HP DreamColor LP2480zx Professional Monitor User's Guide

1 Understanding pixel defects in LCD monitors Bob Myers Displays Business Unit Last revised: July 1, 2009 Introduction...

10 Development, the world's leading organization for quality and environmental certification.  Energy savings: HP LCD monitors include advanced

11 For more information For the HP sales office nearest you, please refer to your local phone directory, or call the HP regional office listed below.

2 Introduction Liquid crystal display (LCD) technology was first invented decades ago and has been improving ever since—to the point that today’s high

3 Understanding TFT-LCD technology Thin-film transistor (TFT) technology refers to a type of liquid crystal display (LCD), also known as an active-mat

4 The advent of thin-film transistor (TFT) technology allowed transistors to be placed at each picture element or sub-pixel. These can switch very qui

5 How to spot a sub-pixel defect Due to their tiny size relative to the screen, defective sub-pixels can be extremely hard to see. A defect in a sub-p

6 Table 2. This policy applies for HP monitors manufactured in May 2009 or later: Bright sub-pixel defects: 2 maximum Dark sub-pixel defects: 5 ma

7 defects, and no sub-pixel defects spaced closer than 15 mm, with a maximum of five total sub-pixel defects. Figure 2. Pixel fault definitions.

8 Defect type definitions Bright/dark dot: A sub-pixel stuck on or off. Bright spots/lines: Spots or lines that appear light in the display. Defects d

9 The HP advantage The HP pixel defect specifications are part of HP’s ongoing effort to provide high quality products. When it comes to LCD-TFT displ