JP2005228540A - Sidelight type surface light source device - Google Patents

Sidelight type surface light source device Download PDF

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Publication number
JP2005228540A
JP2005228540A JP2004034503A JP2004034503A JP2005228540A JP 2005228540 A JP2005228540 A JP 2005228540A JP 2004034503 A JP2004034503 A JP 2004034503A JP 2004034503 A JP2004034503 A JP 2004034503A JP 2005228540 A JP2005228540 A JP 2005228540A
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Japan
Prior art keywords
light
guide plate
light guide
reflecting
light source
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Pending
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JP2004034503A
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Japanese (ja)
Inventor
Koji Yoshikawa
浩司 吉川
Original Assignee
Miyota Kk
ミヨタ株式会社
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Priority to JP2004034503A priority Critical patent/JP2005228540A/en
Publication of JP2005228540A publication Critical patent/JP2005228540A/en
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Abstract

An object of the present invention is to eliminate the waste of light emitted from a light source, effectively use the emitted light, and improve the luminance of a sidelight type surface light source device.
A light guide plate having at least a light incident surface and a light emitting surface for emitting light incident from the light incident surface in a planar shape, and disposed on a surface side facing the light emitting surface of the light guide plate. Side light type surface light source device comprising a first reflecting member, an optical member disposed on the light emitting surface side of the light guide plate, and a light source that emits light toward the light incident surface of the light guide plate In the above, a side light type surface light source device in which a second reflecting member is provided at a peripheral portion on the light emitting surface side of the light guide plate.
[Selection] Figure 1

Description

  The present invention relates to a sidelight type surface light source device.

  FIG. 9 is an exploded perspective view showing the basic structure of a conventional sidelight type surface light source device, and FIG. 10 is a cross-sectional view seen from the direction of arrow A in FIG. Reference numeral 1 denotes a light source, for example, a light emitting diode (LED). The light source 1 is mounted on a flexible substrate 8, and the flexible substrate 8 on which the light source 1 is mounted is fixed to a side end portion (light incident surface) of the light guide plate 3 with a double-sided tape 7.

  Reference numeral 5 denotes a case, in which the reflecting member 2 is disposed at the bottom of the case 5, and the light guide plate 3 is disposed on the reflecting member 2. The light source 1 is disposed on the light incident surface side of the light guide plate 3, and the optical member 4 is disposed on the light exit surface side of the light guide plate 3. Reference numeral 6 denotes a chassis having an opening light emitting area 9, which covers the light emitting surface side of the light guide plate 3 so as to correspond to the opening light emitting area 9, thereby forming a sidelight type surface light source device.

  The reflection member 2 is formed in a sheet shape and is a member having a high reflectance. The reflection member 2 is formed by depositing metal particles such as silver on a polyester, polyolefin, or resin sheet, for example.

  The optical member 4 is formed by laminating several kinds of sheet-like members. In FIGS. 9 and 10, a diffusion sheet, a vertical prism sheet, and a horizontal prism sheet are stacked in this order on the light output surface of the light guide plate 3. Is arranged.

  The above-described sidelight type surface light source device includes a reflective member 2 (upper reflective surface) having a high reflectance on the surface side (the lower surface side of the light guide plate 3) facing the light emitting surface of the light guide plate 3 housed in the case 5. ), The light emitted from the light source 1 passes through the light guide plate 3 while being reflected upward by the reflecting member 2. The light launched from the light guide plate 3 passes through the optical member 4 to be adjusted in the emission direction, and is emitted from the opening light emitting area 9 of the chassis 6 to the outside. This device is used as a surface light source device of a liquid crystal display device (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-229022 (pages 5-6, FIG. 1)

  The sidelight type surface light source device shown in the background art emits light from the light guide plate 3 in a portion other than the opening light emitting area 9 of the chassis 6 (peripheral portion on the light exit slope side of the light guide plate 3) or in the vicinity of the back surface of the light source 1. In many cases, a part of the emitted light is wasted because it escapes to the outside or is absorbed by the components such as the chassis 6 itself. As a result, there is a problem that the luminance cannot be increased without effective use of light.

