Electroluminescence (EL): EL backlight is thin in thickness, light in weight and uniform in light emission. It can be used in different colors, but is most commonly used for mobile phone LCD
white light backlights. The EL backlight has low power consumption and only needs a voltage of 80-110VAC, which can be obtained by transforming 5V, 12V or 24VDC through a transformer. The half-life of EL backlight is about 2000-5000 hours. Light-emitting diode (LED): LED backlight is mainly used for character modules. Longer life than EL (minimum 5000 hours), stronger light, but greater energy consumption. As a solid-state device, it directly uses 5VDC. The mobile phone LCD is generally arranged directly behind the mobile phone LCD, and the thickness should be increased by 5mm. The LED can emit light of different colors, the most common being yellow-green light. Cold Cathode Fluorescent Lamp (CCFL): CCFL can provide low energy consumption and bright white light. It emits light from a cold cathode fluorescent tube, and the light is evenly dispersed in the window area through a diffuser. The side backlight is small in size and low in energy consumption, but CCFL needs a transformer to supply 270-300VAC power. It is mainly used for graphic LCDs, with a life span of 10,000-15,000 hours.
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