JP2007018824A - Planar light source - Google Patents

Planar light source Download PDF

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JP2007018824A
JP2007018824A JP2005198008A JP2005198008A JP2007018824A JP 2007018824 A JP2007018824 A JP 2007018824A JP 2005198008 A JP2005198008 A JP 2005198008A JP 2005198008 A JP2005198008 A JP 2005198008A JP 2007018824 A JP2007018824 A JP 2007018824A
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light source
light
tubular
guide plate
liquid crystal
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JP2005198008A
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Japanese (ja)
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Masao Nakano
正雄 中野
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Japan Display Central Inc
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Toshiba Matsushita Display Technology Co Ltd
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Priority to JP2005198008A priority Critical patent/JP2007018824A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a planar light source for a narrower frame, with no illuminance variation such as a dim part around the corner of a liquid crystal display area. <P>SOLUTION: In a planar light source 10, the light incident from a side surface 12i of a lightguide plate 12 is emitted as illumination light form the main surface 12a of the lightguide plate 12 for planar emission. It comprises a tubular light source 14 arranged along the side surface 12i of the lightguide plate 12, and a lamp holder 22 which supports both ends of the tubular light source 14. The lamp holder comprises, on the lihgtguide plate 12 side, a tapered surface 22a that tilts to be gradually thinner in wall toward the inside of the tubular light source 12, with at least the tapered surface 22a applied with specular finish. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、液晶表示装置のバックライトユニットなどに用いられる面光源装置に関するものである。   The present invention relates to a surface light source device used for a backlight unit of a liquid crystal display device.

液晶表示装置には、液晶パネルの背面を照明するバックライトユニットとしては、装置の薄型化を重視してサイドライト型のものが多くなっている。サイドライト型バックライトユニットは、典型的には、ランプホルダに支持された冷陰極管などの管状光源が導光板の所定側面である光入射面に対向配置され、管状光源からの光がその光入射面から導光板に入射する構成となっている。そして、光入射面から入射した光は照明光として導光板の主面である上面（前面）から出射して液晶パネルの背面に照射される。このようにしてバックライトユニットは、液晶パネルを背面から照明する面光源装置として機能する。   As the backlight unit for illuminating the back surface of the liquid crystal panel, many side-light type liquid crystal display devices are emphasized with an emphasis on thinning the device. In a sidelight type backlight unit, typically, a tubular light source such as a cold cathode tube supported by a lamp holder is disposed to face a light incident surface which is a predetermined side surface of a light guide plate, and light from the tubular light source is emitted from the light source. The light is incident on the light guide plate from the incident surface. The light incident from the light incident surface is emitted from the upper surface (front surface), which is the main surface of the light guide plate, as illumination light and is irradiated on the back surface of the liquid crystal panel. Thus, the backlight unit functions as a surface light source device that illuminates the liquid crystal panel from the back.

近年、液晶表示装置においては、表示表示エリアを広く確保しつつ装置を小型化するために、液晶表示エリアの外周部分（いわゆる額縁部分）の幅を狭くするという狭額縁化がなされていることに伴い、液晶表示エリアの内側に存在する管状光源の非有効発光エリアが増大している。この非有効発光エリアは、ランプホルダによる光の遮断や管状光源の非発光部分である電極部により生じるものであり、液晶表示エリアの角部周辺に暗部を発生させる原因となる。そのため、更なる液晶表示装置の狭額縁化は輝度ムラの発生を招くこととなり実現することが困難である問題がある。   In recent years, in the liquid crystal display device, in order to reduce the size of the device while ensuring a wide display display area, the width of the outer peripheral portion (so-called frame portion) of the liquid crystal display area has been narrowed. Along with this, the ineffective light emitting area of the tubular light source existing inside the liquid crystal display area is increasing. This ineffective light-emitting area is generated by the light blocking by the lamp holder and the electrode part which is a non-light-emitting part of the tubular light source, and causes a dark part around the corner of the liquid crystal display area. Therefore, there is a problem that further narrowing of the frame of the liquid crystal display device causes luminance unevenness and is difficult to realize.

