Acer AL2002 AL2002 Service Guide - Page 14

13 Go to cover page 4.5.2. Display Degradation Over the life of the product, variation of the parameters specified in Panel specification shall be maintained within reasonable limits. The panel must not exhibit any significant defects while in operation (excluding the CCFL operation). This does not in any way change the warranty given by the panel manufacturer. 4.5.3. Light Leakage Except for the active display area, there shall be no light emission visible from any angle from any other part of the display. For this test, the ambient illumination will follow the panel specification 300 to 700 lux. 4.5.4. Allowable Defects No cosmetic defects are allowed except those specified below. The conditions of visual inspections are as follows: ; Viewing distance is to be approximately 35cm. ; Ambient illumination is to be 300 to 500 lux. ; Viewing angle range shall be 160 degrees Horizontal and 160 degrees vertical typically.(AMLCD) ; Defects not apparent within one minute shall be ignored. 4.5.5. Defect Terminology Below table is the descriptive terms used in classifying defects. Dark Spots/Lines Spots or lines that appear dark in the display patterns and are usually the result of contamination. Defects do not vary in size or intensity (contrast) when contrast voltage is varied. Contrast variation can be achieved through the use of varying gray shade patterns. Bright Spots/Lines Spots or lines appear light in the display patterns. Defects do not vary in size or intensity (contrast) when contrast voltage is varied. Contrast variation can be achieved through the use of varying gray shade patterns. Polarizer Scratch When the unit lights, lines appear light (white) with display patterns dark and do not vary in size. Physical damage to the polarizer does not damage the glass. Polarizer Dent When the unit lights, spots appear light (white) with display patterns dark and do not vary in size. Physical damage to the polarizer that does not damage the glass. Rubbing Line Horizontal or diagonal lines that appear gray with the display patterns dark and may have resulted from an " out of control " rubbing process on the polyimide or " waves " on the BEFs or prism sheets . Newton Ring The "rainbow" effect caused by non-uniform cell thickness. Mottling When the unit lights, variation / non - uniformity (splotchiness) appears light (white) with the display and might vary in size. Dim Line When the unit lights, line(s) in the minor (vertical) or major (horizontal) axis appear dim, but not completely on or off. Cross Lines Off When the unit lights , lines in both the minor and major axis do not appear. Bright / Dark Dot A sub - pixel (R, G, B dot) stuck off / on (electrical).