| 摘要 |
PROBLEM TO BE SOLVED: To symmetrically invert a screen and to improve the versatility using a simply constituted bidirectional shift register in the driving circuit incorporated type liquid crystal display(LCD) employing polysilicon thin film trnasisotrs (p-SiTFTs). SOLUTION: Clock signals CLK and inverse clock signals *CLK, which are supplied to every stage of a bidirectional shift register, are supplied to one of the inputs of EXOR gates 4 and shift direction switching signals CHN are supplied to the other inputs. By controlling the Hi/Lo of the signals CHN, the inversion/non-inversion of the signals CLK and *CLK are controlled. Note that the shifting directions of the signals CHN are switched to either to the left or to the right by integrally conducting the controls of the start pulse supply terminals and left and right direction switchings. |
