【図面の簡単な説明】[Brief explanation of drawings]
第１図は本考案の第一実施例を示す液晶表示装
置の縦断側面図、第２図は同じく冷陰極管蛍光灯
の取付け状態を示す斜視図、第３図は同じく制御
回路の電気回路図、第４図は同じく環境温度と冷
陰極管蛍光灯の表面温度と冷陰極管蛍光灯の輝度
との関係を示す線図、第５図は本考案の第二実施
例を示す液晶表示装置の縦断側面図、第６図は本
考案の第三実施例を示す液晶表示装置の縦断側面
図、第７図は本考案の第四実施例を示す液晶表示
装置の縦断側面図、第８図は本考案の第五実施例
を示す液晶表示装置の縦断側面図、第９図は従来
の液晶表示装置の縦断側面図、第１０図は同じく
環境温度と冷陰極管蛍光灯の輝度との関係を示す
線図である。
１：液晶表示板、２：拡散板、３：ライトカー
テン、４：光源（冷陰極管蛍光灯）、５：反射板
、６：加熱器、７：ガラス板、８：冷陰極管収容
室、９：温度センサ、１０：外枠、１１：比較駆
動手段。
Fig. 1 is a vertical side view of a liquid crystal display device according to the first embodiment of the present invention, Fig. 2 is a perspective view showing the installation state of a cold cathode fluorescent lamp, and Fig. 3 is an electric circuit diagram of the control circuit. , FIG. 4 is a diagram showing the relationship between the ambient temperature, the surface temperature of the cold cathode fluorescent lamp, and the brightness of the cold cathode fluorescent lamp, and FIG. 5 is a diagram showing the relationship between the ambient temperature, the surface temperature of the cold cathode fluorescent lamp, and the brightness of the cold cathode fluorescent lamp, and FIG. FIG. 6 is a longitudinal side view of a liquid crystal display device showing a third embodiment of the present invention, FIG. 7 is a longitudinal side view of a liquid crystal display device showing a fourth embodiment of the present invention, and FIG. 8 is a longitudinal side view of a liquid crystal display device showing a fourth embodiment of the present invention. FIG. 9 is a longitudinal side view of a liquid crystal display device showing a fifth embodiment of the present invention, FIG. 9 is a longitudinal side view of a conventional liquid crystal display device, and FIG. FIG. 1: Liquid crystal display board, 2: Diffusion plate, 3: Light curtain, 4: Light source (cold cathode fluorescent lamp), 5: Reflector, 6: Heater, 7: Glass plate, 8: Cold cathode tube storage chamber, 9: Temperature sensor, 10: Outer frame, 11: Comparison drive means.