JPH07175035A - Back light device - Google Patents
Back light deviceInfo
- Publication number
- JPH07175035A JPH07175035A JP5317219A JP31721993A JPH07175035A JP H07175035 A JPH07175035 A JP H07175035A JP 5317219 A JP5317219 A JP 5317219A JP 31721993 A JP31721993 A JP 31721993A JP H07175035 A JPH07175035 A JP H07175035A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- light source
- peltier element
- fluorescent tube
- backlight device
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示装置を照明す
る光源の温度を適正に制御するため加熱及び冷却が可能
な温度制御素子を備えたバックライト装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device having a temperature control element capable of heating and cooling in order to properly control the temperature of a light source for illuminating a liquid crystal display device.
【０００２】[0002]
【従来の技術】蛍光管を液晶表示装置のバックライト光
源として用いる場合、表示装置の周囲の温度上昇又は温
度下降と、蛍光管自身の発熱による表示装置の内部温度
変化とが相俟って蛍光管の温度が最適動作温度を外れて
しまうことがある。2. Description of the Related Art When a fluorescent tube is used as a light source for a backlight of a liquid crystal display device, a temperature increase or decrease around the display device and a change in internal temperature of the display device due to heat generation of the fluorescent tube are combined to cause a fluorescent light. The temperature of the tube may deviate from the optimum operating temperature.
【０００３】図５に蛍光管における温度と水銀放射強度
との関係を示す。横軸は水銀蒸気圧（Ｔｏｒｒ）を示
し、縦軸は共鳴線強度（％）を示す。この図から明らか
なように蛍光管の適温動作温度は４０℃近辺である。そ
して、蛍光管の温度が最適動作温度より外れた場合、輝
度は図６に示すように低下する。図６の横軸は周囲温
度、縦軸は輝度相対値を示す。そのため、従来は蛍光管
の温度が最適動作温度を外れないよう冷却のために、蛍
光管の周囲に放射板や放射フィン等を設けたり、放熱フ
ァンにより空冷している。FIG. 5 shows the relationship between temperature and mercury radiation intensity in a fluorescent tube. The horizontal axis represents mercury vapor pressure (Torr), and the vertical axis represents resonance line intensity (%). As is clear from this figure, the optimum operating temperature of the fluorescent tube is around 40 ° C. Then, when the temperature of the fluorescent tube deviates from the optimum operating temperature, the brightness decreases as shown in FIG. In FIG. 6, the horizontal axis represents the ambient temperature and the vertical axis represents the brightness relative value. Therefore, conventionally, in order to prevent the temperature of the fluorescent tube from deviating from the optimum operating temperature, a radiation plate, a radiation fin, or the like is provided around the fluorescent tube, or a cooling fan is used for air cooling.
【０００４】また、加熱のため加熱ヒーター等を設け熱
を加えている。In addition, a heating heater or the like is provided for heating to apply heat.
【０００５】その他、蛍光管にペルチェ素子を設けて、
ペルチェ素子により冷却を行う方法がある。In addition, by providing a Peltier element in the fluorescent tube,
There is a method of cooling with a Peltier element.
【０００６】その一例が特開平２−１８８５７号公報に
示されている。図７はその構成を示し、蛍光ランプ７１
の管側面にペルチェ素子７２が熱伝導コンパウンド７３
を介し熱的に結合されており、ペルチェ素子７２は、そ
の吸熱側７４を熱伝導コンパウンド７３に、加熱側７５
を反射板７６に接している。ペルチェ素子７２の最冷点
の部分に温度センサー７６が設けられてその部分の温度
を検出し、駆動制御回路７７に検出電圧として出力され
る。検出電圧は増幅回路７８を介して、比較回路７９に
おいて基準電圧器８０の出力電圧と比較され、その出力
によりペルチェ素子７２の駆動制御がなされ、最冷点温
度は所定温度以下に制御され、また所定温度以下となる
と停止し、輝度低下の防止を行う。An example thereof is shown in Japanese Patent Laid-Open No. 18857/1990. FIG. 7 shows the configuration of the fluorescent lamp 71.
The Peltier element 72 has a heat conduction compound 73 on the side of the pipe.
The Peltier element 72 has its heat absorbing side 74 connected to the heat conducting compound 73 and its heating side 75.
