WO2013189102A1 - 侧入式背光模组 - Google Patents

侧入式背光模组 Download PDF

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Publication number
WO2013189102A1
WO2013189102A1 PCT/CN2012/078258 CN2012078258W WO2013189102A1 WO 2013189102 A1 WO2013189102 A1 WO 2013189102A1 CN 2012078258 W CN2012078258 W CN 2012078258W WO 2013189102 A1 WO2013189102 A1 WO 2013189102A1
Authority
WO
WIPO (PCT)
Prior art keywords
positioning
positioning groove
light guide
guide plate
trapezoidal
Prior art date
Application number
PCT/CN2012/078258
Other languages
English (en)
French (fr)
Inventor
黄建发
Original Assignee
深圳市华星光电技术有限公司
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 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/583,223 priority Critical patent/US8770818B2/en
Publication of WO2013189102A1 publication Critical patent/WO2013189102A1/zh

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0081Mechanical 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
    • G02B6/0086Positioning aspects
    • G02B6/0088Positioning aspects of the light guide or other optical sheets in the package

Definitions

  • the present invention relates to the field of liquid crystal display, and in particular to a side-lit backlight module. Background technique
  • Liquid crystal display has many advantages such as thin body, power saving, and no radiation, and has been widely used.
  • Most of the liquid crystal display devices on the market are backlight type liquid crystal display devices, which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to place liquid crystal molecules in two parallel glass substrates, control the liquid crystal molecules to change direction by energizing or not the glass substrate, and refract the light of the backlight module to produce a picture. Since the liquid crystal panel itself does not emit light, the light source provided by the backlight module needs to be used to display the image normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device.
  • the backlight module is divided into a side-in backlight module and a direct-lit backlight module according to different incident positions of the light source.
  • a light source such as a CCFL (Cold Cathode Fluorescent Lamp) or an LED (Light Emitting Diode) is disposed behind the liquid crystal panel, and a surface light source is directly formed and supplied to the liquid crystal panel.
  • the side-lit backlight module has a backlight LED strip (Light bar) disposed on the edge of the back panel behind the liquid crystal panel, and the light emitted by the LED strip is lighted from the side of the light guide plate (LGP). The surface enters the light guide plate, is reflected and diffused, and is emitted from the light exit surface of the light guide plate, and then is supplied to the liquid crystal panel through the optical film group to form a surface light source.
  • LGP light guide plate
  • the positioning of the light guide plate is very important.
  • the fixing of the light guide plate should meet two requirements, the first is the positioning accuracy; the second is the positioning stability of the light guide plate after considering factors such as tolerance, thermal expansion, moisture absorption and the like.
  • the current fixing method mainly has the following manners: 1.
  • the positioning hole design (shown in FIG. 1) is used, and a plurality of positioning holes 102 are disposed on the mounting side of the light guide plate 100, and are fixed by the positioning studs 304 on the back plate 300. 2.
  • the above positioning methods have failed to solve the problem of expansion of the light guide plate after being heated or absorbed.
  • the light guide plate When the light guide plate is expanded, its size in the width and length directions is increased. Taking a 55" ⁇ light guide plate as an example, when the light guide plate is placed in a 40 ° C incubator from room temperature (25 ° C), its length will increase by 2.8 mm, while the back made of aluminum is used. The expansion length of the plate is 0.68mm and the net expansion value is 2mm. Calculated by a simple mathematical model: If the light guide plate has a zero margin of motion in the longitudinal direction at room temperature (25 °C), the light guide plate cannot be in this direction. Free movement. When the light guide plate expands up to 2mm, it can only bulge upwards (As shown in Figure 2), the height ⁇ of the light guide arch is calculated to be greater than 30 mm.
  • the liquid crystal display panel on the light guide plate in the backlight module will be deformed and broken or peeled off; the optical film group will be severely deformed and form a waving (brightness change). If the light guide plate is upwardly arched by other fixing means, the light guide plate will form a plurality of wave-shaped warps having a low arching height, and the light guide plate is permanently deformed, and the flat state cannot be restored after cooling, and the guide is generated. The brightness of the light board changes. Summary of the invention
  • the present invention provides a side-lit backlight module, including: a backplane, two backlights disposed opposite to the backplane, and a light guide plate disposed between the backlights in the backplane.
  • the light guide plate has two opposite light incident sides, and a first mounting side and a second mounting side disposed opposite to each other between the two light incident sides, wherein the two backlights respectively correspond to the two light incident sides, and the a first positioning hole is disposed on a mounting side, and a first positioning slot and a third positioning slot are respectively disposed on the two sides of the first positioning hole, and the second positioning side is provided with a second positioning hole corresponding to the first positioning hole.
  • the second mounting side is provided with second and fourth positioning slots respectively on the two sides of the second positioning hole
  • the back plate is provided with six studs, which are respectively accommodated in the first and the second positioning holes respectively.
  • the second and fourth positioning grooves are trapezoidal at right angles, and the trapezoidal straight sides are open, and the trapezoidal oblique edges thereof are inclined downward in the direction toward the second positioning holes, and are located in the first, second, third and fourth positioning grooves.
  • the studs are respectively abutted against the oblique sides of the trapezoid.
  • the first mounting side is provided with a first positioning hole at an intermediate position
  • the second mounting side is provided with a second positioning hole corresponding to the first positioning hole at an intermediate position
  • the first and second positioning holes are rectangular with one side open. At room temperature, the studs of the second positioning holes abut against the bottom edges of the second positioning holes, and the studs of the first positioning holes are first The bottom edge of the positioning hole is maintained at a first distance to provide a reserved space for the expansion of the light guide plate in the direction of the first and second positioning holes, the first distance being determined according to a difference in thermal expansion between the light guide plate and the back plate.
  • the stud in the first positioning groove abuts against the top of the trapezoidal oblique side of the first positioning groove, and the stud in the first positioning groove abuts against the trapezoidal top edge of the first positioning groove
  • the stud in the first positioning slot maintains a second distance from the trapezoidal bottom edge of the first positioning slot to provide a reserved space for the expansion of the light guide plate in the direction of the first and third positioning slots, the second The distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate; at room temperature, the riveting in the third positioning groove
  • the column abuts against the top of the trapezoidal oblique side of the third positioning groove, and the stud in the third positioning groove abuts against the trapezoidal top edge of the third positioning groove, and the stud is located in the third positioning groove
  • the trapezoidal bottom edge of the third positioning slot maintains a third distance to provide a reserved space for the expansion of the light guide plate in the direction of the first and third positioning slots, the
  • the stud in the second positioning groove abuts against the top of the trapezoidal oblique side of the second positioning groove, and the stud in the second positioning groove abuts against the trapezoidal bottom edge of the second positioning groove
  • the stud in the second positioning slot maintains a fourth distance from the trapezoidal top edge of the second positioning slot to provide a reserved space for the expansion of the light guide plate in the direction of the second and fourth positioning slots, the fourth The distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate; at room temperature, the stud in the fourth positioning groove is located at the top of the trapezoidal oblique side of the fourth positioning groove, and is located in the fourth positioning groove.
  • the inner stud 4 abuts against the trapezoidal bottom edge of the fourth positioning groove, and the stud in the fourth positioning groove maintains a fifth distance from the trapezoidal top edge of the fourth positioning groove, so that the light guide plate is along the second
  • the expansion in the direction of the fourth positioning groove provides a reserved space, which is determined according to the difference in thermal expansion between the light guide plate and the back plate.
  • the sixth distance provides a reserved space for the expansion of the light guide plate along the first and second positioning grooves
  • the length of the trapezoidal bottom side of the third positioning groove minus the length of the trapezoidal top side of the third positioning groove is subtracted by one
  • the seven distances are equal to the length of the trapezoidal bottom edge of the fourth positioning groove minus the length of the trapezoidal top side of the fourth positioning groove, and the seventh distance provides a reserved space for the expansion of the light guide plate in the direction of the third and fourth positioning grooves.
  • the present invention also provides a side-lit backlight module, comprising: a backplane, two backlights disposed opposite to the backplane, and a light guide panel disposed in the backplane between the two backlights, the light guide panel having Two opposite light incident sides, and a first mounting side and a second mounting side disposed between the two light incident sides, the two backlights respectively corresponding to the two light entering sides, wherein the first mounting side is disposed a first positioning hole is disposed on the two sides of the first positioning hole, and a second positioning hole is disposed on the two sides of the first positioning hole, and the second positioning side is provided with a second positioning hole corresponding to the first positioning hole, the second installation
  • the first and third positioning slots are respectively disposed on the two sides of the second positioning hole, and the second and fourth positioning slots are respectively disposed on the second positioning hole, and the back plate is provided with six studs respectively received in the first and second positioning holes.
  • first, second, third, and fourth positioning slots thereby positioning the light guide plate, wherein the first and third positioning slots are trapezoidal at right angles, the trapezoid straight edge is open, and the trapezoidal oblique edge is oriented
  • the direction of the first positioning hole is inclined downward
  • the positioning groove has a trapezoidal shape with a trapezoidal straight edge, and the trapezoidal oblique edge thereof is inclined downward toward the second positioning hole, and the studs located in the first, second, third and fourth positioning grooves respectively abut On the oblique side of the trapezoid;
  • the first mounting side is provided with a first positioning hole at an intermediate position
  • the second mounting side is provided with a second positioning hole corresponding to the first positioning hole at an intermediate position
  • the first and second positioning holes are rectangular with one side open.
