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WO2014117401A1 - 膜片定位结构及其背光模组 - Google Patents

膜片定位结构及其背光模组 Download PDF

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Publication number
WO2014117401A1
WO2014117401A1 PCT/CN2013/071332 CN2013071332W WO2014117401A1 WO 2014117401 A1 WO2014117401 A1 WO 2014117401A1 CN 2013071332 W CN2013071332 W CN 2013071332W WO 2014117401 A1 WO2014117401 A1 WO 2014117401A1
Authority
WO
WIPO (PCT)
Prior art keywords
positioning
diaphragm
inclined surface
frame
film
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/CN2013/071332
Other languages
English (en)
French (fr)
Inventor
周革革
李德华
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
Publication of WO2014117401A1 publication Critical patent/WO2014117401A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133322—Mechanical guidance or alignment of LCD panel support components
    • 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

Definitions

  • the present invention is in the field of liquid crystal display, and more particularly, relates to a diaphragm positioning structure and a backlight module thereof. Background technique
  • liquid crystal display LCD
  • LCD liquid crystal display
  • the liquid crystal display device since the liquid crystal itself does not have light-emitting characteristics, it is necessary to provide a backlight to the liquid crystal display device.
  • the optical film In the backlight module, the optical film is warped and deformed by the heat emitted from the backlight at a position close to the backlight, so that the display brightness, uniformity, contrast and viewing angle of the liquid crystal display device are important. The characteristics are deeply affected by the backlight module.
  • various types of diaphragms such as a brightness enhancement film, a diffusion sheet, and a prism sheet, are disposed in the backlight module to make the light emitted by the backlight module more uniformly diverge.
  • various types of diaphragms such as a brightness enhancement film, a diffusion sheet, and a prism sheet, are disposed in the backlight module to The optical uniformity of the backlight module in the liquid crystal display device is improved, and the overall luminance of the backlight module is improved, thereby improving the image quality.
  • FIG. 1 is a schematic diagram showing thermal deformation of a prior art diaphragm
  • FIG. 2 is an enlarged schematic view of a portion A of FIG. 1, which is a schematic diagram of a positioning structure of a diaphragm in the prior art.
  • the backlight module 10 includes at least one film 20, a plastic frame 30, and the like. For convenience of description, the back frame, the light guide plate, and other components are omitted in FIG. 1 and FIG. 2, so as to clearly show the film of the backlight module 10. Slice positioning structure. As shown in FIG.
  • one end edge of the diaphragm 20 has at least one lug 21, and a through hole 22 is defined in the middle of the lug 21, and a corresponding number of fixing posts 31 are disposed on the inner side of the corresponding plastic frame 30, which respectively correspond to multiple
  • the through hole 22 of the lug 21 is engaged with the fixing post 31 to fix the diaphragm 20 to the plastic frame 30.
  • the above design only has the positioning function, and does not consider the temperature change and other factors, which will cause the thermal expansion and contraction effect of the diaphragm, because for the side-entry backlight, the LED generates a large amount of heat and is unevenly distributed, resulting in a diaphragm. Local expansion, easy to cause backlight curtain-like traces 40 phenomenon, resulting in optical performance unevenness, local ripple marks and other issues, seriously affecting the backlight taste. Summary of the invention
  • the object of the present invention is to provide a diaphragm positioning structure, which solves the problem that the diaphragm is warped and deformed due to the temperature variation caused by the temperature change, and is applied to the diaphragm by the cooperation of the slider with the positioning frame and the diaphragm positioning hole. Pulling the stress, thereby flattening the diaphragm, to eliminate the warpage of the diaphragm and improve the taste of the backlight.
  • the present invention provides a diaphragm positioning structure, including a diaphragm and a positioning frame, wherein a rim of the diaphragm has a lug, and a positioning hole is disposed in the middle of the lug, wherein the positioning frame has a surface facing the diaphragm a beveled surface, the first inclined surface and the horizontal plane are at a predetermined angle, and the diaphragm positioning structure further comprises: a slider disposed between the positioning frame and the diaphragm, the slider having a bottom surface in contact with the diaphragm and corresponding to the first inclined surface The second inclined surface, the slope of the second inclined surface is gradually raised toward the outer edge of the diaphragm, and the outer edge of the slider is provided with a positioning protrusion corresponding to the positioning hole, and the positioning protrusion is disposed in the empty hole.
  • the positioning frame comprises a plastic frame and a back frame, and the plastic frame is disposed on the back frame, and the first inclined surface is disposed on the lower surface of the plastic frame top plate.
  • the first inclined surface and the second inclined surface have the same inclination angle.
