JP2007265632A - Light unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent wrinkles or the like on an optical film, and prevent noise generated when a side part of the optical film and an inner surface of a side wall of a frame abut on each other. <P>SOLUTION: A part of a diffusion film 11 is fixed in the frame 4 by forming a projection 12 for fixing in a center part of a first side part 11a of the diffusion film 11 and adhering the projection 12 for fixing and the frame 4. A projection 16 for position restriction for restricting an arrangement position of the diffusion film 11 in the frame 4 is formed on a second side part 11b facing to the first side part 11a of the diffusion film 11. A recessed part 17 for position restriction which is locked on the projection 16 for position restriction is formed in a position facing to the projection 16 for position restriction in a second side wall 3b of the frame 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light unit that includes an optical film and a frame that houses the optical film, and a part of the optical film is fixed in the frame.

  Conventionally, a light unit for irradiating irradiation light to a display panel such as a liquid crystal display panel has been used.

  FIG. 6 is a schematic plan view showing an example of a conventional light unit. As shown in FIG. 6, the conventional light unit 30 includes a bottom plate and side walls 32 erected on each side edge of the bottom plate. A frame 33 is provided. In the frame 33, a light guide plate (not shown) and a light source arranged to face the side surface of the light guide plate are stored, and a plurality of optical films 34 are stored stacked on the light guide plate. .

  When such an optical film 34 is fixed and stored in the frame 33, if the entire first side 34 a or a plurality of sides of the optical film 34 are fixed in the frame 33, the ambient temperature at which the light unit 30 is used. When each optical film 34 expands and contracts due to the above, wrinkles, deflections, etc. may occur in each optical film 34. And when irradiation light is irradiated using the optical film 34 which such a wrinkle etc. generate | occur | produced, a nonuniformity will generate | occur | produce in irradiation light, As a result, the display panel was displayed using such irradiation light. In this case, there is a problem that the optical characteristics of the display panel are deteriorated.

  For this reason, conventionally, in order to prevent wrinkles or the like from occurring in each optical film 34, for example, a fixing protrusion for fixing the optical film 34 to a part of the first side 34a of each optical film 34. 35 is formed so as to protrude from the first side 34a, and a fixing recess 36 in which the fixing projection 34 is loosely fitted is formed on the first side wall 32a of the frame 33 facing the first side 34a of the optical film 34. To do. And the optical film 34 is fixed to the flame | frame 33 by sticking the bottom face of the fixing protrusion 35, and the fixing recessed part 36 using a double-sided adhesive tape. Thus, there is known a light unit 30 that houses each optical film 34 in the frame 33 by fixing a part of the first side 34a of each optical film 34 to the frame 33 (for example, Patent Document 1). 2).

  However, in the above-described light unit 30, each optical film 34 is fixed to the frame 33 only by a part of the first side 34a. Therefore, when the light unit 30 is mounted on a display device and used, There is a possibility that 34 may rotate in the frame 33 with a fixed portion to the frame 33 as a fulcrum. In such a case, each optical film 34 is displaced in the direction of the other side wall 32b disposed adjacent to one side wall 32a of the frame 33 and fixed to the frame 33 in each optical film 34. The other side 34b adjacent to the first side 34a is in contact with the inner surface of the other side wall 32b of the frame 33 over a wide range, and as a result, noise called rattle noise may occur.

JP 2004-258460 A JP 2005-158707 A

  The present invention has been made in view of these points, and prevents wrinkles and the like from occurring in the optical film, and noise is generated due to contact between the side of the optical film and the inner surface of the side wall of the frame. It is an object of the present invention to provide a light unit that can prevent the occurrence of the light unit.

  In order to achieve the above object, the light unit according to the present invention is characterized by comprising an optical film having a plurality of side edges and a side wall disposed opposite to the side edges of the optical film, and storing the optical film. A light unit having a frame to be attached, wherein one side of the plurality of sides is attached to the frame, and at least one of the remaining sides is disposed on the optical film in the frame. A film-side position restricting locking portion for restricting the position is formed, and the film side position restricting locking portion is locked at a position facing the film side position restricting locking portion of the side wall of the frame. The frame side position restricting locking portion is formed, and the film side position restricting locking portion and the frame side position restricting locking portion are not attached. A.