  • the studs of the second positioning holes abut against the bottom edges of the second positioning holes, and the studs of the first positioning holes are
  • the bottom edge of the first positioning hole is maintained at a first distance to provide a reserved space for the expansion of the light guide plate in the direction of the first and second positioning holes, the first distance being determined according to a difference in thermal expansion between the light guide plate and the back plate;
  • the stud in the first positioning groove abuts against the top of the trapezoidal oblique side of the first positioning groove, and the stud in the first positioning groove abuts against the first positioning groove trapezoid a top end, the stud in the first positioning groove is maintained at a second distance from the trapezoidal bottom edge of the first positioning groove, to provide a space for the expansion of the light guide plate in the direction of the first and third positioning grooves, The second distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate; at room temperature, the stud in the third positioning groove abuts against the top of the trapezoidal oblique side of the third positioning groove, and is located in the third positioning groove The inner stud is abutted against the trapezoidal top edge of the third positioning groove, and the stud in the third positioning groove maintains a third distance from the trapezoidal bottom edge of the third positioning groove, so that the light guide plate is along the first The expansion in the direction of the third positioning groove
  • the stud in the second positioning groove abuts against the top of the trapezoidal oblique side of the second positioning groove, and the stud in the second positioning groove abuts against the second positioning groove trapezoid a bottom end, the stud in the second positioning groove and the trapezoidal top edge of the second positioning groove maintain a fourth distance to provide a space for the expansion of the light guide plate in the direction of the second and fourth positioning grooves,
  • the fourth distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate; at room temperature, the stud in the fourth positioning groove is located at the top of the trapezoidal oblique side of the fourth positioning groove, and is located at the fourth The stud in the positioning groove abuts against the trapezoidal bottom edge of the fourth positioning groove, and the stud in the fourth positioning groove maintains a fifth distance from the trapezoidal top edge of the fourth positioning groove, so that the light guide plate is along the first The expansion in the direction of the second and fourth positioning grooves provides
  • the length of the trapezoidal bottom edge of the first positioning slot is subtracted from the length of the trapezoidal top side of the first positioning slot, and a sixth distance is subtracted from the length of the trapezoidal bottom edge of the second positioning slot minus the trapezoidal top of the second positioning slot.
  • the sixth distance provides a reserved space for the expansion of the light guide plate in the direction of the first and second positioning grooves; the length of the trapezoidal bottom side of the third positioning groove minus the length of the trapezoidal top side of the third positioning groove is subtracted A seventh distance is equal to the length of the trapezoidal bottom edge of the fourth positioning groove minus the length of the trapezoidal top side of the fourth positioning groove, and the seventh distance provides a reserved space for the expansion of the light guide plate in the direction of the third and fourth positioning grooves.
  • the present invention also provides a side-lit backlight module, comprising: a backplane, a backlight disposed in the backplane, and a light guide plate disposed in the backplane, wherein the light guide panel has a light entrance side, and The first mounting side and the second mounting side are oppositely disposed on the light-incident side, the backlight is disposed on the light-input side, and the first mounting side is provided with a first positioning hole and two first positioning slots.
  • the second mounting side is provided with a second positioning hole corresponding to the first positioning hole, and the second mounting side is respectively provided with two second positioning slots corresponding to the first positioning slot, and the back plate is provided with six studs.
  • the light guide plate is respectively disposed in the first and second positioning holes, and the first and second positioning grooves, wherein the first positioning groove has a trapezoidal straight angle, and the trapezoidal straight edge is open, and the trapezoidal oblique edge thereof
  • the second positioning groove is inclined downward in a direction toward the first positioning hole, the trapezoidal straight side is open, and the trapezoidal oblique side is inclined downward in a direction toward the second positioning hole, and is located at the first and second positioning positions.
  • the studs in the slots abut against the beveled sides of the trapezoid.
  • a first positioning hole is disposed on the first mounting side near the light-incident side, and a first positioning slot is disposed at an end position of the first mounting side and the end position away from the first positioning hole, and the second mounting side corresponds to the first positioning.
  • a second positioning hole is disposed on the hole adjacent to the light-incident side, and the second mounting side is respectively provided with a second positioning groove corresponding to the first positioning groove at an intermediate position and an end position away from the second positioning hole.
  • the first and second positioning holes are rectangular with one side open. At room temperature, the studs of the second positioning holes abut against the bottom edges of the second positioning holes, and the studs of the first positioning holes are first The bottom edge of the positioning hole is maintained at a first distance to provide a reserved space for the expansion of the light guide plate in the direction of the first and second positioning holes, and the first distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate. The studs of the second positioning holes abut against the two sides of the first and second positioning holes, respectively.
  • the stud in the first positioning groove abuts against the top of the trapezoidal oblique side of the first positioning groove, and the stud in the first positioning groove abuts against the trapezoidal top edge of the first positioning groove
  • the stud in the first positioning slot maintains a second distance from the trapezoidal bottom edge of the first positioning slot to provide a reserved space for the expansion of the light guide plate in the direction of the first positioning slot, the second distance according to the guide The difference between the thermal expansion of the light plate and the back plate is determined.
  • the stud in the second positioning groove abuts against the top of the trapezoidal oblique side of the second positioning groove, and the stud in the second positioning groove abuts.
  • the stud in the second positioning groove maintains a third distance from the trapezoidal top edge of the second positioning groove, so as to expand the light guide plate in the direction of the second positioning groove.
  • the third distance is determined according to a difference in thermal expansion between the light guide plate and the back plate, and the length of the trapezoidal bottom edge of the first positioning groove minus the length of the trapezoidal top side of the first positioning groove is subtracted by a fourth distance equal to The trapezoidal bottom edge of the second positioning groove Substituting the length of the trapezoidal top side of the second positioning groove, the fourth distance providing a reserved space for the expansion of the light guide plate in the direction of the first and second positioning grooves, the fourth distance being thermally expanded according to the light guide plate and the back plate The difference is fixed.
  • the side-entry backlight module of the invention adopts the trapezoidal positioning groove to ensure that the light guide plate and the stud column are always in close contact with each other, thereby avoiding excessive free movable space of the light guide plate and effectively positioning the light guide plate. At the same time, the condition that the light guide plate is expanded and warped is avoided.
  • FIG. 1 is a schematic view showing a fixing structure of a light guide plate of a side-entry backlight module in the prior art
  • FIG. 2 is a schematic view showing expansion warpage of a light guide plate in the prior art
  • FIG. 3 is a schematic structural view of an embodiment of a side-lit backlight module of the present invention.
  • FIG. 4 is a schematic structural view of another embodiment of a side-lit backlight module of the present invention. detailed description
  • the present invention provides a side-lit backlight module, which is a double-sided backlight module, and includes: a back plate 2 and two backlights disposed opposite to the back plate 2 And a light guide plate 6 disposed in the back plate 2 and located between the two backlights 4.
  • the light guide plate 6 has two opposite light incident sides 60 and a first mounting side 62 and a second mounting side 64 between the two light incident sides 60.
  • the two backlights 4 respectively correspond to the two light sources.
  • Light side 60 is set.
  • the first mounting side 62 is placed upwardly and the second mounting side 64 is placed facing down.
  • the first mounting side 62 is provided with a first positioning hole 622 at an intermediate position, and a first positioning groove 624 and a second positioning groove 626 are respectively disposed on two sides of the first positioning hole 622.
  • the second mounting side 64 is provided with a second positioning hole 642 corresponding to the first positioning hole 622.
  • the second mounting side 64 corresponds to the first and second positioning slots 624 and 626 respectively on the two sides of the second positioning hole.
  • Third and fourth positioning grooves 644, 646 are provided.
  • the back plate 2 is provided with six studs 22 respectively received in the first and second positioning holes 622, 642 and the first, second, third and fourth positioning grooves 624, 644, 626, 646. Thereby, the light guide plate 6 is positioned.
  • the first and second positioning holes 622 and 642 have a rectangular shape with one side open. At room temperature (25 ° C), the stud 22 located in the second positioning hole 642 and the bottom edge of the second positioning hole 642 are close to each other.
  • the rivet 22 at the first positioning hole 622 maintains a first distance from the bottom edge of the first positioning hole 622 to provide a pre-expansion of the light guide plate 6 in the direction of the first and second positioning holes 622, 642. Leave space.
  • the first distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size, material, RA (reliability analysis) test condition of the light guide plate, and the back plate material, so as to use the PMMA material.
  • the 55" light guide plate and the aluminum back plate are 1 mm.
  • the first and second positioning holes 622, 642 are respectively provided on the two sides of the first and second positioning holes 622, 642 and the first and second positioning holes 622, 642. The side is against.
  • the first positioning groove 624 has a trapezoidal shape with a trapezoidal straight edge, and the trapezoidal oblique edge thereof is inclined downward toward the first positioning hole 622, and is located in the first positioning groove 624 at room temperature (25 ° C).
