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WO2014063364A1 - 一种液晶显示装置及其背光模组 - Google Patents

一种液晶显示装置及其背光模组 Download PDF

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Publication number
WO2014063364A1
WO2014063364A1 PCT/CN2012/083608 CN2012083608W WO2014063364A1 WO 2014063364 A1 WO2014063364 A1 WO 2014063364A1 CN 2012083608 W CN2012083608 W CN 2012083608W WO 2014063364 A1 WO2014063364 A1 WO 2014063364A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
substrate
elastic member
light
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2012/083608
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English (en)
French (fr)
Inventor
苏赞加
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
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 Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/697,969 priority Critical patent/US8926163B2/en
Priority to DE112012006952.8T priority patent/DE112012006952B4/de
Publication of WO2014063364A1 publication Critical patent/WO2014063364A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B6/0081—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
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • FIG. 1 is a schematic cross-sectional view of a prior art side-lit LED backlight module.
  • the distance d between the LED 10 and the light guide plate 11 is a coupling distance.
  • Different coupling distances correspond to different coupling efficiency.
  • FIG. 2 is a line diagram showing the coupling light efficiency of the light guide plate with a thickness of 2 mm as a function of the coupling light distance.
  • the coupling distance is increased from 0.1 mm to 0.8 mm, the coupling is performed.
  • the light efficiency was also reduced from 87% to 80%, and the brightness of the backlight module was also reduced from 300 nits at a coupling distance of 0.1 mm to 276 nits at a coupling distance of 0.8 mm.
  • the inventors of the present invention found that due to problems of mechanism parameter tolerance, assembly deviation, and thermal expansion of the light guide plate, the coupling light distance may deviate from the design value, for example, the coupling distance is biased. Large, which in turn affects the brightness of the backlight module.
  • the light source is disposed adjacent to the first side edge, and the second side edge or the fourth side edge of the light guide plate is disposed And a fixing hole or a fixing hole facing the substrate;
  • the light source comprises a substrate and a light emitting device disposed on one side of the substrate, the light emitting device is disposed toward the first side of the light guide plate, and the spacer is spaced apart from the first side of the light guide plate and the base of the light source a first distance between the first side of the light guide plate and the light emitting device of the light source;
  • the first pillar is at least partially fixed in the fixing groove or the fixing hole of the light guide plate, and protrudes at least partially toward the surface of the light guide plate toward the substrate,
  • the substrate is provided with a slit corresponding to the position of the first cylinder, such that a portion of the first pillar protruding from the surface of the light guide plate passes through the slit of the substrate;
  • the elastic member is disposed on a side of the substrate facing away from the
  • the backlight module further includes a second cylinder, the second cylinder is vertically fixed on a surface of the substrate opposite to the side of the light guide plate, and the second end of the elastic member is connected to the second cylinder.
  • the light source comprises a substrate and a light emitting device disposed on one side of the substrate, the light emitting device is disposed toward the first side of the light guide plate, and the spacer is spaced apart from the first side of the light guide plate and the base of the light source Between the first side of the light guide plate and the light emitting device of the light source having a minimum distance; the first pillar is at least partially fixed in the fixing groove or the fixing hole of the light guide plate, and protrudes at least partially toward the surface of the light guide plate toward the substrate a slit is disposed at a position corresponding to the first pillar of the substrate, such that a portion of the first pillar protruding from the surface of the light guide plate passes through the slit of the substrate; and the elastic member is disposed at a side of the substrate facing away from the light guide plate, and The first end and the second end, the first end of the elastic member is connected to one end of the slit of the first cylinder passing through the
  • the thickness of the spacer is equal to or greater than the thickness of the light guide plate.
  • the backlight module further includes a second cylinder, the second cylinder is vertically fixed on a surface of the substrate opposite to the side of the light guide plate, and the second end of the elastic member is connected to the second cylinder.
  • the elastic member is a spring.
  • the number of the spacers is at least two, respectively corresponding to the two ends of the first side of the light guide plate.
  • the backlight module further includes an optical film disposed on a side of the light guide plate opposite to the substrate.
  • a liquid crystal display device comprising: a backlight module, comprising: a substrate, a light guide plate, a first pillar, a light source, a spacer, and an elastic member;
  • the light guide plate is disposed on the substrate, and the light guide plate includes a first side edge, a second side edge, a third side edge, and a fourth side edge connected end to end in sequence, the light source is disposed adjacent to the first side edge, and the second light guide plate is disposed.
  • the light source comprises a substrate and a light emitting device disposed on a side of the substrate, the light emitting device is disposed toward the first side of the light guide plate, and the spacer is spaced apart from the light guide plate Between the one side and the base of the light source, the first side of the light guide plate and the light emitting device of the light source have a minimum distance; the first cylinder is at least partially fixed in the fixing groove or the fixing hole of the light guide plate, and at least partially The substrate protrudes from the surface of the light guide plate, and the substrate is provided with a slit corresponding to the position of the first cylinder, such that a portion of the first pillar protruding from the surface of the light guide plate passes through the slit of the substrate; the elastic member is disposed on the substrate a first end of the light guide plate, and including a first end and a second end, the first end of the elastic member is connected to one end of the
  • the second end of the elastic member is away from the first side of the first side of the light guide plate; the elastic member moves the light guide plate toward the light source by pushing the first cylinder until the distance between the light guide plate and the light emitting device of the light source reaches a minimum distance, And the elastic member is still in a compressed state; the slit direction of the substrate is consistent with the direction in which the light guide plate moves toward the light source; and the liquid crystal display device further includes a display panel disposed on a side of the light guide plate opposite to the substrate.
  • the thickness of the spacer is equal to or greater than the thickness of the light guide plate.
