The LCD monitor panel isn't just a slab of glass that lights up when a high frequency electric current passes through it. It has a complicated array of in-built electronics, each of which has its own life span.
One of the main components of the panel, the CCFL backlight lasts up to 20 months (15,000 hrs). In comparison, the LCD glass itself lasts almost 6 years (50,000 hrs)
CCFL tube (cold cathode fluorescent lamp) is the most commonly used backlight in modern-day LCD monitors.
Like all electronic components, the ones soldered into an LCD monitor screen too have an indicative lifespan. While components continue to function even after their rated lifespan is over, their performance degrades by over 50%. - Under the normal operating conditions of temperature, humidity & handling LCD electronics have a lifespan of around 100,000 hrs (12 years). It's the same with the LED backlight as well.
- However, the CCFL backlight lasts 15,000 hrs before it loses 50% of its brightness.
- The EL (electroluminescent) backlight lasts about 10,000 hrs depending on the make, brand and quality.
As explained in the LCD electronics course, that EL is different from CCFL, which has a higher life span. Most modern LCD panels use CCFL backlight tube.
Though LCD backlight is expected to last 4-7 years without problems, some tubes start dimming as early as 1-2 years.
A number of factors contribute to backlight failure: - voltage fluctuation & brownout
- cheap parts / fake parts / used parts
- humidity & heat
- (in rare cases) a quality or manufacturing defect
Since the CCFL backlight lights up the screen, losing it will cause the screen to dim, and hence, it is a weak electronic link in the overall usability of a LCD monitor.
Here are some facts about the LCD backlight bulb: - A backlight is a thin fluorescent tube that lights up the LCD screen
- Most backlights are either EL (electroluminescent) or CCFL (cold cathode fluorescent lamp)
- A new backlight tube has a life span from 5,000-15,000 hours of usage before it loses 50% of its brightness.
