JP2002072901A - Back light device - Google Patents

Back light device

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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
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JP
Japan
Prior art keywords
circuit board
light
point light
liquid crystal
light source
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
Application status is Pending legal-status Critical

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。 The present invention relates to relates to a backlight device arranged plurality of point light sources (light-emitting diode or the like) 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。 BACKGROUND ART Conventionally, there is a liquid crystal display device having a backlight device 2 that illuminates the liquid crystal display device 1 and the liquid crystal display device 1 as shown in FIG. 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。 The liquid crystal display device 1 is formed by bonding a polarizing plate (not shown) on both sides of the liquid crystal cell in which liquid crystal is sealed pair of light transparent substrate 3 transparent electrode film is provided. 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。 The liquid crystal display device 1 a tape carrier package 4 (hereinafter, referred to as TCP) is connected.
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。 The TCP4 the flexible wiring board 5 is obtained by arranging the drive circuit 6 for driving the liquid crystal display device 1. 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。 The TCP4 is connected to the rigid circuit board 7, the microcomputer 8 for controlling the driving circuit 6 is disposed on the rigid 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。 [0003] The liquid crystal display device 1 is a display device in the light-receiving type which can not itself emits the backlight device 2 is provided, by illuminating the liquid crystal display element 1 from the rear by the backlight device 2, good visibility is thus obtained. バックライト装置2は、硬質回路板7 The backlight device 2, the hard circuit board 7
及び発光ダイオード9からなるものである。 And in which a light emitting diode 9. 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、 The backlight device 2, the rigid circuit board 7 through hole 7a is formed,
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。 After inserting the terminal portion 9a of the light-emitting diode 9, it is prepared by connecting a wiring pattern and a terminal portion 9a formed on the rear surface of the rigid circuit board 7 by 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。 [SUMMARY OF THE INVENTION However, the backlight device 2 of the above did not said that necessarily efficiently irradiated to the liquid crystal display device 1 of the light emitting diode 9 is emitted. 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。 That is, the light emitted in the forward direction is to illuminate the liquid crystal display device 1, light emitted in an oblique backward direction, when the circuit board 7, does not contribute to the illumination of the liquid crystal display device 1. 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。 The present invention has been made in view of this problem, by irradiating light source is emitted light to efficiently display device, and provides a high brightness illumination can back light device.

【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 The present invention SUMMARY OF] In order to solve the above problems, a plurality of point light sources 14, the point light source 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, The circuit board 15 but connected, respectively to said point light source 14 is disposed in front of the circuit board 15 corresponding openings 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。 A reflective member 16 and 24 for reflecting the light of the point light source 14 has a 24a, and has a.

【0006】また、本発明は、複数のプリズム部22a Further, the present invention includes a plurality of prism parts 22a
を有するプリズムシート22を前記反射部材26,24 The reflecting member prism sheet 22 having a 26, 24
の前方に配設したものである。 Of in which is disposed forwardly.

【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, the present invention is that the case body 17 for accommodating the circuit board 15 and the reflective member 16 and 24 is provided, the second to reflect light of the point light source 14 to the inner surface of the case body 17 it is provided with a reflecting member 23.

【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。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention. 図1乃至図4は、第一実施形態を示す図である。 1 to 4 are views showing a first embodiment. 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。 11 is a liquid crystal display device, the liquid crystal display device 11 is formed by bonding a polarizing plate (not shown) around both sides of a liquid crystal cell in which liquid crystal is sealed pair of light-transmitting substrate 12. 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。 The liquid crystal display element 11 are those referred to as STN (super twisted nematic) type, the liquid crystal display device 11 is a large number of pixels has a dot matrix type 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 [0009] 13 is a backlight device (light emitting device), the backlight device 13 is a light emitting diode 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。 (Point light sources), and has rigid circuit board 15 and the reflector 16 (reflecting member). 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。 Reflector 16 is obtained by attaching a reflective film on the front surface of the resin substrate. 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。 As shown in FIG. 2, the reflection plate 16, respectively corresponding circular opening 16a is formed on the 11 light emitting diodes 14. 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。 The diameter of the opening portion 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 [0010] 17 is a case body, the case body 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。 The liquid crystal display device 11, the hard circuit board 15 and the reflector 16 is assembled to. 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。 18 is a TCP, the TCP18 is obtained by arranging the drive circuit 20 to the flexible wiring board 19. 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。 One end of the flexible wiring board 19 is connected to the liquid crystal display device 11 by an anisotropic conductive film (not shown), the other end is connected to the rigid circuit board 15. 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。 The rear surface of the rigid circuit board 15, a predetermined wiring pattern is formed, the microcomputer 21 controls the driving circuit 20 is disposed.

