Definition Of Pixel Defects - Dell E178WFPC Service Manual

17" LCD Color Monitor

4.5 Definition of Pixel Defects

4.5.1 Inspection environment conditions:
◆ Room temperature: 20 ~ 25 C
◆ Humidity: 65 ± 5% RH.
◆ Illumination: Fluorescent light (Day-Light Type) display surface illumination to be 300 ~ 700 Lux. (standard
500Lux.)
◆ To be a distance about 35±5 cm in front of LCD unit, viewing line should be perpendicular to the surface of the
module judge the visual appearance with human's eyes. (Stand up the panel for judge and ±30° viewing edge
will be allowed)
◆ Take off the protection film of polarizer while judging the display area.
◆ If there is any question while judging, check the panel again in operating mode.
4.5.2. Display Defect Requirements
1. Max. 0 red, green or blue bright dots (sub-pixels), max. 0 green dots, max. 0 joined bright dot, min. distance
between 2 bright dots: 10 mm. Bright dots are tested with full screen black pattern (R.G.B. = 0, 0, 0)
2. Max. 4 black dots. Max. 2 joined (2 adjacent) black dots, no defect with 3 adjacent black dots. Min. distance
between 2 black dots: 10mm.Black dots are tested with full screen white (R.G.B. = 255,255,255)/ red (R.G.B. = 255,
0, 0)/green (R.G.B. = 0, 255, 0)/blue (R.G.B. = 0, 0,255) pattern.
3. Total amount of Dot Defects are 5 Max. (Including bright and dark dot defects)
20
Dell E178WFPC