IEC 62977-2-1 pdf download

IEC 62977-2-1 pdf download.Electronic displays – Part 2-1: Measurements of optical characteristics – Fundamental measurements
1 Scope
This part of IEC 62977 specifies standard measurement conditions and measuring methods for determining the optical characteristics of electronic display modules and systems. These methods apply to emissive and transmissive direct view displays that render real 2D images on a flat panel. This document evaluates the optical characteristics of these displays under darkroom conditions. This document applies to the testing of display performance in response to standard analogue or digital input signals that are not absolute luminance encoded. The input signal is relative RGB without metadata information that codes for real luminance, colour space or colour coordinates. These methods are limited to input signals with typical OETFs such as defined in IEC 61966-2-1, ITU BT. Rec. 601, ITU BT. Rec.709, and ITU BT. Rec.2020. The tests in this document are not approved for use with HDR input signals. NOTE A flat panel or flat panel display is a display with a flat surface and minimal depth that emits visible light from the surface. The display is subdivided into an array of electronically driven pixels which can be light valves modulating a backlight, or self-luminous. Emissive/transmissive/reflective hybrid displays can be flat panel or flat panel displays.
3 Terms, definitions and abbreviated terms
Terms and definitions 3.1 For the purposes of this document, the terms and definitions given in IEC 60050-845 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • • IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp 3.1.1 signal pixel smallest encoded picture element in the input image Note 1 to entry: Signal pixel is defined as the unit of signal resolution. 3.1.2 pre-gamma average picture level average input level of all signal pixels relative to an equivalent white pixel driven by a digital RGB input Note 1 to entry: Unless otherwise stated, the pre-gamma average picture level (APL) will simply be referred to as average picture level in this document. Note 2 to entry: The APL will normally be expressed as a percentage, where a full white screen at maximum drive level would be 100 % APL. Note 3 to entry: The pre-gamma APL is also called gamma-corrected APL in IEC 62087-2 [4]. In addition, it is noted that the tone rendering curve may not have a power law function with a well-defined exponent (gamma). 3.1.3 APL loading influence of average picture level on display performance, for example luminance 3.1.4 chromaticity difference geometric distance between two colour coordinates in a CIE chromaticity diagram, usually the CIE 1976 chromaticity diagram 3.1.5 chromaticity gamut area colour gamut area maximum area of chromaticity reproducible by a display Note 1 to entry: “Colour gamut area” has been used in textbooks, industry, and the market for a long time. However, the CIE (eilv.cie.co.at) indicates that the term “colour gamut” should be regarded as a volume in a colour space. Therefore, a two-dimensional representation should be described as a chromaticity gamut area. 3.1.6 direct view non-projection display technology where the image rendering surface is viewed directly without any optical components between the viewer and the surface
4 General
4.1 Measured basic quantities The basic quantities for luminance and chromaticity can be measured directly, for example with photometers and colorimeters, or they can be obtained from measured spectra (i.e. the spectral power distribution (SPD)) by a spectroradiometer. Spectroradiometers are generally more accurate than photometers or colorimeters, and should be used when higher accuracy is needed. Photometers and colorimeters allow for fast data acquisition as required for evaluation of optical transitions (e.g. “switching times”). The acquisition of the spectral power distribution is usually restricted to steady optical states. 4.2 Electrical driving of the display (depending on the nature of the display) The electrical driving conditions of the display are as follows: – driving voltage (waveform), current, frequency, etc.; – RGB input (analogue, digital); – test pattern (independent of display electrical interface).