このような問題を解決する１つの方策として、ランプホルダを透明部材で構成することで、ランプホルダによる管状光源からの光の遮断により生じる輝度ムラを防止するものが提案されている（例えば、特許文献１参照）
しかしながら、上記特許文献１は、管状光源の中間部を支持するホルダに関するものであって、管状光源の両端部の非有効発光エリア（電極部）に起因する輝度ムラについては考慮されておらず、上記のような狭額縁化に伴う表示画面の角部周辺の輝度ムラを防止することができるものでない。
特開２００１−２１０１２６号公報 As one measure for solving such a problem, there has been proposed one in which the lamp holder is made of a transparent member to prevent luminance unevenness caused by blocking light from the tubular light source by the lamp holder (for example, a patent). Reference 1)
However, Patent Document 1 relates to a holder that supports an intermediate portion of a tubular light source, and does not consider luminance unevenness caused by ineffective light emitting areas (electrode portions) at both ends of the tubular light source. It is not possible to prevent luminance unevenness around the corner of the display screen due to the narrowing of the frame as described above.
JP 2001-210126 A

本発明は上記問題に鑑みてなされたものであり、液晶表示エリアの角部周辺が暗くなるといった輝度ムラを発生させることなく狭額縁化を図ることができる面光源装置を提供することを目的とする。   The present invention has been made in view of the above problems, and an object thereof is to provide a surface light source device capable of narrowing the frame without causing luminance unevenness such as darkening of the periphery of a corner of a liquid crystal display area. To do.

本発明の面光源装置は、導光板の側面から入射される光を前記導光板の主面から照明光として出射して面発光させる面光源装置において、前記導光板の側面に沿って配設された管状光源と、前記管状光源の両端部を支持するランプホルダと、を有し、前記ランプホルダは、前記管状光源内側に向かって漸次に肉薄となるように傾斜するテーパ面を前記導光板側に有し、少なくとも前記テーパ面に鏡面処理がなされていることを特徴とする。   The surface light source device of the present invention is a surface light source device that emits light incident from the side surface of the light guide plate as illumination light from the main surface of the light guide plate, and is disposed along the side surface of the light guide plate. A tubular light source, and a lamp holder that supports both ends of the tubular light source, and the lamp holder has a tapered surface inclined so as to gradually become thinner toward the inside of the tubular light source. And at least the tapered surface is mirror-finished.

以上のように、本発明によれば、ランプホルダによる光の遮断や管状光源の非発光部分である電極部により生じる非有効発光エリアが液晶表示装置の表示エリアの内側に存在する場合であっても、管状光源からの光が鏡面処理を施したテーパ面によって反射されて液晶表示エリアの角部周辺を照射することができる。そのため、液晶表示エリアの角部周辺が暗くなるといった輝度ムラを発生させることなく狭額縁化を図ることができる。   As described above, according to the present invention, there is a case where an ineffective light-emitting area generated by an electrode part that is a light-blocking part of a lamp holder or a non-light-emitting part of a tubular light source exists inside the display area of a liquid crystal display device In addition, the light from the tubular light source is reflected by the tapered surface subjected to the mirror surface treatment, and can irradiate around the corner of the liquid crystal display area. Therefore, it is possible to reduce the frame without causing luminance unevenness such as darkening around the corner of the liquid crystal display area.

以下、本発明の一実施形態について図面を参照して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

面光源装置１０は、図２に示すように、液晶表示装置１００のバックライトユニットとして使用されるものであって、矩形額縁状のフレーム８０が取り付けられた液晶パネル８２の裏面側に配置され、液晶パネル８２の表示画面エリア９０へ面状の光を入射するようになっている。   As shown in FIG. 2, the surface light source device 10 is used as a backlight unit of the liquid crystal display device 100, and is disposed on the back side of a liquid crystal panel 82 to which a rectangular frame 80 is attached, Planar light is incident on the display screen area 90 of the liquid crystal panel 82.

この面光源装置１０は、液晶パネル８２の裏面と対向配置された導光板１２と、導光板１２の一側面である光入射面１２ｉの近傍に配置された管状光源１４とを備えている。   The surface light source device 10 includes a light guide plate 12 disposed to face the back surface of the liquid crystal panel 82, and a tubular light source 14 disposed in the vicinity of a light incident surface 12 i that is one side surface of the light guide plate 12.

導光板１２は、光透過性を有する樹脂などにより板状に成形されており、管状光源１４からの光を、液晶パネル８２と対向する導光板１２の主面１２ａへ導く。この導光板１２
の主面１２ａには光学シート材１６が配設されており、また、主面１２ａに対向する面には反射シート１８が配設されている。 The light guide plate 12 is formed into a plate shape with a light-transmitting resin or the like, and guides light from the tubular light source 14 to the main surface 12 a of the light guide plate 12 facing the liquid crystal panel 82. This light guide plate 12
An optical sheet material 16 is disposed on the main surface 12a, and a reflective sheet 18 is disposed on the surface facing the main surface 12a.

