JPH06324304A - Back light for lcd - Google Patents
Back light for lcdInfo
- Publication number
- JPH06324304A JPH06324304A JP10863493A JP10863493A JPH06324304A JP H06324304 A JPH06324304 A JP H06324304A JP 10863493 A JP10863493 A JP 10863493A JP 10863493 A JP10863493 A JP 10863493A JP H06324304 A JPH06324304 A JP H06324304A
- Authority
- JP
- Japan
- Prior art keywords
- temp
- lcd
- temperature
- backlight
- reflection plate
- 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
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はＬＣＤ用バックライトに
関し、特に車載用ＬＣＤ用バックライトに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCD backlight, and more particularly to a vehicle-mounted LCD backlight.
【０００２】[0002]
【従来の技術】従来のＬＣＤ用バックライトは、図４に
示すように、光源となる蛍光管１とこの蛍光管１から照
射された光を反射しＬＣＤパネル（図示せず）を表示さ
せる反射板２によって構成されていた。2. Description of the Related Art As shown in FIG. 4, a conventional LCD backlight reflects a fluorescent tube 1 as a light source and a light emitted from the fluorescent tube 1 to display an LCD panel (not shown). It was constituted by the plate 2.
【０００３】また、図５に示すように、低温時の液晶表
示素子（ＬＣＤパネル）の温度補償を行う目的でＬＣＤ
用バックライト８の近傍に周囲温度検出用の温度センサ
４を配置し、ＬＣＤ用バックライト８の下側に発熱体７
を設け、低温時に液晶表示素子の温度補償を行う構造の
液晶表示装置９も報告されている（実開平１−１４０５
２０号公報参照）。Further, as shown in FIG. 5, an LCD is used for the purpose of temperature compensation of a liquid crystal display element (LCD panel) at a low temperature.
The temperature sensor 4 for detecting the ambient temperature is arranged in the vicinity of the backlight 8 for the LCD, and the heating element 7 is provided below the backlight 8 for the LCD.
A liquid crystal display device 9 having a structure in which the temperature compensation of the liquid crystal display element is performed at a low temperature is also reported (Actual Publication No. 1-1405).
20).
【０００４】[0004]
【発明が解決しようとする課題】この従来のＬＣＤ用バ
ックライトは環境温度に対する輝度変化が激しく、２０
〜４０℃の範囲内では１９５０〜２０５０ｃｄ／ｍ2 の
輝度を維持するが、この温度範囲外では徐々に輝度が低
下し、−２０℃では５０ｃｄ／ｍ2 ，＋８０℃では８０
０ｃｄ／ｍ2 になるという欠点があった。This conventional LCD backlight has a large change in brightness with respect to the ambient temperature.
The brightness of 1950 to 2050 cd / m 2 is maintained in the range of -40 ° C, but the brightness gradually decreases outside this temperature range, and is 50 cd / m 2 at -20 ° C and 80 at + 80 ° C.
There was a drawback that it was 0 cd / m 2 .
【０００５】また、７０℃以上の高温時では、室温での
使用に比べ寿命が１／３程度に低下するという問題点が
あり、０℃以下の低温時では、液晶の応答速度が低下す
ることにより表示不良が起こるという問題点があった。Further, at a high temperature of 70 ° C. or higher, there is a problem that the life is reduced to about 1/3 as compared with the use at room temperature, and at a low temperature of 0 ° C. or lower, the response speed of the liquid crystal is lowered. Therefore, there is a problem that a display defect occurs.
【０００６】本発明の目的は、環境温度に対する輝度変
化が小さく、高温使用時での寿命の劣化や低温使用時で
の液晶の応答速度の低下による表示不良のないＬＣＤ用
バックライトを提供することにある。An object of the present invention is to provide a backlight for LCD which has a small change in luminance with respect to ambient temperature and has no display failure due to deterioration of life at high temperature use and deterioration of response speed of liquid crystal at low temperature use. It is in.
