Acer RA19WAANU Service Manual download pdf (Page 8)

1.4.5.5 Defect Terminology

Table 3 gives the descriptive terms used in classifying

defects.

1.5 Optical Characteristics

Depends on the LCD supplier's spec. Details refer to QA

Inspection Spec.

1.4.5.6 Smudges, Streaks and Smears

When viewing the panel oriented so as to maximize

reflected light , there shall be no visible smudging ,

streaking, smearing or other nonuniformity from

contaminants ,fingerprints,or defects in any of the visible

surfaces. This is independent of whether the unit is

operating or off .

1.4.5.7 Other Defects

Undefined defects that are considered to be rejectable

by Lite–On will be reviewed by Lite-On as they become

apparent. These panels will be referred to the Lite - On

Corporate / Manufacturer Purchasing Agreement for

disposition.

1.4.5.8 LCD Inspection

Put LCD panel on inspection table and illuminate the

panel with a daylight fluorescent lamp located above the

panel surface such that the luminance at the LCD panel

is between 1000 lux and 1500 lux .Defect limits are given

in Table 4 .

1. Product Specification (continued)

Average Diameter smaller of

(L+W)/2 or L/20+2W

Acceptable Number Minimum Separation

< 0.1mm Non countable N / A

0.1 mm ~ 0.3 mm 10 15 mm

0.31 mm ~ 0.5 mm 10 15 mm

0.51 mm ~ 1.25 mm 5 15 mm

1.26 mm ~ 2.5 mm 3 25.4 mm

2.51 mm ~ 3.75 mm 3 25.4 mm

Greater than 3.75 mm NONE Not applicable

Note : Allowable distance between spots of two sizes is the minimum separation

number for the smaller spot. Therefore, if there are two spots, 1.30mm and 0.4mm

indiameter,theymustbeatleast15mmapart.

Dark / Spots / Lines

Spots or lines that appear dark in the display patterns and are

usually the result of contam ination. D efects do not vary in

siz e o r inten sity (co ntrast) w h en co ntrast vo ltag e is v aried .

Contrast variation can be achieved through the use of varying

gray shade patterns.

Bright Spots / Lines

Spots or lines that appear light in the display patterns.

D efects do not vary in size or intensity (contrast) w hen

contrast voltage is varied. C ontrast variation can be achieved

through the use of varying gray shade patterns.

Polarizer Scratch

W hen the u n it ligh ts, lin es a pp ear lig ht (w hite ) w ith d isp lay

patterns dark and do not vary in size. Physical dam age to the

polarizer that does not dam age the glass

Polarizer Dent

W hen the unit lights, spots appear light (white) with display

patterns dark and do not vary in size. Physical dam age to the

polarizer that does not dam age the glass.

R u bb ing L ine

H orizontal or diagonal lines that appear gray w ith the display

patterns dark and m ay have resulted from an “out of control”

rubbing process on the polyim ide or “waves” on the B EFs or

prism sheets.

N ewton R ing The “rainbow ” effect caused by non-uniform cell thickness.

Mottling

W hen the u n it ligh ts, v ariatio n / n on – u n ifo rm ity

(sp lotch in ess) ap pea rs lig ht (w h ite) w ith th e d isp lay a n d

mightvary in size.

Dim Line

W hen the u n it ligh ts, lin e(s) in th e m o n ito r (v ertica l) or m a jor

(horizontal) axis appear dim , but not com pletely on or off.

Cross Lines Off

W hen the u n it ligh ts, lin es in b oth the m ino r an d m ajo r ax is

do not appear.

Bright / D ark D ot A sub – pixel (R,G ,B dot) stuck off / on (electrical).

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