| 摘要 |
An electroluminescent device based on bistability, and method for its use. The device alternates between a low resistance state and a high resistance state by application of an electrical voltage. A bistable electrical device has two electrodes sandwiching an organic material that produces bistable action. An organic light emitting diode next to the bistable device is emits light when conducting. To achieve graduated light output, circuitry is provided for applying to the bistable device a constant bias voltage intermediate a turnoff voltage and a turn-on voltage, and electrical pulses variable in a temporal pulse width or in an additional voltage, or in both. The additional voltage is superimposed on the bias voltage while the pulse is applied. The current through the bistable device, and therefore the brightness of light emitted by the diode after the pulse has ceased, are controlled by varying the pulse width or the additional voltage.
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