LCD Pixel Inversion Test
Show high-frequency alternating pixel patterns and record visible flicker, scan lines, or pixel-walk effects on an LCD.
Test settings
Pixel pattern and observation
Use a modern browser with Canvas support for a pixel-level test.
Record the current visual effect only; the page does not diagnose hardware.
- Pattern
- One-pixel checkerboard
- Cell
- 1 px
- Gray pair
- 96 / 160
- Phase
- Phase A
- Readiness
- 0/4
- Canvas backing
- —
The page cannot read the panel's inversion scheme. Compare several patterns and gray pairs and rule out scaling, sharpening, and camera moire.
Separating inversion effects from other artifacts
| Phenomenon | Typical appearance | How to cross-check |
|---|---|---|
| Inversion-related flicker | Stable flicker, scan lines, or pixel walk with a particular checkerboard or fine-line pattern. | Switch phase, pattern, and gray pair; see whether it is limited to certain combinations. |
| Scaling resampling | Soft edges or irregular wide stripes that change when the scale changes. | Restore native resolution, 100% zoom, and PC mode. |
| Camera moire | Color waves or moving stripes visible only through a phone or camera. | Use direct visual observation; do not substitute a recording for the physical screen. |
| Backlight or temporal flicker | Brightness cycles visible across many pages, not only pixel-sensitive patterns. | Use a separate flicker or backlight-strobe test to compare. |
Learn more
Test flow and keyboard shortcuts
Confirm native resolution and 100% zoom, then start with a middle gray pair. In fullscreen, cycle through checkerboard, row, column, and block patterns. Arrows change pattern and tones; P changes phase. View each combination briefly.
How the pattern is generated
Canvas creates a backing surface based on device pixel ratio with smoothing disabled. Two fixed gray values alternate by pixel or small cell; phase B swaps their positions. The page outputs the pattern but does not read the panel driver.
Scope and safety
This is a visual screen, not a repair diagnosis. OLED behavior should not be explained with LCD inversion. Camera moire, scaling, browser resampling, sharpening, and link processing can create false clues. Stop if uncomfortable.
Privacy and implementation
Patterns and observation records are generated locally. No input is uploaded, no third-party runtime API is called, and nothing is written to local storage.
Frequently asked questions
What is LCD Pixel Walk?
It is a flicker, scanline, or moving-pixel sensation that can occur with high-frequency alternating patterns and may involve LCD polarity inversion, voltage balance, and resampling.
Does visible flicker mean the display is defective?
Not necessarily. Panel sensitivity, scaling, sharpening, and moire can exaggerate it. Compare several patterns and gray pairs rather than treating this page as a fault certificate.
Why use native resolution and 100% zoom?
The test depends on precise pixel placement. Scaling and resampling change the checkerboard and line structure.
What if the pattern feels uncomfortable?
Exit fullscreen and stop immediately. Do not stare at high-frequency patterns or use them as a continuously playing image.