JP3211244B2 - Backlight system - Google Patents
Backlight systemInfo
- Publication number
- JP3211244B2 JP3211244B2 JP22917490A JP22917490A JP3211244B2 JP 3211244 B2 JP3211244 B2 JP 3211244B2 JP 22917490 A JP22917490 A JP 22917490A JP 22917490 A JP22917490 A JP 22917490A JP 3211244 B2 JP3211244 B2 JP 3211244B2
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent tube
- terminal
- terminals
- capacitor
- tube driving
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、液晶パネル用バックライト装置（バックラ
イトシステム）に関する。The present invention relates to a backlight device for a liquid crystal panel (backlight system).
従来のバックライトシステムは、蛍光管と点灯回路は
分離され、両者をコード等で接続しているものが多かっ
た。以下図面を参照しながら、従来のバックライトシス
テムの一例を説明する。第２図は、従来のバックライト
システムを示す斜視図である。第２図において、101は
蛍光管で管の両端に端子電極102を設けている。103は光
源用電源で蛍光管保持基板104上に固定されており、蛍
光管101を固定すると共に電気的な接続もとっている。1
06は蛍光管駆動回路プリント基板でこの上には、蛍光管
駆動トランス107の他電気素子が実装されている。蛍光
管駆動回路プリント基板106には、電源コード109で電力
が供給されており、蛍光管駆動回路プリント基板106と
蛍光管保持基板104の間は、蛍光管駆動コード108で接続
されている。In a conventional backlight system, a fluorescent tube and a lighting circuit are separated, and in many cases, both are connected by a cord or the like. Hereinafter, an example of a conventional backlight system will be described with reference to the drawings. FIG. 2 is a perspective view showing a conventional backlight system. In FIG. 2, reference numeral 101 denotes a fluorescent tube provided with terminal electrodes 102 at both ends of the tube. A light source 103 is fixed on the fluorescent tube holding substrate 104 to fix the fluorescent tube 101 and to make an electrical connection. 1
Reference numeral 06 denotes a fluorescent tube driving circuit printed circuit board, on which other electric elements of the fluorescent tube driving transformer 107 are mounted. Power is supplied to the fluorescent tube driving circuit printed circuit board 106 by a power cord 109, and the fluorescent tube driving circuit printed circuit board 106 and the fluorescent tube holding substrate 104 are connected by a fluorescent tube driving code 108.
しかしながら、上記のバックライトシステムにおいて
下記の問題点があった。However, the above backlight system has the following problems.
1.蛍光管駆動コード108で蛍光管の高圧部を長く引きま
わさなくてはならないので、高圧部における容量結合に
より、パワーロスがおこり蛍光管の輝度が低い、始動性
が悪い。1. Since the high voltage portion of the fluorescent tube must be extended for a long time by the fluorescent tube driving code 108, power loss occurs due to capacitive coupling in the high voltage portion, the brightness of the fluorescent tube is low, and the startability is poor.
2.蛍光管駆動高電圧部が長くひきのばされるため、高電
圧部よりもれ出るノイズを除去することが困難。2. It is difficult to remove noise leaking from the high voltage part because the high voltage part of the fluorescent tube drive is prolonged.
ここで１項で挙げた容量結合について、第３図のバッ
クライト回路図を用いて詳しく説明する。第３図におい
て101′は蛍光管、107′はバックライトトランス、10
8′は蛍光管駆動コードに相当する部分を示す。ここで
例えば長さ100mm投影面積100mm2の蛍光管駆動コードが
高圧側とグランド側双方が平行に密着して配置された場
合、高圧側とグランド側の間には、下記の式で表わされ
る容量が浮遊容量として結合する。ここでリード線の被
覆の厚み1mm誘電率を４とする。Here, the capacitive coupling described in item 1 will be described in detail with reference to the backlight circuit diagram of FIG. In FIG. 3, 101 'is a fluorescent tube, 107' is a backlight transformer, 10 '
8 'indicates a portion corresponding to a fluorescent tube driving code. Here, for example, when a fluorescent tube driving cord having a length of 100 mm and a projection area of 100 mm 2 is arranged in close contact with both the high voltage side and the ground side in parallel, a capacitance represented by the following formula is provided between the high voltage side and the ground side. Are coupled as stray capacitance. Here, the thickness of the coating of the lead wire is 1 mm and the dielectric constant is 4.