【０００７】[0007]
【課題を解決するための手段】本発明は、光源となる蛍
光管と、この蛍光管から照射された光を反射する反射面
とを有するＬＣＤ用バックライトにおいて、前記反射面
又はこの反射面の周囲に設けられた加熱及び冷却の機能
を有するペルチェ素子と、前記ＬＣＤ用バックライトの
内部の温度を検知する温度センサと、この温度センサか
らの情報により前記ペルチェ素子の加熱及び冷却の制御
を行う温度制御部とを備えている。The present invention relates to an LCD backlight having a fluorescent tube as a light source and a reflective surface for reflecting the light emitted from the fluorescent tube. A Peltier element having a heating and cooling function provided in the periphery, a temperature sensor for detecting the temperature inside the LCD backlight, and heating and cooling of the Peltier element are controlled by information from the temperature sensor. And a temperature controller.
【０００８】[0008]
【作用】温度センサにより検知した情報を温度制御部で
電流を制御してペルチェ素子に送り、ペルチェ効果によ
り寒冷時にはヒータとして、また、高温時には冷却素子
として機能させ、ＬＣＤ用バックライト内の温度を所定
の温度範囲に制御する。The information detected by the temperature sensor is sent to the Peltier element by controlling the current in the temperature control section, and it functions as a heater in the cold and a cooling element in the high temperature by the Peltier effect, and controls the temperature in the LCD backlight. Control within a predetermined temperature range.
【０００９】[0009]
【実施例】次に、本発明の実施例について図面を参照し
て説明する。Embodiments of the present invention will now be described with reference to the drawings.
【００１０】図１は本発明の第１の実施例の構成を示す
断面図である。本発明の第１の実施例は、図１に示すよ
うに、反射板２のかど部に固定したペルチェ素子３の上
部に蛍光管１を配置する。このとき、反射効率の低下を
おさえるためペルチェ素子３の長さを蛍光管１の直径ま
たはそれ以下とする。一方、反射板２の内面に温度セン
サ４を配置し、ペルチェ素子３と温センサ４を温度制御
部５に接続する。FIG. 1 is a sectional view showing the structure of the first embodiment of the present invention. In the first embodiment of the present invention, as shown in FIG. 1, a fluorescent tube 1 is arranged above a Peltier element 3 fixed to a corner of a reflector 2. At this time, the length of the Peltier element 3 is set to the diameter of the fluorescent tube 1 or less in order to suppress the decrease in reflection efficiency. On the other hand, the temperature sensor 4 is arranged on the inner surface of the reflection plate 2, and the Peltier element 3 and the temperature sensor 4 are connected to the temperature control unit 5.
【００１１】ＬＣＤ用バックライトをこのような構成に
することにより、反射板２の内面に配置した温度センサ
４がＬＣＤ用バックライト内の温度を検知しその情報を
温度制御部５へ送る。温度制御部５は、この情報により
ＬＣＤ用バックライト内を常時５〜４０℃の温度範囲に
保つようペルチェ素子３を制御する。一方、ペルチェ素
子３が蛍光管１と反射板２との間に固定されているた
め、反射板２の反射効率の低下を０．５％以下におさえ
て蛍光管１の輝度変化をなくし、液晶表示装置及びその
周辺の環境温度が−２０〜＋１００℃の範囲で変化して
も、輝度を１９５０〜２０５０ｃｄ／ｍ2 の範囲内に維
持することができた。また、蛍光管１の熱的劣化がなく
なり、寿命を３倍に伸ばすことができた。By configuring the LCD backlight as described above, the temperature sensor 4 arranged on the inner surface of the reflection plate 2 detects the temperature in the LCD backlight and sends the information to the temperature controller 5. The temperature control unit 5 controls the Peltier element 3 so that the inside of the LCD backlight is always kept in the temperature range of 5 to 40 ° C. based on this information. On the other hand, since the Peltier element 3 is fixed between the fluorescent tube 1 and the reflection plate 2, the decrease in the reflection efficiency of the reflection plate 2 is suppressed to 0.5% or less to eliminate the brightness change of the fluorescent tube 1, and the liquid crystal The brightness could be maintained within the range of 1950 to 2050 cd / m 2 even if the environmental temperature of the display device and its surroundings changed within the range of −20 to + 100 ° C. Further, the fluorescent tube 1 was not thermally deteriorated, and the life could be tripled.
