JP2010197937A - Optical sheet, optical sheet laminated body, and back light device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To put an optical sheet to be hardly detached from a case, without increasing the sizes of the optical sheet and case. <P>SOLUTION: The optical sheet is equipped with: a sheet body 410; a projecting portion 411a, which projects from a peripheral edge of the sheet body in an outward direction extending from the inside of the peripheral edge 41a of the sheet body to the outside thereof; and a pawl 411b projecting from the projecting portion in a direction along the peripheral edge of the sheet body. A side from the projecting end of the projecting portion 411a to the projecting end of the pawl 411b inclines so as to gradually approach the peripheral edge of the sheet body 410 from the projecting end of the projecting portion 411a toward the projecting end of the pawl 411b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical sheet, an optical sheet laminate, and a backlight device used for a liquid crystal display device and the like.

  In a conventional electronic device such as a liquid crystal display device, a sheet member such as a flexible wiring board is fixed to the case by a hook provided on the case. Specifically, the case is provided with a hook made up of a support column that stands vertically on the upper surface of the back case and a flange that protrudes in the horizontal direction from the upper end of the support column. An equal-shaped locking hole is formed and hooked through the locking hole so that the sheet member does not come off the case (see Patent Document 1).

JP 2005-324729 A

By the way, almost the entire surface of the optical sheet constituting the backlight is a display area except for a small part of the peripheral edge. If it is going to provide a locking hole in such an optical sheet, it will be necessary to provide the space for forming a locking hole largely outside a display area, and an optical sheet will enlarge.
Therefore, the problem to be solved by the present invention is to make it difficult to remove the optical sheet from the case without increasing the size of the optical sheet.

In order to solve the above problems, according to one aspect of the present invention,
A sheet body, a protrusion projecting from the periphery of the sheet body in an outward direction from the inner periphery to the outside of the sheet body, and a claw projecting from the protrusion in a direction along the periphery of the sheet body. An optical sheet is provided.

Preferably, a side formed from the protruding end of the protruding portion to the protruding end of the claw is inclined so as to approach the peripheral edge of the sheet main body from the protruding end of the protruding portion toward the protruding end of the claw.
Preferably, the shape of the sheet body is a quadrangle, and the protrusion includes a first protrusion formed with a first claw and a second protrusion formed with a second claw, The protruding portion is provided on one side of the sheet body, and the second protruding portion is provided on the opposite side of the side.
Preferably, the shape of the sheet main body is a square or a rectangle, and the first protrusion and the second protrusion are arranged at positions that are substantially point-symmetric with respect to the center of the sheet main body.
Preferably, an optical sheet laminate is provided in which an optical sheet and another optical sheet are laminated.
Preferably, in the optical sheet laminate, the other optical sheet does not have a claw, and the optical sheet including the claw protruding from the protruding portion is stacked on an upper surface of the other optical sheet.

According to another aspect of the invention,
A surface light emitting device; a sheet main body placed on the surface light emitting device; a protrusion projecting from the peripheral edge of the sheet main body in an outward direction from the inner periphery to the outer periphery of the sheet main body; A nail projecting from the projecting portion in a direction along the direction, a hole into which the projecting portion and the nail are inserted, and a support for supporting the sheet body by inserting the projecting portion and the nail into the hole There is provided a backlight device comprising a unit.

  According to the present invention, since the optical sheet is supported by the projecting portion and the claw that are projected from the sheet main body, the space other than the display area of the optical sheet can be minimized. Further, the optical sheet can be made difficult to come off by passing the protruding portion and the claw through the hole formed in the support portion and hooking the claw on the outside of the support portion.

It is the disassembled perspective view which showed the liquid crystal display device in 1st Embodiment of this invention. It is the disassembled perspective view which showed the backlight apparatus in the same embodiment. It is the perspective view which expanded and showed a part of case in the same embodiment. It is the front view which showed the optical sheet in the same embodiment. It is the expansion perspective view which showed the lens sheet in the same embodiment. It is the perspective view which showed the LED unit in the embodiment. It is the rear view which showed the backlight apparatus in the same embodiment. It is the rear view which expanded and showed a part of backlight apparatus in the embodiment. It is the rear view which expanded and showed a part of backlight apparatus in 2nd Embodiment of this invention. It is the rear view which expanded and showed a part of backlight apparatus in 3rd Embodiment of this invention.

  Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

<First Embodiment>
First, the configuration of the liquid crystal display device 1 will be described.
FIG. 1 is an exploded perspective view of the liquid crystal display device 1. The liquid crystal display device 1 includes a display unit 2, an upper case 23, a lower case 24, and a backlight device 3.
The display unit 2 includes a liquid crystal display panel 21 having a rectangular or square plate shape, and a band-shaped FPC (Flexible Printed Circuit) 22 extending from the periphery of the rectangular display area of the liquid crystal display panel 21. The liquid crystal display panel 21 is sandwiched between an upper case 23 in which an opening 23a having substantially the same shape as the display area of the liquid crystal display panel 21 and a lower case 24 in which an opening 24a having substantially the same shape as the display area is formed. ing. The display area of the liquid crystal display panel 21 is exposed from the opening 23a and the opening 24a. The protruding end of the FPC 22 is connected to a control device (not shown). The backlight device 3 is attached to the back of the liquid crystal display panel 21. When the backlight device 3 emits light, the light passes through the display area of the liquid crystal display panel 21 and an image is displayed. Yes.

  FIG. 2 is an exploded perspective view of the backlight device 3. The backlight device 3 irradiates the display area of the liquid crystal display panel 21 with light. The backlight device 3 includes a base plate 31, a reflection sheet 32, an LED unit 33, a light guide plate 34, a light shielding tape 35, and optical sheets 41 to 43 in order from the bottom.

  The base plate 31 is a rectangular or square metal plate member that becomes the bottom of the backlight device 3. Around the base plate 31, support walls 31 a serving as support portions are respectively provided in a state where they are erected along the four sides of the base plate 31. Holes 311 (shown in FIG. 3) and 313 are formed in the support wall 31a provided on one side of the base plate 31. Further, a hole 312 and a hole 314 are formed in the support wall 31a provided on the opposite side of the side. The hole 312 is wider than the other holes 311, 313, and 314, and the holes 311, 313, and 314 have the same width.

  The reflection sheet 32 is placed on the upper surface of the base plate 31 and reflects light leaked from the lower surface of the light guide plate 34. As the reflection sheet 32, a plastic sheet having a metal-deposited reflection layer on the surface is used.

  The LED unit 33 is a light source that is attached to an upper end portion of the reflection sheet 32.

The light guide plate 34 is attached to the upper surface of the reflection sheet 32 and to the side of the LED unit 33, and converts the light incident from the LED unit 33 in the form of dots or lines into planar light to convert the light into the liquid crystal display panel 21. Are emitted toward the display area. A transparent resin material such as acrylic is used for the light guide plate 34, and a large number of fine irregularities for reflecting and diffusing light are formed on the surface. The side part of the light guide plate 34 is cut out in substantially the same shape as the LED unit.
In addition, instead of the LED unit 33 and the light guide plate 34, a surface light emitting element such as an organic electroluminescence element or an inorganic electroluminescence element may be provided under the diffusion sheet 41. A surface light emitting device in which a plurality of LEDs are two-dimensionally arranged can also be used.

  The light shielding tape 35 is attached to the upper surface of the LED unit 33 so that the light emitted from the LED unit 33 is directed only to the light guide plate 34. The light shielding tape 35 uses a thin member that does not transmit light.

  Here, each optical sheet attached to the backlight device 3 will be specifically described. FIG. 4 is a front view showing the optical sheets 41 to 43. The backlight device 3 includes optical sheets 41 to 43 having three different functions, that is, a diffusion sheet 41, a lens sheet 42, and a lens sheet 43.

