JP2005243572A - Backlight unit and method of fixing film member - Google Patents
Backlight unit and method of fixing film member Download PDFInfo
- Publication number
- JP2005243572A JP2005243572A JP2004054946A JP2004054946A JP2005243572A JP 2005243572 A JP2005243572 A JP 2005243572A JP 2004054946 A JP2004054946 A JP 2004054946A JP 2004054946 A JP2004054946 A JP 2004054946A JP 2005243572 A JP2005243572 A JP 2005243572A
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- Prior art keywords
- backlight unit
- light
- film
- case
- sided tape
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- 239000004973 liquid crystal related substances Substances 0.000 abstract description 10
- 239000010408 films Substances 0.000 description 32
- 230000002093 peripheral Effects 0.000 description 11
- 230000001070 adhesive Effects 0.000 description 3
- 239000000853 adhesives Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000034 methods Methods 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 239000006072 pastes Substances 0.000 description 1
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Abstract
Description
The present invention relates to a backlight unit and a method for fixing a film member, and more particularly, to a method for fixing a film member to a reflective case with a frame-shaped light shielding tape.
FIG. 7 is an exploded perspective view showing the structure of a conventional backlight unit used as a backlight for a liquid crystal display panel (not shown). As shown in the figure, in this backlight unit, the film member 2 and the light guide plate 4 are accommodated in the reflection case 3. The film member 2 is fixed to the reflection case 3 by the frame-shaped light-shielding double-sided tape 1. A reflective sheet 5 is attached to the lower surface of the reflective case 3. The frame-shaped light-shielding double-sided tape 1 functions as a light-shielding member that prevents luminance unevenness in which the brightness suddenly increases at the peripheral edge of the display area of the liquid crystal display panel. The configuration of such a conventional liquid crystal display device is described in Patent Document 1, for example.
FIG. 8 shows a top view of a conventional backlight unit. In FIG. 8, A is an overlap portion (hereinafter referred to as adhesive margin A) between the film member 2 and the frame-shaped light-shielding double-sided tape 1, and B is an overlap portion between the frame-shaped light-shielding double-sided tape 1 and the reflective case 3. (Hereinafter referred to as paste margin B). As shown in FIG. 8, the inner peripheral dimension of the light-shielding double-sided tape 1 is slightly smaller than the outer peripheral dimension of the film member 2 and the outer peripheral dimension is larger than the outer peripheral dimension. It was a glue allowance.
As described above, in the conventional liquid crystal display device and the like, the film member is fixed to the frame-shaped reflection case with the adhesive margin B. However, with the recent increase in the effective display area of liquid crystal display devices and the narrowing of the peripheral frame, it has become difficult to ensure a sufficient margin B, and the film member and the reflective case There is a problem that sufficient strength cannot be obtained for fixing a film member constituting the backlight unit, such as a reflection sheet provided in contact with the lower surface of the backlight unit.
An object of the present invention is to solve such a problem and fix a backlight unit having sufficient strength in fixing a film member constituting a backlight unit such as a liquid crystal display device, and a film member constituting the backlight unit. It is to provide a method.
The backlight unit according to the present invention is a backlight unit in which a film member is fixed to a frame-shaped reflection case with a frame-shaped light-shielding tape in a state where the outer edge portion is placed. A backlight unit having an extended portion that is bonded to both the outer edge portion of the film member and the frame-shaped reflective case, and extends to the outer surface of the frame-shaped reflective case on at least one side thereof. It is. With such a configuration, it is possible to ensure sufficient strength in fixing the members constituting the backlight unit.
Furthermore, the extending part of the light shielding tape may be extended and bonded to the lower surface of the reflecting case. With such a configuration, it is possible to secure a sufficient strength in fixing the members constituting the backlight unit.
The backlight unit further includes a reflection sheet provided in contact with the lower surface of the reflection case, and an extension portion of the light shielding tape is bonded to the reflection sheet so that the reflection sheet is attached to the reflection case. It may be fixed. With such a configuration, not only the film member but also the reflection sheet can be fixed by the same member.