【００１２】図２は本発明の第２の実施例の構成を示す
断面図である。本発明の第２の実施例は、図２に示すよ
うに、反射板２の下面にペルチェ素子３を配置する。一
方、反射板２の内面に温度センサ４を配置し、ペルチェ
素子３と温度センサ４を温度制御部５に接続する。FIG. 2 is a sectional view showing the configuration of the second embodiment of the present invention. In the second embodiment of the present invention, as shown in FIG. 2, the Peltier element 3 is arranged on the lower surface of the reflection plate 2. On the other hand, the temperature sensor 4 is arranged on the inner surface of the reflection plate 2, and the Peltier element 3 and the temperature sensor 4 are connected to the temperature control unit 5.
【００１３】ＬＣＤバックライトをこのような構成にす
ることによっても、第１の実施例と同様に機能し、同じ
効果が得られる。第２の実施例では、ペルチェ素子３を
反射板２の下側に配置しているので、光の反射効率の低
下がなくなるという利点がある。Even if the LCD backlight has such a structure, it functions similarly to the first embodiment, and the same effect can be obtained. In the second embodiment, since the Peltier element 3 is arranged below the reflection plate 2, there is an advantage that the reduction of the light reflection efficiency is eliminated.
【００１４】図３は本発明の第３の実施例の構成を示す
断面図である。本発明の第３の実施例は、図３に示すよ
うに、ペルチェ素子３を反射板の形状に成形し、その内
面に反射層６を形成する。一方、反射層６の内面に温度
センサを配置し、ペルチェ素子３と温度センサ４を温度
制御部５に接続する。FIG. 3 is a sectional view showing the structure of the third embodiment of the present invention. In the third embodiment of the present invention, as shown in FIG. 3, the Peltier element 3 is formed in the shape of a reflection plate, and the reflection layer 6 is formed on the inner surface thereof. On the other hand, a temperature sensor is arranged on the inner surface of the reflective layer 6, and the Peltier element 3 and the temperature sensor 4 are connected to the temperature control unit 5.
【００１５】ＬＣＤ用バックライトをこのような構成に
することによっても、第１の実施例と同様に機能し、同
じ効果が得られる。第３の実施例では、ベルチェ素子３
がＬＣＤ用バックライトの外枠を形成しているので、Ｌ
ＣＤ用バックライトだけでなく液晶表示装置全体を温度
制御することが可能となる。このため、５℃以下の低温
時においても、常時、５℃を保つことができるため、液
晶の応答速度が−１０℃における１００ｍｓから３５ｍ
ｓに改善されるという利点もある。Even if the LCD backlight has such a structure, it functions similarly to the first embodiment and obtains the same effect. In the third embodiment, the Peltier device 3
Forms the outer frame of the LCD backlight, so L
It is possible to control the temperature of the entire liquid crystal display device as well as the backlight for a CD. Therefore, even when the temperature is 5 ° C. or lower, the temperature can be kept at 5 ° C. at all times.
It also has the advantage of being improved to s.
