FIELD SEQUENTIAL GRAY IN ACTIVE MATRIX LED DISPLAY USING COMPLEMENTARY TRANSISTOR PIXEL CIRCUITS
First Claim
1. An active matrix light-emitting diode (LED) display comprising:
- a pixel circuit that stores a signal voltage by selectively addressing a row and a column line in the display and means for transferring the signal voltage from the column line to a capacitance by means of a transfer device, thereby regulating current through a CMOS inverter and a LED, to control the amount of light emitted from the LED.
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Accused Products
Abstract
Disclosed is a pixel circuit consisting of complementary N- and P-channel MOS field-effect transistors (or of thin-film transistors), a capacitor, and an organic light-emitting diode. This circuit stores a voltage signal that is used to control the amount of light emitted from the pixel by means of a CMOS inverter. This pixel circuit is used in a two-dimensional array to form an active-matrix OLED display. The amount of light emitted at each pixel during a frame time is controlled by dividing the frame time into many sub-frames (or fields) and changing the stored voltage at the beginning of each sub-frame in such a way that the integrated time a voltage is stored during a frame time determines the total amount of light emitted.
239 Citations
23 Claims
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1. An active matrix light-emitting diode (LED) display comprising:
- a pixel circuit that stores a signal voltage by selectively addressing a row and a column line in the display and means for transferring the signal voltage from the column line to a capacitance by means of a transfer device, thereby regulating current through a CMOS inverter and a LED, to control the amount of light emitted from the LED.
- View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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4. An active matrix light-emitting diode display according to claim I in which the transfer device and CMOS inverter are amorphous silicon TFTs fabricated on a glass substrate;
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22. A structure comprising a circuit comprising a light emitting diode having a first terminal and a second terminal an access transistor having a first terminal, a second terminal and a gate electrode;
- an inverter comprising a first inverter transistor and a second inverter transistor each of which has a first terminal, a second terminal and a gate electrode;
said first and second inverter transistors being of opposite conductivity types;
a capacitor having a first terminal and a second terminal;
said gate electrode of said first inverter transistor being electrically connected to said gate electrode of said second inverter transistor, to said first terminal of said access transistor and to said first terminal of said capacitor;
said first terminal of said light-emitting diode being electrically connected to said first terminal of said first inverter transistor and to said second terminal of said second inverter transistor. - View Dependent Claims (23)
- an inverter comprising a first inverter transistor and a second inverter transistor each of which has a first terminal, a second terminal and a gate electrode;
Specification