Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1997-02-18
1998-07-14
Mengistu, Amare
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 94, G09G 330
Patent
active
057811687
ABSTRACT:
Method of driving a matrix-addressed electroluminescent device without deteriorating it. A display data driving voltage is applied to the column electrodes. A line scanning driving voltage is applied to the row electrodes successively. Before the display data driving voltage ceases, the line scanning driving voltage applied to the row electrode acting as a common electrode for all electroluminescent cells in one column is turned off. Thus, these cells are deactivated almost simultaneously. Electric charges remaining on the electro-luminescent cells in this row do not induce spike voltages on other electroluminescent cells. Therefore, deterioration of the electroluminescent cells is prevented. Electric charges produced when the row electrode-driving voltage is turned off flow directly into a power supply for the row electrodes. This power supply is designed to absorb the flowing charges. The potential is prevented from exceeding the power voltage. This protects the row electrode-driving power supply against destruction.
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Matsumoto Muneaki
Osada Masahiko
Yokota Minoru
Mengistu Amare
Nippondenso Co. Ltd.
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