WO2016123918A1 - 背光模组、其制作方法、显示装置 - Google Patents

背光模组、其制作方法、显示装置 Download PDF

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Publication number
WO2016123918A1
WO2016123918A1 PCT/CN2015/084550 CN2015084550W WO2016123918A1 WO 2016123918 A1 WO2016123918 A1 WO 2016123918A1 CN 2015084550 W CN2015084550 W CN 2015084550W WO 2016123918 A1 WO2016123918 A1 WO 2016123918A1
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WO
WIPO (PCT)
Prior art keywords
power generating
electrode
backlight module
generating unit
light
Prior art date
Application number
PCT/CN2015/084550
Other languages
English (en)
French (fr)
Inventor
谭纪风
Original Assignee
京东方科技集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/907,713 priority Critical patent/US9874679B2/en
Publication of WO2016123918A1 publication Critical patent/WO2016123918A1/zh

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Classifications

    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S9/00—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/02—Arrangement of electric circuit elements in or on lighting devices the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
    • F21V23/023—Power supplies in a casing
    • 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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
    • H02N1/04—Friction generators

Definitions

  • Embodiments of the present invention relate to a backlight module, a method of fabricating the same, and a display device.
  • a television mainly provides an electrical signal through an external power source.
  • a mobile phone itself includes a battery for storing electric energy, but the battery must be charged by an external power source before use, and when the battery is exhausted, it must be charged by an external power source to continue use.
  • the related display device must rely on an external power supply device to realize the display, especially for a mobile display device such as a mobile phone, which brings problems such as inconvenient use.
  • An embodiment of the present invention provides a backlight module, including a light emitting unit and a power generating unit that supplies power to the light emitting unit.
  • the backlight module has a light emitting surface, and the power generating unit and the light emitting surface face each other.
  • the light emitted by the light-emitting unit enters between the at least one power generating unit and the light-emitting surface and emits the backlight module from the light-emitting surface, and the power generating unit is away from the light-emitting surface
  • a first electrode, a power generating layer, and a second electrode are included, the first electrode configured to reflect light from the light emitting unit.
  • the embodiment of the present invention provides a method for fabricating a backlight module, comprising: a light emitting unit and a power generating unit for supplying power to the light emitting unit; wherein the backlight module has a light emitting surface, and the power generating unit and the light emitting surface are mutually connected to each other Facing and spaced apart, the light emitted by the light-emitting unit enters between the power generating unit and the light-emitting surface, and the backlight module is emitted from the light-emitting surface, and the power generating unit is away from the light-emitting surface.
  • the upper electrode includes a first electrode, a power generation layer, and a second electrode, the first electrode configured to reflect light from the light emitting unit.
  • Embodiments of the present invention provide a display device including a display panel and the backlight module.
  • 1 is a schematic diagram of a related direct type backlight module
  • FIG. 2 is a schematic diagram of a related side-entry backlight module
  • FIG. 3 is a schematic diagram of a backlight module according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic diagram of another backlight module according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of another backlight module according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of a power generating unit according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of another power generating unit according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of another power generating unit according to an embodiment of the present invention.
  • Embodiments of the present invention provide a backlight module, a manufacturing method thereof, and a display device.
  • the backlight module includes a power generating unit that collects generated electric energy and applies it to display.
  • the reflective layer of the backlight module and the first electrode of the power generating unit may be the same film layer, which is also advantageous for integration and thinning of the backlight module.
  • the liquid crystal display does not emit light by itself, and is generally realized by a backlight module.
  • a backlight module provided by the embodiment of the present invention, the type and basic structure of the related backlight module are first introduced.
  • the backlight module is divided into a side-in backlight module and a direct-lit backlight module according to different positions of the light-emitting units in the LCD.
  • the light-emitting unit of the side-lit backlight module is disposed on the side of the LCD display, and the light-emitting unit of the direct-lit backlight module is disposed below the LCD display.
  • the direct type backlight module and the side-in type backlight module shown in FIG. 1 and 2 the light emitted by the light emitting unit converts the point light source or the line light source into a surface light source through the light guide plate to enter the LCD display screen.
  • FIG. 1 is a schematic structural diagram of a related direct type backlight module, including a plurality of light emitting units. 11.
  • the light guide plate 13 is not essential, that is, the direct type backlight module shown in FIG. 1 may not include the light guide plate 13.
  • FIG. 2 it is a schematic structural diagram of a related side-lit backlight module, including a plurality of light emitting units 11 , a reflective sheet 12 , a light guide plate 13 , and an optical film 14 .
  • the light emitting unit 11 is located on the side of the light guide plate 13 , and the light emitted by the light emitting unit 11 is reflected from the side surface and reflected by the reflective sheet 12 into the light guide plate 13 .
  • the optical film generally includes a diffusion sheet, a prism sheet, and the like.
  • the light emitted by the light-emitting unit is reflected by the reflective plate to the upper surface of the light guide plate, converted into planar light by the light guide plate, and then emitted by the diffusion plate and the diffusion and mixing of the prism sheet.
  • the backlight module in the embodiment of the present invention may be the above-mentioned direct type backlight module, or may be a side-in type backlight module, and the embodiment of the present invention and the drawings do not improve other structures of the backlight module, only Some of the structures related to the inventive aspects of the embodiments of the present invention are exemplified.
  • the embodiment of the present invention provides a backlight module, as shown in FIG. 3, including a power generating unit 11, a light guide plate 13, and at least one power generating unit 20.
  • the backlight module includes a power generating unit 20 as an example, and the power generating unit is used.
  • 20 includes a first electrode 21, a second electrode 22, and a power generation layer 23 between the first electrode 21 and the second electrode 22, wherein the first electrode 21 and the second electrode 22 are outputs of the power generating unit 20.
