Display with light-emitting diodes
A display may have an array of pixels each of which has a light-emitting diode such as an organic light-emitting diode. A drive transistor and an emission transistor may be coupled in series with the light-emitting diode of each pixel between a positive power supply and a ground power supply. The pixels may include first and second switching transistors. A data storage capacitor may be coupled between a gate and source of the drive transistor in each pixel. Signal lines may be provided in columns of pixels to route signals such as data signals, sensed drive currents from the drive transistors, and predetermined voltages between display driver circuitry and the pixels. The switching transistors, emission transistors, and drive transistors may include semiconducting-oxide transistors and silicon transistors and may be n-channel transistors or p-channel transistors.
1. A display comprising a plurality of pixels, wherein each pixel in the plurality of pixels comprises:
a first transistor;
a second transistor;
a third transistor;
a light-emitting diode, wherein the first transistor, the second transistor, the third transistor, and the light-emitting diode are connected in series between a first power supply terminal and a second power supply terminal;
a fourth transistor that is coupled between a source of the second transistor and a data line; and
a fifth transistor that is coupled to an anode of the light-emitting diode, wherein a gate of the fifth transistor receives a control signal that is also provided to a gate of the fourth transistor in a previous row.
2. The display defined in claim 1 , wherein the first, second, third, fourth, and fifth transistors are silicon transistors.
3. The display defined in claim 2 , wherein each pixel in the plurality of pixels further comprises:
a sixth transistor that is coupled to a gate of the second transistor.
4. The display defined in claim 3 , wherein the sixth transistor is a semiconducting-oxide transistor.
5. The display defined in claim 1 , wherein each pixel in the plurality of pixels further comprises:
a capacitor that is coupled to a gate of the second transistor.
6. The display defined in claim 1 , further comprising:
a global signal path that distributes a shared voltage to all of the plurality of pixels, wherein the fifth transistor in each pixel in the plurality of pixels is coupled to the global signal path.
7. A display comprising a plurality of pixels, wherein a first pixel in the plurality of pixels comprises:
a first transistor;
a second transistor;
a third transistor;
a light-emitting diode, wherein the first transistor, the second transistor, the third transistor, and the light-emitting diode are connected in series between a first power supply terminal and a second power supply terminal;
a fourth transistor that is coupled between a first node and a data line, wherein the first node is interposed between the second transistor and the first transistor; and
a fifth transistor that is coupled to an anode of the light-emitting diode, wherein the fifth shares a control signal with a transistor in a second pixel of the plurality of pixels.
8. The display defined in claim 7 , wherein the first pixel is in a first row of pixels and wherein the second pixel is in a second row of pixels that is a previous row to the first row of pixels.
9. The display defined in claim 8 , wherein the second pixel of the plurality of pixels comprises:
an additional first transistor;
an additional second transistor;
an additional third transistor;
an additional light-emitting diode, wherein the additional first transistor, the additional second transistor, the additional third transistor, and the additional light-emitting diode are connected in series between an additional first power supply terminal and an additional second power supply terminal; and
an additional fourth transistor that is coupled between an additional first node and the data line, wherein the additional first node is interposed between the additional second transistor and the additional first transistor and wherein the additional fourth transistor is the transistor that shares the control signal with the fifth transistor in the first pixel.
10. The display defined in claim 7 , wherein the first, second, third, fourth, and fifth transistors are silicon transistors.
11. The display defined in claim 10 , wherein the first pixel further comprises:
a sixth transistor that is coupled to a gate of the second transistor.
12. The display defined in claim 11 , wherein the sixth transistor is a semiconducting-oxide transistor.
13. The display defined in claim 7 , wherein the first pixel further comprises:
a capacitor that is coupled to a gate of the second transistor.
14. The display defined in claim 7 , further comprising:
a global signal path that distributes a shared voltage to all of the plurality of pixels, wherein the fifth transistor is coupled to the global signal path.
15. A display comprising a plurality of pixels, wherein each pixel in the plurality of pixels comprises:
a first transistor;
a second transistor;
a third transistor;
a light-emitting diode, wherein the first transistor, the second transistor, the third transistor, and the light-emitting diode are connected in series between a first power supply terminal and a second power supply terminal;
a fourth transistor that is coupled between a source of the second transistor and a data line; and
a fifth transistor that is coupled to an anode of the light-emitting diode, wherein a gate of the fifth transistor is controlled using a scan line signal from a previous row.
16. The display defined in claim 15 , wherein, for each pixel in the plurality of pixels, the scan line signal from the previous row controls a gate of the fourth transistor in the previous row.
17. The display defined in claim 15 , wherein the first, second, third, fourth, and fifth transistors are silicon transistors.
18. The display defined in claim 17 , wherein each pixel in the plurality of pixels further comprises:
a sixth transistor that is coupled to a gate of the second transistor.
19. The display defined in claim 18 , wherein the sixth transistor is a semiconducting-oxide transistor.
20. The display defined in claim 15 , wherein each pixel in the plurality of pixels further comprises:
a capacitor that is coupled to a gate of the second transistor.