  • the present invention also provides a diaphragm positioning structure, comprising a diaphragm and a positioning frame, wherein the edge of the diaphragm has a lug, and a positioning hole is arranged in the middle of the lug, wherein the positioning frame is disposed toward the lower surface of the top plate of the diaphragm
  • the insert has a first inclined surface, the first inclined surface is at a predetermined angle with the horizontal plane, and the diaphragm positioning structure further comprises:
  • a slider located between the edge of the diaphragm and the positioning frame, has a bottom surface in contact with the bottom plate of the positioning frame, and a second inclined surface corresponding to the first inclined surface, and the inclination of the second inclined surface is gradually raised toward the outer edge of the diaphragm.
  • the second inclined surface is provided with a positioning protrusion corresponding to the positioning hole, and the positioning protrusion is disposed in the positioning hole.
  • the positioning frame comprises a plastic frame and a back frame, and the plastic frame is disposed on the back frame, and the insert block is disposed on the lower surface of the plastic frame top plate.
  • the slider further has a locking protrusion connected to the bottom surface, the engaging protrusion is composed of a rod portion and a head portion, one end of the rod portion is connected to the bottom surface, and one end is connected to the head portion, and the diameter of the rod portion is smaller than the head portion. diameter.
  • the corresponding engaging lug on the bottom frame of the back frame is provided with a positioning chute, and the positioning chute includes an inlet groove and a track groove connected to the inlet groove, and the width of the inlet groove is larger than the width of the track groove.
  • the diameter of the head of the engaging lug is larger than the width of the track groove of the positioning chute, and the rod of the engaging lug The diameter of the portion is smaller than the width of the track groove of the positioning chute.
  • the first inclined surface and the second inclined surface have the same inclination angle.
  • Another object of the present invention is to provide a backlight module including the diaphragm positioning structure as described above, and a light guide plate and a backlight fixed in the positioning structure, and the diaphragm is fixed by the diaphragm positioning structure. On the light guide plate.
  • the positioning structure of the present invention is used for positioning of a diaphragm, and the mutual squeezing of the inclined surface of the positioning frame and the inclined surface of the slider in the positioning structure, and the positioning of the protrusion of the slider and the positioning hole of the diaphragm are utilized.
  • the optical film can be effectively fixed in the backlight module, and the slider provides the film tensile stress, which is used to solve the problem that the film is warped and deformed by the heat emitted from the backlight when the film is close to the backlight. The problem is to enhance the optical taste of the backlight module.
  • FIG. 1 is a schematic view showing the thermal deformation of a prior art diaphragm.
  • Figure 2 is an enlarged schematic view of a portion A in Figure 1.
  • Figure 3 is a schematic view of a slider of Embodiment 1 of the present invention.
  • FIG. 4 is a cross-sectional view of a backlight module according to Embodiment 1 of the present invention.
  • FIG. 5 is a cross-sectional side view of a backlight module according to Embodiment 1 of the present invention.
  • Fig. 6 is a cross-sectional view showing the diaphragm of the embodiment of the present invention in which the slider is engaged with the inclined surface.
  • Fig. 7 is a side elevational cross-sectional view showing the diaphragm in a state in which the slider is engaged with the inclined surface according to the embodiment of the present invention.
  • Figure 8 is a schematic view of a slider of Embodiment 2 of the present invention.
  • Figure 9 is a cross-sectional view showing a backlight module of Embodiment 2 of the present invention.
  • Figure 10 is a cross-sectional side view showing a backlight module of Embodiment 2 of the present invention.
  • Figure 11 is a cross-sectional view showing the diaphragm of the embodiment of the present invention with the slider engaged with the inclined surface.
  • Figure 12 is a side elevational cross-sectional view showing the diaphragm in accordance with the embodiment of the present invention, in which the slider is engaged with the inclined surface.
  • Figure 13 is a schematic view showing the effect of the present invention.
  • the backlight module 100 includes a diaphragm positioning structure 200 and a guide fixed in the diaphragm positioning structure 200 .
  • the film positioning structure 200 includes a diaphragm 210, a positioning frame 220 and a slider 250.
  • the diaphragm 210 is an optical film.
  • the function of the optical film is to improve the optical uniformity of the backlight module 100 in the liquid crystal display device.
  • the module 100 can produce an optimal light source distribution and improve the quality of the image.
  • the edge of the diaphragm 210 has at least one lug 211, and the positioning hole 212 is disposed in the middle of the lug 211, wherein the positioning hole 212 is a through hole.
  • the plastic frame is usually disposed on one side of the display panel for positioning the backlight module and the display panel, and then the back frame and the plastic frame on one side of the backlight module are combined to fix the backlight module and the display panel.
  • the positioning frame 220 includes a back frame 230 and a plastic frame 240 disposed on the back frame 230.
  • the back frame 230 includes a bottom plate 231 and a first side plate 232 connected to the bottom plate.
  • the plastic frame 240 includes a top plate.
  • the second side plate 244 is connected to the second side plate 244 of the top plate 241.