Is in contact with the reflection plate 76. A temperature sensor 76 is provided at the coldest point portion of the Peltier element 72, detects the temperature of the portion, and outputs it to the drive control circuit 77 as a detection voltage. The detected voltage is compared with the output voltage of the reference voltmeter 80 in the comparison circuit 79 through the amplifier circuit 78, and the output thereof controls the driving of the Peltier element 72, and the coldest point temperature is controlled to be equal to or lower than a predetermined temperature. When the temperature becomes equal to or lower than a predetermined temperature, the operation is stopped to prevent a decrease in brightness.
【０００７】[0007]
【発明が解決しようとする課題】上記実施例のペルチェ
素子利用は、高温環境下及び過冷却時に輝度低下の防止
のために、上記のように、ペルチェ素子の吸熱側を熱伝
導コンパウンドに接し、所定温度以上の場合に蛍光ラン
プの熱を吸収し、所定温度以下となると、停止するのみ
である。このため、 ａ．車載用部品等、広温度仕様が要求される場合におい
ては、所定温度以下の低温での温度環境下の使用におい
ては、ペルチェ素子機能の利用がなく、不合理である。The use of the Peltier element of the above-mentioned embodiment is as follows, in order to prevent the decrease in brightness under high temperature environment and supercooling, the heat absorption side of the Peltier element is in contact with the heat conduction compound, It absorbs the heat of the fluorescent lamp when the temperature is equal to or higher than the predetermined temperature, and only stops when the temperature becomes equal to or lower than the predetermined temperature. Therefore, a. In the case where a wide temperature specification such as an on-vehicle component is required, the Peltier element function is not utilized in the use in a temperature environment at a temperature lower than a predetermined temperature, which is unreasonable.
【０００８】ｂ．また、低温下での液晶表示装置使用時
の照明の輝度低下を防止し、短寿命化を防止するため、
加熱装置としてヒーターと組み合わせた場合、製品サイ
ズが大きくなり、コンパクト化への障害となる。B. Further, in order to prevent a decrease in the brightness of the illumination when using the liquid crystal display device at a low temperature and prevent a shortened life,
When combined with a heater as a heating device, the product size becomes large, which is an obstacle to downsizing.
【０００９】ｃ．さらに、平面ディスプレイの場合、バ
ックライト照明として、均一な輝度分布が要求され、蛍
光管の表面温度が局所にて冷却され、温度分布の偏りに
よる発光・輝度分布の偏りが発生する。本発明は上記の
欠点を除くために考えたものである。C. Further, in the case of a flat panel display, a uniform luminance distribution is required as backlight illumination, the surface temperature of the fluorescent tube is locally cooled, and a deviation in light emission / luminance distribution occurs due to a deviation in temperature distribution. The present invention is intended to eliminate the above drawbacks.
【００１０】[0010]
【課題を解決するための手段】本発明は、液晶表示装置
の後方、あるいは側面より照明する蛍光管、ＥＬ、発光
ダイオード等の光源に、加熱及び冷却が可能な温度制御
素子として例えばペルチェ素子を用い、この温度制御素
子を光源の反射板側、あるいは裏面側に、また光源側面
全体に熱が伝導するように接触固定してなる。そして、
上記光源に温度センサーを設置して光源の温度を検出す
るとともに、温度センサーの出力と設定温度と比較を行
い、温度制御素子へ環境温度に対応した電源供給または
その切り替えを行う駆動制御回路を備え、温度制御素子
の入力電圧の切り替えにより各環境温度下での吸熱、停
止、発熱を行うものである。According to the present invention, a light source such as a fluorescent tube, an EL, or a light emitting diode that illuminates from the rear or side of a liquid crystal display device is provided with a Peltier element as a temperature control element capable of heating and cooling. The temperature control element is used in contact with and fixed to the reflector side or the back side of the light source so that heat can be conducted to the entire side surface of the light source. And
A temperature sensor is installed in the light source to detect the temperature of the light source, and a drive control circuit that compares the output of the temperature sensor with the set temperature and supplies power to the temperature control element according to the ambient temperature or switches it The heat absorption, the stop, and the heat generation are performed under each environmental temperature by switching the input voltage of the temperature control element.
【００１１】また、本発明は光源の主電源ＯＮと同時
に、光源温度を上記温度制御素子により周囲温度から光
源の適温に設定する制御回路を有している。Further, the present invention has a control circuit for setting the light source temperature from the ambient temperature to an appropriate temperature of the light source at the same time when the main power source of the light source is turned on.
