| 摘要 |
PURPOSE:To make electromagnetic coupling loose between an antenna and a clock line and to suppress sensitivity degradation caused by noise by receiving a clock signal to be applied to a driver not through a CPU but through a clock generation part on a printed circuit board mounting the driver. CONSTITUTION:On a first printed circuit board 2, a clock generation part 23 is mounted to apply the clock signal to a driving part. In such a case, the clock generation part 23 is a CR oscillation circuit. A main printed circuit board 1 and the sub printed circuit board 2 are connected by a control line 51 and a bus line 52 of an LCD driver 21 and the clock is supplied from the clock generation part 23 to the LCD driver 21. The clock generation part 23 is provided on the same printed circuit board as the LCD driver 21 so that the length of the clock line to the LCD driver 21 can be made shortest. Therefore, the electromagnetic fields are not coupled between the higher harmonic wave of the clock and the antenna, and the higher harmonic of the clock can be prevented form being enlarged to a frequency affecting a radio part.
|
