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US 7,071,905 B1Granted
Active matrix display with light emitting diodes
OwnerNong-qiang Faninventor
Life of this patent
Estimating the term…
Abstract
A pixel element in the matrix of pixel elements includes a light emitting diode, a resistor electrically connecting to the light emitting diode, a data input, and a sensing output. The data input receives a data signal that changes a current flowing through the light emitting diode when the data input is enabled. The sensing output generates a sensing signal when the sensing output is enabled. The sensing output generates substantially no sensing signal when the sensing output is disabled. A change in a current flowing through both the light emitting diode and the resistor induces a change in the sensing signal.
Claims105
An active matrix display comprising:
- an array of selection driving lines;
- an array of data driving lines crossing the array of selection driving lines;
- an array of sensing output lines crossing the array of selection driving lines;
- and
- a matrix of pixel elements, wherein a pixel element electrically connects to at least one selection driving line and electrically connects to at least one data driving line, the pixel element comprises,
- a biasing transistor having a gate, a source, and a drain, and a semiconductor channel between the source thereof and the drain thereof,
- a light emitting diode electrically connecting to the semiconductor channel of the biasing transistor,
- a resistor electrically connecting to the light emitting diode,
- a monitoring point on a current path that passes through at least the light emitting diode and the resistor, and
- a sensing output electrically connecting to a sensing output line, the sensing output receiving a sensing signal from the monitoring point when the sensing output is enabled.
7 more elements
An active matrix display comprising:
- an array of selection driving lines;
- an array of data driving lines crossing the array of selection driving lines;
- an array of sensing output lines crossing the array of selection driving lines;
- and
- a matrix of pixel elements, wherein a pixel element electrically connects to at least one selection driving line, the pixel element comprises,
- a light emitting diode,
- a resistor electrically connecting to the light emitting diode,
- a data input electrically connecting to a data driving line, the data input receiving a data signal that changes a current flowing through the light emitting diode when the data input is enabled, and
- a sensing output electrically connecting to a sensing output line, the sensing output generating a sensing signal when the sensing output is enabled, the sensing output generating substantially no sensing signal when the sensing output is disabled, and wherein a change in a current flowing through both the light emitting diode and the resistor induces a change in the sensing signal.
6 more elements
An active matrix display comprising:
- an array of selection driving lines;
- an array of data driving lines crossing the array of selection driving lines;
- an array of sensing output lines crossing the array of selection driving lines;
- and
- a matrix of pixel elements, wherein a pixel element electrically connects to at least one selection driving line, the pixel element comprises,
- a light emitting diode,
- a resistor electrically connecting to the light emitting diode,
- a data input electrically connecting to a data driving line, the data input receiving a data signal that changes a current flowing through the light emitting diode when the data input is enabled,
- a sensing output connecting to a sensing output line, and
- means for generating a sensing signal on the sensing output when the sensing output is enabled, and wherein a change in a current flowing through both the light emitting diode and the resistor induces a change in the sensing signal.
7 more elements
An active matrix display comprising:
- an array of selection driving lines;
- an array of data driving lines crossing the array of selection driving lines;
- an array of sensing output lines crossing the array of selection driving lines;
- and
- a matrix of pixel elements wherein a pixel element comprises,
- a first switching transistor having a gate, a source, and a drain, and a semiconductor channel between the source thereof and the drain thereof, wherein the gate of the first switching transistor electrically connects to a selection driving line,
- a second switching transistor having a gate, a source, and a drain, and a semiconductor channel between the source thereof and the drain thereof, wherein the gate of the second switching transistor electrically connects to a selection driving line,
- a biasing transistor having a gate, a source, and a drain, and a semiconductor channel between the source thereof and the drain thereof, wherein the gate of the biasing transistor electrically connects to a data driving line through the semiconductor channel of the first switching transistor,
- a storage capacitor electrically connecting to the gate of the biasing transistor,
- a light emitting diode electrically connecting to the semiconductor channel of the biasing transistor,
- a resistor having a first terminal and a second terminal, the first terminal of the resistor electrically connecting to the light emitting diode, the second terminal of the resistor electrically connecting to a common voltage, and
- wherein the first terminal of the resistor electrically connects to a sensing output line through the semiconductor channel of the second switching transistor.
9 more elements
An active matrix display comprising:
- an array of selection driving lines;
- an array of data driving lines crossing the array of selection driving lines;
- an array of sensing output lines crossing the array of selection driving lines;
- and
- a matrix of pixel elements wherein a pixel element comprises,
- a first switching transistor having a gate, a source, and a drain, and a semiconductor channel between the source thereof and the drain thereof, wherein the gate of the first switching transistor electrically connects to a selection driving line,
- a second switching transistor having a gate, a source, and a drain, and a semiconductor channel between the source thereof and the drain thereof, wherein the gate of the second switching transistor electrically connects to a selection driving line,
- a biasing transistor having a gate, a source, and a drain, and a semiconductor channel between the source thereof and the drain thereof, wherein the gate of the biasing transistor electrically connects to a data driving line through the semiconductor channel of the first switching transistor,
- a storage capacitor electrically connecting to the gate of the biasing transistor,
- a light emitting diode electrically connecting to the semiconductor channel of the biasing transistor,
- a resistor serially connecting to the light emitting diode and forms a compound component having a first terminal and a second terminal, and
- wherein the second terminal of the compound component electrically connects to a common voltage, and the first terminal of the compound component electrically connects to a sensing output line through the semiconductor channel of the second switching transistor.
9 more elements
A method applied on an active matrix display,
- the active matrix display comprising an array of selection driving lines, an array of data driving lines crossing the array of selection driving lines, an array of sensing output lines being crossing the array of selection driving lines, and a matrix of pixel elements including at least one pixel element that comprises (a) a light emitting diode, (b) a resistor electrically connecting to the light emitting diode, (c) a monitoring point on a current path that passes through at least the light emitting diode and the resistor, (d) a sensing output operable to receive a sensing signal from the monitoring point when the sensing output is enabled, the sensing output electrically connecting to a sensing output line, (e) a data input operable to change a current flowing through the light emitting diode when the data input is enabled, the data input electrically connecting to a data driving line, and (f) at least one selection input electrically connecting to a selection driving line,
- the method comprising:
- selecting a row of pixel elements in the matrix of pixel elements;
- and
- driving a given pixel element in the selected row with a feedback data driver in a negative feedback loop, wherein the driving comprises,
- receiving with the feedback data driver a sensing signal from a sensing output line electrically connecting to the sensing output of the given pixel element, wherein the sensing signal is related to a current flowing through both the light emitting diode and the resistor in the given pixel element,
- generating with the feedback data driver a data signal that depends on the sensing signal received from the given pixel element, and
- transmitting with the feedback data driver a data signal to a data driving line electrically connecting to the data input of the given pixel element to complete the negative feedback loop.
5 more elements
The method of 87, wherein the comparing comprises:
- comparing a reference signal with a corresponding signal that is proportional to the sensing signal received from the given pixel element.
The method of 87, wherein generating an error signal comprises:
- generating an error signal that is proportional to a difference between the reference signal and the corresponding signal.
The method of 87, wherein generating a data signal that depends on the error signal comprises:
- generating a data signal that is proportional to the error signal.
Dependencies are inferred from the claim text.