WO2012023484A1 - Lighting apparatus and display apparatus - Google Patents

Lighting apparatus and display apparatus Download PDF

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Publication number
WO2012023484A1
WO2012023484A1 PCT/JP2011/068353 JP2011068353W WO2012023484A1 WO 2012023484 A1 WO2012023484 A1 WO 2012023484A1 JP 2011068353 W JP2011068353 W JP 2011068353W WO 2012023484 A1 WO2012023484 A1 WO 2012023484A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
positioning
cushion member
light
Prior art date
Application number
PCT/JP2011/068353
Other languages
French (fr)
Japanese (ja)
Inventor
良武 石元
Original Assignee
シャープ株式会社
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 シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012023484A1 publication Critical patent/WO2012023484A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package

Definitions

  • the present invention relates to a lighting device and a display device.
  • the liquid crystal display panel that displays images does not emit light, so an illumination device is installed on the back side of the liquid crystal display panel (the side opposite to the display surface side of the liquid crystal display panel)
  • the liquid crystal display panel is illuminated with light from the illumination device.
  • the illuminating device installed in the back surface side of a liquid crystal display panel is called the backlight unit etc., for example.
  • the backlight unit installed in the liquid crystal display device is roughly classified into two types, a direct type and an edge light type.
  • each of the direct type backlight unit and the edge light type backlight unit will be briefly described.
  • a light source is provided directly below the liquid crystal display panel (an area facing the back surface of the liquid crystal display panel). Is arranged. The light emitted from the light source illuminates the liquid crystal display panel via an optical sheet (such as a diffusion sheet, a lens sheet, and a polarizing sheet).
  • an optical sheet such as a diffusion sheet, a lens sheet, and a polarizing sheet.
  • a light guide plate is disposed immediately below the liquid crystal display panel, and a light source is disposed to face a predetermined side end surface of the light guide plate.
  • a light source is disposed to face a predetermined side end surface of the light guide plate.
  • an edge light type backlight unit components such as a light guide plate and a light source are usually accommodated in an accommodation area of a casing (accommodating container).
  • the light guide plate is held and positioned in the housing region of the housing.
  • a convex portion for positioning is formed on the housing, and a concave portion for positioning into which the convex portion of the housing is fitted is formed on the light guide plate.
  • Patent Document 1 Japanese Patent Document 1
  • the light guide plate When positioning the light guide plate using the conventional method described above, in order to ensure the positioning of the light guide plate, there is no gap between the positioning convex portion of the housing and the positioning concave portion of the light guide plate. Must be mated. However, if the convex portion of the housing and the concave portion of the light guide plate are fitted without a gap, the light guide plate is damaged (for example, the light guide plate is broken) when the light guide plate is expanded and deformed due to heat. appear.
  • the present invention has been made in order to solve the above-described problems, and an object thereof is to provide an illumination device and a display device capable of reliably positioning the light guide plate while suppressing damage to the light guide plate. To do.
  • a lighting device includes a housing, a front surface housed in the housing and facing the illuminated body, a rear surface opposite to the front surface, and a front surface. And a light guide plate having a plurality of side end surfaces connected to the rear surface, and a positioning concave portion formed on a predetermined side end surface of the plurality of side end surfaces, and a fitting portion fitted into the positioning concave portion of the light guide plate A positioning member.
  • a surface of the fitting portion of the positioning member that faces the concave surface of the positioning concave portion of the light guide plate is covered with an elastically deformable cushion member.
  • the concave surface of the positioning concave portion of the light guide plate in the surface of the fitting portion of the positioning member is opposed.
  • the cushion member is prevented from generating a gap between the positioning concave portion of the light guide plate and the cushion member. Restore and transform. From these things, rattling of the light guide plate is suppressed and the light guide plate can be positioned reliably.
  • the positioning of the light guide plate is achieved by the function of the cushion member.
  • the stress generated between the concave portion for use and the fitting portion of the positioning member is relieved. For this reason, inconveniences such as damage to the light guide plate (for example, breakage of the light guide plate) can be avoided.
  • the cushion member is fixed to the surface of the fitting portion of the positioning member.
  • the positioning member is made of a pin-like member erected along the thickness direction of the light guide plate. If comprised in this way, the fitting part of a positioning member (pin-shaped member) can be easily engage
  • a pin-shaped member used as a positioning member it is a positioning pin etc., for example.
  • the positioning member is a pin-shaped member
  • the surface of the fitting portion of the positioning member is covered with a cushion member over the entire circumference. If comprised in this way, when assembling a positioning member, it becomes unnecessary to consider the position of the circumferential direction of a positioning member. That is, the assembly work of the positioning member is simplified.
  • the cushion member In the configuration in which the surface of the fitting portion of the positioning member (pin-shaped member) is covered with the cushion member over the entire circumference, the cushion member is processed into a cylindrical shape in advance, and the cushion member processed into the cylindrical shape in advance
  • the fitting portion of the positioning member may be inserted into the hollow portion. If comprised in this way, the surface of the fitting part of a positioning member can be easily covered with a cushion member over a perimeter. Furthermore, since the cushion member is unlikely to come off from the fitting portion of the positioning member, the reliability is improved.
  • the cushion member is a sheet shape, and the sheet-like cushion member is the fitting portion of the positioning member. It may be wound around. If comprised in this way, the thickness of a cushion member can be adjusted by changing the winding number of a cushion member. Further, even if the positioning member has a triangular prism shape or a quadrangular prism shape, it is easy to cover the surface of the fitting portion of the positioning member with the cushion member over the entire circumference.
  • flanges are formed at both ends in the pin axis direction of the fitting portion of the positioning member. Is preferred. With this configuration, even if the cushion member tries to move in the pin axis direction, the movement of the cushion member in the pin axis direction is restricted by the flange portion of the positioning member. For this reason, it can suppress that a cushion member falls out from the fitting part of a positioning member.
  • the pin axis direction is the same direction as the thickness direction of the light guide plate.
  • the display device includes the illumination device according to the first aspect and a display panel illuminated with light from the illumination device.
  • the light guide plate can be reliably positioned while suppressing damage to the light guide plate.
  • an illumination device and a display device capable of reliably positioning the light guide plate while suppressing damage to the light guide plate.
  • This display device is a liquid crystal display device, and as shown in FIG. 1, a liquid crystal display panel 10 for displaying an image, and a backlight unit 20 installed on the back surface side opposite to the display surface side of the liquid crystal display panel 10. And at least.
  • the liquid crystal display panel 10 is an example of the “illuminated body” and the “display panel” in the present invention.
  • the backlight unit 20 is an example of the “lighting device” in the present invention.
  • the liquid crystal display device further includes a bezel BZ as a casing, and the liquid crystal display panel 10 and the backlight unit 20 are covered from the display surface side of the liquid crystal display panel 10 by the bezel BZ.
  • the liquid crystal display panel 10 has a display area where an image is actually displayed and a non-display area which is an outer edge area of the display area. A plurality of pixels arranged in a matrix are formed in the display area of the liquid crystal display panel 10.
  • Each of the plurality of pixels is driven by a switching element, a pixel electrode, a common electrode, and the like. Note that the switching element, the pixel electrode, and the common electrode are not shown in order to make the drawing easy to see, and wirings that are electrically connected to them are not shown.
  • the switching element is made of a TFT (thin film transistor), the gate of the switching element is connected to a gate line (scanning line), and the source of the switching element is connected to a source line (data line).
  • a pixel electrode is connected to the drain of the switching element, a common electrode is disposed so as to face the pixel electrode, and a liquid crystal (not shown) is sandwiched between the pixel electrode and the common electrode.
  • the switching elements are individually provided for each pixel, and the pixel electrodes are also individually provided for each pixel.
  • the common electrode is common to each pixel.
  • the backlight unit 20 is of an edge light type, emits white backlight light in a planar shape, and uniformly illuminates the back surface of the liquid crystal display panel 10 with the backlight light.
  • the optical property (light transmittance) of the liquid crystal is changed for each pixel based on the video signal. Specifically, in each pixel, an electric field is generated between the pixel electrode and the common electrode by supplying predetermined power to the pixel electrode via the switching element. The orientation of the liquid crystal, that is, the transmittance of light transmitted through the liquid crystal is changed by the electric field generated between the pixel electrode and the common electrode.
  • the liquid crystal display panel 10 includes at least two transparent substrates 11 and 12 as shown in FIG.
  • One transparent substrate 11 is referred to as an active matrix substrate, and the other transparent substrate 12 may be referred to as a counter substrate because it is disposed opposite to the transparent substrate 11, or a color substrate.
  • a switching element and a pixel electrode are formed, and a gate line (scanning line) and a source line (data line) electrically connected to them are also formed.
  • a common electrode is formed on a predetermined surface of the other transparent substrate 12.
  • a color filter is further formed on the predetermined surface of the other transparent substrate 12 as necessary.
  • Each predetermined surface of the two transparent electrodes 11 and 12 is covered with an alignment film (not shown) capable of aligning the liquid crystal in a specific direction.
  • the two transparent substrates 11 and 12 are bonded to each other via a seal material (not shown) so that their predetermined surfaces face each other.
  • a liquid crystal is sealed between the two transparent substrates 11 and 12.
  • the liquid crystal is sandwiched between the pixel electrode and the common electrode (between the alignment film covering the predetermined surface of one transparent substrate 11 and the alignment film covering the predetermined surface of the other transparent electrode 12). ing.
  • the outer sizes of the two transparent substrates 11 and 12 are different from each other, and the outer size of the transparent substrate 11 is larger than the outer size of the transparent substrate 12. Accordingly, the two transparent substrates 11 and 12 are bonded to each other, but the predetermined ends of the transparent substrates 11 and 12 do not match each other, and a part of the predetermined surface of the transparent substrate 11 is separated from the transparent substrate 12. Exposed. The exposed portion of the predetermined surface of the transparent substrate 11 is a region of a non-display area, and is used for electrically connecting a driver (not shown) to the transparent substrate 11.
  • a polarizing sheet 13 that transmits only light waves in a specific vibration direction is attached to each of the surfaces of the two transparent substrates 11 and 12 opposite to the predetermined surfaces (surfaces on the liquid crystal side). Yes.
  • the transmission axis directions of the two polarizing sheets 13 are shifted from each other by about 90 °.
  • the backlight unit 20 installed on the back side of the liquid crystal display panel 10 includes a back chassis 21, a reflection sheet 22, a light guide plate 23, an optical sheet 24, and a light source module. 25.
  • the back chassis 21 is an example of the “housing” in the present invention.
  • the back chassis 21 is formed in a substantially box shape with the liquid crystal display panel 10 side opened. That is, the back chassis 21 has a bottom portion and side portions erected on the outer periphery of the bottom portion. An area surrounded by the bottom and sides of the back chassis 21 is an accommodation area, and the reflection sheet 22, the light guide plate 23, the optical sheet 24, and the light source module 25 are accommodated in the accommodation area of the back chassis 21. Is done.
  • the reflection sheet 22 is placed on the inner surface (bottom surface) of the bottom of the back chassis 21. That is, due to the presence of the reflection sheet 22, the inner surface of the bottom portion of the back chassis 21 is a light reflection surface.
  • the light guide plate 23 introduces light from the light source module 25 and emits the light toward the liquid crystal display panel 10 side.
  • the light guide plate 23 is formed on the front surface 23a and the rear surface 23b opposite to the front surface 23a, and on the front surface 23a and the rear surface 23b.
  • the plurality of side end surfaces are connected to each other, and are placed on the inner surface of the bottom portion of the back chassis 21 via the reflection sheet 22.
  • the front surface 23 a of the light guide plate 23 is directed toward the liquid crystal display panel 10, and the rear surface 23 b of the light guide plate 23 is directed toward the bottom side of the back chassis 21.
  • the front surface 23a of the light guide plate 23 becomes a light emitting surface for emitting light introduced into the light guide plate 23 (light from the light source module 25) toward the liquid crystal display panel 10 side.
