JPH05107542A - Backlight unit for display device - Google Patents

Backlight unit for display device

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Publication number
JPH05107542A
JPH05107542A JP26985591A JP26985591A JPH05107542A JP H05107542 A JPH05107542 A JP H05107542A JP 26985591 A JP26985591 A JP 26985591A JP 26985591 A JP26985591 A JP 26985591A JP H05107542 A JPH05107542 A JP H05107542A
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Prior art keywords
light
plate
surface
part
backlight
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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.)
Withdrawn
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JP26985591A
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Japanese (ja)
Inventor
茂雄 ▲高▼妻
Shigeo Takatsuma
Original Assignee
Fujitsu Ltd
富士通株式会社
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Abstract

PURPOSE: To provide a backlight unit whose entire surface is uniformly bright.
CONSTITUTION: In a display device obtained by mounting a display board part on a backlight consisting of light sources 15 mounted on the inner sides of both side walls of a case 11 whose upper part is opened, a plate-like light transmission plate 20 which is mounted between the light sources 15 in a state where its back surface tightly contacts to the base of the case 11, and on which the emitted light from the light source 15 is made incident from right and left side surfaces 21, and a diffusion plate 14 mounted to tightly contact to the surface of the light transmission plate 20; inverted V-shaped recessed part 25 is provided in the center part of the back surface of the light transmission plate 20 and rugged pattern 20a is formed all over the back surface of the plate 20.
COPYRIGHT: (C)1993,JPO&Japio

Description

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

【0001】 [0001]

【産業上の利用分野】本発明は、液晶表示板等の裏面に設けるバックライトユニットに関するものである。 The present invention relates to relates to a backlight unit provided on the rear surface of the liquid crystal display panel or the like.

【0002】近年の通信端末機には、図3に図示したように筐体2の表面に操作盤部を設けるとともに、操作盤部の上方に通話先の電話番号の表示、或いは送信者のメッセージ等を表示する表示装置1を設けたものがある。 [0002] The recent communication terminal, provided with a control panel portion on the surface of the housing 2 as shown in FIG. 3, the operation panel portion of the upper to the call destination display a telephone number, or the message sender there is provided a display device 1 for displaying the like.

【0003】上述のような表示装置は、図4に図示したように筐体2の表面に液晶表示板3を組み込み、さらに、液晶表示板3の裏面側にバックライトユニット5を装着し液晶表示板3の裏面側を明るくして、夜間等でも表示される文字等を明瞭に読み取れるようにしている。 [0003] the above display device, such as incorporating the liquid crystal display panel 3 on the surface of the housing 2 as shown in FIG. 4, further, a liquid crystal display equipped with a backlight unit 5 on the rear side of the liquid crystal display panel 3 brighten the back surface side of the plate 3, and to read clearly the character or the like displayed at night or the like.

【0004】 [0004]

【従来の技術】図5は従来のバックライトユニットの図で、(A) は斜視図、(B) は断面図 であり、図6は従来例の要所断面図である。 BACKGROUND ART FIG. 5 is a view of a conventional backlight unit, (A) is a perspective view, (B) is a sectional view, FIG. 6 is a key point cross-sectional view of a conventional example.

【0005】図5,図6においてバックライトユニット5は、白色の合成樹脂等よりなる上方が開口したチャンネル形のケース11と、ケース11の両側壁の内側に搭載した光源(例えばLED)15と、裏面がケース底板12に密接するように、光源15間に装着した平板状の導光板13 [0005] Figure 5, the backlight unit 5 in FIG. 6, the case 11 of the channel-shaped upper made of white synthetic resin or the like is opened, a light source (e.g., LED) 15 mounted on the inside of each side wall of the case 11 as the back surface are in close contact to the case bottom plate 12, plate-shaped light guide plate mounted between the light source 15 13
と、導光板13の表面に密接して装着した白色フィルムよりなる拡散板14とで構成されている。 If, in close contact with the surface of the light guide plate 13 is constituted by a diffusion plate 14 made of white film mounted. なお、導光板13 Incidentally, the light guide plate 13
は、透明なアクリル樹脂等よりなる平板状である。 Is a flat plate shape made of a transparent acrylic resin or the like.

