Active matrix electroluminescent display and method of operation
First Claim
1. An electroluminescent display comprising an array of pixels, each pixel includinga first transistor having its gate connected to a select line, its source connected to a data line and its drain connected to the gate of a second transistor;
- the second transistor having it source connected to the data line and its drain connected to a first electrode of an electroluminescent cell; and
said electroluminescent cell having a second electrode which is connected to means for providing an alternating voltage power source with the voltage power source means being connected between the second electrode and a source of reference potential.
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Abstract
An active matrix electroluminescent display (AMELD) having an improved light emitting efficiency and methods of operating the AMELD to produce gray scale operation comprises a plurality of pixels, each pixel including a first transistor having its gate connected to a select line, its source connected to a data line and its drain connected to the gate of a second transistor, the second transistor having its source connected to the data line and its drain connected to a first electrode of an electroluminescent (EL) cell. The EL cell'"'"'s second electrode is connected to alternating high voltage means. A method for producing gray scale performance including the step of varying the length of time the second transistor is on while the alternating voltage is applied to the EL cell is also disclosed.
210 Citations
7 Claims
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1. An electroluminescent display comprising an array of pixels, each pixel including
a first transistor having its gate connected to a select line, its source connected to a data line and its drain connected to the gate of a second transistor; -
the second transistor having it source connected to the data line and its drain connected to a first electrode of an electroluminescent cell; and said electroluminescent cell having a second electrode which is connected to means for providing an alternating voltage power source with the voltage power source means being connected between the second electrode and a source of reference potential. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating an active matrix electroluminescent display, said display comprising a plurality of pixels, each pixel including a first transistor having its gate connected to a select line, its source connected to a data line and its drain connected to the gate of a second transistor;
- the second transistor having its source connected to the date line and its drain connected to a first electrode of an electroluminescent cell, the electroluminescent cell having a second electrode, the method comprising the steps of
applying voltages to the select and data lines to enable the second transistor of a given pixel; applying a power source to the second electrode of the electroluminescent cell of the given pixel for a period of time; and disabling the second transistor of the given pixel prior to the completion of said period of time.
- the second transistor having its source connected to the date line and its drain connected to a first electrode of an electroluminescent cell, the electroluminescent cell having a second electrode, the method comprising the steps of
Specification