| 摘要 |
PURPOSE:To prevent the flickering of a display value by providing display driving circuit which drives a light emitting element with a pulse from a pulse forming means to display the value on the basis of a AD conversion output. CONSTITUTION:The photometric output sampled in a capacitor C1 is subjected to AD conversion continuously repeatedly by a AD converting circuit AD, and the AD conversion value is inputted to a CPU at every time when AD conversion is terminated, and the current AD conversion value is sent from the CPU to a display controller DISP. Since the value is decoded to a signal for display by this controller DISP and is transmitted to display elements LED1-LEDn through AND gates AND1-ANDn, photometric value information is displayed on display elements. Even if the AD conversion cycle of the AD converter AD is long, the display operation is performed at every display cycle on the basis of the current AD conversion value inputted to the CPU. Thus, the flickering of the display value is prevented. |
