JPH11260140A - Light source structure of display device - Google Patents

Light source structure of display device

Info

Publication number
JPH11260140A
JPH11260140A JP7857298A JP7857298A JPH11260140A JP H11260140 A JPH11260140 A JP H11260140A JP 7857298 A JP7857298 A JP 7857298A JP 7857298 A JP7857298 A JP 7857298A JP H11260140 A JPH11260140 A JP H11260140A
Authority
JP
Japan
Prior art keywords
light
guide plate
light source
fluorescent tube
light guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7857298A
Other languages
Japanese (ja)
Inventor
Maki Tsuji
真樹 辻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP7857298A priority Critical patent/JPH11260140A/en
Publication of JPH11260140A publication Critical patent/JPH11260140A/en
Pending legal-status Critical Current

Links

Landscapes

  • Planar Illumination Modules (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PROBLEM TO BE SOLVED: To lessen the longitudinal dimension of a fluorescent tube in a display device provided with an edge-light type back light. SOLUTION: Inclined parts 8a are provided to both end parts of a reflector 8. Therefore, even if a longitudinal dimension of a fluorescent tube 7 is lessened by a prescribed length, the irradiated light toward the reflector 8 from both end parts of an emitting area 7b of the fluorescent tube 7 is reflected by the inclined parts 8a of the reflector 8, and it is irradiated on a prescribed end face 3a of a light guide plate 3 outside the both end parts of the emitting area 7b of the fluorescent tube 7, thus an emitting area 9 of the light guide plate 3 can emit light approximately evenly.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は表示装置の光源構
造に関する。
The present invention relates to a light source structure of a display device.

【0002】[0002]

【従来の技術】例えば、液晶表示装置には、液晶表示パ
ネルの裏面側にバックライト(光源)が配置されたもの
がある。図2(A)はこのような液晶表示装置の一例を
示す側面図であり、図2(B)はそのバックライトの一
部を切断した平面図である。液晶表示パネル1の裏面側
に配置されたバックライト2は、エッジライト式と呼ば
れるもので、上面が発光面となる導光板3の下面に反射
板4が設けられ、導光板3の上面に拡散板5が設けら
れ、拡散板5の上面にプリズムシート6が設けられ、導
光板3の所定の端面3aの外側に蛍光管(線状光源)7
が配置され、蛍光管7の外周部に大略半円筒状の反射板
8が配置され、この反射板8の所定の両端部が導光板3
の所定の端部の両面に貼り付けられた構造となってい
る。
2. Description of the Related Art For example, some liquid crystal display devices have a backlight (light source) disposed on the back side of a liquid crystal display panel. FIG. 2A is a side view showing an example of such a liquid crystal display device, and FIG. 2B is a plan view in which a part of the backlight is cut. The backlight 2 arranged on the back side of the liquid crystal display panel 1 is called an edge light type, and a reflection plate 4 is provided on a lower surface of a light guide plate 3 whose upper surface is a light emitting surface, and diffuses on the upper surface of the light guide plate 3. A plate 5 is provided, a prism sheet 6 is provided on an upper surface of the diffusion plate 5, and a fluorescent tube (linear light source) 7 is provided outside a predetermined end surface 3 a of the light guide plate 3.
Is disposed on the outer periphery of the fluorescent tube 7, and a substantially semi-cylindrical reflector 8 is disposed on the outer periphery of the light guide plate 3.
Is attached to both sides of a predetermined end portion of the optical disc.

【0003】そして、図2(B)において二点鎖線で囲
まれた領域は導光板3の発光領域9となっている。蛍光
管7はその両端部に電極を有する構造であるので、電極
の設けられた両端部は非発光領域7aとなっており、そ
の間は発光領域7bとなっている。この場合、蛍光管7
の非発光領域7aと発光領域7bとの境界は、導光板3
の所定の端面3aにおいて発光領域9の両端部に対応す
る位置よりも多少内側に位置させられている。そして、
蛍光管7の発光領域7bから導光板3の所定の端面3a
に向けて照射された光は、図2(B)の実線の矢印で示
すように、導光板3の所定の端面3aに直接照射され
る。また、蛍光管7の発光領域7bから反射板8に向け
て照射された光は、図2(B)の破線の矢印で示すよう
に、反射板8で反射されて導光板3の所定の端面3aに
照射される。この場合、反射板8で乱反射するので、蛍
光管7の非発光領域7aと発光領域7bとの境界を導光
板3の所定の端面3aにおいて発光領域9の両端部に対
応する位置よりも多少内側に位置させても、導光板3の
発光領域9をほぼ均一に発光させることができる。
In FIG. 2B, a region surrounded by a two-dot chain line is a light emitting region 9 of the light guide plate 3. Since the fluorescent tube 7 has a structure having electrodes at both ends, both ends where the electrodes are provided are non-light-emitting regions 7a, and a light-emitting region 7b is located between them. In this case, the fluorescent tube 7
The boundary between the non-light-emitting region 7a and the light-emitting region 7b is
Of the light-emitting region 9 at a predetermined end surface 3a. And
A predetermined end face 3a of the light guide plate 3 from the light emitting area 7b of the fluorescent tube 7
Is irradiated directly on a predetermined end face 3a of the light guide plate 3 as shown by a solid arrow in FIG. Light emitted from the light emitting region 7b of the fluorescent tube 7 toward the reflector 8 is reflected by the reflector 8 as shown by a broken arrow in FIG. 3a. In this case, since the light is irregularly reflected by the reflection plate 8, the boundary between the non-light-emitting region 7 a and the light-emitting region 7 b of the fluorescent tube 7 is slightly inside the position corresponding to both ends of the light-emitting region 9 on the predetermined end surface 3 a of the light guide plate 3. , The light emitting region 9 of the light guide plate 3 can emit light almost uniformly.