【００１２】[0012]
【作用】蛍光ランプの輝度は、管壁の温度により図６に
示すように変化するが、ＥＬや発光ダイオードも蛍光ラ
ンプの温度特性は異なるが、温度により輝度が変化する
ので、管壁又はＥＬ、発光ダイオードに近接して設置し
た温度センサーにより光源の温度を検出し、光源温度が
設定温度上限値を越える高温環境下の場合、制御回路よ
り温度制御素子としてのペルチェ素子の光源側側面が吸
熱として駆動する電流がペルチェ素子に流れ、蛍光管を
冷却することで、高温での輝度低下を防止できる。The brightness of the fluorescent lamp changes as shown in FIG. 6 depending on the temperature of the tube wall, but the EL and the light emitting diode also have different temperature characteristics of the fluorescent lamp, but the brightness changes depending on the temperature. When the temperature of the light source is detected by the temperature sensor installed close to the light emitting diode and the temperature of the light source exceeds the set temperature upper limit under high temperature environment, the control circuit absorbs heat from the side of the Peltier element as the temperature control element on the light source side. As a result, the current driven as Peltier element flows into the Peltier element to cool the fluorescent tube, so that it is possible to prevent the brightness from decreasing at a high temperature.
【００１３】管壁又はＥＬ、発光ダイオードに近接して
設置した温度センサーにより設定値温度上限値より低く
なったことを検出したとき、制御回路からの電源供給が
止まり、ペルチェ素子の駆動が停止することで、蛍光管
のそれ以上の冷却が止まる。When it is detected by the temperature sensor installed near the tube wall or EL or the light emitting diode that the temperature becomes lower than the set temperature upper limit value, the power supply from the control circuit is stopped and the driving of the Peltier element is stopped. This stops further cooling of the fluorescent tube.
【００１４】また、低温環境下の場合、管壁又はＥＬ、
発光ダイオードに近接して設置した温度センサー温度が
設定値下限値より低くなったことを検出したとき、制御
回路よりペルチェ素子の蛍光管側側面が放熱として駆動
する電流、つまり吸熱時の電流方向と反対の電流がペル
チェ素子に流れ、蛍光管を加熱することで、低温での放
電開始、及び点灯時の輝度低下を防止できる。In a low temperature environment, the pipe wall or EL,
When the temperature sensor installed close to the light emitting diode detects that the temperature is lower than the lower limit value of the set value, the control circuit causes the side of the Peltier element on the fluorescent tube side to drive as heat dissipation, that is, the current direction when absorbing heat. By flowing the opposite current to the Peltier element and heating the fluorescent tube, it is possible to prevent the discharge from starting at a low temperature and the decrease in brightness at the time of lighting.
【００１５】さらに、管壁又はＥＬ、発光ダイオードに
近接して設置した温度センサー温度が設定値下限値より
高くなったことを検出したとき、制御回路からの電源供
給が止まり、ペルチェ素子の駆動が停止し、蛍光管のそ
れ以上の加熱が止まる。Further, when it is detected that the temperature of the temperature sensor installed near the tube wall or EL or the light emitting diode becomes higher than the lower limit value of the set value, the power supply from the control circuit is stopped and the Peltier element is driven. It will stop and further heating of the fluorescent tube will stop.
【００１６】[0016]
【実施例】図１は本発明の一実施例を示し、図１は蛍光
管１０、反射板１１、ペルチェ素子１２、温度センサー
１３、駆動制御回路１４、蛍光管駆動回路１５を備え
る。1 shows an embodiment of the present invention. FIG. 1 includes a fluorescent tube 10, a reflecting plate 11, a Peltier element 12, a temperature sensor 13, a drive control circuit 14, and a fluorescent tube drive circuit 15.
【００１７】図２に示すように、蛍光管１０はＷ字型蛍
光管等のランプで、ランプ駆動回路により点灯駆動され
る。反射板１１は熱伝導に優れた材料（アルミニゥム、
銅、その他金属材料）により形成され、吸熱、放熱時の
熱対策用の機能を兼ね、また電磁放射のシールド作用と
して機能し、蛍光管１０と対向して配される。As shown in FIG. 2, the fluorescent tube 10 is a lamp such as a W-shaped fluorescent tube, which is driven by a lamp drive circuit. The reflector 11 is made of a material having excellent heat conduction (aluminum,
It is formed of copper or other metal material, has a function of absorbing heat and a measure against heat at the time of heat dissipation, and also functions as a shield function of electromagnetic radiation, and is arranged so as to face the fluorescent tube 10.
