Abstract: A cholesteric liquid crystal writing board comprises a cholesteric liquid crystal device, a photo-sensing array layer and a mode control unit. The photo-sensing array layer is disposed at one side of the light-emitting surface of the cholesteric liquid crystal device. The photo-sensing array layer comprises a plurality of gate control lines and a plurality of mode control lines. The mode control unit comprises a main control circuitry and a plurality of mode switches coupled to the main control circuitry. Each mode switch is coupled to one of the mode control lines correspondingly. The gate control lines intersect with the mode control lines so as to define a plurality of light sensing areas arranged in an array. Each light sensing area has a switch element and a light-sensing element. The main control circuitry controls each mode switch to be switched between a voltage output mode and a voltage write mode.

Abstract: An output high power transformer, including a primary and a secondary in galvanic isolation forming a flyback converter, wherein the primary includes at least one primary winding having at least two primary turns and a rectifier including a junction diode circuit; the secondary includes at least one secondary winding having at least one secondary turn; and the flyback converter includes at the primary at least one metal-oxide-semiconductor field-effect transistor (MOSFET), notably a Silicon Carbide MOSFET, and at the secondary at least one Silicon Carbide diode.