【0004】[0004]

【発明が解決しようとする課題】このように、従来のバ
ックライトでは、導光板3の発光領域9をほぼ均一に発
光させるために、蛍光管7の非発光領域7aと発光領域
7bとの境界を導光板3の所定の端面3aにおいて発光
領域9の両端部に対応する位置よりも多少内側に位置さ
せている。換言すれば、蛍光管7の非発光領域7aと発
光領域7bとの境界をこれ以上内側に位置させると、導
光板3の発光領域9の図2(B)における左右方向両側
が暗くなるので好ましくない。この結果、蛍光管7の両
端部を導光板3の両端面から比較的大きく突出させざる
を得ず、バックライト2全体としての蛍光管7の長さに
沿う方向の寸法が大きくなるという問題があった。この
発明の課題は、全体としての線状光源の長さに沿う方向
の寸法を小さくすることである。
As described above, in the conventional backlight, in order to make the light emitting area 9 of the light guide plate 3 emit light almost uniformly, the boundary between the non-light emitting area 7a and the light emitting area 7b of the fluorescent tube 7 is used. Are positioned slightly inside the positions corresponding to both ends of the light emitting region 9 on the predetermined end face 3 a of the light guide plate 3. In other words, it is preferable that the boundary between the non-light-emitting region 7a and the light-emitting region 7b of the fluorescent tube 7 be located further inside because the light-emitting region 9 of the light guide plate 3 becomes dark on both left and right sides in FIG. Absent. As a result, both ends of the fluorescent tube 7 must be relatively protruded from both end surfaces of the light guide plate 3, and the size of the backlight 2 as a whole along the length of the fluorescent tube 7 increases. there were. It is an object of the present invention to reduce the dimension in the direction along the length of a linear light source as a whole.

【0005】[0005]

【課題を解決するための手段】この発明は、上面が発光
面となる導光板と、該導光板の所定の端面の外側に配置
された線状光源と、該線状光源の外周部に配置された反
射板とを備え、前記反射板の両端部を、前記線状光源の
発光領域の両端部からの光を当該両端部よりも外側にお
ける前記導光板の所定の端面に向けて反射する構造とし
たものである。この発明によれば、反射板の両端部を、
線状光源の発光領域の両端部からの光を当該両端部より
も外側における導光板の所定の端面に向けて反射する構
造としているので、線状光源の長さを可及的に小さくし
ても、導光板の発光領域をほぼ均一に発光させることが
でき、したがって全体としての線状光源の長さに沿う方
向の寸法を小さくすることができる。
According to the present invention, there is provided a light guide plate having an upper surface serving as a light emitting surface, a linear light source disposed outside a predetermined end face of the light guide plate, and an outer peripheral portion of the linear light source. And a structure that reflects light from both ends of the light emitting region of the linear light source toward a predetermined end surface of the light guide plate outside the both ends. It is what it was. According to this invention, both ends of the reflector are
Since the light from both ends of the light emitting region of the linear light source is reflected toward the predetermined end surface of the light guide plate outside the both ends, the length of the linear light source is made as small as possible. Also, the light emitting area of the light guide plate can be made to emit light almost uniformly, and therefore, the dimension in the direction along the length of the linear light source as a whole can be reduced.