【００１８】ペルチェ素子１２は、蛍光管１０と直接、
あるいは熱伝導コンパウンド１６を挟みこむように結合
され、さらに物理的に耐熱性樹脂（図示しない）により
固定される。The Peltier element 12 is directly connected to the fluorescent tube 10.
Alternatively, the heat conductive compound 16 is bonded so as to sandwich it, and is further physically fixed by a heat resistant resin (not shown).
【００１９】駆動制御回路１４は、温度センサー１３の
出力に基づいて、測定温度が設定温度範囲内になるよう
にペルチェ素子１２の駆動制御する回路で、設定温度は
蛍光管の最適動作温度、あるいはその周辺温度、例えば
４０℃にされる。The drive control circuit 14 is a circuit for controlling the drive of the Peltier element 12 so that the measured temperature falls within the set temperature range based on the output of the temperature sensor 13, and the set temperature is the optimum operating temperature of the fluorescent tube, or The ambient temperature is set to, for example, 40 ° C.
【００２０】駆動制御回路１４は、例えば１５ｖ、−１
５ｖの直流電圧が得られる直流電源１７と、この直流電
源１７からの直流電圧をペルチェ素子１２に適合した電
圧、例えば８ｖ、あるいは−８ｖの直流電圧に変換し、
ペルチェ素子１２に供給する駆動回路１８と、温度セン
サー１３の出力を増幅し比較する増幅回路１９、比較回
路２０と、タイマー回路より構成される。駆動制御回路
１４の詳細は図３に示す通りであり、図１と同一の構成
部分に同一符号を付している。The drive control circuit 14 is, for example, 15v, -1.
A DC power supply 17 capable of obtaining a DC voltage of 5v and a DC voltage from the DC power supply 17 are converted to a voltage suitable for the Peltier element 12, for example, a DC voltage of 8v or -8v,
It is composed of a drive circuit 18 which supplies the Peltier element 12, an amplifier circuit 19 which amplifies and compares the output of the temperature sensor 13, a comparison circuit 20, and a timer circuit. Details of the drive control circuit 14 are as shown in FIG. 3, and the same components as those in FIG. 1 are designated by the same reference numerals.
【００２１】上記の装置において、蛍光管１０の周囲温
度が低いとき、又は蛍光管１０の点灯開始時などで蛍光
管自身の発熱が低いときのように、温度センサー１３で
の検出温度が上記の所定温度範囲以下であるとき、検出
電圧Ｖｄは基準電圧Ｖ１以下となり、ペルチェ素子１２
へは蛍光管側の側面が加熱機能となる駆動電圧が加えら
れ、ペルチェ素子１２の加熱により蛍光管１０が加熱さ
れる。ペルチェ素子１２による加熱と蛍光管自身の発熱
により、温度センサー１３での温度が所定温度範囲内に
達したとき、検出電圧Ｖｄは、基準電圧Ｖ１以上とな
り、ペルチェ素子１２への電源供給が停止し、駆動が止
まることでペルチェ素子による加熱がなくなる。従っ
て、低温環境下における輝度の低下を防止できる。In the above apparatus, the temperature detected by the temperature sensor 13 is the above when the ambient temperature of the fluorescent tube 10 is low, or when the temperature of the fluorescent tube 10 is low, such as when the fluorescent tube 10 is turned on. When the temperature is within the predetermined temperature range, the detection voltage Vd becomes the reference voltage V1 or less, and the Peltier element 12
A driving voltage for heating the side surface of the fluorescent tube side to serve as a heating function is applied to, and the fluorescent tube 10 is heated by heating the Peltier element 12. When the temperature of the temperature sensor 13 reaches within a predetermined temperature range due to the heating by the Peltier element 12 and the heat generation of the fluorescent tube itself, the detection voltage Vd becomes equal to or higher than the reference voltage V1, and the power supply to the Peltier element 12 is stopped. , When the driving is stopped, heating by the Peltier element is lost. Therefore, it is possible to prevent a decrease in brightness in a low temperature environment.
