Sixteen-region screen record
No affected regions marked yet; the diagram will show selected locations.
Backlight Bleed Test
Use a full-screen black display to inspect edge and corner bright spots, then record the conditions, severity, and affected regions.
Test conditions and region record
Records the current display setting only; the page does not change hardware brightness.
Choose the result of a visual observation under fixed conditions; this is not an instrument measurement.
The display stays pure black in full screen; press Esc after observing to exit.
Record affected regions
After exiting full screen, choose the region corresponding to a fixed bright spot. The buttons support keyboard input.
Start with the full-screen observation, then record severity and affected regions.
Observation record
Not complete
Choose an observation severity; affected regions can be marked in the sixteen-region map on the left.
- Marked regions
- 0
- Brightness record
- 30%
- Environment
- Dark room
- Distance and angle
- 60 cm · 0°
This tool records visual observation only. It cannot measure bleed brightness, control panel backlight, or automatically determine a manufacturer service standard.
Affected-region distribution
Learn more
Use and interpret the result
- Set the display to its normal viewing brightness and enter the brightness record.
- Choose a dark or dim environment and record viewing distance and angle.
- Enter the full-screen black display, observe it, and press Esc to exit.
- Mark fixed bright spots on the region map, choose a severity, and copy the record.
Method and validation boundary
The tool shows a pure-black background through the browser full-screen API and records the locations the user observes with a sixteen-region map. It does not read display brightness data or automatically identify backlight bleed.
For comparison, keep brightness and environment fixed, then change viewing distance or angle. Fixed edge spots and angle-dependent glow should be recorded as separate observations.
Scope and limitations
This tool is intended for backlit LCD and Mini LED displays; OLED does not have traditional backlight bleed. Automatic camera exposure can exaggerate dark-area bright spots. For service decisions, follow the device manufacturer policy or professional measurement.
How do I tell backlight bleed from IPS glow?
Backlight bleed is usually fixed at an edge or corner and changes little when the viewing angle changes. IPS glow often changes with angle and distance. Keep brightness and environment fixed and repeat the observation from different distances and angles.
Does a bright spot at the screen edge count as backlight bleed?
Do not conclude from one view alone. First check whether the spot remains fixed on the pure-black display, then change distance and angle to rule out reflections and IPS glow.
Why does a phone camera show more bleed than my eyes?
Night mode and automatic exposure can lift dark areas and enlarge subtle bright spots. A photo is useful for recording location, but the severity should be based on a visual result under fixed conditions.
Tool information
This tool runs locally in the browser. Test conditions, severity, and region marks are not uploaded; clipboard access is used only after the user chooses Copy.
This tool is implemented with standalone HTML, CSS, and JavaScript and includes no third-party runtime library.