  Further, in the light unit, the film side position restricting locking portion is a position restricting protrusion formed so as to protrude from the side, and the frame side position restricting locking portion is the optical portion on the side wall. The surface facing the film may be a concave portion for position regulation formed in a concave shape.

  According to the light unit of the present invention, since only one side of the optical film is fixed to the frame, even if the diffusion film expands or contracts due to the environmental temperature or the like, wrinkles or deflections occur in the diffusion film. Can be prevented. At the same time, the optical film is opposed to the first side and the first side by the fixing part with the frame and the locking part between the film side position regulating locking part and the frame side position regulating locking part. It can be supported by two points on the second side. For this reason, since it can control that an optical film rotates within a frame, it can prevent that the side of an optical film contacts the inner surface of the side wall which a frame counters.

  In addition, the other light unit according to the present invention is characterized in that the film-side locking portion side edge disposed in a direction other than the protruding direction of the film-side position limiting locking portion and the frame-side position limiting locking The gap between the inner side of the frame and the inner side of the frame side locking part facing the side of the film side locking part is arranged in a direction other than the protruding direction of the locking part for restricting the film side position of the remaining side. The gap between the non-projecting direction side and the inner surface of the side wall facing the non-projecting direction side of the frame is shorter.

  According to the other light unit according to the present invention, even if the film side locking portion side edge of the film side position regulating locking portion abuts the inner surface of the frame side position regulating locking portion, It is possible to reliably prevent the other side from coming into contact with the inner surface of the opposite side wall of the frame.

  Furthermore, another light unit according to the present invention is characterized in that the film-side position restricting locking portion has a rectangular planar shape, and one corner on the protruding side of the film-side position restricting locking portion. The chamfered portion is chamfered so as to have a different shape from the other corner portion, and a portion of the inner surface of the frame side position regulating locking portion that faces the chamfered portion is the chamfered portion. It is in the point made into the chamfering opposing part formed so that it may adjoin to the shape of a part.

  According to the other light unit of the present invention, one corner on the protruding side of the film side position restricting locking portion is a chamfered portion, and the inner surface of the frame side position restricting locking portion is chamfered. When the optical film is stored in the frame, even if it is stored upside down with the front or back facing in the wrong direction, The other corners on the protruding side cannot be brought into contact with the chamfering facing portion of the frame-side position restricting locking portion for storage. For this reason, the optical film can be reliably stored in the frame without making a mistake in the front and back sides or directions.

  As described above, according to the light unit according to the present invention, when the light unit irradiates the display panel with the irradiation light by preventing generation of wrinkles of the optical film, the display panel is uniformly irradiated. Since it can irradiate light, it can prevent that the optical characteristic of a display panel falls. At the same time, by reducing the contact area between the other side of the optical film and the inner surface of the opposite side wall of the frame, and further preventing the contact, noise called rattle noise occurs in the light unit. Can be prevented.

  Hereinafter, an embodiment of a light unit according to the present invention will be described with reference to FIGS.

  Here, in this embodiment, a description will be given using a backlight unit disposed on the non-viewing side of the display panel as the light unit.

  FIG. 1 is a schematic plan view showing a light unit according to this embodiment, and FIG. 2 is a schematic cross-sectional view taken along line AA of the light unit of FIG.

  As shown in FIGS. 1 and 2, the backlight unit 1 according to this embodiment includes a frame 4 having a rectangular bottom plate 2 and side walls 3 erected on each side edge of the bottom plate 2. Step portions 5 a and 5 b are formed on the inner surfaces of both side walls 3 in the direction orthogonal to the longitudinal direction of the frame 4.

  A reflective film 7 made of a resin material or the like is disposed on the viewing side of the bottom plate 2 in the frame 4. On the viewing side of the reflective film 7, a rectangular light guide plate 8 made of a resin material or the like is laminated on the reflective film 7, and at a position facing both opposite side surfaces of the light guide plate 8 in the longitudinal direction. A light source 9 composed of an LED, a cold cathode lamp or the like is disposed.