【００１６】[0016]
【発明の効果】以上説明したように本発明は、温度制御
部により制御されたペルチェ素子がＬＣＤ用バックライ
ト内もしくは液晶表示装置全体の温度制御を行う。これ
により、ＬＣＤ用バックライト内の蛍光管の輝度を環境
温度が−２０℃〜１００℃の間で常時１９５０〜２０５
０ｃｄ／ｍ2 を維持することが可能となった。また、蛍
光管の熱的劣化が低減され寿命を３倍に伸ばすことがで
きるという効果がある。As described above, according to the present invention, the Peltier element controlled by the temperature control unit controls the temperature in the LCD backlight or the entire liquid crystal display device. As a result, the brightness of the fluorescent tube in the LCD backlight is always 1950 to 205 when the ambient temperature is between -20 ° C and 100 ° C.
It became possible to maintain 0 cd / m 2 . Further, there is an effect that the thermal deterioration of the fluorescent tube is reduced and the life can be tripled.
【００１７】一方、液晶表示装置全体が温度制御される
場合には、−１０℃の低温時の液晶の応答速度が１００
ｍｓから３５ｍｓに改善され、＋６０℃以上の高温時で
は階調時の温度依存をおさえることができるという効果
がある。On the other hand, when the temperature of the entire liquid crystal display device is controlled, the response speed of the liquid crystal at a low temperature of -10 ° C. is 100.
It is improved from ms to 35 ms, and there is an effect that the temperature dependence during gradation can be suppressed at a high temperature of + 60 ° C. or higher.
【図１】本発明の第１の実施例の構成を示す断面図であ
る。FIG. 1 is a sectional view showing a configuration of a first exemplary embodiment of the present invention.
【図２】本発明の第２の実施例の構成を示す断面図であ
る。FIG. 2 is a sectional view showing a configuration of a second exemplary embodiment of the present invention.
【図３】本発明の第３の実施例の構成を示す断面図であ
る。FIG. 3 is a sectional view showing a configuration of a third exemplary embodiment of the present invention.
【図４】従来のＬＣＤ用バックライトの構成の一例を示
す断面図である。FIG. 4 is a cross-sectional view showing an example of the configuration of a conventional LCD backlight.
【図５】従来のバックライトの下側に発熱体を設けて温
度補償を行う液晶表示装置の構成を示す断面図である。FIG. 5 is a cross-sectional view showing a configuration of a liquid crystal display device in which a heating element is provided below a conventional backlight to perform temperature compensation.
１ 蛍光管 ２ 反射板 ３ ペルチェ素子 ４ 温度センサ ５ 温度制御部 ６ 反射層 ７ 発熱体 ８ バックライト ９ 液晶表示装置 1 Fluorescent Tube 2 Reflecting Plate 3 Peltier Element 4 Temperature Sensor 5 Temperature Control Section 6 Reflective Layer 7 Heating Element 8 Backlight 9 Liquid Crystal Display Device
Claims (4)
射された光を反射する反射面とを有するＬＣＤ用バック
ライトにおいて、前記反射面又はこの反射面の周囲に設
けられた加熱及び冷却の機能を有するペルチェ素子と、
前記ＬＣＤ用バックライトの内部の温度を検知する温度
センサと、この温度センサからの情報により前記ペルチ
ェ素子の加熱及び冷却の制御を行う温度制御部とを備え
たことを特徴とするＬＣＤ用バックライト。1. A backlight for LCD having a fluorescent tube as a light source and a reflective surface for reflecting light emitted from the fluorescent tube, wherein heating and cooling are provided on the reflective surface or around the reflective surface. A Peltier element having the function of
An LCD backlight, comprising: a temperature sensor for detecting the temperature inside the LCD backlight; and a temperature control section for controlling heating and cooling of the Peltier element based on information from the temperature sensor. .
反射板上の位置に配置されたことを特徴とする請求項１
記載のＬＣＤ用バックライト。2. The Peltier device is arranged at a position on a reflection plate near a fluorescent tube.
Backlight for LCD described.
置されたことを特徴とする請求項１記載のＬＣＤ用バッ
クライト。3. The backlight for LCD according to claim 1, wherein the Peltier element is arranged on a bottom surface of a reflection plate.