  • the first side plate 232 is connected to the second side plate 244 to assemble the back frame 230 and the plastic frame 240 to form an accommodating space.
  • the lower surface of the top plate 241 is a first inclined surface 242 at a predetermined angle from the horizontal plane.
  • the diaphragm 210, the slider 250 and the light guide plate 300 are placed in the accommodating space, wherein the slider 250 is placed between the diaphragm 210 and the top plate 241 of the positioning frame 200.
  • the slider 250 has a smooth horizontal bottom surface 251 and a second inclined surface 252 disposed opposite to the bottom surface 251, wherein the second inclined surface 252 is aligned with the inclined angle of the first inclined surface, and the second inclined surface 252 is also visible.
  • the slope is gradually raised toward the outer edge of the diaphragm, and the bottom surface 251 is further provided with a positioning protrusion 253.
  • the positioning protrusion 253 is disposed on the upper side of the second slope 252.
  • the bottom surface 251 is rim and connected to the side wall of the slider 250, but should not be limited thereto.
  • the back frame 230 and the plastic frame 240 are assembled together, that is, the first side plate 232 is connected to the second side plate 244, and the positioning protrusion 253 of the slider 250 is engaged with the positioning hole 212 on the diaphragm 210.
  • the positioning hole is a through hole, and the positioning protrusion 253 disposed on the smooth bottom surface 251 passes through the positioning hole 212 and protrudes from the positioning hole 212. Then, the bottom surface 251 is placed on the diaphragm 210 and the diaphragm 210.
  • the positioning protrusion 253 is received in the positioning hole 212.
  • the slider 250 has not been in contact with the plastic frame 240, that is, there is a gap between the first inclined surface 242 and the second inclined surface 252. Then, a downward pressure is applied to the plastic frame 240.
  • the lower surface of the top plate 241 is adhered to the end surface of the slider 250, that is, the first inclined surface 242 and The second inclined surface 252 is pressed and pressed to press the second inclined surface 252. Under the action of the inclined surface, the plastic frame 240 applies a downward force to the sliding block 250 perpendicular to the second inclined surface 252.
  • the slider 250 For the force decomposition, the slider 250 is received. An outward pull and a downward pressure. As can be seen from the area B in Fig. 7, since the slider 250 is subjected to an outward pulling force, the slider 250 is moved outward on the diaphragm 210, at which time the positioning projection 253 is in contact with the positioning hole 212, and the positioning projection 253 is passed. The positioning hole 212 on the diaphragm 210 is suspended, and the positioning protrusion 253 applies an outward tensile stress to the diaphragm 210, thereby tensioning the diaphragm 210.
  • the slider 250 is also subjected to a downward pressure to press the slider 250 against the diaphragm 210 to prevent the slider 250 from jumping off.
  • the sliding distance, the sliding direction, and the like of the slider 250 can be adjusted, so that the direction and magnitude of the tensile stress can be adjusted, and after the diaphragm 210 is stretched and flattened,
  • the plastic frame 240 is fixed by using a hook, a screw, etc., that is, the first side plate 232 and the second side plate 244 are fixedly connected, and the figure is fixedly connected by screws. It can be understood that, as shown in FIG.
  • the same diaphragm positioning structure 200 can be disposed around the diaphragm 210, so that the diaphragm 210 is subjected to an outward tensile stress around the diaphragm 210, which flattens the diaphragm 210, thereby reducing or even eliminating warpage. And other deformations.
  • the diaphragm 210 may be fixed only by one end through the diaphragm positioning structure 200, and the other end may be fixed by pressing the backlight module mechanism, and the application point may be more than two points, depending on specific requirements.
  • Embodiment 2 Referring to FIG. 8 to FIG. 12, only differences between Embodiment 2 and Embodiment 1 will be described below. As shown in FIG.
  • the positioning frame 220 includes an insert block 243 having a sloped surface, and the insert block 243 is disposed on the top plate 241 except that the back frame 230 and the plastic frame 240 are included.
  • the lower surface, the slope of the insert block 243 is the first slope 242.
  • a positioning chute 270 is formed on the bottom plate 231 so that the slider 250 can slide toward the preset track.
  • the slider 250 is provided with a corresponding engaging protrusion 260 on the bottom surface 251, and the positioning protrusion 253 is disposed on the second inclined surface.
  • the positioning protrusion 253 is connected to the second inclined surface 252, and the higher end adjacent to the second inclined surface 252 is connected to the side wall.
  • the engaging protrusion 260 is disposed at the center of the bottom surface, and the engaging protrusion 260 is composed of a rod portion 261 and a head portion 262.
  • the rod portion 261 is connected to the bottom surface 251, and the other end is connected to the head portion.
  • the diameter of the stem portion 261 is smaller than the diameter of the head portion 262.
