| 摘要 |
PURPOSE:To eliminate the need for adjusting light emitting brightness after packaging and the need for the adjustment even in the case of replacement and extension by providing a voltage adjusting means capable of the adjustment of the light emitting brightness to be nearly equal. CONSTITUTION:Since seven-segmented LED displayers 1-3 whose emission brightness is nearly equal are used, emission brightness is nearly equal even when plural seven-segmented LED display devices are used. Furthermore, the voltage adjusting means 10 is set to a value so presetted that light emission brightness of each seven-segmental LED display device is set to almost equal to one using a seven-segmental LED displayer group whose emission brightness is the darkest corresponding to the emission brightnesses of groups in use. Thus, differences in the emission brightness are almost eliminated among the seven-segmented LED displayers, e.g., 1-3 in the seven-segmented LED display devices and also among the seven-segmented LED display devices. Hence, the need for adjusting the emission brightness after packaging on a display plate and even in the case of replacement and the extension the adjustment is not required. |
