US 9,177,505 B2Granted

Pixel of a display panel capable of compensating differences of electrical characteristics and driving method thereof

AssigneeAu Optronics Corporation

InventorsChun-Chieh Lin, Ya-Ling Chen

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Abstract

A pixel of a display panel includes a first transistor with a first end coupled to a data line, a control end coupled to a scan line; a second transistor with a first end coupled to a first voltage source, a control end coupled to a second end of the first transistor; a third transistor with a first end coupled to a second end of the second transistor, a control end for receiving a control signal; a light emitting unit with a first end coupled to the second end of the second transistor, a second end coupled to a second voltage source; a first capacitor with a first end coupled to the second end of the first transistor, a second end coupled to a second end of the third transistor; and a second capacitor coupled between the second end of the first capacitor and the second voltage source.

Claims8

Dependent claims

A pixel of a display panel, comprising:

a first transistor with a first end directly coupled to a data line, and a control end coupled to a scan line for receiving a scan signal, wherein the first transistor is turned on in a scanning period and turned off after the scanning period, the first end of the first transistor receives a first voltage signal in a first sub-period of the scanning period, receives a second voltage signal different from the first voltage signal in a second sub-period of the scanning period, and receives a display voltage signal in a third sub-period of the scanning period;
a second transistor with a first end coupled to a first voltage source, and a control end coupled to a second end of the first transistor;
a third transistor with a first end coupled to a second end of the second transistor, and a control end for receiving a control signal, wherein the third transistor is turned on by the control signal in the first sub-period, in the second sub-period, and after the scanning period, and the third transistor is turned off by the control signal in the third sub-period;
a light emitting unit with a first end coupled to the second end of the second transistor, and a second end coupled to a second voltage source;
a first capacitor with a first end directly coupled to the second end of the first transistor, and a second end directly coupled to a second end of the third transistor;
and
a second capacitor with a first end coupled to the second end of the first capacitor, and a second end coupled to the second voltage source.

4 more elements

A driving method of a pixel of a display panel, comprising:

providing a display panel comprising a plurality of scan lines, a plurality of data lines, and a plurality of pixels, wherein each pixel comprises a first transistor, a second transistor, a third transistor, a light emitting unit, a first capacitor, and a second capacitor, a first end of the first transistor is directly coupled to a data line of the plurality of data lines, a control end of the first transistor is coupled to a scan line of the plurality of scan lines for receiving a scan signal, a first end of the second transistor is coupled to a first voltage source, a control end of the second transistor is coupled to a second end of the first transistor, a first end of the third transistor is coupled to a second end of the second transistor, a control end of the third transistor is for receiving a control signal, a first end of the light emitting unit is coupled to the second end of the second transistor, a second end of the light emitting unit is coupled to a second voltage source, a first end of the first capacitor is directly coupled to the second end of the first transistor, a second end of the first capacitor is directly coupled to a second end of the third transistor, a first end of the second capacitor is coupled to the second end of the first capacitor, and a second end of the second capacitor is coupled to the second voltage source;
turning on the first transistor in a scanning period;
in a first sub-period of the scanning period, the first end of the first transistor receiving a first voltage signal for resetting voltage levels of the first capacitor and the second capacitor, and turning on the third transistor;
in a second sub-period of the scanning period, the first end of the first transistor receiving a second voltage signal different from the first voltage signal for writing compensation voltage into the second end of the first capacitor, and turning on the third transistor;
in a third sub-period of the scanning period, the first end of the first transistor receiving a display voltage signal for compensating the display voltage signal according to the compensation voltage, and turning off the third transistor;
and
turning off the first transistor and turning on the third transistor after the scanning period.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/928,394Filed 27 Jun 2013
Priority: TW 102109309 A15 Mar 2013
Published: US 2014/0267468 A118 Sep 2014
Granted: 3 Nov 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G09G 3/3233
Using an active matrix: with pixel circuitry controlling the current through the light-emitting element
G09G 2300/0819
Several active elements per pixel in active matrix panels: used for counteracting undesired variations, e.g. feedback or autozeroing
G09G 2300/0852
Forming a memory circuit, e.g. a dynamic memory with one capacitor: being a dynamic memory with more than one capacitor
G09G 2320/0233
Improving the quality of display appearance: improving the luminance or brightness uniformity across the screen