Displays with silicon and semiconducting oxide thin-film transistors
An electronic device may include a display having an array of display pixels on a substrate. The display pixels may be organic light-emitting diode display pixels or display pixels in a liquid crystal display. In an organic light-emitting diode display, hybrid thin-film transistor structures may be formed that include semiconducting oxide thin-film transistors, silicon thin-film transistors, and capacitor structures. The capacitor structures may overlap the semiconducting oxide thin-film transistors. Organic light-emitting diode display pixels may have combinations of oxide and silicon transistors. In a liquid crystal display, display driver circuitry may include silicon thin-film transistor circuitry and display pixels may be based on oxide thin-film transistors. A single layer or two different layers of gate metal may be used in forming silicon transistor gates and oxide transistor gates. A silicon transistor may have a gate that overlaps a floating gate structure.
1. A display pixel comprising:
a first power supply terminal;
a second power supply terminal;
a light-emitting diode coupled between the first and second power supply terminals;
a drive transistor coupled between the first power supply terminal and the light-emitting diode, wherein the drive transistor has a source terminal, a drain terminal, and a gate terminal;
an oxide switching transistor that is directly connected to a node, wherein the node is directly connected to the gate terminal of the drive transistor;
a capacitor having a first plate that is directly connected to the node that is directly connected to the gate terminal of the drive transistor; and
a silicon switching transistor that is directly connected to an anode of the light-emitting diode.
2. The display pixel defined in claim 1 , wherein the silicon switching transistor is directly connected between the anode and a signal line.
3. The display pixel defined in claim 1 , wherein the silicon switching transistor is directly connected between the anode and a signal line for a column of display pixels.
4. The display pixel defined in claim 1 , wherein the first power supply terminal comprises a positive power supply terminal and wherein the second power supply terminal comprises a ground power supply terminal.
5. The display pixel defined in claim 4 , wherein the light-emitting diode has a cathode that is coupled to the ground power supply terminal.
6. The display pixel defined in claim 1 , wherein the oxide switching transistor is directly connected between the node and a signal line.
7. The display pixel defined in claim 1 , wherein the oxide switching transistor is directly connected between the node and a signal line for a column of display pixels.
8. A display pixel comprising:
a positive power supply terminal;
a ground power supply terminal;
a light-emitting diode coupled between the positive power supply terminal and the ground power supply terminal, wherein the light-emitting diode has an anode and a cathode and wherein the cathode is coupled to the ground power supply terminal;
a drive transistor coupled between the positive power supply terminal and the anode of the light-emitting diode, wherein the drive transistor has a gate;
a capacitor having first and second plates, wherein the first plate is directly connected to a node and wherein the node is directly connected to the gate of the drive transistor;
an oxide switching transistor that is directly connected to the node that is directly connected to the gate of the drive transistor; and
a silicon switching transistor that is directly connected between the anode of the light-emitting diode and a signal line.
9. A display pixel comprising:
a positive power supply terminal;
a ground power supply terminal;
a light-emitting diode coupled between the positive power supply terminal and the ground power supply terminal, wherein the light-emitting diode has an anode and a cathode and wherein the cathode is coupled to the ground power supply terminal;
a drive transistor having a gate, a first terminal, and a second terminal, wherein the first terminal is coupled to the positive power supply terminal and the second terminal is coupled to the anode of the light-emitting diode;
a capacitor having first and second plates, wherein the first plate is directly connected to a first node and wherein the first node is directly connected to the gate of the drive transistor;
a first oxide switching transistor that is directly connected to the first node; and
a second oxide switching transistor that is directly connected to a second node, wherein the second node is directly connected to the second terminal of the drive transistor.
10. The display pixel defined in claim 9 , wherein the second plate is directly connected to the second node.