  • the power generating unit 20 is for supplying an electric signal to the light emitting unit 11. That is, the backlight module can drive the illumination unit to emit light without an external power supply.
  • the backlight module has a light emitting surface S, and the power generating unit 20 is disposed on a side of the light emitting surface S of the light guiding plate 13 , and the first electrode 21 of the at least one power generating unit is in direct contact with the light guiding plate 13 , wherein the first electrode 21 has a light reflecting property, and a side of the first electrode 21 facing the light guide plate is a reflecting surface.
  • the backlight module of FIG. 3 includes only one power generating unit 20, that is, the first electrode 21 of the power generating unit 20 is in direct contact with the light guide plate 13.
  • the backlight module may include a plurality of power generating units, and any one of the plurality of power generating units may be the power generating unit 20 as shown in FIG. 3, and the first electrode 21 is in direct contact with the light guide plate 13.
  • the first electrodes of each of the plurality of power generating units may be in direct contact with the light guide plate 13.
  • the power generating unit 20 may be a friction power generating unit.
  • the power generation layer may be a polymer insulation layer.
  • the principle of frictional power generation is that the first electrode is rubbed with the polymer insulating layer, and the polymer insulating layer forms an induced electric field with the first electrode and the second electrode, respectively, thereby generating a voltage or a current. At this time, the first electrode and the second electrode are respectively collected. Negative charge and positive charge, first electrode and second electrode as hair
  • the output of the electrical unit may be a positive and negative charge drawn through the wire to power the lighting unit or the display panel.
  • Embodiments of the present invention provide a backlight module including at least one power generating unit, which can be self-generated to be applied to a backlight module or a display device including the backlight module.
  • the first electrode of the power generating unit is in direct contact with the light guide plate. Since the first electrode is reflective, the side of the first electrode facing the light guide plate is a reflective surface, that is, the first electrode is used as a reflective layer of the light guide plate, that is, the power generation unit.
  • the first electrode and the reflective layer of the light guide plate are the same layer of film, and it is not necessary to form a reflective sheet on the light guide plate, which can not only reduce the manufacturing process steps, reduce the film material, reduce the production cost, but also facilitate the integration of the backlight module. Light and thin.
  • the first electrode of the power generating unit may be in direct contact with the light guide plate, and the first electrode 21 of the power generating unit 20 and the light guide plate 13 may be directly bonded to each other to form a backlight module as shown in FIG. 3 .
  • the direct contact of the first electrode with the light guide plate may be: the first electrode is deposited on the light guide plate. That is, the light guide plate is used as a base substrate of the power generating unit, and the first electrode, the power generation layer, and the second electrode are sequentially deposited on the light guide plate.
  • the first electrode is deposited on the light guide plate, the first electrode and the light guide plate are not easily detached, and the power generating device is integrated with the light guide plate.
  • the light guide plate may be glass, polymethyl methacrylate (PMMA, Polymethyl Methacrylate), polyimide (PI, Polyimide), or the like.
  • the first electrode has a light reflectivity, and the first electrode may be a metal electrode or other electrode having a reflective property.
  • the first electrode is a metal electrode such as Al, Ag or Cu as an example for detailed description.
  • the power generating unit further includes a protective layer, and the first electrode and the second electrode are covered by the protective layer on the side facing the power generating layer.
  • the material forming the protective layer may be Mo or ITO (Indium tin oxide).
  • the first electrode and the second electrode are covered by the protective layer, and the first electrode and the second electrode may be directly coated and deposited on the protective layer without exposure.
  • the reflective sheet in the related backlight module is generally a polymer material layer having a separate reflection function
  • the first electrode is used as a reflective layer of the light guide plate, that is, the power generation unit
  • the one electrode and the reflective layer of the light guide plate are the same layer of the film, and it is not necessary to form a reflective layer on the light guide plate, so that the power generation unit and the backlight module are integrated, light and thin.
  • a surface of the first electrode facing the light-emitting layer, a surface of the second electrode facing the light-emitting layer, At least one of the surface of the light-emitting layer facing the first electrode side and the surface of the light-emitting layer facing the second electrode has an uneven structure.
  • the surface of the first electrode 21 and the second electrode 22 on the side facing the power generation layer 23 is an uneven structure.
  • 7 shows that the surface of the first electrode 21 and the second electrode 22 facing the power generation layer 23 has a concave-convex structure, and the surface of the power generation layer facing the first electrode side and the surface of the power generation layer facing the second electrode are both uneven structures.
  • the concave-convex structure in FIG. 6 and FIG. 7 includes a triangular structure, and of course, any other irregular concave-convex structure, etc., which is not specifically limited in the embodiment of the present invention.
  • At least one surface is a concave-convex structure, which increases the relative surface area of the first electrode 21, the second electrode 22 and the power generation layer 23, thereby enabling the first electrode and the second electrode to contact the power generation layer better. More charge is induced at the first electrode and the second electrode.
  • an elastic member is disposed between the first electrode 21 and the second electrode 22.
  • the elastic member can be used not only as the elastic support of the first electrode 21 and the second electrode 22, so that a squeeze-separated vibration state is generated between the first electrode, the second electrode and the power generation layer to form a voltage pulse, and when an external force acts on the first An electrode, the first electrode is compressed by the extrusion spring, and the power generation layer forms a friction interface with the first electrode; when the external force disappears, the spring returns to elastic deformation, the first electrode is separated from the power generation layer, and the friction power generation unit quickly returns to the original state. It can also act as a buffer when the display is impacted by an external force to further enhance the drop resistance of the display including the backlight module of the embodiment of the present invention.
  • the elastic member 24 is located at the edge position of the first electrode 21 and the second electrode 22, so that the contact friction between the first electrode and the second electrode and the power generation layer is not affected.
