| 摘要 |
PURPOSE:To eliminate the personal difference of a person to set a driving voltage and to enhance the accuracy of setting of the driving voltage by converting the flicker of a display device to a constant quantity by using an evaluation parameter and setting the driving voltage so as to minimize the evaluation parameter. CONSTITUTION:The light past an LCD 4 in a thermostatic chamber 1 is detected by a photocell 5 and the average luminance is read by a voltmeter 7 and is subjected to a frequency division by an analyzer 8. The result thereof is sent via a computer 11 to a printer 13 and a plotter 14. The average luminance of the light F(t) which is sinusoidally oscillated by the single frequency fHz is designated as L, the angular velocity as omega, the max. value as F(t)max, and the min. value as F(t)min. The luminance modulation degree m indicating the degree of the flicker is used as the parameter defined by the equation and the light response waveform when the prescribed voltage is impressed to the display device is subjected to Fourier transform to know the amplitude of the specific frequency fHz component. The luminance modulation degree mf of the fHz component is determined by the equation and the offset voltage between the voltages to be applied to confronted upper and lower electrodes at the time of driving is so set as to minimize the modulation degree mf of the specific frequency f.
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