【0006】上述のように構成されたバックライトユニット5は、それぞれの光源15から円錐体状に拡開して出射した光は、左右の側面から導光板13に入射する。 [0006] backlight unit 5 configured as described above, light emitted by diverging from each light source 15 to the cone shape is incident from the left and right side surfaces in the light guide plate 13. そして、導光板13の側面の上半分に入射した光は、側面で屈折して導光板13内を直進し拡散板14に入射し、拡散板14 The light incident on the upper half of the side surface of the light guide plate 13 is incident on the diffusion plate 14 straight refraction to the light guide plate 13 on the side, the diffusion plate 14
内で拡散して拡散板14を明るくする。 Brightening the diffuser 14 diffuses within.

【0007】一方、導光板13の側面の下半分に入射した光は、側面で屈折して導光板13内を直進し、一部は導光板13の裏面で斜め上方に拡開するように反射する。 On the other hand, light incident on the lower half of the side surface of the light guide plate 13 is refracted straight through the light guide plate 13 on the side, the reflection as part widens obliquely upward at the rear surface of the light guide plate 13 to. また他の一部は導光板13の裏面を通過しケース底板12の内面で反射して、導光板13に再び入射し、斜め上方に拡開するように導光板13を直進して、拡散板14に入射し拡散して拡散板14を明るくする。 Also some other is reflected by the inner surface of the case bottom plate 12 passes through the rear surface of the light guide plate 13, again enters the light guide plate 13, straight through the light guide plate 13 so as to be widened obliquely upward, diffuser incident on 14 diffuses to brighten the diffusion plate 14.

【0008】 [0008]

【発明が解決しようとする課題】ところで図6に図示したように導光板13に入射した光の大半は、導光板側面近傍の表面又は裏面近傍を投射される。 Most of the incident on the light guide plate 13 as shown in the way Fig. 6 [0008] Light is projected surface or the back surface near the light guide plate side surface near. そして、一部の光が導光板13の表面又は裏面の中央部近傍に投射される。 Then, part of the light is projected in the vicinity of the center of the front or rear surface of the light guide plate 13.

【0009】したがって、従来のバックライトユニットは、光源近傍が明るく、表面の3分の2以上の範囲の中央部が暗くなり、液晶表示板の中央部に表示される文字等が不鮮明になるという問題点があった。 Accordingly, the conventional backlight unit, the light source near the bright, central portion of the at least two range-thirds of the surface becomes dark, that character or the like displayed in the center of the liquid crystal display panel becomes unclear there is a problem.

【0010】本発明はこのような点に鑑みて創作されたもので、表面の全面が一様に明るいバックライトユニットを提供することを目的としている。 [0010] The present invention has been made in view of the above problems, and its object is the entire surface to provide a uniformly bright backlight unit.

【0011】 [0011]

【課題を解決するための手段】上記の目的を達成するために本発明は図1に例示したように、上方が開口したケース11の両側壁の内側に搭載した光源15と、裏面がケース11の底面に密接した状態で光源15間に装着され、光源 The present invention in order to achieve the above object In order to achieve the above as illustrated in FIG. 1, a light source 15 upward is mounted on the inside of each side wall of the case 11 having an opening, the back surface case 11 It is mounted between the light source 15 in a state of close contact with the the bottom surface, the light source
15の出射光が左右の側面21から入射する平板状の導光板 Tabular light guide plate 15 emits light is incident from the left and right side surfaces 21
20と、導光板20の表面に密接して装着する拡散板14とよりなるバックライト上に、表示板部を実装した表示装置において、導光板20の裏面の中央部に逆V形凹部25を設けるとともに、導光板20の裏面の全面に凹凸模様20a を設けた構造とする。 20, close to over more consisting backlight and the diffusion plate 14 to be attached to the surface of the light guide plate 20, in a display device mounted with a display panel unit, the inverted V-shaped recess 25 in the central portion of the rear surface of the light guide plate 20 provided with, and the entire back surface to provided an uneven pattern 20a structure of the light guide plate 20.

【0012】或いは図2に例示したように、導光板20の裏面の中央部に逆V形凹部25を設けるとともに、導光板 [0012] Alternatively, as illustrated in FIG. 2, an inverted V-shaped recess 25 is provided on the central portion of the rear surface of the light guide plate 20, the light guide plate
20の裏面の全面に凹凸模様20a を設け、逆V形凹部25をケース底板12の中央部に設けた逆V形凸部125 に、密接に嵌合させた構造とする。 The entire back surface 20 is provided an uneven pattern 20a, an inverted V Katachitotsu portion 125 provided with the inverted V-shaped recess 25 in the central portion of the case bottom plate 12, and closely fitted allowed structure.

