JPH07175035A - Back light device - Google Patents

Back light device

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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
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JP
Japan
Prior art keywords
temperature
light source
peltier element
heating
fluorescent tube
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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
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JP5317219A
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Japanese (ja)
Inventor
Hirokazu Nakase
浩和 中瀬
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Sharp Corp
シャープ株式会社
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Application filed by Sharp Corp, シャープ株式会社 filed Critical Sharp Corp
Priority to JP5317219A priority Critical patent/JPH07175035A/en
Publication of JPH07175035A publication Critical patent/JPH07175035A/en
Application status is Pending legal-status Critical

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Abstract

PURPOSE: To miniaturize a back light device which eliminates brightness change according to a temp. change of a back light device to be used for a liquid crystal display device.
CONSTITUTION: A Peltier element 12 is fixed or thermally coupled to a light source 10 in contact therewith. The temp. of the light source 10 is maintained nearly constant by supplying an electric current for driving for heating or cooling according to the output of a temp. sensor 13 to this Peltier element 12. As a result, nearly specified luminance is obtd. over temps. over a wide range of -40 to +80°C, and the degradation in the luminance is prevented. Since the Peltier element 12 functions for both effects of heating and cooling, the need for a heater for heating and fins for cooling is eliminated and the formation of the thin, light and compact back light device is made possible.
COPYRIGHT: (C)1995,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【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。 The present invention relates to relates to a backlight device provided with a temperature control device capable of heating and cooling to properly control the temperature of the light source illuminating the 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。 When using the Related Art Fluorescent tubes as a backlight source of a liquid crystal display device, a temperature rise or temperature drop of the periphery of the display device, fluorescent What internal temperature change and is coupled with a display device due to heat generation of the fluorescent tube itself it is the temperature of the tube deviates 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。 [0003] shows the relationship between the temperature and the mercury radiation intensity in the fluorescent tube in FIG. 横軸は水銀蒸気圧(Torr)を示し、縦軸は共鳴線強度(%)を示す。 The horizontal axis indicates the mercury vapor pressure (Torr), the vertical axis represents the resonance line intensity (%). 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。 Suitable temperature operating temperature of the fluorescent tube as is clear from this figure is around 40 ° C.. 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。 When the temperature of the fluorescent tube is out than the optimum operating temperature, the luminance decreases as shown in FIG. 図6の横軸は周囲温度、縦軸は輝度相対値を示す。 The horizontal axis in FIG. 6 is the ambient temperature, and the vertical axis shows a luminance relative value. 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。 Therefore, conventionally, for cooling so that the temperature of the fluorescent tube does not come off the optimum operating temperature, or provided with a radiation plate and a radiation fin or the like around the fluorescent tube, and cooled by cooling fan.

【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。 [0004] Also, applying heat provided with a heating heater or the like for heating.

【0005】その他、蛍光管にペルチェ素子を設けて、 [0005] Other and a Peltier element provided in the fluorescent tube,
ペルチェ素子により冷却を行う方法がある。 A method of performing cooling by the Peltier element.

【0006】その一例が特開平2−18857号公報に示されている。 [0006] An example is shown in Japanese Patent Laid-Open No. 2-18857. 図7はその構成を示し、蛍光ランプ71 Figure 7 shows the structure, the fluorescent lamp 71
の管側面にペルチェ素子72が熱伝導コンパウンド73 Peltier element 72 to the tube side heat transfer compound 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 It is thermally coupled via a Peltier device 72, the heat absorption side 74 to the heat conduction compound 73, heated side 75
を反射板76に接している。 In contact with the reflecting plate 76 a. 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。 The temperature sensor 76 is provided in a portion of the coldest point of the Peltier element 72 to detect the temperature of that portion is outputted as a detection voltage to the drive control circuit 77. 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。 Detection voltage via an amplifier circuit 78, is compared with the output voltage of the reference voltage 80. In the comparison circuit 79, the drive control of the Peltier device 72 is performed by the output, the cold spot temperature is controlled below a predetermined temperature and It stops when a predetermined temperature or less, perform prevention of luminance reduction.