  • the studs 22 are located at the top of the trapezoidal bevel of the first positioning groove 624, and the studs 22 located in the first positioning groove 624 are disposed on the trapezoidal top edge of the first positioning groove 624.
  • the stud 22 located in the first positioning slot 624 is maintained at a second distance from the trapezoidal bottom edge of the first positioning slot 624 to provide a pre-expansion of the light guide plate 6 in the direction of the first and second positioning slots 624, 626. Leave space.
  • the second distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size of the light guide plate, the material, the RA test condition, and the back plate material, and the 55" light guide plate and the aluminum material are used for the material.
  • the back plate has a second distance of 2 mm.
  • the third positioning groove 626 has a trapezoidal shape with a trapezoidal straight edge, and the trapezoidal oblique edge thereof is inclined downward toward the first positioning hole 622, and is located in the third positioning groove 626 at room temperature (25 ° C).
  • the studs 22 are located at the top of the trapezoidal bevel of the third positioning groove 626, and the studs 22 located in the third positioning groove 626 are disposed on the trapezoidal top edge of the third positioning groove 626.
  • the stud 22 located in the third positioning groove 626 maintains a third distance from the trapezoidal bottom edge of the third positioning groove 626 to provide a pre-expansion of the light guide plate 6 in the direction of the first and third positioning grooves 624, 626. Leave space.
  • the third distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size of the light guide plate, the material, the RA test condition, and the back plate material, and the 55" light guide plate and the aluminum material are used for the material.
  • the back plate has a third distance of 2 mm.
  • the second positioning groove 644 has a trapezoidal shape with a trapezoidal straight edge and a trapezoidal oblique edge thereof inclined downward toward the second positioning hole 642.
  • the second positioning groove 644 is located at room temperature (25 ° C).
  • the studs 22 are disposed on the top of the trapezoidal bevel of the second positioning groove 644, and the studs 22 located in the second positioning groove 644 are disposed on the trapezoidal bottom edge of the second positioning groove 644.
  • the stud 22 located in the second positioning groove 644 maintains a fourth distance from the trapezoidal top edge of the second positioning groove 644 to provide a pre-expansion of the light guide plate 6 in the direction of the second and fourth positioning grooves 644, 646. Leave space.
  • the fourth distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size of the light guide plate, the material, the RA test condition, and the back plate material, and the 55" light guide plate and the aluminum material are used for the material.
  • the back plate has a fourth distance of 2 mm.
  • the fourth positioning groove 646 has a trapezoidal shape with a trapezoidal straight edge, and the trapezoidal oblique edge thereof is inclined downward toward the second positioning hole 642, and is located at the fourth position at room temperature (25 ° C).
  • the studs 22 in the slot 646 are disposed on the top of the trapezoidal bevel of the fourth positioning slot 646, and the studs 22 in the fourth positioning slot 646 are disposed on the trapezoidal bottom of the fourth positioning slot 646. .
  • the stud 22 located in the fourth positioning groove 646 maintains a fifth distance from the trapezoidal top edge of the fourth positioning groove 646 to provide a pre-expansion of the light guide plate 6 in the direction of the second and fourth positioning grooves 644, 646. Leave space.
  • the fifth distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size, material, RA test condition, and back plate material of the light guide plate, and the 55" light guide plate and aluminum material of the PMMA material are used.
  • the back plate has a fifth distance of 2 mm.
  • the trapezoidal top edge of the first positioning slot 624 is the same as the trapezoidal top edge of the second positioning slot 644.
  • the trapezoidal straight side of the first positioning slot 624 is the same as the trapezoid straight side of the second positioning slot 644.
  • the first positioning slot 624 is The length of the trapezoidal bottom edge is a sixth distance longer than the trapezoidal bottom edge of the second positioning groove 644 to provide a reserved space for the expansion of the light guide plate in the direction of the first and second positioning grooves 624, 644.
  • the sixth distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size, material, RA test condition, and back plate material of the light guide plate, and the 55" light guide plate and aluminum material of the PMMA material are used.
  • the sixth distance is 1 mm.
  • the first positioning slot 624 The length of the trapezoid base minus the length of the trapezoidal top side of the first positioning groove 624 is subtracted from the sixth distance equal to the length of the trapezoidal bottom side of the second positioning groove 644 minus the length of the trapezoidal top side of the second positioning groove 644.
  • the trapezoidal top edge of the third positioning slot 626 is the same as the trapezoidal top edge of the fourth positioning slot 646, and the trapezoidal straight side of the third positioning slot 626 is the same as the trapezoid straight side of the fourth positioning slot 646.
  • the length of the trapezoidal bottom edge of the groove 626 is a seventh distance longer than the trapezoidal bottom side of the fourth positioning groove 646 to provide a space for the expansion of the light guide plate in the direction of the third and fourth positioning grooves 626, 646.
  • the seventh distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size, material, RA test condition, and back plate material of the light guide plate, and the 55" light guide plate and aluminum material of the PMMA material are used.
  • the seventh distance is 1 mm.
  • the third positioning groove 626 The length of the trapezoid bottom edge minus the trapezoidal top side length of the third positioning groove 626 is subtracted from the seventh distance equal to the trapezoidal bottom side length of the fourth positioning groove 646 minus the trapezoidal top side length of the fourth positioning groove 646.
  • the number of positioning slots can be adjusted according to the size of the light guide plate or other requirements.
  • the positioning positioning manner of the positioning hole and the positioning groove and the stud column of the present invention can be extended in two perpendicular directions when the light guide plate is expanded, so as to prevent the warpage of the light guide plate when the position of the light guide plate is fixed. Due to the different sizes of the side-lit backlight modules, the size of the light guide plate is different, and the length of the light guide plate is different. Therefore, the fixing plate is only required to fix the positioning hole, the positioning groove and the stud according to the above fixing manner. The size and position can be changed accordingly to ensure that the light guide plate is placed in a 40 °C incubator for long-term operation without warping deformation. If some products need to work at higher temperatures, then only need to reserve more expansion space for the light guide plate to avoid deformation of the light guide plate.
  • the side-entry backlight module of the embodiment is a single-side light-emitting backlight module, and includes: a backboard 2
  • the backlight 4 disposed in the back panel 2 and the corresponding backlight 4 are disposed on the light guide plate 7 in the back panel 2.
  • the light guide plate 7 has a light incident side 70 and a first mounting side 72 and a second mounting side 74 disposed opposite to each other on the light incident side 70.
  • the backlight 4 is disposed corresponding to the light incident side 70.
  • the first mounting side 72 is placed upward and the second mounting side 74 is placed downward.
  • the first mounting side 72 is provided with a first positioning hole 722 near the light-incident side 70, and a first positioning groove 724 is respectively disposed at a position between the intermediate portion and the end portion away from the first positioning hole 722.
  • a second positioning hole 742 is disposed on the second mounting side 74 corresponding to the first positioning hole 722 , and the second mounting side 74 corresponds to the first positioning slot 724 at an intermediate position and away from the second positioning hole 742 .
  • the end positions are respectively provided with second positioning grooves 744.
  • the back plate 2 is provided with six studs 22 respectively received in the first and second positioning holes 722, 742 and the first and second positioning grooves 724, 744 to position the light guide plate 7 .
  • the first and second positioning holes 722, 742 have a rectangular shape with one side open. At room temperature (25 ° C), the stud 22 located in the second positioning hole 742 and the bottom edge of the second positioning hole 742 are close to each other. The stud 22 at the first positioning hole 722 maintains a first distance from the bottom edge of the first positioning hole 722 to provide a space for the expansion of the light guide plate 7 in the direction of the first and second positioning holes 722, 742.
  • the first distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size, material, RA test condition, and back plate material of the light guide plate, and the 55" light guide plate and aluminum material of the PMMA material are used. For example, the first distance is 1 mm.
  • the rivets 22 at the first and second positioning holes 722, 742 abut against the two sides of the first and second positioning holes 722, 742, respectively.
  • the first positioning slot 724 has a trapezoidal shape with a trapezoidal straight edge, and the trapezoidal oblique edge thereof is inclined downward toward the first positioning hole 722, and is located in the first positioning slot 724 at room temperature (25 ° C).
  • the studs 22 are located at the top of the trapezoidal bevel of the first positioning groove 724, and the studs 22 located in the first positioning groove 724 are disposed on the trapezoidal top edge of the first positioning groove 724.
  • the stud 22 located in the first positioning groove 724 and the trapezoidal bottom edge of the first positioning groove 724 are maintained. The two distances provide a reserved space for the expansion of the light guide plate 7 in the direction of the first positioning groove 724.
  • the second distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size, material, RA test condition, and back plate material of the light guide plate, and the 55" light guide plate and aluminum material of the PMMA material are used.
  • the back plate has a second distance of 2 mm.
  • the second positioning groove 744 has a trapezoidal shape with a trapezoidal straight edge, and the trapezoidal oblique edge thereof is inclined downward toward the second positioning hole 742, and is located in the second positioning groove 744 at room temperature (25 ° C).