  • the rear surface 23b of the light guide plate 23 is covered with the reflection sheet 22, it does not become a light emission surface.
  • the outer shape of the light guide plate 23 (planar shape of the front surface 23 a and the rear surface 23 b) is substantially rectangular in a plan view from the side facing the front surface 23 a of the light guide plate 23. . That is, the light guide plate 23 has four side end faces 23c to 23f. Of the four side end surfaces 23c to 23f of the light guide plate 23, the side end surface 23c is a light incident surface on which light from the light source module 25 is incident. For this reason, the light from the light source module 25 is introduced into the light guide plate 23 through the side end surface (light incident surface) 23 c of the light guide plate 23.
  • the side end surfaces 23c and 23d of the light guide plate 23 are surfaces that face in opposite directions and are parallel to the longitudinal direction (X direction) of the light guide plate 23 in plan view. Further, the side end surfaces 23e and 23f of the light guide plate 23 are surfaces facing in opposite directions to each other and parallel to the short direction (Y direction) of the light guide plate 23 in plan view.
  • the optical sheet 24 shown in FIGS. 1 and 2 includes a diffusion sheet, a lens sheet, and the like, and is placed on the front surface (light emitting surface) 23a of the light guide plate 23.
  • the optical sheet 24 diffuses or collects light emitted from the front surface (light emitting surface) 23a of the light guide plate 23.
  • the type and the number of sheets used of the optical sheet 24 are appropriately changed according to the application.
  • the light source module 25 is for generating light (light introduced into the light guide plate 23) as a base of backlight light, and is disposed on the side end surface (light incident surface) 23c side of the light guide plate 23.
  • the number of light source modules 25 used is not particularly limited.
  • the light source module 25 may be further added, and the added light source module 25 may be disposed on the side end face 23 d side of the light guide plate 23.
  • the side end surface 23d of the light guide plate 23 may also function as a light incident surface.
  • the light source module 25 has a structure in which a plurality of LEDs 27 are mounted on a mounting surface 26a of the same printed circuit board 26. Note that the number of LEDs 27 mounted is not particularly limited, and can be changed according to the application.
  • the printed circuit board 26 is made of an FPC (flexible printed wiring board) formed in a strip shape, and the mounting surface 26a is held so as to face the side end surface (light incident surface) 23c of the light guide plate 23. For this reason, the LED 27 mounted on the mounting surface 26 a of the printed circuit board 26 also faces the side end surface (light incident surface) 23 c of the light guide plate 23. Accordingly, when light is emitted from the LED 27, the light enters the side end face (light incident surface) 23 c of the light guide plate 23 and is introduced into the light guide plate 23.
  • FPC flexible printed wiring board
  • the LED 27 is a white LED, for example, a combination of a phosphor that converts blue (blue-violet) LED light into yellow and a blue LED (blue-violet LED). Note that a combination of a phosphor that converts blue (blue-violet) LED light into green and red and a blue LED (blue-violet LED) may be used as LED 27, and three types of blue LED, green LED, and red LED may be used. It is good also as what combined LED of LED27.
  • the light guide plate 23 In order to make the light from the light source module 25 incident on the side end surface (light incident surface) 23c of the light guide plate 23 efficiently, the light guide plate 23 must be accurately positioned in the accommodation region of the back chassis 21. Is required.
  • the two positioning pins 31 are attached to the bottom of the back chassis 21, and the positioning of the light guide plate 23 in the accommodation area of the back chassis 21 is performed with high accuracy using the positioning pins 31.
  • the positioning pin 31 is an example of the “positioning member” and “pin-shaped member” in the present invention.
  • one positioning pin 31 is disposed on each side of the side end faces 23e and 23f of the light guide plate 23 and is directed from the bottom of the back chassis 21 into the accommodation area. It is erected so as to extend along the direction (the thickness direction of the light guide plate 23).
  • the constituent material and shape of the positioning pin 31 are not particularly limited.
  • a metal such as aluminum or stainless steel is used as the constituent material of the positioning pin 31, and the positioning pin 31 has a substantially cylindrical shape. It is said.
  • each of the side end faces 23 e and 23 f of the light guide plate 23 is formed with a positioning recess (notch) 23 g.
  • the side end surfaces 23e and 23f in which the concave portion 23g of the light guide plate 23 is formed are an example of the “predetermined side end surface” in the present invention.
  • the reflective sheet 22 is also formed with a recess 22 a similar to the recess 23 g of the light guide plate 23.
  • the recess 23 g formed on the side end surface 23 e of the light guide plate 23 is U-shaped in one direction in the X direction from the surface of the side end surface 23 e (the direction from the side end surface 23 e to the side end surface 23 f). It consists of a notch cut into a letter shape and is arranged at the center of the side end face 23e in the Y direction.
  • the recess 23g formed on the side end face 23f of the light guide plate 23 is U-shaped in the other direction opposite to one direction in the X direction from the surface of the side end face 23f (the direction from the side end face 23f toward the side end face 23e).
  • the recess 23g of the light guide plate 23 corresponds to a through-hole whose opening shape is a substantially semicircular shape.
  • a predetermined portion of the positioning pin 31 (hereinafter referred to as a fitting portion 31a) is fitted into the recess 23g of the light guide plate 23, thereby restricting movement (positional deviation) of the light guide plate 23 in the X direction and the Y direction.
  • a fitting portion 31a A predetermined portion of the positioning pin 31 (hereinafter referred to as a fitting portion 31a) is fitted into the recess 23g of the light guide plate 23, thereby restricting movement (positional deviation) of the light guide plate 23 in the X direction and the Y direction.
  • the cushion member 32 is sandwiched between the concave portion 23 g of the light guide plate 23 and the fitting portion 31 a of the positioning pin 31.
  • the gap between the concave portion 23 g of the light guide plate 23 and the fitting portion 31 a of the positioning pin 31 is substantially filled with the cushion member 32.
  • the constituent material of this cushion member 32 is not specifically limited, For example, it is a cushion material which can be elastically deformed, such as urethane and sponge.
  • the fitting portion 31a of the positioning pin 31 is not in contact with the concave surface of the concave portion 23g of the light guide plate 23, and the cushion member 32 is always in contact with substantially the entire concave surface of the concave portion 23g of the light guide plate 23. is doing. That is, there is no gap between the concave surface of the concave portion 23 g of the light guide plate 23 and the cushion member 32 in each of the X direction and the Y direction.
  • the cushion member 32 is separated from the concave surface of the concave portion 23 g of the light guide plate 23, but actually, the cushion member 32 contacts the concave surface of the concave portion 23 g of the light guide plate 23. is doing.
  • the cushion member 32 is fixed to the entire surface of the fitting portion 31a of the positioning pin 31 so that the surface of the fitting portion 31a of the positioning pin 31 extends over the entire periphery. It is in a state covered with the cushion member 32 (a state in which the fitting portion 31a of the positioning pin 31 is inserted into the hollow portion 32a of the cylindrical cushion member 32).
  • the cushion member 32 fixed to the surface of the fitting portion 31a of the positioning pin 31 is elastically deformed (compressed) by being sandwiched between the concave portion 23g of the light guide plate 23 and the fitting portion 31a of the positioning pin 31. Has been. Therefore, an urging force that presses the concave surface of the concave portion 23 g of the light guide plate 23 is always generated in the cushion member 32.
  • both ends of the fitting portion 31a of the positioning pin 31 in the pin axial direction (Z direction) are respectively larger than the outer diameter of the fitting portion 31a of the positioning pin 31.
  • a flange portion 31b having a diameter is formed. That is, the fitting portion 31a of the positioning pin 31 is a small diameter portion, and both end portions in the Z direction of the fitting portion 31a of the positioning pin 31 are large diameter portions. Steps are formed at both ends in the Z direction of the joint portion 31a.
  • the cushion member 32 fixed to the surface of the fitting portion 31 a of the positioning pin 31 is restricted by the flange portion 31 b of the positioning pin 31 from moving in the Z direction.
  • the method of fixing the cushion member 32 to the surface of the fitting portion 31a of the positioning pin 31 is not particularly limited.
  • a cushion member 32 that has been processed into a cylindrical shape in advance is prepared, and the cylindrical member
  • the fitting portion 31a of the positioning pin 31 may be inserted into the hollow portion (hole portion having a circular opening) 32a of the cushion member 32.
  • a sheet-like cushion member 32 may be prepared, and the sheet-like cushion member 32 may be wound around the fitting portion 31 a of the positioning pin 31 over the entire circumference. .
  • the elastically deformable cushion member 32 At least the surface of the fitting portion 31a of the positioning pin 31 that faces the concave surface of the concave portion 23g of the light guide plate 23 is covered with the elastically deformable cushion member 32, thereby introducing a guide. Even if the light plate 23 expands and deforms due to the influence of heat, the cushion member 32 can absorb the expansion and deformation of the light guide plate 23. For this reason, it is not necessary to provide a gap between the recess 23g of the light guide plate 23 and the cushion member 32 in advance.
  • the cushion member 32 is always elastically deformed (compressed), so that even if the light guide plate 23 is contracted and deformed, the cushion is formed so that no gap is generated between the recess 23g of the light guide plate 23 and the cushion member 32. The member 32 is restored and deformed. From these things, since the shakiness of the light-guide plate 23 is suppressed, the light-guide plate 23 can be positioned reliably.
  • the light guide plate can be obtained by the function of the cushion member 32.
  • the stress generated between the recess 23g of the 23 and the fitting portion 31a of the positioning pin 31 is relieved. Therefore, inconveniences such as damage to the light guide plate 23 (for example, the light guide plate 23 breaks) can be avoided.
  • the cushion member 32 by attaching the cushion member 32 to the surface of the fitting portion 31a of the positioning pin 31, it is possible to easily guide at least the surface of the fitting portion 31a of the positioning pin 31. It is possible to keep the state where the surface of the optical plate 23 facing the concave surface of the concave portion 23g is covered with the cushion member 32.
  • the positioning pin 31 when the positioning pin 31 is attached to the bottom of the back chassis 21 by covering the surface of the fitting portion 31a of the positioning pin 31 with the cushion member 32 over the entire circumference, There is no need to consider the circumferential position of 31. That is, the attaching operation of the positioning pins 31 to the bottom portion of the back chassis 21 is simplified.
  • the processing time of the light-guide plate 23 is shortened by making the shape of the recessed part 23g formed in the light-guide plate 23 into a U shape as mentioned above, the processing operation of the light-guide plate 23 is carried out. Efficiency can be increased.
  • a cushion member 32 that has been processed into a cylindrical shape is prepared in advance, and the positioning pin 31 is inserted into the hollow portion 32 a of the cylindrical cushion member 32.
  • the method of inserting the fitting part 31a is employed, the surface of the fitting part 31a of the positioning pin 31 can be easily covered with the cushion member 32 over the entire circumference. Furthermore, it becomes difficult for the cushion member 32 to come off from the fitting portion 31a of the positioning pin 31, and the reliability is improved.
  • the sheet-like cushion member 32 is prepared and the method of winding the sheet-like cushion member 32 around the fitting portion 31a of the positioning pin 31 over the entire circumference is adopted, the number of turns of the cushion member 32 is set. By changing, the thickness of the cushion member 32 can be adjusted. Even if the positioning pin 31 has a triangular prism shape or a quadrangular prism shape, it is easy to cover the surface of the fitting portion 31a of the positioning pin 31 with the cushion member 32 over the entire circumference.
  • the surface of the fitting portion 31a of the positioning pin 31 is covered with the cushion member 32 over the entire circumference.
  • the present invention is not limited to this, and as shown in FIG. Of the surface of the fitting portion 31a, only the surface facing the concave surface of the concave portion 23g of the light guide plate 23 may be covered with the cushion member 32, and the other surfaces may not be covered with the cushion member 32.
  • the cushion member 32 is separated from the concave surface of the concave portion 23 g of the light guide plate 23, but actually, the cushion member 32 contacts the concave surface of the concave portion 23 g of the light guide plate 23. is doing.
