为了满足特殊场合的显示需要而研制的特种显示设备，建立了显示终端亮度和环境光照度之间的数学关系。为了满足不同用户的需求，文章提出了一种根据用户的调节结果来修正该数学关系的方法，并在此基础上完成了原理样机的研制。采用国产硅光电池和滤光片能够较为准确地测量环境光照度和显示亮度，并使系统能按对应关系以最佳的亮度来工作，用户在不满意的情况下，可以通过按键来人工调节亮度，单片机以人工调节的结果来改变该数学关系，并能记忆该数学关系。此显示终端能满足户外和高、低温环境下的特殊要求。

In order to meet the needs of special environment of the display, a display terminal brightness and ambient illumination mathematical relationship is established. In order to meet the needs of different users, a method is presented for users to modify the regulation of the relationship. Based on this, the prototype of display terminal has been completed. By using the silicon photovoltaic cells and the filter, the ambient illumination and display brightness can be measured accurately. The brightness of the prototype can be adjusted automatically. When users are not satisfied with the brightness, they can manually adjust the brightness. The SCM can change the mathematical relationship according to the result of artificial regulation and can remember the mathematical relationship. The display terminal can meet the outdoor, high and low temperature environment of the special requirements.