管状光源１４は、直管状の冷陰極管からなり、導光板１２の光入射面１２ｉと対向するようにフレーム８０の一辺部の裏面側に配設されている。管状光源１４は、その外周面のうち導光板１２の光入射面１２ｉを臨む部分以外の部分が開口する略コ字状のランプリフレクタ２０にて覆われており、管状光源１４より発する光をランプリフレクタ２２の内側面で反射させて効率よく光入射面１２ｉより導光板１２内に入射させるようになっている。   The tubular light source 14 is composed of a straight tubular cold cathode tube, and is disposed on the back side of one side of the frame 80 so as to face the light incident surface 12 i of the light guide plate 12. The tubular light source 14 is covered with a substantially U-shaped lamp reflector 20 having an outer peripheral surface other than the portion facing the light incident surface 12 i of the light guide plate 12, and the light emitted from the tubular light source 14 is emitted from the lamp. The light is reflected from the inner side surface of the reflector 22 and efficiently enters the light guide plate 12 from the light incident surface 12i.

図１に示すように、管状光源１４の両端部における電極部１４ａには、ゴムあるいは樹脂などにより成形されたランプホルダ２２が嵌入されており、管状光源１４の両端部を保持するとともに、管状光源１４の電極部１４ａとこれに接続されるケーブルとの接続部を保護するようになっている。   As shown in FIG. 1, lamp holders 22 formed of rubber or resin or the like are fitted into the electrode portions 14a at both ends of the tubular light source 14, and hold both ends of the tubular light source 14, and the tubular light source The connection part of the 14 electrode parts 14a and the cable connected to this is protected.

ランプホルダ２２は、管状光源１４が嵌入される嵌入穴を有する筒状の部材であって、その開口端に行くに従って肉薄となるように、導光板１２と対向する外周面の一部が、管状光源１４の内側へ傾斜するテーパ面２２ａをなしている。このテーパ面２２ａには、フィルム上に銀を蒸着させてなる鏡面シートを貼付することで、鏡面処理がなされている。これにより、図１において矢符Ｌに示すように、管状光源１４より発する光を鏡面処理が施されたテーパ面２２ａで反射させて光入射面１２ｉにおける表示画面エリア９０の端部付近に入射させることができる。   The lamp holder 22 is a cylindrical member having a fitting hole into which the tubular light source 14 is fitted, and a part of the outer peripheral surface facing the light guide plate 12 is tubular so as to become thinner toward the opening end. A tapered surface 22 a that inclines toward the inside of the light source 14 is formed. The taper surface 22a is mirror-finished by applying a mirror surface sheet obtained by vapor-depositing silver on the film. Thereby, as indicated by an arrow L in FIG. 1, the light emitted from the tubular light source 14 is reflected by the tapered surface 22a subjected to the mirror surface treatment and is incident on the vicinity of the end of the display screen area 90 on the light incident surface 12i. be able to.

また、テーパ面２２ａ以外の導光板１２と対向するランプホルダ２２の外周面２２ｂは、導光板１２の光入射面１２ｉの端部と当接しており、ストッパの役割を果たすようになっている。   Further, the outer peripheral surface 22b of the lamp holder 22 facing the light guide plate 12 other than the tapered surface 22a is in contact with the end portion of the light incident surface 12i of the light guide plate 12, and serves as a stopper.

以上のように、面光源装置１０では、導光板１２の光入射面１２ｉより入射した管状光源１４からの線状の光が、照明光として導光板１２の主面１２ａから面状に出射して液晶パネル８２の背面を照射することで、液晶表示装置１００におけるバックライトユニットとして機能する。その際に、非有効発光エリアが表示エリアの内側に有る場合であっても、鏡面処理の施されたテーパ面２２ａが管状光源１４より発せられた光を光入射面１２ｉにおける表示エリア端部に到達するように反射させることができるため、表示画面の角部周辺が暗くなるといった輝度ムラを生じることがなく狭額縁化を図ることができる。   As described above, in the surface light source device 10, linear light from the tubular light source 14 incident from the light incident surface 12 i of the light guide plate 12 is emitted in a planar shape from the main surface 12 a of the light guide plate 12 as illumination light. By irradiating the back surface of the liquid crystal panel 82, the liquid crystal display device 100 functions as a backlight unit. At that time, even when the ineffective light emitting area is inside the display area, the tapered surface 22a subjected to the mirror surface treatment causes the light emitted from the tubular light source 14 to be displayed on the end of the display area on the light incident surface 12i. Since it can be reflected so as to reach, it is possible to reduce the frame without causing luminance unevenness such as darkening around the corner of the display screen.