  An object of the present invention is to eliminate the waste of light emitted from a light source, to effectively use the emitted light, and to improve the luminance of the sidelight type surface light source device.

  A light guide plate having at least a light incident surface and a light output surface for emitting light incident from the light incident surface in a planar shape; and a first surface disposed on a surface side of the light guide plate facing the light output surface. A side light type surface light source device comprising: a reflecting member; an optical member disposed on a light emitting surface side of the light guide plate; and a light source that emits light toward a light incident surface of the light guide plate. A side light type surface light source device is provided in which a second reflecting member is provided at a peripheral portion of the light plate on the light emitting surface side.

  The first reflecting member and the second reflecting member are integrally formed with a sheet-like member, and an opening for emitting light is provided at one end of the integrally formed sheet-like reflecting member, and the opening is One end portion not provided is disposed on the surface side facing the light exit surface of the light guide plate, and the one end portion provided with the opening is disposed on the light exit surface side of the light guide plate. The side light type surface light source device is formed by wrapping a light plate with the sheet-like reflecting member in a roll shape.

  The light guide plate, a first reflecting member disposed on a surface facing the light exit surface of the light guide plate, an optical member disposed on the light exit surface side of the light guide plate, and light incident on the light guide plate A light source that emits light toward the surface is disposed in the case, and a chassis having an opening is placed over the light emitting surface of the light guide plate disposed in the case. The side light type surface light source device in which the reflective member is formed.

  The case and the chassis are integrally formed to form an exterior case, and the exterior case is directed to the light guide plate, an optical member disposed on a light exit surface side of the light guide plate, and a light incident surface of the light guide plate. It has an insertion port for inserting and arranging a light source that emits light, and an opening for emitting light from the light emitting surface of the light guide plate, and a reflection member is formed inside the exterior case A side light type surface light source device is used.

  Since the second reflecting member is provided at the peripheral portion on the light emitting surface side of the light guide plate, the amount of light reflected and returned again into the light guide plate is increased, so that the light use efficiency is increased, so that the luminance can be improved. it can.

  The first reflecting member and the second reflecting member are integrally formed with a sheet-like member, and an opening for emitting light is provided at one end of the integrally formed sheet-like reflecting member, and the opening is provided. The light guide plate is arranged such that one end portion that is not provided is disposed on the side of the light guide plate facing the light exit surface, and the end portion provided with the opening is disposed on the light exit surface side of the light guide plate. Since the sheet-like reflecting member is wrapped in a roll shape, the amount of light returned into the light guide plate can be increased and the luminance can be improved. Furthermore, according to this configuration, the number of parts can be reduced by one.

  A light guide plate, a light source, a first reflecting member, and an optical member are housed in a case, and a chassis having an opening is placed over the light output surface of the light guide plate. Since the reflective member is formed, the amount of light returned into the light guide plate can be increased and the luminance can be improved. Furthermore, according to this configuration, the number of parts can be reduced by one, and the thickness of the apparatus can be further reduced.

  A case and the chassis are integrally formed to form an exterior case, and the exterior case includes an optical member disposed on a light exit surface side of the light guide plate and the light guide plate, and light directed toward a light incident surface of the light guide plate. Since there is an insertion port for inserting and arranging a light source that emits light, and an opening for emitting light from the light emission surface of the light guide plate, and further, a reflective member is formed inside the exterior case, The amount of light returned into the light guide plate can be increased and the luminance can be improved. Furthermore, according to this configuration, the number of parts can be reduced by two, and the thickness of the apparatus can be further reduced.

  By adopting a structure in which a reflecting member is also provided in the peripheral part on the light emitting surface side of the light guide plate, the amount of light is increased by reusing the light that has been wasted in the past back to the light guide plate side and reusing it, Improved brightness.

