JPH0593909A - Display device - Google Patents
Display deviceInfo
- Publication number
- JPH0593909A JPH0593909A JP3256247A JP25624791A JPH0593909A JP H0593909 A JPH0593909 A JP H0593909A JP 3256247 A JP3256247 A JP 3256247A JP 25624791 A JP25624791 A JP 25624791A JP H0593909 A JPH0593909 A JP H0593909A
- Authority
- JP
- Japan
- Prior art keywords
- lcd
- display device
- aluminum electrode
- electrode
- circuit board
- 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.)
- Granted
Links
- 239000000126 substance Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 abstract description 13
- 230000002159 abnormal effect Effects 0.000 abstract description 10
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 230000001133 acceleration Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 239000005028 tinplate Substances 0.000 abstract description 2
- 229910000679 solder Inorganic materials 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、半透過あるいは透過性
のＬＣＤの後面にそのＬＣＤを照射するために設けられ
たエレクトロルミネッセントライト（以下ＥＬとする）
を有する表示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 an electroluminescent light (hereinafter referred to as EL) provided on a rear surface of a semi-transmissive or transmissive LCD for illuminating the LCD.
The present invention relates to a display device having.
【０００２】[0002]
【従来の技術】近年、表示装置はＬＣＤの普及につれそ
のバックライトとしてＥＬが用いられつつある。しか
し、ＡＣ電圧で駆動されているＥＬは振動を伴いその音
が人間の可聴周波数帯に入り異音として問題となってい
る。2. Description of the Related Art In recent years, EL has been used as a backlight of a display device with the spread of LCD. However, the EL driven by the AC voltage is accompanied by vibration, and its sound enters the human audible frequency band, causing a problem as an abnormal sound.
【０００３】以下図面を参照しながら、上述した従来の
表示装置の一例について説明する。図２は従来の表示装
置の断面図を示すものである。図２において、プリント
基板１上にＬＣＤを支えるホ−ルダ−２とアルミニウム
電極３，発光体４及び透明電極５から構成されたＥＬ、
更にその上にＬＣＤ６が置かれＬＣＤの電極７がホ−ル
ダ−２を貫通してプリント基板１のはんだ面にはんだ付
けされている。ＥＬの両極にはＡＣ１００Ｖ前後の電圧
がかかっており、通常アルミニウム電極３がア−ス，透
明電極５がホットで接続されている。このとき、ＬＣＤ
６には駆動電圧として５Ｖ前後の信号電圧がかけられて
おり、このＬＣＤ６と透明電極５との電位差により静電
結合が生じＡＣ１００Ｖに同期した力が両者間に働く。
この力により、ＬＣＤ６あるいは透明電極５が振動し異
音が発生する。An example of the above-mentioned conventional display device will be described below with reference to the drawings. FIG. 2 is a sectional view of a conventional display device. In FIG. 2, an EL formed by a holder-2 for supporting an LCD, an aluminum electrode 3, a light-emitting body 4 and a transparent electrode 5 on a printed circuit board 1,
Further, the LCD 6 is placed thereon, and the electrode 7 of the LCD penetrates the holder-2 and is soldered to the solder surface of the printed board 1. A voltage of about 100 V AC is applied to both electrodes of the EL, and the aluminum electrode 3 is normally connected to the ground and the transparent electrode 5 is connected to the hot electrode. At this time, LCD
A signal voltage of about 5 V is applied as a drive voltage to 6, and the potential difference between the LCD 6 and the transparent electrode 5 causes electrostatic coupling to exert a force in synchronization with AC 100 V therebetween.
Due to this force, the LCD 6 or the transparent electrode 5 vibrates and abnormal noise is generated.
