| 摘要 |
PURPOSE:To dispense with a current interference preventing diode and to realize a display provided with a lamp test function which can be lessened in wiring length by a method wherein the display itself is provided with a test function. CONSTITUTION:In a display composed of LED elements 11-1N, a printed wiring board 20 mounted with the LED elements 11-1N, a display 30 which displays necessary data as being irradiated with emission of the LED elements 11-1N, and a case 40 which houses the printed wiring board 20 and the display 30, a lamp test contact 50 is provided so as to carry out the lighting test of the LED elements 11-1N. |
