lcd back lighting method

Electroluminescent (EL) back light thin lightweight body provides uniform light. Its low power consumption, the required operating voltage of 80 ~ 100Vac, provides the operating voltage of the inverter can be converted to 5/12/24Vdc input AC output.

As the EL back light of limited life (at 50% brightness average life under the conditions of 3000 to 5000 hours in the life of a higher brightness level will be greatly shortened), so the ideal inverter for EL back light allows the output voltage and frequency with increasing aging of the EL lamp, and thus the rear extension of the EL display of the effective light source life.

EL back light for like a watch, a digital desktop clock and monochrome PDA, etc. require extremely faint illumination so dimly lit or dark conditions using a small reflective LCD applications, it is more suitable. However, low efficiency, low brightness, and its use in short-life such as a laptop computer and a desktop flat panel monitors such as requirements of large transmissive graphic lcd modules backlighting applications.

LED back light EL longer than the life (over 5000 hours), and a DC voltage, typically used in small monochrome display, such as front cellular phone, remote control, microwave, stereo audio equipment. However, the brightness is not enough to provide for large transflective display with back light.

Small cold cathode fluorescent lamp (CCFL) are provided for large OLED Display Module desired brightness and life (as well as lighting control capacity), which it is still the most common method of backlighting causes. However, the heat accumulation is a matter of concern.

Rear light assembly from the past with relatively moderate power levels driven one or two CCFL increased to 30W or 60W of power for up to 12 (or 16) Root lamps. As in a relatively small space with so much power used, so heat accumulation makes the back of the monitor light source assembly of all the elements are in most of the early application of the LCD module not occur on the force level. Moreover, electrical efficiency and lighting control capabilities are also close to the limit.