  • the studs 22 are located at the top of the trapezoidal bevel of the second positioning groove 744, and the studs 22 located in the second positioning groove 744 are disposed on the trapezoidal bottom edge of the second positioning groove 744.
  • the rivet 22 in the second positioning groove 744 maintains a third distance from the trapezoidal top edge of the second positioning groove 744 to provide a space for the expansion of the light guide plate 7 in the direction of the second positioning groove 744.
  • the third distance is determined by the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size of the light guide plate, the material, the RA test condition, and the back plate material, and the 55" light guide plate and the aluminum material are used for the material.
  • the back plate has a third distance of 2 mm.
  • the trapezoidal top edge of the first positioning slot 724 is the same as the trapezoidal top edge of the second positioning slot 744.
  • the trapezoidal straight side of the first positioning slot 724 is the same as the trapezoid straight side of the second positioning slot 744, and the first positioning slot 724 is The length of the trapezoidal bottom edge is a fourth distance longer than the trapezoidal bottom edge of the second positioning groove 744 to provide a space for the expansion of the light guide plate in the direction of the first and second positioning grooves 724, 744.
  • the fourth distance is determined according to the difference between the thermal expansion of the light guide plate and the back plate, specifically, the size, material, RA test condition, and back plate material of the light guide plate, and the 55" light guide plate and aluminum material of the PMMA material are used.
  • the fourth distance is 1 mm.
  • the first positioning slot 724 The length of the trapezoidal bottom edge minus the length of the trapezoidal top side of the first positioning groove 724 is subtracted from the fourth distance equal to the length of the trapezoidal bottom side of the second positioning groove 744 minus the length of the trapezoidal top side of the second positioning groove 744.
  • the number of positioning slots can be adjusted according to the size of the light guide plate or other requirements.
  • the positioning positioning manner of the positioning hole and the positioning groove and the stud column of the present invention can be extended in two perpendicular directions when the light guide plate is expanded, so as to prevent the warpage of the light guide plate, when the position of the light guide plate is fixed.
  • the fixing plate is only required to fix the positioning hole, the positioning groove and the stud according to the above fixing manner.
  • the size and position can be changed accordingly to ensure that the light guide plate is placed in a 40 °C incubator for long-term operation without warping deformation. If some products need to work at higher temperatures, simply leave more room for expansion on the light guide to avoid guidance. The deformation problem of the light board.
  • the side-entry backlight module of the present invention has a trapezoidal positioning groove, so that the light guide plate and the stud column are always in close contact with each other, thereby avoiding excessive free movement space of the light guide plate and effectively positioning the light guide plate. The situation in which the light guide plate is expanded and warped is avoided.

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Abstract

一种侧入式背光模组,包括导光板(6),具有相对设置的第一安装侧(62)与第二安装侧(64)。第一安装侧(62)设有第一定位孔(622)、第一定位槽(624)与第二定位槽(626)。第二安装侧(64)对应设有第二定位孔(642)、第三与第四定位槽(644,646)。背板(2)上设有六个铆柱(22),其分别容纳于第一与第二定位孔(622,642)、及第一、第二、第三与第四定位槽(624,626,644,646)内。第一与第二定位槽(624,626)呈直角梯形,其梯形直边开口,且其梯形斜边沿朝向第一定位孔(622)的方向向下倾斜;第三及第四定位槽(644,646)呈直角梯形,其梯形直边开口,且其梯形斜边沿朝向第二定位孔(642)的方向向下倾斜;位于第一、第二、第三与第四定位槽(624,626,644,646)内的铆柱(22)分别抵靠在梯形的斜边上。该背光模组通过梯形定位槽的设置,使得导光板与铆柱之间始终紧密接触,有效定位了导光板,同时避免了导光板膨胀而翘曲的发生。