形され内面に反射層が形成されたことを特徴とする請求
項１記載のＬＣＤ用バックライト。4. The backlight for LCD according to claim 1, wherein the Peltier device is formed in the shape of a reflection plate and a reflection layer is formed on the inner surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10863493A JPH06324304A (en) | 1993-05-11 | 1993-05-11 | Back light for lcd |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10863493A JPH06324304A (en) | 1993-05-11 | 1993-05-11 | Back light for lcd |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06324304A true JPH06324304A (en) | 1994-11-25 |
Family
ID=14489776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10863493A Pending JPH06324304A (en) | 1993-05-11 | 1993-05-11 | Back light for lcd |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06324304A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006140332A (en) * | 2004-11-12 | 2006-06-01 | Koyo Thermo System Kk | Thermal processor |
| US7164224B2 (en) | 2000-12-14 | 2007-01-16 | Sharp Kabushiki Kaisha | Backlight having discharge tube, reflector and heat conduction member contacting discharge tube |
| JP2007286611A (en) * | 2006-03-21 | 2007-11-01 | Semiconductor Energy Lab Co Ltd | Backlight device and display device |
| US7731377B2 (en) | 2006-03-21 | 2010-06-08 | Semiconductor Energy Laboratory Co., Ltd. | Backlight device and display device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0218857A (en) * | 1988-07-04 | 1990-01-23 | Japan Aviation Electron Ind Ltd | Fluorescent lamp device |
-
1993
- 1993-05-11 JP JP10863493A patent/JPH06324304A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0218857A (en) * | 1988-07-04 | 1990-01-23 | Japan Aviation Electron Ind Ltd | Fluorescent lamp device |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7541723B2 (en) | 2000-12-14 | 2009-06-02 | Sharp Kabushiki Kaisha | Backlight having a polarization separating element |
| US7164224B2 (en) | 2000-12-14 | 2007-01-16 | Sharp Kabushiki Kaisha | Backlight having discharge tube, reflector and heat conduction member contacting discharge tube |
| US7169005B2 (en) | 2000-12-14 | 2007-01-30 | Sharp Kabushiki Kaisha | Method of producing a backlight having a discharge tube containing mercury |
| US7309146B2 (en) | 2000-12-14 | 2007-12-18 | Sharp Kabushiki Kaisha | Backlight having discharge tube, reflector and heat conduction member contacting discharge tube |
| JP2006140332A (en) * | 2004-11-12 | 2006-06-01 | Koyo Thermo System Kk | Thermal processor |
| US7731377B2 (en) | 2006-03-21 | 2010-06-08 | Semiconductor Energy Laboratory Co., Ltd. | Backlight device and display device |
| JP2007286611A (en) * | 2006-03-21 | 2007-11-01 | Semiconductor Energy Lab Co Ltd | Backlight device and display device |
| US7950816B2 (en) | 2006-03-21 | 2011-05-31 | Semiconductor Energy Laboratory Co., Ltd. | Backlight device and display device |
| US8132931B2 (en) | 2006-03-21 | 2012-03-13 | Semiconductor Energy Laboratory Co., Ltd. | Backlight device and display device |
| JP2012182152A (en) * | 2006-03-21 | 2012-09-20 | Semiconductor Energy Lab Co Ltd | Lighting device and display device |
| US8277068B2 (en) | 2006-03-21 | 2012-10-02 | Semiconductor Energy Laboratory Co., Ltd. | Backlight device and display device |
| US8733959B2 (en) | 2006-03-21 | 2014-05-27 | Semiconductor Energy Laboratory Co., Ltd. | Backlight device and display device |
| JP2014239073A (en) * | 2006-03-21 | 2014-12-18 | 株式会社半導体エネルギー研究所 | Liquid crystal display device |
| JP2022016483A (en) * | 2006-03-21 | 2022-01-21 | 株式会社半導体エネルギー研究所 | Back light device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19960109 |