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チェッカーボードテストツール

チェッカーボードパターンでモニターのシャープネス、ピクセル応答性、サブピクセルレイアウトをテスト。無料。

チェッカーボードテスト
チェッカーボードパターンでモニターのシャープネス、ピクセル応答性、サブピクセルレイアウトをテスト。無料。
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Tests sub-pixel rendering at 2px grid
Reveals dead or stuck pixels instantly
Click anywhere to exit fullscreen

チェッカーボードテストは、モニターのピクセルシャープネスと応答性を評価するツールです。白黒の交互パターンを表示し、各ピクセルの境界が鮮明に表示されているかを確認します。

このテストはモニターのネイティブ解像度での動作確認に特に有効です。スケーリングが不適切な場合やケーブル品質の問題がある場合、チェッカーボードパターンにぼやけやモアレが見えます。

Why Should You Run This Test?

A checkerboard pattern is the most demanding test for pixel-level sharpness. Every single pixel must be distinctly black or white — if your display is running at a non-native resolution, using poor scaling, or has a faulty display cable, the checkerboard will immediately look blurry, moiré-patterned, or gray instead of crisp.

Common Symptoms This Test Catches

  • Text looks fuzzy or slightly out of focus
  • Fine details in images appear soft or smeared
  • Screen looks sharp in the center but blurry at edges
  • Certain areas of the screen have a colored tint that shouldn't be there

What Causes a Blurry or Distorted Checkerboard?

Resolution & Scaling Issues

  • Non-native resolution — If your OS is set to a resolution that doesn't match your monitor's native resolution, pixels are interpolated and the checkerboard will look soft or gray.
  • Display scaling above 100% — Windows/macOS scaling (125%, 150%) can blur pixel-level patterns. This is expected behavior but indicates your apps may not be pixel-perfect.

Cable & Connection Issues

  • VGA/analog cable — Analog signals introduce noise and blur. Use digital connections (DisplayPort, HDMI, USB-C).
  • Damaged or low-quality cable — A faulty cable can cause sparkle, blur, or intermittent pixel issues.

Hardware Defects

  • Dead or stuck pixels — Individual pixels that don't respond will stand out dramatically against the alternating pattern.
  • Sub-pixel rendering issues — If sub-pixels are misaligned, you'll see colored fringes on the black/white edges.

How to Read Your Results

✅ Crisp, distinct black and white pixels — Your display is running at its native resolution with a good digital connection. Pixel-level rendering is working correctly.

⚠️ Pattern appears slightly gray or has moiré effects — Your display is likely running at a non-native resolution or is using display scaling. Check your OS display settings and ensure the resolution matches your monitor's native spec.

❌ Blurry, soft, or has colored artifacts — There may be a cable issue (try a different cable), your resolution is wrong, or there is a hardware defect. Check: 1) Display resolution, 2) Cable type/quality, 3) GPU output settings.

How to Fix Checkerboard Issues

  • Set native resolution — Right-click desktop → Display Settings → Resolution. Choose the resolution marked "Recommended" — this is your panel's native resolution.
  • Switch to digital cable — Replace VGA with DisplayPort, HDMI, or USB-C. Digital connections are pixel-perfect.
  • Set scaling to 100% — For pixel-perfect testing, temporarily set display scaling to 100% (Settings → Display → Scale).
  • Check for overscan — Some TVs/monitors crop or scale the image. Disable overscan in your TV settings or GPU driver.
  • Try a different cable — If the pattern has sparkle or intermittent artifacts, the cable may be faulty.
  • Update GPU drivers — Outdated drivers can cause rendering issues at the pixel level.

reference_results

✅ Good Result — Crisp Checkerboard

When viewed close-up, you should see perfectly alternating black and white squares at the pixel level. From normal viewing distance, the pattern should appear as a uniform medium gray — this means every pixel is rendering correctly and your resolution is native.

⚠️ Mediocre Result — Moiré Pattern

Instead of uniform gray, you see wavy, shimmering patterns or uneven brightness areas. This is called moiré and typically indicates your display is running at a non-native resolution, causing pixel interpolation.

❌ Bad Result — Blurry or Tinted

The pattern looks soft, smeared, or has colored fringes (pink, green, or blue edges). This indicates a cable issue (analog VGA signal), incorrect resolution, or sub-pixel rendering problems.

よくある質問 – チェッカーボードテスト

ピクセルのシャープネス、応答性、サブピクセルレイアウトの品質を確認できます。ぼやけやモアレパターンは問題を示しています。

モニターがネイティブ解像度で表示されていない、ケーブル品質の問題、または画像処理（シャープネスフィルター）が原因の可能性があります。

ディスプレイの解像度とパターンの周波数の干渉により発生します。ネイティブ解像度での表示を確認してください。

はい。テレビのシャープネス設定やオーバースキャン設定を調整する際に、チェッカーボードパターンが参考になります。

当ツールでは標準的な1ピクセルのチェッカーボードを表示し、最高精度のシャープネステストを提供します。

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Quick Screen Health Check

How did your screen perform?

How did the checkerboard pattern appear?