  The diffusion sheet 41 is disposed on the upper surface of the light guide plate 34 and further diffuses the light emitted in a planar shape from the light guide plate 34 to make the luminance of the light emitted to the lens sheet 42 uniform. The diffusion sheet 41 is made of a transparent plastic resin, and the sheet body 410 of the diffusion sheet 41 is rectangular or square. Many fine protrusions for diffusing light are formed on the surface of the sheet body 410. On the side 410a of the sheet main body 410, a protruding portion 411a and a protruding portion 413a that protrude outward from the inside to the outside of the side 410a are formed. In addition, a protruding portion 412a and a protruding portion 414a that protrude outward from the inner side of the side 410a to the outer side are formed on the side 410b that is the opposite side of the side 410a. The protrusions 411a to 414a are all rectangular. Further, the protrusion 412a is provided wider than the other protrusions 411a, 413a, and 414a, and the protrusions 411a, 413a, and 414a have the same width. The protrusions 411 a and 414 a are point target positions with respect to the center of gravity of the sheet body 410, and the protrusions 412 a and protrusions 413 a are point target positions with respect to the center of gravity of the sheet body 410. The protrusions 411 a to 414 a are formed in accordance with the positions of the holes 311 to 314 of the base plate 31.

Further, a trapezoidal claw 411b protruding in a direction along the side 410a and a claw 411c which is a second claw protruding in the opposite direction to the protruding direction of the claw 411b are formed at the protruding end of the protruding portion 411a. Then, one side of the tip of the protruding portion 411a and one side of the claws 411b and 411c form a continuous straight line. For this reason, the shape which put together the protrusion part 411a and the nail | claws 411b and 411c becomes a substantially T shape as shown in FIG. The distance from the protruding end of the claw 411b to the protruding end of the claw 411c is longer than the lateral width of the hole 311.
Claws 412b to 414b and claws 412c to 414c are formed on the other protrusions 412a to 414a as well as the protrusion 411a.

  The lens sheet 42 is laminated on the upper surface of the diffusion sheet 41 and increases the directivity of the diffused light emitted from the diffusion sheet 41. In the lens sheet 42, the diffusion sheet 41 is made of a transparent plastic resin, and the sheet body 420 of the lens sheet 42 has a rectangular or square shape that is substantially the same shape as the sheet body 410. When the upper surface of the sheet main body 420 is enlarged, as shown in FIG. 5, a prism pattern 42a in which a plurality of triangular prisms are closely arranged is formed. On the side 420a of the sheet main body 420, a protruding portion 421a and a protruding portion 423a that protrude outward from the inside of the side 420a to the outside are formed. In addition, a protruding portion 422a and a protruding portion 424a that protrude outward from the inner side of the side 420a to the outer side are formed on the side 420b that is the opposite side of the side 420a. The protrusions 421a to 424a are all rectangular. The protrusion 422a is provided wider than the other protrusions 421a, 423a, and 424a, and the protrusions 421a, 423a, and 424a have the same width. The protrusions 421a and 424a are pointed positions with respect to the center of gravity of the sheet main body 420, and the protrusions 422a and 423a are pointed with respect to the center of gravity of the sheet main body 420. The protrusions 421a to 424a are also formed in accordance with the positions of the holes 311 to 314 of the base plate 31.

In addition, a trapezoidal claw 421b that protrudes in the direction along the side 420a and a claw 421c that is a second claw that protrudes in the direction opposite to the protruding direction of the claw 421b are formed at the protruding end of the protruding portion 421a. Then, one side of the tip of the protruding portion 421a and one side of the claws 421b and 421c form a continuous straight line. For this reason, the shape which put together the protrusion part 421a and the nail | claws 421b and 421c becomes a substantially T shape as shown in FIG. The distance from the protruding end of the claw 421b to the protruding end of the claw 421c is longer than the lateral width of the hole 311.
Claws 422b to 424b and claws 422c to 424c are formed on the other protrusions 422a to 424a as well as the protrusion 421a.