  • the backlight module further includes a second cylinder, the second cylinder is vertically fixed on a surface of the substrate opposite to the side of the light guide plate, and the second end of the elastic member is connected to the second cylinder.
  • the elastic member is a spring.
  • the invention has the beneficial effects that the first embodiment of the present invention is different from the prior art, and the first side of the light guide plate and the light-emitting device of the light source are disposed between the first side of the light guide plate and the substrate of the light source through the spacer.
  • the first column is at least partially fixed in the fixing groove or the fixing hole of the light guide plate, the elastic member is disposed on a side of the substrate opposite to the light guide plate, and the first end of the elastic member is connected to the first column
  • the body passes through one end of the slit of the substrate, and the second end is directly or indirectly connected to the substrate.
  • the second end of the elastic member is away from the first side of the light guide plate than the first end, and the elastic member guides the first cylinder
  • the light plate moves toward the light source until the distance between the light guide plate and the light emitting device of the light source reaches the minimum distance, and at this time, the elastic member is still in a compressed state, which can reduce the probability of the coupling light distance changing, and the module brightness and design value Better to be consistent.
  • FIG. 1 is a schematic cross-sectional view of a side-entry LED backlight module of the prior art
  • FIG. 2 is a line graph showing a coupling light efficiency of a light guide plate having a thickness of 2 mm as a function of a coupling light distance;
  • FIG. 3 is a perspective view of an embodiment of a backlight module of the present invention.
  • FIG. 4 is a bottom view showing an embodiment of a backlight module of the present invention.
  • FIG. 5 is a top plan view of an embodiment of a backlight module of the present invention.
  • Figure 6 is an enlarged view of a portion A of Figure 5;
  • FIG. 7 is a perspective view of a light guide plate and a first cylinder in an embodiment of a backlight module of the present invention.
  • Figure 8 is a perspective view showing an embodiment of a liquid crystal display device of the present invention.
  • FIG. 3 is a perspective view of an embodiment of a backlight module of the present invention
  • FIG. 4 is a bottom view of the backlight module of the present invention
  • FIG. 6 is an enlarged view of a portion A of FIG. 5
  • FIG. 7 is a perspective view of a light guide plate and a first cylinder in the embodiment of the backlight module of the present invention.
  • the backlight module 20 embodiment of the present invention includes a substrate 21, a light guide plate 22, an optical film 29, a first cylinder 23, a second cylinder 24, a light source (25, 26), a spacer 27, and an elastic member 28.
  • the light guide plate 22 is disposed on the substrate 21, wherein the light guide plate 22 includes a first side edge 221, a second side edge 222, a third side edge 223, and a fourth side edge 224 that are connected end to end.
  • the light source (25, 26) is disposed adjacent to the first side 221 of the light guide plate 22.
  • a fixing groove 225 or a fixing hole facing the substrate 21 is provided at the second side 222 or the fourth side 224 of the light guide plate 22.
  • the substrate 21 can be selected as a backing plate.
  • the optical film 29 is disposed on a side of the light guide plate 22 opposite to the substrate 21, and the optical film 29 is an optical diffusion film or an optical brightness enhancement film, and the number thereof is at least one.
  • the light source (25, 26) includes a substrate 25 and a light emitting device 26 disposed on a side of the substrate 25.
  • the light emitting device 26 is disposed toward the first side 221 of the light guide plate 22.
  • the spacer 27 is spaced apart from the first side 221 of the light guide plate 22 and the light source. Between the substrates 25 of (25, 26), there is a minimum distance D between the first side 221 of the light guide plate 22 and the light emitting device 26 of the light source (25, 26).
  • the minimum distance D is equal to the height of the spacer 27 in the direction toward the first side 221 of the light guide plate 22, which is higher than the height of the portion of the light emitting device 26, that is, the minimum distance D is the coupling distance (the surface of the light emitting device 26 and the light guide plate 22 are first.
  • the distance between the side edges 221), the minimum distance D can be designed according to actual needs.
  • the light source (25, 26) can be a light bar
  • the light emitting device 26 can be an LED (Light) Emitting Diode, LED).
  • Spacer 27 can be a screw or other piece of rigid material.
  • the thickness T of the spacer 27 is equal to or greater than the thickness of the light guide plate to better achieve the effect of having a minimum distance D between the first side 221 of the light guide plate 22 and the light emitting device 26 of the light source (25, 26).
  • the number of the spacers 27 is at least two, which are respectively disposed corresponding to the two ends of the first side 221 of the light guide plate 22.
  • the spacers 27 may be disposed on the substrate 25 of the light source (25, 26), or may be disposed in other manners such that the spacers 27 are spaced apart from the first side 221 of the light guide plate 22 and the substrate 25 of the light source (25, 26). between.
  • the first cylinder 23 is at least partially fixed in the fixing groove 225 or the fixing hole of the light guide plate 22, and at least a part of the first cylinder 23 protrudes toward the surface of the light guide plate 22 toward the substrate 21.
  • the substrate 21 is provided with a slit 211 corresponding to the position of the first pillar 23, such that a portion of the first pillar 23 protruding from the surface of the light guide plate 22 passes through the slit 211 of the substrate 21, and the length and width of the slit 211 are larger than the first The diameter of the cylinder 23.
  • the direction of the slit 211 of the substrate 21 coincides with the direction in which the light guide plate 22 moves toward the light source (25, 26), and the length of the slit 211 is sufficient to move the first pillar 23 toward the light source (25, 26) until the light guide plate 22 A minimum distance D is reached between the one side 221 and the light emitting device 26 of the light source (25, 26).
  • the second pillar 24 is vertically fixed to a surface of the substrate 21 facing away from the side of the light guide plate 22.
  • the elastic member 28 is disposed on a side of the substrate 21 facing away from the light guide plate 22.
  • the elastic member 28 includes a first end 281 and a second end 282.
