???????????????? “????”“????”??????

??

2???????7????,????,??????????,???,????????,?????????,??“????”????,??????“??????????”,?????

????????????,“?????????”??????????????????LED??????????????,?????????????,???????????,??,?????????????

?1984???????1994????,???????????????

(??????? ????????)

????:??????

?????????

????????????????????? “????”“????”???????????

????????