なお、テーパ面２２ａの鏡面処理は、上記のような鏡面シートの貼付以外に、ランプホルダ２２に銀を直接蒸着することにより行ってもよく、あるいは、金属塗料を塗布することにより行ってもよい。また、本実施形態ではランプホルダ２２のテーパ面２２ａのみに鏡面処理を施したが、本発明はこれに限定されるものではなく、ランプホルダ２２の全面に鏡面処理を施してもよい。   The mirror surface treatment of the tapered surface 22a may be performed by directly depositing silver on the lamp holder 22 or by applying a metal paint in addition to the above-described mirror surface sheet pasting. . In this embodiment, only the tapered surface 22a of the lamp holder 22 is mirror-finished. However, the present invention is not limited to this, and the entire surface of the lamp holder 22 may be mirror-finished.

本発明の一実施形態に係る面光源装置が用いられた液晶表示装置を示す部分断面図である。It is a fragmentary sectional view which shows the liquid crystal display device with which the surface light source device which concerns on one Embodiment of this invention was used. 図１の液晶表示装置の要部断面図である。It is principal part sectional drawing of the liquid crystal display device of FIG.

符号の説明Explanation of symbols

１０…面光源装置
１２…導光板
１２ａ…主面
１２ｉ…光入射面
１４…管状光源
２２…ランプホルダ
２２ａ…テーパ面 DESCRIPTION OF SYMBOLS 10 ... Surface light source device 12 ... Light guide plate 12a ... Main surface 12i ... Light incident surface 14 ... Tubular light source 22 ... Lamp holder 22a ... Tapered surface

Claims (4)

導光板の側面から入射される光を前記導光板の主面から照明光として出射して面発光させる面光源装置において、
前記導光板の側面に沿って配設された管状光源と、前記管状光源の両端部を支持するランプホルダと、を有し、
前記ランプホルダは、前記管状光源内側に向かって漸次に肉薄となるように傾斜するテーパ面を前記導光板側に有し、少なくとも前記テーパ面に鏡面処理がなされていることを特徴とする面光源装置。 In the surface light source device that emits light incident from the side surface of the light guide plate as illumination light from the main surface of the light guide plate,
A tubular light source disposed along a side surface of the light guide plate, and lamp holders supporting both ends of the tubular light source,
The lamp holder has a tapered surface on the light guide plate side that is inclined so as to gradually become thinner toward the inside of the tubular light source, and at least the tapered surface is mirror-finished. apparatus. 前記鏡面処理が、鏡面シートの貼付によりなされていることを特徴とする請求項１に記載の面光源装置。   The surface light source device according to claim 1, wherein the mirror surface processing is performed by pasting a mirror surface sheet. 前記鏡面処理が、塗料の塗布によりなされていることを特徴とする請求項１に記載の面光源装置。   The surface light source device according to claim 1, wherein the mirror surface treatment is performed by applying a paint. 前記鏡面処理が、銀の蒸着によりなされていることを特徴とする請求項１に記載の面光源装置。   The surface light source device according to claim 1, wherein the mirror surface treatment is performed by vapor deposition of silver.
JP2005198008A 2005-07-06 2005-07-06 Planar light source Pending JP2007018824A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008093476A1 (en) 2007-01-30 2008-08-07 Sintokogio, Ltd. Granulated material compression molding method and compression molding apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11258601A (en) * 1998-03-13 1999-09-24 Stanley Electric Co Ltd Illuminator
JP2002109941A (en) * 2000-09-29 2002-04-12 Toshiba Corp Flat light source device, and flat display device using the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11258601A (en) * 1998-03-13 1999-09-24 Stanley Electric Co Ltd Illuminator
JP2002109941A (en) * 2000-09-29 2002-04-12 Toshiba Corp Flat light source device, and flat display device using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008093476A1 (en) 2007-01-30 2008-08-07 Sintokogio, Ltd. Granulated material compression molding method and compression molding apparatus

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