  • the first end 281 of the elastic member 28 is connected to one end of the slit 211 of the first cylinder 23 passing through the substrate 21.
  • the second end 282 of the elastic member 28 is indirectly connected.
  • the second end 282 of the elastic member 28 is connected to the second cylinder 24 , and the second end 282 of the elastic member 28 is away from the first side 221 of the light guide plate 22 than the first end 281 .
  • the resilient member 28 can be selected as a spring or other resilient member.
  • the second cylinder 24 may also be a member of other shapes such as a rectangular block.
  • the elastic member 28 When the light guide plate 22 is not thermally expanded or is not affected by gravity, vibration, and the like, the elastic member 28 is in a compressed state, and the elastic member 28 has an elastic force, and the elastic force pushes the first side 221 of the light guide plate 22 against the surface of the spacer 27
  • the distance between the light guide plate 22 and the light-emitting device 26 of the light source (25, 26) can be maintained at the above-described minimum distance D.
  • the elastic force can cancel the force of gravity, or expansion, vibration, or the elastic force can push the instantaneous movement of the light guide plate 22, so that the minimum distance D does not change or Basically, the distance between the light guide plate 22 and the light source (25, 26) does not change.
  • the light guide plate 22 is thermally expanded, subjected to gravity or vibration, and the elastic force is insufficient to offset the force such as gravity, the light guide plate 22 is moved away from the light source (25, 26), and is fixed to the light guide plate 22 first.
  • the cylinder 23 compresses the elastic member 28 connected thereto, and further compression deformation of the elastic member 28 generates a larger elastic force than the above-mentioned elastic force, thereby preventing the light guide plate 22 from being further away from the light source (25, 26); in the above-mentioned thermal expansion, subjected to gravity or After the vibration and the like disappear, the elastic member 28 immediately pushes the first cylinder 23 to move the light guide plate 22 toward the light source (25, 26) until the distance between the light guide plate 22 and the light-emitting device 26 of the light source (25, 26) reaches the above.
  • the minimum distance D that is, the first side 221 of the light guide plate 22 opposes the surface of the spacer 27, and the elastic member 28 is still in a compressed state to ensure that the light guide plate 22 continuously resists the spacer 27, so that the module brightness and design value are made. Better to be consistent.
  • the stability between the light guide plate 22 and the first column 23 can be improved without affecting the optical quality of the module.
  • the design of the embodiment of the present invention can greatly reduce or even avoid the problem that the light guide plate 22 is inclined so that the first side edge 221 of the light guide plate 22, that is, the light entering the light source (25, 26) is inclined. Specifically, if the thickness T of the spacer 27 is smaller than the thickness of the light guide plate 22, when the light guide plate 22 is thermally expanded, the top of the light incident surface of the light guide plate 22 is inclined, and the upper and lower portions of the light guide surface of the corresponding light guide plate 22 are caused. The coupling distance is different.
  • the embodiment of the present invention can be well realized by the arrangement of at least two spacers 27 corresponding to the two ends of the first side 221 of the light guide plate 22, and the thickness T of the spacer 27 is equal to or larger than the thickness of the light guide plate 22.
  • the light guide plate 22 has a minimum distance D from the light emitting device 26.
  • the present invention can also provide an embodiment in which the thickness T of the spacer 27 is smaller than the thickness of the light guide plate 22, and also can greatly reduce or even prevent the light guide plate 22 from being inclined so that the first side 221 of the light guide plate 22 is also light-incident. The problem of tilting the light source (25, 26).
  • the portion of the light guide plate 22 remote from the light source (25, 26) is supported by the substrate 21 and does not tilt in the counterclockwise direction in the drawing; on the other hand, even if the light guide plate 22 is caused by some reason It has a first tendency to be inclined in the clockwise direction in the figure with the first side 221 of the interference spacer 27 as the axis, that is, the top of the light incident surface of the light guide plate 22 is inclined toward the light source (25, 26) because A portion of the first cylinder 23 is fixed to the fixing groove 225 or the fixing hole of the light guide plate 22, and the other portion protrudes from the light guide plate 22 to be connected to the elastic member 28, and is subjected to the elastic force of the elastic member 28.
  • This elastic direction is parallel to the direction of the substrate 21 toward the light source (25, 26), and acts on the combination including the light guide plate 22 and the first cylinder 23, which is viewed as a fulcrum by the spacer 27.
  • the top of the light incident surface of the light guide plate 22 causes a second tendency to tilt away from the light source (25, 26).
  • the first trend described above is offset by the second trend, that is, the tilting directions of the opposite directions of the light incident surface of the light guide plate 22 cancel each other and finally reach an equilibrium state, and the light incident surface of the light guide plate 22 is kept not tilted, so that the corresponding guide
  • the coupling distances of the upper and lower portions of the light incident surface of the light plate 22 are the same.
  • the arrangement of the second cylinder 24 can also be eliminated, and the second end 282 of the elastic member 28 is directly connected to the substrate 21, which is not limited thereto.
  • the backlight module 20 of the present invention is spaced between the first side 221 of the light guide plate 22 and the substrate 25 of the light source (25, 26) by the spacer 27, so that the first side 221 of the light guide plate 22 and the light source ( 25, 26) have a minimum distance D between the light-emitting devices 26;
  • the elastic member 28 moves the light guide plate 22 toward the light source (25, 26) by pushing the first cylinder 23 until the light guide plate 22 and the light source (25, 26)
  • the distance between the light-emitting devices 26 reaches the minimum distance D described above, and at this time, the elastic member 28 is still in a compressed state, which can reduce the probability of the change of the coupling distance, so that the brightness of the module is better aligned with the design value.
  • FIG. 8 is a perspective view of an embodiment of a liquid crystal display device of the present invention.