  • the elastic member is a resin material or a rubber material.
  • the elastic member in the embodiment of the present invention may be an elastic resin material such as a PR glue.
  • the composition and mass fraction of the PR glue can be: solvent (ether, ester, etc.) accounted for 90%, monomer (Acrylates) and polymers accounted for 7%, dispersants accounted for 2%, and initiators accounted for 1%. It should be noted that the mass fraction of the components of the above-mentioned PR glue can also be adjusted as needed, and the embodiment of the present invention is described by way of example only.
  • the elastic material is made of high-elastic PR glue, and the content of the monomer can be adjusted to improve the elastic modulus of the elastic member, so that the elastic member can be pressed down by 10-15%, and the rebound amount is greater than 95%.
  • a particulate matter is doped in the resin material, wherein the particle diameter of the particulate matter is not more than 100 ⁇ m.
  • the high-elasticity PR glue is doped with acrylic particles or inorganic filler particles to further increase the toughness of the PR glue, so that the elastic member undergoes shear yielding under pressure, absorbs a large amount of plastic deformation energy, and promotes brittle-ductile transformation of the elastic member. .
  • the inorganic filler particles may be CaCO 3 having a particle diameter of 1 to 11 ⁇ m, or an ultrafine ceramic having a particle diameter of 0.09 ⁇ m, or a silicon sphere having a particle diameter of 3 to 10 ⁇ m and any combination thereof.
  • the rubber material may be, for example, polystyrene, polybutadiene or polyisoprene or the like.
  • the backlight module includes a plurality of power generating units, and at least two power generating units 20 are stacked.
  • the backlight module includes three power generating units, that is, a first power generating unit, a second power generating unit, and a third power generating unit, wherein the first electrode of the first power generating unit and the second power generating unit and the light guide plate Direct contact, and a third power generating unit is additionally stacked on the first power generating unit or the second power generating unit.
  • the backlight module includes two power generating units as an example, and two power generating units are stacked, and the first electrode 21 of one power generating unit 20 is in direct contact with the light guide plate 13.
  • a weight layer 15 is formed between two adjacent power generating units 20 stacked.
  • the weight layer may be an insulating layer depending on the use of the power generating unit.
  • the output ends of the first electrode and the second electrode of the two power generating units may be electrically connected by external components to realize series or parallel connection of the two power generating units.
  • the weight layer is an insulating layer, which not only can reduce the electrostatic adsorption force between the two electrodes after collecting the electric charge, avoiding the power generation effect, and can also enhance the friction effect between the electrodes on both sides of the weight layer and the power generation layer.
  • the second electrode of one power generating unit When there is no weight layer, the second electrode of one power generating unit is directly in electrical contact with the first electrode of the other power generating unit, and the thicknesses of the first electrode and the second electrode are adjusted, and the shared electrode serves as a weight.
  • the role of the layer at the same time to achieve the series connection of two power generation units.
  • the backlight module provided by the embodiment of the present invention may further include: a voltage stabilizing circuit 16 electrically connected to the power generating unit 20, and the power generating unit 20 inputs an electrical signal to the voltage stabilizing circuit 16. Since the electrical signal output by the power generating unit 20 is generally a pulse signal, a stable electrical signal can be output through the voltage stabilizing circuit 16.
  • the backlight module provided by the embodiment of the present invention further includes: an electrical energy storage device 17 electrically connected to the power generating unit 20, configured to store the electrical energy output by the power generating unit 20, so as to be required to the backlight module.
  • the display panel provides an electrical signal.
  • the electrical signal output by the power generating unit 20 may be stored in the power storage unit 17 after being passed through the voltage stabilizing circuit 16.
  • Embodiments of the present invention provide a method for fabricating a backlight module, including:
  • Step 101 Providing a light guide plate.
  • Each optical film or the like can be formed on the light guide plate.
  • the embodiment of the present invention is described by using only the light guide plate associated with the power generating unit.
  • Other structures of the backlight module can be made by referring to the related art, which is not specifically described in the embodiment of the present invention.
  • Step 102 Providing at least one power generating unit, wherein the power generating unit includes: forming a first electrode, a second electrode, and a power generating layer between the first electrode and the second electrode; wherein the first electrode of the power generating unit is directly connected to the light guide plate In contact, the first electrode is reflective and serves as a reflective layer of the light guide plate.
  • the method comprises: depositing a conductive film on the light guide plate to form a first electrode.
  • the light guide plate may be glass, PMMA, PI, or the like.
  • a metal layer having a high reflectance such as Al, Ag or Cu may be deposited on the light guide plate, and the thickness is generally 1000-4000 angstroms.
  • the backlight module formed by the above method has a small thickness, a small number of films, and can well integrate the light guide plate and the power generating unit, and the first electrode is deposited on the light guide plate, and the first electrode and the light guide plate are not easily peeled off.
  • the power generation device is integrated with the light guide plate.
  • the first electrode 21 of the power generating unit 20 may be brought into direct contact with the light guide plate 13 to form the power generating unit 20, and the first electrode 21 of the power generating unit 20 and the light guide plate 13 may be directly bonded.
  • This method of formation is simple and easy to implement.
  • a protective layer is formed on a side of the first electrode and the second electrode close to the power generation layer.
  • the material forming the protective layer may be Mo or ITO.
  • the first electrode and the second electrode are covered by the protective layer, which may be directly coated and deposited on the protective layer to cover the first electrode and the second electrode without exposure, and protection The layer prevents the metal electrode from being eroded by water oxygen in the air.
  • the backlight module includes at least two power generating units, and forming at least two power generating units includes, for example:
  • Step 201 Form a power generating unit.
  • Step 202 forming a weight layer on the power generating unit.