  FIG. 1 is an exploded perspective view showing a side light type surface light source device according to a first embodiment of the present invention. 2 is a cross-sectional view seen from the direction of arrow A in FIG. Parts similar to those of the conventional configuration will be described using the same reference numerals (hereinafter the same). Reference numeral 1 denotes a light source, for example, a light emitting diode (LED). The light source 1 is mounted on a flexible substrate 8, and the flexible substrate 8 on which the light source 1 is mounted is fixed to the side end (light incident surface) side of the light guide plate 3 with a double-sided tape 7.

  Reference numeral 5 denotes a case, in which the first reflecting member 2 is disposed at the bottom of the case 5, and the light guide plate 3 is disposed on the first reflecting member 2. The first reflecting member 2 is a sheet-like member, for example, obtained by evaporating metal particles such as silver on a polyester, polyolefin, or resin sheet. A light source 1 is disposed on the light incident surface side of the light guide plate 3, and an optical member 4 is disposed on the light exit surface side of the light guide plate 3. The optical member 4 is formed, for example, by laminating sheet-like members in the order of a diffusion sheet, a vertical prism sheet, and a horizontal prism sheet from the light emitting surface side of the light guide plate 3. Reference numeral 6 denotes a chassis having an opening light emitting area 9 that covers the light emitting surface side of the light guide plate 3 in correspondence with the opening light emitting area 9. Reference numeral 2 ′ denotes a second reflecting member, which has an opening 2 ′ a, and is arranged on the optical member 4 so that the opening 2 ′ a corresponds to the opening light emitting area 9 of the chassis 6.

  In the side light type surface light source device having the above configuration, the light emitted from the light source 1 passes through the light guide plate 3 while being reflected upward by the first reflecting member 2. Most of the light raised from the light guide plate 3 passes through the optical member 4 so that the light emission direction is adjusted, and is emitted from the opening light emitting area 9 to the outside of the sidelight type surface light source device. At this time, a part of the light rising from the light guide plate 3 that does not pass through the opening light emitting area 9 is reflected downward by the second reflecting member 2 ′ (lower reflective surface). The light reflected thereby is once returned into the light guide plate 3 and is reused by being reflected by the first reflecting member 2 again. With this configuration, waste of light can be eliminated, the amount of light can be increased, and the luminance can be improved.

  FIG. 3 is an exploded perspective view showing a side light type surface light source device according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view seen from the direction of arrow A in FIG. In the second embodiment, the first reflecting member and the second reflecting member shown in the first embodiment are integrally formed to constitute a sidelight type surface light source device. 11 is a sheet-like reflection member. An opening 11a for emitting light is provided at one end of the sheet-like reflecting member 11, and the one end where the opening 11a is not provided is the surface facing the light emitting surface of the light guide plate 3 (light guide plate The light guide plate 3 is arranged on the light emitting surface side of the light guide plate 3 so that one end portion where the opening 11a is continuously provided is arranged on the light emitting surface side of the light guide plate 3. Wrapped in a roll shape. In this embodiment, the light source 1 is also encased.

  The light emitted from the light source 1 passes through the light guide plate 3 while being reflected upward at a portion immediately below the light guide plate 3 of the sheet-like reflecting member 11. Most of the light raised from the light guide plate 3 passes through the optical member 4 so that the light emission direction is adjusted, and is emitted from the opening light emitting area 9 to the outside of the sidelight type surface light source device. At this time, a part of the light rising from the light guide plate 3 that does not pass through the opening light emitting area 9 is reflected downward by the sheet-like reflecting member 11 disposed on the optical member 4. Furthermore, according to this structure, the light leaked to the back surface portion of the light source 1 and its periphery is also reflected toward the light guide plate 3 by the roll-shaped portion of the sheet-like reflecting member 11. These reflected lights are reused by being returned into the light guide plate 3. With this configuration, light is not wasted, the amount of light can be further increased, and luminance can be improved.