【００２２】蛍光管の周囲温度が所定温度範囲以内にあ
る場合、又は蛍光管１０の点灯開始時などでは、蛍光管
自身の発熱が低いため、温度センサー１３での温度が上
記の所定温度範囲内である場合、検出電圧Ｖｄが基準電
圧Ｖ１以上で且つ基準電圧Ｖｈ以下となり、ペルチェ素
子１３へは駆動制御回路１４からの電源供給がなく、ペ
ルチェ素子１２は駆動せず、蛍光管１０への過熱、冷却
は行われない。When the ambient temperature of the fluorescent tube is within the predetermined temperature range, or when the fluorescent tube 10 is turned on, the heat generated by the fluorescent tube itself is low, so the temperature at the temperature sensor 13 is within the above predetermined temperature range. If the detected voltage Vd is equal to or higher than the reference voltage V1 and equal to or lower than the reference voltage Vh, no power is supplied from the drive control circuit 14 to the Peltier element 13, the Peltier element 12 is not driven, and the fluorescent tube 10 is overheated. , No cooling is done.
【００２３】蛍光管の周囲温度が高い場合、又は蛍光管
１０の点灯開始時なども含め、蛍光管自身の発熱とも相
俟って、温度センサー１３での温度が上記の所定温度範
囲を越えた場合、検出電圧Ｖｄが基準電圧Ｖｈを越える
ことにより、ペルチェ素子１２へは蛍光管側の側面が吸
熱機能となる駆動電圧が加えられ、ペルチェ素子１２の
吸熱により蛍光管１０が冷却される。When the ambient temperature of the fluorescent tube is high, or when the fluorescent tube 10 is turned on, the temperature at the temperature sensor 13 exceeds the predetermined temperature range in combination with the heat generation of the fluorescent tube itself. In this case, when the detected voltage Vd exceeds the reference voltage Vh, a driving voltage is applied to the Peltier element 12 so that the side surface on the fluorescent tube side has an endothermic function, and the fluorescent tube 10 is cooled by the heat absorption of the Peltier element 12.
【００２４】ペルチェ素子１２による熱と蛍光管自身の
発熱により、温度センサー１３での温度が所定温度範囲
内に到達したとき、検出電圧Ｖｄは基準電圧Ｖｈ以下と
なり、ペルチェ素子１２への電源供給が停止し、駆動が
止まることでペルチェ素子１２による冷却がなくなる。
従って、高温環境下での輝度低下を防止できる。When the temperature at the temperature sensor 13 reaches within a predetermined temperature range due to the heat generated by the Peltier element 12 and the heat generated by the fluorescent tube itself, the detected voltage Vd becomes equal to or lower than the reference voltage Vh, and the power is supplied to the Peltier element 12. When the Peltier element 12 is stopped and the driving is stopped, cooling by the Peltier element 12 is lost.
Therefore, it is possible to prevent a decrease in brightness in a high temperature environment.
【００２５】[0025]
【発明の効果】上述のように、本発明によれば、図４に
示すように−４０℃〜＋８０℃までの高温環境下、低温
環境下のそれぞれにおいても輝度相対値をほぼ一定に保
つことができ、バックライト装置の使用温度範囲を広げ
ることが可能となることに加え、輝度の低下を防止で
き、且つ過冷却、過熱による輝度低下も防止できる。As described above, according to the present invention, as shown in FIG. 4, the brightness relative value is kept substantially constant under high temperature environment of −40 ° C. to + 80 ° C. and low temperature environment. In addition to being able to widen the operating temperature range of the backlight device, it is possible to prevent a decrease in brightness and also prevent a decrease in brightness due to overcooling or overheating.
【００２６】また、ペルチェ素子は冷却と加熱の双方の
機能を有し、加熱用ヒーター、冷却用のファン等大掛か
りとなる装置が必要でなく、同一機能のバックライトシ
ステムをさらに薄型、軽量、コンパクト化が可能にな
る。Further, the Peltier element has both cooling and heating functions, and does not require a large-scale device such as a heater for heating or a fan for cooling, and a backlight system having the same function can be made thinner, lighter and more compact. Becomes possible.
【００２７】またペルチェ素子の配置を上述のようにす
ることで、蛍光管を均一に加熱、冷却することができ、
蛍光管の温度分布を均一に保つことで、平面光源として
利用する場合に要求される蛍光管の発光輝度分布を均一
にすることができる。By disposing the Peltier element as described above, the fluorescent tube can be uniformly heated and cooled,
By keeping the temperature distribution of the fluorescent tube uniform, the emission brightness distribution of the fluorescent tube required when used as a flat light source can be made uniform.
【００２８】さらに低温環境下での過熱により、低温下
での短寿命化を回避でき、また、蛍光管の点灯開始より
発光輝度のアップ、安定化を早くすることができる。Further, it is possible to avoid shortening the life of the fluorescent lamp due to overheating in a low temperature environment, and it is possible to increase the emission brightness and stabilize the fluorescent lamp more quickly than the start of lighting the fluorescent tube.
