Technical Specs

20
LG CDT Spec.
Limits of Screen and Faceplate Blemish
1. Test Procedure
Set up the tube and adjust the light output on a blank raster at the center of the screen for
approximately 15 FL and C.I.E x = 0.281, y = 0.311 (or x = 0.313, y = 0.329) color coordinate.
The screen should be viewed at the minimum distance of 60 cm (2 feet).
Ambient light level at the tube face should be approximately 5.0 Lux.
In the non-operating condition the screen may be viewed under high level, single-source incandescent
light of 700 to 1,000 lux measured at the faceplate surface.
The size of a round blemish is equal to its diameter. The size of an irregularly shaped blemish is equal
to its equivalent diameter, defined as the average of the major and minor axis.
2. Quality area
Zone
Zone A Zone B
Tube size
Rectangle area concentric
with the center of screen
Remained useful screen area
41 cm 300mm x 225mm Remained area
3. Phosphor screen blemishes
3.1 The criteria of blemish classification
Category Contents of blemish
Entire defects Blank Spot
50% or more of complete dot is missing
Partial defects 25 to 49% of complete dot is missing
Other defects Non-uniformity lighted part