ここで、Ｓは蛍光管駆動コードの投影面積、εｒは、
被覆の誘電率、ｄは被覆の厚さを表わす。つまり、容量
結合としてCA＝3.56PFがついてしまう。Ｂポイントにお
いてコンデンサＣ及び、蛍光管101′を接続しない場合
の電圧が2800VP-PだとするとCAの容量結合がない場合、
始動時蛍光管には2800VP-Pの電圧がかかることになる。
しかしながらCAの容量がついてしまうとコンデンサーＣ
とCAにより分圧され蛍光管には下記の電圧しか、かから
なくなる。 Here, S is the projected area of the fluorescent tube driving code, and ε r is
The dielectric constant of the coating, d, represents the thickness of the coating. That is, C A = 3.56 PF is added as capacitive coupling. When the capacitor C and the B point, the voltage in the case of not connecting the fluorescent tube 101 'is no capacitive coupling of 2800V PP Datosuruto C A,
At startup, a voltage of 2800 V PP is applied to the fluorescent tube.
However, when the capacity of C A is added, the capacitor C
And only divided by following voltage to the fluorescent tube by C A, not less.
上記電圧は、蛍光管駆動コード108′における容量結
合のみを考えたが実際には、蛍光管駆動回路プリント基
板及び蛍光管保持基板上での配線上の容量が２〜3PF上
乗せされる。つまり VFL＝2336VP-Pしか実際には、蛍光管にかからないこと
になる。つまり、容量結合が大きいと蛍光管にかかる電
圧が下がり、蛍光管の点灯が困難となる。特に液晶TV等
の乾電池（アルカリマンガン電池・マンガン電池等）を
使用する機器においては、入力電圧が下がってくると蛍
光管が点灯しないつまりは電池寿命が短いといった問題
となる。 Although the above voltage is considered only for the capacitive coupling in the fluorescent tube driving code 108 ', actually, the capacitance on the wiring on the fluorescent tube driving circuit printed board and the fluorescent tube holding substrate is added by 2 to 3 PF. I mean In fact, only V FL = 2336 V PP will be applied to the fluorescent tube. That is, if the capacitive coupling is large, the voltage applied to the fluorescent tube decreases, and it becomes difficult to turn on the fluorescent tube. In particular, in a device using a dry battery (such as an alkaline manganese battery or a manganese battery) such as a liquid crystal TV, there is a problem that the fluorescent tube does not turn on when the input voltage decreases, that is, the battery life is short.
本発明のバックライト装置は、同一方向に揃えられた
２つの端末を有する蛍光管と、高圧側出力端子を有する
とともに該２つの端末の間に位置するトランスと、該２
つの端末の一方に電気的に接続された第１の端子および
該高圧側出力端子に電気的に接続された第２の端子を有
するコンデンサであって、該２つの端末の一方と該高圧
側出力端子とを電気的に結合するコンデンサと、を備え
ていて、そして、該コンデンサの第１の端子は該２つの
端末の一方に近接しており、該コンデンサの第２の端子
は該高圧側出力端子に近接している。The backlight device of the present invention includes a fluorescent tube having two terminals aligned in the same direction, a transformer having a high-voltage output terminal and located between the two terminals,
A capacitor having a first terminal electrically connected to one of the two terminals and a second terminal electrically connected to the high-side output terminal, wherein one of the two terminals and the high-side output And a capacitor electrically coupling the terminal to the terminal, and a first terminal of the capacitor is proximate to one of the two terminals, and a second terminal of the capacitor is connected to the high side output. Close to terminals.
