间。
本公开实施例，通过使导光板10起到兼具保护微镜201的作用，可进一步的减小背光模组的厚度，更符合产品轻薄的设计。
在一些示例中，微镜201包括用于形成反射面的银反射层。
相对于铝反射层，采用银反射层可进一步提高反射率。
在一些示例中，如图6所示，所述背光模组还包括设置于导光板出光面101一侧的光学膜片30，以进行不同目的之光学改进。
进一步的，如图6所示，光学膜片30包括依次设置于导光板出光面101一侧的扩散片301、下棱镜片302和上棱镜片303。这样，可使背光模组出射 的光的均一性更好。
在一些示例中，所述背光模组还包括设置于导光板10侧面的发光二极管的光源102，如图2所示。图2中仅仅示意性地示出光源102位于导光板10的一个侧面，但根据本公开的实施例不限于此。例如，光源102为(Light Emitting Diode，简称LED)灯条。LED具有体积小，耗电量低，使用寿命长等优点。
本公开实施例还提供一种显示装置，包括上述的背光模组，还包括显示面板。例如，所述背光模组设置在所述显示面板的入光面一侧，从而背光模组可以为显示面板提供光源。例如，显示面板可以为需要背光光源的液晶显示面板，但根据本公开的实施例不限于此。利用上述背光模组的显示装置可提高显示装置显示的动态范围，提高区域对比度，实现高动态范围。
所述显示装置可以是电视、笔记本电脑、平板电脑，智能手机等。
本公开实施例还提供一种上述背光模组的控制方法，包括：通过控制数字微镜器件20中的微镜201，对背光模组进行区域亮度控制。其具有与上述背光模组相同的技术效果，在此不再赘述。
在一些示例中，当微镜201转动时，即转动β角度时，如图4b所示，可使导光板10透射出来的光向特定方向反射。基于此，通过控制数字微镜器件20中的微镜201，使特定区域的微镜201进行转动，以使这些转动后的微镜201将光反射至某一区域，而该区域的亮度就会提高，从而实现区域亮度控制的目的。在此情况下，可看作背光模组以区域亮度控制的模式进行工作。
可选的，对背光模组进行区域亮度控制，包括：将背光模组划分为多个背光分区，控制与预定的背光分区相邻的背光分区中的微镜201进行转动，以使光线反射至预定的背光分区。
即：将背光模组划分为多个区域，当需要控制某一个或几个背光分区亮度较高时，可控制与该背光分区相邻的背光分区中的微镜201进行转动，以使导光板10出射的且射向这些转动后的微镜201的光，经反射后能射向某一个或几个背光分区中，从而使该背光分区的亮度提高，而与该背光分区相邻的背光分区亮度则较低。
背光分区的划分需与显示面板的区域划分一致，以保证亮度较高的背光分区对应的是显示面板上亮度较高的区域。
在一些示例中，所述控制方法还包括：控制所有微镜201为平坦状态。
当微镜201处于平坦状态时，如图4a所示，例如α＝0°。当数字微镜器件20中所有微镜201都处于平坦状态时，数字微镜器件20将导光板10透射出来的光在整个导光板10区域内基本一致的反射回导光板10。在此情况下，数字微镜器件20的作用与普通的反射片作用相同，此时，可看作背光模组以普通模式进行工作。
基于此，可使背光模组具有两种工作模式，从而可使该背光模组的适用范围更广。
本公开的实施例提供的背光模组及其控制方法、显示装置，通过在导光板的远离出光面一侧设置至少一个数字微镜器件，并通过控制数字微镜器件中的微镜，可使特定区域的微镜进行转动，以使这些转动后的微镜将光反射至某一区域，而该区域的亮度就会提高，从而实现区域亮度控制的目的。基于此，当该背光模组应用于显示装置时，可提高显示的动态范围，提高区域对比度，实现高动态范围。
以上所述仅是本公开的示范性实施方式，而非用于限制本公开的保护范围，本公开的保护范围由所附的权利要求确定。

Claims (15)

  1. 一种背光模组，包括导光板，设置于导光板的远离出光面一侧的至少一个数字微镜器件，所述至少一个数字微镜器件包括多个微镜，且所述微镜的反射面面对所述导光板。
  2. 根据权利要求1所述的背光模组，其中，所述至少一个数字微镜器件的边缘部分与所述导光板连接，且所述至少一个数字微镜器件的边缘部分的内侧与所述导光板之间具有一空隙。
  3. 根据权利要求2所述的背光模组，其中，所述至少一个数字微镜器件的边缘部分与所述导光板密封连接，所述空隙被抽真空。
  4. 根据权利要求1-3任一项所述的背光模组，其中，所述至少一个数字微镜器件包括多个数字微镜器件，且所述多个数字微镜器件拼接在一起。
  5. 根据权利要求1-4任一项所述的背光模组，其中，所述数字微镜器件的多个微镜被配置为独立控制，以使所述微镜的反射面与所述导光板的出光面之间的夹角改变。
  6. 根据权利要求5所述的背光模组，其中，每个所述微镜被配置为可在其反射面平行于导光板的状态、以及相对于所述导光板朝彼此相反的两个方向偏斜的状态之间切换。
  7. 根据权利要求1-6任一项所述的背光模组，还包括光源，所述光源设置在所述导光板的侧面；或者所述光源设置在所述导光板的出光面的相反侧且在所述导光板与所述至少一个数字微镜器件之间。
  8. 根据权利要求1-7任一项所述的背光模组，其中，所述数字微镜器件的微镜包括用于形成反射面的银反射层。
  9. 根据权利要求1-8任一项所述的背光模组，其中，还包括设置于所述导光板出光面一侧的光学膜片。
  10. 根据权利要求9所述的背光模组，其中，所述光学膜片包括依次设置于所述导光板出光面一侧的扩散片、下棱镜片和上棱镜片。
  11. 根据权利要求1-10任一项所述的背光模组，其中，所述至少一个数字微镜器件的多个微镜的反射面的面积总和与所述导光板的出光面的面积大致相等。
  12. 根据权利要求1-11任一项所述的背光模组，其中，在所述至少一个数字微镜器件的多个微镜的反射面平行于所述导光板的出光面的状态下，所述多个微镜中相邻微镜的反射面的边缘彼此接触。
  13. 一种显示装置，包括权利要求1-12任一项所述的背光模组和显示面板，所述背光模组设置在所述显示面板的入光面一侧。
  14. 一种如权利要求1-12任一项所述背光模组的控制方法，包括：通过控制所述至少一个数字微镜器件中的多个微镜，对所述背光模组进行区域亮度控制。
  15. 根据权利要求14所述的控制方法，其中，对所述背光模组进行区域亮度控制，包括：
    将所述背光模组划分为多个背光分区，控制与所述多个背光分区中预定的背光分区相邻的背光分区中的所述微镜进行转动，以使从所述导光板出射至所述微镜的光线反射至所述预定的背光分区。
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