  • the liquid crystal display device 30 embodiment of the present invention includes a display panel 31 and a backlight module 20.
  • the backlight module 20 can be a backlight module as shown in FIGS. 3-7, and includes a substrate 21, a light guide plate 22, an optical film 29, a first cylinder 23, a second cylinder 24, and a light source (25, 26). ), the spacer 27 and the elastic member 28.
  • the light guide plate 22 is disposed on the substrate 21, wherein the light guide plate 22 includes a first side edge 221, a second side edge 222, a third side edge 223, and a fourth side edge 224 that are connected end to end.
  • the light source (25, 26) is disposed adjacent to the first side 221 of the light guide plate 22.
  • a fixing groove 225 or a fixing hole facing the substrate 21 is provided at the second side 222 or the fourth side 224 of the light guide plate 22.
  • the display panel 31 is disposed on a side of the light guide plate 22 that faces away from the substrate 21.
  • the optical film 29 is disposed between the light guide plate 22 and the display panel 31.
  • the optical film 29 is an optical diffusion film or an optical brightness enhancement film, and the number thereof is at least one.
  • the light source (25, 26) includes a substrate 25 and a light emitting device 26 disposed on a side of the substrate 25.
  • the light emitting device 26 is disposed toward the first side 221 of the light guide plate 22.
  • the spacer 27 is spaced apart from the first side 221 of the light guide plate 22 and the light source. Between the substrates 25 of (25, 26), there is a minimum distance D between the first side 221 of the light guide plate 22 and the light emitting device 26 of the light source (25, 26).
  • the thickness T of the spacer 27 is equal to or larger than the thickness of the light guide plate.
  • the number of the spacers 27 is at least two, which are respectively disposed corresponding to the two ends of the first side 221 of the light guide plate 22.
  • the first cylinder 23 is at least partially fixed in the fixing groove 225 or the fixing hole of the light guide plate 22, and at least a part of the first cylinder 23 protrudes toward the surface of the light guide plate 22 toward the substrate 21.
  • the substrate 21 is provided with a slit 211 at a position corresponding to the first pillar 23 such that a portion of the first pillar 23 protruding from the surface of the light guide plate 22 passes through the slit 211 of the substrate 21.
  • the direction of the slit 211 of the substrate 21 coincides with the direction in which the light guide plate 22 moves toward the light source (25, 26).
  • the second pillar 24 is vertically fixed to a surface of the substrate 21 facing away from the side of the light guide plate 22.
  • the elastic member 28 is disposed on a side of the substrate 21 facing away from the light guide plate 22.