第１図に、本発明の一実施例の斜視図を示す。１は、
蛍光管で蛍光管端末２を同一方向にそろえてある。６
は、蛍光管駆動回路プリント基板でこの上には、蛍光管
駆動トランス７の他、蛍光管駆動素子が実装されてい
る。蛍光管駆動回路プリント基板６には、電源コード９
が接続され電力が供給されている。８は、蛍光管駆動ト
ランス７の高圧側出力と蛍光管端末２の高圧側の結線パ
ターンを示す。第４図に、８の結線パターンの拡大図を
示す。第４図から解る様に、蛍光管駆動トランス７の高
圧側出力を蛍光管端末２の高圧側の結線パターンは10mm
以下で結線可能となり、グランド電位と高圧側の結線パ
ターンは完全に隔離できるため、結合容量はほとんど無
視することができる。また、蛍光管端末２の間に蛍光管
駆動トランス７を配置したことにより、回路実装スペー
ス上大きなウェートを占めていた蛍光管駆動トランス７
を効率良く配置することが可能となる。つまり、蛍光管
端末部２は、発光せず従来有効部外に配置してきたがこ
の端末部２の周辺は高圧部でもあり、今まで有効利用す
ることができず、空間部として残っている場合が多かっ
た。この端末部２の間に蛍光管駆動トランス７を配置し
たことにより従来の空間部を有効利用でき、セット全体
の省スペース化が可能となった。第５図に、本発明の他
の実施例の斜視図を示す。第５図においては、蛍光管駆
動トランス７、高圧側の結線パターン８及び蛍光管端末
２をシールド板10でおおっている。従来、蛍光管及び蛍
光管駆動回路より発せられるノイズが回路上大きな問題
となっている。従来は駆動回路と蛍光管は分離されてい
るため、シールドすることが構造上非常に困難であっ
た。しかし第５図に示す様に、本実施例によれば、駆動
回路と蛍光管が近接しシールドするのが容易である。FIG. 1 shows a perspective view of one embodiment of the present invention. 1 is
The fluorescent tube terminals 2 are aligned in the same direction with the fluorescent tubes. 6
Is a fluorescent tube driving circuit printed circuit board, on which a fluorescent tube driving element in addition to the fluorescent tube driving transformer 7 is mounted. The fluorescent tube driving circuit printed circuit board 6 has a power cord 9
Is connected and power is supplied. 8 shows a connection pattern between the high-voltage side output of the fluorescent tube driving transformer 7 and the high-voltage side of the fluorescent tube terminal 2. FIG. 4 shows an enlarged view of the connection pattern 8. As can be seen from FIG. 4, the high voltage side output of the fluorescent tube driving transformer 7 is connected to the high voltage side wiring pattern of the fluorescent tube terminal 2 by 10 mm.
In the following, connection becomes possible, and the ground potential and the connection pattern on the high voltage side can be completely isolated, so that the coupling capacitance can be almost ignored. Further, since the fluorescent tube driving transformer 7 is arranged between the fluorescent tube terminals 2, the fluorescent tube driving transformer 7 occupies a large weight in the circuit mounting space.
Can be efficiently arranged. In other words, the fluorescent tube terminal 2 has conventionally been disposed outside the effective portion without emitting light, but the periphery of the terminal 2 is also a high voltage portion, and cannot be effectively used until now, and remains as a space portion. There were many. By arranging the fluorescent tube driving transformer 7 between the terminals 2, the conventional space can be effectively used, and the space of the entire set can be saved. FIG. 5 shows a perspective view of another embodiment of the present invention. In FIG. 5, the fluorescent tube driving transformer 7, the connection pattern 8 on the high voltage side, and the fluorescent tube terminal 2 are covered with a shield plate 10. Conventionally, noise generated from the fluorescent tube and the fluorescent tube driving circuit has been a major problem in the circuit. Conventionally, since the driving circuit and the fluorescent tube are separated from each other, it has been very difficult to shield them structurally. However, as shown in FIG. 5, according to the present embodiment, the drive circuit and the fluorescent tube are close to each other and it is easy to shield.
