| 摘要 |
A traffic signal display apparatus includes a display surface having a plurality of bicolor bipolar LEDs thereon in an array. When current is fed into the array in a first direction, the bicolor bipolar LEDs display a first color, which may be green. When current is fed into the array in a second direction, the bicolor bipolar LEDs display a second color, which may be yellow or amber. When current is fed into the array alternately in the first and second directions, the bicolor bipolar LEDs display a third color, which may be red. The display apparatus may be subdivided into multiple independent zones, allowing arrows to be displayed. The single display apparatus can therefore be used to replace the three to five stacked conventional traffic light display units.
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