External Inspection On The Lcd Module; External Inspection Of The Display Surface; Inspection Items; Inspection Standards - NEC MultiSync LCD1920NX User And Service Manual

2. External inspection on the LCD module

2.1 External inspection of the display surface

The display surface shall be visually inspected according to the inspection items specified below. In cases
of the discovery of extreme defects or doubtful judgment, final judgment should be made on the basis of
relevant detailed standards for inspection.
Unless otherwise specified, the inspection signals shall be used at the timing of Signal 25 specified in
Paragraph 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 items

1) 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 conspicuous
abnormality on the display surface.

2.1.2 Inspection standards

Inspection standards for external appearance and display conditions
(1) Inspection standards
Use a fluorescent lamp of 20w1 (for the inspection of external appearance) or the display plane
illuminance of 40 to 200lx (for the inspection of display conditions). Secure a distance of 35cm between
the eyes and the sample, and that of 20 to 30cm between the fluorescent lamp and the sample. Under
the above-mentioned conditions or better, inspections shall be carried out in the direction specified
below.
A: Angle of visibility for inspection (Right and left: 30
The direction of application shall be recorded in the column of direction. Inspection shall be carried out at
a room temperature of 25 ± 5
The following screen shall be used for the inspection.
1) All black or gray in 3 gradations
2) 15-gradation dot checkers (R,G,B in single color each)
3) 15-gradation dot checkers reversal screen
4) All red, all green, or all blue screen in solid color each
5) All white solid screen
(2) Standards for display conditions and external appearance inspection
Standard for errors (defects)
°
C.
5-17
° °
/Up and down: 20 to 0
°
)