JP2002072901A - Back light device - Google Patents

Back light device

Info

Publication number
JP2002072901A
JP2002072901A JP2000260848A JP2000260848A JP2002072901A JP 2002072901 A JP2002072901 A JP 2002072901A JP 2000260848 A JP2000260848 A JP 2000260848A JP 2000260848 A JP2000260848 A JP 2000260848A JP 2002072901 A JP2002072901 A JP 2002072901A
Authority
JP
Japan
Prior art keywords
light
circuit board
liquid crystal
reflection
backlight
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
JP2000260848A
Other languages
Japanese (ja)
Inventor
Katsue Takato
克衛 高頭
Original Assignee
Nippon Seiki Co Ltd
日本精機株式会社
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 Nippon Seiki Co Ltd, 日本精機株式会社 filed Critical Nippon Seiki Co Ltd
Priority to JP2000260848A priority Critical patent/JP2002072901A/en
Publication of JP2002072901A publication Critical patent/JP2002072901A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a back light device which permits highly brilliant illumination. SOLUTION: Dot-like light sources 14 are connected with a circuit board 15. A reflection member 16 is disposed in front of the circuit board 15, has opening parts 16a which are corresponding to the dot-like light sources 14 and reflects the light of the dot-like light sources 14. A prism sheet 22 has plural prism parts 22a and is disposed in front of the reflection member 26.