  • the positioning chute 270 includes an inlet groove 271 and a track groove 272 connected to the inlet groove 271, wherein the width of the inlet groove 271 is greater than the width of the track groove 272.
  • the diameter of the head 262 is adapted to the width of the inlet groove 271
  • the diameter of the stem portion 261 is adapted to the width of the track groove 272 such that the width of the track groove 272 is smaller than the diameter of the head portion 262.
  • the 231 is on the outside of the diaphragm 210.
  • the head 262 of the engaging projection 260 is passed from the inlet groove 271 of the positioning chute 270 through the bottom plate and protrudes from the bottom plate, and then moved to the end of the track groove 272, wherein the track groove 272 is disposed toward the edge of the bottom plate 231. Since the width of the track groove 272 is smaller than the diameter of the head 262, the engaging protrusion 260 is engaged in the track groove 272, so that the engaging protrusion 260 does not slip off the positioning chute 270 during the sliding process of the slider 250.
  • the bottom surface 251 of the slider 250 is disposed on the bottom plate 231 to be engaged with the bottom plate 231, and the positioning protrusion 253 disposed on the second inclined surface 252 is passed upward through the positioning hole 212 and protrudes from the positioning hole 212. It should be particularly noted that, in order to better fit the first slope 242 and the second slope 252, when the number of the inserts 243 on the plastic frame 240 is more than one, the insert block 243 is on the top plate 241 of the plastic frame 240.
  • the lower surface is spaced apart in parallel, and the spacing of the adjacent insert blocks 243 is not less than the width of the lug 211; correspondingly, when the number of the lugs 211 is more than one, the lugs 211 are arranged in parallel at the edges of the diaphragm 210, and the phases are The pitch of the adjacent lugs 211 is not less than the thickness of the insert block 243.
  • a downward pressure is applied to the plastic frame 240. As shown in FIG. 11 and FIG. 12, during the pressing of the plastic frame 240, the insertion block 243 is matched with the slider 250 through the spacing of the adjacent lugs 211.
  • the first inclined surface 242 on the insert block 243 is pressed against the second inclined surface 252 of the slider 250.