  And the height dimension of each level | step-difference part 5a, 5b formed in the flame | frame 4 is formed in the height dimension substantially the same as the height dimension of the reflective film 7 and the light-guide plate 8. As shown in FIG.

  A plurality of optical films are laminated on the light guide plate 8 on the viewing side of the light guide plate 8. In the present embodiment, a rectangular diffusion film 11 that diffuses light as the optical film is provided on the light guide plate 8. It is arranged in a stacked manner and stored in the frame 4.

  In the central portion of the first side 11a, which is one side in the direction orthogonal to the longitudinal direction of the diffusion film 11, a fixing projection 12 having a rectangular planar shape used for fixing to the frame 4 is provided on the first side. The fixing is made such that the fixing protrusion 12 is loosely fitted on the top surface of the first step portion 5a on the first side wall 3a facing the first side 11a of the frame 4 and protruding from the side 11a. A concave portion 13 is formed. The bottom surface of the fixing protrusion 12 is attached to the viewing side of the fixing recess 13 via the double-sided adhesive tape 14, whereby the diffusion film 11 is fixed inside the frame 4.

  A position regulating protrusion as a film side position regulating locking portion for regulating the arrangement position of the diffusion film 11 in the frame 4 at the center portion of the second side 11b facing the first side 11a of the diffusion film 11 16 protrudes from the second side 11b. As shown in FIG. 3, the position restricting protrusion 16 is formed in a rectangular planar shape, and one corner on the protruding side of the position restricting protrusion 16 is different in shape from the other corners. The chamfered portion 16a is chamfered. The position regulating projection 16 is loosely fitted on the top surface of the second step portion 5 b of the second side wall 3 b facing the second side 11 b in the frame 4 and facing the position regulating projection 16. A position restricting recess 17 is formed as a frame side position restricting locking portion. And the part which opposes the chamfering part 16a of the protrusion 16 for position control among the inner surfaces of the recessed part 17 for position control is formed along the shape of the chamfering part 16a, and is made into the chamfering opposing part 17a.

  Here, the side arranged in the direction (direction other than the projecting direction) orthogonal to the projecting direction of the position regulating projection 16 among the respective sides of the position regulating projection 16 is the side on the film side locking portion. The first protrusion side 16b and the second protrusion side 16c are as follows. In addition, the inner surfaces of the position restricting protrusion 16 facing the first protrusion side 16b and the second protrusion side 16c of the position restricting protrusion 16 are referred to as a first recess side inner face 17b and a second recess side inner face 17c. . Furthermore, the non-protruding direction side arranged in the direction (direction other than the projecting direction) orthogonal to the projecting direction of the position restricting projection 16 among the respective sides of the diffusion film 11 is defined as the third side 11c and the first side. Let it be 4 side 11d. And let the side wall 3 which opposes the 3rd side edge 11c and the 4th side edge 11d of the diffusion film 11 in the flame | frame 4 be the 3rd side wall 3c and the 4th side wall 3d.

  The gap dimension between the first projection side side 16b and the second projection side side 16c of the position regulating projection 16 and the first recess side inner surface 17b and the inner second recess side inner surface 17c of the position regulating recess 17 is a diffusion film. 11 is formed shorter than the gap dimension between the third side edge 11c and the fourth side edge 11d of the frame 11 and the inner surfaces of the third side wall 3c and the fourth side wall 3d of the frame 4. In this embodiment, the first protrusion-side side 16b and the second protrusion-side side 16c of the position restricting protrusion 16, and the first recess-side inner face 17b and the inner two recessed-side inner face 17c of the position restricting recess 17 The gap dimension is 0.2 mm. The gap dimension between the third side edge 11c and the fourth side edge 11d of the diffusion film 11 and the inner surfaces of the third side wall 3c and the fourth side wall 3d of the frame 4 is 0.4 mm.

  Such a backlight unit 1 is disposed on the non-viewing side of the display panel (not shown), and irradiates the display panel with light emitted from the light source 9 via the light guide plate 8 and the diffusion film 11.

  Next, the operation of this embodiment will be described.

