Continued from Sony Unveils LED Display With High Contrast Ratio (1)
Moreover, the contrast ratio of LED displays can be easily improved, and their power consumption can be drastically lowered, compared with LCD displays, because they emit light without a backlight unit. Also, compared with OLED displays, which also emit light by themselves, LEDs are advantageous in terms of service life and reliability because they can be composed of inorganic materials.
Contrast ratio of 1,000,000:1
Because of those features, LED displays have already started to be commercialized as large-size products for B-to-B applications. And various manufacturers have released products. Compared with such competitors, Sony's product features a high contrast ratio, wide viewing angle and wide color gamut, the company said.
The contrast ratio of the "ZRD-1" display unit, which has a screen size of 403 x 453mm and a pixel count of 360 (vertical) x 320 (horizontal), is 1,000,000:1. Its viewing angle, color gamut and brightness are almost 180°, about 140% of the sRGB color space and up to about 1,000cd/m2, respectively. Also, its power consumption is about 200W at the maximum brightness.
The contrast ratio of the ZRD-1 is high because the size of the light source (a red, green or blue LED used as a pixel) is as small as 0.003mm2. Sony calls it "Ultrafine LED."
Sony improved contrast ratio by reducing light source size and increasing the ratio of black color on the entire screen (black occupancy) to 99% or higher. In the case of conventional LED displays made by mounting red (R), green (G) and blue (B) LED chips in a surface-mounted SMD package, the black occupancy is about 30-40%, the company said.