JPH1131591A - Method and device for driving discharge device, lighting system, and liquid crystal display device - Google Patents
Method and device for driving discharge device, lighting system, and liquid crystal display deviceInfo
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- JPH1131591A JPH1131591A JP18477097A JP18477097A JPH1131591A JP H1131591 A JPH1131591 A JP H1131591A JP 18477097 A JP18477097 A JP 18477097A JP 18477097 A JP18477097 A JP 18477097A JP H1131591 A JPH1131591 A JP H1131591A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は可視光、紫外光等を
放射する放電装置に関し、より詳細には屋内外の照明
用、表示用、機器用または液晶表示装置用のバックライ
ト等に用いられる放電装置の駆動方法、放電装置の駆動
装置、放電装置を用いた照明装置および照明装置を用い
た液晶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 a discharge device for radiating visible light, ultraviolet light, etc., and more particularly to a backlight for indoor / outdoor lighting, display, equipment or liquid crystal display devices. The present invention relates to a method for driving a discharge device, a drive device for a discharge device, an illumination device using the discharge device, and a liquid crystal display device using the illumination device.
【０００２】[0002]
【従来の技術】放電を用いた光源、たとえば照明用や表
示用の蛍光ランプや平板型の放電装置等を駆動するには
種々の方法がある。たとえば、液晶表示装置のバックラ
イト用インバータや高周波点灯の蛍光ランプ等の一般的
な放電装置の駆動には、数十ｋＨｚの高周波を用いてい
る。これらの駆動方法の効率改善例として、たとえば特
願平８−１９１８０５号の明細書、図面に記載されてい
る放電装置の駆動方法がある。2. Description of the Related Art There are various methods for driving a light source using discharge, for example, a fluorescent lamp for illumination or display, a flat discharge device, and the like. For example, a high frequency of several tens of kHz is used for driving a general discharge device such as a backlight inverter of a liquid crystal display device and a high frequency lighting fluorescent lamp. Examples of the efficiency improvement of these driving methods include, for example, a driving method of a discharge device described in the specification and drawings of Japanese Patent Application No. 8-191805.
【０００３】図１２は上記従来の放電装置の駆動方法に
おける駆動電圧波形を示すグラフである。すなわち、上
記従来の放電装置の駆動方法においては、放電装置に２
つの電極を設け、図１２(ａ)に示すように、一方の電極
に基本の矩形波の電圧パルス６１に電圧パルス６１より
も高い周波数を有する高周波パルス６３を重畳した電圧
Ｖ５を印加し、図１２(ｂ)に示すように、他方の電極に
電圧パルス６１と位相が半周期ずれた電圧パルス６２に
電圧パルス６２よりも高い周波数を有する高周波パルス
６４を重畳した電圧Ｖ６を印加して、交流放電を行な
う。FIG. 12 is a graph showing a drive voltage waveform in the above-described conventional discharge device driving method. That is, in the conventional driving method of the discharge device, the discharge device has
12A, a voltage V5 in which a high-frequency pulse 63 having a higher frequency than the voltage pulse 61 is superimposed on a basic rectangular-wave voltage pulse 61 is applied to one electrode as shown in FIG. As shown in FIG. 12 (b), a voltage V6 in which a high-frequency pulse 64 having a higher frequency than the voltage pulse 62 is superimposed on a voltage pulse 62 having a phase shifted by half a cycle from the voltage pulse 61 is applied to the other electrode. Perform discharge.
【０００４】[0004]
【発明が解決しようとする課題】上記した従来の放電装
置の駆動方法は、高輝度、高効率な放電装置が得られる
特徴があるが、高周波パルス６３、６４を重畳した電圧
パルス６１、６２で放電の発生、維持を行なっているか
ら、放電長が長くなると高電圧が必要になるので、高耐
圧の回路部品を使用しなければならず、しかも回路構成
も複雑になるので、回路コストが高くなり、また高周波
ノイズが大きくなり、さらに高周波パルス６３、６４が
制御しにくいので、放電が不安定になりやすい。The above-described conventional driving method of a discharge device has a feature that a high-luminance and high-efficiency discharge device can be obtained. Since the discharge is generated and maintained, a longer discharge length requires a higher voltage, which requires the use of high-withstand voltage circuit components, and also complicates the circuit configuration, resulting in a higher circuit cost. In addition, high-frequency noise increases, and the high-frequency pulses 63 and 64 are difficult to control, so that discharge tends to become unstable.
【０００５】本発明は上述した課題を解決するためにな
されたもので、輝度、効率を向上でき、しかも回路コス
トが安価であり、高周波ノイズが小さく、放電が安定で
ある放電装置の駆動方法、放電装置の駆動装置、照明装
置、液晶表示装置を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of driving a discharge device which can improve luminance and efficiency, has a low circuit cost, has a low frequency noise, and has a stable discharge. It is an object to provide a driving device of a discharge device, a lighting device, and a liquid crystal display device.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明においては、複数の電極を有する放電装置の
駆動方法において、上記電極の少なくとも１つに第１の
周波数を有する第１の電圧を印加し、他の上記電極に上
記第１の周波数より高い第２の周波数を有する第２の電
圧を印加する。To achieve the above object, according to the present invention, in a method for driving a discharge device having a plurality of electrodes, a first voltage having a first frequency is applied to at least one of the electrodes. And a second voltage having a second frequency higher than the first frequency is applied to the other electrodes.
【０００７】また、複数の電極を有する放電装置の駆動
方法において、上記電極の少なくとも１つに第１の周波
数を有する第１の電圧と上記第１の周波数より高い第２
の周波数を有する第２の電圧とを交互に印加し、他の上
記電極に上記第２の電圧と上記第１の電圧とを交互に印
加する。In a method of driving a discharge device having a plurality of electrodes, at least one of the electrodes has a first voltage having a first frequency and a second voltage higher than the first frequency.
And a second voltage having a frequency of .times. Is alternately applied, and the second voltage and the first voltage are alternately applied to the other electrodes.
【０００８】また、少なくとも３つの電極を有する放電
装置の駆動方法において、上記電極の少なくとも１つに
第１の周波数を有する第３の電圧を印加し、他の上記電
極に上記第１の周波数を有しかつ位相が第３の電圧と半
周期ずれた第４の電圧を印加し、さらに他の上記電極に
上記第１の周波数より高い第２の周波数を有する第２の
電圧を印加する。In a driving method of a discharge device having at least three electrodes, a third voltage having a first frequency is applied to at least one of the electrodes, and the first frequency is applied to the other electrodes. A fourth voltage having a phase shifted from the third voltage by a half cycle is applied, and a second voltage having a second frequency higher than the first frequency is applied to the other electrodes.
【０００９】これらの場合、上記電極を放電空間の外部
に設ける。In these cases, the electrodes are provided outside the discharge space.
【００１０】また、上記第１の周波数を２ｋＨｚから１
ＭＨｚの間から選んだ周波数とする。Further, the first frequency is increased from 2 kHz to 1
MHz.
