http://www.tftcentral.co.uk/articles/led_backlighting.htmUniformity - Most desktop monitors use edge-lit W-LED backlighting with a line of LEDs along the edge of the panel. The whole screen is lit by means of a special diffuser, and so it is this which really determines the brightness uniformity you experience. The uniformity of brightness depends only on the design of the diffuser and you can often see various defects like bright spots or a brighter zone at the edge of the screen where the lamp or the line of LEDs resides. Having an LED backlight does not guarantee you better uniformity. In fact, good uniformity is harder to achieve in the long term as the LEDs age, with each LED possibly aging at a different rate. With RGB LED units, the use of three separate light sources for red, green, and blue means that the white point / colour temperature of the display can move as the LEDs age at different rates as well.
Uniformity - Most desktop monitors use edge-lit W-LED backlighting with a line of LEDs along the edge of the panel. The whole screen is lit by means of a special diffuser, and so it is this which really determines the brightness uniformity you experience. The uniformity of brightness depends only on the design of the diffuser and you can often see various defects like bright spots or a brighter zone at the edge of the screen where the lamp or the line of LEDs resides. Having an LED backlight does not guarantee you better uniformity. In fact, good uniformity is harder to achieve in the long term as the LEDs age, with each LED possibly aging at a different rate. With RGB LED units, the use of three separate light sources for red, green, and blue means that the white point / colour temperature of the display can move as the LEDs age at different rates as well.
An edge backlight with white LEDs (W-LEDs) - The LEDs are placed in a line along the edge of the matrix, and the uniform brightness of the screen is ensured by a special design of the diffuser. This backlight does not offer the option of zonal control over brightness like the direct lit method does (see below). It can not offer an extended color gamut either. Instead, it is economical and compact, which makes it popular among notebook makers and with manufacturers producing ultra-thin displays and keen to keep costs to a minimum. This is the variation commonly being used in desktop displays at the moment.
Modern displays and LCD TV's have progressed from having 4 sides lit by LED backlights to only 1 side. This helps reduce cost and improve efficiency.
Looking across all nine of these monitors, we can generalize and say that LEDs definitely look more dramatic. The blacks are deeper, the whites brighter, and the colors more vibrant. At the same time, we found LEDs more prone to skewing toward a given color and needing more calibration in order to remedy this. CCFL displays often look semi-lifeless when sitting next to an LED, but their colors appear more photo-realistic. CCFL definitely renders more detail in shadows because the blacks haven’t been pushed down as strongly. Yes, sometimes the measurement data contradicts this, but we’re going by side-by-side visual comparisons, and it’s important to weigh both.
Usually better and more consistent lighting.With a regular blacklight there's a centralized bulb and the corners usually get less light and are darker. The LED backlight monitor should be consistently bright regardless of the place on the screen you look.
Usually better and more consistent lighting.With a regular blacklight there's a centralized bulb and the corners usually get less light and are darker. The LED backlight monitor should be consistently bright regardless of the place on the screen you look.