  According to this embodiment, by sticking the fixing protrusion 12 of the diffusion film 11 to the fixing recess 13, only a part of the diffusion film 11 is fixed to the frame 4. Even when the film is stretched, it is possible to prevent the diffusion film 11 from being wrinkled or bent.

  Further, in the diffusion film 11, the fixing protrusion 12 is fixed to the frame 4, and the position restricting protrusion 16 is locked to the position restricting concave portion 17 of the frame 4. 4, the fixing projection 12 formed on the first side 11a and the position regulating projection 16 formed on the second side 11b opposite to the first side 11a can be supported. For this reason, since it can control that the diffusion film 11 moves to the direction of the 3rd side wall 3c and the 4th side wall 3d in the flame | frame 4, the 3rd side edge 11c and the 4th side edge 11d of the diffusion film 11 can be controlled. Can be prevented from coming into contact with the inner surfaces of the third side wall 3c and the fourth side wall 3d of the frame 4.

  Therefore, by preventing generation of wrinkles or the like of the diffusion film 11, it is possible to uniformly irradiate the display panel with the irradiation light from the backlight unit 1, so that the optical characteristics of the display panel are deteriorated. Can be prevented. At the same time, the range in which the third side edge 11c and the fourth side edge 11d of the diffusion film 11 are in contact with the inner surfaces of the third side wall 3c and the fourth side wall 3d of the frame 4 is reduced, and further the contact is prevented. Thus, it is possible to prevent the so-called rattle noise from being generated in the backlight unit 1.

  Further, according to the backlight unit 1 according to the present embodiment, the first protrusion-side side 16b and the second protrusion-side side 16c of the position-regulating protrusion 16, and the first recess-side inner surface 17b of the position-regulating recess 17 are provided. The gap dimension between the second recess side inner surface 17c and the third side edge 11c and the fourth side edge 11d of the diffusion film 11 and the inner surface of the third side wall 3c and the fourth side wall 3d of the frame 4 are as follows. Compared to the short length. For this reason, even if the first protrusion side 16b or the second protrusion side 16c of the position restricting protrusion 16 abuts the first recess side inner face 17b or the second recessed side inner face 17c of the position restricting recess 17. The third side edge 11c or the fourth side edge 11d of the diffusion film 11 can be reliably prevented from coming into contact with the inner surface of the third side wall 3c or the fourth side wall 3d of the frame 4. As a result, the range in which the diffusion film 11 abuts the frame 4 can be reduced, and rattle noise can be further prevented.

  Furthermore, one corner on the protruding side of the position regulating protrusion 16 is a chamfered portion 16a, and the inner surface of the position regulating concave portion 17 is a chamfered facing portion 17a having a shape along the chamfered portion 16a. Therefore, when the diffusion film 11 is stored in the frame 4, even if it is stored upside down with the wrong direction, the other corner of the protruding side of the position restricting projection 16 is the surface of the position restricting recess 17. The abutting portion 17a cannot be reliably stored by contacting. For this reason, the diffusion film 11 can be reliably stored in the frame 4 without making a mistake in the front and back sides or directions.

  Next, a second embodiment of the backlight unit 1 according to the present invention will be described with reference to FIG.

  In addition, about the part which has the same structure as the backlight unit 1 of 1st Embodiment, it attaches | subjects and demonstrates the same code | symbol, and abbreviate | omits detailed description.

  In the frame 4 of the backlight unit 1 in the present embodiment, a plurality of optical films are laminated on the light guide plate 8. In the present embodiment, in addition to the diffusion film 11, the irradiated light is used as the optical film. A prism sheet 19 is used to improve the brightness.

  A first fixing protrusion 12 is formed at one end portion of the first side 11 a of the diffusion film 11 disposed on the light guide plate 8 side, and the top of the first step portion 5 a on the first side wall 3 a of the frame 4. A first fixing recess 13 is formed in a portion of the surface facing the first fixing protrusion 12 so that the first fixing protrusion 12 is loosely fitted. And the bottom face of the 1st fixing protrusion 12 is stuck and fixed to the 1st fixing recessed part 13 using a double-sided adhesive tape (not shown).