  • the insert block 243 applies a downward force to the slider 250 perpendicular to the second inclined surface 252. Since the engaging protrusion 260 is engaged in the positioning chute 270, the slider 250 slides along the positioning chute 270 on the bottom plate 231.
  • the positioning protrusion 253 disposed on the second inclined surface 252 and passing through the positioning hole 212 and protruding from the positioning hole 212 applies an outward tensile stress to the diaphragm 210, thereby tensioning the diaphragm 210.
  • the positioning structure of the present invention is used for positioning of the diaphragm, and the interaction between the positioning frame inclined surface and the slider inclined surface in the diaphragm positioning structure, and the cooperation of the slider positioning protrusion and the diaphragm positioning hole will be optical.
  • the diaphragm is effectively fixed in the backlight module, and the slider provides the film tensile stress, which is used to solve the problem that the diaphragm is warped and deformed by the heat emitted from the backlight when the film is close to the backlight. Increased the optical taste of the backlight module. While the invention has been particularly shown and described with reference to the exemplary embodiments of the embodiments of the invention Various changes in form and detail.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

提供了一种膜片定位结构（200）及其背光模组（100）。膜片定位结构（200）用于膜片（210）的定位，膜片（210）上具有至少一定位孔（212），膜片定位结构（200）还包括具有朝向膜片（210）的第一斜面（242）的定位框架（220）和滑块（250），滑块（250）位于定位框架（220）和膜片（210）之间，具有与膜片（210）接触的底面（251）、与第一斜面（242）对应接触的第二斜面（252），第二斜面（252）的斜度向膜片（210）外沿方向逐渐抬高，滑块（250）外沿对应定位孔（212）设有定位凸起（253），定位凸起（253）穿设于定位孔（212）中。利用膜片定位结构（200）中定位框架（220）斜面（242）与滑块（250）斜面（252）的相互挤压，滑块（250）向膜片（210）外侧移动时定位凸起（253）挂起定位孔（212）从而对膜片（210）施加一向外的拉应力，拉紧膜片（210）。还提供了另一种滑块与定位框架的连接结构。本发明利用滑块（250）对膜片（210）施加拉应力，用以调节膜片（210）受温度变化所产生的涨缩量来消除膜片（210）翘曲的问题。

Description

说 明 书 膜片定位结构及其背光模组 技术领域
本发明属于液晶显示领域， 更具体地说， 是涉及膜片定位结构及其背光模 组。 背景技术
由于液晶显示装置 （Liquid crystal display, LCD) 具有非常多的优点， 近 年来液晶显示装置已经被广泛地应用于各种电子装置中。
在液晶显示装置中， 由于液晶本身不具有发光特性， 因此， 需要给液晶显 示装置提供背光源。 在背光模组中， 光学膜片在靠近背光源的位置会由于受到 来自背光源所散发的热量而产生翘曲变形， 使得液晶显示装置的显示亮度、 均 匀度、 对比度与可视角度等产品重要特性深受背光模组所影响。 在 LED作为背 光源的液晶显示器中， 为了使背光模组所发出的光线得以更均匀地发散， 在背 光模组中设置各式膜片， 诸如增亮膜、 扩散片以及棱镜片等等， 以提高液晶显 示装置中背光模组的光学均一性， 同时提高背光模组的整体辉度， 从而提高显 像品质。
