| CPC G09G 3/3233 (2013.01) [G09G 2300/0814 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0626 (2013.01); G09G 2330/021 (2013.01); G09G 2330/10 (2013.01)] | 16 Claims | 

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               1. A display device comprising: 
            a pixel circuit; a driver circuit; and a functional circuit, 
                wherein the driver circuit is configured to output a signal for performing display in the pixel circuit, 
                wherein the functional circuit comprises a CPU comprising a CPU core comprising a flip-flop electrically connected to a backup circuit, 
                the display device further comprising: 
                a first transistor and a second transistor; 
                    an insulator over the first transistor and the second transistor; and 
                    a third transistor and a fourth transistor over the insulator, 
                  wherein the driver circuit comprises the first transistor, 
                wherein the flip-flop comprises the second transistor, 
                wherein the pixel circuit comprises the third transistor, and 
                wherein the backup circuit comprises the fourth transistor. 
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