【０００４】このときの対策例としてＥＬの両面にゴム
等の緩衝材を挿入したり、ＥＬの電気的極性を逆にした
りすることがあるがコストがかかったり、ＥＬの光量が
低下したりする。又、後者は理論的にも明確にされてお
らず、異音が抑え切れない製品もある。他の対策例とし
てアルミ二ウム電極３を透明電極５と挟むように導電性
の第３電極をはりつけ、透明電極５と同じ電位にし、ア
ルミニウム電極３をア−スに落とすという対策案もある
がコストがかかったり、理論的にも明確になっていな
い。As an example of countermeasures at this time, a cushioning material such as rubber may be inserted on both sides of the EL, or the electric polarity of the EL may be reversed, but it is costly and the light amount of the EL is reduced. .. Also, the latter is not clarified theoretically, and there are some products in which abnormal noise cannot be suppressed. As another example of countermeasures, there is a countermeasure that a conductive third electrode is attached so that the aluminum electrode 3 is sandwiched between the transparent electrode 5 and the same potential as that of the transparent electrode 5, and the aluminum electrode 3 is dropped to the ground. It costs money and is not clear in theory.
【０００５】[0005]
【発明が解決しようとする課題】上記のように従来の表
示装置は、コストがかかったり、理論的に明確にされて
いないためすべての製品の対策案として採用できないと
いう問題点を有していた。As described above, the conventional display device has a problem that it cannot be adopted as a measure for all products because it is costly and is not theoretically clarified. ..
【０００６】本発明は、上記従来の問題点に鑑み、異音
の発生メカニズムを簡単な理論で明確にしコストのかか
らない表示装置を提供することを目的としてなされたも
のである。In view of the above conventional problems, the present invention has been made for the purpose of providing a display device in which the generation mechanism of abnormal noise is clarified by a simple theory and the cost is low.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に本発明の表示装置は、半透過あるいは透過性のＬＣＤ
の後面にそのＬＣＤを照射するために設けられたＥＬの
発光面以外の面に、ある質量を有する物質を固定し、尚
且つＥＬの発光面側にある透明電極をア−ス電位に落と
し反対側の電極にＡＣ電圧を加えてＥＬを発光させるも
のである。In order to solve the above problems, the display device of the present invention is a semi-transmissive or transmissive LCD.
A substance having a certain mass is fixed on a surface other than the EL light emitting surface provided for irradiating the LCD on the rear surface of the same, and the transparent electrode on the EL light emitting surface side is dropped to the ground potential to oppose it. The EL is caused to emit light by applying an AC voltage to the side electrode.
【０００８】[0008]
【作用】本発明は上記した構成によって、安いコストで
ＥＬを用いた表示装置の異音を抑えることとなる。With the above-described structure, the present invention can suppress the abnormal noise of the display device using the EL at a low cost.
【０００９】[0009]
【実施例】以下、本発明の表示装置の実施例について、
図面を参照しながら詳細に説明する。図１は本発明の実
施例における表示装置の断面図を示すものである。EXAMPLES Examples of the display device of the present invention will be described below.
A detailed description will be given with reference to the drawings. FIG. 1 is a sectional view of a display device according to an embodiment of the present invention.
【００１０】図１において、プリント基板１上にＬＣＤ
ノイズがプリント基板に入らないようにするためのシ−
ルド用ブリキ板８が置かれプリント基板１をその脚が貫
通してプリント基板のはんだ面にはんだ付けされてい
る。その上にＬＣＤを支えるホ−ルダ−２とアルミニウ
ム電極３，発光体４及び透明電極５から構成されたＥ
Ｌ、が両面テ−プ９によって接着されており更にその上
にＬＣＤ６が置かれＬＣＤの電極７がホ−ルダ−２を貫
通してプリント基板１のはんだ面にはんだ付けされてい
る。In FIG. 1, an LCD is provided on a printed circuit board 1.
A shield to prevent noise from entering the printed circuit board.
A tin plate 8 for a field is placed and the legs thereof penetrate the printed board 1 and are soldered to the solder surface of the printed board. An E composed of a holder-2 for supporting the LCD, an aluminum electrode 3, a light-emitting body 4 and a transparent electrode 5 thereon.
