About

This is not just a color flasher; it is a comprehensive display analysis environment designed to expose the microscopic flaws in modern panels. Whether inspecting a factory-fresh 4K monitor, evaluating a used smartphone, or diagnosing a flickering TV, screen uniformity is the primary indicator of hardware health.

This tool bypasses the operating system's color profiles where possible to render raw RGB data. It includes specialized patterns for detecting IPS Glow, OLED Banding, and Motion Ghosting. Furthermore, it features a JSSnow engine - a high-frequency noise generator intended to unstick liquid crystals by rapidly alternating voltage states across the sub-pixel matrix.

Formulas

Pixel density and response time are the critical metrics for display quality. The perceived sharpness is governed by PPI (Pixels Per Inch), while motion clarity depends on the Grey-to-Grey (GtG) transition time.

Refresh Period T = 1000Hz ms

If the pixel response time R_t is greater than the refresh period T, ghosting occurs.

{

Ghosting: R_t > TClear: R_t ≤ T

For defect classification, we follow a strict boolean check for sub-pixels:

State(p) = TRUE if Input ≠ Output

Reference Data

Test Pattern	Target Defect	Tech Logic	Detection Strategy
RGB Solids	Dead / Stuck Pixels	I ∈ {0, 255}	Look for black dots on Red/Green/Blue or colored dots on Black.
CMY Solids	Sub-pixel Balance	C = G+B	Reveals weak sub-pixels that function but lack brightness.
Black Uniformity	Backlight Bleed	Lum → 0	Inspect edges/corners for light leakage (Clouding).
Grey Ramps	OLED Banding / Burn-in	Gamma ≈ 2.2	Look for faint shadows of old UI elements or vertical bands.
1px Grid	Geometry / Scaling	1:1 Mapping	Check for blurry lines, indicating non-native resolution scaling.
Static Noise	Stuck Pixel Repair	rand(t) × 60Hz	High-speed switching attempts to "massage" the transistor.
Motion Box	Ghosting / Response	dx/dt	Watch the trailing edge of the moving square for blur.

Frequently Asked Questions

Navigate to the "Repair" section in the tool and select "Static Noise". Place the noisy area over the stuck pixel. Leave it running for 10-20 minutes. The rapid random switching of colors can sometimes stimulate the liquid crystal transistor to unstuck itself. Note: This does not fix dead (black) pixels, only stuck (colored) ones.

This is likely "Backlight Bleed" or "IPS Glow". It is common in LED/LCD monitors where the backlight is not perfectly blocked by the liquid crystals. Minor glow in corners is normal; large bright blotches indicate a defect or poor panel pressure.

The White test checks for maximum brightness uniformity (looking for yellowing or dim spots). The 5% or 10% Grey test is crucial for OLED screens to detect "Burn-in" (permanent retention of static images like taskbars) and "Vertical Banding" (manufacturing defects in voltage regulation).

The standard color cycling tests are completely safe. The "Repair/Noise" mode creates high-contrast flickering. While safe for the monitor, it may trigger photosensitive epilepsy in humans. Use the repair mode with caution and look away from the screen.

iOS WebKit restricts the Fullscreen API. The tool automatically detects this and expands to the maximum available viewport size (100vh) instead. Hide your browser address bar by scrolling or using the "AA" menu to enter "Hide Toolbar" mode for best results.