A phenolic resin that increases its toughness by polydimethylsiloxane and a process of preparing the same is provided. A second optical modulator modulates the modulated optical signal with a reference signal and provides a twice modulated optical signal. The test images are presented to a person and it is determined if recognition occurs and if so how certain and how correct. The piezoelectric transformer is used in a circuit for providing electro-luminescent backlighting.