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】本発明は、複数の点状光源
(発光ダイオード等)を回路板に配設したバックライト
装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device having a plurality of point light sources (e.g., light emitting diodes) disposed on a circuit board.
【0002】[0002]
【従来の技術】従来より、図6に示すような液晶表示素
子1及びこの液晶表示素子1を照明するバックライト装
置2を有する液晶表示装置がある。液晶表示素子1は透
明電極膜が設けられた一対の透光性基板3に液晶を封入
した液晶セルの両面に偏光板(図示しない)を貼り合わ
せたものである。液晶表示素子1にはテープキャリアパ
ッケージ4(以下、TCPと記す)が接続されている。
このTCP4は可撓性配線板5に液晶表示素子1を駆動
する駆動回路6を配設したものである。TCP4には硬
質回路板7が接続されており、この硬質回路板7には駆
動回路6を制御するマイコン8が配設されている。
2. Description of the Related Art Conventionally, there is a liquid crystal display device having a liquid crystal display device 1 as shown in FIG. 6 and a backlight device 2 for illuminating the liquid crystal display device 1. The liquid crystal display element 1 is a device in which polarizing plates (not shown) are attached to both sides of a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates 3 provided with a transparent electrode film. A tape carrier package 4 (hereinafter referred to as TCP) is connected to the liquid crystal display element 1.
The TCP 4 has a flexible circuit board 5 on which a drive circuit 6 for driving the liquid crystal display element 1 is provided. A hard circuit board 7 is connected to the TCP 4, and a microcomputer 8 for controlling the drive circuit 6 is provided on the hard circuit board 7.
【0003】液晶表示素子1は自らは発光することがで
きない受光型の表示素子であり、バックライト装置2を
設け、このバックライト装置2により液晶表示素子1を
後方から照明することにより、良好な視認性が得られる
ようにしている。バックライト装置2は、硬質回路板7
及び発光ダイオード9からなるものである。バックライ
ト装置2は、貫通孔7aが形成された硬質回路板7に、
発光ダイオード9の端子部9aを挿入した後、硬質回路
板7の後面に形成された配線パターンと端子部9aを半
田Sで接続することにより製造される。
The liquid crystal display element 1 is a light receiving type display element which cannot emit light by itself, and is provided with a backlight device 2, which illuminates the liquid crystal display element 1 from behind by using the backlight device 2, thereby providing a good liquid crystal display device. Visibility is obtained. The backlight device 2 includes a hard circuit board 7
And a light emitting diode 9. The backlight device 2 includes a hard circuit board 7 having a through hole 7a formed therein.
After the terminal 9a of the light-emitting diode 9 is inserted, the wiring pattern formed on the rear surface of the hard circuit board 7 is connected to the terminal 9a with solder S.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、上記の
バックライト装置2は、発光ダイオード9が発した光を
必ずしも効率よく液晶表示素子1に照射させているとは
言えなかった。つまり、前方向に照射された光は、液晶
表示素子1を照明するが、斜め後ろ方向に照射された光
は、回路板7にあたって、液晶表示素子1の照明には寄
与しない。本発明は、この問題に鑑みなされたものであ
り、光源が発した光を効率良く表示素子に照射して、高
輝度な照明が可能なバックライト装置を提供するもので
ある。
However, it cannot be said that the above-mentioned backlight device 2 always irradiates the light emitted from the light emitting diode 9 to the liquid crystal display element 1 efficiently. That is, the light emitted in the forward direction illuminates the liquid crystal display element 1, but the light emitted in the obliquely backward direction hits the circuit board 7 and does not contribute to the illumination of the liquid crystal display element 1. The present invention has been made in view of the above problem, and an object of the present invention is to provide a backlight device that can efficiently irradiate light emitted from a light source to a display element and perform high-luminance illumination.
【0005】[0005]
【課題を解決するための手段】本発明は、前記課題を解
決するため、複数の点状光源14と、前記点状光源14
が接続される回路板15と、前記回路板15の前方に配
設され前記点状光源14に各々対応する開口部16a,
24aを有し前記点状光源14の光を反射させる反射部
材16,24と、を有するものである。
According to the present invention, a plurality of point light sources 14 and a plurality of point light sources 14 are provided.
Are connected to the circuit board 15, and openings 16a, 16b, which are arranged in front of the circuit board 15 and correspond to the point light sources 14, respectively.
And reflecting members 16 and 24 for reflecting the light of the point light source 14.
【0006】また、本発明は、複数のプリズム部22a
を有するプリズムシート22を前記反射部材26,24
の前方に配設したものである。
[0006] The present invention also provides a plurality of prism portions 22a.
The prism sheet 22 having
It is arranged in front of.
【0007】また、本発明は、前記回路板15及び前記
反射部材16,24を収容するケース体17を設け、前
記ケース体17の内側面に前記点状光源14の光を反射
させる第二の反射部材23を設けたものである。
Further, according to the present invention, there is provided a case body 17 for accommodating the circuit board 15 and the reflection members 16 and 24, and the second surface for reflecting the light of the point light source 14 on the inner surface of the case body 17. A reflection member 23 is provided.
【0008】[0008]
【発明の実施の形態】以下、添付の図面に基いて、本発
明の一実施形態を説明する。図1乃至図4は、第一実施
形態を示す図である。11は液晶表示素子であり、この
液晶表示素子11は一対の透光性基板12に液晶を封入
した液晶セルの前後両面に偏光板(図示しない)を貼り
合わせたものである。液晶表示素子11はSTN(超ね
じれネマチック)型と称されるものであり、この液晶表
示素子11は多数の画素がマトリクス状に配列されたド
ットマトリクス式となっている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 4 are diagrams showing a first embodiment. Reference numeral 11 denotes a liquid crystal display element. The liquid crystal display element 11 is a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates 12, and polarizing plates (not shown) are attached to both front and rear surfaces of the liquid crystal cell. The liquid crystal display element 11 is of a so-called STN (super twisted nematic) type, and the liquid crystal display element 11 is a dot matrix type in which many pixels are arranged in a matrix.
【0009】13はバックライト装置(発光装置)であ
り、このバックライト装置13は発光ダイオード14
(点状光源),硬質回路板15及び反射板16(反射部
材)を有している。反射板16は、樹脂基板の前面に反
射膜を貼着したものである。図2に示すように、反射板
16には、11個の発光ダイオード14に夫々対応する
円形の開口部16aが形成されている。開口部16aの
直径は、発光ダイオードの直径よりも若干大きくなって
いる。
Reference numeral 13 denotes a backlight device (light emitting device).
(Point light source), a hard circuit board 15 and a reflection plate 16 (reflection member). The reflection plate 16 has a reflection film adhered to the front surface of a resin substrate. As shown in FIG. 2, the reflector 16 has circular openings 16a corresponding to the eleven light emitting diodes 14, respectively. The diameter of the opening 16a is slightly larger than the diameter of the light emitting diode.
【0010】17はケース体であり、このケース体17
に液晶表示素子11,硬質配線板15及び反射板16が
組付けられる。18はTCPであり、このTCP18は
可撓性配線板19に駆動回路20を配設したものであ
る。可撓性配線板19の一端は異方性導電膜(図示しな
い)により液晶表示素子11に接続されており、他端部
は硬質回路板15と接続されている。硬質回路板15の
後面には、所定の配線パターンが形成されており、駆動
回路20を制御するマイコン21が配設されている。
Reference numeral 17 denotes a case body.