【0013】 [0013]

【作用】本発明によれば、導光板の裏面に凹凸模様を設け、さらに導光板に逆V形凹部を設けたことにより、導光板の中心面近くを進行した光の大部分が、導光板の中央部の逆V形の斜面で反射する。 According to the present invention, the uneven pattern is provided on the rear surface of the light guide plate, further by providing an inverted V-shaped recess in the light guide plate, most of the light that has traveled a center plane near the light guide plate, light guide plate reflected in a reverse V-shaped inclined surface of the central portion of. したがって、導光板を左右方向に通過する照明効果のない無駄な光が殆ど無くなり、拡散板14の中央部が光源近傍とほぼ同様に一様に明るくなる。 Therefore, there is no wasted light without lighting effects to pass through the light guide plate in the lateral direction is almost the central portion of the diffusion plate 14 is substantially the same becomes uniformly bright light source near.

【0014】また、逆V形凹部に密接する逆V形凸部をケース底板に設けている。 Further, there is provided a reverse V Katachitotsu portion closely reversed V-shaped recess in the case bottom plate. よって、逆V形凹部の斜面で反射することなくその斜面を透過した光は、ケース底板の逆V形凸部の斜面で反射して、再び導光板に入射する。 Therefore, light transmitted through the inclined surface without being reflected by the inclined surface of the inverted V-shaped recess is reflected at the slope of the inverted V Katachitotsu portion of the case bottom plate, reenters the light guide plate. したがって照明効率がさらに向上する。 Thus the illumination efficiency can be further improved.

【0015】 [0015]

【実施例】以下図を参照しながら、本発明を具体的に説明する。 EXAMPLES With reference to the following drawings, detailed explanation of the present invention. なお、全図を通じて同一符号は同一対象物を示す。 Note that the same reference numerals throughout the figures denote the same object. 図1は本発明の実施例の図で、(A) は全断面図、 Figure 1 is a diagram of an embodiment of the present invention, (A) the total cross-sectional view,
(B)は要所断面図、図2は本発明の他の実施例の要所断面図である。 (B) is the key point sectional view, FIG. 2 is a key point sectional view of another embodiment of the present invention.

【0016】図1において、バックライトユニット10 [0016] In FIG. 1, the backlight unit 10
は、白色の合成樹脂(例えばABS)よりなる上方が開口したチャンネル形のケース11と、ケース11の両側壁の内側に搭載した光源(例えばLED)15と、裏面がケース底板12に密接するように、光源15間に装着した平板状の導光板20と、導光板20の表面に密接して装着した白色フィルムよりなる拡散板14とで構成されている。 Includes a white synthetic resin (e.g., ABS) channel-shaped case 11 upward opened consisting of a light source (e.g., LED) 15 mounted on the inner side of both side walls of the case 11, so that the back surface is in close contact with the case bottom plate 12 in a flat plate-shaped light guide plate 20 which is mounted between the light source 15, in close contact with the surface of the light guide plate 20 is constituted by a diffusion plate 14 made of white film mounted.

【0017】導光板20は、透明なアクリル樹脂等よりなる平板状で、導光板20の裏面の中央部に側面視が鈍角の逆V形凹部25を設けている。 The light guide plate 20 is a flat plate made of a transparent acrylic resin or the like, viewed from the side in the central portion of the rear surface of the light guide plate 20 is provided with obtuse inverted V-shaped recess 25. この逆V形凹部25の深さは、導光板20の厚さの約4分の3である。 The depth of the inverted V-shaped recess 25 is approximately three-quarters of the thickness of the light guide plate 20.

【0018】また、導光板20の裏面の全面に細かい凹凸模様20aを設けている。 Further, there is provided a fine uneven pattern 20a on the entire back surface of the light guide plate 20. したがって、上述のように構成されたバックライトユニット10は、図1の(B)に図示したように、それぞれの光源15から円錐体状に拡開して出射された光のうち、側面21の上半分に入射した光のほぼ半分は、導光板20の表面側の中央部近傍に到達して拡散板14に入射し、拡散板14内で拡散して拡散板14を明るくする。 Accordingly, the backlight unit 10 configured as described above, as shown in FIG. 1 (B), out of the light emitted by diverging from each light source 15 to the cone shape, the side surface 21 approximately half of the light incident on the top half, to reach near the central portion of the surface side of the light guide plate 20 enters the diffusion plate 14, to brighten the diffuser 14 and diffused in the diffuser 14.

