certification mark

Certification mark for low blue light mode performance

Adding value with our service portfolio

Adding value with our service portfolio

CERTIFICATION MARK FOR LOW BLUE LIGHT MODE PERFORMANCE 

 

  

 

SCOPE:

The certification mark applies to LED backlit LCD display, LED display and those displays on Information Technology equipment and Audio-Visual apparatus and their display module, and Domestic Image Projector (RG0/1/2).

 

BASIS OF CERTIFICATION (TEST REQUIREMENTS):

The certification mark is awarded within the framework of voluntary testing and certification. The test procedure developed by TÜV SÜD is based on various criteria including IEC 62471, IEC 62471-5, ISO 9241-305 and ISO 9241-307 standards.

 

KEY STATEMENTS OF THE CERTIFICATION MARK:

 

 

  • Low Blue Light Mode Performance
    • As LEDs and other blue-rich solid state light sources becoming dominated in domestic and workplace lighting, people are spending more and more time staring at TVs, displays, mobile phones and projected images, blue light exposures are gradually increased and hazardous effect of Blu-rays on ocular is becoming an important concern.
    • Though Low Blue Light Mode is designed on reducing blue light ratio of images presented by products, yellowish issue of images is appearing when blue light ratio is reduced which may result in visual fatigue of users.
    • To address the visual side effects when taking beneficial from blue light ratio reduction, correlated colour temperature of white and colour gamut are taken into consideration during Low Blue Light Mode Performance measurement, in order to optimize yellowish issue when blue light ratio is reduced under low blue light mode defined by manufacturer.
  • Blue Light Ratio
    • Blue light ratio is evaluated under specific low blue light mode of the product defined by manufacturer, in comparison to default/pre-shipped/standard mode.
    • The ratio is defined as blue light irradiance/radiance (integrated over the wavelength range from 400 to 500 nm) over total irradiance/radiance (integrated over the wavelength range from 300 to 700 nm).
  • Colour Temperature (White) ≥ 5000K
    • Correlated colour temperature of white is evaluated under specific low blue light mode of the product defined by manufacturer.
    • White image with correlated colour temperature greater than 5000K is generally considered as daylight white which prevents visual fatigue when working with images presented by products.
  • Gamut Retained Ratio ≥ 95%
    • Colour gamuts are evaluated under both default/pre-shipped/standard mode and specific low blue light mode of the product defined by manufacturer.
    • The Gamut Retained ratio is defined as the ratio of colour gamut under low blue light mode over colour gamut under default/pre-shipped/standard mode.
    • To avoid poor image quality shown in low blue light mode, colour gamut shall not change too much between modes.
  • Visual Ergonomics (ISO 9241-307)
    • TVs, displays, mobile phones, image projectors and other products incorporated with display panels are widespread in modern society, if image quality of products are poor or adjustability of products are not possible, users may work in awkward postures which results physical discomfort like visual fatigue, neck, shoulder or back pains, furthermore, working efficiency is significantly reduced.
    • Comfort and efficiency can be improved by ensuring that products are complied with requirements of visual ergonomics In consideration of user and product interaction includes image qualities, adjustability, environmental effects, etc.

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