The liquid crystal display element 11, the hard wiring board 15, and the reflection plate 16 are assembled. Reference numeral 18 denotes a TCP in which a driving circuit 20 is provided on a flexible wiring board 19. One end of the flexible wiring board 19 is connected to the liquid crystal display element 11 by an anisotropic conductive film (not shown), and the other end is connected to the hard circuit board 15. A predetermined wiring pattern is formed on the rear surface of the hard circuit board 15, and a microcomputer 21 for controlling the drive circuit 20 is provided.
【0011】22はプリズムシートであり、このプリズ
ムシート22は反射板16と液晶表示素子11の間に配
置され、ケース体17に組付けられている。23は反射
フィルム(第二の反射部材)であり、この反射フィルム
23はケース体17の側壁部17aの内側面に貼着され
ている。プリズムシート22は、例えば3M社の輝度上
昇フィルム(商品名:BEF)からなるものである。図
3及び図4に示すように、プリズムシート22は、多数
の微細なプリズム部22aを有しており、プリズム部2
2aが液晶表示素子11の側に、後面22bが発光ダイ
オード14の側になるように配設されている。
Reference numeral 22 denotes a prism sheet. The prism sheet 22 is disposed between the reflection plate 16 and the liquid crystal display element 11 and is assembled to the case 17. Reference numeral 23 denotes a reflection film (a second reflection member). The reflection film 23 is attached to the inner surface of the side wall 17 a of the case body 17. The prism sheet 22 is made of, for example, a 3M brightness enhancement film (trade name: BEF). As shown in FIGS. 3 and 4, the prism sheet 22 has a large number of fine prism portions 22a,
2a is disposed on the liquid crystal display element 11 side, and the rear surface 22b is disposed on the light emitting diode 14 side.
【0012】プリズム部22aは略三角柱形状となって
おり、プリズム部22aの斜面22cの角度θは、後面
22bの法線に対して45°になっている。なお、プリ
ズム部22aは、拡大して図示しているが、稜線22d
の間隔wが約50μmの微小なものである。プリズムシ
ート22は、後面22bに斜めから入射した光Lを屈折
させて、発光ダイオード22の光を垂直方向に集めるこ
とで、バックライト装置13の明るさを向上させること
ができる。なお、後面22bに略垂直に入射した光L’
は、斜面22cにより、後方に反射される。
The prism portion 22a has a substantially triangular prism shape, and the angle θ of the inclined surface 22c of the prism portion 22a is 45 ° with respect to the normal of the rear surface 22b. Although the prism portion 22a is shown in an enlarged manner, the ridge line 22d is shown.
Are as small as about 50 μm. The prism sheet 22 can improve the brightness of the backlight device 13 by refracting the light L obliquely incident on the rear surface 22b and collecting the light of the light emitting diodes 22 in the vertical direction. The light L ′ that has entered the rear surface 22b substantially perpendicularly.
Is reflected backward by the slope 22c.
【0013】本実施形態によれば、発光ダイオード14
から斜め後方に照射された光が、反射板16によって前
方に反射され、この光も液晶表示素子11の照明に寄与
することができ、高輝度な照明が可能となる。また、プ
リズムシート22の斜面22cにより後方に反射された
光L’も、反射板16によって再び前方に反射される。
また、ケース体17の側壁17aに当たった光も、反射
フィルム23によって反射されるので、更に、照明輝度
が向上する。
According to this embodiment, the light emitting diode 14
The light emitted obliquely rearward from is reflected forward by the reflection plate 16, and this light can also contribute to the illumination of the liquid crystal display element 11, and high-luminance illumination becomes possible. Further, the light L ′ reflected backward by the slope 22 c of the prism sheet 22 is also reflected forward again by the reflector 16.
In addition, since the light hitting the side wall 17a of the case body 17 is also reflected by the reflection film 23, the illumination brightness is further improved.
【0014】なお、図5に示す第二実施形態のように、
反射板24で発光ダイオード14を支持する構造として
も良く、第一実施形態と同様な効果を得ることができ
る。この場合、反射板24の開口部24aの直径は、発
光ダイオード24の直径よりも小さくなる。また、第
一,第二実施形態の点状光源は発光ダイオード14であ
ったが、例えばバルブであっても良い。
Incidentally, as in the second embodiment shown in FIG.
The light emitting diode 14 may be supported by the reflecting plate 24, and the same effect as in the first embodiment can be obtained. In this case, the diameter of the opening 24a of the reflection plate 24 is smaller than the diameter of the light emitting diode 24. In addition, the point light source of the first and second embodiments is the light emitting diode 14, but may be a bulb, for example.
【0015】[0015]
【発明の効果】本発明は、複数の点状光源と、前記点状
光源が接続される回路板と、前記回路板の前方に配設さ
れ前記点状光源に各々対応する開口部を有し前記点状光
源の光を反射させる反射部材と、を有するものであり、
点状光源から斜め後方に照射された光が、反射部材によ
って前方に反射されるため、高輝度な照明ができる。
The present invention has a plurality of point light sources, a circuit board to which the point light sources are connected, and openings disposed in front of the circuit board and corresponding to the point light sources, respectively. A reflecting member for reflecting the light of the point light source,
Since the light emitted obliquely rearward from the point light source is reflected forward by the reflection member, high-luminance illumination can be performed.
【0016】また、本発明は、前記回路板及び前記反射
部材を収容するケース体を設け、前記ケース体の内側面
に前記点状光源の光を反射させる第二の反射部材を設け
たものであり、更に高輝度な照明が可能となる。
Further, according to the present invention, a case body for housing the circuit board and the reflection member is provided, and a second reflection member for reflecting light of the point light source is provided on an inner surface of the case body. In addition, illumination with higher luminance is possible.
【図面の簡単な説明】[Brief description of the drawings]
【図1】 本発明の第一実施形態を示すバックライト装
置の断面図。
FIG. 1 is a sectional view of a backlight device showing a first embodiment of the present invention.
【図2】 同上実施形態を示す反射部材の正面図。FIG. 2 is a front view of a reflection member showing the embodiment.
【図3】 同上実施形態を示すプリズムシートの斜視
図。
FIG. 3 is a perspective view of a prism sheet showing the embodiment.
【図4】 同上実施形態を示すプリズムシートの要部拡
大断面図。
FIG. 4 is an enlarged sectional view of a main part of the prism sheet showing the embodiment.
【図5】 本発明の第二実施形態を示すバックライト装
置の断面図。
FIG. 5 is a sectional view of a backlight device showing a second embodiment of the present invention.
【図6】 従来例を示すバックライト装置の断面図。FIG. 6 is a cross-sectional view of a backlight device showing a conventional example.
【符号の説明】[Explanation of symbols]
13 バックライト装置 14 発光ダイオード(点状光源) 15 回路板 16 反射板(反射部材) 16a 開口部 17 ケース体 22 プリズムシート 22a プリズム部 23 反射フィルム(第二の反射部材) 24 反射板(反射部材) 24a 開口部 Reference Signs List 13 backlight device 14 light emitting diode (point light source) 15 circuit board 16 reflector (reflective member) 16a opening 17 case body 22 prism sheet 22a prism portion 23 reflective film (second reflective member) 24 reflector (reflective member) ) 24a opening
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) // F21Y 101:02 G02F 1/1335 530 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) // F21Y 101: 02 G02F 1/1335 530