Description

侧入式背光模组 技术领域
本发明涉及液晶显示领域, 尤其涉及一种侧入式背光模组。 背景技术
液晶显示装置(LCD, Liquid Crystal Display )具有机身薄、 省电、 无 辐射等众多优点, 得到了广泛的应用。 现有市场上的液晶显示装置大部分 为背光型液晶显示装置, 其包括液晶面板及背光模组 ( backlight module ) 。 液晶面板的工作原理是在两片平行的玻璃基板当中放置液晶分 子, 通过玻璃基板通电与否来控制液晶分子改变方向, 将背光模组的光线 折射出来产生画面。 由于液晶面板本身不发光, 需要借由背光模组提供的 光源来正常显示影像, 因此, 背光模组成为液晶显示装置的关键组件之 一。 背光模组依照光源入射位置的不同分成侧入式背光模组与直下式背光 模组两种。 直下式背光模组是将发光光源例如 CCFL(Cold Cathode Fluorescent Lamp, 阴极萤光灯管)或 LED(Light Emitting Diode, 发光二极 管)设置在液晶面板后方, 直接形成面光源提供给液晶面板。 而侧入式背光 模组是将背光源 LED灯条(Light bar )设于液晶面板侧后方的背板边缘, LED灯条发出的光线从导光板(LGP, Light Guide Plate )一侧的入光面进 入导光板, 经反射和扩散后从导光板出光面射出, 再经由光学膜片组以形 成面光源提供给液晶面板。
在侧入式背光模组中, 导光板的定位非常重要。 通常导光板的固定应 满足两个要求, 第一为定位精度; 第二为考虑公差、 热膨胀、 吸潮等因素 之后的导光板定位稳定性。 当前的固定方法主要有如下方式: 1、 釆用定 位孔设计 (如图 1 所示) , 在导光板 100的安装侧设置若干定位孔 102, 通过由背板 300 上的定位铆柱 304 固定。 2、 使用四角的 "L" 型橡胶 ( rubber ) 定位。 但以上定位方式均未能^ ί艮好的解决导光板在受热或者吸 潮后的膨胀问题。 当导光板膨胀后, 其在宽度和长度方向的尺寸均会有所 增加。 以 55" 的 ΡΜΜΑ材质的导光板为例, 当导光板从室温(25 °C )放 入 40°C的温箱内工作时, 其长度会增加 2.8mm, 而釆用铝材制成的背板的 膨胀长度为 0.68mm, 膨胀净值为 2mm。 以一个简单的数学模型进行计 算: 若在室温时 (25 °C )导光板在长度方向的活动裕度为零, 即在该方向 导光板无法自由活动。 当导光板膨胀达 2mm后, 其只能向上表面拱起 (如图 2所示) , 经计算导光板拱起的高度 Η大于 30mm。 如此大的形变 量会带来以下问题, 第一、 背光模组中处于导光板上面的液晶显示面板将 会变形破裂或者脱落; 光学膜片组将会严重变形并形成 waving (亮度明暗 变化) 。 若通过其他固定方式限制导光板向上拱起, 则导光板将形成多个 拱起高度较低的波浪形的翘曲, 并造成导光板永久变形, 在冷却后也无法 恢复平直状态, 产生导光板上亮度明暗变化。 发明内容
本发明的目的在于提供一种侧入式背光模组, 其导光板在受热与吸潮 膨长后仍不会翘曲, 确保背光模组在高温、 潮湿环境下可以正常工作。
为实现上述目的, 本发明提供一种侧入式背光模组, 包括: 背板、 两 相对设置于背板内的背光源及设于背板内且位于两背光源之间的导光板, 所述导光板具有两相对的入光侧、 及位于两入光侧之间且相对设置的第一 安装侧与第二安装侧, 所述两背光源分别对应该两入光侧设置, 所述第一 安装侧设有第一定位孔, 且在第一定位孔两侧分别设有第一定位槽与第三 定位槽, 所述第二安装侧对应第一定位孔设有第二定位孔, 所述第二安装 侧对应第一与第三定位槽在第二定位孔两侧分别设有第二与第四定位槽, 所述背板上设有六个铆柱, 其分别容纳于第一与第二定位孔、 及第一、 第 二、 第三与第四定位槽内, 从而对该导光板进行定位, 所述第一与第三定 位槽呈直角梯形, 其梯形直边开口, 且其梯形斜边沿朝向第一定位孔的方 向向下倾斜, 所述第二及第四定位槽呈直角梯形, 其梯形直边开口, 且其 梯形斜边沿朝向第二定位孔的方向向下倾斜, 位于第一、 第二、 第三与第 四定位槽内的铆柱分别抵靠在梯形的斜边上。
所述第一安装侧于中间位置设有第一定位孔, 所述第二安装侧对应第 —定位孔于中间位置设有第二定位孔。
所述第一与第二定位孔呈一边开口的矩形, 在室温时, 位于第二定位 孔的铆柱与第二定位孔的底边相抵靠, 而位于第一定位孔的铆柱与第一定 位孔的底边保持一第一距离以为导光板沿第一与第二定位孔方向上的膨胀 提供预留空间, 该第一距离根据导光板与背板受热膨胀的差异来定。
在室温时, 位于第一定位槽内的铆柱抵靠于所述第一定位槽梯形斜边 的顶部, 且位于第一定位槽内的铆柱抵靠于所述第一定位槽梯形顶边, 该 位于第一定位槽内的铆柱与所述第一定位槽梯形底边保持一第二距离, 以 为导光板沿第一与第三定位槽方向上的膨胀提供预留空间, 该第二距离根 据导光板与背板受热膨胀的差异来定; 在室温时, 位于第三定位槽内的铆 柱抵靠于所述第三定位槽梯形斜边的顶部, 且位于第三定位槽内的铆柱抵 靠于所述第三定位槽梯形顶边, 该位于第三定位槽内的铆柱与所述第三定 位槽梯形底边保持一第三距离, 以为导光板沿第一与第三定位槽方向上的 膨胀提供预留空间, 该第三距离根据导光板与背板受热膨胀的差异来定。
在室温时, 位于第二定位槽内的铆柱抵靠于所述第二定位槽梯形斜边 的顶部, 且位于第二定位槽内的铆柱抵靠于所述第二定位槽梯形底边, 该 位于第二定位槽内的铆柱与所述第二定位槽梯形顶边保持一第四距离, 以 为导光板沿第二与第四定位槽方向上的膨胀提供预留空间, 该第四距离根 据导光板与背板受热膨胀的差异来定; 在室温时, 位于第四定位槽内的铆 柱 ·ί氏靠于所述第四定位槽梯形斜边的顶部, 且位于第四定位槽内的铆柱 4氐 靠于所述第四定位槽梯形底边, 该位于第四定位槽内的铆柱与所述第四定 位槽梯形顶边保持一第五距离, 以为导光板沿第二与第四定位槽方向上的 膨胀提供预留空间, 该第五距离根据导光板与背板受热膨胀的差异来定。
所述第一定位槽的梯形底边长度减去第一定位槽的梯形顶边长度后减 去一第六距离等于第二定位槽的梯形底边长度减去第二定位槽的梯形顶边 长度, 该第六距离为导光板沿第一与第二定位槽方向上的膨胀提供预留空 间; 第三定位槽的梯形底边长度减去第三定位槽的梯形顶边长度后减去一 第七距离等于第四定位槽的梯形底边长度减去第四定位槽的梯形顶边长 度, 第七距离为导光板沿第三与第四定位槽方向上的膨胀提供预留空间。
本发明还提供一种侧入式背光模组, 包括: 背板、 两相对设置于背板 内的背光源及设于背板内且位于两背光源之间的导光板, 所述导光板具有 两相对的入光侧、 及位于两入光侧之间且相对设置的第一安装侧与第二安 装侧, 所述两背光源分别对应该两入光侧设置, 所述第一安装侧设有第一 定位孔, 且在第一定位孔两侧分别设有第一定位槽与第三定位槽, 所述第 二安装侧对应第一定位孔设有第二定位孔, 所述第二安装侧对应第一与第 三定位槽在第二定位孔两侧分别设有第二与第四定位槽, 所述背板上设有 六个铆柱, 其分别容纳于第一与第二定位孔、 及第一、 第二、 第三与第四 定位槽内, 从而对该导光板进行定位, 所述第一与第三定位槽呈直角梯 形, 其梯形直边开口, 且其梯形斜边沿朝向第一定位孔的方向向下倾斜, 所述第二及第四定位槽呈直角梯形, 其梯形直边开口, 且其梯形斜边沿朝 向第二定位孔的方向向下倾斜, 位于第一、 第二、 第三与第四定位槽内的 铆柱分别抵靠在梯形的斜边上;
其中, 所述第一安装侧于中间位置设有第一定位孔, 所述第二安装侧 对应第一定位孔于中间位置设有第二定位孔; 其中, 所述第一与第二定位孔呈一边开口的矩形, 在室温时, 位于第 二定位孔的铆柱与第二定位孔的底边相抵靠, 而位于第一定位孔的铆柱与 第一定位孔的底边保持一第一距离以为导光板沿第一与第二定位孔方向上 的膨胀提供预留空间, 该第一距离根据导光板与背板受热膨胀的差异来 定;
其中, 在室温时, 位于第一定位槽内的铆柱抵靠于所述第一定位槽梯 形斜边的顶部, 且位于第一定位槽内的铆柱抵靠于所述第一定位槽梯形顶 边, 该位于第一定位槽内的铆柱与所述第一定位槽梯形底边保持一第二距 离, 以为导光板沿第一与第三定位槽方向上的膨胀提供预留空间, 该第二 距离根据导光板与背板受热膨胀的差异来定; 在室温时, 位于第三定位槽 内的铆柱抵靠于所述第三定位槽梯形斜边的顶部, 且位于第三定位槽内的 铆柱抵靠于所述第三定位槽梯形顶边, 该位于第三定位槽内的铆柱与所述 第三定位槽梯形底边保持一第三距离, 以为导光板沿第一与第三定位槽方 向上的膨胀提供预留空间, 该第三距离根据导光板与背板受热膨胀的差异 来定;