【0006】[0006]

【発明の実施の形態】図1(A)はこの発明の一実施形
態を適用した液晶表示装置を示す側面図であり、図1
(B)はそのバックライトの一部を切断した平面図であ
る。これらの図において、図2(A)及び(B)と同一
名称部分には同一の符号を付し、その説明を適宜省略す
る。この液晶表示装置では、反射板8の両端部の導光板
3の所定の端面3aと対向する部分は、蛍光管7の発光
領域7b側を蛍光管7の中央部側から端部側に向かうに
従って蛍光管7から漸次離間するように傾斜された傾斜
部8aとされ、蛍光管7の非発光領域7a側を蛍光管7
に対して平行とされた平行部8bとされた構造となって
いる。一方、蛍光管7の長さは従来の場合よりも所定の
長さだけ短くなっている。そして、蛍光管7の非発光領
域7aと発光領域7bとの境界は、導光板3の所定の端
面3aにおいて発光領域9の両端部に対応する位置より
も内側であって、反射板8の傾斜部8aと平行部8bと
の境界よりも多少外側に位置させられている。すなわ
ち、蛍光管7の発光領域7bの両端部は反射板8の両傾
斜部8aとほぼ対向させられている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a side view showing a liquid crystal display device to which one embodiment of the present invention is applied.
(B) is a plan view in which a part of the backlight is cut. In these drawings, the same reference numerals are given to the same components as those in FIGS. 2A and 2B, and the description thereof will be omitted as appropriate. In this liquid crystal display device, the portions of both ends of the reflection plate 8 facing the predetermined end surface 3a of the light guide plate 3 are arranged such that the light emitting region 7b side of the fluorescent tube 7 goes from the central portion of the fluorescent tube 7 to the end portion. The non-light-emitting region 7a of the fluorescent tube 7 is formed as an inclined portion 8a which is inclined so as to be gradually separated from the fluorescent tube 7.
The structure is a parallel portion 8b which is made parallel to. On the other hand, the length of the fluorescent tube 7 is shorter than the conventional case by a predetermined length. The boundary between the non-light-emitting region 7a and the light-emitting region 7b of the fluorescent tube 7 is inside the position corresponding to both ends of the light-emitting region 9 on the predetermined end surface 3a of the light guide plate 3, and the inclination of the reflection plate 8 It is located slightly outside the boundary between the portion 8a and the parallel portion 8b. That is, both ends of the light emitting region 7b of the fluorescent tube 7 are substantially opposed to both inclined portions 8a of the reflection plate 8.

【0007】このように、この液晶表示装置では、反射
板8の両端部を傾斜部8aとし、この両傾斜部8aに蛍
光管7の発光領域7bの両端部をほぼ対向させている。
このため、蛍光管7の発光領域7bの両端部から反射板
8に向けて照射された光は、図1(B)の破線の矢印で
示すように、反射板8の傾斜部8aで反射され、蛍光管
7の発光領域7bの両端部よりも外側における導光板3
の所定の端面3aに照射される。したがって、蛍光管7
の長さを従来の場合よりも所定の長さだけ短くしても、
導光板3の発光領域9をほぼ均一に発光させることがで
きる。この結果、バックライト2全体としての蛍光管7
の長さに沿う方向の寸法を小さくすることができる。
As described above, in this liquid crystal display device, both ends of the reflection plate 8 are inclined portions 8a, and both end portions of the light emitting region 7b of the fluorescent tube 7 are substantially opposed to both inclined portions 8a.
Therefore, light emitted from both ends of the light emitting region 7b of the fluorescent tube 7 toward the reflecting plate 8 is reflected by the inclined portion 8a of the reflecting plate 8 as shown by a broken arrow in FIG. Light guide plate 3 outside both ends of the light emitting region 7b of the fluorescent tube 7
Is irradiated on the predetermined end face 3a. Therefore, the fluorescent tube 7
Even if the length is shorter than the conventional case by a predetermined length,
The light emitting region 9 of the light guide plate 3 can emit light almost uniformly. As a result, the fluorescent tube 7 as the entire backlight 2
Can be reduced in the direction along the length.

【0008】なお、上記実施形態では、反射板8の両端
部の導光板3の所定の端面3aと対向する部分を傾斜部
8aとした場合について説明したが、これに限らず、反
射板8の両端部の導光板3の所定の端面3aと対向する
部分及び反射板8の両端部の下面側と上面側の少なくと
も一方を傾斜部とするようにしてもよい。また、上記実
施形態では、反射板8の形状を大略半円筒状とした場合
について説明したが、これに限らず、例えば半角筒状と
してもよい。
In the above-described embodiment, the case has been described in which the inclined portions 8a are formed at both ends of the reflector 8 and the portions facing the predetermined end surfaces 3a of the light guide plate 3. However, the present invention is not limited to this. At least one of a portion of the light guide plate 3 at both ends facing the predetermined end surface 3a and at least one of the lower surface side and the upper surface side of both ends of the reflection plate 8 may be formed as an inclined portion. Further, in the above-described embodiment, the case where the shape of the reflecting plate 8 is substantially a semi-cylindrical shape has been described. However, the present invention is not limited to this.

