| 摘要 |
<p>PURPOSE:To make it possible to supress the flash of a backlight by providing the information apparatus with a circuit for adjusting and stabilizing the brightness of the backlight only when an operation part uncontinuously requiring a large current from a battery is driven at the time of operating the apparatus. CONSTITUTION:At the time of driving a printer 4, a printer operation signal 8 is turned to an 'H' level and a constant voltage circuit 3 outputs an output setting voltage. The output is inputted to a backlight power supply circuit 5 and the backlight 6 lights up with brightness smaller than a proper value. Since the brightness is not reduced smaller than the output set voltage of the circuit 3 even if the voltage of the battery 2 is changed due to the influence of the operation of the printer 4, the input voltage of the circuit 5 is not changed and the brightness of the backlight 6 can be held at a fixed value. Consequently, the generation of a flash can be suppressed.</p> |
