| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the disturbance of a display picture on a screen in selecting a channel by reading picture element data written in synchronizing with a self-running clock signal and supplying it to a display driving means. SOLUTION: A memory control circuit 9 alternately sets the write mode and the reading mode of respective memories 51 and 52 at every two periods of a self-running clock 2. The memory 51 becomes the write mode when it is connected to a data processing circuit 4 through the contact point '1' of a switch SW1. The memory 52 becomes the read mode when it is connected to a column electrode driver 6 through the contact point '0' of a switch SW2. The memory 51 becomes the read mode when it is connected to the column electrode driver 6 through the contact point '1' of the switch SW2, and the memory 52 becomes the write mode when it is connected to the data processing circuit 4 through the contact point '0', of the switch SW1. |