【0009】[0009]

【発明の効果】以上説明したように、この発明によれ
ば、反射板の両端部を、線状光源の発光領域の両端部か
らの光を当該両端部よりも外側における導光板の所定の
端面に向けて反射する構造としているので、線状光源の
長さを可及的に小さくしても、導光板の発光領域をほぼ
均一に発光させることができ、したがって全体としての
線状光源の長さに沿う方向の寸法を小さくすることがで
きる。
As described above, according to the present invention, light from both ends of the light-emitting region of the linear light source is provided on the predetermined end surface of the light guide plate outside the both ends. , The light emitting area of the light guide plate can be made to emit light almost uniformly even if the length of the linear light source is made as short as possible. The dimension in the direction along the length can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】(A)はこの発明の一実施形態を適用した液晶
表示装置を示す側面図、(B)はそのバックライトの一
部を切断した平面図。
FIG. 1A is a side view showing a liquid crystal display device to which an embodiment of the present invention is applied, and FIG. 1B is a plan view in which a part of the backlight is cut.

【図2】(A)は従来の液晶表示装置の一例を示す側面
図、(B)はそのバックライトの一部を切断した平面
図。
FIG. 2A is a side view showing an example of a conventional liquid crystal display device, and FIG. 2B is a plan view in which a part of the backlight is cut.

【符号の説明】[Explanation of symbols]

3 導光板 3a 所定の端面 7 蛍光管 7a 非発光領域 7b 発光領域 8 反射板 8a 傾斜部 REFERENCE SIGNS LIST 3 light guide plate 3 a predetermined end face 7 fluorescent tube 7 a non-light-emitting region 7 b light-emitting region 8 reflector 8 a inclined portion

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 上面が発光面となる導光板と、該導光板
の所定の端面の外側に配置された線状光源と、該線状光
源の外周部に配置された反射板とを備え、前記反射板の
両端部を、前記線状光源の発光領域の両端部からの光を
当該両端部よりも外側における前記導光板の所定の端面
に向けて反射する構造としたことを特徴とする表示装置
の光源構造。
A light guide plate having an upper surface serving as a light emitting surface; a linear light source disposed outside a predetermined end surface of the light guide plate; and a reflector disposed on an outer peripheral portion of the linear light source. A display characterized in that both ends of the reflection plate are configured to reflect light from both ends of a light emitting area of the linear light source toward a predetermined end surface of the light guide plate outside the both ends. Light source structure of the device.
【請求項2】 前記反射板の両端部の前記導光板の所定
の端面と対向する部分は、前記線状光源の中央部側から
端部側に向かうに従って前記線状光源から漸次離間する
ように傾斜されていることを特徴とする請求項1記載の
表示装置の光源構造。
2. A portion of each of both ends of the reflection plate, which faces a predetermined end surface of the light guide plate, is gradually separated from the linear light source as it goes from the center to the end of the linear light source. The light source structure of a display device according to claim 1, wherein the light source structure is inclined.
JP7857298A 1998-03-12 1998-03-12 Light source structure of display device Pending JPH11260140A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7857298A JPH11260140A (en) 1998-03-12 1998-03-12 Light source structure of display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7857298A JPH11260140A (en) 1998-03-12 1998-03-12 Light source structure of display device

Publications (1)

Publication Number Publication Date
JPH11260140A true JPH11260140A (en) 1999-09-24

Family

ID=13665625

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7857298A Pending JPH11260140A (en) 1998-03-12 1998-03-12 Light source structure of display device

Country Status (1)

Country Link
JP (1) JPH11260140A (en)

Similar Documents

Publication Publication Date Title
JP4368075B2 (en) Surface lighting device
EP1460336A1 (en) Illumination unit and liquid crystal display device using the unit
TW200411217A (en) Reflector for back light assembly and back light assembly using the same
US7025488B2 (en) Backlight for LCD's
JPH1172625A (en) Back light and liquid crystal display device using it
JP2000222925A (en) Surface lighting system
JP3351251B2 (en) Sidelight type surface light source device
JP2008047291A (en) Planar lighting system
JP4255333B2 (en) Backlight unit and liquid crystal display device
JPH08160425A (en) Back light device
JPH11260140A (en) Light source structure of display device
JP4474606B2 (en) Surface lighting device
JP2002329403A (en) Illumination device for display device and display device provided with the same
JP4438539B2 (en) Display device and planar light source device
JPH08122778A (en) Liquid crystal display device
JPH11176224A (en) Surface light emitting device
JP2001076526A (en) Surface light source device
JP2002093229A (en) Back-light unit and liquid crystal display device
KR100460410B1 (en) Backlighting device for liquid crystal display device
KR100457233B1 (en) Backlight Structure of Liquid Crystal Display
JPH09105935A (en) Liquid crystal display device
JPH1172626A (en) Back light and liquid crystal display device using the same
JPH11344705A (en) Back light system of lcd
JPH08201809A (en) Lighting system
KR100307446B1 (en) Surface light source device