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. 2014:2014:606951.
doi: 10.1155/2014/606951. Epub 2014 Aug 14.

Pattern visual evoked potentials elicited by organic electroluminescence screen

Celso Soiti Matsumoto  1 , Kei Shinoda  2 , Harue Matsumoto  3 , Hideaki Funada  4 , Kakeru Sasaki  2 , Haruka Minoda  2 , Takeshi Iwata  5 , Atsushi Mizota  2
Affiliations

Pattern visual evoked potentials elicited by organic electroluminescence screen

Celso Soiti Matsumoto et al. Biomed Res Int. 2014.

Abstract

Purpose: To determine whether organic electroluminescence (OLED) screens can be used as visual stimulators to elicit pattern-reversal visual evoked potentials (p-VEPs).

Method: Checkerboard patterns were generated on a conventional cathode-ray tube (S710, Compaq Computer Co., USA) screen and on an OLED (17 inches, 320 × 230 mm, PVM-1741, Sony, Tokyo, Japan) screen. The time course of the luminance changes of each monitor was measured with a photodiode. The p-VEPs elicited by these two screens were recorded from 15 eyes of 9 healthy volunteers (22.0 ± 0.8 years).

Results: The OLED screen had a constant time delay from the onset of the trigger signal to the start of the luminescence change. The delay during the reversal phase from black to white for the pattern was 1.0 msec on the cathode-ray tube (CRT) screen and 0.5 msec on the OLED screen. No significant differences in the amplitudes of P100 and the implicit times of N75 and P100 were observed in the p-VEPs elicited by the CRT and the OLED screens.

Conclusion: The OLED screen can be used as a visual stimulator to elicit p-VEPs; however the time delay and the specific properties in the luminance change must be taken into account.

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Figures

Figure 1
Figure 1
Changes in the average luminance of a single check of the cathode-ray tube (CRT) screen and the organic electroluminescence (OLED) screen during pattern reversal. There is no luminance change in the overall luminance across the screen because half of the checks are changing in the opposite direction. ((a), (c), and (e)) cathode-ray tube (CRT) screen shows burst of pulses and ((b), (d), and (f)) organic electroluminescence (OLED) screen shows rectangular-shaped luminance change. (a) Luminance changes of a single check from white to black of CRT screen. (c) Luminance changes of a single check from black to white of CRT screen. (e) Averaged luminance changes of the CRT screen. There is no change in the total luminance (y-axis) during time (x-axis). (b) Luminance changes of a single check from white to black of OLED screen. (d) Luminance changes of a single check from black to white of OLED screen. (f) Averaged luminance changes of OLED screen. There is no change in the total luminance (y-axis) during time (x-axis).
Figure 2
Figure 2
Luminance change of a single check during reversal of black to white. Short and constant delay as a response time was detected during the check reversal of approximately 1.0 ms in the CRT screen and approximately 0.5 ms in the OLED screen.
Figure 3
Figure 3
Representative waveform of p-VEP. P-VEP waveforms elicited by CRT (a) and OLED (b) screens.
Figure 4
Figure 4
Comparisons of each parameter between the pattern VEPs (p-VEPs) elicited by CRT and by OLED screens. (a) No significant difference was found between the p-VEP P100 amplitude elicited by the OLED screen and that elicited by the CRT screen. (b) No significant difference was found in the implicit time of N75 elicited by the OLED screen to between the p-VEP elicited by the CRT and OLED screens as a stimulator. No significant difference was observed in the implicit times of N75 between the p-VEPs elicited by the CRT and the OLED screens as a stimulator. ns: not significant.
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