其中, 在室温时, 位于第二定位槽内的铆柱抵靠于所述第二定位槽梯 形斜边的顶部, 且位于第二定位槽内的铆柱抵靠于所述第二定位槽梯形底 边, 该位于第二定位槽内的铆柱与所述第二定位槽梯形顶边保持一第四距 离, 以为导光板沿第二与第四定位槽方向上的膨胀提供预留空间, 该第四 距离根据导光板与背板受热膨胀的差异来定; 在室温时, 位于第四定位槽 内的铆柱 ·ί氐靠于所述第四定位槽梯形斜边的顶部, 且位于第四定位槽内的 铆柱抵靠于所述第四定位槽梯形底边, 该位于第四定位槽内的铆柱与所述 第四定位槽梯形顶边保持一第五距离, 以为导光板沿第二与第四定位槽方 向上的膨胀提供预留空间, 该第五距离根据导光板与背板受热膨胀的差异 来定;
其中, 所述第一定位槽的梯形底边长度减去第一定位槽的梯形顶边长 度后减去一第六距离等于第二定位槽的梯形底边长度减去第二定位槽的梯 形顶边长度, 该第六距离为导光板沿第一与第二定位槽方向上的膨胀提供 预留空间; 第三定位槽的梯形底边长度减去第三定位槽的梯形顶边长度后 减去一第七距离等于第四定位槽的梯形底边长度减去第四定位槽的梯形顶 边长度, 第七距离为导光板沿第三与第四定位槽方向上的膨胀提供预留空 间。
本发明还提供一种侧入式背光模组, 包括: 背板、 设置于背板内的背 光源及对应背光源设置于背板内的导光板, 所述导光板具有一入光侧、 及 相对设置且位于入光侧两端的第一安装侧与第二安装侧, 所述背光源对应 该入光侧设置, 所述第一安装侧设有一第一定位孔及两第一定位槽, 所述 第二安装侧对应第一定位孔设有第二定位孔, 所述第二安装侧对应第一定 位槽分别设有两第二定位槽, 所述背板上设有六个铆柱, 其分别容纳于第 一与第二定位孔、 及第一与第二定位槽内, 从而对该导光板进行定位, 所 述第一定位槽呈直角梯形, 其梯形直边开口, 且其梯形斜边沿朝向第一定 位孔的方向向下倾斜, 所述第二定位槽呈直角梯形, 其梯形直边开口, 且 其梯形斜边沿朝向第二定位孔的方向向下倾斜, 位于第一与第二定位槽内 的铆柱分别抵靠在梯形的斜边上。
所述第一安装侧靠近入光侧设有第一定位孔, 且在其中间位置与远离 第一定位孔的端部位置分别设有第一定位槽, 所述第二安装侧对应第一定 位孔于靠近入光侧设有第二定位孔, 所述第二安装侧对应第一定位槽在中 间位置与远离第二定位孔的端部位置分别设有第二定位槽。
所述第一与第二定位孔呈一边开口的矩形, 在室温时, 位于第二定位 孔的铆柱与第二定位孔的底边相抵靠, 而位于第一定位孔的铆柱与第一定 位孔的底边保持一第一距离以为导光板沿第一与第二定位孔方向上的膨胀 提供预留空间, 该第一距离根据导光板与背板受热膨胀的差异来定, 位于 第一与第二定位孔的铆柱分别与第一与第二定位孔的两侧边相抵靠。
在室温时, 位于第一定位槽内的铆柱抵靠于所述第一定位槽梯形斜边 的顶部, 且位于第一定位槽内的铆柱抵靠于所述第一定位槽梯形顶边, 该 位于第一定位槽内的铆柱与所述第一定位槽梯形底边保持一第二距离, 以 为导光板沿第一定位槽方向上的膨胀提供预留空间, 该第二距离根据导光 板与背板受热膨胀的差异来定, 在室温时, 位于第二定位槽内的铆柱抵靠 于所述第二定位槽梯形斜边的顶部, 且位于第二定位槽内的铆柱抵靠于所 述第二定位槽梯形底边, 该位于第二定位槽内的铆柱与所述第二定位槽梯 形顶边保持一第三距离, 以为导光板沿第二定位槽方向上的膨胀提供预留 空间, 该第三距离根据导光板与背板受热膨胀的差异来定, 第一定位槽的 梯形底边长度减去第一定位槽的梯形顶边长度后减去一第四距离等于第二 定位槽的梯形底边长度减去第二定位槽的梯形顶边长度, 该第四距离为导 光板沿第一与第二定位槽方向上的膨胀提供预留空间, 该第四距离根据导 光板与背板受热膨胀的差异来定。
本发明的有益效果: 本发明侧入式背光模组, 通过梯形定位槽的设 置, 使得导光板与铆柱之间始终紧密接触, 避免导光板有过大的自由活动 空间, 有效定位导光板, 同时避免了导光板膨胀而翘曲的状况发生。 为了能更进一步了解本发明的特征以及技术内容, 请参阅以下有关本 发明的详细说明与附图, 然而附图仅提供参考与说明用, 并非用来对本发 明加以限制。 附图说明
下面结合附图, 通过对本发明的具体实施方式详细描述, 将使本发明 的技术方案及其它有益效果显而易见。
附图中,
图 1为现有技术中侧入式背光模组导光板的固定结构示意图; 图 2为现有技术中导光板膨胀翘曲的示意图;
图 3为本发明侧入式背光模组的一实施例的结构示意图;
图 4为本发明侧入式背光模组的另一实施例的结构示意图。 具体实施方式
为更进一步阐述本发明所釆取的技术手段及其效果, 以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图 3 , 本发明提供一种侧入式背光模组, 该背光模组为双侧入 光的背光模组, 其包括: 背板 2、 两相对设置于背板 2 内的背光源 4及设 于背板 2内且位于两背光源 4之间的导光板 6。
所述导光板 6具有两相对的入光侧 60、 及位于两入光侧 60之间且相 对设置的第一安装侧 62与第二安装侧 64, 所述两背光源 4分别对应该两 入光侧 60设置。 通常在使用时, 第一安装侧 62朝上放置, 第二安装侧 64 朝下放置。 所述第一安装侧 62于中间位置设有第一定位孔 622, 且在第一 定位孔 622两侧分别设有第一定位槽 624与第二定位槽 626。 所述第二安 装侧 64对应第一定位孔 622于中间位置设有第二定位孔 642, 所述第二安 装侧 64对应第一与第二定位槽 624、 626在第二定位孔两侧分别设有第三 与第四定位槽 644、 646。
所述背板 2 上设有六个铆柱 22 , 其分别容纳于第一与第二定位孔 622、 642、 及第一、 第二、 第三与第四定位槽 624、 644、 626、 646 内, 从而对该导光板 6进行定位。
所述第一与第二定位孔 622、 642 呈一边开口的矩形, 在室温 (25 °C ) 时, 位于第二定位孔 642 的铆柱 22 与第二定位孔 642 的底边相 4氐 靠, 而位于第一定位孔 622的铆柱 22与第一定位孔 622的底边保持一第 一距离以为导光板 6 沿第一与第二定位孔 622、 642 方向上的膨胀提供预 留空间。 该第一距离根据导光板与背板受热膨胀的差异来定, 具体来说受 导光板尺寸、 材质、 RA ( Reliability Analysis, 可靠性分析)测试条件、 及 背板材质影响, 以釆用 PMMA材质的 55" 导光板及铝材质背板为例, 该 第一距离为 lmm。 位于第一与第二定位孔 622、 642的铆柱 22分别与第一 与第二定位孔 622、 642的两侧边相抵靠。
所述第一定位槽 624呈直角梯形, 其梯形直边开口, 且其梯形斜边沿 朝向第一定位孔 622 的方向向下倾斜, 在室温(25°C ) 时, 位于第一定位 槽 624 内的铆柱 22 ·ί氏靠于所述第一定位槽 624梯形斜边的顶部, 且位于 第一定位槽 624 内的铆柱 22 ·ί氏靠于所述第一定位槽 624梯形顶边, 该位 于第一定位槽 624 内的铆柱 22与所述第一定位槽 624梯形底边保持一第 二距离, 以为导光板 6 沿第一与第二定位槽 624、 626 方向上的膨胀提供 预留空间。 该第二距离根据导光板与背板受热膨胀的差异来定, 具体来说 受导光板尺寸、 材质、 RA测试条件、 及背板材质影响, 以釆用 ΡΜΜΑ材 质的 55" 导光板及铝材质背板为例, 该第二距离为 2mm。
所述第三定位槽 626呈直角梯形, 其梯形直边开口, 且其梯形斜边沿 朝向第一定位孔 622 的方向向下倾斜, 在室温(25°C ) 时, 位于第三定位 槽 626 内的铆柱 22 ·ί氏靠于所述第三定位槽 626梯形斜边的顶部, 且位于 第三定位槽 626 内的铆柱 22 ·ί氏靠于所述第三定位槽 626梯形顶边, 该位 于第三定位槽 626 内的铆柱 22与所述第三定位槽 626梯形底边保持一第 三距离, 以为导光板 6 沿第一与第三定位槽 624、 626 方向上的膨胀提供 预留空间。 该第三距离根据导光板与背板受热膨胀的差异来定, 具体来说 受导光板尺寸、 材质、 RA测试条件、 及背板材质影响, 以釆用 ΡΜΜΑ材 质的 55" 导光板及铝材质背板为例, 该第三距离为 2mm。
所述第二定位槽 644呈直角梯形, 其梯形直边开口, 且其梯形斜边沿 朝向第二定位孔 642 的方向向下倾斜, 在室温(25°C ) 时, 位于第二定位 槽 644 内的铆柱 22 4氏靠于所述第二定位槽 644梯形斜边的顶部, 且位于 第二定位槽 644 内的铆柱 22 ·ί氏靠于所述第二定位槽 644梯形底边。 该位 于第二定位槽 644 内的铆柱 22与所述第二定位槽 644梯形顶边保持一第 四距离, 以为导光板 6 沿第二与第四定位槽 644、 646 方向上的膨胀提供 预留空间。 该第四距离根据导光板与背板受热膨胀的差异来定, 具体来说 受导光板尺寸、 材质、 RA测试条件、 及背板材质影响, 以釆用 ΡΜΜΑ材 质的 55" 导光板及铝材质背板为例, 该第四距离为 2mm。