Claims (3)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 複数の点状光源と、前記点状光源が接続
    される回路板と、前記回路板の前方に配設され前記点状
    光源に各々対応する開口部を有し前記点状光源の光を反
    射させる反射部材と、を有することを特徴とするバック
    ライト装置。
    1. A point light source comprising: a plurality of point light sources; a circuit board to which the point light sources are connected; and an opening disposed in front of the circuit board and corresponding to each of the point light sources. And a reflecting member for reflecting the light.
  2. 【請求項2】 請求項1に記載のバックライト装置にお
    いて、複数のプリズム部を有するプリズムシートを前記
    反射部材の前方に配設したことを特徴とするバックライ
    ト装置。
    2. The backlight device according to claim 1, wherein a prism sheet having a plurality of prism portions is disposed in front of the reflection member.
  3. 【請求項3】 請求項1または請求項2に記載のバック
    ライト装置において、前記回路板及び前記反射部材を収
    容するケース体を設け、前記ケース体の内側面に前記点
    状光源の光を反射させる第二の反射部材を設けたことを
    特徴とするバックライト装置。
    3. The backlight device according to claim 1, further comprising a case body for housing the circuit board and the reflection member, and reflecting the light of the point light source on an inner surface of the case body. A backlight device, comprising: a second reflecting member for causing the backlight device to emit light.
JP2000260848A 2000-08-25 2000-08-25 Back light device Pending JP2002072901A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000260848A JP2002072901A (en) 2000-08-25 2000-08-25 Back light device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000260848A JP2002072901A (en) 2000-08-25 2000-08-25 Back light device

Publications (1)

Publication Number Publication Date
JP2002072901A true JP2002072901A (en) 2002-03-12

Family

ID=18748791

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2002072901A (en)

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JP2007294317A (en) * 2006-04-26 2007-11-08 Canon Inc Light source device, and image display device
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JP2009094086A (en) * 2003-03-31 2009-04-30 Sharp Corp Surface lighting device and liquid crystal display using it
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US7658504B2 (en) 2005-09-16 2010-02-09 Sharp Kabushiki Kaisha Backlight device and display device comprising backlight device
JP2010161026A (en) * 2009-01-09 2010-07-22 Toshiba Lighting & Technology Corp Illumination device
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