Both large and small size displays can encounter variation in colour, luminance and flicker as a result of variations in production processes. Filtering or adjusting these optical characteristics early on in the production line saves time and increases yield and customer satisfaction. To ensure the end-product quality is up to a high standard it is advisable to test displays at several stages during the production process. Typical display tests include:
• Colour analysis, to ensure uniformity of colour reproduction of displays. • Flicker, testing and adjusting flicker supporting contrast min/max, contrast RMS, JEITA, VESA methods. • White point, adjusting white on displays in production settings. • Response time to determine a display’s reaction speed.
The table below gives an overview of different display measurements and corresponding measurement devices.
|White point adjustment||X||X||X||X||X|
|Contrast ratio analysis||X||X||X||X||X||X|
|Response time analysis||X||X||X||X|
For larger displays multiple spot measurements are often used. To control several measurement devices simultaneously a Medusa Device controller can be used.