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TBD
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41
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42
ENGINEERING
Documentation
Revision:
1.6
Date:
24-May-17
Title:
TND540 Requirement
Proprietary and Confidential
This document contains confidential and property information which belongs to Rand McNally, Inc. This
document may not be copied, reproduced, or transmitted to others in any manner, nor may any use of the
information on this document be made, except for the specific purposes for which it is transmitted to the
recipient without prior written consent of Rand McNally, Inc.
document may not be copied, reproduced, or transmitted to others in any manner, nor may any use of the
information on this document be made, except for the specific purposes for which it is transmitted to the
recipient without prior written consent of Rand McNally, Inc.
7
Notes
7.1 Display Brightness and Uniformity
The methods of testing backlight brightness (luminance) and uniformity are defined below. Measurements shall
be performed with a full white pattern on the display using a (TBD) Luminance Meter (Model xxxxx or equivalent).
The display should be operating for at least 10 minutes prior to test to ensure stability of the backlight and stray
light on the display or into the luminance meter should be avoided.
be performed with a full white pattern on the display using a (TBD) Luminance Meter (Model xxxxx or equivalent).
The display should be operating for at least 10 minutes prior to test to ensure stability of the backlight and stray
light on the display or into the luminance meter should be avoided.
Figure 7.1 – Display Measurement Points
7.1.1
Brightness
Brightness or luminance is determined using the 5-spot method. This consists of measuring the luminance
perpendicular to the screen at 5 specific points (P1, P3, P5, P7, P9). The average of three measurements at each
point will be combined and divided by the number of points to obtain the average brightness. This value should be
equal to or greater than 343 nits as specified herein.
point will be combined and divided by the number of points to obtain the average brightness. This value should be
equal to or greater than 343 nits as specified herein.