  • the weight layer may be an insulating layer depending on the use of the power generating unit.
  • the output ends of the first electrode and the second electrode of the two power generating units may be electrically connected by external components to realize series or parallel connection of the two power generating units.
  • the weight layer is an insulating layer, which not only can reduce the electrostatic adsorption force between the two electrodes after collecting the electric charge, avoiding the power generation effect, and can also enhance the friction effect between the electrodes on both sides of the weight layer and the power generation layer.
  • the second electrode of one power generating unit When there is no weight layer, the second electrode of one power generating unit is directly in electrical contact with the first electrode of the other power generating unit, and the thickness of the first electrode and the second electrode is adjusted, and the shared electrode functions as a weight layer. At the same time, the series connection of two power generating units is realized.
  • Step 203 forming another power generating unit on the weight layer.
  • the above steps 202 and 203 may be repeatedly performed to form two or more power generating units.
  • forming three power generating units includes:
  • Step 021 forming a first power generating unit.
  • Step 022 forming a weight layer on the first power generating unit.
  • Step 023 forming a second power generating unit on the weight layer.
  • Step 024 forming a weight layer on the second power generating unit.
  • Step 025 forming a third power generating unit on the weight layer.
  • step of forming the power generating unit may refer to the description of step 102 above, and details are not described herein.
  • the embodiment of the present invention provides a display device, including the backlight module and the display panel provided by any embodiment of the present invention.
  • the display device is a liquid crystal display device.
  • the display panel is a liquid crystal display panel.
  • the TFT array substrate and the opposite substrate are opposed to each other to form a liquid crystal cell, and the liquid crystal cell is filled with a liquid crystal material.
  • the opposite substrate is, for example, a color filter substrate.
  • the pixel electrode of each pixel unit of the TFT array substrate is used to apply an electric field to control the degree of rotation of the liquid crystal material System to perform display operations.
  • the power generating unit in the backlight module provided by the embodiment of the present invention can also provide an electrical signal to the display panel.
  • a backlight module comprising: a light emitting unit and a power generating unit for supplying power to the light emitting unit; wherein the backlight module has a light emitting surface, and the power generating unit and the light emitting surface face each other and are spaced apart