所述第四定位槽 646呈直角梯形, 其梯形直边开口, 且其梯形斜边沿 朝向第二定位孔 642 的方向向下倾斜, 在室温(25°C ) 时, 位于第四定位 槽 646 内的铆柱 22 4氏靠于所述第四定位槽 646梯形斜边的顶部, 且位于 第四定位槽 646 内的铆柱 22 4氏靠于所述第四定位槽 646梯形底边。 该位 于第四定位槽 646 内的铆柱 22与所述第四定位槽 646梯形顶边保持一第 五距离, 以为导光板 6 沿第二与第四定位槽 644、 646 方向上的膨胀提供 预留空间。 该第五距离根据导光板与背板受热膨胀的差异来定, 具体来说 受导光板尺寸、 材质、 RA测试条件、 及背板材质影响, 以釆用 PMMA材 质的 55" 导光板及铝材质背板为例, 该第五距离为 2mm。
第一定位槽 624的梯形顶边与第二定位槽 644的梯形顶边长度相同, 第一定位槽 624的梯形直边与第二定位槽 644的梯形直边长度相同, 第一 定位槽 624的梯形底边长度比第二定位槽 644的梯形底边长一第六距离, 以为导光板沿第一与第二定位槽 624、 644 方向上的膨胀提供预留空间。 该第六距离根据导光板与背板受热膨胀的差异来定, 具体来说受导光板尺 寸、 材质、 RA测试条件、 及背板材质影响, 以釆用 PMMA材质的 55" 导光板及铝材质背板为例, 该第六距离为 lmm。 作为一种可能的变化情 况, 如果第一定位槽 624的梯形顶边与第二定位槽 644的梯形顶边长度不 相同, 第一定位槽 624的梯形底边长度减去第一定位槽 624的梯形顶边长 度后减去第六距离等于第二定位槽 644 的梯形底边长度减去第二定位槽 644的梯形顶边长度。
同理, 第三定位槽 626的梯形顶边与第四定位槽 646的梯形顶边长度 相同, 第三定位槽 626 的梯形直边与第四定位槽 646 的梯形直边长度相 同, 第三定位槽 626的梯形底边长度比第四定位槽 646的梯形底边长一第 七距离, 以为导光板沿第三与第四定位槽 626、 646 方向上的膨胀提供预 留空间。 该第七距离根据导光板与背板受热膨胀的差异来定, 具体来说受 导光板尺寸、 材质、 RA测试条件、 及背板材质影响, 以釆用 PMMA材质 的 55" 导光板及铝材质背板为例, 该第七距离为 lmm。 作为一种可能的 变化情况, 如果第三定位槽 626的梯形顶边与第四定位槽 646的梯形顶边 长度不相同, 第三定位槽 626的梯形底边长度减去第三定位槽 626的梯形 顶边长度后减去第七距离等于第四定位槽 646 的梯形底边长度减去第四定 位槽 646的梯形顶边长度。
当然, 可根据导光板的尺寸或其它需求, 对定位槽的数量相应作出调 整。
本发明上述定位孔与定位槽与铆柱的配合定位方式, 可以在确保导光 板位置固定的情况下, 当导光板膨胀时可以分别向两个垂直的方向延伸, 从而避免导光板的翘曲。 由于不同尺寸的侧入式背光模组, 导光板的尺寸不同, 其膨胀的长度 也就不同, 因此只需按上述的固定方式, 使导光板在固定时对定位孔、 定 位槽以及铆柱的大小、 位置做相应变化, 即可确保导光板放置于 40 °C的温 箱中进行长期工作也可以不会产生翘曲变形的现象发生。 如果有些产品需 要工作于更高的温度, 则只需给导光板预留更多的膨胀空间, 即可避免导 光板的变形问题。
请参阅图 4 , 为本发明侧入式背光模组的另一实施例的结构示意图, 本实施例的侧入式背光模组为单侧入光的背光模组, 其包括: 背板 2、 设 置于背板 2内的背光源 4及对应背光源 4设置于背板 2内的导光板 7。
所述导光板 7具有一入光侧 70、 及相对设置且位于入光侧 70两端的 第一安装侧 72与第二安装侧 74 , 所述背光源 4对应该入光侧 70设置。 通 常在使用时, 第一安装侧 72朝上放置, 第二安装侧 74朝下放置。 所述第 一安装侧 72靠近入光侧 70设有第一定位孔 722 , 且在其中间位置与远离 第一定位孔 722的端部位置分别设有第一定位槽 724。 所述第二安装侧 74 对应第一定位孔 722于靠近入光侧 70设有第二定位孔 742 , 所述第二安装 侧 74对应第一定位槽 724在中间位置与远离第二定位孔 742的端部位置 分别设有第二定位槽 744。
所述背板 2 上设有六个铆柱 22 , 其分别容纳于第一与第二定位孔 722、 742、 及第一与第二定位槽 724、 744 内, 从而对该导光板 7 进行定 位。
所述第一与第二定位孔 722、 742 呈一边开口的矩形, 在室温 (25 °C ) 时, 位于第二定位孔 742 的铆柱 22 与第二定位孔 742 的底边相 4氐 靠, 而位于第一定位孔 722的铆柱 22与第一定位孔 722的底边保持一第 一距离以为导光板 7 沿第一与第二定位孔 722、 742 方向上的膨胀提供预 留空间。 该第一距离根据导光板与背板受热膨胀的差异来定, 具体来说受 导光板尺寸、 材质、 RA测试条件、 及背板材质影响, 以釆用 PMMA材质 的 55" 导光板及铝材质背板为例, 该第一距离为 lmm。 位于第一与第二 定位孔 722、 742的铆柱 22分别与第一与第二定位孔 722、 742的两侧边 相抵靠。
所述第一定位槽 724呈直角梯形, 其梯形直边开口, 且其梯形斜边沿 朝向第一定位孔 722 的方向向下倾斜, 在室温(25 °C ) 时, 位于第一定位 槽 724 内的铆柱 22 ·ί氏靠于所述第一定位槽 724梯形斜边的顶部, 且位于 第一定位槽 724 内的铆柱 22 ·ί氏靠于所述第一定位槽 724梯形顶边, 该位 于第一定位槽 724 内的铆柱 22与所述第一定位槽 724梯形底边保持一第 二距离, 以为导光板 7沿第一定位槽 724方向上的膨胀提供预留空间。 该 第二距离根据导光板与背板受热膨胀的差异来定, 具体来说受导光板尺 寸、 材质、 RA测试条件、 及背板材质影响, 以釆用 PMMA材质的 55" 导光板及铝材质背板为例, 该第二距离为 2mm。
所述第二定位槽 744呈直角梯形, 其梯形直边开口, 且其梯形斜边沿 朝向第二定位孔 742 的方向向下倾斜, 在室温(25 °C ) 时, 位于第二定位 槽 744 内的铆柱 22 ·ί氏靠于所述第二定位槽 744梯形斜边的顶部, 且位于 第二定位槽 744 内的铆柱 22 ·ί氏靠于所述第二定位槽 744梯形底边。 该位 于第二定位槽 744 内的铆柱 22与所述第二定位槽 744梯形顶边保持一第 三距离, 以为导光板 7沿第二定位槽 744方向上的膨胀提供预留空间。 该 第三距离根据导光板与背板受热膨胀的差异来定, 具体来说受导光板尺 寸、 材质、 RA 测试条件、 及背板材质影响, 以釆用 ΡΜΜΑ材质的 55" 导光板及铝材质背板为例, 该第三距离为 2mm。
第一定位槽 724的梯形顶边与第二定位槽 744的梯形顶边长度相同, 第一定位槽 724的梯形直边与第二定位槽 744的梯形直边长度相同, 第一 定位槽 724的梯形底边长度比第二定位槽 744的梯形底边长一第四距离, 以为导光板沿第一与第二定位槽 724、 744 方向上的膨胀提供预留空间。 该第四距离根据导光板与背板受热膨胀的差异来定, 具体来说受导光板尺 寸、 材质、 RA 测试条件、 及背板材质影响, 以釆用 PMMA材质的 55" 导光板及铝材质背板为例, 该第四距离为 lmm。 作为一种可能的变化情 况, 如果第一定位槽 724的梯形顶边与第二定位槽 744的梯形顶边长度不 相同, 第一定位槽 724的梯形底边长度减去第一定位槽 724的梯形顶边长 度后减去第四距离等于第二定位槽 744 的梯形底边长度减去第二定位槽 744的梯形顶边长度。
当然, 可根据导光板的尺寸或其它需求, 对定位槽的数量相应作出调 整。
本发明上述定位孔与定位槽与铆柱的配合定位方式, 可以在确保导光 板位置固定的情况下, 当导光板膨胀时可以分别向两个垂直的方向延伸, 从而避免导光板的翘曲。
由于不同尺寸的侧入式背光模组, 导光板的尺寸不同, 其膨胀的长度 也就不同, 因此只需按上述的固定方式, 使导光板在固定时对定位孔、 定 位槽以及铆柱的大小、 位置做相应变化, 即可确保导光板放置于 40 °C的温 箱中进行长期工作也可以不会产生翘曲变形的现象发生。 如果有些产品需 要工作于更高的温度, 则只需给导光板预留更多的膨胀空间, 即可避免导 光板的变形问题。
综上所述, 本发明侧入式背光模组, 通过梯形定位槽的设置, 使得导 光板与铆柱之间始终紧密接触, 避免导光板有过大的自由活动空间, 有效 定位导光板, 同时避免了导光板膨胀而翘曲的状况发生。
以上所述, 对于本领域的普通技术人员来说, 可以根据本发明的技术 方案和技术构思作出其他各种相应的改变和变形, 而所有这些改变和变形 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求
1、 一种侧入式背光模组, 包括: 背板、 两相对设置于背板内的背光 源及设于背板内且位于两背光源之间的导光板, 所述导光板具有两相对的 入光侧、 及位于两入光侧之间且相对设置的第一安装侧与第二安装侧, 所 述两背光源分别对应该两入光侧设置, 所述第一安装侧设有第一定位孔, 且在第一定位孔两侧分别设有第一定位槽与第三定位槽, 所述第二安装侧 对应第一定位孔设有第二定位孔, 所述第二安装侧对应第一与第三定位槽 在第二定位孔两侧分别设有第二与第四定位槽, 所述背板上设有六个铆 柱, 其分别容纳于第一与第二定位孔、 及第一、 第二、 第三与第四定位槽 内, 从而对该导光板进行定位, 所述第一与第三定位槽呈直角梯形, 其梯 形直边开口, 且其梯形斜边沿朝向第一定位孔的方向向下倾斜, 所述第二 及第四定位槽呈直角梯形, 其梯形直边开口, 且其梯形斜边沿朝向第二定 位孔的方向向下倾斜, 位于第一、 第二、 第三与第四定位槽内的铆柱分别 抵靠在梯形的斜边上。