  • the elastic member 28 includes a first end 281 and a second end 282.
  • the first end 281 of the elastic member 28 is connected to one end of the slit 211 of the first cylinder 23 passing through the substrate 21.
  • the second end 282 of the elastic member 28 is connected to The second end 282 of the elastic member 28 is away from the first side 221 of the light guide plate 22 from the first end 281.
  • the elastic member 28 moves the light guide plate 22 toward the light source (25, 26) by pushing the first cylinder 23 until the distance between the light guide plate 22 and the light-emitting device 26 of the light source (25, 26) reaches a minimum distance D, and at this time The resilient member 28 is still in a compressed state.
  • the liquid crystal display device 30 can be a TFT-LCD (Thin Film Transistor-Liquid Crystal) Display, thin film field effect transistor liquid crystal display), can also be other types of liquid crystal display devices.
  • TFT-LCD Thin Film Transistor-Liquid Crystal
  • LCD Thin Film Transistor-Liquid Crystal

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  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
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  • Planar Illumination Modules (AREA)

Abstract

一种液晶显示装置（30）及其背光模组（20）。背光模组（20）包括基板（21）、导光板（22）、第一柱体（23）、光源（25，26）、间隔件（27）以及弹性件（28）。间隔件（27）使导光板（22）和光源（25，26）的发光器件（26）之间具有一最小距离（D），弹性件（28）第一段连接于第一柱体（23）穿过基板（21）的狭缝的一端，弹性件（28）第二端连接于基板（21）；弹性件（28）通过推动第一柱体（23）使导光板（22）朝光源（25，26）移动，直至导光板（22）和光源（25，26）的发光器件（26）之间的距离到达最小距离（D）。该液晶显示装置（30）及其背光模组（20）能够减少耦光距离发生变化的几率，使模组发光亮度与设计值更好地保持一致。

Description

一种液晶显示装置及其背光模组
【技术领域】
本发明涉及液晶显示技术领域，特别是涉及一种液晶显示装置及其背光模组。
【背景技术】
在侧入式LED背光模组中，耦光效率为影响背光模组亮度的重要因素，耦光效率即为LED的光能量传递进入到导光板的效率。而耦光效率与耦光距离有关，耦光距离即为LED出光面端面到导光板入光面端面之间的距离。
参阅图1，图1是现有技术一种侧入式LED背光模组的截面示意图，LED10与导光板11之间的距离d即为耦光距离。不同的耦光距离对应不同的耦光效率。参阅图2，图2是对应厚度为2mm的导光板的耦光效率随耦光距离变化的折线图，从图2中可看出，当耦光距离由0.1mm增大至0.8mm时，耦光效率也由87%减少至80%，进而背光模组的亮度也由耦光距离为0.1mm时的300nits下降至耦光距离为0.8mm时的276nits。
本申请发明人在长期研发中发现，由于各个部材的机构参数公差、组装偏差、导光板受热膨胀等问题的存在，都可能会带来耦光距离偏离设计值的变化，比如，耦光距离偏大，进而影响背光模组的亮度。
【发明内容】
为了至少部分解决以上问题，本发明提出了一种液晶显示装置及其背光模组，能够减少耦光距离发生变化的几率，使模组发光亮度与设计值更好地保持一致。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种背光模组，包括：基板、导光板、第一柱体、光源、间隔件以及弹性件；其中，导光板设置于基板上，导光板包括依序首尾相连的第一侧边、第二侧边、第三侧边以及第四侧边，光源邻近第一侧边设置，导光板的第二侧边或第四侧边处设有朝向基板的固定槽或固定孔；光源包括基底和设置于基底一侧的发光器件，发光器件朝向导光板第一侧边设置，间隔件间隔于导光板第一侧边和光源的基底之间，使导光板第一侧边和光源的发光器件之间具有一最小距离；第一柱体至少部分固定于导光板的固定槽或固定孔中，并且至少部分朝基板突出于导光板表面，基板对应第一柱体的位置设有狭缝，使得第一柱体突出于导光板表面的部分穿过基板的狭缝；弹性件设置于基板背对导光板的一侧，并且包括第一端和第二端，弹性件第一端连接于第一柱体穿过基板的狭缝的一端，弹性件第二端直接或间接连接于基板上，弹性件的第二端较第一端远离导光板的第一侧边；弹性件通过推动第一柱体使导光板朝光源移动，直至导光板和光源的发光器件之间的距离到达最小距离，并且此时弹性件仍处于压缩状态；基板的狭缝方向与导光板向光源移动的方向一致；间隔件的厚度等于或大于导光板的厚度；间隔件的数量为至少两个，分别对应导光板第一侧边的两端设置。
其中，背光模组还包括第二柱体，第二柱体竖直固定于基板背对导光板一侧的表面，弹性件的第二端连接于第二柱体。
其中，弹性件是弹簧。