  • the recesses 23g are formed in the side end surfaces 23e and 23f parallel to each other among the four side end surfaces 23c to 23f of the light guide plate 23.
  • the present invention is not limited to this, and FIG. As shown, a recess 23g may be formed on the side end surface 23e of the light guide plate 23 and a side end surface 23d that forms a right angle with the side end surface 23e.
  • the side end surfaces 23d and 23e of the light guide plate 23 correspond to “predetermined side end surfaces” of the present invention.
  • the recess 23g may be formed on each of the side end faces 23f and 23d of the light guide plate 23 that are perpendicular to each other.
  • the side end surface 23c of the light guide plate 23 functions as a light incident surface, it is preferable not to form the recess 23g on the side end surface 23c of the light guide plate 23.
  • a notch cut into U shape (substantially semicircle shape) from the surface of the side end surface 23e (23f) of the light-guide plate 23 was set as the recessed part 23g, this invention is not limited to this.
  • a notch cut into a square shape from the surface of the side end face 23e (23f) of the light guide plate 23 may be a recess 23g, or the side of the light guide plate 23 as shown in FIG.
  • a notch cut in a triangular shape from the surface of the end face 23e (23f) may be used as the recess 23g.
  • a notch cut into a U shape (substantially semicircular shape) from the surface of the side end face 23e (23f) of the light guide plate 23 is the recess 23g.
  • the light guide plate 23 is positioned using the positioning pins 31 which are members different from the back chassis 21.
  • the present invention is not limited to this, for example, the back chassis 21 is not shown.
  • the light guide plate 23 may be positioned by using a positioning projection formed integrally with the positioning pin 31, that is, the member corresponding to the “positioning member” of the present invention may not be the positioning pin 31.
  • the LED 27 is used as the light source of the backlight unit 20, but the present invention is not limited to this, and a cold cathode tube or the like may be used as the light source of the backlight unit 20.
  • the present invention is not limited to this, and the present invention may be applied to display devices other than the liquid crystal display device.
  • Liquid crystal display panel (display panel) 20
  • Backlight unit (lighting device) 21
  • Back chassis (housing) 23 light guide plate 23a front surface 23b rear surface 23c, 23d, 23e, 23f side end surface 31 positioning pin (positioning member, pin-shaped member) 31a fitting part 31b collar part 32 cushion member 32a hollow part

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

Provided is a lighting apparatus, wherein positioning of a light guiding plate can be executed with reliability, while damages to the light guiding plate is inhibited. The lighting apparatus is provided with: a light guiding plate (23) that has positioning recess sections (23g) formed on side-end faces (23e, 23f) thereof; and positioning pins (31) comprising intermeshing sections (31a) that are to be intermeshed into the recess sections (23g). At least faces of the intermeshing sections (31a) that face the recess faces of the recess sections (23g), among all the faces of the intermeshing sections (31a), are covered by cushion members (32).

Description

照明装置および表示装置Illumination device and display device
　本発明は、照明装置および表示装置に関する。 The present invention relates to a lighting device and a display device.
　表示装置の一つである液晶表示装置では、映像を表示する液晶表示パネルが非発光であるため、液晶表示パネルの裏面側（液晶表示パネルの表示面側とは反対側）に照明装置を設置し、その照明装置からの光で液晶表示パネルを照明するようになっている。なお、液晶表示パネルの裏面側に設置される照明装置は、たとえば、バックライトユニットなどと称されている。 In a liquid crystal display device that is one of the display devices, the liquid crystal display panel that displays images does not emit light, so an illumination device is installed on the back side of the liquid crystal display panel (the side opposite to the display surface side of the liquid crystal display panel) The liquid crystal display panel is illuminated with light from the illumination device. In addition, the illuminating device installed in the back surface side of a liquid crystal display panel is called the backlight unit etc., for example.
　また、液晶表示装置に設置されるバックライトユニットは、大別すると直下型とエッジライト型との２種類に分類される。 In addition, the backlight unit installed in the liquid crystal display device is roughly classified into two types, a direct type and an edge light type.
　直下型のバックライトユニットおよびエッジライト型のバックライトユニットのそれぞれの構成を簡単に説明すると、直下型のバックライトユニットでは、液晶表示パネルの直下（液晶表示パネルの裏面と対向する領域）に光源が配置されている。そして、光源から発せられた光は、光学シート（拡散シート、レンズシートおよび偏光シートなど）を介して液晶表示パネルを照明する。 The configuration of each of the direct type backlight unit and the edge light type backlight unit will be briefly described. In the direct type backlight unit, a light source is provided directly below the liquid crystal display panel (an area facing the back surface of the liquid crystal display panel). Is arranged. The light emitted from the light source illuminates the liquid crystal display panel via an optical sheet (such as a diffusion sheet, a lens sheet, and a polarizing sheet).
　それに対して、エッジライト型のバックライトユニットでは、液晶表示パネルの直下に導光板が配置されており、その導光板の所定の側端面と対向するように光源が配置されている。このエッジライト型のバックライトユニットの照明動作としては、光源から光が発せられると、その光が導光板の所定の側端面から導光板内に導入される。そして、導光板内に導入された光は、反復反射を繰り返して導光板の前面（液晶表示パネル側に向く面）から面状に出射した後、光学シートを介して液晶表示パネルを照明する。 On the other hand, in the edge light type backlight unit, a light guide plate is disposed immediately below the liquid crystal display panel, and a light source is disposed to face a predetermined side end surface of the light guide plate. As an illumination operation of the edge light type backlight unit, when light is emitted from the light source, the light is introduced into the light guide plate from a predetermined side end surface of the light guide plate. Then, the light introduced into the light guide plate is repeatedly reflected and emitted in a planar shape from the front surface (surface facing the liquid crystal display panel side) of the light guide plate, and then illuminates the liquid crystal display panel via the optical sheet.
　これら２種類のバックライトユニットは用途に応じて使い分けられるが、薄型に特化した液晶表示装置では、薄型化に有利なエッジライト型のバックライトユニットが採用される。 These two types of backlight units can be properly used according to the application, but in thin liquid crystal display devices, an edge light type backlight unit advantageous for thinning is adopted.
　ところで、エッジライト型のバックライトユニットでは、通常、導光板や光源などの構成部材を筐体（収容容器）の収容領域内に収容している。そして、筐体の収容領域内において導光板を保持し、かつ、位置決めしている。 By the way, in an edge light type backlight unit, components such as a light guide plate and a light source are usually accommodated in an accommodation area of a casing (accommodating container). The light guide plate is held and positioned in the housing region of the housing.
　導光板の位置決め方法としては、たとえば、筐体に位置決め用の凸部を形成するとともに、さらに、その筐体の凸部が嵌め込まれる位置決め用の凹部を導光板に形成し、筐体の凸部を導光板の凹部に嵌め込むという方法が従来から知られている（たとえば、特許文献１参照）。 As a method for positioning the light guide plate, for example, a convex portion for positioning is formed on the housing, and a concave portion for positioning into which the convex portion of the housing is fitted is formed on the light guide plate. Is conventionally known (see Patent Document 1, for example).
特開２０１０－２７４５号公報JP 2010-2745 A
　上記した従来の方法を用いて導光板の位置決めを行う場合、導光板の位置決めを確実なものにするためには、筐体の位置決め用の凸部と導光板の位置決め用の凹部とを隙間なく嵌合させる必要がある。しかしながら、筐体の凸部と導光板の凹部とを隙間なく嵌合させると、導光板が熱の影響で膨張変形したときに、導光板が損傷する（たとえば、導光板が割れる）という不都合が発生する。 When positioning the light guide plate using the conventional method described above, in order to ensure the positioning of the light guide plate, there is no gap between the positioning convex portion of the housing and the positioning concave portion of the light guide plate. Must be mated. However, if the convex portion of the housing and the concave portion of the light guide plate are fitted without a gap, the light guide plate is damaged (for example, the light guide plate is broken) when the light guide plate is expanded and deformed due to heat. appear.
　一方で、導光板が熱の影響で膨張変形することを考慮して、筐体の凸部と導光板の凹部との間に予め空隙を設ければ、導光板にガタツキが発生する。すなわち、導光板の位置決めが確実に行われなくなってしまう。 On the other hand, in consideration of the expansion and deformation of the light guide plate due to the influence of heat, if a gap is provided in advance between the convex portion of the housing and the concave portion of the light guide plate, the light guide plate is rattled. That is, the positioning of the light guide plate is not reliably performed.
　本発明は、上記課題を解決するためになされたものであり、導光板の損傷を抑制しながら、導光板の位置決めを確実に行うことが可能な照明装置および表示装置を提供することを目的とする。 The present invention has been made in order to solve the above-described problems, and an object thereof is to provide an illumination device and a display device capable of reliably positioning the light guide plate while suppressing damage to the light guide plate. To do.
　上記目的を達成するために、本発明の第１の局面による照明装置は、筐体と、筐体に収容され、被照明体側に向くことになる前面および前面の反対面である後面と、前面および後面に繋がる複数の側端面とを有するとともに、複数の側端面のうちの所定の側端面に位置決め用の凹部が形成された導光板と、導光板の位置決め用の凹部に嵌め込まれる嵌合部を有する位置決め部材とを備えている。そして、位置決め部材の嵌合部の表面のうちの少なくとも導光板の位置決め用の凹部の凹面と対向する面が弾性変形可能なクッション部材で覆われている。 In order to achieve the above object, a lighting device according to a first aspect of the present invention includes a housing, a front surface housed in the housing and facing the illuminated body, a rear surface opposite to the front surface, and a front surface. And a light guide plate having a plurality of side end surfaces connected to the rear surface, and a positioning concave portion formed on a predetermined side end surface of the plurality of side end surfaces, and a fitting portion fitted into the positioning concave portion of the light guide plate A positioning member. In addition, at least a surface of the fitting portion of the positioning member that faces the concave surface of the positioning concave portion of the light guide plate is covered with an elastically deformable cushion member.
　第１の局面による照明装置では、上記のように、位置決め部材の嵌合部（導光板の位置決め用の凹部に嵌め込まれる部分）の表面のうちの少なくとも導光板の位置決め用の凹部の凹面と対向する面を弾性変形可能なクッション部材で覆うことによって、導光板が熱などの影響で膨張変形したとしても、導光板の膨張変形をクッション部材で吸収することができる。このため、導光板の位置決め用の凹部とクッション部材との間に予め空隙を設けておく必要はない。さらに、クッション部材を常に弾性変形（圧縮変形）させておくことにより、導光板が収縮変形したとしても、導光板の位置決め用の凹部とクッション部材との間に空隙が生じないようにクッション部材が復元変形する。これらのことから、導光板のガタツキが抑制され、導光板を確実に位置決めすることができる。 In the illuminating device according to the first aspect, as described above, at least the concave surface of the positioning concave portion of the light guide plate in the surface of the fitting portion of the positioning member (the portion fitted into the positioning concave portion of the light guide plate) is opposed. By covering the surface to be elastically deformable with a cushion member, even if the light guide plate is inflated and deformed by the influence of heat or the like, the expansion deformation of the light guide plate can be absorbed by the cushion member. For this reason, it is not necessary to previously provide a gap between the positioning concave portion of the light guide plate and the cushion member. Further, by always elastically deforming (compressing) the cushion member, even if the light guide plate is contracted and deformed, the cushion member is prevented from generating a gap between the positioning concave portion of the light guide plate and the cushion member. Restore and transform. From these things, rattling of the light guide plate is suppressed and the light guide plate can be positioned reliably.
