Acer H236HL, Service Manual

Page: 16 / 59

14
Surface luminance with all white pixels
Contrast ratio = ---------------------------------------------------------
Surface luminance with all black pixels
1.5.3 Response time:
Response time is the time required for the display to transition from black to white (Decay Time, Tr
D
) and from
white to black (Rise Time, Tr
R
)
The sampling rate is 2,500 sample/sec. For additional information see FIG. 9.
The response time is defined as the following figure and shall be measured by switching the input signal for
each gray to gray.
1.5.4 Viewing angles:
Viewing angle is the angle at which the contrast ratio is greater than 10 or 5. The angles are
determined for the horizontal or x axis and the vertical or y axis with respect to the z axis which is
normal to the LCD surface. For more information see FIG. 8.
1.6 Environmental Requirements:
Operating Storage
Temperature: 0°C - +40°C -20°C - +60°C
Humidity: 15% - 90% 15% - 90%
Altitude: 12,000 feet (3,658m) 40,000 feet (12,192m)