  The lens sheet 43 is laminated on the upper surface of the lens sheet 42 and enhances the directivity of the diffused light emitted from the diffusion sheet 41 in the same manner as the lens sheet 42. The lens sheet 43 is made of a transparent plastic resin, and the sheet body 430 of the lens sheet 43 has a rectangular or square shape that is substantially the same shape as the sheet body 410. When the upper surface of the sheet main body 430 is enlarged, as shown in FIG. 5, a prism pattern 43a in which a plurality of triangular prisms are closely arranged is formed. On the side 430a of the sheet body 430, a protruding portion 431a and a protruding portion 433a that protrude outward from the inner side to the outer side of the side 430a are formed. In addition, a protruding portion 432a and a protruding portion 434a that protrude outward from the inner side of the side 430a to the outer side are formed on the side 430b that is the opposite side of the side 430a. The protrusions 431a to 434a are all rectangular. The protrusion 432a is provided wider than the other protrusions 434a, 433a, 434a, and the protrusions 434a, 423a, 424a have the same width. The protrusion 434 a and the protrusion 434 a are point target positions with respect to the center of gravity of the sheet body 430, and the protrusion 432 a and the protrusion 433 a are point target positions with respect to the center of gravity of the sheet body 430. The protrusions 431a to 434a are also formed in accordance with the positions of the holes 311 to 314 of the base plate 31.

Further, a trapezoidal claw 431b that protrudes in the direction along the side 430a and a claw 431c that is a second claw that protrudes in a direction opposite to the protruding direction of the claw 431b are formed at the protruding end of the protruding portion 431a. Then, one side of the tip of the protrusion 431a and one side of the claws 431b and 431c form a continuous straight line. For this reason, the shape which put together the protrusion part 431a and the nail | claw 431b and 431c becomes a substantially T shape as shown in FIG. The distance from the protruding end of the claw 431 b to the protruding end of the claw 431 c is longer than the lateral width of the hole 311.
Claws 432b to 434b and claws 432c to 434c are formed on the other protrusions 432a to 434a as well as the protrusion 431a.

  When the reflective sheet 32, the LED unit 33, and the light guide plate 34 are incorporated in the base plate 31, and the LED unit 33 is attached to the side of the light guide plate 34, the LED unit 33 is cut off from the light guide plate 34 as shown in FIG. The surface light emitting device 36 is completed in the notch.

FIG. 7 is a rear view showing the backlight device 3 after assembly. FIG. 8 is an enlarged rear view showing the engagement state between the hole 311 and the protrusion 411a in FIG. When the diffusion sheet 41, the lens sheet 42, and the lens sheet 43 are attached on the surface light emitting device 36, the protrusions 411a, 421a, 431a are inserted into the holes 311 and the support wall 31a as shown in FIG. Are interposed between the claws 411b to 431b and 411c to 431c and the sides 410a to 430a. Then, as shown in FIG. 8, the claws 411b to 431b and 411c to 431c are caught around the hole 311 from the outside of the support wall 31a.
Similarly, the protrusions 412a to 432a are inserted into the holes 312, the protrusions 413a to 433a are inserted into the holes 313, the protrusions 414a to 434a are inserted into the holes 314, and the support walls 31a are inserted into the claws 412b to 432b and 412c to 412c. It is interposed between 432c and the sides 410a to 430a, between the claws 413b to 433b and 413c to 433c and the sides 410a to 430a, and between the claws 414b to 434b and 414c to 434c and the sides 410a to 430a. The claws 412b to 432b and 412c to 432c are around the hole 312, the claws 413b to 433b and 413c to 433c are around the hole 313, the claws 414b to 434b and 414c to 434c are around the hole 314, and the support wall 31a. Each is caught from the outside.
When the lens sheets 42 and 43 are attached to the base plate 31, the prism patterns 42a and 43a are orthogonal to each other as shown in FIG. Thus, the backlight device 3 is configured.

Next, a mechanism in which the backlight device 3 irradiates the display area of the liquid crystal display panel 21 with light will be described.
When the LED unit 33 is caused to emit light, the light enters the light guide plate 34. The incident light is repeatedly reflected inside the light guide plate 34, and the entire upper surface of the light guide plate 34 emits light and is emitted to the diffusion sheet 41. Some light leaks to the lower surface of the light guide plate 34, but is reflected by the reflection sheet 32 attached to the lower surface of the light guide plate 34. Is done.
The light incident on the diffusion sheet 41 is diffused and emitted to the lens sheet 42 as light directed in various directions.
The light emitted from the diffusion sheet 41 enters the lower surface of the lens sheet 42. Then, the diffused light is refracted by the prism pattern 42a, and the X-direction component is removed from the diffused light and emitted.
The light emitted from the upper surface of the lens sheet 42 then enters the lower surface of the lens sheet 43. Then, the light is refracted by the prism pattern 43a, and the component in the Y direction is removed from the light and emitted. In this way, the diffused light emitted from the diffusion sheet 41 is emitted to the display area of the liquid crystal display panel 21 as light having enhanced directivity in a direction perpendicular to the XY plane.

