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SEMI D32-0303 © SEMI 2003 6 NOTICE: SEMI makes no warranties or represen tations as to the suitability o f the standards set forth herein for any particular application . The determinati on of the suitability o f the sta…

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Figure 3
Mark Area Dimensions
Figure 4
Data Matrix Field
SEMI D32-0303 © SEMI 2003 6
NOTICE: SEMI makes no warranties or representations as to the suitability of the standards set forth herein for any
particular application. The determination of the suitability of the standard is solely the responsibility of the user.
Users are cautioned to refer to manufacturer' s instructions, product labels, product data sheets, and other relevant
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Copyright by SEMI® (Semiconductor Equipment and Materials
International), 3081 Zanker Road, San Jose, CA 95134. Reproduction o
f
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SEMI D33-0703 © SEMI 2003 1
SEMI D33-0703
MEASURING METHOD OF OPTICAL CHARACTERISTICS FOR
BACKLIGHT UNIT
This method was technically approved by the Global Flat Panel Display Committee and is the direct
responsibility of the Japanese FPD Materials and Components Committee. Current edition approved by the
Japanese Regional Standards Committee on April 28, 2003. Initially available at www.semi.org May 2003;
to be published July 2003.
1 Purpose
1.1 The electro optical characteristics of backlight unit
(BLU) have a great influence on the characteristics of
LCD like uniformity, luminance and chromaticity etc.
There are many measurement methods for BLU of
electro optical characteristics. It is so different that the
measurement method for BLU in each company (e.g.:
the testing position, test condition, equipment concept
etc.). Therefore, this standard will present the general
measurement method.
2 Scope
2.1 This standard is applicable to BLU for Liquid
Crystal Display (LCD) and the measurement includes
only the optical area. The other areas (Electric
characteristics, Reliability, and so forth) are dealt with
by other SEMI standards.
NOTICE: This standard does not purport to address
safety issues, if any, associated with its use. It is the
responsibility of the users of this standard to establish
appropriate safety and health practices and determine
the applicability of regulatory or other limitations prior
to use.
3 Limitations
3.1 This standard does not include the test of each BLU
component such as: light guide panel, optical film, Cold
Cathode Fluorescent Lamp (CCFL), film
characteristics, and etc.
4 Referenced Standards
4.1 Other Standards
Flat Panel Display Measurement Standard, VESA
FPDM 2.0, June 2001.
Commission Internationale de l’Eclairage (CIE),
“Colorimetry of Self-Luminous Displays-A
Bibliography,” CIE Publication No. 87, 1990.
Commission Internationale de l’Eclairage (CIE),
“Colorimetry,” CIE Publication No. 15.2, 1986.
NOTICE: Unless otherwise indicated, all documents
cited shall be the latest published versions.
5 Terminology
None.
6 The Optical Measurement Method
6.1 The test result of BLU can vary because of the
environment and measurement conditions. Therefore,
the measurement environment and conditions need to
be determined.
6.2 Measurement Setup
6.2.1 Environment conditions:
• Temperature: 25 ± 2°C
• Humidity: 65 ± 20% RH
• Illumination of surrounding: dark room below 10
lux
• Air flow: no wind
6.2.2 Measurement Conditions
6.2.2.1 The measuring distance is suitable for
500 ± 50 mm at field aperture 1° and the viewing
direction of all tests are 90° ± 1°. This distance is
applied for all measurements in this standard.
90º±1º
500±50mm
Backlight Unit
LMD
Figure 1
The Measuring Configuration for Measuring
Optical Characteristics of BLU
6.2.2.2 Electrical conditions for driving are the typical
lamp current and typical operating frequency. A
nonconductor for jig of BLU is needed and it must be
ground treated to reduce each noise signal.