请参照图 1及图 2， 图 1为现有技术的膜片受热变形示意图， 图 2为图 1 中 A部的放大示意图， 即现有技术中膜片的定位结构示意图。 背光模组 10包 括至少一膜片 20及胶框 30等，为方便说明起见，于图 1和图 2中省略了背框、 导光板以及其他元件，如此以清楚表示出背光模组 10的膜片定位结构。如图 2 所示， 膜片 20的一端边沿具有至少一个凸耳 21， 凸耳 21中间设有通孔 22， 对应的胶框 30内侧则设有对应数量的固定柱 31，分别对应于多个凸耳 21的通 孔 22， 通孔 22与固定柱 31套合， 使膜片 20固定在胶框 30上。 然而， 以上设 计仅有定位功能， 并无考虑温度变化等因素会造成膜片的热涨冷縮效应， 因为 对于侧入式背光源， 由于 LED发热量较大， 而且分布不均， 造成膜片局部膨 胀， 容易引起背光窗帘状痕迹 40现象， 进而产生光学效能不均匀， 局部波紋 痕迹等问题， 严重影响背光品味。 发明内容
本发明的目的在于提供膜片定位结构， 解决膜片受温度变化产生涨縮量引 起膜片翘曲变形的问题， 藉由滑块与定位框架以及膜片定位孔的配合， 对膜片 四周施加拉应力， 从而拉平膜片， 以达到消除膜片的翘曲， 提高背光品味的目 的。
为了实现上述目的，本发明提供一种膜片定位结构，包括膜片及定位框架， 其中， 膜片的边沿具有凸耳， 凸耳中间设有定位孔， 其中， 定位框架具有朝向 膜片的第一斜面， 第一斜面与水平面呈一预定角度， 膜片定位结构还包括： 滑块， 位于定位框架和膜片之间， 所述滑块具有与膜片接触的底面、 与第 一斜面对应接触的第二斜面， 第二斜面的斜度向膜片外沿方向逐渐抬高， 滑块 外沿对应所述定位孔设有定位凸起， 定位凸起穿设于空位孔中。
优选地， 定位框架包含胶框及背框， 胶框设于背框上， 所述第一斜面设于 胶框顶板的下表面。
优选地， 第一斜面与第二斜面的倾斜角度一致。
本发明还提供一种膜片定位结构， 包括膜片及定位框架， 其中， 膜片的边 沿具有凸耳， 凸耳中间设有定位孔， 其中， 所述定位框架朝向膜片的顶板下表 面设有具有第一斜面的插块， 第一斜面与水平面呈一预定角度， 膜片定位结构 还包括：
滑块， 位于膜片边沿下方和定位框架之间， 具有与定位框架底板接触的底 面、 与第一斜面对应接触的第二斜面， 第二斜面的斜度向膜片外沿方向逐渐抬 高， 第二斜面上对应于定位孔设有定位凸起， 定位凸起穿设于定位孔中。
优选地， 定位框架包括胶框及背框， 胶框设于背框上， 所述插块设于胶框 顶板的下表面。
优选地， 滑块还具有与底面连接设置的卡合凸块， 卡合凸块由杆部和头部 组成， 杆部一端与底面连接， 一端与头部连接， 杆部的直径小于头部的直径。
优选地， 背框底板上对应卡合凸块开有定位滑槽， 定位滑槽包括进口槽和 连接于进口槽的轨道槽， 进口槽的宽度大于轨道槽的宽度。
优选地， 卡合凸块的头部直径大于定位滑槽的轨道槽宽度， 卡合凸块的杆 部直径小于定位滑槽的轨道槽宽度。
优选地， 第一斜面与第二斜面的倾斜角度一致。
本发明的另一目的还在于提供一种背光模组， 包括如上所述的膜片定位结 构， 及固定在所述定位结构内的导光板、 背光源， 膜片通过所述膜片定位结构 固定于导光板上。
有益效果： 相较于现有技术， 本发明的定位结构用于膜片的定位， 利用定 位结构中定位框架斜面与滑块斜面的相互挤压， 以及滑块定位凸起与膜片定位 孔的配合可将光学膜片有效固定于背光模组中， 且滑块提供膜片拉应力， 用以 解决膜片在靠近背光源的位置会由于受到来自背光源所散发的热量而产生翘 曲变形的问题， 提升了背光模组的光学品味。
附图说明
图 1为现有技术的膜片受热变形示意图。
图 2为图 1中 A部放大示意图。 图 3为本发明实施例 1的滑块示意图。
图 4为本发明实施例 1的背光模组剖视图。
图 5为本发明实施例 1的背光模组剖视侧视图
图 6为本发明实施例 1滑块与斜面配合将膜片拉紧剖视图。
图 7为本发明实施例 1滑块与斜面配合将膜片拉紧剖视侧视图。
图 8为本发明实施例 2的滑块示意图。
图 9为本发明实施例 2的背光模组剖视图。
图 10为本发明实施例 2的背光模组剖视侧视图。
图 11为本发明实施例 2滑块与斜面配合将膜片拉紧剖视图。
图 12为本发明实施例 2滑块与斜面配合将膜片拉紧剖视侧视图。
图 13为本发明的效果示意图。
具体实施方式 为了更好地阐述本发明的技术特点和结构， 以下结合本发明的实施例及其 附图进行详细描述， 其中， 相同的标号始终表示相同的部件。 实施例 1 请参照图 3至图 7， 本发明的背光模组用于显示装置中， 如图 4所示， 背 光模组 100包括膜片定位结构 200及固定在膜片定位结构 200内的导光板 300、 背光源 (未示出：)。膜片定位结构 200，包括膜片 210、定位框架 220及滑块 250， 其中膜片 210 为光学膜片， 光学膜片的作用是提高液晶显示装置中背光模组 100的光学均一性， 使背光模组 100能产生最佳的光源分布， 提高显像品质。 本实施例中膜片 210的边沿具有至少一凸耳 211，凸耳 211中间设有定位孔 212， 其中定位孔 212为穿孔。 液晶显示装置中， 通常胶框设置于显示面板一侧， 用以定位背光模组与显 示面板， 再利用位于背光模组一侧的背框与胶框结合固定背光模组与显示面 板。 所述的定位框架 220包括背框 230及设于背框 230上的胶框 240， 如图 4 所示， 背框 230包括底板 231及连接于底板的第一侧板 232， 胶框 240包括顶 板 241及连接于顶板 241的第二侧板 244， 第一侧板 232与第二侧板 244连接 使背框 230与胶框 240组装在一起形成容置空间。 