Definition Of Pixel Defects; Inspection Introduction; Mechanical Inspection - Dell 2707WFP Service Manual

27" LCD Color Monitor

4.5 Definition of Pixel Defects

LTM270M1-L01

4.5.1 Inspection Introduction

Conditions
viewing distance 35 ~ 50 cm
ambient illumination 300 ~ 700 Lux (normally 500 Lux)
ambient temperature 25 + - 5 'C
viewing angle The surface of the module and the inspector's
line of view shall be at 90 degrees(TN) 90±45 (PVA)
display pattern Pure R, G, B, Black, White, Dot Gray pattern
inspection area Active area
Defect Modes
dark / bright spots
points on the display which appear dark / bright and remain unchanged in size
dark / bright lines
lines on the display which appear dark / bright and remain unchanged in size
polarizer scratch
when the unit is lit a light, line is seen across a darker background; line does not vary in size
polarizer dent
when the unit is lit a light, light(white) spots appear against a darker background, and do not vary in size
bright/dark dot
a sub-pixel (R, G, B dot) stuck off / on

4.5.2 Mechanical Inspection

Chassis Gap
Silicone Gasket (Glue)
Light Leakage
* If there is none identified criteria in this specification, Samsung will refer production
specification that Customer and Samsung agreed. (ex. Screen misalignment, Bezel deformed, etc)
* If there is mechanical dimension issue which has no designated tolerance, Samsung will
apply natural tolerance.
max. 0.7mm
silicone material shall not be exposed beyond the metal
frame edge into the view area
there shall be no visible light around the edges of the
Screen.
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Dell 2707WFP