【００１１】また、上記第２の周波数を２．５ＭＨｚか
ら５０ＭＨｚの間から選んだ周波数とする。The second frequency is a frequency selected from the range of 2.5 MHz to 50 MHz.
【００１２】また、上記第１、第３、第４の電圧として
電圧波形が矩形波のものまたは電圧波形が矩形のパルス
波のものを用いる。The first, third, and fourth voltages have a rectangular voltage waveform or a rectangular pulse waveform.
【００１３】また、複数の電極を有する放電装置の駆動
装置において、上記電極の少なくとも１つに第１の周波
数を有する第１の電圧を印加する第１の駆動電圧発生回
路を接続し、他の上記電極に上記第１の周波数より高い
第２の周波数を有する第２の電圧を印加する第２の駆動
電圧発生回路を接続する。In a driving apparatus for a discharge device having a plurality of electrodes, a first driving voltage generating circuit for applying a first voltage having a first frequency is connected to at least one of the electrodes, A second drive voltage generation circuit for applying a second voltage having a second frequency higher than the first frequency is connected to the electrode.
【００１４】また、複数の電極を有する放電装置の駆動
装置において、上記電極の少なくとも１つに第１の周波
数を有する第１の電圧と上記第１の周波数より高い第２
の周波数を有する第２の電圧とを交互に印加する第３の
駆動電圧発生回路を接続し、他の上記電極に上記第２の
電圧と上記第１の電圧とを交互に印加する第４の駆動電
圧発生回路を接続する。In a driving apparatus for a discharge device having a plurality of electrodes, at least one of the electrodes has a first voltage having a first frequency and a second voltage higher than the first frequency.
A third driving voltage generating circuit for alternately applying a second voltage having a frequency of .times. And a fourth driving voltage for alternately applying the second voltage and the first voltage to the other electrodes; Connect the drive voltage generation circuit.
【００１５】また、少なくとも３つの電極を有する放電
装置の駆動装置において、上記電極の少なくとも１つに
第１の周波数を有する第３の電圧を印加する第５の駆動
電圧発生回路を接続し、他の上記電極に上記第１の周波
数を有しかつ位相が第３の電圧と半周期ずれた第４の電
圧を印加する第６の駆動電圧発生回路を接続し、さらに
他の上記電極に上記第１の周波数より高い第２の周波数
を有する第２の電圧を印加する第２の駆動電圧発生回路
を接続する。In a driving apparatus for a discharge device having at least three electrodes, a fifth driving voltage generating circuit for applying a third voltage having a first frequency to at least one of the electrodes is connected. A sixth driving voltage generating circuit for applying a fourth voltage having the first frequency and having a phase shifted by a half cycle from the third voltage to the third electrode is connected to the other electrode; A second drive voltage generating circuit for applying a second voltage having a second frequency higher than the first frequency is connected.
【００１６】また、照明装置において、上記の放電装置
の駆動方法により点灯させた放電装置を用いて被照明体
を照明するよう構成する。In the lighting device, the object to be illuminated is illuminated by using the discharge device which is turned on by the above-described method for driving the discharge device.
【００１７】また、液晶表示装置において、上記の照明
装置を用いる。In the liquid crystal display device, the above-described lighting device is used.
【００１８】[0018]
【発明の実施の形態】図１は本発明に係る放電管の駆動
方法を実施するための装置、すなわち本発明に係る放電
管の駆動装置を示す概略図である。図に示すように、放
電管１０の放電管本体１２の外面にすなわち放電空間の
外部に一対の電極４１、４２が設けられ、放電管本体１
２の外径寸法は３ｍｍで、放電管本体１２の内壁面には
蛍光体が塗布され、放電管本体１２内に水銀とＮｅ−Ａ
ｒとが封入され、電極４１、４２の長さは１０ｍｍであ
る。また、電極４１に第１の周波数を有しかつ電圧波形
が矩形波（略矩形波を含む）の第１の電圧Ｖ１ａを発生
する第１の駆動電圧発生回路５１ａが接続され、電極４
２に第１の周波数より高い第２の周波数を有し、電圧値
が一定でありかつ電圧波形が正弦波の第２の電圧Ｖ２を
発生する第２の駆動電圧発生回路５２が接続されてい
る。すなわち、本発明に係る放電管の駆動方法において
は、電極４１に電圧Ｖ１ａを印加し、電極４２に電圧Ｖ
２を印加する。FIG. 1 is a schematic diagram showing an apparatus for carrying out a method for driving a discharge tube according to the present invention, that is, a driving apparatus for a discharge tube according to the present invention. As shown in the drawing, a pair of electrodes 41 and 42 are provided on the outer surface of the discharge tube body 12 of the discharge tube 10, that is, outside the discharge space, and the discharge tube body 1
2 has an outer diameter of 3 mm, a phosphor is applied to the inner wall surface of the discharge tube body 12, and mercury and Ne-A
r is sealed, and the length of the electrodes 41 and 42 is 10 mm. The electrode 41 is connected to a first drive voltage generation circuit 51a which generates a first voltage V1a having a first frequency and a voltage waveform of a rectangular wave (including a substantially rectangular wave).
2 is connected to a second drive voltage generating circuit 52 having a second frequency higher than the first frequency, generating a second voltage V2 having a constant voltage value and a sinusoidal voltage waveform. . That is, in the method for driving a discharge tube according to the present invention, the voltage V1a is applied to the electrode 41 and the voltage V1a is applied to the electrode 42.
2 is applied.
【００１９】この放電管の駆動方法、駆動装置において
は、電極４１に印加した電圧Ｖ１ａにより放電の発生、
形成が行なわれ、電極４２に印加した電圧Ｖ２が放電管
本体１２内のプラズマ中で重畳された放電が維持され、
電子温度が可視光あるいは紫外光を放射するために好ま
しい値に近づく。このため、数百ボルトの低電圧で駆動
しても、千ボルト以上の高電圧を印加したと同じ輝度を
得ることができ、高輝度、高効率の放電装置が実現でき
る。そして、高周波の高電圧が必要になることはないの
で、高耐圧の回路部品を使用する必要がなく、しかも回
路構成も簡単になるため、回路コストが安価になり、ま
た高周波ノイズが小さくなり、さらに電圧Ｖ２が制御し
やすくなるので、放電が安定になる。また、電極４１に
電圧波形が矩形波の電圧Ｖ１ａを印加しているから、電
圧Ｖ１ａの立ち上がり、立ち下がりが早いので、電圧Ｖ
２を印加することにより輝度、効率の増加する効果がさ
らに大きくなる。In the method and apparatus for driving the discharge tube, the voltage V1a applied to the electrode 41 generates a discharge,
The formation is performed, and the discharge in which the voltage V2 applied to the electrode 42 is superimposed in the plasma in the discharge tube main body 12 is maintained,
The electron temperature approaches the preferred value for emitting visible or ultraviolet light. Therefore, even when driven at a low voltage of several hundred volts, the same luminance as when a high voltage of 1,000 volts or more is applied can be obtained, and a high-luminance, high-efficiency discharge device can be realized. Since high-frequency high voltage is not required, there is no need to use high-withstand voltage circuit components, and the circuit configuration is simplified, so that circuit cost is reduced and high-frequency noise is reduced. Further, since the voltage V2 is easily controlled, the discharge becomes stable. Further, since the voltage V1a having a rectangular waveform is applied to the electrode 41, the voltage V1a rises and falls quickly, so that the voltage V1a is high.
