Cyan Screen

How to use a cyan screen

A display mixes every color from red, green, and blue subpixels. Pure cyan, #00FFFF, turns the green and blue subpixels fully on and leaves red off. With two channels lit at once, a pixel that is missing one of them changes color in a way that is easy to see.

1. 1

   Open it full screen. Browser toolbars around the field hide the edges and corners, where faults often sit.

2. 2

   Turn off color filters. Night mode and blue-light filters reduce blue, which pushes cyan toward green.

3. 3

   Clean the display first. A speck of dust can look like a dark pixel. If it wipes away, it was not a fault.

4. 4

   Scan slowly. Work across the screen one section at a time from your usual distance.

What a cyan screen can reveal

A blue dot is a pixel whose green subpixel does not light, and a green dot is one whose blue subpixel does not light. A fully dark dot means neither lights.

A pale or white dot can be a pixel with its red subpixel stuck on.

Uneven tint, such as areas that lean toward green or blue, can point to uneven backlighting or panel variation. A small amount is normal on many displays, so check the manufacturer's warranty terms before deciding a panel is faulty.

Cyan and the red channel

Cyan is white without red. If the White Screen looks almost as cyan as this page across the whole display, the red channel may not be working. Check it directly with the Red Screen. The other two-color mixes are the Yellow Screen and the Magenta Screen. Confirm any dot that stays put with the Dead Pixel Test.

This screen's exact value has its own #00FFFF color page, with its RGB and HSL values and its contrast against black and white.