L and L are adhered by a double-sided tape 9, and the LCD 6 is placed on the double-sided tape 9. The electrodes 7 of the LCD penetrate the holder-2 and are soldered to the solder surface of the printed board 1.
【００１１】以上のように構成された表示装置につい
て、以下その動作について説明する。まず、ＥＬの両極
にはＡＣ１００Ｖ前後の電圧がかかっており、アルミニ
ウム電極３がホット，透明電極５がア−スで接続されて
いる。このとき、ＬＣＤ６には駆動電圧として５Ｖ前後
の信号電圧がかけられており、このＬＣＤ６と透明電極
５との電位差は５Ｖ程度で小さいため静電結合が小さく
両者間に働く力も小さい。又、アルミニウム電極３とシ
−ルド板８との電位差により静電結合が生じＡＣ１００
Ｖに同期した力が両者間に働く。両者間に働く力をＦ，
その物質の質量をＭ，その物質に生じる加速度をａとす
ると、Ｆ＝Ｍａとなる。The operation of the display device constructed as above will be described below. First, a voltage of about 100 V AC is applied to both electrodes of the EL, the aluminum electrode 3 is hot, and the transparent electrode 5 is grounded. At this time, a signal voltage of about 5 V is applied to the LCD 6 as a drive voltage, and the potential difference between the LCD 6 and the transparent electrode 5 is about 5 V, so that the electrostatic coupling is small and the force acting between them is also small. Further, electrostatic coupling occurs due to the potential difference between the aluminum electrode 3 and the shield plate 8
The force synchronized with V works between them. The force that acts between them is F,
If the mass of the substance is M and the acceleration generated in the substance is a, then F = Ma.
【００１２】しかし、アルミニウム電極３はＬＣＤホ−
ルダ−２に両面テ−プで固定されており、シ−ルド板８
はプリント基板１に固定されているためそれぞれの質量
はＬＣＤホ−ルダ−分あるいは、プリント基板分増加し
ており、同一の力Ｆが生じた場合、質量Ｍが増加すると
ＥＬの加速度ａは減少する。つまり異音は抑えられるこ
とになる。実際にある製品でテストすると約１４ｄＢ
（Ａカ−ブ）異音が減衰した。However, the aluminum electrode 3 is connected to the LCD
It is fixed to the ruder-2 with double-sided tape, and the shield plate 8
Are fixed to the printed circuit board 1, the mass of each is increased by the amount of the LCD holder or the printed circuit board. When the same force F is generated, the acceleration a of EL decreases when the mass M increases. To do. That is, the abnormal noise can be suppressed. Approximately 14 dB when tested with an actual product
(A curve) Abnormal noise is attenuated.
【００１３】以上のように本実施例によれば、安いコス
トで、ＥＬを用いた表示装置の異音を抑えることとな
る。又、ＥＬの周辺の部品構成により的確な対策案が講
じられる。As described above, according to the present embodiment, the abnormal noise of the display device using EL can be suppressed at a low cost. In addition, appropriate countermeasures are taken depending on the configuration of parts around the EL.
【００１４】[0014]
【発明の効果】以上のように本発明は、半透過あるいは
透過性のＬＣＤの後面にそのＬＣＤを照射するために設
けられたＥＬの発光面以外の面に、ある質量を有する物
質を固定し、尚且つＥＬの発光面側にある透明電極をア
−ス電位に落とし反対側の電極にＡＣ電圧を加えてＥＬ
を発光させた場合の異音を減少させることができる。INDUSTRIAL APPLICABILITY As described above, according to the present invention, a substance having a certain mass is fixed on the rear surface of a semi-transmissive or transmissive LCD other than the light emitting surface of the EL provided for irradiating the LCD. In addition, the transparent electrode on the light emitting surface side of the EL is lowered to the ground potential, and an AC voltage is applied to the electrode on the other side, thereby EL
It is possible to reduce the abnormal noise when the light is emitted.
【図１】本発明の第１の実施例における表示装置の断面
図である。FIG. 1 is a sectional view of a display device according to a first embodiment of the present invention.