Here, the backlight unit further includes a reflection sheet provided in contact with the lower surface of the reflection case, and the lower surface of the reflection case is substantially flush with the lower surface of the reflection sheet and the outer surface of the light shielding tape. Alternatively, it may have a cutout portion cut out so as to be inside, and the extending portion of the light shielding tape may be positioned in the cutout portion. With such a configuration, it is possible to secure sufficient strength in fixing the members constituting the backlight unit, and to prevent the enlargement of the outer dimensions due to the extension of the light shielding tape.
Or you may have a notch part notched so that the outer surface of the said light shielding tape may be located in the substantially same surface or inner side as the outer surface of the said reflection case in the outer surface of the said reflection case. With such a configuration, it is possible to secure sufficient strength in fixing the members constituting the backlight unit, and to prevent the enlargement of the outer dimensions due to the extension of the light shielding tape.
On the other hand, the extending part of the light shielding tape may be provided on each of the opposing sides. With such a configuration, it is possible to further ensure sufficient strength in fixing the members constituting the backlight unit.
The method of fixing the members constituting the backlight unit according to the present invention is a method of fixing a film member to a frame-shaped reflective case with a frame-shaped light shielding tape in a state where the outer edge portion is placed on the backlight. The film member is fixed by adhering a protruding portion protruding from at least one side of the light-shielding tape to the outer surface of the frame-shaped reflection case. By such a method, it is possible to secure sufficient strength in fixing the members constituting the backlight unit.
ADVANTAGE OF THE INVENTION According to this invention, the method of fixing the backlight unit which has sufficient intensity | strength in fixation of the film member which comprises the backlight unit of a liquid crystal display device, and the film member which comprises the said backlight unit can be provided. .
Embodiment 1 of the Invention
First, the configuration of the backlight unit according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a top view of a backlight unit according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a side having an extending portion 11 or 12 of a light-shielding double-sided tape 1. As shown in FIG. 1, the backlight unit according to the embodiment of the present invention is provided with the extending portions 11 and 12 of the light-shielding double-sided tape 1 on each of the opposite sides in the left-right direction. As long as it is provided. As shown in FIG. 2, the backlight unit according to the embodiment of the present invention includes a light-shielding double-sided tape 1, a film member 2, a reflective case 3, a light guide plate 4, and a reflective sheet 5. The film member 2 includes a diffusion film and other optical films that uniformly diffuse light rays from a light source on the display screen. 1a is an upper surface portion of the light-shielding double-sided tape 1, 1b is an outer surface extending portion, and 1c is a lower surface extending portion. That is, in the present embodiment, the film is formed by the extending portions 11 and 12 of the light-shielding double-sided tape 1 attached to the peripheral edge of the film member 2 and the upper surface, outer surface and lower surface of the reflection case 3 and the edge of the reflection sheet 5. The member 2 and the reflection sheet 5 are fixed to the reflection case 3. The light-shielding double-sided tape only needs to have a light-shielding property, and is not necessarily black.
As shown in FIG. 2, the light-shielding double-sided tape 1 used in this embodiment is attached so as to cover the peripheral edge of the film member 2 and the upper, outer and lower surfaces of the reflecting case 3 and the outer edge of the reflecting sheet 5. The film member 2 is fixed to the reflection case 3 with the light-shielding double-sided tape upper surface portion 1a and the outer surface extension portion 1b, and the reflection sheet 5 is fixed to the reflection case 3 with the extension portion 1c. It has two functions of preventing bright lines generated at the peripheral edge of a certain film member 2, that is, the peripheral edge of the display area of the liquid crystal display element, and preventing the film member 2 from shifting.
According to the present embodiment, the light-shielding double-sided tape 1 has the extending portions 11 and 12, so that not only the upper surface of the reflective case 3 as in the prior art, but also the outer surface is provided by the light-shielding double-sided tape outer surface extending portion 1b. Since the lower surface is extended and bonded to the end portion of the reflection sheet 5 by the light-shielding double-sided tape lower surface extending portion 1c, the effective display area of a liquid crystal display device in recent years is enlarged and its peripheral portion The film member 2 and the reflective case 3 are fixed in a state in which the strength is secured more than the conventional adhesion only on the upper surface of the reflective case 3 in order to reduce the adhesive area accompanying the narrowing of the frame. The seat 5 can be fixed.
