| 摘要 |
Semiconductor device reduces power consumption of total display system. A display memory 12 is operated by a power RVDD and stores display data WD at a determined timing based on various signals from a logic section 11. The display memory 12 outputs the stored display data WD as display data RD to a source driver 15 based on the various signals from the logic section 11. A bias circuit 14 detects a memory write signal MAW and a memory read signal MAR of the logic section 11 to the display memory 12 and controls bias of a power section for memory 13a based on detected result. The power section for memory 13a is configured by an analog amplifier and steps down voltage of a power terminal VCC and keeps constant and supplies the constant voltage as the power RVDD to the display memory 12. A driving capacity of the power section for memory 13a can be varied by changing a bias current by controlling the bias circuit 14. |
