JP3806483B2 - Backlight device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an edge light type backlight device suitable for illuminating a thin display device such as a liquid crystal display device.
[0002]
[Prior art]
An edge-light type backlight device (Japanese Utility Model Laid-Open No. 3-37420) has a linear light source disposed on the side surface of a light guide and a U-shaped flexible reflective sheet surrounding the linear light source. It is bent and arranged. These are assembled by being fixed to the support frame.
[0003]
[Problems to be solved by the invention]
However, in a state where the light guide body, the light source, and the like are arranged on the support frame body, these are not fixed. Therefore, the light guide body, the light source, etc. are detached from the frame body depending on handling until the fixing is performed. As a result, problems such as hindering assembly and damage to the light guide and the light source occur. In addition, when a flexible reflective sheet with a conductive member in which a reflective metal such as aluminum is thinned and sandwiched between insulating transparent films is used as the reflective sheet, the metal portion extends from the end of the reflective sheet. Since it may be exposed, depending on the structure of the display device to be illuminated, a short circuit of the electric circuit component may occur through the exposed metal.
[0004]
Therefore, an object of the present invention is to provide a backlight device with good assembling workability. In addition, when a flexible reflective sheet with a conductive member is used as the reflective sheet, it is an object to prevent a short circuit of an electrical component due to the conductive member. Moreover, when fixing an insulating film for prevention of a short circuit, it is set as one of the subjects to prevent that the reflective function by a reflective sheet falls with the fixation, and to maintain the state of a light-projection surface favorable.
[0005]
[Means for Solving the Problems]
The present invention includes a light guide, a linear light source disposed on a side surface of the light guide, and a flexible reflection bent in a U shape so as to sandwich one end of the light guide and the linear light source. In a backlight device including a sheet and a frame that supports the linear light source so that a light emission surface of the light guide faces downward, the backlight device is positioned on an upper surface side of the light guide. A connecting member made of a film is disposed so as to cover the reflective sheet, and the upper surface of the light guide and the frame are connected via the connecting member, and the fixing position of the light guide and the connecting member is set. It is characterized in that the position where the reflection sheet and the connection member overlap is avoided.
[0006]
The present invention also provides a light guide, a linear light source disposed on a side surface of the light guide, and a conductive member bent in a U shape so as to sandwich one end of the light guide and the linear light source. An insulating film, comprising: a flexible reflection sheet; and a frame that supports the light guide and the linear light source so that a light emitting surface of the light guide faces downward. Is disposed so as to cover the reflection sheet located on the upper surface side of the light guide, and the light guide and the frame are connected via the insulating film, and the light guide and the insulating material are connected. The fixing position of the film is a position that avoids the position where the reflection sheet and the insulating film overlap.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the backlight device 1, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.
[0008]
The backlight device 1 includes a light guide 2, a linear light source 3 disposed on a side surface of the light guide 2, and a U-shape that is sandwiched between one end of the light guide 2 and the linear light source 3. The flexible reflection sheet 4 is provided, and the light guide 2 and the frame 5 that supports the linear light source 3 are arranged so that the light emitting surface 2a of the light guide 2 faces downward.
[0009]
Although the light guide 2 can be constituted only by a transparent light guide plate 6 such as an acrylic plate, in this example, a reflection plate 7 is disposed on the upper surface serving as the light reflecting surface 2b, and the lower surface serving as the light emitting surface 2a. The light diffusion sheet 8 and, if necessary, prism sheets 9 and 9 are laminated.
[0010]
The flexible reflective sheet 4 uses a structure with a conductive member in which a conductive member (metal) such as aluminum having good reflectivity is thinned and sandwiched between transparent films having high electrical insulation. Further, a transparent film having a structure in which an insulating member layer having good reflectivity is added can be used. One end of the reflection sheet 4 is fixed to the light emitting surface 2 a side of the light guide 2 by an adhesive such as a double-sided adhesive, and the other end is attached to the light reflecting surface 2 b side of the light guide 2 such as a double-sided adhesive. It is fixed by an adhesive, and is held in a state where a certain distance is maintained between the light source 3 and the light source 3 so as to surround the light source 3 in an arc shape. Here, in order to increase the reflection efficiency, it is preferable to maintain a constant interval between the light source 3 and the reflection sheet 4 by 1 to 3 ring-shaped interval members 10 attached to the light source 3.
[0011]
The upper surface of the light guide 2 and the side surface of the frame 5 are fixed via a connecting member 11 made of an electrically insulating film. The connecting member 11 is fixed to the frame body 5 by being bent to a side surface side of the frame body 5 and a cover portion 11 a having a size sufficient to cover the reflection sheet 4 positioned on the upper surface side of the light guide body 2. It has a substantially T-shape consisting of the mounting piece 11b. And this connection member 11 fixes the attachment piece 11b to the side surface of the frame 5 first with adhesives 12, such as a double-sided adhesive agent, and then the reflection part 11a is located in the upper surface side of the light guide 2. The sheet 4 is bent so as to cover it, and the tip portion thereof is fixed to the upper surface of the light guide 2 with an adhesive 13 such as a double-sided adhesive. Here, when the connection member 11 and the light guide 2 are fixed on the reflection sheet 4, wrinkles or the like may occur in the reflection sheet 4 due to the force applied to the connection member 11, and the reflection function of the reflection sheet 4 may be reduced. Therefore, in order to prevent this, the fixing position of the connecting member 11 and the light guide 2, that is, the attachment position of the adhesive 13 is set to a position that avoids the position where the reflecting sheet 4 and the connecting member 11 overlap in a plane. . As a result, even if an extra force is applied to the connecting member 11, the force is not applied to the reflection sheet 4, so that the shape of the reflection sheet 4 can be maintained in an initial state with good reflection efficiency.
