Ambient contrast ratio: why nits alone do not make a screen readable
Reflected light, not backlight output, decides whether a screen survives daylight. The arithmetic behind it, a nits ladder by scenario, and what buying brightness actually costs in power and lifetime.
Read →PCAP vs resistive touch: what actually decides it
Two sensing methods, one decision: what touches the screen, where the panel ends up and how long the front surface has to stay readable. Numbers, cost index and the failure modes we get called about.
Read →0.88 mm bezel video wall: when it is worth the extra 35 percent
A comparison of 0.88, 1.7 and 3.5 mm video wall bezels by viewing distance, with price index and the wall flatness each one needs.
Read →How close can people sit to an LED wall? The pitch formula we actually use
Every buyer asks for the smallest pixel pitch. Almost nobody asks what their room can actually show. Here is the arithmetic, worked through on three real rooms.
Read →Outdoor LED brightness: why 5000 nits is not always better than 6500
Brightness sells, but too much of it costs power, heat and lamp life. A table by sun exposure, plus the one setting most installations get wrong.
Read →1920 Hz or 3840 Hz? What the camera sees that your eye does not
Both screens look identical in the room. Then someone films the event and one of them has black bands rolling through it. Here is why, and how to test before you buy.
Read →14-bit or 16-bit grey scale: the spec you can actually see in a dark room
Grey scale numbers get copied from datasheet to datasheet. On a dark stage, the difference between 14 and 16 bit is the difference between a smooth gradient and visible steps.
Read →How much power does an LED wall really draw? Work it out from three numbers
The datasheet gives a maximum that nobody runs at. Here is the arithmetic for a real bill, done on a 30 square metre outdoor wall.
Read →Opened a 55-inch video wall panel: edge-lit versus direct-lit, side by side
Same external dimensions, same 500 nits on the label, and a 9 mm difference in depth. We took both apart to show where the light comes from.
Read →20-point touch, 8 ms response: which of those numbers changes how the screen feels?
Two panels with identical specs feel completely different to use. The difference is usually not the touch point count. Here is what to look at instead.
Read →50,000 hours means half brightness, not death: reading LED lifetime numbers
Every datasheet says 100,000 hours. Every buyer assumes that means ten years of perfect picture. Neither is true. What the number actually measures, and how to plan for year eight.
Read →Outdoor digital totem, IP65, two monsoons: what was wet inside
A unit pulled from service and opened on the bench. The front glass was dry. The cable gland, the breather valve and the fan louvre were not.
Read →GOB coating: we scratched two LED modules so you can see what it does
One module coated, one bare. Same panel, same pitch. We hit both with a key, spilled water on both, and then looked at the surface under a loupe.
Read →Flight information displays: the four requirements that are not about the screen
Airport FIDS looks like a display problem. It is mostly a redundancy, timing and legibility problem. A spec list from working on terminal projects.
Read →Stadium perimeter LED: why the refresh rate matters more than the brightness
A perimeter board is on television for ninety minutes. If it bands on camera, the sponsor sees it before the crowd does. Specs that actually matter for broadcast.
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