  • the light emitted by the light-emitting unit enters between the power generating unit and the light-emitting surface and emits the backlight module from the light-emitting surface
  • the power generating unit includes a first electrode in a direction away from the light-emitting surface And a power generating layer and a second electrode, the first electrode configured to reflect light from the light emitting unit.
  • the backlight module of (1) further comprising a light guide plate between the power generating unit and the light emitting surface, and the first electrode of the power generating unit is in direct contact with the light guide plate.
  • the backlight module according to any one of (1) to (3) wherein the power generating unit is a friction power generating unit, and the power generating layer is a polymer insulating layer.
  • the backlight module according to any one of (1) to (5), wherein the first electrode faces the side of the light-emitting layer, the surface of the second electrode faces the light-emitting layer, and emits light. At least one of the surface of the layer facing the first electrode side and the surface of the light emitting layer facing the second electrode has an uneven structure.
  • the backlight module according to any one of (1) to (6), wherein an elastic member is disposed between the first electrode and the second electrode.
  • the backlight module according to any one of (1) to (7), wherein the backlight module includes a plurality of the power generating units, wherein at least two of the power generating units are stacked.
  • the backlight module according to any one of (1) to (9) wherein the first electrode is a metal electrode.
  • the backlight module according to any one of (1) to (12) further comprising: a voltage stabilizing circuit electrically connected to the power generating unit, wherein the voltage stabilizing circuit powers the power generating unit The signal is regulated.
  • the power generating unit includes a first electrode, a power generating layer and a second electrode in a direction away from the light emitting surface, wherein the first electrode is configured to reflect from the Light from the lighting unit.
  • Another power generating unit is disposed on the weight layer.
  • a display device comprising a display panel and the backlight module according to any one of (1) to (14).

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  • Optics & Photonics (AREA)
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  • Manufacturing & Machinery (AREA)
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Abstract

一种背光模组及其制作方法、显示装置。背光模组包括发光单元(11)和对发光单元(11)供电的发电单元(20)。背光模组具有一出光面(S)，发电单元(20)与出光面(S)彼此面对且间隔开，发光单元(11)发出的光线进入发电单元(20)与出光面(S)之间并从出光面(S)射出背光模组，发电单元(20)在远离出光面的方向上包括第一电极(21)、发电层(23)和第二电极(22)，第一电极(21)构造为反射来自发光单元(20)的光线。背光模组中的发电单元(20)的第一电极(21)可用作反射层，有利于背光模组的一体化和轻薄化。

Description

背光模组、其制作方法、显示装置 技术领域
本发明的实施例涉及背光模组、其制作方法、显示装置。
背景技术
相关的显示装置，均是通过外接电源装置提供电能。例如电视，其主要通过外接电源提供电信号。再例如手机，其本身虽然包括用来储存电能的电池，但使用之前必须通过外接电源向电池充电，且当电池电量用尽，又必须通过外接电源充电才能继续使用。
由此可见，相关的显示装置必须依赖外接的电源装置才能实现显示，尤其对于手机等移动显示装置，这样带来使用不方便等问题。
发明内容