　また、位置決め部材の嵌合部の表面のうちの少なくとも導光板の位置決め用の凹部の凹面と対向する面を弾性変形可能なクッション部材で覆うことによって、そのクッション部材の機能により、導光板の位置決め用の凹部と位置決め部材の嵌合部との間に発生する応力が緩和される。このため、導光板が損傷する（たとえば、導光板が割れる）などの不都合を回避することができる。 Further, by covering at least the surface of the fitting portion of the positioning member that faces the concave surface of the positioning concave portion of the light guide plate with a cushion member that can be elastically deformed, the positioning of the light guide plate is achieved by the function of the cushion member. The stress generated between the concave portion for use and the fitting portion of the positioning member is relieved. For this reason, inconveniences such as damage to the light guide plate (for example, breakage of the light guide plate) can be avoided.
　第１の局面による照明装置において、クッション部材が位置決め部材の嵌合部の表面に固着されていることが好ましい。このように構成すれば、容易に、位置決め部材の嵌合部の表面のうちの少なくとも導光板の位置決め用の凹部の凹面と対向する面がクッション部材で覆われた状態を保持し続けることができる。 In the lighting device according to the first aspect, it is preferable that the cushion member is fixed to the surface of the fitting portion of the positioning member. With this configuration, it is possible to easily maintain a state in which at least the surface of the fitting portion of the positioning member that faces the concave surface of the positioning concave portion of the light guide plate is covered with the cushion member. .
　第１の局面による照明装置において、位置決め部材が導光板の板厚方向に沿って立設されたピン状部材からなっていることが好ましい。このように構成すれば、容易に、導光板の位置決め用の凹部に位置決め部材（ピン状部材）の嵌合部を嵌め込むことができる。なお、位置決め部材となるピン状部材としては、たとえば、位置決めピンなどである。 In the illuminating device according to the first aspect, it is preferable that the positioning member is made of a pin-like member erected along the thickness direction of the light guide plate. If comprised in this way, the fitting part of a positioning member (pin-shaped member) can be easily engage | inserted in the recessed part for positioning of a light-guide plate. In addition, as a pin-shaped member used as a positioning member, it is a positioning pin etc., for example.
　位置決め部材がピン状部材からなっている構成において、位置決め部材の嵌合部の表面が全周にわたってクッション部材で覆われていることがより好ましい。このように構成すれば、位置決め部材を組み付ける際に、位置決め部材の周方向の位置を考慮する必要がなくなる。すなわち、位置決め部材の組み付け作業が簡易になる。 In a configuration in which the positioning member is a pin-shaped member, it is more preferable that the surface of the fitting portion of the positioning member is covered with a cushion member over the entire circumference. If comprised in this way, when assembling a positioning member, it becomes unnecessary to consider the position of the circumferential direction of a positioning member. That is, the assembly work of the positioning member is simplified.
　位置決め部材（ピン状部材）の嵌合部の表面が全周にわたってクッション部材で覆われている構成において、クッション部材が予め筒状に加工されており、その予め筒状に加工されたクッション部材の空洞部に位置決め部材の嵌合部が挿入されていてもよい。このように構成すれば、容易に、位置決め部材の嵌合部の表面を全周にわたってクッション部材で覆うことができる。さらに、位置決め部材の嵌合部からクッション部材が外れ難くなるので、信頼性が向上する。 In the configuration in which the surface of the fitting portion of the positioning member (pin-shaped member) is covered with the cushion member over the entire circumference, the cushion member is processed into a cylindrical shape in advance, and the cushion member processed into the cylindrical shape in advance The fitting portion of the positioning member may be inserted into the hollow portion. If comprised in this way, the surface of the fitting part of a positioning member can be easily covered with a cushion member over a perimeter. Furthermore, since the cushion member is unlikely to come off from the fitting portion of the positioning member, the reliability is improved.
　また、位置決め部材（ピン状部材）の嵌合部の表面が全周にわたってクッション部材で覆われている構成において、クッション部材がシート状であり、そのシート状のクッション部材が位置決め部材の嵌合部に巻き付けられていてもよい。このように構成すれば、クッション部材の巻き数を変更することにより、クッション部材の厚みを調整することができる。また、仮に、位置決め部材が三角柱形状や四角柱形状であったとしても、位置決め部材の嵌合部の表面を全周にわたってクッション部材で覆うのが容易となる。 Further, in the configuration in which the surface of the fitting portion of the positioning member (pin-like member) is covered with the cushion member over the entire circumference, the cushion member is a sheet shape, and the sheet-like cushion member is the fitting portion of the positioning member. It may be wound around. If comprised in this way, the thickness of a cushion member can be adjusted by changing the winding number of a cushion member. Further, even if the positioning member has a triangular prism shape or a quadrangular prism shape, it is easy to cover the surface of the fitting portion of the positioning member with the cushion member over the entire circumference.
　さらに、位置決め部材（ピン状部材）の嵌合部の表面が全周にわたってクッション部材で覆われている構成において、位置決め部材の嵌合部のピン軸方向の両端に鍔部が形成されていることが好ましい。このように構成すれば、クッション部材がピン軸方向に移動しようとしたとしても、そのクッション部材のピン軸方向の移動が位置決め部材の鍔部で規制される。このため、位置決め部材の嵌合部からクッション部材が抜け落ちるのを抑制することができる。なお、ピン軸方向とは、導光板の板厚方向と同じ方向のことである。 Further, in the configuration in which the surface of the fitting portion of the positioning member (pin-like member) is covered with the cushion member over the entire circumference, flanges are formed at both ends in the pin axis direction of the fitting portion of the positioning member. Is preferred. With this configuration, even if the cushion member tries to move in the pin axis direction, the movement of the cushion member in the pin axis direction is restricted by the flange portion of the positioning member. For this reason, it can suppress that a cushion member falls out from the fitting part of a positioning member. The pin axis direction is the same direction as the thickness direction of the light guide plate.
　本発明の第２の局面による表示装置は、第１の局面による照明装置と、その照明装置からの光で照明される表示パネルとを備えている。 The display device according to the second aspect of the present invention includes the illumination device according to the first aspect and a display panel illuminated with light from the illumination device.
　このように構成された表示装置では、導光板の損傷を抑制しながら、導光板の位置決めを確実に行うことができる。 In the display device configured as described above, the light guide plate can be reliably positioned while suppressing damage to the light guide plate.
　以上のように、本発明によれば、導光板の損傷を抑制しながら、導光板の位置決めを確実に行うことが可能な照明装置および表示装置を得ることができる。 As described above, according to the present invention, it is possible to obtain an illumination device and a display device capable of reliably positioning the light guide plate while suppressing damage to the light guide plate.
本発明の一実施形態による照明装置を備えた表示装置の分解斜視図である。It is a disassembled perspective view of the display apparatus provided with the illuminating device by one Embodiment of this invention. 本発明の一実施形態による照明装置の一部（光源の周辺部分）を拡大した断面図である。It is sectional drawing which expanded a part (peripheral part of a light source) of the illuminating device by one Embodiment of this invention. 本発明の一実施形態による照明装置を導光板の前面と対向する側から見た場合の平面図である（光学シートについては省略）。It is a top view at the time of seeing the illuminating device by one Embodiment of this invention from the side facing the front surface of a light-guide plate (it abbreviate | omits about an optical sheet). 本発明の一実施形態による照明装置のクッション部材が固着された位置決め部材の斜視図である。It is a perspective view of the positioning member to which the cushion member of the illuminating device by one Embodiment of this invention was fixed. 本発明の一実施形態による照明装置のクッション部材が固着された位置決め部材の断面図である。It is sectional drawing of the positioning member to which the cushion member of the illuminating device by one Embodiment of this invention was fixed. 本発明の一実施形態による照明装置の導光板の位置決め用の凹部（クッション部材が固着された位置決め部材）の周辺部分を拡大した図である。It is the figure which expanded the peripheral part of the recessed part for positioning (positioning member to which the cushion member was fixed) of the light-guide plate of the illuminating device by one Embodiment of this invention. 本発明の一実施形態による照明装置の位置決め部材に対するクッション部材の固着方法を説明するための図である。It is a figure for demonstrating the adhering method of the cushion member with respect to the positioning member of the illuminating device by one Embodiment of this invention. 本発明の一実施形態による照明装置の位置決め部材に対するクッション部材の固着方法を説明するための図である。It is a figure for demonstrating the adhering method of the cushion member with respect to the positioning member of the illuminating device by one Embodiment of this invention. 本発明の変形例による照明装置の導光板の位置決め用の凹部（クッション部材が固着された位置決め部材）の周辺部分を拡大した図である。It is the figure which expanded the peripheral part of the recessed part for positioning (positioning member to which the cushion member was fixed) of the light-guide plate of the illuminating device by the modification of this invention. 本発明の変形例による照明装置を導光板の前面と対向する側から見た場合の平面図である（光学シートについては省略）。It is a top view at the time of seeing the illuminating device by the modification of this invention from the side facing the front surface of a light-guide plate (it abbreviate | omits about an optical sheet). 本発明の変形例による照明装置の導光板の位置決め用の凹部（クッション部材が固着された位置決め部材）の周辺部分を拡大した図である。It is the figure which expanded the peripheral part of the recessed part for positioning (positioning member to which the cushion member was fixed) of the light-guide plate of the illuminating device by the modification of this invention. 本発明の変形例による照明装置の導光板の位置決め用の凹部（クッション部材が固着された位置決め部材）の周辺部分を拡大した図である。It is the figure which expanded the peripheral part of the recessed part for positioning (positioning member to which the cushion member was fixed) of the light-guide plate of the illuminating device by the modification of this invention.
　本発明の一実施形態による照明装置を備えた表示装置の構成について、図１～図８を参照して説明する。 The configuration of a display device including an illumination device according to an embodiment of the present invention will be described with reference to FIGS.
　この表示装置は液晶表示装置であって、図１に示すように、映像を表示する液晶表示パネル１０と、液晶表示パネル１０の表示面側とは反対の裏面側に設置されるバックライトユニット２０とを少なくとも備えている。なお、液晶表示パネル１０は、本発明の「被照明体」および「表示パネル」の一例である。また、バックライトユニット２０は、本発明の「照明装置」の一例である。 This display device is a liquid crystal display device, and as shown in FIG. 1, a liquid crystal display panel 10 for displaying an image, and a backlight unit 20 installed on the back surface side opposite to the display surface side of the liquid crystal display panel 10. And at least. The liquid crystal display panel 10 is an example of the “illuminated body” and the “display panel” in the present invention. The backlight unit 20 is an example of the “lighting device” in the present invention.
　また、液晶表示装置には筐体としてのベゼルＢＺがさらに備えられていて、そのベゼルＢＺによって、液晶表示パネル１０およびバックライトユニット２０が液晶表示パネル１０の表示面側から覆われている。 Further, the liquid crystal display device further includes a bezel BZ as a casing, and the liquid crystal display panel 10 and the backlight unit 20 are covered from the display surface side of the liquid crystal display panel 10 by the bezel BZ.
　液晶表示パネル１０は、実際に映像が表示される表示領域と、その表示領域の外縁領域である非表示領域とを有している。そして、液晶表示パネル１０の表示領域には、マトリクス状に配列された複数の画素が作り込まれている。 The liquid crystal display panel 10 has a display area where an image is actually displayed and a non-display area which is an outer edge area of the display area. A plurality of pixels arranged in a matrix are formed in the display area of the liquid crystal display panel 10.
　複数の画素のそれぞれは、スイッチング素子、画素電極および共通電極などによって駆動されるようになっている。なお、図面を見易くするため、スイッチング素子、画素電極および共通電極は図示しておらず、それらに対して電気的に接続される配線などについても図示していない。 Each of the plurality of pixels is driven by a switching element, a pixel electrode, a common electrode, and the like. Note that the switching element, the pixel electrode, and the common electrode are not shown in order to make the drawing easy to see, and wirings that are electrically connected to them are not shown.
