Display device and driving method thereof

Abstract

Regarding the time gradation method as the digital gradation expression method, it is an object of the invention to provide a display device which prevents a reduction of frame frequency and implements a low-power-consumption SRAM. The invention overcomes the aforementioned disadvantages of conventional technique by synchronizing a writing and reading by utilizing read and write signals of which states read at a certain timing to select which of two memories is efficient to be written.

1 . A display device having a light emitting element and expressing a gradation with a length of lighting time,
 said display device comprising:   first and second memories;   a conversion circuit to convert video signals from serial to parallel; and   first switch and second switch,   wherein the video signal is inputted to said first memory or said second memory through said first switch after converted to parallel by said conversion circuit, and   an output signal of said first memory or said second memory is inputted to a display through said second switch.   
   
   
       2 . A display device according to  claim 1 ,
 wherein said memory is implemented on FPC.   
   
   
       3 . A display device according to  claim 1 ,
 wherein said memory is implemented over a substrate.   
   
   
       4 . An electronic device comprising the display device of  claim 1 .