Current drive circuit and display device using the same, pixel circuit, and drive method
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United States of America Patent
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Feb 22, 2005
Grant Date -
N/A
app pub date -
Aug 13, 2001
filing date -
Jul 14, 1999
priority date (Note) -
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Abstract
A display including a current drive circuit capable of supplying a desired current to a light-emitting element in each pixel stably and accurately irrespective of the characteristic variations of active elements in the pixel, thereby providing a high-definition image. Each pixel is composed of a receiving transistor (TFT3) for receiving a signal current (1w) from a data ine (data) when a scanning line (scanA) is selected, a converting transistor (TFT1) for converting the current level of the received signal current (1w) to a voltage level and holding the voltage level, and a driving transistor (TFT3) for allowing a drive current having a current level corresponding to the held voltage level to flow through light-emitting element (OLED). The converting thin film transistor (TFT1) generates the converted voltage level at its gate by allowing the signal current (Iw) through its channel, and a capacitor (C) holds the voltage level at the gate of the transistor (TFT1). The transistor (TFT2) allows the drive current having a current level corresponding to the voltage level held by the capacitor (C) to flow through the light-emitting element (OLED).
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