Introduction to On-Site LCD Screen Testing
If you’ve ever bought a replacement smartphone LCD or checked a batch of screens before installation, you know one thing: what looks fine at first glance might be hiding some serious defects. On-site LCD testing is a fast, no-lab-needed way to check display quality and avoid costly installation mistakes.
The three most effective on-the-spot tests are the Metoda czystego koloru, the Test w skali szarości, i Test dynamiczny. These methods don’t require expensive tools — just some prepared test images and a sharp pair of eyes.
Tools and Preparations for LCD Testing
Before diving in, make sure you have:
- A smartphone or tester that can display your test images.
- High-resolution pure color and gradient images stored locally (or via a testing app).
- A bright, evenly lit environment without direct sunlight glare.
- Clean hands or gloves — fingerprints can interfere with spotting defects.
Pure Color Detection Method
What is the Pure Color Test?
The pure color test is like shining a flashlight into the soul of an LCD. You fill the entire screen with one solid color at a time and look for pixel defects or color inconsistencies.
Colors Used for Testing
The standard lineup is Czerwony, Zielony, Niebieski, Biały, I Czarny — together they reveal most visual defects.
- Czerwony, Zielony, Niebieski: Detect dead pixels or stuck sub-pixels.
- Biały: Shows yellowing or uneven backlight.
- Czarny: Reveals light leakage or bright spots.
Step-by-Step Pure Color Testing Process
- Open the pure color test image (full screen).
- Check edge-to-edge for odd-colored pixels or spots.
- Switch to the next color and repeat.
How to Interpret the Results
- Perfect result: Uniform color with no bright/dark dots.
- Defective: Każde miejsce, które nie pasuje do otoczenia.
Typowe problemy występujące podczas testowania Pure Color
- Martwe piksele: Zawsze czarny, bez względu na kolor.
- Zablokowane piksele: Zawsze czerwony, zielony, lub niebieski.
- Niespójność kolorów: Nierówne obszary tonów.
Test skali szarości dla jakości wyświetlacza LCD
Co to jest test skali szarości?
Testowanie skali szarości sprawdza zdolność ekranu do stopniowego wyświetlania zmian z ciemnego na jasny bez widocznych stopni.
. 5% Do 95% Zasada gradientu
Idealny obraz testowy pochodzi z 5% szary do 95% szary gładko. Wyświetli się słaby wyświetlacz LCD bandażowanie — nagłe skoki zamiast płynnego zanikania.
Jak wykryć pasma lub nieciągłości
Przyjrzyj się uważnie gradientowi. Jeśli potrafisz policzyć „kroki” lub zobaczyć ostre przejścia, to oznaka złej jakości panelu.
Przyczyny defektów skali szarości
- Układ scalony sterownika wyświetlacza o niskiej głębi bitowej.
- Zła kalibracja ze strony producenta.
- Inconsistent backlight performance.
Dynamic Testing for Motion Performance
Purpose of Dynamic Testing
This checks how well the LCD handles movement. If scrolling looks smeared or flickers, that’s a red flag.
How to Perform a Scrolling Text Test
- Open a page of black text on a white background.
- Scroll quickly up and down.
- Watch for any delay or trails behind the text.
Signs of Ghosting, Motion Blur, and Flicker
- Ghosting: Shadows follow moving text.
- Motion Blur: Text becomes unreadable during movement.
- Flicker: Rapid brightness changes during motion.
Possible Hardware and Software Causes
- Low refresh rate or slow pixel response time.
- Faulty display driver chip.
- Incompatibility with device firmware.
Comparing the Three Testing Methods
- Pure Color Test: Best for detecting pixel defects and light leakage.
- Test w skali szarości: Best for revealing poor tonal range.
- Test dynamiczny: Best for checking movement clarity.
For best results, use all three in sequence.
Common LCD Defects Found in On-Site Tests
- Dead/Stuck Pixels: Visible under pure color test.
- Uneven Backlight: Seen on white/black screens.
- Banding: Found in grayscale test.
- Ghosting: Detected in dynamic test.
Pro Tips for On-Site LCD Inspection
- Perform tests indoors under neutral lighting.
- Use a magnifying glass for stubborn pixel checks.
- Save test images in your phone gallery for quick access.
Avoiding Misjudgment
Not every display flaw means a hardware defect — some are software-related. Always retest on a second device if possible before rejecting a panel.
Wniosek
On-site LCD testing using pure color detection, grayscale gradients, I dynamic scrolling is fast, niezawodny, and saves both time and money. With just a few test images and a careful eye, you can catch most display defects before installation — preventing customer complaints and returns.
FAQ
1. Can I do these tests without special equipment?
Tak, just use a smartphone and preloaded test images.
2. What’s the biggest giveaway of a low-quality LCD?
Banding in grayscale and ghosting during motion are common signs.
3. Do OLED screens need the same tests?
Mostly yes, but OLED issues like burn-in require additional checks.
4. How long should a full test take?
Around 3–5 minutes if you’re well prepared.
5. Are dead pixels repairable?
Some stuck pixels can be fixed with pixel-refresh apps, but dead pixels are permanent.
