IEC 62679-3-2 Electronic paper display -Part 3-2: Measuring method-Electro-optical

This part of IEC 62679 series is restricted to electronic paper display modules using either segment, passive, or active matrix, and either monochromatic, or colour type displays.

In order to achieve a useful and uniform description of the performance of these devices, specifications for commonly accepted relevant parameters are put forward.

The purpose of this part of IEC 62679 series is to indicate and list the procedure-dependent parameters and to prescribe the specific methods and conditions that are to be used for their uniform numerical determination.

Abbreviations

DUT-Device under test

LMD-Light measuring device

PWM-Pulse width modulation

General

It is intended that the future IEC 62679-3-1 will cover the proper illumination method and optical measurement method to evaluate the electro-optical property of electronic paper display modules.

If an electronic paper display module works in combination with an external touch-key-panel or an external front-light-unit, remove those for measuring. If it is not possible to remove these elements, this fact shall be mentioned. However, it is not necessary to mention the protective sheet.

It is assumed that all measurements are performed by personnel skilled in the general art of radiometric and electrical measurements as the purpose of this paper is not to give a detailed account of good practice in electrical and optical experimental physics. Furthermore, it is necessary to ensure that all equipment is suitably calibrated as is known to skilled personnel and that records of the calibration data and traceability are kept.

It is assumed that all measurements are performed under normal operation conditions as used in the finished product by the end user unless requested otherwise. This includes the driving signals (waveforms) of the electronic paper display panel and/or module.

NOTE An electronic paper display module consists of an electronic paper display panel (electro-optical material,back plane, and driving circuit) and a logic circuit (see Figure 4).

Measuring equipment

Luminance meter: the devices for measuring luminance can be realized by

a spectro-radiometer with numerical V() correction

a photometer with filter adaption to V()

where V() is the photopic response, as defined by the CIE 1931 standard observer in CIE/ISO 10527: 1991

Colorimeter: devices for measuring colour can be realized by spectro-radiometer with numerical evaluation (spectrophotometer),filter-colorimeter

LISUN following instruments fully meet IEC 62679-3-2 Electronic paper display -Part 3-2: Measuring method-Electro-optical:

XYL-VI Luminance Colorimeter

LS-ELF 2D Video Luminance Meter

LSG-1890B High Precision Rotation Luminaire Goniophotometer