Display · No. 12
Monitor Test
This monitor test runs a suite of fullscreen patterns so you can judge backlight bleed, banding, sharpness, and panel uniformity. It is built for checking a new display or diagnosing an existing one.
Open the suite, choose a pattern, and inspect the screen from your normal viewing position. Use a clean screen and your monitor's native resolution.
The suite covers solid colors, gradient ramps, sharpness patterns, gray uniformity, and contrast steps.
What the pattern suite covers
The suite groups patterns into solid colors, gradient ramps, sharpness tests, gray uniformity fields, and contrast steps. Solid white and black screens reveal bright or dark pixels and light leaking around the bezel, while the colored screens expose pixels that fail to show a color.
The gradient ramps check for banding, where a smooth fade breaks into visible stripes. The checkerboard and line pairs test sharpness and scaling, and the gray uniformity fields help you spot clouding, tinted patches, and darker corners across the panel.
Each pattern shows a short caption explaining what to look for, which you can hide once you know the goal. Inspect the screen from your normal viewing distance rather than pressing your face to the glass. Faults that only appear with your nose against the panel rarely matter in everyday use.
Reading the results and next steps
On the black pattern in a dim room, uneven glow along the edges is backlight bleed, and brighter corners are common on LCD panels. A faint glow that shifts as you move your head is often IPS glow rather than a fault, so change your angle before judging it.
Visible steps in a gradient point to banding, which can come from an eight bit panel, aggressive image processing, or a low color depth setting in your graphics options. Blurry or fringed edges on the sharpness patterns often mean the monitor is not running at its native resolution or that scaling is active.
Clouding and tinted patches on the gray fields indicate weak panel uniformity. If a new display shows heavy bleed, strong banding, or bad uniformity, photograph the pattern and consider an exchange while you are still inside the return window, since these traits usually will not improve.
Getting an accurate reading
A few habits make the test more reliable. Set the monitor to its native resolution so the sharpness patterns are not softened by scaling, and give the panel a few minutes to warm up before judging brightness and uniformity.
View backlight bleed and dark uniformity in a dim room, since a bright room hides edge glow. Turn off any dynamic contrast, sharpening, or motion smoothing features in the monitor menu so you are looking at the raw panel rather than processing.
If two monitors look different on the same pattern, the cause is often a settings difference rather than a fault. Match the resolution, refresh rate, and color depth in your graphics options before you conclude that one panel is worse than the other. A different cable type or port can also change how the same signal looks.
Frequently Asked Questions
- How do I test my monitor for backlight bleed
- Open the black pattern in this suite and view it in a dark room. Light leaking from the edges or corners is backlight bleed. Compare it against your normal viewing distance, since small amounts are common and only matter if they distract you during real use.
- What is monitor banding and how do I check for it
- Banding is when a smooth gradient breaks into visible stripes instead of fading evenly. Use the grayscale and color ramps in this test to spot it. Banding can come from an eight bit panel, image processing, or a low color depth setting in your graphics options.
- Is IPS glow the same as backlight bleed
- No. IPS glow is a soft glow that appears in the corners and shifts as you move your head, and it is normal for IPS panels. Backlight bleed is brighter, stays in place, and clusters along the edges. Change your viewing angle to tell them apart.
- Why does my screen look blurry on the sharpness patterns
- Blurry or fringed lines usually mean the monitor is not running at its native resolution or that scaling is active. Set the display to its native resolution in your system settings and disable extra sharpening. A loose or low quality cable can also soften the image.
- How do I check monitor uniformity
- Use the gray uniformity patterns and scan the whole panel for darker corners, tinted areas, or cloudy patches. Uneven brightness or color across a flat gray field means weak uniformity, which is a panel trait rather than a setting you can fully correct.
- Should I return a new monitor after testing it
- If the test reveals heavy backlight bleed, strong banding, or poor uniformity that bothers you, exchanging it early is reasonable, since these traits rarely improve. Photograph the pattern that shows the problem and check the seller return window and warranty terms before you decide.