デッドピクセルテスト & 輝点修復ツール
ドット抜けや輝点、バックライト漏れ、均一性をチェック・修復するプロ向けツール。
輝点修復ツールの使い方:
- 見つける: 「画面テストを開始」ボタンで輝点（明るい点）を見つけます。
- 移動: 修復ツールを起動し、点滅ボックスを輝点の上にドラッグします。
- 待機: 10〜20分間そのままにします。高速な色変化が液晶の固着を改善します。（モバイルでは全画面モードを使用）
精密なカラーテスト
全画面カラーを切り替えてドット抜けや輝点を発見。
グレースケールと均一性
バックライト漏れ、IPSグロー、バンディングを可視化。
ピクセル修復モード
アニメーションパターンで輝点の改善を試みます。
安全で簡単
ダウンロード不要。デスクトップとモバイルで利用可能。
What is a Dead Pixel Test?
A dead pixel test displays solid colors across your screen to identify defective pixels on monitors, laptops, TVs, and mobile devices. By cycling through white, black, red, green, and blue, you can spot dead pixels (permanently black), stuck pixels (fixed color), or backlight bleed. This browser-based test requires no installation—just open the page and start testing instantly on any device.
How This Online Screen Test Works
Our screen test uses your browser's fullscreen API to display solid colors across your entire monitor. When you click 'Start Screen Test', the tool cycles through pure colors (white, black, red, green, blue, cyan, magenta, yellow) one by one. Each color is rendered at maximum saturation to make pixel defects visible. You examine the display on each color—dead pixels appear as black spots, stuck pixels show as fixed color dots. All processing happens in your browser with no data collection.
Accuracy and Limitations
This browser-based test accurately reveals most visible pixel defects when viewed in a dark room at maximum brightness. However, there are limitations: Very small sub-pixel defects may be hard to see without magnification. Backlight bleed is easier to spot on dark backgrounds. Color accuracy depends on your monitor's calibration. For warranty claims, manufacturers may require specific testing conditions or their own diagnostic tools.
How to Interpret Your Results
Dead Pixels
Dead pixels appear as permanently black dots that don't change color regardless of the displayed image. They are usually permanent hardware defects. Multiple dead pixels may qualify for warranty replacement.
Stuck Pixels
Stuck pixels remain fixed on one color (red, green, or blue) and don't respond to image changes. Unlike dead pixels, stuck pixels can sometimes be fixed using our Stuck Pixel Fixer tool.
Backlight Bleed
Light bleeding from screen edges visible on dark colors indicates backlight bleed. Minor bleed is common on LCD/LED monitors. Severe bleed that affects normal viewing may warrant replacement.
デッドピクセルテストFAQ
画面テストとピクセル不良に関するよくある質問。
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About This Test
Methodology: Our testing methodology uses standard Web APIs (Fullscreen API, Canvas) that are supported by all modern browsers. Tests are designed for accuracy and repeatability.
About: HardwareTest provides free, privacy-first hardware diagnostics. All tests run entirely in your browser with no data collection.
Disclaimer: This tool provides visual pixel inspection only. Results may vary based on viewing angle, brightness settings, and ambient lighting. For warranty claims, consult your monitor manufacturer's testing requirements.