By applying 2, the effect of increasing the luminance and efficiency is further increased.
【００２０】図２は電圧Ｖ１ａの周波数が１００ｋＨ
ｚ、電圧値が６００Ｖ（ｐ−ｐ）であるときの電圧Ｖ２
の電圧値と輝度との関係を示したグラフであり、線ａ〜
ｄは電圧Ｖ２の周波数が２、６、１４、２６ＭＨｚの場
合を示す。このグラフから明らかなように、電圧Ｖ２の
電圧値が０Ｖのときには、電圧Ｖ１ａだけが印加された
放電であって輝度は低いが、電圧Ｖ２の電圧値、周波数
を高くすると、輝度は高くなる。そして、電圧Ｖ２の周
波数が２ＭＨｚでは、電圧Ｖ２の電圧値を高くしても輝
度はあまり増加しないが、電圧Ｖ２の周波数を２．５Ｍ
Ｈｚ以上にしたときには、電圧Ｖ１ａとともに電圧Ｖ２
を印加することによる効果が出てきて、大幅に輝度を高
くすることができた。この結果から、電圧Ｖ２の周波数
を２．５ＭＨｚ以上にするのが望ましい。FIG. 2 shows that the frequency of the voltage V1a is 100 kHz.
z, the voltage V2 when the voltage value is 600 V (pp)
5 is a graph showing the relationship between the voltage value and the brightness of the line a to b.
d shows the case where the frequency of the voltage V2 is 2, 6, 14, and 26 MHz. As is apparent from this graph, when the voltage value of the voltage V2 is 0 V, only the voltage V1a is applied and the luminance is low, but when the voltage value and the frequency of the voltage V2 are increased, the luminance increases. When the frequency of the voltage V2 is 2 MHz, the luminance does not increase much even if the voltage value of the voltage V2 is increased.
Hz or higher, the voltage V2a together with the voltage V1a
The effect obtained by applying was obtained, and the luminance could be greatly increased. From this result, it is desirable to set the frequency of the voltage V2 to 2.5 MHz or more.
【００２１】図３は電圧Ｖ１ａの周波数が１００ｋＨ
ｚ、電圧値が６００Ｖ（ｐ−ｐ）であり、電圧Ｖ２の電
圧値が１００Ｖ（ｐ−ｐ）であるときの電圧Ｖ２の周波
数ｆV2と輝度との関係を示したものである。このグラフ
から明らかなように、電圧Ｖ２の周波数ｆV2を高くする
に従って放電回数が増えるため、輝度はほぼ比例的に増
加する。しかし、周波数ｆV2が５０ＭＨｚを越えると、
輝度飽和現象が現れた。これは周波数ｆV2が高くなるに
従い電界リークが増加し、実効的な放電電圧が低下する
ためである。また、電磁波ノイズや回路構成が難しくな
るなどの問題も発生し、電圧Ｖ２の周波数ｆV2の範囲は
図２で示した結果と合わせて、２．５ＭＨｚから５０Ｍ
Ｈｚの間から選んだ周波数にするのが望ましい。また、
電圧Ｖ２の周波数ｆV2をたとえば１５ＭＨｚとしたとき
には、電圧Ｖ２を印加しないときに比べて４倍以上の輝
度が得られることがわかる。FIG. 3 shows that the frequency of the voltage V1a is 100 kHz.
z shows the relationship between the frequency fV2 of the voltage V2 and the luminance when the voltage value is 600 V (pp) and the voltage value of the voltage V2 is 100 V (pp). As is apparent from this graph, as the frequency f V2 of the voltage V2 increases, the number of discharges increases, so that the luminance increases almost proportionally. However, when the frequency f V2 exceeds 50 MHz,
The luminance saturation phenomenon appeared. This is because the electric field leakage increases as the frequency f V2 increases, and the effective discharge voltage decreases. In addition, problems such as electromagnetic noise and difficulty in circuit configuration also occur, and the range of the frequency f V2 of the voltage V2 is from 2.5 MHz to 50M in accordance with the results shown in FIG.
It is desirable to use a frequency selected from between Hz. Also,
It can be seen that when the frequency f V2 of the voltage V2 is set to, for example, 15 MHz, a luminance four times or more can be obtained as compared to when the voltage V2 is not applied.
【００２２】図４は電圧Ｖ１ａの周波数が１００ｋＨｚ
であるときの電圧Ｖ１ａの電圧値と輝度との関係を示し
たもので、線ａは電圧Ｖ１ａのみで放電させた場合を示
し、線ｂは電極４２に周波数８ＭＨｚ、電圧値１００Ｖ
の電圧Ｖ２を印加した場合を示す。このグラフから明ら
かなように、たとえば電圧Ｖ１ａの電圧値が６００Ｖの
ときには、電圧Ｖ２を印加することで輝度は２倍以上に
なる。また、最低放電維持電圧も５３０Ｖから４７５Ｖ
に低下することができ、輝度の変化範囲（調光範囲）を
広くできる効果もある。FIG. 4 shows that the frequency of the voltage V1a is 100 kHz.
Shows the relationship between the voltage value of the voltage V1a and the luminance when the voltage V1a is satisfied. The line a shows the case where the discharge is performed only with the voltage V1a, and the line b shows the frequency of 8 MHz at the electrode 42 and the voltage value of 100V.
The case where the voltage V2 of FIG. As is clear from this graph, for example, when the voltage value of the voltage V1a is 600 V, the luminance is more than doubled by applying the voltage V2. Also, the minimum discharge sustaining voltage is 530V to 475V.
This has the effect that the range of change in luminance (dimming range) can be widened.
【００２３】なお、電圧Ｖ１ａは放電の発生と維持を受
け持つため、電圧Ｖ２に比較して高い電圧で駆動する
が、電圧Ｖ１ａの周波数範囲としては、２ｋＨｚから１
ＭＨｚの間が望ましい。電圧Ｖ１ａの周波数が２ｋＨｚ
より低いと、放電回数が少なくなり過ぎて必要な輝度が
得られないことと、点灯のための電圧が非常に高くなる
ため、回路コストや安全性等が問題となり、本発明の利
点がなくなる。また、電圧Ｖ１ａの周波数が１ＭＨｚ以
上になると、上記した電界リークのために非常に高い電
圧を印加しないと放電の維持ができず、上記したと同じ
問題が発生する。さらに、放電装置の浮遊容量の充電、
放電に要する電力が大きくなり、回路効率が悪くなる問
題もある。The voltage V1a is driven at a higher voltage than the voltage V2 in order to generate and maintain the discharge, but the frequency range of the voltage V1a is 2 kHz to 1 kHz.
