NEC MultiSync LCD1920NX User And Service Manual

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NEC MultiSync LCD1920NX User And Service Manual Manual pdf 75 page image

5-172. External inspection on the LCD module2.1 External inspection of the display surfaceThe display surface shall be visually inspected according to the inspection items specified below. In casesof the discovery of extreme defects or doubtful judgment, final judgment should be made on the basis ofrelevant detailed standards for inspection.Unless otherwise specified, the inspection signals shall be used at the timing of Signal 25 specified inParagraph 1.2.8 herein. However, the inspection screen shall be arranged according to the “Instructions 1)to 5) of the Inspection Standard” set forth in Paragraph 2.1.2 (1).2.1.1 Inspection items1) Examination of the missing of lines (horizontal or vertical lines failing to be displayed).2) Presence of extreme missing of dots (bright dots and black dots), or conspicuous ones.3) Presence of extreme flaws, wrinkles, air bubble, dents, lint, foreign matter, and conspicuousabnormality on the display surface.2.1.2 Inspection standardsInspection standards for external appearance and display conditions(1) Inspection standardsUse a fluorescent lamp of 20w1 (for the inspection of external appearance) or the display planeilluminance of 40 to 200lx (for the inspection of display conditions). Secure a distance of 35cm betweenthe eyes and the sample, and that of 20 to 30cm between the fluorescent lamp and the sample. Underthe above-mentioned conditions or better, inspections shall be carried out in the direction specifiedbelow.A: Angle of visibility for inspection (Right and left: 30°/Up and down: 20° to 0°)The direction of application shall be recorded in the column of direction. Inspection shall be carried out ata room temperature of 25 ± 5°C.The following screen shall be used for the inspection.1) All black or gray in 3 gradations2) 15-gradation dot checkers (R,G,B in single color each)3) 15-gradation dot checkers reversal screen4) All red, all green, or all blue screen in solid color each5) All white solid screen(2) Standards for display conditions and external appearance inspectionStandard for errors (defects)