　スイッチング素子はＴＦＴ（薄膜トランジスタ）からなっていて、スイッチング素子のゲートはゲート線（走査線）に接続され、スイッチング素子のソースはソース線（データ線）に接続される。また、スイッチング素子のドレインには画素電極が接続されるとともに、その画素電極と対向するように共通電極が配置され、さらに、画素電極と共通電極との間に液晶（図示せず）が挟持される。なお、スイッチング素子は各画素に個々に設けられており、画素電極も各画素に個々に設けられている。一方、共通電極については、その名の通り、各画素で共通となっている。 The switching element is made of a TFT (thin film transistor), the gate of the switching element is connected to a gate line (scanning line), and the source of the switching element is connected to a source line (data line). A pixel electrode is connected to the drain of the switching element, a common electrode is disposed so as to face the pixel electrode, and a liquid crystal (not shown) is sandwiched between the pixel electrode and the common electrode. The Note that the switching elements are individually provided for each pixel, and the pixel electrodes are also individually provided for each pixel. On the other hand, as the name indicates, the common electrode is common to each pixel.
　また、バックライトユニット２０は、エッジライト型であって、白色のバックライト光を面状に出射し、そのバックライト光で液晶表示パネル１０の裏面をムラなく照明するようになっている。 Further, the backlight unit 20 is of an edge light type, emits white backlight light in a planar shape, and uniformly illuminates the back surface of the liquid crystal display panel 10 with the backlight light.
　そして、表示動作の際には、映像信号に基づいて、液晶の光学的性質（光透過率）が画素毎に変化される。具体的には、各画素において、スイッチング素子を介して画素電極に所定の電力が供給されることにより、画素電極と共通電極との間に電界が発生される。そして、画素電極と共通電極との間に発生した電界によって、液晶の配向、すなわち、液晶を透過する光の透過率が変化される。 In the display operation, the optical property (light transmittance) of the liquid crystal is changed for each pixel based on the video signal. Specifically, in each pixel, an electric field is generated between the pixel electrode and the common electrode by supplying predetermined power to the pixel electrode via the switching element. The orientation of the liquid crystal, that is, the transmittance of light transmitted through the liquid crystal is changed by the electric field generated between the pixel electrode and the common electrode.
　このため、バックライトユニット２０からバックライト光が出射され、そのバックライト光によって液晶表示パネル１０の裏面が照明されると、液晶表示パネル１０を透過するバックライト光の透過量が画素毎に異ならされることになる。これにより、液晶表示パネル１０の表示面に所望の映像が表示される。 For this reason, when backlight light is emitted from the backlight unit 20 and the back surface of the liquid crystal display panel 10 is illuminated by the backlight light, the transmission amount of the backlight light transmitted through the liquid crystal display panel 10 is different for each pixel. Will be. As a result, a desired image is displayed on the display surface of the liquid crystal display panel 10.
　以下に、液晶表示パネル１０およびバックライトユニット２０の構成についてより詳細に説明する。 Hereinafter, the configuration of the liquid crystal display panel 10 and the backlight unit 20 will be described in more detail.
　液晶表示パネル１０は、図１に示すように、２枚の透明基板１１および１２を少なくとも備えている。一方の透明基板１１は、アクティブマトリクス基板と称されるものであって、他方の透明基板１２は、透明基板１１に対して対向配置されることから対向基板と称される場合もあるし、カラーフィルタ基板と称される場合もある。 The liquid crystal display panel 10 includes at least two transparent substrates 11 and 12 as shown in FIG. One transparent substrate 11 is referred to as an active matrix substrate, and the other transparent substrate 12 may be referred to as a counter substrate because it is disposed opposite to the transparent substrate 11, or a color substrate. Sometimes referred to as a filter substrate.
　一方の透明基板１１の所定面上には、スイッチング素子および画素電極が形成されているとともに、それらに電気的に接続されるゲート線（走査線）およびソース線（データ線）も形成されている。また、他方の透明基板１２の所定面上には、共通電極が形成されている。なお、他方の透明基板１２の所定面上には、共通電極に加えて、必要に応じてカラーフィルタがさらに形成される。そして、２枚の透明電極１１および１２のそれぞれの所定面は、液晶を特定方向に配向させることが可能な配向膜（図示せず）によって覆われている。 On a predetermined surface of one transparent substrate 11, a switching element and a pixel electrode are formed, and a gate line (scanning line) and a source line (data line) electrically connected to them are also formed. . A common electrode is formed on a predetermined surface of the other transparent substrate 12. In addition to the common electrode, a color filter is further formed on the predetermined surface of the other transparent substrate 12 as necessary. Each predetermined surface of the two transparent electrodes 11 and 12 is covered with an alignment film (not shown) capable of aligning the liquid crystal in a specific direction.
　また、２枚の透明基板１１および１２は、それぞれの所定面が向き合うように、シール材（図示せず）を介して互いに貼り合わされている。そして、２枚の透明基板１１および１２の間に液晶が封止されている。これによって、画素電極と共通電極との間（一方の透明基板１１の所定面を覆う配向膜と他方の透明電極１２の所定面を覆う配向膜との間）に液晶が挟持された状態となっている。 Also, the two transparent substrates 11 and 12 are bonded to each other via a seal material (not shown) so that their predetermined surfaces face each other. A liquid crystal is sealed between the two transparent substrates 11 and 12. As a result, the liquid crystal is sandwiched between the pixel electrode and the common electrode (between the alignment film covering the predetermined surface of one transparent substrate 11 and the alignment film covering the predetermined surface of the other transparent electrode 12). ing.
　さらに、２枚の透明基板１１および１２のそれぞれの外形サイズは互いに異ならされていて、透明基板１１の外形サイズが透明基板１２の外形サイズよりも大きくなっている。したがって、２枚の透明基板１１および１２は互いに貼り合わされているが、透明基板１１および１２のそれぞれの所定端は互いに合致しておらず、透明基板１１の所定面の一部が透明基板１２から露出されている。この透明基板１１の所定面の露出した部分は、非表示領域の一領域であって、透明基板１１にドライバ（図示せず）を電気的に接続するために用いられる。 Furthermore, the outer sizes of the two transparent substrates 11 and 12 are different from each other, and the outer size of the transparent substrate 11 is larger than the outer size of the transparent substrate 12. Accordingly, the two transparent substrates 11 and 12 are bonded to each other, but the predetermined ends of the transparent substrates 11 and 12 do not match each other, and a part of the predetermined surface of the transparent substrate 11 is separated from the transparent substrate 12. Exposed. The exposed portion of the predetermined surface of the transparent substrate 11 is a region of a non-display area, and is used for electrically connecting a driver (not shown) to the transparent substrate 11.
　また、２枚の透明基板１１および１２の所定面（液晶側の面）とは反対側の面のそれぞれには、特定の振動方向の光波だけを透過させる偏光シート１３が１枚ずつ貼付されている。そして、２枚の偏光シート１３のそれぞれの透過軸方向は、互いに約９０°ずらされている。 In addition, a polarizing sheet 13 that transmits only light waves in a specific vibration direction is attached to each of the surfaces of the two transparent substrates 11 and 12 opposite to the predetermined surfaces (surfaces on the liquid crystal side). Yes. The transmission axis directions of the two polarizing sheets 13 are shifted from each other by about 90 °.
　この液晶表示パネル１０の裏面側に設置されるバックライトユニット２０は、図１および図２に示すように、バックシャーシ２１と、反射シート２２と、導光板２３と、光学シート２４と、光源モジュール２５とを少なくとも備えている。なお、バックシャーシ２１は、本発明の「筐体」の一例である。 As shown in FIGS. 1 and 2, the backlight unit 20 installed on the back side of the liquid crystal display panel 10 includes a back chassis 21, a reflection sheet 22, a light guide plate 23, an optical sheet 24, and a light source module. 25. The back chassis 21 is an example of the “housing” in the present invention.
　バックシャーシ２１は、液晶表示パネル１０側が開口された略箱状に形成されている。すなわち、バックシャーシ２１は、底部と、その底部の外周に立設された側部とを有していることになる。そして、バックシャーシ２１の底部および側部で取り囲まれた領域が収容領域とされており、そのバックシャーシ２１の収容領域内に、反射シート２２、導光板２３、光学シート２４および光源モジュール２５が収容される。 The back chassis 21 is formed in a substantially box shape with the liquid crystal display panel 10 side opened. That is, the back chassis 21 has a bottom portion and side portions erected on the outer periphery of the bottom portion. An area surrounded by the bottom and sides of the back chassis 21 is an accommodation area, and the reflection sheet 22, the light guide plate 23, the optical sheet 24, and the light source module 25 are accommodated in the accommodation area of the back chassis 21. Is done.
　反射シート２２は、バックシャーシ２１の底部の内面（底面）上に載置されている。すなわち、この反射シート２２の存在によって、バックシャーシ２１の底部の内面が光反射面となっている。 The reflection sheet 22 is placed on the inner surface (bottom surface) of the bottom of the back chassis 21. That is, due to the presence of the reflection sheet 22, the inner surface of the bottom portion of the back chassis 21 is a light reflection surface.
　導光板２３は、光源モジュール２５からの光を導入して液晶表示パネル１０側に向けて出射するためのものであって、前面２３ａおよびその反対面である後面２３ｂと、前面２３ａおよび後面２３ｂに繋がる複数の側端面とを有しているとともに、バックシャーシ２１の底部の内面上に反射シート２２を介して載置されている。そして、導光板２３の前面２３ａが液晶表示パネル１０側に向けられ、導光板２３の後面２３ｂがバックシャーシ２１の底部側に向けられている。 The light guide plate 23 introduces light from the light source module 25 and emits the light toward the liquid crystal display panel 10 side. The light guide plate 23 is formed on the front surface 23a and the rear surface 23b opposite to the front surface 23a, and on the front surface 23a and the rear surface 23b. The plurality of side end surfaces are connected to each other, and are placed on the inner surface of the bottom portion of the back chassis 21 via the reflection sheet 22. The front surface 23 a of the light guide plate 23 is directed toward the liquid crystal display panel 10, and the rear surface 23 b of the light guide plate 23 is directed toward the bottom side of the back chassis 21.
　これにより、導光板２３の前面２３ａは、導光板２３内に導入された光（光源モジュール２５からの光）を液晶表示パネル１０側に向けて出射するための光出射面となる。一方で、導光板２３の後面２３ｂは、反射シート２２によって覆われるため、光出射面とはならない。 Thereby, the front surface 23a of the light guide plate 23 becomes a light emitting surface for emitting light introduced into the light guide plate 23 (light from the light source module 25) toward the liquid crystal display panel 10 side. On the other hand, since the rear surface 23b of the light guide plate 23 is covered with the reflection sheet 22, it does not become a light emission surface.
　また、図３に示すように、導光板２３の前面２３ａと対向する側からの平面視においては、導光板２３の外形形状（前面２３ａおよび後面２３ｂの平面形状）は略長方形状となっている。すなわち、この導光板２３は、４つの側端面２３ｃ～２３ｆを有している。そして、導光板２３の４つの側端面２３ｃ～２３ｆのうちの側端面２３ｃは、光源モジュール２５からの光が入射する光入射面となっている。このため、導光板２３の側端面（光入射面）２３ｃを介して、光源モジュール２５からの光が導光板２３内に導入される。 As shown in FIG. 3, the outer shape of the light guide plate 23 (planar shape of the front surface 23 a and the rear surface 23 b) is substantially rectangular in a plan view from the side facing the front surface 23 a of the light guide plate 23. . That is, the light guide plate 23 has four side end faces 23c to 23f. Of the four side end surfaces 23c to 23f of the light guide plate 23, the side end surface 23c is a light incident surface on which light from the light source module 25 is incident. For this reason, the light from the light source module 25 is introduced into the light guide plate 23 through the side end surface (light incident surface) 23 c of the light guide plate 23.
　なお、導光板２３の側端面２３ｃおよび２３ｄは、互いに逆方向を向き、かつ、平面視における導光板２３の長手方向（Ｘ方向）に平行になっている面である。また、導光板２３の側端面２３ｅおよび２３ｆは、互いに逆方向を向き、かつ、平面視における導光板２３の短手方向（Ｙ方向）に平行になっている面である。 The side end surfaces 23c and 23d of the light guide plate 23 are surfaces that face in opposite directions and are parallel to the longitudinal direction (X direction) of the light guide plate 23 in plan view. Further, the side end surfaces 23e and 23f of the light guide plate 23 are surfaces facing in opposite directions to each other and parallel to the short direction (Y direction) of the light guide plate 23 in plan view.