本实施例中， 顶板 241的下 表面为与水平面呈一预设角度的第一斜面 242。 从图 4中可见， 膜片 210、 滑块 250及导光板 300置于容置空间内， 其中 滑块 250置于膜片 210与定位框架 200的顶板 241之间。由图 3可知，滑块 250 具有光滑的水平底面 251、 与底面 251相对设置的第二斜面 252， 其中第二斜 面 252与与第一斜面的倾斜角度一致， 图中还可见， 第二斜面 252的斜度向膜 片外沿方向逐渐抬高， 底面 251上还设有定位凸起 253， 较佳地， 如图 5所示， 所述定位凸起 253设于第二斜面 252较高一侧的底面 251边沿且连接至滑块 250的侧壁， 但不应以此为限。 组装时， 首先将背框 230与胶框 240组装在一起， 即将第一侧板 232与第 二侧板 244连接，将滑块 250的定位凸起 253与膜片 210上的定位孔 212配合， 因为定位凸起 253的形状与定位孔 212相适应， 且定位凸起 253的尺寸不大于 定位孔 212的尺寸。 本实施例中， 定位孔为穿孔， 设于光滑底面 251上的定位 凸起 253向下穿过定位孔 212并突出于定位孔 212， 这时底面 251平置于膜片 210上与膜片 210贴合， 而定位凸起 253容置于定位孔 212中， 如图 5所示， 滑块 250还未与胶框 240接触， 即第一斜面 242与第二斜面 252间存在间隙。 然后对胶框 240施加向下的压力， 如图 6和图 7所示， 在胶框 240下压的过程 中，顶板 241的下表面与滑块 250的端面贴合，即第一斜面 242与第二斜面 252 贴合并挤压第二斜面 252， 在斜面的作用下， 胶框 240对滑块 250施加一垂直 于第二斜面 252向下的力， 对该力分解可以知道， 滑块 250受到了一向外的拉 力和一向下的压力。 从图 7中 B区域可看出， 因为滑块 250受到向外的拉力， 从而滑块 250在膜片 210上向外移动， 这时定位凸起 253与定位孔 212接触， 通过定位凸起 253挂起膜片 210上的定位孔 212， 定位凸起 253对膜片 210施 加一向外的拉应力， 从而拉紧膜片 210。 同时， 滑块 250还受到一向下的压力， 将滑块 250紧压在膜片 210上， 防止滑块 250跳脱。 当第一斜面 242与第二斜面 252做适当的调整配合， 就可调整滑块 250的 滑动距离、 滑动方向等， 从而可以调整拉应力的方向以及大小， 将膜片 210拉 伸平整后， 可使用卡勾、 螺丝等方式将胶框 240固定， 即将第一侧板 232与第 二侧板 244固定连接， 图中以螺丝方式固定连接。 可以理解的， 如图 13所示， 相同的膜片定位结构 200可设置在膜片 210 四周， 从而膜片 210四周都受到向外的拉应力， 使膜片 210拉平， 可减少甚至 消除翘曲等变形。 膜片 210 也可以只有一端通过膜片定位结构 200 来固定， 而另一端则通过背光模组机构压合等来固定， 而施力点也可多于两点以上， 依 据具体需求而定。 实施例 2 请参照图 8至图 12， 以下仅描述实施例 2与实施例 1的不同之处。 如图 9 所示， 在实施例 2中， 不同之处在于， 定位框架 220除了包含背框 230及胶框 240， 还包含具有一斜面的插块 243， 所述插块 243设于顶板 241的下表面， 插 块 243的斜面即为第一斜面 242。 其中， 为了更好地控制滑块 250的滑动方向 及滑动距离， 在底板 231上开有定位滑槽 270， 使滑块 250可以向预设轨道滑 动。 为了实现滑块 250可以向预设轨道滑动的目的， 特别地， 如图 8所示， 滑 块 250在底面 251上设有对应的卡合凸块 260， 而定位凸起 253设于第二斜面 252上， 即定位凸起 253与第二斜面 252连接设置， 且邻近于第二斜面 252较 高的一端连接至侧壁。 优选地， 如图 10所示， 卡合凸块 260设于底面中心， 并且卡合凸块 260 由杆部 261和头部 262组成，杆部 261—端与底面 251连接，另一端与头部 262 连接， 杆部 261的直径小于头部 262的直径。 定位滑槽 270包括进口槽 271和 连接于进口槽 271的轨道槽 272， 其中进口槽 271的宽度大于轨道槽 272的宽 度。 相应的， 头部 262的直径与进口槽 271的宽度相适应， 杆部 261的直径与 轨道槽 272的宽度相适应， 并使得轨道槽 272的宽度小于头部 262的直径。 组装时， 如图 9和图 10所示， 与实施例 1不同的是， 滑块 240置于底板
231上并处于膜片 210外侧。 首先将卡合凸块 260的头部 262从定位滑槽 270 的进口槽 271穿过底板并突出于底板， 再向轨道槽 272—端移动， 其中轨道槽 272朝向底板 231边沿设置。 由于轨道槽 272的宽度小于头部 262的直径， 使 得卡合凸块 260卡合于轨道槽 272中，这样滑块 250在滑动过程中卡合凸块 260 不会滑脱定位滑槽 270，这时，滑块 250的底面 251位于底板 231上与底板 231 贴合， 同时使设于第二斜面 252上的定位凸起 253向上穿过定位孔 212并突出 于定位孔 212。 在此要特别说明的是， 为了让第一斜面 242与第二斜面 252更好地配合， 当胶框 240上的插块 243的数量多于一个时， 插块 243在胶框 240顶板 241的 下表面上平行间隔设置， 且相邻插块 243的间距不小于凸耳 211的宽度； 对应 地， 凸耳 211的数量多于一个时， 凸耳 211在膜片 210边沿平行间隔设置， 且 相邻凸耳 211的间距不小于插块 243的厚度。 