2、 如权利要求 1 所述的侧入式背光模组, 其中, 所述第一安装侧于 中间位置设有第一定位孔, 所述第二安装侧对应第一定位孔于中间位置设 有第二定位孔。
3、 如权利要求 1 所述的侧入式背光模组, 其中, 所述第一与第二定 位孔呈一边开口的矩形, 在室温时, 位于第二定位孔的铆柱与第二定位孔 的底边相抵靠, 而位于第一定位孔的铆柱与第一定位孔的底边保持一第一 距离以为导光板沿第一与第二定位孔方向上的膨胀提供预留空间, 该第一 距离根据导光板与背板受热膨胀的差异来定。
4、 如权利要求 1 所述的侧入式背光模组, 其中, 在室温时, 位于第 —定位槽内的铆柱抵靠于所述第一定位槽梯形斜边的顶部, 且位于第一定 位槽内的铆柱抵靠于所述第一定位槽梯形顶边, 该位于第一定位槽内的铆 柱与所述第一定位槽梯形底边保持一第二距离, 以为导光板沿第一与第三 定位槽方向上的膨胀提供预留空间, 该第二距离根据导光板与背板受热膨 胀的差异来定; 在室温时, 位于第三定位槽内的铆柱抵靠于所述第三定位 槽梯形斜边的顶部, 且位于第三定位槽内的铆柱抵靠于所述第三定位槽梯 形顶边, 该位于第三定位槽内的铆柱与所述第三定位槽梯形底边保持一第 三距离, 以为导光板沿第一与第三定位槽方向上的膨胀提供预留空间, 该 第三距离根据导光板与背板受热膨胀的差异来定。
5、 如权利要求 1 所述的侧入式背光模组, 其中, 在室温时, 位于第 二定位槽内的铆柱抵靠于所述第二定位槽梯形斜边的顶部, 且位于第二定 位槽内的铆柱抵靠于所述第二定位槽梯形底边, 该位于第二定位槽内的铆 柱与所述第二定位槽梯形顶边保持一第四距离, 以为导光板沿第二与第四 定位槽方向上的膨胀提供预留空间, 该第四距离根据导光板与背板受热膨 胀的差异来定; 在室温时, 位于第四定位槽内的铆柱抵靠于所述第四定位 槽梯形斜边的顶部, 且位于第四定位槽内的铆柱 ·ί氏靠于所述第四定位槽梯 形底边, 该位于第四定位槽内的铆柱与所述第四定位槽梯形顶边保持一第 五距离, 以为导光板沿第二与第四定位槽方向上的膨胀提供预留空间, 该 第五距离根据导光板与背板受热膨胀的差异来定。
6、 如权利要求 1 所述的侧入式背光模组, 其中, 所述第一定位槽的 梯形底边长度减去第一定位槽的梯形顶边长度后减去一第六距离等于第二 定位槽的梯形底边长度减去第二定位槽的梯形顶边长度, 该第六距离为导 光板沿第一与第二定位槽方向上的膨胀提供预留空间; 第三定位槽的梯形 底边长度减去第三定位槽的梯形顶边长度后减去一第七距离等于第四定位 槽的梯形底边长度减去第四定位槽的梯形顶边长度, 第七距离为导光板沿 第三与第四定位槽方向上的膨胀提供预留空间。
7、 一种侧入式背光模组, 包括: 背板、 两相对设置于背板内的背光 源及设于背板内且位于两背光源之间的导光板, 所述导光板具有两相对的 入光侧、 及位于两入光侧之间且相对设置的第一安装侧与第二安装侧, 所 述两背光源分别对应该两入光侧设置, 所述第一安装侧设有第一定位孔, 且在第一定位孔两侧分别设有第一定位槽与第三定位槽, 所述第二安装侧 对应第一定位孔设有第二定位孔, 所述第二安装侧对应第一与第三定位槽 在第二定位孔两侧分别设有第二与第四定位槽, 所述背板上设有六个铆 柱, 其分别容纳于第一与第二定位孔、 及第一、 第二、 第三与第四定位槽 内, 从而对该导光板进行定位, 所述第一与第三定位槽呈直角梯形, 其梯 形直边开口, 且其梯形斜边沿朝向第一定位孔的方向向下倾斜, 所述第二 及第四定位槽呈直角梯形, 其梯形直边开口, 且其梯形斜边沿朝向第二定 位孔的方向向下倾斜, 位于第一、 第二、 第三与第四定位槽内的铆柱分别 抵靠在梯形的斜边上;
其中, 所述第一安装侧于中间位置设有第一定位孔, 所述第二安装侧 对应第一定位孔于中间位置设有第二定位孔;
其中, 所述第一与第二定位孔呈一边开口的矩形, 在室温时, 位于第 二定位孔的铆柱与第二定位孔的底边相抵靠, 而位于第一定位孔的铆柱与 第一定位孔的底边保持一第一距离以为导光板沿第一与第二定位孔方向上 的膨胀提供预留空间, 该第一距离根据导光板与背板受热膨胀的差异来 定;
其中, 在室温时, 位于第一定位槽内的铆柱抵靠于所述第一定位槽梯 形斜边的顶部, 且位于第一定位槽内的铆柱抵靠于所述第一定位槽梯形顶 边, 该位于第一定位槽内的铆柱与所述第一定位槽梯形底边保持一第二距 离, 以为导光板沿第一与第三定位槽方向上的膨胀提供预留空间, 该第二 距离根据导光板与背板受热膨胀的差异来定; 在室温时, 位于第三定位槽 内的铆柱抵靠于所述第三定位槽梯形斜边的顶部, 且位于第三定位槽内的 铆柱抵靠于所述第三定位槽梯形顶边, 该位于第三定位槽内的铆柱与所述 第三定位槽梯形底边保持一第三距离, 以为导光板沿第一与第三定位槽方 向上的膨胀提供预留空间, 该第三距离根据导光板与背板受热膨胀的差异 来定;
其中, 在室温时, 位于第二定位槽内的铆柱抵靠于所述第二定位槽梯 形斜边的顶部, 且位于第二定位槽内的铆柱抵靠于所述第二定位槽梯形底 边, 该位于第二定位槽内的铆柱与所述第二定位槽梯形顶边保持一第四距 离, 以为导光板沿第二与第四定位槽方向上的膨胀提供预留空间, 该第四 距离根据导光板与背板受热膨胀的差异来定; 在室温时, 位于第四定位槽 内的铆柱 ·ί氐靠于所述第四定位槽梯形斜边的顶部, 且位于第四定位槽内的 铆柱抵靠于所述第四定位槽梯形底边, 该位于第四定位槽内的铆柱与所述 第四定位槽梯形顶边保持一第五距离, 以为导光板沿第二与第四定位槽方 向上的膨胀提供预留空间, 该第五距离根据导光板与背板受热膨胀的差异 来定;
其中, 所述第一定位槽的梯形底边长度减去第一定位槽的梯形顶边长 度后减去一第六距离等于第二定位槽的梯形底边长度减去第二定位槽的梯 形顶边长度, 该第六距离为导光板沿第一与第二定位槽方向上的膨胀提供 预留空间; 第三定位槽的梯形底边长度减去第三定位槽的梯形顶边长度后 减去一第七距离等于第四定位槽的梯形底边长度减去第四定位槽的梯形顶 边长度, 第七距离为导光板沿第三与第四定位槽方向上的膨胀提供预留空 间。
8、 一种侧入式背光模组, 包括: 背板、 设置于背板内的背光源及对 应背光源设置于背板内的导光板, 所述导光板具有一入光侧、 及相对设置 且位于入光侧两端的第一安装侧与第二安装侧, 所述背光源对应该入光侧 设置, 所述第一安装侧设有一第一定位孔及两第一定位槽, 所述第二安装 侧对应第一定位孔设有第二定位孔, 所述第二安装侧对应第一定位槽分别 设有两第二定位槽, 所述背板上设有六个铆柱, 其分别容纳于第一与第二 定位孔、 及第一与第二定位槽内, 从而对该导光板进行定位, 所述第一定 位槽呈直角梯形, 其梯形直边开口, 且其梯形斜边沿朝向第一定位孔的方 向向下倾斜, 所述第二定位槽呈直角梯形, 其梯形直边开口, 且其梯形斜 边沿朝向第二定位孔的方向向下倾斜, 位于第一与第二定位槽内的铆柱分 别抵靠在梯形的斜边上。
9、 如权利要求 8 所述的侧入式背光模组, 其中, 所述第一安装侧靠 近入光侧设有第一定位孔, 且在其中间位置与远离第一定位孔的端部位置 分别设有第一定位槽, 所述第二安装侧对应第一定位孔于靠近入光侧设有 第二定位孔, 所述第二安装侧对应第一定位槽在中间位置与远离第二定位 孔的端部位置分别设有第二定位槽。
10、 如权利要求 8所述的侧入式背光模组, 其中, 所述第一与第二定 位孔呈一边开口的矩形, 在室温时, 位于第二定位孔的铆柱与第二定位孔 的底边相抵靠, 而位于第一定位孔的铆柱与第一定位孔的底边保持一第一 距离以为导光板沿第一与第二定位孔方向上的膨胀提供预留空间, 该第一 距离根据导光板与背板受热膨胀的差异来定, 位于第一与第二定位孔的铆 柱分别与第一与第二定位孔的两侧边相抵靠。
11、 如权利要求 8 所述的侧入式背光模组, 其中, 在室温时, 位于第 一定位槽内的铆柱抵靠于所述第一定位槽梯形斜边的顶部, 且位于第一定 位槽内的铆柱抵靠于所述第一定位槽梯形顶边, 该位于第一定位槽内的铆 柱与所述第一定位槽梯形底边保持一第二距离, 以为导光板沿第一定位槽 方向上的膨胀提供预留空间, 该第二距离根据导光板与背板受热膨胀的差 异来定, 在室温时, 位于第二定位槽内的铆柱抵靠于所述第二定位槽梯形 斜边的顶部, 且位于第二定位槽内的铆柱抵靠于所述第二定位槽梯形底 边, 该位于第二定位槽内的铆柱与所述第二定位槽梯形顶边保持一第三距 离, 以为导光板沿第二定位槽方向上的膨胀提供预留空间, 该第三距离根 据导光板与背板受热膨胀的差异来定, 第一定位槽的梯形底边长度减去第 一定位槽的梯形顶边长度后减去一第四距离等于第二定位槽的梯形底边长 度减去第二定位槽的梯形顶边长度, 该第四距离为导光板沿第一与第二定 位槽方向上的膨胀提供预留空间, 该第四距离根据导光板与背板受热膨胀 的差异来定。
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