本発明のバックライト装置は、同一方向に揃えられた
２つの端末を有する蛍光管と、高圧側出力端子を有する
とともに該２つの端末の間に位置するトランスと、該２
つの端末の一方に電気的に接続された第１の端子および
該高圧側出力端子に電気的に接続された第２の端子を有
するコンデンサであって、該２つの端末の一方と該高圧
側出力端子とを電気的に結合するコンデンサと、を備え
ていて、そして、該コンデンサの第１の端子は該２つの
端末の一方に近接しており、該コンデンサの第２の端子
は該高圧側出力端子に近接していて、これらのことによ
って、高圧側の配線長が短くなり、このため、高圧側の
配線と基板間との容量結合が小さくなり、かつ高圧側の
配線とグランド側の配線との間の浮遊容量が小さくな
る。この結果、容量結合に伴う始動特性の悪化を抑える
ことができる。The backlight device of the present invention includes a fluorescent tube having two terminals aligned in the same direction, a transformer having a high-voltage output terminal and located between the two terminals,
A capacitor having a first terminal electrically connected to one of the two terminals and a second terminal electrically connected to the high-side output terminal, wherein one of the two terminals and the high-side output And a capacitor electrically coupling the terminal to the terminal, and a first terminal of the capacitor is proximate to one of the two terminals, and a second terminal of the capacitor is connected to the high side output. Close to the terminals, these factors reduce the high-voltage side wiring length, which reduces the capacitive coupling between the high-voltage side wiring and the board, and reduces the high-voltage side wiring and ground-side wiring. The stray capacitance between the two becomes smaller. As a result, it is possible to suppress the deterioration of the starting characteristics due to the capacitive coupling.
第１図は、本発明の一実施例の斜視図。 第２図は、従来のバックライトシステムを示す斜視図。 第３図は、バックライト回路図。 第４図は、結線パターンの拡大図。 第５図は、本発明の他の実施例の斜視図。 １……蛍光管 ２……蛍光管端末 ６……蛍光管駆動回路プリント基板 ７……蛍光管駆動トランス ８……結線パターン ９……電源コード 10……シールド板 FIG. 1 is a perspective view of one embodiment of the present invention. FIG. 2 is a perspective view showing a conventional backlight system. FIG. 3 is a backlight circuit diagram. FIG. 4 is an enlarged view of a connection pattern. FIG. 5 is a perspective view of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Fluorescent tube 2 ... Fluorescent tube terminal 6 ... Fluorescent tube driving circuit printed circuit board 7 ... Fluorescent tube driving transformer 8 ... Connection pattern 9 ... Power cord 10 ... Shield plate
Claims (1)
蛍光管と、 高圧側出力端子を有するとともに該２つの端末の間に位
置するトランスと、 該２つの端末の一方に電気的に接続された第１の端子お
よび該高圧側出力端子に電気的に接続された第２の端子
を有するコンデンサであって、該２つの端末の一方と該
高圧側出力端子とを電気的に結合するコンデンサと、を
備えたバックライト装置であって、 該コンデンサの第１の端子は該２つの端末の一方に近接
しており、該コンデンサの第２の端子は該高圧側出力端
子に近接している、バックライト装置。1. A fluorescent tube having two terminals aligned in the same direction, a transformer having a high-voltage output terminal and located between the two terminals, and electrically connected to one of the two terminals. Having a first terminal and a second terminal electrically connected to the high-voltage output terminal, wherein the capacitor electrically connects one of the two terminals to the high-voltage output terminal. Wherein the first terminal of the capacitor is close to one of the two terminals, and the second terminal of the capacitor is close to the high-voltage output terminal. , Backlight device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22917490A JP3211244B2 (en) | 1990-08-30 | 1990-08-30 | Backlight system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22917490A JP3211244B2 (en) | 1990-08-30 | 1990-08-30 | Backlight system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04109286A JPH04109286A (en) | 1992-04-10 |
| JP3211244B2 true JP3211244B2 (en) | 2001-09-25 |
Family
ID=16887952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22917490A Expired - Lifetime JP3211244B2 (en) | 1990-08-30 | 1990-08-30 | Backlight system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3211244B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3138761B2 (en) * | 1992-11-25 | 2001-02-26 | 牛嶋 昌和 | Lighting circuit |
| JP3688915B2 (en) | 1998-11-27 | 2005-08-31 | 株式会社 日立ディスプレイズ | Liquid crystal display device |
-
1990
- 1990-08-30 JP JP22917490A patent/JP3211244B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04109286A (en) | 1992-04-10 |
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