Next, a method for manufacturing the backlight device 3 will be described.
First, the reflection sheet 32 is laid on the upper surface of the base plate 31, and the light guide plate 34 is placed on the reflection sheet 32. And the LED unit 33 is attached to the side part of the light-guide plate 34, and the light shielding tape 35 is affixed on the upper surface of an LED unit. In this way, the surface light emitting device 36 is completed.

After the surface light emitting device 36 is assembled, the diffusion sheet 41 is attached on the light guide plate 34. First, the nail 411b and the nail 411c are pushed by sandwiching them with fingers from the left and right sides, and the nail 411b, the nail 411c and the protruding portion 411a are bent. Then, the protrusion 411a and the claws 411b and 411c are passed through the hole 311 in a state where the distance from the protruding end of the claw 411b to the protruding end of the claw 411c is shorter than the lateral width of the hole 311. The claw 411b, the claw 411c, and the protruding portion 411a inserted into the hole 311 return to a flat shape again, and the distance from the protruding end of the claw 411b to the protruding end of the claw 411c becomes longer than the lateral width of the hole 311. Thus, the claw 411b and the claw 411c are caught around the hole 311 from the outside of the support wall 31a.
At the time of attachment, the protrusion 412a formed wider than the other protrusions 411a, 413a, and 414a serves as a mark, so that the diffusion sheet 41 can be attached to the base plate 31 without making a mistake in front, back, left, and back.

  When the protrusion 411a is locked to the support wall 31a by the claw 411b and the claw 411c, the protrusions 412a to 414a are also inserted into the holes 312 to 314 in the same manner as the protrusion 411a, and the claws 412b to 414b and 412c to 414c are inserted into the holes. Hook around 312-314. In this way, all the protrusions 411a to 414a of the diffusion sheet 41 are locked to the support wall 31a, and the attachment of the diffusion sheet 41 to the base plate 31 is completed.

  After the diffusion sheet 41 is attached, the lens sheet 42 is attached to the base plate 31 in the same manner as the diffusion sheet 41, and the lens sheet 43 is attached to the lens sheet 42 in the same manner as the diffusion sheet 41. In this way, the backlight device 3 is completed.

  On the other hand, the upper case 23 and the lower case 24 are assembled to the display unit 2, and the backlight device 3 is assembled thereto. In this way, the liquid crystal display device 1 is completed.

<Second Embodiment>
FIG. 9 is an enlarged rear view showing a state in which the protruding portion 511 a is engaged with the hole 311. The difference of this embodiment from the first embodiment is the shape of the protrusion and the claw. All other configurations are the same as those used in the first embodiment.
On the side 510a of the sheet main body 510, a protruding portion 511a that protrudes outward from the inside to the outside of the side 510a is formed. The protrusion 511a has a pentagonal shape.
At the protruding end of the protruding portion 511a, a triangular claw 511b protruding in a direction along the side 510a and a claw 511c that is a second claw protruding in the opposite direction to the protruding direction of the claw 511b are formed. A side 511g extending from the protruding end 511d to the protruding end 511e and a side 511h extending from the protruding end 511d to the protruding end 511f are inclined so as to approach the side 510a from the protruding end 511d toward the protruding ends 511e and 511f. For this reason, the shape which put together the protrusion part 511a and the nail | claw 511b, 511c becomes a substantially arrow type as shown in FIG. The distance from the protruding end 511e to the protruding end 511f is longer than the lateral width of the hole 311.
The protrusion 511a is inserted into the hole 311 of the support wall 31a, and the support wall 31a is interposed between the claws 511b and 511c and the side 510a. The claws 511b and 511c are caught around the hole 311 from the outside of the support wall 31a.