其中，背光模组还包括光学膜片，光学膜片设置于导光板背对基板的一侧。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种背光模组，包括：基板、导光板、第一柱体、光源、间隔件以及弹性件；其中，导光板设置于基板上，导光板包括依序首尾相连的第一侧边、第二侧边、第三侧边以及第四侧边，光源邻近第一侧边设置，导光板的第二侧边或第四侧边处设有朝向基板的固定槽或固定孔；光源包括基底和设置于基底一侧的发光器件，发光器件朝向导光板第一侧边设置，间隔件间隔于导光板第一侧边和光源的基底之间，使导光板第一侧边和光源的发光器件之间具有一最小距离；第一柱体至少部分固定于导光板的固定槽或固定孔中，并且至少部分朝基板突出于导光板表面，基板对应第一柱体的位置设有狭缝，使得第一柱体突出于导光板表面的部分穿过基板的狭缝；弹性件设置于基板背对导光板的一侧，并且包括第一端和第二端，弹性件第一端连接于第一柱体穿过基板的狭缝的一端，弹性件第二端直接或间接连接于基板上，弹性件的第二端较第一端远离导光板的第一侧边；弹性件通过推动第一柱体使导光板朝光源移动，直至导光板和光源的发光器件之间的距离到达最小距离，并且此时弹性件仍处于压缩状态；基板的狭缝方向与导光板向光源移动的方向一致。
其中，间隔件的厚度等于或大于导光板的厚度。
其中，背光模组还包括第二柱体，第二柱体竖直固定于基板背对导光板一侧的表面，弹性件的第二端连接于第二柱体。
其中，弹性件是弹簧。
其中，间隔件的数量为至少两个，分别对应导光板第一侧边的两端设置。
其中，背光模组还包括光学膜片，光学膜片设置于导光板背对基板的一侧。
为解决上述技术问题，本发明采用的又一个技术方案是：提供一种液晶显示装置，包括：背光模组，其包括：基板、导光板、第一柱体、光源、间隔件以及弹性件；其中，导光板设置于基板上，导光板包括依序首尾相连的第一侧边、第二侧边、第三侧边以及第四侧边，光源邻近第一侧边设置，导光板的第二侧边或第四侧边处设有朝向基板的固定槽或固定孔；光源包括基底和设置于基底一侧的发光器件，发光器件朝向导光板第一侧边设置，间隔件间隔于导光板第一侧边和光源的基底之间，使导光板第一侧边和光源的发光器件之间具有一最小距离；第一柱体至少部分固定于导光板的固定槽或固定孔中，并且至少部分朝基板突出于导光板表面，基板对应第一柱体的位置设有狭缝，使得第一柱体突出于导光板表面的部分穿过基板的狭缝；弹性件设置于基板背对导光板的一侧，并且包括第一端和第二端，弹性件第一端连接于第一柱体穿过基板的狭缝的一端，弹性件第二端直接或间接连接于基板上，弹性件的第二端较第一端远离导光板的第一侧边；弹性件通过推动第一柱体使导光板朝光源移动，直至导光板和光源的发光器件之间的距离到达最小距离，并且此时弹性件仍处于压缩状态；基板的狭缝方向与导光板向光源移动的方向一致；液晶显示装置还包括显示面板，设置于导光板背对基板的一侧。
其中，间隔件的厚度等于或大于导光板的厚度。
其中，背光模组还包括第二柱体，第二柱体竖直固定于基板背对导光板一侧的表面，弹性件的第二端连接于第二柱体。
其中，弹性件是弹簧。
本发明的有益效果是：区别于现有技术的情况，本发明实施方式通过间隔件间隔于导光板第一侧边和光源的基底之间，使导光板第一侧边和光源的发光器件之间具有一最小距离；同时，第一柱体至少部分固定于导光板的固定槽或固定孔中，弹性件设置于基板背对导光板的一侧，弹性件的第一端连接于第一柱体穿过基板的狭缝的一端，第二端直接或间接连接于基板上，弹性件的第二端较第一端远离导光板的第一侧边，弹性件通过推动第一柱体使导光板朝光源移动，直至导光板和光源的发光器件之间的距离到达上述最小距离，并且此时弹性件仍处于压缩状态，能够减少耦光距离发生变化的几率，使模组发光亮度与设计值更好地保持一致。
【附图说明】
图1是现有技术一种侧入式LED背光模组的截面示意图；
图2是对应厚度为2mm的导光板的耦光效率随耦光距离变化的折线图；
图3是本发明背光模组实施方式的立体示意图；
图4是本发明背光模组实施方式的仰视示意图；
图5是本发明背光模组实施方式的俯视示意图；
图6是图5中的局部A放大图；
图7是本发明背光模组实施方式中导光板与第一柱体的立体示意图；
图8是本发明液晶显示装置实施方式的立体示意图。
【具体实施方式】
下面将结合本发明实施方式中的附图，对本发明实施方式中的技术方案进行清楚、完整地描述，显然，所描述的实施方式仅仅是本发明一部分实施方式，而不是全部的实施方式。基于本发明中的实施方式，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方式，均属于本发明保护的范围。
请一并参阅图3、4、5、6、7，其中图3是本发明背光模组实施方式的立体示意图；图4是本发明背光模组实施方式的仰视示意图；图5是本发明背光模组实施方式的俯视示意图；图6是图5中的局部A放大图；图7是本发明背光模组实施方式中导光板与第一柱体的立体示意图。
本发明背光模组20实施方式包括基板21、导光板22、光学膜片29、第一柱体23、第二柱体24、光源（25、26）、间隔件27以及弹性件28。
导光板22设置于基板21上，其中，导光板22包括依序首尾相连的第一侧边221、第二侧边222、第三侧边223以及第四侧边224。光源（25、26）邻近导光板22的第一侧边221设置。导光板22的第二侧边222或第四侧边224处设有朝向基板21的固定槽225或固定孔。基板21可选取为背板。光学膜片29设置于导光板22背对基板21的一侧，光学膜片29为光学扩散膜或者光学增亮膜，其数量至少为一。
光源（25、26）包括基底25和设置于基底25一侧的发光器件26，发光器件26朝向导光板22第一侧边221设置，间隔件27间隔于导光板22第一侧边221和光源（25、26）的基底25之间，使导光板22第一侧边221和光源（25、26）的发光器件26之间具有一最小距离D。最小距离D的大小等于间隔件27在朝向导光板22第一侧边221方向上高于发光器件26部分的高度大小，即最小距离D为耦光距离（发光器件26表面与导光板22第一侧边221之间的距离），最小距离D的大小可根据实际需要而设计。其中，光源（25、26）可为灯条，发光器件26可为LED（Light Emitting Diode，发光二极管）。间隔件27可为螺丝或其他具有一定刚性的部件。
间隔件27的厚度T等于或大于导光板的厚度，以更好地实现导光板22第一侧边221和光源（25、26）的发光器件26之间具有一最小距离D的效果。间隔件27的数量为至少两个，分别对应导光板22第一侧边221的两端设置。间隔件27可设置于光源（25、26）的基底25上，也可采用其他方式进行设置而使间隔件27间隔于导光板22第一侧边221和光源（25、26）的基底25之间。
