Frishauf, Holtz, Goodman, Langer & Chick, P.C.
Method of driving display device
 A phototransistor having a non-linear light vs. conductivity characteristics and an organic electroluminescent layer are sandwiched by a pair of electrodes, a predetermined voltage is applied to the pair of electrodes, and address light is irradiated on a phototransistor to let a current flow in the phototransistor, thus causing the electroluminescent layer to emit light. It is therefore possible to drive the device to present crosstalk-free gradation display with a high contrast ratio. 
Casio Computer Co., Ltd.
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Ichiro Hiroyasu Masaharu
Kono Yamada Shioya