本发明实施例提供了一种背光模组，包括发光单元和对该发光单元供电的发电单元；其中，所述背光模组具有一出光面，所述发电单元与所述出光面彼此面对且间隔开，所述发光单元发出的光线进入所述至少一个发电单元与所述出光面之间并从所述出光面射出所述背光模组，所述发电单元在远离所述出光面的方向上包括第一电极、发电层和第二电极，所述第一电极构造为反射来自所述发光单元的光线。
本发明实施例提供了一种背光模组的制作方法，包括发光单元和对该发光单元供电的发电单元；其中，所述背光模组具有一出光面，所述发电单元与所述出光面彼此面对且间隔开，所述发光单元发出的光线进入所述发电单元与所述出光面之间并从所述出光面射出所述背光模组，所述发电单元在远离所述出光面的方向上包括第一电极、发电层和第二电极，所述第一电极构造为反射来自所述发光单元的光线。
本发明实施例提供了一种显示装置，包括显示面板和上述背光模组。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例或相关技术描述中所需要使用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发明的一些实施例，并非对本发明的限制。
图1为相关的直下式背光模组示意图；
图2为相关的侧入式背光模组示意图；
图3为本发明实施例提供的一种背光模组示意图；
图4为本发明实施例提供的另一种背光模组示意图；
图5为本发明实施例提供的另一种背光模组示意图；
图6为本发明实施例提供的一种发电单元示意图；
图7为本发明实施例提供的另一种发电单元示意图；
图8为本发明实施例提供的另一种发电单元示意图。
具体实施方式
下面将结合附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明的实施例提供一种背光模组及其制作方法、显示装置，所述背光模组包括发电单元，可收集产生的电能并将其应用于显示。所述背光模组的反射层与发电单元的第一电极可以为同一层膜层，还有利于背光模组的一体化和轻薄化。
液晶显示器其自身不发光，一般通过背光模组来实现显示。为了更清楚的理解本发明实施例提供的背光模组，首先介绍相关的背光模组的种类以及基本结构。
相关技术中，根据发光单元在LCD中分布位置的不同，将背光模组分为侧入式背光模组和直下式背光模组两种。其中，侧入式背光模组的发光单元置于LCD显示屏的侧方，直下式背光模组的发光单元置于LCD显示屏的下方。对于图1和2所示的直下式背光模组和侧入式背光模组，发光单元发出的光经由导光板将点光源或线光源转换为面光源进入LCD显示屏。
如图1所示，为相关的直下式背光模组结构示意图，包括多个发光单元 11、反射片12、导光板13以及光学膜片14。发光单元11发出的部分光直接进入导光板13，部分光经反射片12反射进入导光板13。这里，导光板13不是必须的，也就是，图1所示的直下式背光模组也可以不包括导光板13。
如图2所示，为相关的侧入式背光模组结构示意图，包括多个发光单元11、反射片12、导光板13以及光学膜片14。其中，发光单元11位于导光板13的侧面，发光单元11发出的光从侧面并经反射片12反射进入导光板13。
其中，光学膜片一般包括扩散片和棱镜片等。发光单元发出的光经反射板反射至导光板的上表面，经导光板转换成平面光，再经过扩散板以及棱镜片的扩散和混合后发射出去。
本发明实施例中的背光模组可以是上述的直下式背光模组，也可是侧入式背光模组，且本发明实施例及附图对背光模组的其他结构不作改进的情况下，仅示例与本发明实施例的发明点相关的部分结构。
本发明实施例提供了一种背光模组，如图3所示，包括发电单元11、导光板13和至少一个发电单元20，图1中以背光模组包括一个发电单元20为例，发电单元20包括第一电极21、第二电极22以及位于第一电极21和第二电极22之间的发电层23，其中，第一电极21和第二电极22为发电单元20的输出端。发电单元20用于向发光单元11提供电信号。即背光模组无需外接电源，就可以驱动发光单元发光。
背光模组具有一出光面S，发电单元20设置在导光板13的原理所述出光面S的一侧，且至少一个发电单元的第一电极21与导光板13直接接触，其中，第一电极21具有反光性，第一电极21朝向导光板的一侧为反射面。图3中背光模组仅包括一个发电单元20，即发电单元20的第一电极21与导光板13直接接触。在另一实施例中，背光模组可包括多个发电单元，多个发电单元中的任意一个发电单元可以如图3所示的发电单元20，其第一电极21与导光板13直接接触。或者，多个发电单元的每一个的第一电极可以是都与导光板13直接接触。
本发明实施例中，发电单元20可以为摩擦发电单元。所述发电层可以为高分子绝缘层。摩擦发电的原理是第一电极与高分子绝缘层摩擦，高分子绝缘层与第一电极和第二电极分别形成感应电场，从而产生电压或电流，此时，第一电极和第二电极分别收集负电荷和正电荷，第一电极和第二电极作为发 电单元的输出端，可以是通过导线将正电荷和负电荷引出，以对发光单元或显示面板供电。
本发明实施例提供了一种背光模组，包括至少一个发电单元，所述发电单元可以自发电，以应用于背光模组或包括该背光模组的显示装置。其中，一个发电单元的第一电极与导光板直接接触，由于第一电极具有反光性，第一电极朝向导光板的一侧为反射面即将第一电极用作导光板的反射层，即发电单元的第一电极与导光板的反射层为同一层膜材，不必在导光板另形成反射片，不仅可以减少制造工艺步骤、减少膜材、降低生产成本，还有利于背光模组的一体化和轻薄化。
本发明的一个实施例中，发电单元的第一电极与导光板直接接触可以是，将发电单元20的第一电极21与导光板13直接贴合，形成如图3所示的背光模组。在另一个实施例中，第一电极与导光板直接接触可以是：第一电极沉积在导光板上。即将导光板用作发电单元的衬底基板，在导光板上依次沉积第一电极、发电层以及第二电极。这样第一电极沉积在导光板上，第一电极与导光板不易脱落，发电装置与导光板一体化。
例如，导光板可以是玻璃、聚甲基丙烯酸甲酯(PMMA，Polymethyl Methacrylate)、聚酰亚胺(PI，Polyimide)等。
本发明实施例中，第一电极具有反光性，第一电极可以为金属电极，或其他具有反光特性的电极。本发明实施例以第一电极为Al、Ag、Cu等金属电极为例进行详细说明。
为了防止金属电极被空气中的水氧侵蚀，例如，发电单元还包括保护层，第一电极和第二电极在朝向发电层的一侧被保护层覆盖。
例如，形成保护层的材料可以是Mo或ITO(Indium tin oxide，氧化铟锡)。且第一电极和第二电极被保护层覆盖可以是在保护层直接涂覆沉积覆盖第一电极和第二电极，而无需曝光。
这里需要说明的是，相关的背光模组中的反射片一般是具有单独的反射作用的高分子材料膜层，而本申请中，采用第一电极作为导光板的反射层，即发电单元的第一电极与导光板的反射层为同一层膜材，不必在导光板另形成反射层，使得发电单元与背光模组的一体化、轻薄化。
例如，第一电极朝向发光层一侧的面、第二电极朝向发光层一侧的面、 发光层朝向第一电极一侧的面以及发光层朝向第二电极一侧的面中，至少一个面具有凹凸结构。
如图6所示，以第一电极21和第二电极22均在朝向发电层23一侧的面为凹凸结构为例。图7所示为第一电极21和第二电极22朝向发电层23一侧的面为凹凸结构，且发电层朝向第一电极一侧的面以及发电层朝向第二电极的面均为凹凸结构。需要说明的是，图6、图7中的凹凸结构包括三角形结构，当然还可以是其他任意不规则的凹凸结构等，本发明实施例不作具体限定。
