Display device
AssigneeInnolux Corporation
InventorsKazuyuki Hashimoto, Hidetoshi Watanabe
Life of this patent
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Abstract
A display device includes at least one pixel circuit. A pixel circuit of the at least one pixel circuit includes a light emitting diode, a thin film transistor, a capacitor, and an adaptive voltage source. The light emitting diode has a first electrode, and a second electrode. The thin film transistor is coupled to the light emitting diode. The thin film transistor has a first terminal, a second terminal, and a control terminal for receiving a data voltage. The capacitor is coupled between the first terminal and the control terminal of the thin film transistor. The adaptive voltage source is coupled to the thin film transistor and fixes a voltage between the first terminal and the second terminal of the thin film transistor.
Claims13
A display device comprising:
- at least one pixel circuit, and a pixel circuit of the at least one pixel circuit comprising:
- a light emitting diode (LED) having a first electrode and a second electrode;
- a first thin film transistor (TFT) coupled to the LED, the first TFT having a first terminal configured to receive a first system voltage or a second adaptive voltage, a second terminal coupled to the first electrode of the LED, and a control terminal configured to receive a data voltage;
- a capacitor coupled between the first terminal and the control terminal of the first TFT;
- and
- a first adaptive voltage source coupled to the first TFT and configured to keep a voltage between the first terminal and the second terminal of the first TFT, the first adaptive voltage source having a first node coupled to the second electrode of the LED for providing a first adaptive voltage, and a second node coupled to the second terminal of the first TFT;
- wherein:
- the first TFT is a P-type TFT;
- and
- the first system voltage and the second adaptive voltage are higher than the first adaptive voltage.
A display device comprising:
- at least one pixel circuit, and a pixel circuit of the at least one pixel circuit comprising:
- a light emitting diode (LED) having a first electrode and a second electrode;
- a first thin film transistor (TFT) coupled to the LED, the first TFT having a first terminal, a second terminal, and a control terminal configured to receive a data voltage;
- a capacitor coupled between the first terminal and the control terminal of the first TFT;
- and
- a first adaptive voltage source coupled to the first TFT and configured to keep a voltage between the first terminal and the second terminal of the first TFT;
- wherein:
- the first TFT is an N-type TFT;
- a first node of the first adaptive voltage source is coupled to the first electrode of the LED for providing a first adaptive voltage, and a second node of first adaptive voltage source is coupled to the second terminal of the first TFT;
- the first terminal of the first TFT is configured to receive a second system voltage or a second adaptive voltage, and the second terminal of the first TFT is coupled to the second electrode of the LED;
- and
- the first adaptive voltage is higher than the second system voltage and the second adaptive voltage.
A display device comprising:
- at least one pixel circuit, a pixel circuit of the at least one pixel circuit comprising:
- a light emitting diode (LED);
- a plurality of first thin film transistors (TFTs) coupled to the LED, each being controlled by a corresponding control signal;
- and
- at least one capacitor, each coupled between a first terminal and a control terminal of a corresponding first TFT of the plurality of first TFTs;
- wherein a channel width-to-length ratio of an nth first TFT of the plurality of first TFTs is substantially equal to one or two times a channel width-to-length ratio of an (n−1)th first TFT of the plurality of first TFTs, n is an integer and greater than 1.
Dependencies are inferred from the claim text.