US 9,311,854 B2 · Pixel unit driving circuit, pixel unit and display device

Abstract

A pixel unit driving circuit, a pixel unit and a display device, wherein said pixel unit driving circuit of the pixel unit comprises a switching unit (201) having a first terminal connected to a high-voltage signal terminal (Vdd), a second terminal connected to a light-emitting device (OLED), a third terminal connected to a first control line (CN1), and a fourth terminal connected to a second control line (CN2); a driving transistor (T1) having a drain connected to the switching unit (201), and a source connected to a low-voltage signal terminal (Vss); and a capacitance storage unit (202) having a first terminal connected to the gate of the driving transistor (T1), a second terminal connected to the source of the driving transistor (T1), and a third terminal connected to the second control line (CN2). Amount and on-off of the driving current Ioled and data current Idata can be controlled via the switching unit (201) to make the current scaling ratio Idata/Ioled change inversely as Ioled changes, thus guaranteeing the data current Idata can quickly charge the first capacitor regardless of amount of the driving current Ioled.

Claims8

Dependent claims

A pixel unit driving circuit comprises:

a switching unit having a first terminal connected to a high-voltage signal terminal, a second terminal connected to a light-emitting device, a third terminal connected to a first control line, and a fourth terminal connected to a second control line;
a driving transistor having a drain connected to the switching unit, and a source connected to a low-voltage signal terminal;
and
a capacitance storage unit having a first terminal connected to the gate of the driving transistor, a second terminal connected to the source of the driving transistor, and a third terminal connected to the second control line,
wherein said capacitance storage unit includes:
a first capacitor, a second capacitor, and a fifth transistor, wherein
said first capacitor having one terminal connected to the gate of said driving transistor, and another terminal connected to the source of the driving transistor;
said second capacitor having one terminal connected to the gate of said driving transistor, and another terminal connected to the drain of said fifth transistor;
said fifth transistor having a gate connected to said second control line, and a source connected to the source of said driving transistor.

6 more elements

A pixel unit driving circuit comprises:

a switching unit having a first terminal connected to a high-voltage signal terminal, a second terminal connected to a light-emitting device, a third terminal connected to a first control line, and a fourth terminal connected to a second control line;
a driving transistor having a drain connected to the switching unit, and a source connected to a low-voltage signal terminal;
and
a capacitance storage unit having a first terminal connected to the gate of the driving transistor, a second terminal connected to the source of the driving transistor, and a third terminal connected to the second control line,
wherein said capacitance storage unit includes:
a first capacitor, a second capacitor, and a fifth transistor, wherein
said first capacitor having one terminal connected to the gate of the driving transistor, and another terminal connected to one terminal of said second capacitor;
said second capacitor having another terminal connected to the source of the driving transistor;
said fifth transistor having a drain connected between said first capacitor and the second capacitor, a gate connected to the second control line, and a source connected to the source of said driving transistor.

6 more elements

Dependencies are inferred from the claim text.

Pixel unit driving circuit, pixel unit and display device

Life of this patent

Pixel unit driving circuit, pixel unit and display device

Life of this patent

Abstract

Claims8