  FIG. 5 is an exploded perspective view showing a sidelight type surface light source device according to a third embodiment of the present invention. FIG. 6 is a cross-sectional view seen from the direction of arrow A in FIG. The configuration of the third embodiment of the present invention is substantially the same as the configuration shown in the prior art, but a reflection surface 6a having a higher reflectance than usual is formed inside the chassis 6. In order to form a reflective surface having a high reflectance, there are the following methods as specific examples. One is a method of forming a glossy surface having a very high reflectivity by performing bright heat treatment or skin pass finishing after cold rolling a stainless steel plate. The other is a method in which the surface of the stainless steel plate is mirror-polished with a very fine abrasive. The other is a method of forming a glossy surface by depositing metal particles such as silver on a base material of a steel material such as stainless steel. One is a method of forming a glossy surface by bonding a white reflective polyester layer to a base material of a steel material such as stainless steel. With this configuration, the light emitted from the light source 1 passes through the light guide plate 3 while being reflected upward by the first reflecting member 2. Most of the light raised from the light guide plate 3 passes through the optical member 4 so that the light emission direction is adjusted, and is emitted from the opening light emitting area 9 to the outside of the sidelight type surface light source device. At this time, a part of the light rising from the light guide plate 3 that does not pass through the opening light emitting area 9 is reflected downward by the reflection surface 6 a formed inside the chassis 6. The reflected light is reused by being returned into the light guide plate 3. With this configuration, waste of light can be eliminated, the amount of light can be increased, and the luminance can be improved.

  FIG. 7 is an exploded perspective view showing a side light type surface light source device in a fourth embodiment of the present invention. 8 is a cross-sectional view seen from the direction of arrow A in FIG. Reference numeral 12 denotes an exterior case. The exterior case 12 includes a light guide plate 3, an optical member 4 disposed on the light exit surface side of the light guide plate 3, and a light source 1 that emits light toward the light incident surface of the light guide plate 3. And an opening 12e for emitting light from the light exit surface of the light guide plate 3. Further, a reflective surface 12 c having a high reflectance is formed inside the outer case 12. In order to form a reflective surface having a high reflectance, there are the following methods as specific examples. One is a method of forming a glossy surface having a very high reflectivity by performing bright heat treatment or skin pass finishing after cold rolling a stainless steel plate. The other is a method in which the surface of the stainless steel plate is mirror-polished with a very fine abrasive. The other is a method of forming a glossy surface by depositing metal particles such as silver on a base material of a steel material such as stainless steel. One is a method of forming a glossy surface by bonding a white reflective polyester layer to a base material of a steel material such as stainless steel. The light emitted from the light source 1 passes through the light guide plate 3 while being reflected by the reflecting surface 12 c on the inner lower surface of the exterior case 12. Most of the light raised from the light guide plate 3 passes through the optical member 4 to adjust the light emission direction, and is emitted from the opening light emitting area 12a to the outside of the sidelight type surface light source device. At this time, a part of the light rising from the light guide plate 3 that does not pass through the opening light emitting area 12 a is reflected downward by the reflecting surface 12 c on the inner upper surface of the outer case 12. The reflected light is reused by being returned into the light guide plate 3. With this configuration, waste of light can be eliminated, the amount of light can be increased, and the luminance can be improved.

  In addition, the light leaking to the rear surface of the light source 1 and the periphery thereof is also reflected in the direction of the light guide plate 3 by the reflecting surface (not shown) inside the U-shape of the reflector 10. These reflected lights are reused by being returned into the light guide plate 3. In this embodiment, a sheet-like reflecting member can be omitted by forming a reflecting surface inside the outer case.