Embodiment 2 of the Invention
Next, the configuration of the backlight unit according to the second embodiment of the present invention will be described with reference to FIG. The overall configuration of the backlight unit according to the embodiment of the present invention is the same as that of the first embodiment, and thus the description thereof is omitted. However, the light-shielding double-sided tape extending portions 11 and 12 are provided on the outer surface of the reflecting case 3. That is, it has a feature in that it has an extending portion 1b.
According to the present embodiment, while the first embodiment extends the light-shielding double-sided tape extending portions 11 and 12 to the lower surface of the reflective case 3, the work process is simplified by being up to the outer surface of the reflective case 3. The cost can be reduced. Furthermore, the enlargement of the outer dimension to the lower surface by turning the light-shielding double-sided tape extending portions 11 and 12 around the lower surface of the reflecting case 3 can be eliminated.
Embodiment 3 of the Invention
Next, a backlight unit according to Embodiment 3 of the present invention will be described with reference to FIG. The overall configuration of the backlight unit according to the embodiment of the present invention is the same as that of the first embodiment, and the description thereof will be omitted. However, the light-shielding double-sided tape lower surface extending portion 1c is provided at the end of the reflection sheet 5. The lower surface of the reflecting case 3 is cut out so that the lower surface of the reflecting sheet 5 and the lower surface extending portion 1c of the light-shielding double-sided tape 1 are substantially flush with each other. It has the part 3a, and the lower surface extension part 1c of the light-shielding double-sided tape 1 is located in the lower surface notch part 3a.
According to the present embodiment, in the first embodiment, the light-shielding double-sided tape extending portions 11 and 12 extend to the end of the reflecting sheet 5, but to the lower surface of the reflecting case 3. Since the lower surface of the reflection case 3 has a cutout portion 3a that is cut out so that the lower surface of the reflection sheet 5 and the outer surface of the lower surface extending portion 1c of the light-shielding double-sided tape 1 are substantially flush with each other, The enlargement of the outer dimension due to the extension can be prevented. In addition, you may make it provide the notch part 3a so that the lower surface extension part 1c of a light-shielding double-sided tape may be located inside the lower surface of the reflective sheet 5 further.
Embodiment 4 of the Invention
Next, a backlight unit according to Embodiment 4 of the present invention will be described with reference to FIG. The configuration of the backlight unit according to the fourth embodiment of the present invention is the same as that shown in any one of the first to third embodiments, and a description thereof will be omitted.
The view shown in FIG. 5 is a view of the backlight unit according to the embodiment of the present invention as viewed from directly above, and the lower part of AA ′ is displayed through the light-shielding double-sided tape 1. Reference numeral 3 b denotes a cutout portion on the outer surface of the reflection case 3, and the reflection case cutout portion 3 b is provided so that the outer surface of the light-shielding double-sided tape extending portion 12 is substantially flush with or on the inner side of the reflection case 3. It is characterized by being.
According to the present embodiment, the outer surface of the reflective case 3 is cut out so that the outer surfaces of the extending portions 11 and 12 of the light-shielding double-sided tape 1 are located on the same side or the inner side of the outer surface of the reflective case 3. By providing the notch portion 3b, the enlargement of the outer dimension due to the extending portion 12 of the light shielding tape 1 can be prevented.
Embodiment 5 of the Invention
Next, a backlight unit according to Embodiment 5 of the present invention will be described with reference to FIG. The configuration of the backlight unit according to the fifth embodiment of the present invention is the same as that of any one of the first to fourth embodiments, and a description thereof will be omitted.
6 is a view of the backlight unit according to the embodiment of the present invention as viewed from directly above. Reference numerals 11, 12, and 13 denote extending portions of the light-shielding double-sided tape 1, respectively. As shown in FIG. 6, in FIG. 1, the extension part which was only two sides facing in the left-right direction is characterized by three sides. With such a configuration, it is possible to further ensure the strength in fixing the film member constituting the backlight unit, as compared with the first to fourth embodiments.