　また、図１および図２に示す光学シート２４は、拡散シートやレンズシートなどを含んでおり、導光板２３の前面（光出射面）２３ａ上に載置されている。そして、この光学シート２４によって、導光板２３の前面（光出射面）２３ａから出射された光の拡散や集光などが行われる。なお、光学シート２４の種類や使用枚数については、用途に応じて適宜変更される。 The optical sheet 24 shown in FIGS. 1 and 2 includes a diffusion sheet, a lens sheet, and the like, and is placed on the front surface (light emitting surface) 23a of the light guide plate 23. The optical sheet 24 diffuses or collects light emitted from the front surface (light emitting surface) 23a of the light guide plate 23. The type and the number of sheets used of the optical sheet 24 are appropriately changed according to the application.
　光源モジュール２５は、バックライト光の基となる光（導光板２３内に導入される光）を生成するためのものであって、導光板２３の側端面（光入射面）２３ｃの側に配置されている。なお、光源モジュール２５の使用数は特に限定されるものではない。たとえば、図示しないが、光源モジュール２５をさらに追加し、その追加した光源モジュール２５を導光板２３の側端面２３ｄの側に配置するようにしてもよい。言い換えると、導光板２３の側端面２３ｃに加えて、導光板２３の側端面２３ｄについても光入射面として機能させてもよい。 The light source module 25 is for generating light (light introduced into the light guide plate 23) as a base of backlight light, and is disposed on the side end surface (light incident surface) 23c side of the light guide plate 23. Has been. The number of light source modules 25 used is not particularly limited. For example, although not shown, the light source module 25 may be further added, and the added light source module 25 may be disposed on the side end face 23 d side of the light guide plate 23. In other words, in addition to the side end surface 23c of the light guide plate 23, the side end surface 23d of the light guide plate 23 may also function as a light incident surface.
　光源モジュール２５の構造としては、同一のプリント基板２６の実装面２６ａに複数のＬＥＤ２７が実装されたものとなっている。なお、ＬＥＤ２７の実装数は特に限定されるものではなく、用途に応じて変更可能である。 The light source module 25 has a structure in which a plurality of LEDs 27 are mounted on a mounting surface 26a of the same printed circuit board 26. Note that the number of LEDs 27 mounted is not particularly limited, and can be changed according to the application.
　プリント基板２６は、短冊状に形成されたＦＰＣ（フレキシブルプリント配線板）などからなっていて、その実装面２６ａが導光板２３の側端面（光入射面）２３ｃと向き合うように保持されている。このため、プリント基板２６の実装面２６ａに実装されたＬＥＤ２７も導光板２３の側端面（光入射面）２３ｃと対向することになる。これにより、ＬＥＤ２７から光が発せられると、その光が導光板２３の側端面（光入射面）２３ｃに入射して導光板２３内に導入される。 The printed circuit board 26 is made of an FPC (flexible printed wiring board) formed in a strip shape, and the mounting surface 26a is held so as to face the side end surface (light incident surface) 23c of the light guide plate 23. For this reason, the LED 27 mounted on the mounting surface 26 a of the printed circuit board 26 also faces the side end surface (light incident surface) 23 c of the light guide plate 23. Accordingly, when light is emitted from the LED 27, the light enters the side end face (light incident surface) 23 c of the light guide plate 23 and is introduced into the light guide plate 23.
　ＬＥＤ２７は白色ＬＥＤであって、たとえば、青色（青紫色）のＬＥＤ光を黄色に変換する蛍光体と青色ＬＥＤ（青紫色ＬＥＤ）とを組み合わせたものである。なお、青色（青紫色）のＬＥＤ光を緑色および赤色にそれぞれ変換する蛍光体と青色ＬＥＤ（青紫色ＬＥＤ）とを組み合わせたものをＬＥＤ２７としてもよく、青色ＬＥＤ、緑色ＬＥＤおよび赤色ＬＥＤの３種類のＬＥＤを組み合わせたものをＬＥＤ２７としてもよい。 The LED 27 is a white LED, for example, a combination of a phosphor that converts blue (blue-violet) LED light into yellow and a blue LED (blue-violet LED). Note that a combination of a phosphor that converts blue (blue-violet) LED light into green and red and a blue LED (blue-violet LED) may be used as LED 27, and three types of blue LED, green LED, and red LED may be used. It is good also as what combined LED of LED27.
　ところで、光源モジュール２５からの光を導光板２３の側端面（光入射面）２３ｃに効率的に入射させるためには、バックシャーシ２１の収容領域内において導光板２３を精度良く位置決めしておくことが必要となる。 By the way, in order to make the light from the light source module 25 incident on the side end surface (light incident surface) 23c of the light guide plate 23 efficiently, the light guide plate 23 must be accurately positioned in the accommodation region of the back chassis 21. Is required.
　したがって、本実施形態では、バックシャーシ２１の底部に２本の位置決めピン３１を取り付け、その位置決めピン３１を用いてバックシャーシ２１の収容領域内における導光板２３の位置決めを精度良く行うようにしている。なお、位置決めピン３１は、本発明の「位置決め部材」および「ピン状部材」の一例である。 Therefore, in the present embodiment, the two positioning pins 31 are attached to the bottom of the back chassis 21, and the positioning of the light guide plate 23 in the accommodation area of the back chassis 21 is performed with high accuracy using the positioning pins 31. . The positioning pin 31 is an example of the “positioning member” and “pin-shaped member” in the present invention.
　この位置決めピン３１は、図３～図５に示すように、導光板２３の側端面２３ｅおよび２３ｆのそれぞれの側に１本ずつ配置されているとともに、バックシャーシ２１の底部から収容領域内に向かう方向（導光板２３の板厚方向）に沿って延びるように立設されている。なお、位置決めピン３１の構成材料および形状は特に限定されるものではないが、たとえば、位置決めピン３１の構成材料としてはアルミニウムやステンレスなどの金属が用いられ、位置決めピン３１の形状としては略円柱形状とされる。 As shown in FIGS. 3 to 5, one positioning pin 31 is disposed on each side of the side end faces 23e and 23f of the light guide plate 23 and is directed from the bottom of the back chassis 21 into the accommodation area. It is erected so as to extend along the direction (the thickness direction of the light guide plate 23). The constituent material and shape of the positioning pin 31 are not particularly limited. For example, a metal such as aluminum or stainless steel is used as the constituent material of the positioning pin 31, and the positioning pin 31 has a substantially cylindrical shape. It is said.
　また、図３および図６に示すように、導光板２３の側端面２３ｅおよび２３ｆのそれぞれには、位置決め用の凹部（切り欠き部）２３ｇが１つずつ形成されている。この導光板２３の凹部２３ｇが形成された側端面２３ｅおよび２３ｆは、本発明の「所定の側端面」の一例である。なお、図１に示すように、反射シート２２にも、導光板２３の凹部２３ｇと同様の凹部２２ａが形成されている。 Further, as shown in FIGS. 3 and 6, each of the side end faces 23 e and 23 f of the light guide plate 23 is formed with a positioning recess (notch) 23 g. The side end surfaces 23e and 23f in which the concave portion 23g of the light guide plate 23 is formed are an example of the “predetermined side end surface” in the present invention. As shown in FIG. 1, the reflective sheet 22 is also formed with a recess 22 a similar to the recess 23 g of the light guide plate 23.
　導光板２３の側端面２３ｅに形成された凹部２３ｇは、図３および図６に示すように、側端面２３ｅの表面からＸ方向の一方向（側端面２３ｅから側端面２３ｆに向かう方向）にＵ字状に切り込まれた切り欠きからなっているとともに、側端面２３ｅのＹ方向における中心部に配置されている。同様に、導光板２３の側端面２３ｆに形成された凹部２３ｇは、側端面２３ｆの表面からＸ方向の一方向とは反対の他方向（側端面２３ｆから側端面２３ｅに向かう方向）にＵ字状に切り込まれた切り欠きからなっているとともに、側端面２３ｆのＹ方向における中心部に配置されている。なお、導光板２３の前面２３ａと対向する側から平面的に見ると、導光板２３の凹部２３ｇは、開口形状が略半円形状とされた貫通穴に相当する。 As shown in FIGS. 3 and 6, the recess 23 g formed on the side end surface 23 e of the light guide plate 23 is U-shaped in one direction in the X direction from the surface of the side end surface 23 e (the direction from the side end surface 23 e to the side end surface 23 f). It consists of a notch cut into a letter shape and is arranged at the center of the side end face 23e in the Y direction. Similarly, the recess 23g formed on the side end face 23f of the light guide plate 23 is U-shaped in the other direction opposite to one direction in the X direction from the surface of the side end face 23f (the direction from the side end face 23f toward the side end face 23e). And is arranged at the center of the side end face 23f in the Y direction. Note that when viewed in plan from the side facing the front surface 23a of the light guide plate 23, the recess 23g of the light guide plate 23 corresponds to a through-hole whose opening shape is a substantially semicircular shape.
　そして、導光板２３の凹部２３ｇに位置決めピン３１の所定部分（以下、嵌合部３１ａと言う）が嵌め込まれ、それによって、導光板２３のＸ方向およびＹ方向への移動（位置ずれ）が規制されている。すなわち、導光板２３のＸ方向およびＹ方向における位置決めがなされている。 A predetermined portion of the positioning pin 31 (hereinafter referred to as a fitting portion 31a) is fitted into the recess 23g of the light guide plate 23, thereby restricting movement (positional deviation) of the light guide plate 23 in the X direction and the Y direction. Has been. That is, the light guide plate 23 is positioned in the X direction and the Y direction.
　ここで、本実施形態では、位置決めピン３１の嵌合部３１ａの表面（周面）のうちの少なくとも導光板２３の凹部２３ｇの凹面（内壁）と対向する面をクッション部材３２で覆うことによって、導光板２３の凹部２３ｇと位置決めピン３１の嵌合部３１ａとの間にクッション部材３２が挟み込まれた状態にしている。言い換えると、クッション部材３２によって、導光板２３の凹部２３ｇと位置決めピン３１の嵌合部３１ａとの間の空隙が略埋められた状態にしている。このクッション部材３２の構成材料は特に限定されないが、たとえば、ウレタンやスポンジなどの弾性変形可能なクッション材である。 Here, in this embodiment, by covering at least the surface of the fitting portion 31a of the positioning pin 31 that faces the concave surface (inner wall) of the concave portion 23g of the light guide plate 23 with the cushion member 32, The cushion member 32 is sandwiched between the concave portion 23 g of the light guide plate 23 and the fitting portion 31 a of the positioning pin 31. In other words, the gap between the concave portion 23 g of the light guide plate 23 and the fitting portion 31 a of the positioning pin 31 is substantially filled with the cushion member 32. Although the constituent material of this cushion member 32 is not specifically limited, For example, it is a cushion material which can be elastically deformed, such as urethane and sponge.
　したがって、本実施形態では、位置決めピン３１の嵌合部３１ａは導光板２３の凹部２３ｇの凹面には接触しておらず、クッション部材３２が導光板２３の凹部２３ｇの凹面の略全面に常に接触している。すなわち、Ｘ方向およびＹ方向のそれぞれにおいて、導光板２３の凹部２３ｇの凹面とクッション部材３２との間に空隙が存在しない。なお、図６では、図面を見易くするために、導光板２３の凹部２３ｇの凹面からクッション部材３２を離間させているが、実際には、クッション部材３２が導光板２３の凹部２３ｇの凹面に接触している。 Therefore, in the present embodiment, the fitting portion 31a of the positioning pin 31 is not in contact with the concave surface of the concave portion 23g of the light guide plate 23, and the cushion member 32 is always in contact with substantially the entire concave surface of the concave portion 23g of the light guide plate 23. is doing. That is, there is no gap between the concave surface of the concave portion 23 g of the light guide plate 23 and the cushion member 32 in each of the X direction and the Y direction. In FIG. 6, in order to make the drawing easy to see, the cushion member 32 is separated from the concave surface of the concave portion 23 g of the light guide plate 23, but actually, the cushion member 32 contacts the concave surface of the concave portion 23 g of the light guide plate 23. is doing.
