Why purple filter

Сравнение между виолетов и обикновен прозрачен филтър

Most of the devices we are producing, are equipped with a super bright red LED displays, with various digit number. We use a special dark purple filter in front of the displays. That way we achieve higher contrast and readability of the displayed value, no matter of surrounding light. This eliminates in most cases the well-known problem of reading LED display when direct sun light is applied to it. The difference between normal display with transparent front cover and one with dark purple front cover is illustrated very well on the figure. The advantage of dark purple front filter is obvious.