第一电极21朝向发光层23一侧的面、第二电极22朝向发光层23一侧的面、发光层23朝向第一电极21一侧的面以及发光层23朝向第二电极22一侧的面中，至少一个面为凹凸结构，增大了第一电极21、第二电极22与发电层23的相对表面积，进而能够使得第一电极、第二电极与发电层更好地接触摩擦，在第一电极和第二电极处感应出较多的电荷。
例如，如图8所示，第一电极21和第二电极22之间设置有弹性件。弹性件不仅可以用作第一电极21和第二电极22的弹性支承，使得第一电极、第二电极和发电层之间产生挤压-分离的振动状态而形成电压脉冲，当外力作用于第一电极，第一电极受挤压弹簧被压缩，发电层与第一电极形成摩擦界面；当外力消失时，弹簧恢复弹性形变，第一电极与发电层分离，摩擦发电单元迅速恢复原来的状态。还可以在显示器受外力冲击时，起到缓冲作用，以进一步增强包括本发明实施例背光模组的显示器的抗摔性能。
当然也可以借助外部其他的作用力使得第一电极、第二电极和发电层之间产生挤压-分离的振动状态而形成电压脉冲，本发明实施例不作具体限定。
例如，如图8所示，弹性件24位于第一电极21和第二电极22的边缘位置，这样不影响第一电极和第二电极与发电层的接触摩擦。
可选的，弹性件为树脂材料或橡胶材料。
现有的弹簧制造工艺复杂而粗糙，很难应用于高精密的显示面板上，要实现发电单元与手表、手机、显示器等面板结构相结合，必须要开发出能与面板产线制造技术相结合的弹性件制造工艺。因此，为了达到面板产线的技术嫁接，本发明实施例中的弹性件可以采用弹性树脂材料，例如PR胶。其中，PR胶的成分和质量分数可以是：溶剂(醚类，酯类等)占90％，单体 (丙烯酸酯类)和聚合物占7％，分散剂占2％，引发剂占1％。需要说明的是，上述PR胶的成分中的质量分数还可以根据需要做调整，本发明实施例仅以上述为例进行说明。
本发明实施例中的弹性件材料选用高弹性的PR胶，可以调整单体的含量等方法，提高弹性件的弹性系数，使得弹性件的下压量能达10-15％，回弹量大于95％。
为了增大树脂材料的弹性系数，本发明实施例中，例如在树脂材料中掺杂颗粒物，其中颗粒物的粒径不大于100μm。例如，在高弹性PR胶中掺杂亚克力颗粒或无机填料颗粒以进一步增加PR胶的韧性，使得弹性件在受压力时发生剪切屈服，吸收大量塑性形变能，促进弹性件的脆-韧转变。例如，无机填料颗粒可以是粒径为1-11um的CaCO3，或粒径是0.09um的超细陶瓷，或粒径是3-10um的硅球及其的任意组合。
例如，在弹性件为橡胶材料的情况下，橡胶材料例如可以是聚苯乙烯、聚丁二烯或聚异戊二烯等。
例如，背光模组包括多个发电单元，其中至少两个发电单元20层叠设置。在本发明的一个实施例中，背光模组包括三个发电单元即第一发电单元、第二发电单元以及第三发电单元，其中第一发电单元和第二发电单元的第一电极与导光板直接接触，且在其中第一发电单元或第二发电单元上另外层叠设置第三发电单元。
在图4的本发明实施例中，以背光模组包括两个发电单元为例，两个发电单元层叠设置，其中一个发电单元20的第一电极21与导光板13直接接触。例如，相邻的两个层叠设置的发电单元20之间形成有配重层15。
这里需要说明的是，根据发电单元的用途的不同，配重层可以是绝缘层。两个发电单元的第一电极和第二电极的输出端可以通过外界构件电连接，实现两个发电单元的串联或并联。
配重层为绝缘层，不仅可以减小两侧电极在收集电荷之后彼此之间产生静电吸附力，避免减弱发电效果，还可以增强配重层两侧的电极与发电层之间的摩擦效果。
当没有配重层时，一个发电单元的第二电极与另一个发电单元的第一电极直接接触电连接，调节第一电极和第二电极的厚度，共用的电极起到配重 层的作用，同时实现两个发电单元的串联。
如图5所示，本发明实施例提供的背光模组还可包括：与发电单元20电连接的稳压电路16，发电单元20向稳压电路16输入电信号。由于发电单元20输出的电信号一般为脉冲信号，通过稳压电路16可以输出稳定的电信号。
进一步的，如图5所示，本发明实施例提供的背光模组还包括：与发电单元20电连接的电能存储装置17，用于存储发电单元20输出的电能，以便需要时向背光模组或显示面板提供电信号。其中，如图6所示，发电单元20输出的电信号可以是先经过稳压电路16之后，在输入给存储发电单元17进行电能的存储。
本发明实施例提供了一种背光模组的制作方法，包括：
步骤101、提供导光板。
导光板上可形成有各光学膜片等。本发明实施例仅以与发电单元相关的导光板进行说明，背光模组其他结构可以参照相关技术制作，本发明实施例不作具体说明。
步骤102、提供至少一个发电单元，其中，发电单元包括：形成第一电极、第二电极以及位于第一电极和第二电极之间的发电层；其中，发电单元的第一电极与导光板直接接触，第一电极具有反光性，用作导光板的反射层。
例如，上述步骤102中，包括：在导光板上沉积导电薄膜，形成第一电极。例如，导光板可以是玻璃、PMMA、PI等。在导光板上可以蒸镀一层Al、Ag、Cu等反射率较高的金属层，厚度一般为1000-4000埃。
通过上述方式形成的背光模组厚度小，用的膜材数量少，能很好地使导光板与发电单元结合在一起，第一电极沉积在导光板上，第一电极与导光板不易脱落，发电装置与导光板一体化。
或者，使得发电单元20的第一电极21与导光板13直接接触的可以是，形成发电单元20，并将发电单元20的第一电极21与导光板13直接贴合。这种形成方式工艺简单，很容易实现。
例如，在第一电极和第二电极靠近发电层的一侧形成保护层。例如，形成保护层的材料可以是Mo或ITO。且第一电极和第二电极被保护层覆盖可以是在保护层直接涂覆沉积覆盖第一电极和第二电极，而无需曝光，且保护 层可以防止金属电极被空气中的水氧侵蚀。
例如，背光模组包括至少两个发电单元，形成至少两个发电单元例如包括：
步骤201、形成一个发电单元。
步骤202、在发电单元上形成配重层。
这里需要说明的是，根据发电单元的用途的不同，配重层可以是绝缘层。两个发电单元的第一电极和第二电极的输出端可以通过外界构件电连接，实现两个发电单元的串联或并联。
配重层为绝缘层，不仅可以减小两侧电极在收集电荷之后彼此之间产生静电吸附力，避免减弱发电效果，还可以增强配重层两侧的电极与发电层之间的摩擦效果。
当没有配重层时，一个发电单元的第二电极与另一个发电单元的第一电极直接接触电连接，调节第一电极和第二电极的厚度，共用的电极起到配重层的作用，同时实现两个发电单元的串联。
步骤203、在配重层上形成另一个发电单元。
可以重复执行上述步骤202和步骤203，以形成两个以上的发电单元。
下面以背光模组包括三个发电单元为例，形成三个发电单元包括：
步骤021、形成第一发电单元。
步骤022、在第一发电单元上形成配重层。
步骤023、在配重层上形成第二发电单元。
步骤024、在第二发电单元上形成配重层。
步骤025、在配重层上形成第三发电单元。
例如，形成发电单元的步骤可以参照上述步骤102的描述，这里不作赘述。
本发明实施例提供了一种显示装置，包括本发明任一实施例提供的所述的背光模组和显示面板。
该显示装置的一个示例为液晶显示装置。对应的，该显示面板为液晶显示面板。在液晶显示面板中，TFT阵列基板与对置基板彼此对置以形成液晶盒，在液晶盒中填充有液晶材料。该对置基板例如为彩膜基板。TFT阵列基板的每个像素单元的像素电极用于施加电场对液晶材料的旋转的程度进行控 制从而进行显示操作。