同样的， 然后对胶框 240施加向下的压力， 如图 11和图 12所示， 在胶框 240下压的过程中， 插块 243穿过相邻凸耳 211的间距与滑块 250配合， 即插 块 243上的第一斜面 242与滑块 250的第二斜面 252贴合挤压， 在斜面的作用 下， 插块 243对滑块 250施加一垂直于第二斜面 252向下的力， 由于卡合凸块 260卡合于定位滑槽 270中，使得滑块 250在底板 231上沿定位滑槽 270滑动。 同理可知， 设于第二斜面 252上向上穿过定位孔 212并突出于定位孔 212的定 位凸起 253对膜片 210施加一向外的拉应力， 从而拉紧膜片 210。 同时， 滑块 250还受到一向下的压力， 将滑块 250的底面 251紧压在底板 231上， 防止滑 块 250跳脱。 综上所述， 本发明的定位结构用于膜片的定位， 利用膜片定位结构中定位 框架斜面与滑块斜面的相互作动， 以及滑块定位凸起与膜片定位孔的配合将光 学膜片有效固定于背光模组中， 且滑块提供膜片拉应力， 用以解决膜片在靠近 背光源的位置会由于受到来自背光源所散发的热量而产生翘曲变形的问题， 提 升了背光模组的光学品味。 虽然本发明是参照其示例性的实施例被具体描述和显示的， 但是本领域的 普通技术人员应该理解， 在不脱离由权利要求限定的本发明的精神和范围的情 况下， 可以对其进行形式和细节的各种改变。

Claims

权利要求书
1、 一种膜片定位结构， 包括膜片及定位框架， 膜片的边沿具有凸耳， 凸 耳中间设有定位孔， 其中， 所述定位框架具有朝向膜片的第一斜面， 第一斜面 与水平面呈一预定角度， 膜片定位结构还包括：
滑块， 位于定位框架和膜片之间， 所述滑块具有与膜片接触的底面、 与第 一斜面对应接触的第二斜面， 第二斜面的斜度向膜片外沿方向逐渐抬高， 滑块 外沿对应所述定位孔设有定位凸起， 定位凸起穿设于空位孔中。
2、 根据权利要求 1所述的膜片定位结构， 其中， 所述定位框架包括胶框 及背框， 胶框设于背框上， 所述第一斜面设于胶框顶板的下表面。
3、 根据权利要求 1所述的膜片定位结构， 其中， 所述第一斜面与第二斜 面的倾斜角度一致。
4、 根据权利要求 2所述的定位结构， 其中， 所述第一斜面与第二斜面的 倾斜角度一致。
5、 一种膜片定位结构， 包括膜片及定位框架， 膜片的边沿具有凸耳， 凸 耳中间设有定位孔， 其中， 所述定位框架朝向膜片的顶板下表面设有具有第一 斜面的插块， 第一斜面与水平面呈一预定角度， 膜片定位结构还包括：
滑块， 位于膜片边沿下方和定位框架之间， 具有与定位框架底板接触的底 面、 与第一斜面对应接触的第二斜面， 第二斜面的斜度向膜片外沿方向逐渐抬 高， 第二斜面上对应于定位孔设有定位凸起， 定位凸起穿设于定位孔中。
6、 根据权利要求 5所述的膜片定位结构， 其中， 所述定位框架包括胶框 及背框， 胶框设于背框上， 所述插块设于胶框顶板的下表面。
7、 根据权利要求 5所述的膜片定位结构， 其中， 所述滑块还具有与底面 连接设置的卡合凸块， 卡合凸块由杆部和头部组成， 杆部一端与底面连接， 一 端与头部连接， 杆部的直径小于头部的直径。
8、 根据权利要求 6所述的膜片定位结构， 其中， 所述滑块还具有与底面 连接设置的卡合凸块， 卡合凸块由杆部和头部组成， 杆部一端与底面连接， 一 端与头部连接， 杆部的直径小于头部的直径。
9、 根据权利要求 7所述的膜片定位结构， 其中， 所述背框底板上对应卡 合凸块开有定位滑槽， 定位滑槽包括进口槽和连接于进口槽的轨道槽， 进口槽 的宽度大于轨道槽的宽度。
10、 根据权利要求 8所述的膜片定位结构， 其中， 所述背框底板上对应卡 合凸块开有定位滑槽， 定位滑槽包括进口槽和连接于进口槽的轨道槽， 进口槽 的宽度大于轨道槽的宽度。
11、 根据权利要求 9所述的膜片定位结构， 其中， 所述卡合凸块的头部直 径大于定位滑槽轨道槽的宽度， 卡合凸块的杆部直径小于定位滑槽轨道槽的宽 菱
12、 根据权利要求 5所述的膜片定位结构， 其中， 所述第一斜面与第二斜 面的倾斜角度一致。
13、 一种背光模组， 其中， 包括膜片定位结构：
膜片定位结构， 包括膜片及定位框架， 膜片的边沿具有凸耳， 凸耳中间设 有定位孔， 其中， 所述定位框架具有朝向膜片的第一斜面， 第一斜面与水平面 呈一预定角度， 定位结构还包括：
滑块， 位于定位框架和膜片之间， 所述滑块具有与膜片接触的底面、 与第 一斜面对应接触的第二斜面， 第二斜面的斜度向膜片外沿方向逐渐抬高， 滑块 外沿对应所述定位孔设有定位凸起， 定位凸起穿设于空位孔中， 以及
固定在所述膜片定位结构内的导光板、 背光源， 膜片通过所述膜片定位结 构固定于导光板上。
14、 根据权利要求 13所述的背光模组， 其中， 定位框架包括胶框及背框， 胶框设于背框上， 所述第一斜面设于胶框顶板的下表面。
15、 根据权利要求 13所述的背光模组， 其中， 所述第一斜面与第二斜面 的倾斜角度一致。
16、 根据权利要求 14所述的背光模组， 其中， 所述第一斜面与第二斜面 的倾斜角度一致。
PCT/CN2013/071332 2013-01-31 2013-02-04 膜片定位结构及其背光模组 Ceased WO2014117401A1 (zh)

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