【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。 Peltier device utilizing the above embodiments [0005], for the prevention of luminance reduction at a high temperature environment and supercooling, as described above, contact the heat absorbing side of the Peltier element to heat conduction compound, It absorbs heat of the fluorescent lamps in the case of more than the predetermined temperature, when a predetermined temperature or lower, is only stopped. このため、 a. For this reason, 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。 Automotive parts and the like, in the case where wide temperature specifications is required, in the use of a temperature environment at temperatures below a predetermined temperature, without the use of Peltier device function, it is unreasonable.

【0008】b. [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、 Further, since the preventing reduction in luminance of the liquid crystal display device illumination when used at low temperatures, to prevent life shortening,
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。 When combined with a heater as a heating device, product size increases, the failure to compact.

【0009】c. [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。 Furthermore, in the case of a flat display, as a backlight illumination, uniform luminance distribution is required, the surface temperature of the fluorescent tube is cooled by topical, deviation of light emission and the luminance distribution by uneven temperature distribution occurs. 本発明は上記の欠点を除くために考えたものである。 The present invention has been contemplated 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。 The present invention SUMMARY OF THE INVENTION, the rear side of the liquid crystal display device or a fluorescent tube for illuminating the side surface,, EL, the light source such as a light emitting diode, for example a Peltier element as a temperature control device capable of heating and cooling using, the temperature control element reflecting plate side of the light source, or on the back side, also heat formed by the contact fixing to conduct the entire light source side. そして、 And,
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。 It detects the temperature of the light source by installing a temperature sensor in the light source, and compare output of the temperature sensor and the set temperature, a drive control circuit for the power supply or a switching corresponding to the environmental temperature to the temperature control element and performs heat absorbing under the environmental temperature by switching the input voltage of the temperature control device, stop the heating.

【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 is at the same time as the main power ON of the light source and the light source temperature and a control circuit for setting an appropriate temperature of the light source from ambient temperature by the temperature control device.

【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。 [Action] of the fluorescent lamp brightness will vary with the tube wall temperature, as shown in FIG. 6, also EL or light-emitting diode the temperature characteristics of the fluorescent lamp is different, since the luminance varies with temperature, tube wall or EL , the temperature of the light source is detected by a temperature sensor installed in close proximity to the light emitting diode, when a high-temperature environment in which the light source temperature exceeds the set temperature upper limit, the light source side surface of the Peltier element as a temperature control element from the control circuit is endothermic current driving flows through the Peltier element as, by cooling the fluorescent tube, it is possible to prevent luminance lowering at high temperatures.

【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。 [0013] wall or EL, when it is detected that the temperature sensor installed in close proximity to the light emitting diode becomes lower than the set point temperature upper limit, stops the power supply from the control circuit, the driving of the Peltier element is stopped it is, it stops further cooling of the fluorescent tube.

【0014】また、低温環境下の場合、管壁又はEL、 [0014] In addition, in the case of a low-temperature environment, the tube wall or 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。 When the temperature sensor temperature was installed close to the light emitting diode is detected that is lower than the low limit value, the current fluorescent tube side surface of the Peltier element from the control circuit drives a radiator, i.e. the current direction at the time of heat absorption opposite current flows through the Peltier element to heat the fluorescent tubes, discharge starting at a low temperature, and the luminance reduction at the time of lighting can be prevented.

【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。 Furthermore, wall or EL, when the temperature sensor temperature was installed close to the light emitting diode is detected that is higher than the set value lower limit, it stops the power supply from the control circuit, the driving of the Peltier element stop, stop any further heating of the fluorescent tube.

