Related Experiment Video
Updated: May 11, 2026
10:33
An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
Liquid crystal display screens as stimulators for visually evoked potentials: flash effect due to delay in luminance
Celso Soiti Matsumoto1, Kei Shinoda, Harue Matsumoto
1Department of Ophthalmology, Teikyo University School of Medicine, Kaga 2-11-1, Itabashi-ku, Tokyo, 173-8605, Japan.
Documenta Ophthalmologica. Advances in Ophthalmology
|May 22, 2013
Summary
Liquid crystal display (LCD) screens can elicit pattern-reversal visually evoked potentials (p-VEPs), but show delayed luminance changes compared to cathode-ray tube (CRT) screens. Reducing contrast minimizes flash effects, making LCDs a viable alternative for p-VEP testing.
Area of Science:
- Ophthalmology
- Neuroscience
- Medical Imaging
Background:
- Liquid crystal display (LCD) screens are increasingly replacing cathode-ray tube (CRT) screens in visual stimulators.
- Pattern-reversal visually evoked potentials (p-VEPs) are a key diagnostic tool in ophthalmology and neuroscience.
- Evaluating new display technologies for established electrophysiological tests is crucial.
Purpose of the Study:
- To assess the suitability of LCD screens for eliciting p-VEPs.
- To compare p-VEPs generated by LCDs versus traditional CRTs.
- To identify potential challenges and modifications for using LCDs in p-VEP testing.
Main Methods:
- Compared p-VEP waveforms from LCD and CRT screens.
- Measured screen luminance changes using photodiodes and luminance meters.
- Recorded VEPs and electroretinograms (ERGs) with and without a diffuser.
Main Results:
- LCD-elicited p-VEPs showed good reproducibility with N75 and P100 components.
- Significant latency delays (N75: 9.8 ms, P100: 10.2 ms) were observed with LCDs.
- LCDs produced larger N75-P100 amplitudes and transient luminance changes, inducing flash VEPs/ERGs.
- Reducing check contrast minimized luminance transients, improving waveform similarity to CRTs.
Conclusions:
- LCD screens are a viable alternative for p-VEP testing.
- Latency delays and flash effects from LCD luminance changes must be considered.
- Adjusting contrast can optimize LCD performance for p-VEP elicitation.