Other embodiments.
In the above-described example, the light-shielding double-sided tape 1 is used to fix the film member 2, but the double-sided tape is not necessarily required, and only one side may have adhesiveness. In the present invention, it is necessary to bend the light-shielding double-sided tape 1 at the corners of the reflection case 3, but it is also possible to provide a perforation cut in a dotted line so as to be surely bent at this bent portion.
DESCRIPTION OF SYMBOLS 1 Light-shielding double-sided tape 1a Light-shielding double-sided tape upper surface part 1b Light-shielding double-sided tape outer surface extension part 1c Light-shielding double-sided tape lower surface extension part 11 Light-shielding double-sided tape extension part 12 Light-shielding double-sided tape extension part 2 Film member 3 Reflective case 3a Reflective case Bottom cutout portion 3b Reflection case outer side cutout portion 4 Light guide plate 5 Reflection sheet
Claims (7)
- A backlight unit in which the film member is fixed by a frame-shaped light-shielding tape in a state where the outer edge portion is placed on the frame-shaped reflection case,
The shading tape is bonded to both the outer edge portion of the film member and the reflection case, and has an extending portion that extends and adheres to the outer surface of the frame-shaped reflection case at least on one side thereof. Backlight unit. - The backlight unit according to claim 1, wherein the extending portion of the light shielding tape extends to the lower surface of the reflection case and is bonded thereto.
- The backlight unit further includes a reflective sheet provided in contact with the lower surface of the reflective case,
The backlight unit according to claim 2, wherein the extending portion of the light shielding tape is bonded to the reflective sheet, and the reflective sheet is fixed to the reflective case. - The backlight unit further includes a reflective sheet provided in contact with the lower surface of the reflective case,
The lower surface of the reflection case has a cutout portion that is cut out so that the outer surface of the light shielding tape is substantially the same surface or the inner side of the lower surface of the reflection sheet, and the light shielding tape extends to the cutout portion. The backlight unit according to claim 2, wherein the portion is located. - The outer surface of the reflection case has a notch portion that is cut out so that the outer surface of the light shielding tape is substantially flush with or inside the outer surface of the reflection case. Backlight unit.
- 6. The backlight unit according to claim 1, wherein the extending portion of the light shielding tape is provided on each of both opposing sides.
- In the backlight, a method of fixing the film member to the frame-shaped reflection case with the frame-shaped light shielding tape in a state where the outer edge portion is placed,
A film member fixing method for fixing a film member by adhering a protruding portion protruding from at least one side of the light-shielding tape to an outer surface of the frame-shaped reflection case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004054946A JP2005243572A (en) | 2004-02-27 | 2004-02-27 | Backlight unit and method of fixing film member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004054946A JP2005243572A (en) | 2004-02-27 | 2004-02-27 | Backlight unit and method of fixing film member |
Publications (1)
| Publication Number | Publication Date |
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| JP2005243572A true JP2005243572A (en) | 2005-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004054946A Pending JP2005243572A (en) | 2004-02-27 | 2004-02-27 | Backlight unit and method of fixing film member |
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| JP (1) | JP2005243572A (en) |
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008068935A1 (en) * | 2006-12-04 | 2008-06-12 | Sharp Kabushiki Kaisha | Light source unit and display device |
| WO2008068936A1 (en) * | 2006-12-06 | 2008-06-12 | Sharp Kabushiki Kaisha | Light source unit and display device |
| KR20110064876A (en) * | 2009-12-09 | 2011-06-15 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN102155692A (en) * | 2011-04-13 | 2011-08-17 | 苏州向隆塑胶有限公司 | Backlight module and assembling method thereof |
| US8274623B2 (en) | 2009-06-16 | 2012-09-25 | Au Optronics Corporation | Liquid crystal display and method for assembling the same |
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| CN105677113A (en) * | 2016-03-02 | 2016-06-15 | 昆山龙腾光电有限公司 | Manufacturing method for touch display panel |
| KR101838055B1 (en) | 2016-04-15 | 2018-04-26 | (주)넥스디스플레이 | Display unit for decreasing of thickness of bezel |
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