| 摘要 |
<p>PURPOSE:To improve the contrast and sensitivity by specifying the dielectric constant of organic binder of electric field light emitting layer (EL layer) and the dielectric constant of organic binder of photo conductive layer (PC layer). CONSTITUTION:A clear glass substrate 2, a clear electrode layer 4, an EL layer 6, a dielectric layer 8, a PC layer 10 and a rear electrode layer 12 are sequentially laminated. The relative dielectric constant of organic binder of EL layer 6 is made larger than 12 and, on the other hand, the relative dielectric constant of organic binder of the PC layer 10 is made smaller than 7. For a better case, the dielectric constant of organic binder of EL layer 6 is made larger than 15 and, on the other hand, the dielectric constant of organic binder of the PC layer 10 is made smaller than 5. As organic binders with a high dielectric constant, cyanoethylcellulose and cyanoethylpullulan, etc., can be considered. On the other hand, acrylic resin, ethylcellulose, etc., can be considered as the organic binder with a low dielectric constant. By doing this, both the contrast and sensitivity can be enhanced.</p> |