  When the protruding portion 511a is inserted into the hole 311 of the support wall 31a, first, the nail 511b and the nail 511c are pushed with the fingers sandwiched from the left and right sides, and the nail 511b, the nail 511c and the protruding portion 511a are bent. Then, the protruding portion 511 a and the claws 511 b and 511 c are passed through the hole 311 in a state where the distance from the protruding end 511 e of the claw 511 b to the protruding end 511 f of the claw 511 c is shorter than the lateral width of the hole 311. The claw 511b, the claw 511c, and the protruding portion 511a inserted into the hole 311 return to a flat shape again, and the distance from the protruding end 511e of the claw 511b to the protruding end 511f of the claw 511c is longer than the lateral width of the hole 311. Thus, the claw 511b and the claw 511c are caught around the hole 311 from the outside of the support wall 31a. As described above, sides 511g and 511h formed from the protrusion 511d of the protrusion 511a to the protrusions 511e and 511f of the claw gradually approach the periphery of the sheet main body 510 from the protrusion 511d of the protrusion 511a toward the protrusions 511e and 511f of the claw. Such a sloping shape facilitates insertion from the tip 511d and also improves catching.

<Third Embodiment>
FIG. 10 is an enlarged rear view showing a state in which the protruding portion 611 a is engaged with the hole 311. The differences of the present embodiment from the first and second embodiments are the shape of the protrusions and nails and the number of nails. Other configurations are all the same as those used in the first and second embodiments.
On the side 610a of the sheet main body 610, a protruding portion 611a that protrudes outward from the inside to the outside of the side 610a is formed. The protrusion 611a has a trapezoidal shape.
A triangular claw 611b protruding in a direction along the side 610a is formed at the protruding end of the protruding portion 611a. A side 611e formed from the protruding end 611c to the protruding end 611d is inclined so as to approach the side 610a asymptotically from the protruding end 611c toward the protruding end 611d. For this reason, the shape which put together the protrusion part 511a and the nail | claw 511b becomes a substantially claw-shaped type as shown in FIG. The distance from the protruding end 611d to the side 611f is longer than the lateral width of the hole 311.
The protrusion 611a is inserted into the hole 311 of the support wall 31a, and the support wall 31a is interposed between the claw 611b and the side 610a. The claw 611b is caught around the hole 311 from the outside of the support wall 31a.

  When inserting the protruding portion 611a into the hole 311 of the support wall 31a, first, the nail 611b and the side 611f are pushed with fingers sandwiched from the left and right sides, and the nail 611b, the side 611f and the protruding portion 611a are bent. Then, the protrusion 611 a and the claw 611 b are passed through the hole 311 in a state where the distance from the protruding end 611 d of the claw 611 b to the side 611 f is shorter than the lateral width of the hole 311. The claw 611b and the protrusion 611a inserted into the hole 311 return to a flat shape again, and the distance from the protruding end 611d of the claw 611b to the side 611f becomes longer than the lateral width of the hole 311. Thus, the claw 611b is caught around the hole 311 from the outside of the support wall 31a. As described above, the side 611e formed from the protruding end 611c of the protruding portion 611a to the protruding end 611d of the claw is inclined so as to approach the peripheral edge of the sheet body 610 from the protruding end 611c of the protruding portion 611a toward the protruding end 611d of the claw. That is, it is easy to insert from the tip 611c, and the catch is also improved. Further, by reducing the number of claws, a space other than the display area provided on the optical sheet can be minimized.