  Further, a first position regulating protrusion 16 is formed at one end portion of the second side 11b of the diffusion film 11, and is the top surface of the second step portion 5b in the second side wall 3b of the frame 4. A first position restricting recess 17 is formed in a portion facing the one position restricting protrusion 16. The first position regulating protrusion 16 is locked to the first position regulating recess 17.

  Further, the second fixing protrusion is formed on the other end portion of the first side 11a of the diffusion film 11 opposite to the one end of the first side 11a of the prism sheet 19 disposed on the viewing side of the diffusion film 11. 20 is formed, and the second fixing protrusion 20 is loosely fitted on the top surface of the first step portion 5a on the first side wall 3a of the frame 4 and facing the second fixing protrusion 20. A second fixing recess 21 having a size is formed. And the bottom face of the 2nd fixing protrusion 20 is stuck and fixed to the 2nd fixing recessed part 21 using a double-sided adhesive tape (not shown).

  Furthermore, a second position restricting projection 23 is formed on the other side of the second side 11b of the prism sheet 19 opposite to the one end of the second side 11b of the diffusing film 11. A second position restricting recess 24 is formed on the top surface of the second step portion 5 b in the fourth second side wall 3 b and facing the second position restricting protrusion 23. The second position restricting projection 23 is engaged with the second position restricting recess 24.

  Here, as in the second embodiment, in the backlight unit 1 in which a plurality of optical films are stacked and arranged, each optical film is directly attached to the frame 4 and securely stored in the frame 4. Therefore, it is preferable that the fixing protrusions 12 and 20 are formed at positions that do not overlap each other when the optical films are laminated. On the other hand, as shown in FIG. 5, each of the position restricting protrusions 16 and 23 may be formed at a position that overlaps when the optical films are laminated, and may be locked to a common position restricting recess 17. .

  Next, the operation of the second embodiment will be described.

  According to the present embodiment, by attaching the fixing protrusions 12 and 20 of the diffusion film 11 and the prism sheet 19 to the fixing recesses 13 and 21, only a part of the diffusion film 11 and the prism sheet 19 is framed. 4, even when the diffusion film 11 or the prism sheet 19 expands or contracts due to the environmental temperature or the like, it is possible to prevent the diffusion film 11 or the prism sheet 19 from being wrinkled or bent. .

  Further, in the diffusion film 11 and the prism sheet 19, the fixing protrusions 12 and 20 are fixed to the frame 4, and the position restricting protrusions 16 and 23 are locked to the position restricting recesses 17 and 24 of the frame 4. Thus, the diffusion film 11 and the prism sheet 19 can be supported by the two points of the fixing protrusions 12 and 20 and the position restricting protrusions 16 and 23 in the frame 4. For this reason, since it can control that diffusion film 11 and prism sheet 19 move in the direction of the 3rd side wall 3c and 4th side wall 3d in frame 4, the 3rd side of diffusion film 11 and prism sheet 19 can be controlled. The side 11c and the fourth side 11d can be prevented from coming into contact with the inner surfaces of the third side wall 3c and the fourth side wall 3d of the frame 4.

  Therefore, by preventing generation of wrinkles and the like of the diffusion film 11 and the prism sheet 19, the backlight unit 1 can uniformly irradiate the display panel with the irradiation light, so that the optical characteristics of the display panel are deteriorated. Can be prevented. At the same time, the area where the third side edge 11c and the fourth side edge 11d of the diffusion film 11 and the prism sheet 19 are in contact with the inner surfaces of the third side wall 3c and the fourth side wall 3d of the frame 4 is reduced and further contacted. By preventing this, it is possible to prevent occurrence of noise called rattle noise in the backlight unit 1.

  In addition, this invention is not limited to the said embodiment, A various change is possible as needed.