MHz is desirable. The frequency of the voltage V1a is 2 kHz
If it is lower, the required number of discharges is so small that the required luminance cannot be obtained, and the voltage for lighting becomes very high, so that the circuit cost and safety are problematic, and the advantages of the present invention are lost. Further, when the frequency of the voltage V1a is 1 MHz or more, the discharge cannot be maintained unless a very high voltage is applied due to the electric field leakage described above, and the same problem as described above occurs. Furthermore, charging of the stray capacitance of the discharging device,
There is also a problem that the power required for discharging increases and circuit efficiency deteriorates.
【００２４】図５は本発明に係る平板型光源の駆動方法
を実施するための装置、すなわち本発明に係る平板型光
源の駆動装置を示す概略図である。図に示すように、ソ
ーダガラスやセラミックス等からなる前面板２１と、ソ
ーダガラス等からなる透光性の絶縁基板２２と、ソーダ
ガラス等からなる側板２３とが、たとえば低融点ガラス
（図示せず）で一体に気密封着され、断面が偏平状の平
板型光源２０の密閉容器２７が構成されている。また、
絶縁基板２２に電極４３、４４が形成され、電極４３、
４４の全面は誘電体２４で覆われている。また、前面板
２１の内面には蛍光体２５が塗布され、蛍光体２５は放
電で発生した紫外線で励起発光する。また、密閉容器２
７内の放電空間２６はたとえば高さは３ｍｍで、大きさ
１１０ｍｍ×８５ｍｍ、対角約５．５インチの発光面を
有し、放電空間２６内には水銀と始動用ガスとしてアル
ゴンやネオンーアルゴン等の混合ガス、またはキセノ
ン、クリプトン、アルゴン、ヘリウム、ネオン等の希ガ
スの放電ガスが封入されている。また、電極４３に第１
の周波数を有しかつ電圧波形が矩形のパルス波（略矩形
のパルス波を含む）である第１の電圧Ｖ１ｂを発生する
第１の駆動電圧発生回路５１ｂが接続され、電極４４に
駆動電圧発生回路５２が接続されている。すなわち、本
発明に係る平板型光源の駆動方法においては、電極４３
に周波数が２ｋＨｚから１ＭＨｚの電圧Ｖ１ｂを印加
し、電極４４に周波数が２．５ＭＨｚから５０ＭＨｚの
電圧Ｖ２を印加する。FIG. 5 is a schematic diagram showing an apparatus for implementing the method of driving a flat light source according to the present invention, that is, a driving apparatus for a flat light source according to the present invention. As shown in the figure, a front plate 21 made of soda glass or ceramics, a translucent insulating substrate 22 made of soda glass or the like, and a side plate 23 made of soda glass or the like are made of, for example, low melting glass (not shown). ) To form a hermetically sealed container 27 of the flat light source 20 which is hermetically sealed and has a flat cross section. Also,
The electrodes 43 and 44 are formed on the insulating substrate 22, and the electrodes 43 and
The entire surface of 44 is covered with the dielectric 24. Further, a phosphor 25 is applied on the inner surface of the front plate 21, and the phosphor 25 emits and emits light by ultraviolet rays generated by the discharge. In addition, closed container 2
7, a discharge space 26 having a height of, for example, 3 mm, a size of 110 mm.times.85 mm, and a light emitting surface of about 5.5 inches diagonally. A discharge gas such as a mixed gas such as argon or a rare gas such as xenon, krypton, argon, helium, or neon is sealed. Also, the first electrode 43
And a first drive voltage generation circuit 51b that generates a first voltage V1b having a rectangular pulse wave (including a substantially rectangular pulse wave) having a frequency of .times. A circuit 52 is connected. That is, in the method for driving the flat light source according to the present invention, the electrode 43
And a voltage V1b having a frequency of 2.5 MHz to 50 MHz is applied to the electrode 44.
【００２５】この平板型光源の駆動方法、駆動装置にお
いても、上記したと同様の効果が得られ、高輝度、高効
率の平板型光源を得ることができる。また、電極４３に
電圧波形が矩形のパルス波の電圧Ｖ１ｂを印加している
から、電圧Ｖ１ｂの立ち上がり、立ち下がりが早いの
で、電圧Ｖ２を印加することにより輝度、効率の増加す
る効果がさらに大きくなる。In the method and apparatus for driving a flat light source, the same effects as described above can be obtained, and a high brightness and high efficiency flat light source can be obtained. In addition, since the voltage V1b of a rectangular pulse wave is applied to the electrode 43, the rise and fall of the voltage V1b are fast. Therefore, the effect of increasing the luminance and efficiency by applying the voltage V2 is further increased. Become.
【００２６】図６は本発明に係る冷陰極蛍光ランプの駆
動方法を実施するための装置、すなわち本発明に係る冷
陰極蛍光ランプの駆動装置を示す概略図である。図に示
すように、液晶表示装置等のバックライトに用いられて
いる冷陰極蛍光ランプ３０のランプ本体３１の内壁面に
は蛍光体が塗布され、冷陰極蛍光ランプ３０の電極４５
には第１の周波数を有しかつ電圧波形が正弦波である第
１の電圧Ｖ１ｃを発生する第１の駆動電圧発生回路５１
ｃが接続され、冷陰極蛍光ランプ３０の電極４６に駆動
電圧発生回路５２が接続されている。すなわち、本発明
に係る冷陰極蛍光ランプの駆動方法においては、電極４
５に電圧Ｖ１ｃを印加し、電極４６に電圧Ｖ２を印加す
る。なお、駆動電圧発生回路５１ｃとしては蛍光ランプ
等に通常用いられているインバータを用いてもよい。FIG. 6 is a schematic diagram showing an apparatus for carrying out the method for driving a cold cathode fluorescent lamp according to the present invention, that is, a driving apparatus for a cold cathode fluorescent lamp according to the present invention. As shown in the figure, a phosphor is applied to the inner wall surface of a lamp body 31 of a cold cathode fluorescent lamp 30 used for a backlight of a liquid crystal display device or the like, and an electrode 45 of the cold cathode fluorescent lamp 30 is applied.
A first drive voltage generation circuit 51 for generating a first voltage V1c having a first frequency and a voltage waveform of a sine wave
c, and the drive voltage generation circuit 52 is connected to the electrode 46 of the cold cathode fluorescent lamp 30. That is, in the method for driving a cold cathode fluorescent lamp according to the present invention, the electrode 4
5 and a voltage V2 is applied to the electrode 46. The drive voltage generation circuit 51c may be an inverter commonly used for a fluorescent lamp or the like.
【００２７】この内部電極型の放電装置である冷陰極蛍
光ランプの駆動方法、駆動装置においても、放電管１０
のような外部電極型の放電装置の駆動方法と同様の効果
が得られ、高輝度、高効率の冷陰極蛍光ランプ３０を得
ることができる。In the method and apparatus for driving a cold cathode fluorescent lamp, which is an internal electrode type discharge apparatus, the discharge tube 10 is also used.
The same effect as the method of driving the external electrode type discharge device described above can be obtained, and the high-intensity and high-efficiency cold cathode fluorescent lamp 30 can be obtained.