1 is an exploded perspective view showing a side light type surface light source device of the present invention (Example 1). Sectional view seen from the direction of arrow A in FIG. 1 (Example 1) An exploded perspective view showing a sidelight type surface light source device of the present invention (Example 2) Sectional view seen from the direction of arrow A in FIG. 3 (Example 2) An exploded perspective view showing a side light type surface light source device of the present invention (Example 3) Sectional view seen from the direction of arrow A in FIG. 5 (Example 3) (Example 4) The disassembled perspective view which shows the sidelight type surface light source device of this invention. Sectional view seen from the direction of arrow A in FIG. 7 (Example 4) An exploded perspective view showing a basic structure of a conventional sidelight type surface light source device Sectional view seen from the direction of arrow A in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 2 1st reflection member 2 '2nd reflection member 2'a Opening part 3 Light guide plate 4 Optical member 5 Case 6 Chassis 6a Reflecting surface 7 Double-sided tape 8 Flexible board 9 Opening part Light emission area 10 Reflector 11 Reflecting member 11a Opening portion 12 Exterior case 12a Opening light emitting area 12b Insertion port 12c

Claims (4)

  1.   A light guide plate having at least a light incident surface and a light output surface for emitting light incident from the light incident surface in a planar shape; and a first surface disposed on a surface side of the light guide plate facing the light output surface. A side light type surface light source device comprising: a reflecting member; an optical member disposed on a light emitting surface side of the light guide plate; and a light source that emits light toward a light incident surface of the light guide plate. A sidelight type surface light source device, characterized in that a second reflecting member is provided at a peripheral portion on the light emitting surface side of the light plate.
  2.   The first reflecting member and the second reflecting member are integrally formed with a sheet-like member, and an opening for emitting light is provided at one end of the integrally formed sheet-like reflecting member, and the opening is One end portion not provided is disposed on the surface side facing the light exit surface of the light guide plate, and the one end portion provided with the opening is disposed on the light exit surface side of the light guide plate. 2. The side light type surface light source device according to claim 1, wherein a light plate is formed by wrapping the sheet plate in a roll shape with the sheet-like reflecting member.
  3.   The light guide plate, a first reflecting member disposed on a surface facing the light exit surface of the light guide plate, an optical member disposed on the light exit surface side of the light guide plate, and light incident on the light guide plate A light source that emits light toward the surface is disposed in the case, and a chassis having an opening is placed over the light emitting surface of the light guide plate disposed in the case. The side light type surface light source device according to claim 1, wherein a reflective member is formed.
  4. The case and the chassis are integrally formed to form an exterior case, and the exterior case is directed to the light guide plate, an optical member disposed on the light emitting surface side of the light guide plate, and a light incident surface of the light guide plate. It has an insertion port for inserting and arranging a light source for emitting light, and an opening for emitting light from the light emitting surface of the light guide plate, and a reflection member is formed inside the outer case. A side light type surface light source device.
JP2004034503A 2004-02-12 2004-02-12 Sidelight type surface light source device Pending JP2005228540A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
JP2004034503A JP2005228540A (en) 2004-02-12 2004-02-12 Sidelight type surface light source device

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012096204A1 (en) * 2011-01-12 2012-07-19 シャープ株式会社 Illumination device and display device
WO2012096203A1 (en) * 2011-01-12 2012-07-19 シャープ株式会社 Illumination device and display device
WO2015025364A1 (en) * 2013-08-20 2015-02-26 堺ディスプレイプロダクト株式会社 Light source device and display device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012096204A1 (en) * 2011-01-12 2012-07-19 シャープ株式会社 Illumination device and display device
WO2012096203A1 (en) * 2011-01-12 2012-07-19 シャープ株式会社 Illumination device and display device
WO2015025364A1 (en) * 2013-08-20 2015-02-26 堺ディスプレイプロダクト株式会社 Light source device and display device
CN105492942A (en) * 2013-08-20 2016-04-13 堺显示器制品株式会社 Light source device and display device
JPWO2015025364A1 (en) * 2013-08-20 2017-03-02 堺ディスプレイプロダクト株式会社 Light source device and display device
US10031273B2 (en) 2013-08-20 2018-07-24 Sakai Display Products Corporation Light source device and display apparatus
CN105492942B (en) * 2013-08-20 2018-12-21 堺显示器制品株式会社 Light supply apparatus and display device

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