【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。 [0011] 22 is a prism sheet, the prism sheet 22 is disposed between the reflector 16 and the liquid crystal display element 11, is assembled to the case body 17. 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。 23 is a reflective film (second reflecting member), the reflective film 23 is adhered to the inner surface of the side wall portion 17a of the case body 17. 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。 Prism sheet 22, for example, 3M's brightness enhancement film (trade name: BEF) is made of. 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 As shown in FIGS. 3 and 4, the prism sheet 22 has a large number of fine prism portion 22a, the prism unit 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。 2a is the side of the liquid crystal display device 11, the rear surface 22b is disposed so that the side of the light emitting diode 14.

【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。 [0012] prism portion 22a is a substantially triangular prism shape, the angle θ of the inclined surface 22c of the prism portion 22a, which is at 45 ° to the normal of the rear surface 22b. なお、プリズム部22aは、拡大して図示しているが、稜線22d Incidentally, the prism portion 22a, are illustrated in an enlarged, ridgeline 22d
の間隔wが約50μmの微小なものである。 Interval w of those minute of about 50μm. 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。 Prism sheet 22 refracts the light L incident from obliquely rear 22b, the light emitting diode 22 that collect in the vertical direction, thereby improving the brightness of the backlight device 13. なお、後面22bに略垂直に入射した光L' The light L 'incident substantially perpendicular to the rear surface 22b
は、斜面22cにより、後方に反射される。 Is the slope 22c, is reflected back.

【0013】本実施形態によれば、発光ダイオード14 According to the present embodiment, the light emitting diode 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。 From the light emitted obliquely rearward, is reflected forward by the reflector 16, the light can also contribute to the illumination of the liquid crystal display device 11, it is possible to high intensity illumination. 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。 Further, the light L reflected rearward by inclined surface 22c of the prism sheet 22 'is also reflected forward again by the reflection plate 16.
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。 Also, light impinging on the side wall 17a of the case body 17, because it is reflected by the reflective film 23, further, the illumination brightness can be improved.

【0014】なお、図5に示す第二実施形態のように、 [0014] As in the second embodiment shown in FIG. 5,
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。 May be a structure for supporting the light emitting diode 14 by the reflection plate 24, it is possible to obtain the same effects as in the first embodiment. 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。 In this case, the diameter of the opening 24a of the reflector 24 is smaller than the diameter of the light emitting diode 24. 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。 The first, but the point light sources of the second embodiment is a light emitting diode 14, for example it may be a valve.

【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、 According to the present invention includes a plurality of point light sources, and a circuit board in which the point light source is connected, each corresponding opening in the point light source disposed in front of said circuit board a reflecting member for reflecting the light of the point light source, are those having,
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。 From the point light source is light irradiated obliquely rearward, to be reflected forward by the reflecting member, it is high intensity illumination.

【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, the present invention is a case body that houses the circuit board and the reflecting member is provided, which has provided a second reflecting member for reflecting the light of the point light source on the inner surface of the case body There, it is possible to more high intensity illumination.

【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。 Sectional view of a backlight apparatus according to the first embodiment of the present invention; FIG.

【図2】 同上実施形態を示す反射部材の正面図。 Figure 2 is a front view of the reflecting member showing the same embodiment.

【図3】 同上実施形態を示すプリズムシートの斜視図。 3 is a perspective view of a prism sheet showing the same 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。 [4] enlarged sectional view of the prism sheet showing the same 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。 Sectional view of a backlight apparatus according to a second embodiment of the present invention; FIG.

【図6】 従来例を示すバックライト装置の断面図。 6 is a cross-sectional view of a backlight device of a conventional example.

【符号の説明】 DESCRIPTION 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 13 backlight device 14 light-emitting diodes (point light sources) 15 circuit board 16 reflector (reflective member) 16a opening 17 case 22 prism sheet 22a prism portion 23 reflective film (second reflecting member) 24 reflection plate (reflection 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 ────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl 7 identification mark FI theme Court Bu (reference) // F21Y 101:. 02 G02F 1/1335 530

Claims (3)

    【特許請求の範囲】 [The 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 plurality of point light sources, and a circuit board in which the point light source is connected, the point light source each have a corresponding opening in the point light source disposed in front of said circuit board backlight apparatus characterized by having a reflecting member for reflecting 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。 A backlight apparatus according to claim 1, a backlight device, wherein a prism sheet was disposed in front of the reflective member having a plurality of prism portions.
  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. A backlight device according to claim 1 or claim 2, the case body for accommodating the circuit board and the reflecting member is provided, the reflection light of the point light source on the inner surface of the case body backlight apparatus characterized in that a second reflecting member for.
JP2000260848A 2000-08-25 2000-08-25 Back light device Pending JP2002072901A (en)

Priority Applications (1)

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