Selection of Backlight Source

Release Date:

2020-03-31 16:47

Source:

www.yisitelens.com

The backlight is a light source positioned behind the liquid crystal display (LCD), and its luminous performance directly affects the perceived depth of the LCD module (LCM). The LCD itself does not emit light; it displays images or reflects light modulated by an external light source. In backlight design, the selection of the appropriate light source is crucial.

Backlight It is a light source positioned behind the liquid crystal display (LCD), and its luminous performance directly affects the perceived depth of the LCD module (LCM). The LCD itself does not emit light; it displays images or reflects the light modulated by the backlight.
In Backlight In the design scheme, the selection of commonly used light sources is of great importance. The choice of light source determines key optical parameters of the backlight, such as power, chromaticity, and color tone, and also influences its application standards and service life. The following table provides a brief comparative overview of light sources suitable for LCD backlights, along with their characteristics: Light Source Type | Color Tone | Power (W) | Lifetime (h)
(Hour) Characteristics
Spot-type light source, lamp (light bulb), 2800K ±1.0, above 2,000; simple, compact and medium-sized, low cost, large volume, but generates significant heat.
LED (light-emitting diode) blue–red 430–700 nm above 0.038 100,000 long lifespan, low heat generation slightly lower color rendering index
Strip-type light source CCFL (cold cathode fluorescent lamp): red, green, blue, and mixed colors; 1.0–10.0; 25,000 hours; brighter and longer‑life; inverter power supply with high operating voltage.
HCFL (Hot-Cathode Fluorescent Lamp) 4.0–2205–7,000; significant heating.
Flat‑panel VFD light source (flat fluorescent tube), 200 mW/cm² or less; brighter and more uniform, with dual‑power supply driver.
EL (electroluminescent sheet) below 50 mW/cm², with a thickness of 5,000, good uniformity, short period, and low chromaticity.
OLED (organic light-emitting diode) — ultra-thin, with excellent uniformity, brighter, and a shorter lifespan.
FED (Flat-Panel Display Emission) is brighter than 10,000.

Keywords:

Backlight

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