【００２８】図７は本発明に係る他の放電管の駆動方法
を実施するための装置、すなわち本発明に係る他の放電
管の駆動装置を示す概略図である。図に示すように、放
電管１１の放電管本体１３の外面に３つの電極４７〜４
９が設けられ、放電管本体１３の外径寸法は３ｍｍで、
放電管本体１３の内壁面には蛍光体が塗布され、放電管
本体１３内に水銀とＮｅ−Ａｒとが封入され、中央の電
極４８には駆動電圧発生回路５１ａが接続され、両側の
電極４７および電極４９には駆動電圧発生回路５２が接
続されている。すなわち、本発明に係る他の放電管の駆
動方法においては、電極４８に電圧Ｖ１ａを印加し、電
極４７、４９に電圧Ｖ２を印加する。FIG. 7 is a schematic diagram showing an apparatus for carrying out another method for driving a discharge tube according to the present invention, that is, another apparatus for driving a discharge tube according to the present invention. As shown in the figure, three electrodes 47 to 4 are provided on the outer surface of the discharge tube main body 13 of the discharge tube 11.
9, the outer diameter of the discharge tube body 13 is 3 mm,
A fluorescent substance is applied to the inner wall surface of the discharge tube main body 13, mercury and Ne-Ar are sealed in the discharge tube main body 13, a driving voltage generation circuit 51a is connected to the central electrode 48, and the electrodes 47 on both sides are connected. A drive voltage generating circuit 52 is connected to the electrode 49 and the electrode 49. That is, in another driving method of the discharge tube according to the present invention, the voltage V1a is applied to the electrode 48, and the voltage V2 is applied to the electrodes 47 and 49.
【００２９】この放電管の駆動方法、駆動装置において
は、液晶表示装置用のバックライト等に用いられる放電
管のように放電管本体１３の長さが長いときにも、低い
駆動電圧で高輝度、高効率な発光が得られる。また、低
電圧で駆動できるから、放電管の省電力化が可能にな
り、回路も安価にでき、ノイズの発生も少ない利点もあ
る。In the method and apparatus for driving a discharge tube, even when the length of the discharge tube main body 13 is long, such as a discharge tube used for a backlight for a liquid crystal display device, a high driving voltage and a high luminance can be obtained. And highly efficient light emission can be obtained. In addition, since the discharge tube can be driven at a low voltage, the power consumption of the discharge tube can be reduced, the circuit can be inexpensive, and there is an advantage that noise is less generated.
【００３０】図８は本発明に係る他の放電管の駆動方法
を実施するための装置、すなわち本発明に係る他の放電
管の駆動装置を示す概略図である。図に示すように、両
側の電極４７および電極４９には駆動電圧発生回路５１
ａが接続され、中央の電極４８には駆動電圧発生回路５
２が接続されている。すなわち、本発明に係る他の放電
管の駆動方法においては、電極４７、４９に電圧Ｖ１ａ
を印加し、電極４８に電圧Ｖ２を印加する。FIG. 8 is a schematic view showing an apparatus for carrying out another method for driving a discharge tube according to the present invention, that is, another apparatus for driving a discharge tube according to the present invention. As shown in the figure, a drive voltage generation circuit 51 is provided on both electrodes 47 and 49.
a is connected, and the driving voltage generating circuit 5
2 are connected. That is, in another driving method of the discharge tube according to the present invention, the voltage V1a is applied to the electrodes 47 and 49.
And a voltage V2 is applied to the electrode 48.
【００３１】この放電管の駆動方法、駆動装置において
は、図７に示した放電管の駆動方法、駆動装置と同じ効
果を有する。The method and apparatus for driving a discharge tube have the same effects as the method and apparatus for driving a discharge tube shown in FIG.
【００３２】図９は本発明に係る他の放電管の駆動方法
を実施するための装置、すなわち本発明に係る他の放電
管の駆動装置を示す概略図である。図に示すように、電
極４１に電圧Ｖ１ａと電圧Ｖ２とを交互に印加する第３
の駆動電圧発生回路５３が接続され、電極４２に電圧Ｖ
２と電圧Ｖ１ａとを交互に印加する第４の駆動電圧発生
回路５４が接続されている。すなわち、本発明に係る放
電管の駆動方法においては、電極４１に電圧Ｖ１ａと電
圧Ｖ２とを交互に印加し、電極４２に電圧Ｖ２と電圧Ｖ
１ａとを交互に印加する。たとえば、電極４１に印加す
る電圧を周期６０Ｈｚで電圧Ｖ１ａ−電圧Ｖ２−電圧Ｖ
１ａと切り替えるとともに、電極４２に印加する電圧を
周期６０Ｈｚで電圧Ｖ２−電圧Ｖ１ａ−電圧Ｖ２と切り
替える。すなわち、電極４１に電圧Ｖ１ａを印加してい
るとき、電極４２に電圧Ｖ２を印加し、電極４１に電圧
Ｖ２を印加しているとき、電極４２に電圧Ｖ１ａを印加
する。FIG. 9 is a schematic view showing an apparatus for carrying out another method for driving a discharge tube according to the present invention, that is, another apparatus for driving a discharge tube according to the present invention. As shown in the figure, a third voltage V1a and a voltage V2 are alternately applied to the electrode 41.
Is connected to the electrode 42 and a voltage V
4 and a fourth drive voltage generation circuit 54 for alternately applying the voltage V1a. That is, in the discharge tube driving method according to the present invention, the voltage V1a and the voltage V2 are alternately applied to the electrode 41, and the voltage V2 and the voltage V2 are applied to the electrode 42.
1a are applied alternately. For example, the voltage applied to the electrode 41 is a voltage V1a−voltage V2−voltage V at a cycle of 60 Hz.
While switching to 1a, the voltage applied to the electrode 42 is switched at a cycle of 60 Hz from voltage V2 to voltage V1a to voltage V2. That is, when the voltage V1a is applied to the electrode 41, the voltage V2 is applied to the electrode 42, and when the voltage V2 is applied to the electrode 41, the voltage V1a is applied to the electrode 42.
【００３３】この放電管の駆動方法、駆動装置において
は、放電管本体１２の長さや形状等にかかわらず発光の
ムラや、不均一が発生することがなく、高輝度、高効率
で均一な発光が得られる。In the method and the apparatus for driving the discharge tube, unevenness and unevenness of the light emission do not occur regardless of the length and shape of the discharge tube body 12, and the light emission is high in brightness and high in efficiency and uniform. Is obtained.
