A slanted line with a with of one display pixel is used to evaluate the resolution
LMK Display Resolution – Reproducible resolution measurement of displays
Two methods, one goal: precise analysis of display resolution
The LMK Display Resolution software is part of the display package and enables the effective image resolution of a display to be evaluated in comparison with the input signal. It is used to characterize the “loss of image sharpness” or the perceived resolution. The package includes two powerful methods based on luminance measurements with high optical maginfication lenses: Pixel Crosstalk and Slanted Line MTF. We recommend both algorithms for different applications.
COMPARISON OF BOTH METHODS
Learn more about measurement conditions and the advantages and disadvantages of each method in our technical article (external link) or contact us here.
Slanted Line MTF
Slanted Line MTF is an IEC-62977-3-6 (external link) standardized and fast way to measure the resolution capability of a display. The fundamentals of the evaluation algorithms are based on the publication "Line-Based Modulation Transfer Function Measurement of Pixelated Displays," (external link) by Kenichiro Masaoka and base on the well-established ISO12233 slanted edge evaluation, which is used to characterize the MTF (Modulation Transfer Function) of optical elements.
Features
- Standardized according to IEC 62977-3-6
- Calibration takes lens MTF into account
- Suitable for flat-panel displays
- Sampling condition: We recommend more than 10 camera pixels per display pixel
- Only suitable for virtual images to a limited extent
Single display pixels are used to evaluate the resolution
Pixel Crosstalk
Pixel Crosstalk evaluates resolution by analyzing the scattering profile of individual display pixels. A crosstalk is calculated as a percentage in the vertical and horizontal directions and across the entire field of view. It is based on the publication "Pixel Crosstalk: A New Metric to Characterize DOI Loss Due to AG Treatments of Display Glasses" (external link).
Features:
- Ideal for virtual images such as HUDs and AR/VR
- Requires at least 30 camera pixels per display pixel
- Not suitable for irregular subpixel layouts
Lens selection for resolution measurements
Different lenses are used depending on the display type.:
- Standarddisplays: (z. B. Smartphones, Laptops, Monitore): Macro lenses with a magnification of 0,5–2×
- Microdisplays: Microscopic lenses with a magnification of 5–20×
- Near-Eye-Displays (NED): Specially designed AR/VR NED-lenses with a narrow field of view
RELEVANT PRODUCTS AND APPLICATIONS
Downloads
Publications
Invited Paper: Reproducible Characterization of Microdisplays using Imaging Luminance Measurement Devices (ILMDs)
International Conference on Display Technology (ICDT 2024)
In this contribution, we present typical practical implications of high magnification lenses required for camera-based microdisplay measurements and analyze their impact on existing measurement methods for DeMURA, resolution and contrast. Furthermore, we show hardware and software-based methods to improve or handle the shortcomings of these high-magnification lenses.
Reproducibility Evaluations and Calibration Sensitivity of Slanted Line Display MTF Measurements in Oversampling Conditions
International Display Workshop (IDW 2023)
In this contribution we research calibration related impacts on MTF measurements using the Slanted Line approach in oversampling conditions. Based on this we propose a simplified workflow of the Slanted Line MTF method and conclude benefits and limitations of these setup conditions.
Resolution Capability Measurements: A Comparison Between MTF Slanted Line and Pixel Crosstalk
Society for Information Display 2023
In this contribution, we qualitatively and quantitively compare the recently proposed slanted line MTF resolution measurement with the established pixel crosstalk resolution measurement. This is done by comparing evaluation results and reproducibility from measurements of nine different samples in three different setups for each method.
Reproducibility and Sensitivity Experiments of Display-MTF using ILMDs with Fixed Focus Macroscopic Lenses
Eurodisplay (2022)
This contribution uses the recently proposed Slanted Line approach to evaluate the MTF of a display as a measure of display resolution. It investigates the sensitivity for macroscopic imaging conditions and compares the reproducibility between four different macroscopic lenses using three different ILMDs. The samples consist of two displays combined with different structured top layers, which negatively affect the perceived resolution of the displays.
Pixel Crosstalk: A New Metric to Characterize DOI Loss Due to AG Treatments of Display Glasses
SID International Symposium 2016
A method is proposed that characterizes the loss of image clarity caused by anti-glare coatings. The method uses high resolution imaging, giving a distribution of scattered light that can be related easily to the clarity impression of the human eye. Results of different AG treated cover glasses are shown and a new parameter is proposed to characterize the loss of image clarity. This can be applied to the specification and characterization of the cover glasses as well as the characterisation of the final product for quality assurance.
Image Blurring Induced by Scattering Anti-Glare Layers
SID International Symposium 2016
We introduce the scattering-induced spreading of a narrow linear light source in transmission as an alternative method for characterization of image blurring induced by anti-glare layers. This novel method is compared to the recently presented concept of pixel crosstalk and to the transmissive scatter distribution function of anti-glare layers measured in two different ways. The reduction of transmittance modulation is presented as an additional method for characterization of image blur. The ranking of the results is compared to a generalized haze level of the AG samples as obtained from the transmittance distribution functions measured with two different methods.
- Type:
- Add-On
- Applications:
- Automotive Display
- Measurands:
- Light measurement
- Tasks:
- Development & Industry