例如，本发明实施例提供的背光模组中的发电单元还可以向显示面板提供电信号。
根据上述描述，根据本发明的实施例至少可以提供以下结构和方法：
(1)、一种背光模组，包括发光单元和对该发光单元供电的发电单元；其中，所述背光模组具有一出光面，所述发电单元与所述出光面彼此面对且间隔开，所述发光单元发出的光线进入所述发电单元与所述出光面之间并从所述出光面射出所述背光模组，所述发电单元在远离所述出光面的方向上包括第一电极、发电层和第二电极，所述第一电极构造为反射来自所述发光单元的光线。
(2)、根据(1)所述的背光模组，还包括位于所述发电单元与所述出光面之间的导光板，且所述发电单元的第一电极与所述导光板直接接触。
(3)、根据(2)所述的背光模组，其中，所述第一电极直接沉积在所述导光板上。
(4)、根据(1)至(3)中任一项所述的背光模组，其中，所述发电单元为摩擦发电单元，所述发电层为高分子绝缘层。
(5)、根据(4)所述的背光模组，其中，所述发电层为高分子绝缘层。
(6)、根据(1)至(5)中任一项所述的背光模组，其中，所述第一电极朝向发光层一侧的面、第二电极朝向发光层一侧的面、发光层朝向第一电极一侧的面以及发光层朝向第二电极一侧的面中，至少一个面具有凹凸结构。
(7)、根据(1)至(6)中任一项所述的背光模组，其中，所述第一电极和所述第二电极之间设置有弹性件。
(8)、根据(1)至(7)中任一项所述的背光模组，其中，所述背光模组包括多个所述发电单元，其中至少两个所述发电单元为层叠设置。
(9)、根据权利要求(8)所述的背光模组，其中，相邻的两个层叠设置的发电单元之间形成有配重层。
(10)、根据(1)至(9)中任一项所述的背光模组，其中，所述第一电极为金属电极。
(11)、根据(1)至(10)中任一项所述的背光模组，其中，所述发电单元还包括保护层，所述第一电极和所述第二电极在朝向所述发电层的一侧 被所述保护层覆盖。
(12)、根据权利要求7所述的背光模组，其中，所述弹性件为树脂材料或橡胶材料。
(13)、根据(1)至(12)中任一项所述的背光模组，其中，还包括：与所述发电单元电连接的稳压电路，所述稳压电路对发电单元的电信号进行稳压处理。
(14)、根据(1)至(13)中任一项所述的背光模组，其中，还包括：与所述发电单元电连接的电能存储装置，用于存储发电单元输出的电能。
(15)、一种背光模组的制作方法，该背光模组具有一出光面，该方法包括以下步骤：
提供发光单元；以及
提供发电单元以对所述发光单元供电，其中，所述发电单元与所述出光面彼此面对且间隔开，使得所述发光单元发出的光线进入所述至少一个发电单元与所述出光面之间并从所述出光面射出所述背光模组，所述发电单元在远离所述出光面的方向上包括第一电极、发电层和第二电极，所述第一电极构造为反射来自所述发光单元的光线。
(16)、根据(15)所述的制作方法，还包括提供位于所述发电单元与所述出光面之间的导光板，其中提供发电单元的步骤包括：在所述导光板上沉积导电薄膜作为所述第一电极。
(17)、根据(15)或(16)所述的制作方法，其中，提供发电单元的步骤包括：
提供一个发电单元；
在所述发电单元上设置配重层；
在所述配重层上设置另一个发电单元。
(18)、一种显示装置，包括显示面板以及(1)至(14)中任一项所述的背光模组。
虽然上文中已经用一般性说明及具体实施方式，对本发明实施例作了详尽的描述，但在本发明实施例基础上，可以对之作一些修改或改进，这对本领域技术人员而言是显而易见的。因此，在不偏离本发明实施例精神的基础上所做的这些修改或改进，均属于本发明实施例要求保护的范围。
本申请要求于2015年2月2日递交的中国专利申请第201510053936.5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。

Claims (18)

  1. 一种背光模组，包括发光单元和对该发光单元供电的发电单元；其中，所述背光模组具有一出光面，所述发电单元与所述出光面彼此面对且间隔开，所述发光单元发出的光线进入所述发电单元与所述出光面之间并从所述出光面射出所述背光模组，所述发电单元在远离所述出光面的方向上包括第一电极、发电层和第二电极，所述第一电极构造为反射来自所述发光单元的光线。
  2. 根据权利要求1所述的背光模组，还包括位于所述发电单元与所述出光面之间的导光板，且所述发电单元的第一电极与所述导光板直接接触。
  3. 根据权利要求2所述的背光模组，其中，所述第一电极直接沉积在所述导光板上。
  4. 根据权利要求1至3中任一项所述的背光模组，其中，所述发电单元为摩擦发电单元，所述发电层为高分子绝缘层。
  5. 根据权利要求4所述的背光模组，其中，所述发电层为高分子绝缘层。
  6. 根据权利要求1至5中任一项所述的背光模组，其中，所述第一电极朝向发光层一侧的面、第二电极朝向发光层一侧的面、发光层朝向第一电极一侧的面以及发光层朝向第二电极一侧的面中，至少一个面具有凹凸结构。
  7. 根据权利要求1至6中任一项所述的背光模组，其中，所述第一电极和所述第二电极之间设置有弹性件。
  8. 根据权利要求1至7中任一项所述的背光模组，其中，所述背光模组包括多个所述发电单元，其中至少两个所述发电单元为层叠设置。
  9. 根据权利要求8所述的背光模组，其中，相邻的两个层叠设置的发电单元之间形成有配重层。
  10. 根据权利要求1至9中任一项所述的背光模组，其中，所述第一电极为金属电极。
  11. 根据权利要求1至10中任一项所述的背光模组，其中，所述发电单元还包括保护层，所述第一电极和所述第二电极在朝向所述发电层的一侧被所述保护层覆盖。
  12. 根据权利要求7所述的背光模组，其中，所述弹性件为树脂材料或橡胶材料。
  13. 根据权利要求1至12中任一项所述的背光模组，其中，还包括：与所述发电单元电连接的稳压电路，所述稳压电路对发电单元的电信号进行稳压处理。
  14. 根据权利要求1至13中任一项所述的背光模组，其中，还包括：与所述发电单元电连接的电能存储装置，用于存储发电单元输出的电能。
  15. 一种背光模组的制作方法，该背光模组具有一出光面，该方法包括以下步骤：
    提供发光单元；以及
    提供发电单元以对所述发光单元供电，其中，所述发电单元与所述出光面彼此面对且间隔开，使得所述发光单元发出的光线进入所述发电单元与所述出光面之间并从所述出光面射出所述背光模组，所述发电单元在远离所述出光面的方向上包括第一电极、发电层和第二电极，所述第一电极构造为反射来自所述发光单元的光线。
  16. 根据权利要求15所述的制作方法，还包括提供位于所述发电单元与所述出光面之间的导光板，其中提供发电单元的步骤包括：在所述导光板上沉积导电薄膜作为所述第一电极。
  17. 根据权利要求15或16所述的制作方法，其中，提供发电单元的步骤包括：
    提供一个发电单元；
    在所述发电单元上设置配重层；
    在所述配重层上设置另一个发电单元。
  18. 一种显示装置，包括显示面板以及权利要求1至14中任一项所述的背光模组。
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