[0012]
Thus, since the light guide 2 and the frame 5 are connected by the connecting member 11, the connecting member 11 prevents the positional deviation of the light guide 2 with respect to the frame 5 during the assembling work or the light guide 2 is dropped. It works to prevent it.
[0013]
Moreover, even if the conductive member is exposed from a part of the reflective sheet 4 as a result of using the structure including the conductive member as described above as the reflective sheet 4 and sandwiching it between the transparent films, Since the connecting member 11 is made of an insulating film and the cover 11a covers the upper surface of the reflection sheet 4 widely, the electric circuit components can be appropriately arranged on the upper side of the reflection sheet 4. That is, since the connecting member 11 has an electrical insulating function in addition to the connecting function, the area above the connecting member 11 can be used effectively as an arrangement space for the electric circuit components.
[0014]
The backlight device 1 can be used by being incorporated in a display device such as a liquid crystal display device as surface illumination in such an assembled state. However, in order to make the mounted state of the light guide 2 stronger, a separate frame (not shown) for pairing with the frame 5 to sandwich the light guide 2 is prepared. It is preferable that the backlight device 1 is configured by fixing the separate frame body 5 and the frame body 5 with screws or the like so as to be incorporated into the display device.
[0015]
【The invention's effect】
The present invention includes a light guide, a linear light source disposed on a side surface of the light guide, and a flexible reflection bent in a U shape so as to sandwich one end of the light guide and the linear light source. In a backlight device including a sheet and a frame that supports the linear light source so that a light emission surface of the light guide faces downward, the backlight device is positioned on an upper surface side of the light guide. A connecting member made of a film is disposed so as to cover the reflective sheet, and the upper surface of the light guide and the frame are connected via the connecting member. As a result, the assembly workability can be improved. And since the fixing position of the light guide and the connecting member is a position that avoids the position where the reflecting sheet and the connecting member overlap, the reflecting sheet is prevented from being deformed with the fixing of the connecting member, and the reflecting function of the reflecting sheet is improved. It can be kept in a good state.
[0016]
In addition, the present invention also includes a light guide, a linear light source disposed on a side surface of the light guide, and one end of the light guide that is bent into a U shape so as to sandwich the linear light source. A backlight device comprising: a flexible reflective sheet with a conductive member; and a frame that supports the light source and the linear light source so that a light emitting surface of the light guide faces downward In this case, since the insulating film is disposed so as to cover the reflective sheet positioned on the upper surface side of the light guide, the electric circuit component is disposed so as to overlap the reflective sheet, and a part of the conductive member of the reflective sheet is exposed. Even if it has, the short circuit of the electric circuit components by this exposed conductive member can be prevented by the insulating film. And since the light guide and the frame are connected via this insulating film, it is possible to prevent misalignment of the light guide and the frame by the insulating film and to improve the assembly workability. And since the fixing position of the light guide and the insulating film is a position that avoids the position where the reflecting sheet and the insulating film overlap, it is possible to prevent the reflecting sheet from being deformed along with the fixing of the insulating film, The reflection function can be kept in a good state.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a backlight device of the present invention.
2 is an AA enlarged cross-sectional view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Backlight apparatus 2 Light guide 3 Linear light source 4 Reflective sheet 5 Frame 11 Connection member 12 Adhesive 13 Adhesive

Claims (2)

A light guide, a linear light source disposed on a side surface of the light guide, a flexible reflective sheet folded in a U shape so as to sandwich one end of the light guide and the linear light source, and In a backlight device comprising the light guide and a frame that supports the linear light source so that the light exit surface of the light guide faces downward,
A connecting member made of a film is disposed so as to cover the reflective sheet located on the upper surface side of the light guide,
The upper surface of the light guide and the frame are connected via the connecting member, and the fixing position of the light guide and the connecting member is a position that avoids the position where the reflection sheet and the connecting member overlap. A backlight device characterized by. A light guide, a linear light source disposed on a side surface of the light guide, and a flexible member with a conductive member bent in a U shape so as to sandwich one end of the light guide and the linear light source In a backlight device comprising a reflection sheet and a frame that supports the light source and the linear light source so that the light exit surface of the light guide faces downward,
An insulating film is disposed so as to cover the reflection sheet located on the upper surface side of the light guide, and the light guide and the frame are connected via the insulating film, and the light guide and The backlight device characterized in that the fixing position of the insulating film is a position that avoids the position where the reflective sheet and the insulating film overlap.

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