【0019】また、導光板20の側面21の下半分に入射した光のほぼ半分は、光源15近傍の導光板20の裏面に投射され、凹凸模様20a により斜め上方に拡散するよう反射したり、或いはケース底板12の面で斜め上方に反射して、拡散板14の左右の両端近傍を明るくする。 Further, almost half of the light incident on the lower half of the side surface 21 of the light guide plate 20 is projected on the back surface of the light source 15 near the light guide plate 20, or reflected to diffuse diagonally upward by uneven pattern 20a, or it is reflected obliquely upwardly at the surface of the case bottom plate 12, to brighten the vicinity of both ends of the left and right of the diffusion plate 14.

【0020】一方、側面21の中央部近傍に入射した光の大部分は、逆V形凹部25の斜面に投射され、凹凸模様20 Meanwhile, most of the light incident on the near center portion of the side surface 21 is projected on the slopes of the inverted V-shaped recess 25, uneven pattern 20
a により斜め上方に拡散するように反射して、拡散板14 It reflected to diffuse diagonally upward by a, the diffusion plate 14
の中央部に入射して拡散板14の中央部を明るくする。 It enters the central portion to brighten the central portion of the diffusion plate 14 of.

【0021】即ち、従来のものに比較してバックライトユニットの全表面がほぼ一様に明るくなる。 [0021] That is, the entire surface of the backlight unit as compared with the conventional is substantially uniform bright. 図2において、ケース底板12には、導光板20の逆V形凹部25にしっくりと嵌合する逆V形凸部125 を設けている。 In Figure 2, the case bottom plate 12, and the inverted V Katachitotsu portion 125 which fits snugly disposed in inverted V-shaped recess 25 of the light guide plate 20.

【0022】したがって、逆V形凹部25の斜面で反射することなくその斜面を透過した光は、逆V形凸部125 の斜面で反射して、再び導光板20に入射する。 [0022] Thus, light transmitted through the inclined surface without being reflected by the inclined surface of the inverted V-shaped recess 25 is reflected at the slope of the inverted V Katachitotsu unit 125, enters the light guide plate 20 again. したがって図1に図示したものよりも照明効率がさらに向上する。 Therefore lighting efficiency than that shown in FIG. 1 is further improved.

【0023】 [0023]

【発明の効果】以上説明したように本発明は、液晶表示板等の裏面側に装着するバックライトユニットにおいて、導光板の裏面に凹凸模様を設け、さらに逆V形凹部を設けたことにより、より多くの光が拡散板の中央部近傍に到達し、バックライトユニットの全表面がほぼ一様に明るくなり、液晶表示板に表示される文字が鮮明になるという、実用上で優れた効果を有する。 The present invention described above, according to the present invention, in the backlight unit to be mounted on the back side of the liquid crystal display panel or the like, the uneven pattern is provided on the rear surface of the light guide plate, by further providing the inverted V-shaped recess, more light reaches the vicinity of the central portion of the diffusion plate, the entire surface of the backlight unit becomes brighter substantially uniform, that characters displayed on the liquid crystal display panel becomes clear, excellent effects in practical a.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】 本発明の実施例の図で、 (A) は全断面図 (B) は要所断面図 In view of the embodiment of the invention, FIG, (A) the total cross-sectional view (B) is the key point sectional view

【図2】 本発明の他の実施例の要所断面図 Key points sectional view of another embodiment of the present invention; FIG

【図3】 通信端末機の斜視図 3 is a perspective view of a communication terminal

【図4】 表示装置の断面図 Sectional view of Figure 4 the display device

【図5】 従来例の図で、 (A) は斜視図 (B) は断面図 [5] In view of the prior art, (A) is a perspective view (B) is a sectional view

【図6 】 従来例の要所断面図 [6] strategic points sectional view of a conventional example

【符号の説明】 DESCRIPTION OF SYMBOLS

1 表示装置、 2 筐体、3 1 display, 2 housing, 3
液晶表示板、 5,10 バックライトユニット、11 The panel, 5,10 backlight unit, 11
ケース、 12 ケース底板、13,20 導光板、 Case, 12 case bottom plate, 13 and 20 the light guide plate,
14 拡散板、15 光源、 14 diffuser 15 light source,
20a 凹凸模様、21 側面、 20a uneven pattern, 21 side,
25 逆V形凹部、125 逆V形凸部、 25 inverted V-shaped recess, 125 inverted V Katachitotsu unit,