【図２】従来の実施例における表示装置の断面図であ
る。FIG. 2 is a cross-sectional view of a display device according to a conventional example.
１ プリント基板 ２ ＬＣＤホ−ルダ− ３ ＥＬのアルミニウム電極 ５ ＥＬの透明電極 ６ ＬＣＤ ８ シ−ルド板 ９ 両面テ−プ 1 Printed Circuit Board 2 LCD Holder 3 EL Aluminum Electrode 5 EL Transparent Electrode 6 LCD 8 Shield Plate 9 Double-sided Tape
Claims (1)
そのＬＣＤを照射するために設けられたエレクトロルミ
ネッセントライトの発光面以外の面に、ある質量を有す
る物質を固定し、尚且つＥＬの発光面側にある透明電極
をア−ス電位に落とし反対側の電極にＡＣ電圧を加えて
ＥＬを発光させることを特徴とする表示装置。1. A substance having a certain mass is fixed on a surface other than a light emitting surface of an electroluminescent light provided on the rear surface of a semi-transmissive or transmissive LCD for illuminating the LCD, and the EL A display device characterized in that the transparent electrode on the light emitting surface side is dropped to the ground potential and an AC voltage is applied to the electrode on the opposite side to cause the EL to emit light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3256247A JP2855916B2 (en) | 1991-10-03 | 1991-10-03 | Display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3256247A JP2855916B2 (en) | 1991-10-03 | 1991-10-03 | Display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0593909A true JPH0593909A (en) | 1993-04-16 |
| JP2855916B2 JP2855916B2 (en) | 1999-02-10 |
Family
ID=17289985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3256247A Expired - Fee Related JP2855916B2 (en) | 1991-10-03 | 1991-10-03 | Display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2855916B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4433310A1 (en) * | 1994-09-20 | 1996-04-11 | Valeo Borg Instr Verw Gmbh | Display device with cells spaced apart from one another |
| WO1999025157A1 (en) * | 1997-11-12 | 1999-05-20 | Mitsubishi Denki Kabushiki Kaisha | Electroluminescent light and structure for shielding the same |
| GB2334808A (en) * | 1998-02-27 | 1999-09-01 | Nec Corp | Noise preventing shield for liquid crystal display device |
| RU2648538C2 (en) * | 2013-12-06 | 2018-03-26 | Дзе Йокогама Раббер Ко., Лтд. | Pneumatic tire |
| US10131188B2 (en) | 2013-10-24 | 2018-11-20 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
-
1991
- 1991-10-03 JP JP3256247A patent/JP2855916B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4433310A1 (en) * | 1994-09-20 | 1996-04-11 | Valeo Borg Instr Verw Gmbh | Display device with cells spaced apart from one another |
| US5663776A (en) * | 1994-09-20 | 1997-09-02 | Valeo Borg Instruments Verwaltung Gmbh | Display device with cells arranged at distance from each other via angularly shaped supports having spacer legs |
| WO1999025157A1 (en) * | 1997-11-12 | 1999-05-20 | Mitsubishi Denki Kabushiki Kaisha | Electroluminescent light and structure for shielding the same |
| GB2334808A (en) * | 1998-02-27 | 1999-09-01 | Nec Corp | Noise preventing shield for liquid crystal display device |
| GB2334808B (en) * | 1998-02-27 | 2002-06-05 | Nec Corp | Liquid crystal display device |
| US6456342B1 (en) | 1998-02-27 | 2002-09-24 | Nec Corporation | LCD device having a noise-shield layer directly between LCD and EL panel |
| US10131188B2 (en) | 2013-10-24 | 2018-11-20 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
| RU2648538C2 (en) * | 2013-12-06 | 2018-03-26 | Дзе Йокогама Раббер Ко., Лтд. | Pneumatic tire |
| US10766317B2 (en) | 2013-12-06 | 2020-09-08 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2855916B2 (en) | 1999-02-10 |
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