【００３４】図１０は本発明に係る他の放電管の駆動方
法を実施するための装置、すなわち本発明に係る放電管
の駆動装置を示す概略図である。図に示すように、電極
４８に駆動電圧発生回路５３が接続され、電極４７およ
び電極４９に駆動電圧発生回路５４が接続されている。
すなわち、本発明に係る放電管の駆動方法においては、
電極４８に電圧Ｖ１ａと電圧Ｖ２とを交互に印加し、電
極４７および電極４９に電圧Ｖ２と電圧Ｖ１ａとを交互
に印加する。たとえば、電極４８に印加する電圧を周期
６０Ｈｚで電圧Ｖ１ａ−電圧Ｖ２−電圧Ｖ１ａと切り替
えるとともに、電極４７および電極４９に印加する電圧
を周期６０Ｈｚで電圧Ｖ２−電圧Ｖ１ａ−電圧Ｖ２と切
り替える。FIG. 10 is a schematic view showing an apparatus for carrying out another method for driving a discharge tube according to the present invention, that is, a driving apparatus for a discharge tube according to the present invention. As shown in the figure, the drive voltage generation circuit 53 is connected to the electrode 48, and the drive voltage generation circuit 54 is connected to the electrodes 47 and 49.
That is, in the discharge tube driving method according to the present invention,
The voltage V1a and the voltage V2 are alternately applied to the electrode 48, and the voltage V2 and the voltage V1a are alternately applied to the electrode 47 and the electrode 49. For example, the voltage applied to the electrode 48 is switched between the voltage V1a and the voltage V2−the voltage V1a at a cycle of 60 Hz, and the voltage applied to the electrodes 47 and 49 is switched between the voltage V2 and the voltage V1a−the voltage V2 at a cycle of 60 Hz.
【００３５】この放電管の駆動方法、駆動装置において
も、放電管本体１３の長さや形状等にかかわらず発光の
ムラや、不均一が発生することがなく、高輝度、高効率
で均一な発光が得られる。In the method and the apparatus for driving the discharge tube, unevenness and unevenness of the light emission do not occur regardless of the length and the shape of the discharge tube body 13, and the uniform and high-brightness light emission is achieved. Is obtained.
【００３６】図１１は本発明に係る他の放電管の駆動方
法を実施するための装置、すなわち本発明に係る放電管
の駆動装置を示す概略図である。図に示すように、電極
４７に第１の周波数を有しかつ電圧波形が矩形波の第３
の電圧Ｖ３を発生する第５の駆動電圧発生回路５５が接
続され、電極４９に第１の周波数を有し、位相が電圧Ｖ
３と半周期ずれかつ電圧波形が矩形波の第４の電圧Ｖ４
を発生する第６の駆動電圧発生回路５６が接続され、電
極４８に駆動電圧発生回路５２が接続されている。すな
わち、本発明に係る放電管の駆動方法においては、電極
４７に電圧Ｖ３を印加し、電極４９に電圧Ｖ４を印加
し、電極４８に電圧Ｖ２を印加する。FIG. 11 is a schematic diagram showing an apparatus for carrying out another method for driving a discharge tube according to the present invention, that is, a driving apparatus for a discharge tube according to the present invention. As shown in the figure, the electrode 47 has the first frequency and the voltage waveform is the third rectangular wave.
A fifth drive voltage generation circuit 55 for generating a voltage V3 of the first voltage is connected to the electrode 49, the electrode 49 has a first frequency,
4. The fourth voltage V4 having a half-wave shift from 3 and a rectangular waveform.
And a drive voltage generation circuit 52 is connected to the electrode 48. That is, in the discharge tube driving method according to the present invention, the voltage V3 is applied to the electrode 47, the voltage V4 is applied to the electrode 49, and the voltage V2 is applied to the electrode 48.
【００３７】この放電管の駆動方法、駆動装置において
は、電極４７、４９に印加した電圧Ｖ３、Ｖ４により放
電の発生、形成が行なわれ、電極４８に印加した電圧Ｖ
２により放電管本体１３内のプラズマ中で重畳された放
電が維持され、その効果は上記した実施の形態と同じで
ある。In the method and apparatus for driving the discharge tube, the discharge is generated and formed by the voltages V3 and V4 applied to the electrodes 47 and 49, and the voltage V
2, the superimposed discharge is maintained in the plasma in the discharge tube body 13, and the effect is the same as in the above-described embodiment.
【００３８】また、照明装置において、上述の放電装置
の駆動方法、駆動装置により点灯させた放電装置を用い
て被照明体を照明するよう構成する。Further, in the lighting device, the object to be illuminated is illuminated by using the above-described method for driving the discharge device and the discharge device lit by the drive device.
【００３９】また、液晶表示装置において、上述の照明
装置を用いる。In the liquid crystal display device, the above-described lighting device is used.
【００４０】なお、上述実施の形態においては、放電装
置が放電管１０、１１、平板型光源２０、冷陰極蛍光ラ
ンプ３０の場合について説明したが、他の放電装置にも
本発明を適用することができる。また、上述実施の形態
においては、第１の電圧として電圧波形が矩形波の電圧
Ｖ１ａ、電圧波形が矩形のパルス波の電圧Ｖ１ｂ、電圧
波形が正弦波である電圧Ｖ１ｃを用いたが、第１の電圧
として電圧波形が三角波等のものを用いてもよい。ま
た、上述実施の形態においては、第３、第４の電圧とし
て電圧波形が矩形波の電圧Ｖ３、Ｖ４を用いたが、第
３、第４の電圧として電圧波形が矩形のパルス波、正弦
波、三角波等のものを用いてもよい。また、上述実施の
形態においては、第２の電圧として電圧値が一定の電圧
Ｖ２を用いたが、第２の電圧として電圧値が一定周期で
次第に減衰、増加するようなものを用いてもよい。In the above embodiment, the case where the discharge devices are the discharge tubes 10 and 11, the flat light source 20, and the cold cathode fluorescent lamp 30 has been described. However, the present invention can be applied to other discharge devices. Can be. In the above-described embodiment, the voltage V1a having a rectangular waveform, the voltage V1b having a rectangular pulse waveform, and the voltage V1c having a sine waveform are used as the first voltage. May have a voltage waveform such as a triangular wave. Further, in the above-described embodiment, the voltage waveforms V3 and V4 having rectangular waveforms are used as the third and fourth voltages. However, the pulse waveforms and sine waves having rectangular voltage waveforms are used as the third and fourth voltages. , A triangular wave or the like may be used. Further, in the above-described embodiment, the voltage V2 having a constant voltage value is used as the second voltage, but a voltage whose voltage value gradually attenuates and increases in a constant cycle may be used as the second voltage. .
【００４１】[0041]
【発明の効果】本発明に係る放電装置の駆動方法、駆動
装置、照明装置、液晶表示装置においては、電子温度が
可視光あるいは紫外光を放射するために好ましい値に近
づくから、高輝度、高効率の放電装置が実現でき、しか
も放電長が長くなったとしても高電圧が必要になること
はないから、高耐圧の回路部品を使用する必要がなく、
また回路構成も簡単になるので、回路コストが安価にな
り、また高周波ノイズが小さくなり、さらに第２の電圧
が制御しやすくなるので、放電が安定になる。In the driving method, the driving device, the illuminating device and the liquid crystal display device of the discharge device according to the present invention, since the electron temperature approaches a preferable value for emitting visible light or ultraviolet light, high brightness and high brightness can be obtained. Efficient discharge devices can be realized, and even if the discharge length is long, a high voltage is not required, so there is no need to use high voltage circuit components.