  For example, in the present embodiment, as the film side position regulating locking portion, the position regulating projection 16 formed to protrude from one side of the film is used, and as the frame side position regulating locking portion, the frame 4 Although the description has been made using the concave portion 17 for position regulation formed in a concave shape on the top surface of the stepped portion 5 in the one side wall 3, it is not limited to this. For example, the film side position restricting locking portion is a position restricting notch formed by notching a part of one side of the film in a range that does not affect the display on the display panel. The portion may be a position restricting protrusion that protrudes into a portion of the side wall 3 of the frame 4 that faces the position restricting notch and is loosely fitted into the position restricting notch. At this time, a gap between the protrusion side that is arranged in a non-orthogonal direction with respect to the protruding direction of the position restricting protrusion and the inner surface of the notch portion facing the protrusion side of the position restricting notch. The dimensions of the side of the optical film are a non-orthogonal side arranged in a non-orthogonal direction with respect to the protrusion side, and an inner surface of the side wall facing the non-orthogonal side of the frame. It is good to form shorter than the gap dimension.

  Further, the position and shape of the position restricting protrusion 16 and the position restricting concave portion 17 are not limited to the present embodiment. For example, the position restricting protrusion 16 has a triangular shape or a substantially semicircular shape in plan view. You may form so that it may become. Furthermore, various optical films can be used for the optical film, and the number of laminated films is not limited to this embodiment.

  Further, in this embodiment, the optical film is fixed in position in the frame 4 by directly sticking the position restricting protrusions 16 to the frame 4, but means for fixing the optical film in the frame 4. Is not limited to this embodiment. For example, the optical film may be fixed in the frame 4 by adhering the optical film position regulating protrusion 16 to the light guide plate 8 and adhering the light guide plate 8 to the frame 4.

The typical top view showing one embodiment of the light unit concerning the present invention Typical sectional drawing in AA of the light unit of FIG. The typical top view which expands and shows the position control protrusion of the light unit of FIG. Schematic top view which shows other embodiment of the light unit which concerns on this invention. Schematic top view which shows other embodiment of the light unit which concerns on this invention. Schematic plan view showing an example of a conventional light unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light unit 2 Bottom plate 3 Side wall 3a 1st side wall 4b 2nd side wall 4c 3rd side wall 3d 4th side wall 4 Frame 5 Level difference part 5a 1st level difference part 5b 2nd level difference part 11 Diffusion film 11a 1st side 11b 2nd side Side 11c Third side 11d Fourth side 12 Fixing protrusion 13 Fixing recess 16 Position control protrusion 16a Chamfer 16b First protrusion side 16c Second protrusion side 17 Position control recess 17a Chamfer Opposing part 17b First recess side inner surface 17c Second recess side inner surface

Claims (4)

In a light unit having an optical film having a plurality of side edges, and a frame having a side wall disposed to face the side edges of the optical film and containing the optical film,
One side of the plurality of sides is attached to the frame,
At least one side of the remaining sides is formed with a film side position restricting locking portion for restricting the arrangement position of the optical film in the frame,
A frame-side position restricting locking portion that is locked to the film-side position restricting locking portion is formed at a position facing the film-side position restricting locking portion of the side wall of the frame. The light side unit is characterized in that the film side position regulating latching portion and the frame side position regulating latching portion are not attached to each other.   The film side position restricting locking portion is a position restricting protrusion formed protruding from the side, and the frame side position restricting locking portion has a concave surface facing the optical film on the side wall. The light unit according to claim 1, wherein the light control unit is a formed position regulating recess.   The film side latching portion side that is disposed in a direction other than the protruding direction of the film side position regulating latching portion and the frame side position regulating latching portion that opposes the film side latching portion side. The gap between the frame side locking portion inner surface and the non-protruding direction side arranged in a direction other than the protruding direction of the film side position regulating locking portion among the remaining sides, and the frame out of the frame The light unit according to claim 2, wherein the light unit is formed to be shorter than a gap dimension with an inner surface of the side wall facing the side in the non-projecting direction.   The film side position restricting locking portion is formed in a rectangular shape in plan view, and one corner on the protruding side of the film side position restricting locking portion is chamfered so that the shape is different from the other corner. A chamfered portion, and a portion of the inner surface of the frame side position regulating locking portion that faces the chamfered portion is formed so as to be close to the shape of the chamfered portion. The light unit according to claim 2, wherein the light unit is a facing portion.

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