【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。 DETAILED DESCRIPTION FIG. 1 shows an embodiment of the present invention, FIG. 1 includes a fluorescent tube 10, a reflector 11, Peltier device 12, the temperature sensor 13, the drive control circuit 14, a fluorescent tube driving 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。 As shown in FIG. 2, the fluorescent tube 10 in the lamp, such as a W-shaped fluorescent tubes are turned on and driven by a lamp drive circuit. 反射板11は熱伝導に優れた材料(アルミニゥム、 Reflector 11 has good thermal conductive material (Aruminiumu,
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。 Copper, is formed by other metal materials), heat absorption, also functions for thermal management of heat radiation, also serves as a shield effect of the electromagnetic radiation, disposed to face the fluorescent tube 10.

【0018】ペルチェ素子12は、蛍光管10と直接、 The Peltier element 12 is directly the fluorescent tube 10,
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。 Or coupled to sandwich the heat-conducting compound 16 is fixed by further physical 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 based on the output of the temperature sensor 13, in the circuit measured temperature controls driving of the Peltier element 12 to be in the set temperature range, the set temperature optimum operating temperature of the fluorescent tube or, surrounding temperature, is for example, 40 ° C..

【0020】駆動制御回路14は、例えば15v、−1 The drive control circuit 14, for example 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、 A 5v DC power source 17 a DC voltage is obtained, and converts the DC voltage from the DC power supply 17 voltage adapted to the Peltier element 12, for example 8v, or a DC voltage of -8v,
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。 A drive circuit 18 supplies the Peltier element 12, an amplifier circuit 19 for amplifying and comparing the output of the temperature sensor 13, a comparator circuit 20, composed of a timer circuit. 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。 Details of the drive control circuit 14 is as shown in FIG. 3 are denoted by the same reference numerals to the same components as in FIG. 1.

【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 [0021] In the above apparatus, when the ambient temperature of the fluorescent tube 10 is low, or like the lighting start mode, etc. When heating of the fluorescent tube itself is low fluorescent tubes 10, temperature detected by the temperature sensor 13 is above when it is less than the predetermined temperature range, the detection voltage Vd becomes less than the reference voltage V1, the Peltier element 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。 To is added the driving voltage side of the fluorescent tube side is heating function, the fluorescent tube 10 is heated by the heating of the Peltier element 12. 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。 Heat generated by the heating and the fluorescent tube itself by the Peltier element 12, when the temperature of the temperature sensor 13 reaches within a predetermined temperature range, the detection voltage Vd becomes the reference voltage V1 or higher, the power supply to the Peltier element 12 is stopped , heated by the Peltier element is eliminated by the drive stops. 従って、低温環境下における輝度の低下を防止できる。 Therefore, it is possible to prevent deterioration of luminance 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。 [0022] If the ambient temperature of the fluorescent tube is within a predetermined temperature range, or the like lighting start mode of the fluorescent tubes 10, heat generation of the fluorescent tube itself is low, the predetermined temperature range temperature is above a temperature sensor 13 If it is, the detection voltage Vd and becomes equal to or less than the reference voltage Vh by the reference voltage V1 or higher, to the Peltier element 13 is no power supply from the drive control circuit 14, the Peltier element 12 is not driven, overheating of the fluorescent tube 10 , cooling is not performed.