Further, since the circuit configuration is simplified, the circuit cost is reduced, high-frequency noise is reduced, and the second voltage is easily controlled, so that the discharge becomes stable.
【００４２】また、電極の少なくとも１つに第１の電圧
と第２の電圧とを交互に印加し、他の電極に第２の電圧
と第１の電圧とを交互に印加したときには、放電装置の
長さや形状等にかかわらず発光のムラや、不均一が発生
することがなく、高輝度、高効率で均一な発光が得られ
る。When the first voltage and the second voltage are alternately applied to at least one of the electrodes, and the second voltage and the first voltage are alternately applied to the other electrodes, the discharge device Irrespective of the length, shape, etc., unevenness and unevenness of light emission do not occur, and uniform light emission with high luminance, high efficiency, and the like can be obtained.
【００４３】また、第１の周波数を２ｋＨｚから１ＭＨ
ｚの間から選んだ周波数としたときには、必要な輝度が
得られ、しかも電界リークの発生がほとんどないから、
高い電圧を印加しなくとも放電を維持することができ
る。The first frequency is changed from 2 kHz to 1 MHz.
When the frequency is selected from between z, the required brightness can be obtained and the electric field leakage hardly occurs.
Discharge can be maintained without applying a high voltage.
【００４４】また、第２の周波数を２．５ＭＨｚから５
０ＭＨｚの間から選んだ周波数としたときには、大幅に
輝度を高くすることができる。Further, the second frequency is changed from 2.5 MHz to 5
When the frequency is selected from the range of 0 MHz, the luminance can be greatly increased.
【００４５】また、第１、第３、第４の電圧として電圧
波形が矩形波のものまたは電圧波形が矩形のパルス波の
ものを用いたときには、第１、第３、第４の電圧の立ち
上がり、立ち下がりが早いので、第２の電圧を印加する
ことにより輝度、効率の増加する効果がさらに大きくな
る。When the first, third, and fourth voltages have a rectangular waveform or a rectangular pulse waveform, the rising of the first, third, and fourth voltages is used. Since the falling speed is fast, the effect of increasing the luminance and efficiency by applying the second voltage is further increased.
【００４６】また、電極の少なくとも１つに第３の駆動
電圧発生回路を接続し、他の電極に第４の駆動電圧発生
回路を接続したときには、放電装置の長さや形状等にか
かわらず発光のムラや、不均一が発生することがなく、
高輝度、高効率で均一な発光が得られる。When a third drive voltage generation circuit is connected to at least one of the electrodes and a fourth drive voltage generation circuit is connected to the other electrodes, the light emission of the discharge device can be performed irrespective of the length and shape of the discharge device. No unevenness or unevenness occurs,
High luminance, high efficiency and uniform light emission can be obtained.
【図１】本発明に係る放電管の駆動方法を実施するため
の装置を示す概略図である。FIG. 1 is a schematic view showing an apparatus for carrying out a method for driving a discharge tube according to the present invention.
【図２】図１に示した装置の電圧Ｖ２の電圧値と輝度と
の関係を示すグラフである。FIG. 2 is a graph showing a relationship between a voltage value of a voltage V2 of the device shown in FIG. 1 and luminance.
【図３】図１に示した装置の電圧Ｖ２の周波数と輝度と
の関係を示すグラフである。FIG. 3 is a graph showing the relationship between the frequency of a voltage V2 and the luminance of the device shown in FIG.
【図４】図１に示した装置の電圧Ｖ１の電圧値と輝度と
の関係を示すグラフである。FIG. 4 is a graph showing a relationship between a voltage value of a voltage V1 of the device shown in FIG. 1 and luminance.
【図５】本発明に係る平板型光源の駆動方法を実施する
ための装置を示す概略図である。FIG. 5 is a schematic view showing an apparatus for implementing a method of driving a flat light source according to the present invention.
【図６】本発明に係る冷陰極蛍光ランプの駆動方法を実
施するための装置を示す概略図である。FIG. 6 is a schematic view showing an apparatus for implementing a method of driving a cold cathode fluorescent lamp according to the present invention.
【図７】本発明に係る他の放電管の駆動方法を実施する
ための装置を示す概略図である。FIG. 7 is a schematic view showing an apparatus for carrying out another method for driving a discharge tube according to the present invention.
【図８】本発明に係る他の放電管の駆動方法を実施する
ための装置を示す概略図である。FIG. 8 is a schematic view showing an apparatus for carrying out another method for driving a discharge tube according to the present invention.
【図９】本発明に係る他の放電管の駆動方法を実施する
ための装置を示す概略図である。FIG. 9 is a schematic view showing an apparatus for carrying out another driving method of a discharge tube according to the present invention.
【図１０】本発明に係る他の放電管の駆動方法を実施す
るための装置を示す概略図である。FIG. 10 is a schematic view showing an apparatus for implementing another method of driving a discharge tube according to the present invention.
【図１１】本発明に係る他の放電管の駆動方法を実施す
るための装置を示す概略図である。FIG. 11 is a schematic view showing an apparatus for carrying out another driving method of a discharge tube according to the present invention.
【図１２】従来の放電装置の駆動方法における駆動電圧
波形を示すグラフである。FIG. 12 is a graph showing a drive voltage waveform in a conventional method of driving a discharge device.
１０…放電管 １１…放電管 ２０…平板型光源 ３０…冷陰極蛍光ランプ ４１〜４９…電極 ５１ａ…第１の駆動電圧発生回路 ５１ｂ…第１の駆動電圧発生回路 ５１ｃ…第１の駆動電圧発生回路 ５２…第２の駆動電圧発生回路 ５３…第３の駆動電圧発生回路 ５４…第４の駆動電圧発生回路 ５５…第５の駆動電圧発生回路 ５６…第６の駆動電圧発生回路 DESCRIPTION OF SYMBOLS 10 ... Discharge tube 11 ... Discharge tube 20 ... Flat light source 30 ... Cold cathode fluorescent lamp 41-49 ... Electrode 51a ... 1st drive voltage generation circuit 51b ... 1st drive voltage generation circuit 51c ... 1st drive voltage generation Circuit 52: Second drive voltage generation circuit 53: Third drive voltage generation circuit 54: Fourth drive voltage generation circuit 55: Fifth drive voltage generation circuit 56: Sixth drive voltage generation circuit
Claims (12)
おいて、上記電極の少なくとも１つに第１の周波数を有
する第１の電圧を印加し、他の上記電極に上記第１の周
波数より高い第２の周波数を有する第２の電圧を印加す
ることを特徴とする放電装置の駆動方法。1. A method for driving a discharge device having a plurality of electrodes, wherein a first voltage having a first frequency is applied to at least one of the electrodes, and a voltage higher than the first frequency is applied to the other electrodes. A method for driving a discharge device, comprising applying a second voltage having a second frequency.
おいて、上記電極の少なくとも１つに第１の周波数を有
する第１の電圧と上記第１の周波数より高い第２の周波
数を有する第２の電圧とを交互に印加し、他の上記電極
に上記第２の電圧と上記第１の電圧とを交互に印加する
ことを特徴とする放電装置の駆動方法。2. A method for driving a discharge device having a plurality of electrodes, wherein at least one of the electrodes has a first voltage having a first frequency and a second voltage having a second frequency higher than the first frequency. And a method of driving the discharge device, wherein the second voltage and the first voltage are alternately applied to the other electrodes.