　この構成を実現するため、本実施形態では、位置決めピン３１の嵌合部３１ａの表面に全周にわたってクッション部材３２を固着し、それによって、位置決めピン３１の嵌合部３１ａの表面が全周にわたってクッション部材３２で覆われた状態（円筒状のクッション部材３２の空洞部３２ａに位置決めピン３１の嵌合部３１ａが挿入された状態）にしている。これにより、導光板２３の凹部２３ｇに位置決めピン３１の嵌合部３１ａを嵌め込めば、導光板２３の凹部２３ｇと位置決めピン３１の嵌合部３１ａとの間にクッション部材３２が挟み込まれ、導光板２３の凹部２３ｇと位置決めピン３１の嵌合部３１ａとの間の空隙がクッション部材３２によって略埋められる。 In order to realize this configuration, in the present embodiment, the cushion member 32 is fixed to the entire surface of the fitting portion 31a of the positioning pin 31 so that the surface of the fitting portion 31a of the positioning pin 31 extends over the entire periphery. It is in a state covered with the cushion member 32 (a state in which the fitting portion 31a of the positioning pin 31 is inserted into the hollow portion 32a of the cylindrical cushion member 32). As a result, when the fitting portion 31a of the positioning pin 31 is fitted into the recess 23g of the light guide plate 23, the cushion member 32 is sandwiched between the recess 23g of the light guide plate 23 and the fitting portion 31a of the positioning pin 31, thereby A gap between the concave portion 23 g of the optical plate 23 and the fitting portion 31 a of the positioning pin 31 is substantially filled with the cushion member 32.
　そして、位置決めピン３１の嵌合部３１ａの表面に固着されたクッション部材３２は、導光板２３の凹部２３ｇと位置決めピン３１の嵌合部３１ａとの間に挟み込まれることによって弾性変形（圧縮変形）されている。このため、導光板２３の凹部２３ｇの凹面を押圧するような付勢力がクッション部材３２に常に発生している。 The cushion member 32 fixed to the surface of the fitting portion 31a of the positioning pin 31 is elastically deformed (compressed) by being sandwiched between the concave portion 23g of the light guide plate 23 and the fitting portion 31a of the positioning pin 31. Has been. Therefore, an urging force that presses the concave surface of the concave portion 23 g of the light guide plate 23 is always generated in the cushion member 32.
　また、図４および図５に示すように、位置決めピン３１の嵌合部３１ａのピン軸方向（Ｚ方向）の両端には、それぞれ、位置決めピン３１の嵌合部３１ａの外径よりも大きい外径を持つ鍔部３１ｂが形成されている。すなわち、位置決めピン３１の嵌合部３１ａが小径部とされているとともに、位置決めピン３１の嵌合部３１ａのＺ方向の両端部が大径部とされており、それによって、位置決めピン３１の嵌合部３１ａのＺ方向の両端に段差が生じている。そして、位置決めピン３１の嵌合部３１ａの表面に固着されたクッション部材３２は、位置決めピン３１の鍔部３１ｂによって、Ｚ方向に移動しないように規制されている。 Further, as shown in FIGS. 4 and 5, both ends of the fitting portion 31a of the positioning pin 31 in the pin axial direction (Z direction) are respectively larger than the outer diameter of the fitting portion 31a of the positioning pin 31. A flange portion 31b having a diameter is formed. That is, the fitting portion 31a of the positioning pin 31 is a small diameter portion, and both end portions in the Z direction of the fitting portion 31a of the positioning pin 31 are large diameter portions. Steps are formed at both ends in the Z direction of the joint portion 31a. The cushion member 32 fixed to the surface of the fitting portion 31 a of the positioning pin 31 is restricted by the flange portion 31 b of the positioning pin 31 from moving in the Z direction.
　位置決めピン３１の嵌合部３１ａの表面に対するクッション部材３２の固着方法は特に限定されないが、たとえば、図７に示すように、予め円筒状に加工されたクッション部材３２を準備し、その円筒状のクッション部材３２の空洞部（円形状の開口を持つ穴部）３２ａに位置決めピン３１の嵌合部３１ａを挿入するようにしてもよい。 The method of fixing the cushion member 32 to the surface of the fitting portion 31a of the positioning pin 31 is not particularly limited. For example, as shown in FIG. 7, a cushion member 32 that has been processed into a cylindrical shape in advance is prepared, and the cylindrical member The fitting portion 31a of the positioning pin 31 may be inserted into the hollow portion (hole portion having a circular opening) 32a of the cushion member 32.
　また、別の方法として、図８に示すように、シート状のクッション部材３２を準備し、そのシート状のクッション部材３２を位置決めピン３１の嵌合部３１ａに全周にわたって巻き付けるようにしてもよい。 As another method, as shown in FIG. 8, a sheet-like cushion member 32 may be prepared, and the sheet-like cushion member 32 may be wound around the fitting portion 31 a of the positioning pin 31 over the entire circumference. .
　本実施形態では、上記のように、位置決めピン３１の嵌合部３１ａの表面のうちの少なくとも導光板２３の凹部２３ｇの凹面と対向する面を弾性変形可能なクッション部材３２で覆うことによって、導光板２３が熱の影響で膨張変形したとしても、導光板２３の膨張変形をクッション部材３２で吸収することができる。このため、導光板２３の凹部２３ｇとクッション部材３２との間に予め空隙を設けておく必要はない。さらに、クッション部材３２を常に弾性変形（圧縮変形）させておくことにより、導光板２３が収縮変形したとしても、導光板２３の凹部２３ｇとクッション部材３２との間に空隙が生じないようにクッション部材３２が復元変形する。これらのことから、導光板２３のガタツキが抑制されるので、導光板２３を確実に位置決めすることができる。 In the present embodiment, as described above, at least the surface of the fitting portion 31a of the positioning pin 31 that faces the concave surface of the concave portion 23g of the light guide plate 23 is covered with the elastically deformable cushion member 32, thereby introducing a guide. Even if the light plate 23 expands and deforms due to the influence of heat, the cushion member 32 can absorb the expansion and deformation of the light guide plate 23. For this reason, it is not necessary to provide a gap between the recess 23g of the light guide plate 23 and the cushion member 32 in advance. Further, the cushion member 32 is always elastically deformed (compressed), so that even if the light guide plate 23 is contracted and deformed, the cushion is formed so that no gap is generated between the recess 23g of the light guide plate 23 and the cushion member 32. The member 32 is restored and deformed. From these things, since the shakiness of the light-guide plate 23 is suppressed, the light-guide plate 23 can be positioned reliably.
　また、位置決めピン３１の嵌合部３１ａの表面のうちの少なくとも導光板２３の凹部２３ｇの凹面と対向する面を弾性変形可能なクッション部材３２で覆えば、そのクッション部材３２の機能により、導光板２３の凹部２３ｇと位置決めピン３１の嵌合部３１ａとの間に発生する応力が緩和される。したがって、導光板２３が損傷する（たとえば、導光板２３が割れる）などの不都合を回避することができる。 Further, if at least the surface of the fitting portion 31a of the positioning pin 31 that faces the concave surface of the concave portion 23g of the light guide plate 23 is covered with an elastically deformable cushion member 32, the light guide plate can be obtained by the function of the cushion member 32. The stress generated between the recess 23g of the 23 and the fitting portion 31a of the positioning pin 31 is relieved. Therefore, inconveniences such as damage to the light guide plate 23 (for example, the light guide plate 23 breaks) can be avoided.
　また、本実施形態では、上記のように、位置決めピン３１の嵌合部３１ａの表面にクッション部材３２を固着することによって、容易に、位置決めピン３１の嵌合部３１ａの表面のうちの少なくとも導光板２３の凹部２３ｇの凹面と対向する面がクッション部材３２で覆われた状態を保持し続けることができる。 Further, in the present embodiment, as described above, by attaching the cushion member 32 to the surface of the fitting portion 31a of the positioning pin 31, it is possible to easily guide at least the surface of the fitting portion 31a of the positioning pin 31. It is possible to keep the state where the surface of the optical plate 23 facing the concave surface of the concave portion 23g is covered with the cushion member 32.
　また、本実施形態では、上記のように、位置決めピン３１の嵌合部３１ａの表面を全周にわたってクッション部材３２で覆うことによって、位置決めピン３１をバックシャーシ２１の底部に取り付ける際に、位置決めピン３１の周方向の位置を考慮する必要がなくなる。すなわち、バックシャーシ２１の底部に対する位置決めピン３１の取り付け作業が簡易になる。 In the present embodiment, as described above, when the positioning pin 31 is attached to the bottom of the back chassis 21 by covering the surface of the fitting portion 31a of the positioning pin 31 with the cushion member 32 over the entire circumference, There is no need to consider the circumferential position of 31. That is, the attaching operation of the positioning pins 31 to the bottom portion of the back chassis 21 is simplified.
　また、本実施形態では、上記のように、位置決めピン３１の嵌合部３１ａのＺ方向の両端に鍔部３１ｂを形成することによって、クッション部材３２がＺ方向に移動しようとしたとしても、そのクッション部材３２の移動が位置決めピン３１の鍔部３１ｂで規制される。このため、位置決めピン３１の嵌合部３１ａからクッション部材３２が抜け落ちるのを抑制することができる。 Further, in the present embodiment, as described above, even if the cushion member 32 attempts to move in the Z direction by forming the flange portions 31b at both ends in the Z direction of the fitting portion 31a of the positioning pin 31, The movement of the cushion member 32 is restricted by the flange 31 b of the positioning pin 31. For this reason, it can suppress that the cushion member 32 falls out from the fitting part 31a of the positioning pin 31. FIG.
　また、本実施形態では、上記のように、導光板２３に形成する凹部２３ｇの形状をＵ字形状とすることによって、導光板２３の加工時間が短縮されるので、導光板２３の加工作業の効率を高めることができる。 Moreover, in this embodiment, since the processing time of the light-guide plate 23 is shortened by making the shape of the recessed part 23g formed in the light-guide plate 23 into a U shape as mentioned above, the processing operation of the light-guide plate 23 is carried out. Efficiency can be increased.
　また、位置決めピン３１の嵌合部３１ａの表面に対するクッション部材３２の固着方法として、予め円筒状に加工されたクッション部材３２を準備し、その円筒状のクッション部材３２の空洞部３２ａに位置決めピン３１の嵌合部３１ａを挿入するという方法を採用する場合には、容易に、位置決めピン３１の嵌合部３１ａの表面を全周にわたってクッション部材３２で覆うことができる。さらに、位置決めピン３１の嵌合部３１ａからクッション部材３２が外れ難くなり、信頼性が向上する。 Further, as a method of fixing the cushion member 32 to the surface of the fitting portion 31 a of the positioning pin 31, a cushion member 32 that has been processed into a cylindrical shape is prepared in advance, and the positioning pin 31 is inserted into the hollow portion 32 a of the cylindrical cushion member 32. When the method of inserting the fitting part 31a is employed, the surface of the fitting part 31a of the positioning pin 31 can be easily covered with the cushion member 32 over the entire circumference. Furthermore, it becomes difficult for the cushion member 32 to come off from the fitting portion 31a of the positioning pin 31, and the reliability is improved.