第一柱体23至少部分固定于导光板22的固定槽225或固定孔中，并且至少部分第一柱体23朝基板21突出于导光板22表面。基板21对应第一柱体23的位置设有狭缝211，使得第一柱体23突出于导光板22表面的部分穿过基板21的狭缝211，狭缝211的长度和宽度均大于第一柱体23的直径。基板21的狭缝211方向与导光板22向光源（25、26）移动的方向一致，并且狭缝211的长度足够第一柱体23向光源（25、26）方向移动，直至导光板22第一侧边221和光源（25、26）的发光器件26之间达到最小距离D。
第二柱体24竖直固定于基板21背对导光板22一侧的表面。弹性件28设置于基板21背对导光板22的一侧。弹性件28包括第一端281和第二端282，弹性件28的第一端281连接于第一柱体23穿过基板21的狭缝211的一端，弹性件28的第二端282间接连接于基板21上即弹性件28的第二端282连接于第二柱体24，弹性件28的第二端282较第一端281远离导光板22的第一侧边221。弹性件28可选取为弹簧或其他具有一定弹性的部件。在其他实施方式中，第二柱体24也可为矩形块等其他形状的部件。
在导光板22未受热膨胀或未受重力、震动等因素影响时，此时弹性件28处于压缩状态，弹性件28具有弹力，弹力推动导光板22的第一侧边221抵触间隔件27的表面，能够使导光板22和光源（25、26）的发光器件26之间的距离保持为上述最小距离D。在导光板22受热膨胀、受到重力或震动且上述弹力足够大时，弹力能够抵消重力、或膨胀、震动时的冲力，或者弹力能够推动导光板22的瞬间移动，使得最小距离D不会变化或基本不会变化，即导光板22和光源（25、26）之间的距离不会变化。在导光板22受热膨胀、受到重力或震动且上述弹力不足以抵消重力等作用力的情况下，导光板22会朝向远离光源（25、26）的方向移动，固定于导光板22上的第一柱体23压缩与其连接的弹性件28，弹性件28进一步发生压缩形变会产生较上述弹力更大的弹力，进而防止导光板22进一步远离光源（25、26）；在上述受热膨胀、受到重力或震动等因素消失后，弹性件28立即推动第一柱体23使导光板22朝光源（25、26）移动，直至导光板22和光源（25、26）的发光器件26之间的距离达到上述最小距离D，即导光板22的第一侧边221抵触间隔件27的表面，并且此时弹性件28仍处于压缩状态以保证导光板22持续抵触间隔件27，使模组发光亮度与设计值更好地保持一致。
此外，本实施方式通过在导光板22开设固定槽225或固定孔，既能提高导光板22与第一柱体23之间的稳定性又不会影响模组的光学品质。
另外，上述本发明实施方式的设计，还可以大幅减少甚至避免导光板22倾斜而使得导光板22第一侧边221也即入光面向光源（25、26）方向倾斜的问题。具体为，若间隔件27的厚度T小于导光板22的厚度，则当导光板22受热膨胀后会导致导光板22入光面的顶部倾斜，而使对应导光板22入光面的上下两部分的耦光距离不同。此时，本发明实施方式通过对应导光板22第一侧边221的两端的至少两个间隔件27的设置，且间隔件27的厚度T等于或大于导光板22的厚度，能够很好地实现导光板22与发光器件26之间具有一最小距离D。
进一步地，本发明同样可以提供间隔件27的厚度T小于导光板22的厚度的实施方式，并且同样可以大幅减少甚至避免导光板22倾斜而使得导光板22第一侧边221也即入光面向光源（25、26）方向倾斜的问题。原因为：一方面，导光板22远离光源（25、26）的部分受到基板21的承托，不会沿图中的逆时针方向倾斜；另一方面，即使导光板22由于某种原因而导致其以抵触间隔件27的第一侧边221为轴，而具有沿图中的顺时针方向倾斜的第一趋势，即导光板22入光面的顶部朝向光源（25、26）方向倾斜，因为第一柱体23一部分固定于导光板22的固定槽225或固定孔中，另一部分突出导光板22而连接于弹性件28，并且受到弹性件28的弹力。此弹力方向为平行于基板21的朝向光源（25、26）的方向，并且会作用于包括导光板22和第一柱体23在内的组合体，此组合体以间隔件27看为支点，在弹性件28的弹力作用下，使得导光板22入光面的顶部会产生远离光源（25、26）方向倾斜的第二趋势。上述的第一趋势会被第二趋势抵消，即导光板22入光面的两个相反方向的倾斜趋势相互抵消而最终达到平衡状态，导光板22入光面保持不倾斜的状态，使得对应导光板22入光面的上下两部分的耦光距离一致。
此外，在其他实施方式中，也可取消第二柱体24的设置，弹性件28的第二端282直接连接于基板21上，此处不作过多限制。
可以理解，本发明背光模组20实施方式通过间隔件27间隔于导光板22第一侧边221和光源（25、26）的基底25之间，使导光板22第一侧边221和光源（25、26）的发光器件26之间具有一最小距离D；弹性件28通过推动第一柱体23使导光板22朝光源（25、26）移动，直至导光板22和光源（25、26）的发光器件26之间的距离到达上述最小距离D，并且此时弹性件28仍处于压缩状态，能够减少耦光距离发生变化的几率，使模组发光亮度与设计值更好地保持一致。
请一并参阅图3、4、5、6、7、8，其中图8是本发明液晶显示装置实施方式的立体示意图。
本发明液晶显示装置30实施方式包括显示面板31和背光模组20。
其中，背光模组20可以是如图3~7所示的背光模组，包括基板21、导光板22、光学膜片29、第一柱体23、第二柱体24、光源（25、26）、间隔件27以及弹性件28。导光板22设置于基板21上，其中，导光板22包括依序首尾相连的第一侧边221、第二侧边222、第三侧边223以及第四侧边224。光源（25、26）邻近导光板22的第一侧边221设置。导光板22的第二侧边222或第四侧边224处设有朝向基板21的固定槽225或固定孔。显示面板31设置于导光板22背对基板21的一侧。光学膜片29设置于导光板22和显示面板31之间，光学膜片29为光学扩散膜或者光学增亮膜，其数量至少为一。
光源（25、26）包括基底25和设置于基底25一侧的发光器件26，发光器件26朝向导光板22第一侧边221设置，间隔件27间隔于导光板22第一侧边221和光源（25、26）的基底25之间，使导光板22第一侧边221和光源（25、26）的发光器件26之间具有一最小距离D。间隔件27的厚度T等于或大于导光板的厚度。间隔件27的数量为至少两个，分别对应导光板22第一侧边221的两端设置。
第一柱体23至少部分固定于导光板22的固定槽225或固定孔中，并且至少部分第一柱体23朝基板21突出于导光板22表面。基板21对应第一柱体23的位置设有狭缝211，使得第一柱体23突出于导光板22表面的部分穿过基板21的狭缝211。基板21的狭缝211方向与导光板22向光源（25、26）移动的方向一致。
