Continued from Sony Unveils LED Display With High Contrast Ratio (2)
In addition to the improvement of black occupancy, Sony expanded viewing angle, part of which is accounted for by the wide light distribution of LEDs.
In general, current LED displays have a problem of high cost. One of the reasons is the mounting method of LED chips. In the case of existing LED displays, RGB LED chips are packaged, and the package is used as a pixel. Therefore, it is necessary to produce RGB LED chips and mount them in a package, increasing cost.
Though Sony did not disclose the details, the company seems to have increased the mounting efficiency of LED chips to cut costs by taking some measures such as mounting LED chips equivalent to multiple pixels at once.
200-inch 4k display
A "cell" is made by using 120 (vertical) x 80 (horizontal) Ultrafine LEDs. And the ZRD-1, which has a resolution of 360 (vertical) x 320 (horizontal), consists of 3 (vertical) x 4 (horizontal) cells.
When a large-size display is made by arranging multiple units of the ZRD-1, the "ZRCT-100" display controller is used. Up to 72 units can be connected per controller. The maximum input resolution is 3,840 (horizontal) x 2,160 (vertical) when 12 x 6 units of the ZRD-1 are used. And up to 20 units of the controller can be synchronized.
Sony took two major measures so that no joint can be seen when a large screen is formed by combining multiple units. First, a pixel pitch of 1.2mm was ensured even across two adjacent units. Second, a technology to compensate a slight variation of video display among units was introduced.
For the future, Sony is considering supporting 3D display, curved screen, HDR (high dynamic range), etc while preparing for the commercialization scheduled in 2017.