Acer AL1716 AL1716W Service Guide - Page 9

8 ACER AL1716W Go to cover page 2. Flat Panel Specification (continued) 2.5.6 Smudges, Streaks and Smears: When viewing the panel oriented so as to max. reflected light, there shall be no visible smudging, streaking, smearing or other non-uniformity from contaminants, fingerprints, or defects in any of the visible surfaces. This is independent of whether the unit is operating or off. 2.5.7 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. Table 4. Descriptive Terms Average Diameter Smaller of (L+W)/2 or L/20 + 2W < 0.1mm 0.1mm- 0.3mm 0.31mm- 0.5mm 0.51mm- 1.25mm 1.26mm- 2.5mm 2.51mm- 0.3mm Greater than 3.75mm Acceptable Number Non countable 10 10 5 3 3 None MinimumSeparation N/ A 15mm 15mm 15mm 25.4mm 25.4mm Not applicable Allowable distance between spots of two sizes is the minimum separation number for the smaller spot. Therefore, if there are two spots including 1.30mm and 0.4mm in diameter, they must be at least 15mm apart. 2.6 Optical Characteristics: 2.6.1 Brightness uniformity: The uniformity is determined by using a photometer (CA-210) to measure the 9 points luminance in front of monitor after at least 30 minutes warm up. It shall be test at 1440x900/60Hz mode and full white square pattern with contrast / brightness in default value. The values specified are at an approximate distance 20 cm from the LCD surface and at 0 viewing angle. The 9 test points are defined as below. Brightness uniformity ≧70％ Remark: The black luminance non-uniformity are no defined by panel spec, therefore, we don't define the specification for black luminance non-uniformity. 2.6.2 Contrast ratio (CR): The contrast ratio is determined by using a photometer (CA-210) to measure the maximum and minimum luminance in front of monitor after at least 30 minutes warm up. It shall be test at 1440x900, 60Hz mode and full white and full black square pattern with contrast and brightness in default value whcih specified are at an approximate distance 20cm from the LCD surface and at 0 viewing angle. The contrast ratio is calculated as below. CR=(Max. full white luminance)/(Max. full black luminance) CR = 500: 1(ty) 2.6.3 Response time: The response time is defined as below. Tr + Tf : 8 msec typ. Remark: optical response time vs gray scale, test condition for brightness set to max. and contrast set to default. 2.6.4 Viewing angles: The viewing angles are measured at CR>10 as below. The brightness uniformity is calculated as below: Horizontal Left: 70 degrees typ. (HSD170MGW1-A); Right: 70 degrees typ. (HSD170MGW1-A); Vertical Up:65 degrees typ. (HSD170MGW1-A); Down:65 degrees typ. (HSD170MGW1-A);