Transflective filters were an alternative, but they were ineffective in bright environments. Today, thanks to the introduction of LED backlights, all these problems have been minimized or even eliminated, with added advantages in image quality, particularly in terms of contrast.
Many more advantages than conventional tubes.
The main differences between cold cathode fluorescent tubes (CCFLs) and LEDs are shown in Table I.
Basically, we are talking about a drastic reduction in energy consumption, a longer lifespan, reaching up to 100,000 hours in some cases, a considerable improvement in dynamic contrast, and better brightness quality. This is why LED backlighting is becoming increasingly popular in both the consumer and industrial markets.
Who controls the backlight?
Until now, we were familiar with the typical inverter used to control our cold cathode fluorescent tubes. This component is no longer used in newer LED backlights, as these are now controlled by internally or externally installed DC-DC regulators. Figure 2 shows an LED driver for controlling an edge-mounted backlight.
What types of backlights are available?
Basically, there are two main types: Edge (Figure 3), which involves placing one or more LEDs along the side of the display. This type includes a diffuser that evenly distributes the light generated by the LEDs. Array (Figure 4) is characterized by the installation of an array of LEDs across the entire surface of the backlight, which must align with the display's viewing area. This system consumes more energy than Edge because it typically uses significantly more LEDs.
What can Tempel offer its customers?
Tempel GROUP offers a wide range of high-brightness LED-based panels. We have solutions in open frame, panel mount, rack, stainless steel, and custom chassis integration kits. Our screens have numerous applications, from toll systems, outdoor kiosks, and transportation displays to outdoor monitoring systems and information screens, among others.