駆動方法において、上記電極の少なくとも１つに第１の
周波数を有する第３の電圧を印加し、他の上記電極に上
記第１の周波数を有しかつ位相が第３の電圧と半周期ず
れた第４の電圧を印加し、さらに他の上記電極に上記第
１の周波数より高い第２の周波数を有する第２の電圧を
印加することを特徴とする放電装置の駆動方法。3. A method of driving a discharge device having at least three electrodes, wherein a third voltage having a first frequency is applied to at least one of the electrodes, and the first frequency is applied to the other electrodes. Applying a fourth voltage having a phase shifted from the third voltage by a half cycle, and applying a second voltage having a second frequency higher than the first frequency to the other electrodes. A method for driving a discharge device.
特徴とする請求項１、２または３に記載の放電装置の駆
動方法。4. The method for driving a discharge device according to claim 1, wherein the electrode is provided outside a discharge space.
の間から選んだ周波数としたことを特徴とする請求項１
〜４のいずれかに記載の放電装置の駆動方法。5. The method according to claim 1, wherein the first frequency is 2 kHz to 1 MHz.
2. A frequency selected from the range:
5. The method for driving a discharge device according to any one of claims 1 to 4.
ＭＨｚの間から選んだ周波数としたことを特徴とする請
求項１〜５のいずれかに記載の放電装置の駆動方法。6. The second frequency is increased from 2.5 MHz to 50 MHz.
The method according to any one of claims 1 to 5, wherein the frequency is selected from the range of MHz.
形が矩形波のものまたは電圧波形が矩形のパルス波のも
のを用いたことを特徴とする請求項１〜６のいずれかに
記載の放電装置の駆動方法。7. The method according to claim 1, wherein the first, third and fourth voltages have a rectangular waveform or a rectangular pulse waveform. 3. The method for driving a discharge device according to claim 1.
おいて、上記電極の少なくとも１つに第１の周波数を有
する第１の電圧を印加する第１の駆動電圧発生回路を接
続し、他の上記電極に上記第１の周波数より高い第２の
周波数を有する第２の電圧を印加する第２の駆動電圧発
生回路を接続したことを特徴とする放電装置の駆動装
置。8. A driving device for a discharge device having a plurality of electrodes, wherein a first driving voltage generating circuit for applying a first voltage having a first frequency is connected to at least one of the electrodes, A driving device for a discharge device, wherein a second driving voltage generating circuit for applying a second voltage having a second frequency higher than the first frequency is connected to the electrode.
おいて、上記電極の少なくとも１つに第１の周波数を有
する第１の電圧と上記第１の周波数より高い第２の周波
数を有する第２の電圧とを交互に印加する第３の駆動電
圧発生回路を接続し、他の上記電極に上記第２の電圧と
上記第１の電圧とを交互に印加する第４の駆動電圧発生
回路を接続したことを特徴とする放電装置の駆動装置。9. A driving device for a discharge device having a plurality of electrodes, wherein at least one of the electrodes has a first voltage having a first frequency and a second voltage having a second frequency higher than the first frequency. And a fourth drive voltage generation circuit for alternately applying the second voltage and the first voltage to the other electrodes. A driving device for a discharge device, comprising:
の駆動装置において、上記電極の少なくとも１つに第１
の周波数を有する第３の電圧を印加する第５の駆動電圧
発生回路を接続し、他の上記電極に上記第１の周波数を
有しかつ位相が第３の電圧と半周期ずれた第４の電圧を
印加する第６の駆動電圧発生回路を接続し、さらに他の
上記電極に上記第１の周波数より高い第２の周波数を有
する第２の電圧を印加する第２の駆動電圧発生回路を接
続したことを特徴とする放電装置の駆動装置。10. A driving device for a discharge device having at least three electrodes, wherein at least one of the electrodes has a first electrode.
A fifth driving voltage generating circuit for applying a third voltage having a frequency of the fourth voltage is connected to the other electrode, and a fourth driving voltage having the first frequency and having a phase shifted from the third voltage by a half cycle. A sixth driving voltage generating circuit for applying a voltage is connected, and a second driving voltage generating circuit for applying a second voltage having a second frequency higher than the first frequency to the other electrode is connected. A driving device for a discharge device, comprising:
置の駆動方法により点灯させた放電装置を用いて被照明
体を照明するよう構成したことを特徴とする照明装置。11. An illuminating device configured to illuminate an object to be illuminated by using a discharge device lit by the method for driving a discharge device according to any one of claims 1 to 7.
とを特徴とする液晶表示装置。12. A liquid crystal display device using the lighting device according to claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18477097A JPH1131591A (en) | 1997-07-10 | 1997-07-10 | Method and device for driving discharge device, lighting system, and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18477097A JPH1131591A (en) | 1997-07-10 | 1997-07-10 | Method and device for driving discharge device, lighting system, and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1131591A true JPH1131591A (en) | 1999-02-02 |
Family
ID=16159020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18477097A Pending JPH1131591A (en) | 1997-07-10 | 1997-07-10 | Method and device for driving discharge device, lighting system, and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1131591A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100433804B1 (en) * | 2001-11-06 | 2004-06-04 | 주식회사 지엘디 | Device for driving the fluorescent lamp with external electrodes of LCD |
| US7218308B2 (en) | 2000-05-18 | 2007-05-15 | Hitachi, Ltd. | Liquid crystal display device having an improved backlight |
| WO2007129506A1 (en) * | 2006-05-09 | 2007-11-15 | Panasonic Corporation | Apparatus and method for lighting dielectric barrier discharge lamp |
| KR100927140B1 (en) | 2008-03-11 | 2009-11-18 | 재단법인서울대학교산학협력재단 | Mercury surface light source structure, its driving method, surface light source device driving method |
-
1997
- 1997-07-10 JP JP18477097A patent/JPH1131591A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7218308B2 (en) | 2000-05-18 | 2007-05-15 | Hitachi, Ltd. | Liquid crystal display device having an improved backlight |
| US7518594B2 (en) | 2000-05-18 | 2009-04-14 | Hitachi, Ltd. | Liquid crystal display device having an improved backlight |
| US7990361B2 (en) | 2000-05-18 | 2011-08-02 | Hitachi, Ltd. | Liquid crystal display device having an improved backlight |
| KR100433804B1 (en) * | 2001-11-06 | 2004-06-04 | 주식회사 지엘디 | Device for driving the fluorescent lamp with external electrodes of LCD |
| WO2007129506A1 (en) * | 2006-05-09 | 2007-11-15 | Panasonic Corporation | Apparatus and method for lighting dielectric barrier discharge lamp |
| KR100927140B1 (en) | 2008-03-11 | 2009-11-18 | 재단법인서울대학교산학협력재단 | Mercury surface light source structure, its driving method, surface light source device driving method |
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