Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-12-27
2011-12-27
Osorio, Ricardo L (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C315S169300
Reexamination Certificate
active
08085225
ABSTRACT:
In organic EL display apparatuses, when the reset operating time required for compensating variations in the OLED drive TFT voltage threshold is too short then fluctuations in the threshold voltage Vth cannot be corrected and an accurate gray scale is impossible. A precharge voltage is supplied from the precharge TFT switch prior to the reset TFT switch and the light TFT switch resetting the Vth of the OLED driver TFT, in order to apply a specified voltage value to the gate voltage of the OLED driver TFT prior to reset. The voltage potential on the gate of the OLED driver TFT prior to reset is therefore no longer an undetermined voltage potential so variations in the gate voltage after reset are suppressed and variations in the gray scale are suppressed.
REFERENCES:
patent: 2003-005709 (2001-06-01), None
patent: 2003-122301 (2001-10-01), None
R.M.A. Dawson et al., “Design of an Improved Pixel for a Polysilicon Active-Matrix Organic LED Display”, SID 98 Digest, pp. 11-14.
Akimoto Hajime
Kohno Tohru
Miyamoto Mitsuhide
A. Marquez, Esq. Juan Carlos
Hitachi Displays Ltd.
Osorio Ricardo L
Stites & Harbison PLLC
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