Note that the number of protrusions formed on each sheet body is not necessarily four, and the number formed may be increased or decreased. Further, the number of protrusions provided on the opposite sides is not necessarily the same.
Further, it is not necessary to provide the claws on all the protrusions, and for example, the claws may be provided only on the two protrusions located in point symmetry with respect to the center of the sheet main body. For example, it is good also as joining only one place of the protrusion parts 411-431. Further, only two portions of the protruding portions 411 to 431 and the protruding portions 414 to 434 that are point-symmetric with the protruding portions 411 to 431 with respect to the center of each sheet body, or the protruding portions 413 to 433 that are point-symmetric to the protruding portions 412 to 432. You may make it join only these two places. Thus, if it joins at two places, each optical sheet 410-430 can be made hard to remove | deviate from a case.
The optical sheet attached to the case does not need to be three sheets including the diffusion sheet and the two lens sheets. Even if the type of the optical sheet to be used is changed or the number of sheets to be used is changed depending on the apparatus. Good.
Moreover, it is not necessary to provide a nail | claw in all the optical sheets, and it is good also as providing only in the optical sheet attached to the top.
Alternatively, the claws may be formed by passing the projections through the case and then extending the projections by heating, without providing the claws in advance.
Further, in the present embodiment, only one portion of the projecting portion is formed wide so that the optical sheet laminate can be securely attached to the case without making a mistake in the front, back, left, and back, but the present invention is not limited thereto. It is sufficient that the shape is different, for example, the protrusion is cut only at one place.

According to the present embodiment, since the optical sheet is hooked on the case from the outside of the hole by the nail, the space other than the display area provided in the optical sheet is minimized, and the size of the case is substantially the same size as the sheet body. Even in such a state, the optical sheet can be hardly detached from the case.
Further, by tilting the side formed from the protruding end of the protruding portion to the protruding end of the claw so as to approach the peripheral edge of the sheet main body from the protruding end of the protruding portion toward the protruding end of the claw, the protruding portion and the claw can be easily inserted into the hole.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Display part unit 21 Liquid crystal display panel 3 Backlight apparatus 31a Support wall (support part)
311 to 314 Hole 32 Reflective sheet 33 LED unit 34 Light guide plate 35 Light shielding tape 36 Surface light emitting device 41 Diffusion sheet (optical sheet)
410 Sheet body 411a to 414a Protruding part 411b to 414b Claw 411c to 414c Claw (second claw)
42, 43 Lens sheet (optical sheet)
420, 430 Sheet main body 421-424a, 431-434a Projection 421b-424b, 431a-434b Claw 421c-424c, 431b-434c Claw (second claw)
42a, 43a Prism pattern 510 Sheet body 511a Projection 511b Claw 511c Claw (second claw)
511d to 511f Protruding end 511g, 511h Side 610 Sheet body 611a Protruding portion 611b Claw 611c, 611d Protruding end 611e, 611f Side

Claims (7)

The seat body,
A projecting portion projecting from the periphery of the seat body in an outward direction from the periphery of the seat body toward the outside;
An optical sheet comprising: a claw projecting from the projecting portion in a direction along the periphery of the sheet main body.   The side formed from the protruding end of the protruding portion to the protruding end of the claw is inclined so as to gradually approach the peripheral edge of the sheet body from the protruding end of the protruding portion toward the protruding end of the claw. Optical sheet. The shape of the seat body is a rectangle,
The protrusion includes a first protrusion formed with a first claw and a second protrusion formed with a second claw, and the first protrusion is provided on one side of the sheet body. The optical sheet according to claim 1, wherein the second projecting portion is provided on the opposite side of the side.   The shape of the sheet main body is a square or a rectangle, and the first protrusion and the second protrusion are arranged at positions that are substantially point-symmetric with respect to the center of the sheet main body. 4. The optical sheet according to 3.   An optical sheet laminate, wherein the optical sheet according to any one of claims 1 to 4 and another optical sheet are further laminated. In the optical sheet laminate according to claim 5,
The other optical sheet does not have a nail,
The optical sheet laminate, wherein the optical sheet including the claw protruding from the protruding portion is stacked on an upper surface of the other optical sheet. A surface emitting device;
A sheet body placed on the surface emitting device;
A projecting portion projecting from the periphery of the seat body in an outward direction from the periphery of the seat body toward the outside;
A claw protruding from the protruding portion in a direction along the periphery of the sheet body,
A backlight device comprising a hole into which the protruding portion and the claw are inserted, and a support portion that supports the sheet body by inserting the protruding portion and the claw into the hole.

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