【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。 [0023] When the ambient temperature of the fluorescent tubes is high, or including such lighting start mode of the fluorescent tube 10, I phase 俟 with heating of the fluorescent tube itself, the temperature of the temperature sensor 13 exceeds a predetermined temperature range of the If, by the detection voltage Vd exceeds the reference voltage Vh, is to the Peltier element 12 is applied a drive voltage side of the fluorescent tube side is endothermic function, 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。 The heat generated by the heat and the fluorescent tube itself by the Peltier element 12, when the temperature of the temperature sensor 13 reaches within the predetermined temperature range, the detection voltage Vd becomes less than the reference voltage Vh, the power supply to the Peltier element 12 stop, cooled by the Peltier element 12 is eliminated by the drive stops.
従って、高温環境下での輝度低下を防止できる。 Therefore, it is possible to prevent reduction in luminance 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, according to the present invention, a high-temperature environment of up to -40 ℃ ~ + 80 ℃ 4, keeping also substantially constant luminance relative value in each of the low temperature environment can be, in addition to making it possible to widen the operating temperature range of the backlight device, can prevent a decrease in luminance, and supercooling, it is possible to prevent brightness reduction due to 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 device has both functions of heating and cooling, heater, not require large-scale device serving such a cooling fan, further thin backlight system of the same functions, light weight, compact reduction is 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、 Further the arrangement of the Peltier element by the above-described manner, uniform heating of the fluorescent tube, can be cooled,
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。 To keep the temperature distribution of the fluorescent tube uniformly, it is possible to make uniform the emission intensity distribution of the fluorescent tube is required when used as a flat light source.

【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。 [0028] By further heating in a low-temperature environment, can avoid short life at low temperatures, also, can be advanced lighting start than the emission luminance of up of the fluorescent tube, the stabilization.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【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。 1 shows a block 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。 2 shows a relationship diagram of a fluorescent tube and a Peltier element and the reflection plate 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。 3 shows a detailed circuit diagram of the drive control circuit of 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。 4 shows a relationship diagram between the ambient temperature and relative luminance values ​​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。 Figure 5 shows a graph showing the relationship between the mercury vapor pressure and the 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。 6 shows a relationship diagram between the ambient temperature and the relative luminance value when the characteristics of FIG.

【図7】従来例の構成図を示す。 7 shows a block diagram of a conventional example.

【符号の説明】 DESCRIPTION OF SYMBOLS

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 tubes 11 heat radiation shield reflector 12 Peltier element 13 temperature sensor 14 drive control circuit 15 lamp drive circuit 16 thermally conductive adhesive 17 DC power supply 18 driving circuit 19 amplifier circuit 20 comparison circuit

Claims (7)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 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 rear side of the liquid crystal display device or a fluorescent tube for illuminating the side surface,, EL, the light source such as a light emitting diode, the contact fixing temperature control device capable of heating and cooling the reflecting plate side of the light source, or on the back side or thermally coupled to the backlight device comprising.
  2. 【請求項2】 上記温度制御素子はペルチェ素子であることを特徴とする請求項1記載のバックライト装置。 Wherein said temperature control element backlight apparatus of claim 1, characterized in that the Peltier element.
  3. 【請求項3】 上記光源付近にに温度センサーを設置し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. A backlight device according to claim 1, wherein the detecting the temperature of the light source by installing a temperature sensor in the vicinity of the light source.
  4. 【請求項4】 上記温度センサーの出力と設定温度と比較を行い、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. and compare the temperature sensor output and the set temperature, according to claim 1, further comprising a drive control circuit for the power supply or a switching corresponding to the environmental temperature in the temperature control element backlight device.
  5. 【請求項5】 上記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、発熱を行うことを特徴とする請求項1記載のバックライト装置。 Wherein said temperature endotherm by switching the input voltage under varying environmental temperature of the control element, stop, fever backlight device according to claim 1, wherein the performing.
  6. 【請求項6】 上記光源の主電源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する請求項1記載のバックライト装置。 6. Simultaneously with the main power ON of the light source, the backlight device according to claim 1, further comprising a control circuit for the light source temperature is set at an appropriate temperature of the light source from ambient temperature by the temperature control device.
  7. 【請求項7】 上記温度制御素子の放熱をする反射シー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 reflective shield plate for heat radiation of the temperature control element.
JP5317219A 1993-12-17 1993-12-17 Back light device Pending JPH07175035A (en)

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

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP5317219A Pending JPH07175035A (en) 1993-12-17 1993-12-17 Back light device

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Country Link
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