How is the LED house number made?

That kind of card is made of transparent or translucent (foggy) acrylic board as the panel, and the words of the house number are printed on the acrylic board by screen printing, and then a light box is made, and then the LED of the appropriate color is used as the backlight, and the words are not printed or printed in other transparent colors. Usually, the unlit places are painted black. Monochrome can directly transmit light to bright places. Colored ones are printed in transparent color to the display place, and white tubes are used as backlight.