All screen test tools

    Local Dimming & Blooming Test for Mini LED and LCD

    Inspect blooming and local dimming on a Mini LED or LCD display. Move a bright square, circle or subtitle across black and compare your TV’s dimming settings.

    • Moving bright targets on pure black
    • Square, circle and subtitle patterns
    • Adjustable size, signal and speed
    • Full screen with keyboard and touch controls

    Moving bright-target test for local dimming and blooming

    The signal slider changes RGB values, not the display’s measured brightness. Keep observations brief and compare with everyday content.

    How to use

    1. Dim the room, reduce reflections and use your normal viewing position. Keep picture mode and brightness steady.
    2. Start the full-screen test. Hide the controls and watch the area around the moving bright target, especially near edges.
    3. Pause the target or enable pointer control to inspect a particular area. Compare local dimming settings on the display while keeping this pattern unchanged.
    4. Check real subtitles and dark film scenes afterward. Note halos, delayed brightness changes or lost dark detail; compare what distracts you in normal use.

    What to keep in mind

    This is an SDR visual pattern. It cannot count backlight zones, measure peak brightness or certify HDR performance. Browser scaling, picture processing, viewing angle and room reflections affect what you see. OLED has no LCD backlight zones; reflections or optical scatter can still look like halos.

    Questions

    How do I check blooming on a Mini LED TV?

    Move a small bright target over black, then compare subtitles in actual content. Look for a lighter halo outside the target or a visible trail as dimming zones change. Keep the viewing position and display settings consistent.

    Does this local dimming test measure zone count or HDR brightness?

    No. It provides controllable SDR patterns for your own observations. A browser cannot reliably infer hardware zone count, HDR luminance or dimming response time from this animation.

    Is blooming the same as backlight bleed or OLED burn-in?

    No. Blooming follows a bright object as nearby LCD backlight zones illuminate. Backlight bleed is usually fixed near edges, while burn-in is a persistent image-shaped change. Compare other tests and normal content before drawing conclusions.

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