第二柱体24竖直固定于基板21背对导光板22一侧的表面。弹性件28设置于基板21背对导光板22的一侧。弹性件28包括第一端281和第二端282，弹性件28的第一端281连接于第一柱体23穿过基板21的狭缝211的一端，弹性件28的第二端282连接于第二柱体24，弹性件28的第二端282较第一端281远离导光板22的第一侧边221。弹性件28通过推动第一柱体23使导光板22朝光源（25、26）移动，直至导光板22和光源（25、26）的发光器件26之间的距离到达最小距离D，并且此时弹性件28仍处于压缩状态。
液晶显示装置30可以为TFT-LCD（Thin Film Transistor-Liquid Crystal Display，薄膜场效应晶体管液晶显示器），也可为其他类型的液晶显示装置。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (14)

  1. 一种背光模组，其中，包括：
    基板、导光板、第一柱体、光源、间隔件以及弹性件；
    其中，所述导光板设置于基板上，所述导光板包括依序首尾相连的第一侧边、第二侧边、第三侧边以及第四侧边，所述光源邻近第一侧边设置，所述导光板的第二侧边或第四侧边处设有朝向基板的固定槽或固定孔；
    所述光源包括基底和设置于基底一侧的发光器件，所述发光器件朝向导光板第一侧边设置，所述间隔件间隔于导光板第一侧边和光源的基底之间，使所述导光板第一侧边和光源的发光器件之间具有一最小距离；
    所述第一柱体至少部分固定于导光板的固定槽或固定孔中，并且至少部分朝所述基板突出于导光板表面，所述基板对应第一柱体的位置设有狭缝，使得所述第一柱体突出于导光板表面的部分穿过基板的狭缝；
    所述弹性件设置于基板背对导光板的一侧，并且包括第一端和第二端，所述弹性件第一端连接于第一柱体穿过基板的狭缝的一端，所述弹性件第二端直接或间接连接于基板上，所述弹性件的第二端较第一端远离导光板的第一侧边；
    所述弹性件通过推动第一柱体使导光板朝光源移动，直至所述导光板和光源的发光器件之间的距离到达最小距离，并且此时所述弹性件仍处于压缩状态；
    所述基板的狭缝方向与导光板向光源移动的方向一致；
    所述间隔件的厚度等于或大于导光板的厚度；
    所述间隔件的数量为至少两个，分别对应所述导光板第一侧边的两端设置。
  2. 根据权利要求1所述的背光模组，其中，
    所述背光模组还包括第二柱体，所述第二柱体竖直固定于基板背对导光板一侧的表面，所述弹性件的第二端连接于第二柱体。
  3. 根据权利要求1所述的背光模组 ，其中，
    所述弹性件是弹簧。
  4. 根据权利要求1所述的背光模组 ，其中，
    所述背光模组还包括光学膜片，所述光学膜片设置于导光板背对基板的一侧。
  5. 一种背光模组，其中，包括：
    基板、导光板、第一柱体、光源、间隔件以及弹性件；
    其中，所述导光板设置于基板上，所述导光板包括依序首尾相连的第一侧边、第二侧边、第三侧边以及第四侧边，所述光源邻近第一侧边设置，所述导光板的第二侧边或第四侧边处设有朝向基板的固定槽或固定孔；
    所述光源包括基底和设置于基底一侧的发光器件，所述发光器件朝向导光板第一侧边设置，所述间隔件间隔于导光板第一侧边和光源的基底之间，使所述导光板第一侧边和光源的发光器件之间具有一最小距离；
    所述第一柱体至少部分固定于导光板的固定槽或固定孔中，并且至少部分朝所述基板突出于导光板表面，所述基板对应第一柱体的位置设有狭缝，使得所述第一柱体突出于导光板表面的部分穿过基板的狭缝；
    所述弹性件设置于基板背对导光板的一侧，并且包括第一端和第二端，所述弹性件第一端连接于第一柱体穿过基板的狭缝的一端，所述弹性件第二端直接或间接连接于基板上，所述弹性件的第二端较第一端远离导光板的第一侧边；
    所述弹性件通过推动第一柱体使导光板朝光源移动，直至所述导光板和光源的发光器件之间的距离到达最小距离，并且此时所述弹性件仍处于压缩状态；
    所述基板的狭缝方向与导光板向光源移动的方向一致。
  6. 根据权利要求5所述的背光模组，其中，
    所述间隔件的厚度等于或大于导光板的厚度。
  7. 根据权利要求5所述的背光模组，其中，
    所述背光模组还包括第二柱体，所述第二柱体竖直固定于基板背对导光板一侧的表面，所述弹性件的第二端连接于第二柱体。
  8. 根据权利要求5所述的背光模组，其中：
    所述弹性件是弹簧。
  9. 根据权利要求5所述的背光模组，其中，
    所述间隔件的数量为至少两个，分别对应所述导光板第一侧边的两端设置。
  10. 根据权利要求5所述的背光模组，其中，
    所述背光模组还包括光学膜片，所述光学膜片设置于导光板背对基板的一侧。
  11. 一种液晶显示装置，其中，包括：
    背光模组，其包括：
    基板、导光板、第一柱体、光源、间隔件以及弹性件；
    其中，所述导光板设置于基板上，所述导光板包括依序首尾相连的第一侧边、第二侧边、第三侧边以及第四侧边，所述光源邻近第一侧边设置，所述导光板的第二侧边或第四侧边处设有朝向基板的固定槽或固定孔；
    所述光源包括基底和设置于基底一侧的发光器件，所述发光器件朝向导光板第一侧边设置，所述间隔件间隔于导光板第一侧边和光源的基底之间，使所述导光板第一侧边和光源的发光器件之间具有一最小距离；
    所述第一柱体至少部分固定于导光板的固定槽或固定孔中，并且至少部分朝所述基板突出于导光板表面，所述基板对应第一柱体的位置设有狭缝，使得所述第一柱体突出于导光板表面的部分穿过基板的狭缝；
    所述弹性件设置于基板背对导光板的一侧，并且包括第一端和第二端，所述弹性件第一端连接于第一柱体穿过基板的狭缝的一端，所述弹性件第二端直接或间接连接于基板上，所述弹性件的第二端较第一端远离导光板的第一侧边；
    所述弹性件通过推动第一柱体使导光板朝光源移动，直至所述导光板和光源的发光器件之间的距离到达最小距离，并且此时所述弹性件仍处于压缩状态；
    所述基板的狭缝方向与导光板向光源移动的方向一致；
    所述液晶显示装置还包括显示面板，设置于所述导光板背对基板的一侧。
  12. 根据权利要求11所述的液晶显示装置，其中，
    所述间隔件的厚度等于或大于导光板的厚度。
  13. 根据权利要求11所述的液晶显示装置，其中，
    所述背光模组还包括第二柱体，所述第二柱体竖直固定于基板背对导光板一侧的表面，所述弹性件的第二端连接于第二柱体。
  14. 根据权利要求11所述的液晶显示装置，其中，
    所述弹性件是弹簧。
PCT/CN2012/083608 2012-10-24 2012-10-26 一种液晶显示装置及其背光模组 Ceased WO2014063364A1 (zh)

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