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 上方が開口したケース(11)の両側壁の内側に搭載する光源(15)と、裏面が該ケース(11)の底面に密接した状態で該光源(15)間に装着され、該光源(15)の出射光が左右の側面(21)から入射する平板状の導光板(2 1. A light source (15) of the upper is mounted on the inner side of both side walls of the opened casing (11), the rear surface is mounted between the light source (15) in a state of close contact with the bottom surface of the case (11) , the light source (15) plate-like light guide plate emitting light enters from the right and left sides (21) of (2
    0)と、該導光板(20)の表面に密接して装着する拡散板(1 0) and, the light guide plate (20) diffuser closely attached to the surface of the (1
    4)とよりなるバックライト上に、表示板部を実装した表示装置において、 該導光板(20)の裏面の中央部に逆V形凹部(25)を設けるとともに、該導光板(20)の裏面の全面に凹凸模様(20a) Become more backlight on and 4), in the display device mounted with a display panel unit, the light guide plate (20) back side provided with an inverted V-shaped recess (25) in a central portion of, the light guide plate (20) the entire back surface to the uneven pattern (20a)
    を設けたことを特徴とする表示装置のバックライトユニット。 The backlight unit of the display device, wherein a provided.
  2. 【請求項2】 請求項1記載の表示装置において、 該導光板(20)の裏面の中央部に逆V形凹部(25)を設けるとともに、該導光板(20)の裏面の全面に凹凸模様(20a) 2. A display device according to claim 1, wherein the light guide plate (20) back side provided with an inverted V-shaped recess (25) in the central portion of the back surface of the entire surface uneven pattern of the light guide plate (20) (20a)
    を設け、 該逆V形凹部(25)をケース底板(12)の中央部に設けた逆V形凸部(125) に、密接に嵌合させたことを特徴とする表示装置のバックライトユニット。 The provided, an inverted V Katachitotsu portion provided in a central portion of the case bottom plate inverse V-shaped recess (25) (12) (125), a backlight unit of a display device, characterized in that was closely fitted .
JP26985591A 1991-10-18 1991-10-18 Backlight unit for display device Withdrawn JPH05107542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26985591A JPH05107542A (en) 1991-10-18 1991-10-18 Backlight unit for display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26985591A JPH05107542A (en) 1991-10-18 1991-10-18 Backlight unit for display device

Publications (1)

Publication Number Publication Date
JPH05107542A true true JPH05107542A (en) 1993-04-30

Family

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Family Applications (1)

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JP26985591A Withdrawn JPH05107542A (en) 1991-10-18 1991-10-18 Backlight unit for display device

Country Status (1)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5461547A (en) * 1993-07-20 1995-10-24 Precision Lamp, Inc. Flat panel display lighting system
US5485354A (en) * 1993-09-09 1996-01-16 Precision Lamp, Inc. Flat panel display lighting system
US5673128A (en) * 1995-01-31 1997-09-30 Sharp Kabushiki Kaisha Back light device of liquid crystal device
WO1998019105A1 (en) * 1996-10-25 1998-05-07 Omron Corporation Surface light source and liquid crystal display, portable telephone and information terminal employing the surface light source
KR20110081671A (en) * 2010-01-08 2011-07-14 삼성전자주식회사 Backlight unit and liquid crystal display having the same
WO2013002174A1 (en) * 2011-06-28 2013-01-03 シャープ株式会社 Illuminating device, display device and television receiver
KR101318437B1 (en) * 2006-10-31 2013-10-16 엘지디스플레이 주식회사 Back light unit for liquid crystal display
US9964687B2 (en) 2016-02-17 2018-05-08 Panasonic Intellectual Property Management Co., Ltd. Luminaire

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5461547A (en) * 1993-07-20 1995-10-24 Precision Lamp, Inc. Flat panel display lighting system
US5485354A (en) * 1993-09-09 1996-01-16 Precision Lamp, Inc. Flat panel display lighting system
US5673128A (en) * 1995-01-31 1997-09-30 Sharp Kabushiki Kaisha Back light device of liquid crystal device
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