IEC 61747-6-2:2011

Overview

IEC 61747-6-2:2011 specifies standardized measurement methods for reflective liquid crystal display (LCD) modules. Published by the International Electrotechnical Commission (IEC), this standard details quality assessment procedures, inspection requirements, and precise test methods needed for the reliable evaluation of reflective-type LCD modules. It aims to ensure that quality control, product testing, and performance specifications are both accurate and globally uniform by defining procedure-dependent parameters and measurement conditions.

Reflective LCD modules are widely used in electronic devices for their ability to utilize ambient light, making their optical properties highly dependent on environmental factors. Accurate measurement, as outlined in this standard, is crucial for maintaining consistent performance and quality across different manufacturing batches and suppliers.

Key Topics

The standard covers a variety of important aspects in measuring and assessing reflective LCD modules:

• Quality Assessment Procedures

  • Screening sequences
  • Sampling requirements
  • Inspection criteria

• Measurement Methods

  • Procedures for measuring optical and electrical properties
  • Standard geometries for illumination (directional, conical, hemispherical)
  • Use of precise light measuring devices (LMDs)
  • Calibration and traceability of equipment

• Critical Parameters

  • Reflectance (photometric evaluation)
  • Contrast ratio
  • Viewing angle and direction
  • Chromaticity and colorimetric data
  • Electro-optical response (including transfer function)
  • Lateral and temporal variations
  • Electrical characteristics (e.g., power consumption)

• Measurement Set-Up

  • Arrangement of equipment and display under test (DUT)
  • Positioning and alignment for accurate data
  • Control of ambient conditions and unwanted reflections

Applications

IEC 61747-6-2:2011 is essential for manufacturers, quality assurance professionals, and laboratories involved in the development and production of reflective LCD modules. Key application areas include:

• Product Development: Ensures that new reflective LCD modules meet industry standards for optical and electrical performance.
• Quality Control: Provides repeatable measurement benchmarks for comparing LCD modules from different production batches or suppliers.
• Compliance Testing: Helps organizations demonstrate conformity to international standards for performance claims and market entry.
• OEM & Integration: Supports evaluation of third-party components in complex electronic assemblies.
• Procurement: Enables informed purchasing decisions through comparable and reliable specification data.

By implementing the specified methods, manufacturers can minimize measurement variations due to environmental and instrumental factors, leading to more consistent display performance and customer satisfaction.

Related Standards

IEC 61747-6-2:2011 is part of the broader IEC 61747 series covering liquid crystal display devices. Additional relevant standards include:

• IEC 61747 Series: Comprehensive coverage for various types of LCD modules, including transmissive and transflective types.
• ISO 11664-2:2007: Colorimetry - CIE standard illuminants, vital for uniform color measurement.
• CIE Standards such as CIE 15.2, 17.4, 38, 1931, and 1976: References on color spaces, lighting vocabulary, and photometric/ radiometric measurement, essential for accurate assessment of display properties.

Practical Value

Adhering to IEC 61747-6-2:2011 enables organizations to:

• Benchmark reflective LCD performance using standardized, internationally recognized procedures
• Enhance product reliability through rigorous, repeatable measurement and evaluation methods
• Consistently meet customer and regulatory expectations for display quality
• Facilitate product certification and global market access by demonstrating compliance with international standards

For any entity involved in the design, production, or procurement of reflective LCD modules, following IEC 61747-6-2:2011 ensures high quality, reproducibility, and competitiveness in today’s display technology market.