You can see the light paper or el-panel (electroluminescent panel) in electronic devices such as old mobile phones, car radios, watches and other equipment, where it serves as a backlight for buttons, screen.Its difference from LED illumination is that the light intensity on the entire area of the light paper is the same, but the minus of the light paper is the presence of a voltage converter for the light paper.The paper is a thin and flexible capacitor made in the form of two plates.Between the plates there is a luminescent thin layer of a chemical substance, which is actually it shines when a high AC voltage capacitor is applied to the plates.
In order to clearly understand what a light paper is, I will disassemble the illuminated clock and you will see how it works.So, the Scarlett table clock, powered by a single finger battery, when you press the button, the backlight of the dial appears.
Inside the watch there is a of a voltage converter on one transistor, this is the source of high high-frequency voltage for the light paper.Some converters are inconvenient because they can emit a high-frequency squeak.
The light paper is thin, its thickness is like several layers of scotch tape.It can be bent a little.
In the dark, it does not shine as bright as LEDs, but it is quite unusual.Paper can be bought in various sizes and it can be sold already with a voltage converter.
The paper can be powered from a 220V AC.This requires only one or two current-limiting resistors.How to do this, watch the video.
