Make the difference

LED SCREENS INDOOR, OUTDOOR & LCD DISPLAYS

Main differences between innovative solutions for effective and attractive communication

What's LED ?

A LED display is a flat-panel video display that employs an arrangement of light-releasing diodes as pixels. Due to their brilliance, these devices can even be utilized outside, where any visual output is apparent even in sunlight — for store signage and billboards. Modern computer displays use a mix of LCDs and LEDs to illuminate the display regardless of ambient lighting conditions.

LED stands for light-emitting diode; when current travels through such diodes, it produces light. In the semiconductor material within an LED, electrons reunite with electron holes, emitting energy as photons. This is the foundational principle of LEDs and LED screens.

LEDs have several benefits compared to incandescent light systems, such as reduced power consumption, longer lifespan, enhanced physical durability, smaller size, and quicker switching.

The LEDs on an LED display are tightly spaced. By adjusting the luminosity of every LED, the diodes collectively produce a picture on display.

To generate a vibrant color image, the concepts of additive color mixing are used, in which new colors are made by combining various colors of light. A LED display comprises red, green, and blue LEDs arranged in a predetermined pattern. These three hues come together to create a pixel. A LED device can create billions of colors by altering the diode’s intensity. When seen from a fixed distance, the arrangement of colored pixels on an LED display appears as an image.

In 1927, the first LED was invented by the Russian inventor Oleg Losev. Only infrared, red, and yellow LEDs were implementable for many years. These diodes were used in various gadgets - from remotes to alarm clocks.

In 1994, the Japanese physicist Shuji Nakamura developed a functional blue LED. Soon after, green and white LEDs emerged, setting the groundwork for the boom of LED applications in illumination and screen technologies.

What's LCD ?

LCD, or “liquid crystal display,” refers to a flat display technology that is often used in computer monitors, instrument panels, cellular phones, video cameras, televisions, laptops, tablets, and calculators. These display devices support high-resolution image quality. LCDs supplanted the earlier cathode-ray tube (CRT) display technology; however, other display technologies, such as light-emitting diodes (LEDs), have begun replacing LCDs in recent years.

LCDs are often seen on laptop computers and are available as active-matrix and passive-matrix displays. The RCA Laboratories in Princeton, New Jersey, invented the LCD in 1964. 1970 saw the discovery of the twisted-nematic (TN) method of operation, which brought LCD to mainstream applications. Initially, LCD manufacturers offered small screens for portable items like watches and calculators.

Using a thin-film-transistor (TFT) array, Sharp Corporation presented a 14-inch active-matrix full-color, full-motion screen in 1988. Consequently, Japanese manufacturers like Hitachi established a bonafide — and eventually, burgeoning — LCD business. Personal computers were the first to adopt large LCD screens, followed by television receivers.

LCDs utilize an active or passive matrix for their display grid. Active-matrix LCDs are frequently referred to as thin-film transistor (TFT) displays. A passive matrix LCD comprises a matrix of conductors containing pixels at each junction. A current is delivered through two conductors in the matrix to regulate the light for each pixel.

A transistor is situated at every pixel intersection in an active matrix, using a lower current to adjust the brightness of a pixel. Therefore, the power in an active-matrix screen may be turned on and off more often, enhancing the panel’s refresh rate.