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US 12,217,719 B2Granted
Pixel driving circuit and display device
AssigneeTcl China Star Optoelectronics Technology Co., Ltd.
InventorYan Li
Life of this patent
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Abstract
The present application provides a pixel driving circuit and a display device. The pixel driving circuit includes a scanning signal line and a data signal line. A pixel driving circuit unit includes at least two cascaded units, wherein the pixel driving circuit unit is configured to change a connection number of cascaded units that are connected to the data signal line and a light emitting diode, to adjust a brightness of the light emitting diode so as to effectively improve gray level of displayed picture and display quality.
Claims15
A pixel driving circuit, comprising:
- a scanning signal line;
- at least two data signal lines arranged with the scanning signal line in an interleaved manner;
- a light emitting diode, having a first end electrically coupled to a voltage source;
- and
- a pixel driving circuit unit, comprising at least two cascaded units, each cascaded unit having a first electrode electrically coupled to a corresponding data signal line, and a second electrode electrically coupled to a second end of the light emitting diode;
- wherein the pixel driving circuit unit is configured to change a connection number of the cascaded units being connected to the data signal lines and the light emitting diode, such that a brightness of the light emitting diode is adjusted accordingly;
- wherein:
- each cascaded unit comprises a switching thin film transistor and a driving thin film transistor;
- a source of the switching thin film transistor is electrically coupled to the corresponding data signal line;
- a gate of the switching thin film transistor is electrically coupled to the corresponding scanning signal line;
- a drain of the switching thin film transistor is electrically coupled to a gate of the corresponding driving thin film transistor;
- and
- the switching thin film transistor and the driving thin film transistor comprise at least one of N-type thin film transistors or P-type thin film transistors;
- wherein the at least two cascaded units share the scanning signal line, and
- the scanning signal line is connected to the gate of the switching thin film transistor in each cascaded unit;
- and
- the at least two cascaded units share a capacitor having one end grounded and another end connected to the drain of the switching thin film transistor and the gate of the driving thin film transistor in each cascaded unit.
14 more elements
A pixel driving circuit, comprising:
- a scanning signal line;
- at least two data signal lines arranged with the scanning signal line in an interleaved manner;
- a light emitting diode, having a first end electrically coupled to a voltage source;
- and
- a pixel driving circuit unit, comprising at least two cascaded units, each cascaded unit having a first electrode electrically coupled to a corresponding data signal line, and a second electrode electrically coupled to a second end of the light emitting diode;
- wherein the pixel driving circuit unit is configured to change a connection number of the cascaded units being connected to the data signal lines and the light emitting diode, such that a brightness of the light emitting diode is adjusted accordingly,
- wherein the light emitting diode comprises a first light emitting diode, a second light emitting diode, a third light emitting diode, and a fourth light emitting diode each respectively coupled to a second electrode of different cascaded units.
4 more elements
A display device comprising a display panel and a backlight source, wherein:
- the backlight source is connected to the display panel, configured to provide backlight for the display panel;
- the display panel comprises a pixel driving circuit comprising:
- a scanning signal line;
- at least two data signal lines arranged with the scanning signal line in an interleaved manner;
- a light emitting diode, having a first end electrically coupled to a voltage source;
- and
- a pixel driving circuit unit, comprising at least two cascaded units, each cascaded unit having one end electrically coupled to a corresponding data signal line, and another end electrically coupled to a second end of the light emitting diode;
- and
- wherein the pixel driving circuit unit is configured to change a connection number of the cascaded units being connected to the data signal lines and the light emitting diode, such that a brightness of the light emitting diode is adjusted accordingly;
- wherein each cascaded unit comprises a switching thin film transistor and a driving thin film transistor, and a capacitor having one end grounded and another end;
- a source of the switching thin film transistor is electrically coupled to the corresponding data signal line;
- a gate of the switching thin film transistor is electrically coupled to the corresponding scanning signal line;
- a drain of the switching thin film transistor is electrically coupled to a gate of the corresponding driving thin film transistor and the another end of the capacitor;
- a drain of the driving thin film transistor is electrically coupled to the second end of the light emitting diode;
- and
- a source of the driving thin film transistor is grounded;
- wherein the at least two cascaded units share the scanning signal line, and the scanning signal line is connected to the gate of the switching thin film transistor in each cascaded unit;
- and
- the at least two cascaded units share the capacitor having one end grounded and another end electrically coupled to the drain of the switching thin film transistor and the gate of the driving thin film transistor in each cascaded unit.
16 more elements
Dependencies are inferred from the claim text.