【図１】本発明の一実施例のバックライト装置の構成図
を示す。FIG. 1 is a configuration diagram of a backlight device according to an embodiment of the present invention.
【図２】本発明の一実施例における蛍光管とペルチェ素
子と反射板の関係図を示す。FIG. 2 shows a relationship diagram of a fluorescent tube, a Peltier element, and a reflector in an embodiment of the present invention.
【図３】本発明の一実施例の駆動制御回路の詳細な回路
図を示す。FIG. 3 is a detailed circuit diagram of a drive control circuit according to an embodiment of the present invention.
【図４】本発明の一実施例による周囲温度と輝度相対値
との関係図を示す。FIG. 4 is a diagram showing a relationship between ambient temperature and relative luminance value according to an embodiment of the present invention.
【図５】水銀蒸気圧と共鳴線強度との関係図を示す。FIG. 5 shows a relationship diagram between mercury vapor pressure and resonance line intensity.
【図６】図５の特性の場合の周囲温度と輝度相対値との
関係図を示す。FIG. 6 is a diagram showing the relationship between the ambient temperature and the brightness relative value in the case of the characteristics shown in FIG.
【図７】従来例の構成図を示す。FIG. 7 shows a configuration diagram of a conventional example.
１０ 蛍光管 １１ 放熱・シールド反射板 １２ ペルチェ素子 １３ 温度センサー １４ 駆動制御回路 １５ ランプ駆動回路 １６ 熱伝導性接着剤 １７ 直流電源 １８ 駆動回路 １９ 増幅回路 ２０ 比較回路 10 Fluorescent Tube 11 Heat Dissipation / Shield Reflector 12 Peltier Element 13 Temperature Sensor 14 Drive Control Circuit 15 Lamp Drive Circuit 16 Heat Conductive Adhesive 17 DC Power Supply 18 Drive Circuit 19 Amplification Circuit 20 Comparison Circuit
Claims (7)
照明する蛍光管、ＥＬ、発光ダイオード等の光源に、加
熱及び冷却が可能な温度制御素子を光源の反射板側、あ
るいは裏面側に接触固定あるいは熱的に結合してなるバ
ックライト装置。1. A light source such as a fluorescent tube, an EL, or a light emitting diode that illuminates from the rear or side of a liquid crystal display device, and a temperature control element capable of heating and cooling is fixed in contact with the reflector side or the back side of the light source. Alternatively, a backlight device that is thermally coupled.
ことを特徴とする請求項１記載のバックライト装置。2. The backlight device according to claim 1, wherein the temperature control element is a Peltier element.
て光源の温度を検出することを特徴とする請求項１記載
のバックライト装置。3. The backlight device according to claim 1, wherein a temperature sensor is installed near the light source to detect the temperature of the light source.
較を行い、上記温度制御素子に環境温度に対応した電源
供給またはその切り替えを行う駆動制御回路を備えるこ
とを特徴とする請求項１記載のバックライト装置。4. The drive control circuit according to claim 1, further comprising: a drive control circuit that compares the output of the temperature sensor with a set temperature and supplies power to the temperature control element or switches the power supply in accordance with the ambient temperature. Backlight device.
により各環境温度下での吸熱、停止、発熱を行うことを
特徴とする請求項１記載のバックライト装置。5. The backlight device according to claim 1, wherein heat absorption, stoppage, and heat generation are performed under each environmental temperature by switching the input voltage of the temperature control element.
度を上記温度制御素子により周囲温度から光源の適温に
設定する制御回路を有する請求項１記載のバックライト
装置。6. The backlight device according to claim 1, further comprising a control circuit for setting the temperature of the light source from the ambient temperature to an appropriate temperature of the light source at the same time when the main power source of the light source is turned on.
ルド板を有する請求項１記載のバックライト装置。7. The backlight device according to claim 1, further comprising a reflection shield plate that radiates heat from the temperature control element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5317219A JPH07175035A (en) | 1993-12-17 | 1993-12-17 | Back light device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5317219A JPH07175035A (en) | 1993-12-17 | 1993-12-17 | Back light device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07175035A true JPH07175035A (en) | 1995-07-14 |
Family
ID=18085809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5317219A Pending JPH07175035A (en) | 1993-12-17 | 1993-12-17 | Back light device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07175035A (en) |
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