　その一方、シート状のクッション部材３２を準備し、そのシート状のクッション部材３２を位置決めピン３１の嵌合部３１ａに全周にわたって巻き付けるという方法を採用する場合には、クッション部材３２の巻き数を変更することにより、クッション部材３２の厚みを調整することができる。また、仮に、位置決めピン３１が三角柱形状や四角柱形状であったとしても、位置決めピン３１の嵌合部３１ａの表面を全周にわたってクッション部材３２で覆うのが容易となる。 On the other hand, when the sheet-like cushion member 32 is prepared and the method of winding the sheet-like cushion member 32 around the fitting portion 31a of the positioning pin 31 over the entire circumference is adopted, the number of turns of the cushion member 32 is set. By changing, the thickness of the cushion member 32 can be adjusted. Even if the positioning pin 31 has a triangular prism shape or a quadrangular prism shape, it is easy to cover the surface of the fitting portion 31a of the positioning pin 31 with the cushion member 32 over the entire circumference.
　今回開示された実施形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and includes all modifications within the meaning and scope equivalent to the scope of claims for patent.
　たとえば、上記実施形態では、位置決めピン３１の嵌合部３１ａの表面を全周にわたってクッション部材３２で覆うようにしたが、本発明はこれに限らず、図９に示すように、位置決めピン３１の嵌合部３１ａの表面のうち、導光板２３の凹部２３ｇの凹面と対向する面のみをクッション部材３２で覆い、それ以外の面についてはクッション部材３２で覆わないようにしてもよい。なお、図９では、図面を見易くするために、導光板２３の凹部２３ｇの凹面からクッション部材３２を離間させているが、実際には、クッション部材３２が導光板２３の凹部２３ｇの凹面に接触している。 For example, in the above embodiment, the surface of the fitting portion 31a of the positioning pin 31 is covered with the cushion member 32 over the entire circumference. However, the present invention is not limited to this, and as shown in FIG. Of the surface of the fitting portion 31a, only the surface facing the concave surface of the concave portion 23g of the light guide plate 23 may be covered with the cushion member 32, and the other surfaces may not be covered with the cushion member 32. In FIG. 9, in order to make the drawing easy to see, the cushion member 32 is separated from the concave surface of the concave portion 23 g of the light guide plate 23, but actually, the cushion member 32 contacts the concave surface of the concave portion 23 g of the light guide plate 23. is doing.
　また、上記実施形態では、導光板２３の４つの側端面２３ｃ～２３ｆのうちの互いに平行な側端面２３ｅおよび２３ｆのそれぞれに凹部２３ｇを形成したが、本発明はこれに限らず、図１０に示すように、導光板２３の側端面２３ｅと、その側端面２３ｅとの間で直角をなす側端面２３ｄとに凹部２３ｇを形成してもよい。なお、この場合には、導光板２３の側端面２３ｄおよび２３ｅが本発明の「所定の側端面」に相当する。 In the above embodiment, the recesses 23g are formed in the side end surfaces 23e and 23f parallel to each other among the four side end surfaces 23c to 23f of the light guide plate 23. However, the present invention is not limited to this, and FIG. As shown, a recess 23g may be formed on the side end surface 23e of the light guide plate 23 and a side end surface 23d that forms a right angle with the side end surface 23e. In this case, the side end surfaces 23d and 23e of the light guide plate 23 correspond to “predetermined side end surfaces” of the present invention.
　もちろん、図示しないが、導光板２３の互いに直角をなす側端面２３ｆおよび２３ｄのそれぞれに凹部２３ｇを形成するようにしてもよい。その一方、導光板２３の側端面２３ｃは光入射面として機能させているため、導光板２３の側端面２３ｃには凹部２３ｇを形成しない方が好ましい。 Of course, although not shown, the recess 23g may be formed on each of the side end faces 23f and 23d of the light guide plate 23 that are perpendicular to each other. On the other hand, since the side end surface 23c of the light guide plate 23 functions as a light incident surface, it is preferable not to form the recess 23g on the side end surface 23c of the light guide plate 23.
　また、上記実施形態では、導光板２３の側端面２３ｅ（２３ｆ）の表面からＵ字状（略半円形状）に切り込まれた切り欠きを凹部２３ｇとしたが、本発明はこれに限らず、図１１に示すように、導光板２３の側端面２３ｅ（２３ｆ）の表面から四角形状に切り込まれた切り欠きを凹部２３ｇとしてもよいし、図１２に示すように、導光板２３の側端面２３ｅ（２３ｆ）の表面から三角形状に切り込まれた切り欠きを凹部２３ｇとしてもよい。ただし、加工を容易にするのであれば、導光板２３の側端面２３ｅ（２３ｆ）の表面からＵ字状（略半円形状）に切り込まれた切り欠きを凹部２３ｇとするのが好ましい。 Moreover, in the said embodiment, although the notch cut into U shape (substantially semicircle shape) from the surface of the side end surface 23e (23f) of the light-guide plate 23 was set as the recessed part 23g, this invention is not limited to this. As shown in FIG. 11, a notch cut into a square shape from the surface of the side end face 23e (23f) of the light guide plate 23 may be a recess 23g, or the side of the light guide plate 23 as shown in FIG. A notch cut in a triangular shape from the surface of the end face 23e (23f) may be used as the recess 23g. However, in order to facilitate the processing, it is preferable that a notch cut into a U shape (substantially semicircular shape) from the surface of the side end face 23e (23f) of the light guide plate 23 is the recess 23g.
　また、上記実施形態では、バックシャーシ２１とは異なる部材である位置決めピン３１を用いて導光板２３を位置決めするようにしたが、本発明はこれに限らず、たとえば、図示しないが、バックシャーシ２１に一体的に形成した位置決め用の凸部を用いて導光板２３を位置決めするようにしてもよい、すなわち、本発明の「位置決め部材」に相当する部材が位置決めピン３１でなくてもよい。 In the above embodiment, the light guide plate 23 is positioned using the positioning pins 31 which are members different from the back chassis 21. However, the present invention is not limited to this, for example, the back chassis 21 is not shown. The light guide plate 23 may be positioned by using a positioning projection formed integrally with the positioning pin 31, that is, the member corresponding to the “positioning member” of the present invention may not be the positioning pin 31.
　また、上記実施形態では、バックライトユニット２０の光源としてＬＥＤ２７を用いたが、本発明はこれに限らず、冷陰極管などをバックライトユニット２０の光源としてもよい。 In the above embodiment, the LED 27 is used as the light source of the backlight unit 20, but the present invention is not limited to this, and a cold cathode tube or the like may be used as the light source of the backlight unit 20.
　また、上記実施形態では、液晶表示装置に本発明を適用する例について説明したが、本発明はこれに限らず、液晶表示装置以外の表示装置に本発明を適用してもよい。 In the above embodiment, the example in which the present invention is applied to the liquid crystal display device has been described. However, the present invention is not limited to this, and the present invention may be applied to display devices other than the liquid crystal display device.
　　１０　液晶表示パネル（表示パネル）
　　２０　バックライトユニット（照明装置）
　　２１　バックシャーシ（筐体）
　　２３　導光板
　　２３ａ　前面
　　２３ｂ　後面
　　２３ｃ、２３ｄ、２３ｅ、２３ｆ　側端面
　　３１　位置決めピン（位置決め部材、ピン状部材）
　　３１ａ　嵌合部
　　３１ｂ　鍔部
　　３２　クッション部材
　　３２ａ　空洞部 10 Liquid crystal display panel (display panel)
20 Backlight unit (lighting device)
21 Back chassis (housing)
23 light guide plate 23a front surface 23b rear surface 23c, 23d, 23e, 23f side end surface 31 positioning pin (positioning member, pin-shaped member)
31a fitting part 31b collar part 32 cushion member 32a hollow part

Claims (8)

  1. 　筐体と、
    　前記筐体に収容され、被照明体側に向くことになる前面および前記前面の反対面である後面と、前記前面および前記後面に繋がる複数の側端面とを有するとともに、前記複数の側端面のうちの所定の側端面に位置決め用の凹部が形成された導光板と、
    　前記導光板の位置決め用の凹部に嵌め込まれる嵌合部を有する位置決め部材とを備え、
    　前記位置決め部材の嵌合部の表面のうちの少なくとも前記導光板の位置決め用の凹部の凹面と対向する面が弾性変形可能なクッション部材で覆われていることを特徴とする照明装置。     A housing,
    The front surface that is housed in the housing and faces the illuminated body side and a rear surface that is the opposite surface of the front surface, and a plurality of side end surfaces that are connected to the front surface and the rear surface, and among the plurality of side end surfaces A light guide plate in which a concave portion for positioning is formed on a predetermined side end surface of
    A positioning member having a fitting portion fitted into the positioning concave portion of the light guide plate,
    A lighting device, wherein at least a surface of the fitting portion of the positioning member facing the concave surface of the positioning concave portion of the light guide plate is covered with an elastically deformable cushion member.
  2. 　前記クッション部材が前記位置決め部材の嵌合部の表面に固着されていることを特徴とする請求項１に記載の照明装置。 The lighting device according to claim 1, wherein the cushion member is fixed to a surface of the fitting portion of the positioning member.
  3. 　前記位置決め部材が前記導光板の板厚方向に沿って立設されたピン状部材からなっていることを特徴とする請求項１または２に記載の照明装置。 The lighting device according to claim 1 or 2, wherein the positioning member is formed of a pin-like member erected along the thickness direction of the light guide plate.
  4. 　前記位置決め部材の嵌合部の表面が全周にわたって前記クッション部材で覆われていることを特徴とする請求項３に記載の照明装置。 The lighting device according to claim 3, wherein a surface of the fitting portion of the positioning member is covered with the cushion member over the entire circumference.
  5. 　前記クッション部材が予め筒状に加工されており、
    　予め筒状に加工された前記クッション部材の空洞部に前記位置決め部材の嵌合部が挿入されていることを特徴とする請求項４に記載の照明装置。     The cushion member is processed into a cylindrical shape in advance,
    The lighting device according to claim 4, wherein a fitting portion of the positioning member is inserted into a hollow portion of the cushion member that has been processed into a cylindrical shape in advance.
  6. 　前記クッション部材がシート状であり、
    　シート状の前記クッション部材が前記位置決め部材の嵌合部に巻き付けられていることを特徴とする請求項４に記載の照明装置。　     The cushion member is in the form of a sheet,
    The lighting device according to claim 4, wherein the sheet-like cushion member is wound around a fitting portion of the positioning member.
  7. 　前記位置決め部材の嵌合部のピン軸方向の両端に鍔部が形成されていることを特徴とする請求項４～６のいずれかに記載の照明装置。 The lighting device according to any one of claims 4 to 6, wherein flanges are formed at both ends of the fitting portion of the positioning member in the pin axis direction.
  8. 　請求項１～７のいずれかに記載の照明装置と、
    　前記照明装置からの光で照明される表示パネルとを備えていることを特徴とする表示装置。     The lighting device according to any one of claims 1 to 7,
    And a display panel illuminated with light from the illumination device.
PCT/JP2011/068353 2010-08-20 2011-08-11 Lighting apparatus and display apparatus WO2012023484A1 (en)

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JP2013178334A (en) * 2012-02-28 2013-09-09 Sharp Corp Display device and television receiver
WO2013149407A1 (en) * 2012-04-05 2013-10-10 深圳市华星光电技术有限公司 Backlight module and liquid crystal display
WO2013166773A1 (en) * 2012-05-10 2013-11-14 深圳市华星光电技术有限公司 Light guide plate having fixed structure for buffer and protection and liquid crystal display device thereof
US8958030B2 (en) 2012-05-10 2015-02-17 Shenzhen China Star Optoelectronics Technology Co., Ltd. Backlight unit having buffer structures and liquid crystal display device using the same
WO2014192660A1 (en) * 2013-05-28 2014-12-04 堺ディスプレイプロダクト株式会社 Light-source device and display device
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JP2020503637A (en) * 2017-01-05 2020-01-30 京東方科技集團股▲ふん▼有限公司Ｂｏｅ Ｔｅｃｈｎｏｌｏｇｙ Ｇｒｏｕｐ Ｃｏ．，Ｌｔｄ． Backlight module and display device
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