COLOR ELECTROOPTIC DEVICE BY FERROELECTRIC LIQUID CRYSTAL

摘要

PURPOSE:To permit desired color display by providing a period for holding image plane information after writing of said information to a ferroelectric liquid crystal and continuing the light emission of a plane light emitting element during said holding period. CONSTITUTION:An OPEN signal controls the transfer from a writing action to memory action to a driving circuit when the OPEN signal changes from L to H. The signal DATA to be inputted to a segment driving circuit 11 via an OR gate 14 is forcibly brought to the H when the signal OPEN goes to the H. A signal DF is forcibly brought to the L via an inverter 15 and an AND circuit 16. All the segments of an LC panel 12 attain a VDD level as is evident from the segment output truth table. An FLM inputted to a common driver 13 via an OR gate 17 is forcibly brought to the H when the signal OPEN goes to the H. The signal DF is forcibly brought to the H via an OR gate 18. All the common values of the LC panel attain the VDD level at this time. The segments and common values maintain the memory state.