a polymer gel display , fabrication method and operating structure thereof . display is enabled by utilizing the flexing characteristic of a polymer - gel sheet . a pair of substrates is separated by a predetermined gap , and a polymer - gel sheet of a first color disposed therebetween , having two ends fixed , a center area flexible and contacting no more than one of the substrates . a fluid layer of a second color is disposed between the substrates , displaying its color via the substrate not contacting the polymer - gel sheet . an external electric field is applied to the polymer - gel sheet , flexing the polymer - gel sheet toward the substrate until making contact and the first color of the polymer - gel sheet is displayed via the substrate .