Joke Collection Website - Mood Talk - Why is the advertising signboard of ICBC black during the day and white at night?
Why is the advertising signboard of ICBC black during the day and white at night?
That is a special LED luminous character, black hair and white: at present, there are two kinds of luminous characters in the market: 1 acrylic board is collectively called black and white board (imported) 2 resin casting (unsaturated, epoxy); Usually the word thickness is 8~ 10cm, and white or white-blue led light source is installed; Black fonts are static during the day and white at night.
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