Pixel circuit and vehicle display device

Abstract

A pixel circuit includes a first transistor, a second transistor, a driving transistor, a light-emitting control transistor, and a light-emitting element. The control terminal of the first transistor receives a first scan signal, and its first terminal receives a preset voltage. The control terminal of the second transistor receives a second scan signal, and its first terminal is coupled to a first node. The first control terminal of the driving transistor is coupled to the first node, and its second control terminal is coupled to a second terminal of the first transistor. The first terminal of the driving transistor receives a system high voltage, and its second terminal is coupled to a second node. The control terminal of the light-emitting control transistor receives a light-emitting control signal. The first terminal of the light-emitting element is coupled to a third node, and its second terminal receives a system low voltage.

Claims

1. A pixel circuit, comprising: A first transistor, wherein a control terminal of the first transistor receives a first scan signal, and a first terminal of the first transistor receives a preset voltage; A second transistor, wherein a control terminal of the second transistor receives a second scan signal, and a first terminal of the second transistor is coupled to a first node; a driving transistor, wherein a first control terminal of the driving transistor is coupled to the first node, a second control terminal of the driving transistor is coupled to a second terminal of the first transistor, the first terminal of the driving transistor receives a system high voltage, and the second terminal of the driving transistor is coupled to a second node, wherein the first control terminal controls a first channel of the driving transistor, and the second control terminal controls a second channel of the driving transistor; a light-emitting control transistor, wherein a control terminal of the light-emitting control transistor receives a light-emitting control signal, the first terminal of the light-emitting control transistor is coupled to the second node, and the second terminal of the light-emitting control transistor is coupled to a third node; and a light-emitting element, wherein a first terminal of the light-emitting element is coupled to the third node, and a second terminal of the light-emitting element receives a system low voltage.

2. The pixel circuit as claimed in claim 1, wherein in a night mode, the first control terminal and the second control terminal of the driving transistor have different potentials.

3. The pixel circuit as described in claim 2, wherein the preset voltage is a reference voltage or DC voltage lower than the high voltage of the system, and in a pre-lighting stage of the night mode, the second transistor is turned off, and the first transistor is turned on according to the first scan signal, charging the second control terminal of the driving transistor to the reference voltage or the DC voltage, so as to partially turn on the second channel controlled by the second control terminal of the driving transistor.

4. The pixel circuit as described in claim 3, wherein in a first light-emitting stage of the night mode, the second transistor is turned off, the first transistor is turned on according to the first scan signal, the first control terminal of the driving transistor controls the first channel to be fully turned on, the second control terminal of the driving transistor controls the second channel to be partially turned on, and the light-emitting control transistor is turned on according to the light-emitting control signal to conduct a first circuit path from the system high voltage through the driving transistor, the light-emitting control transistor and the light-emitting element to the system low voltage.

5. The pixel circuit as described in claim 2, wherein the preset voltage is the system high voltage, and in a pre-lighting stage of the night mode, the second transistor is turned off, and the first transistor is turned on according to the first scan signal, charging the second control terminal of the driving transistor to the system high voltage, so as to turn off the second channel controlled by the second control terminal of the driving transistor.

6. The pixel circuit as described in claim 5, wherein in a first light-emitting phase of the night mode, the second transistor is turned off, the first transistor is turned on according to the first scan signal, the first control terminal of the driving transistor controls the first channel to close, the second control terminal of the driving transistor controls the second channel to fully open, and the light-emitting control transistor is turned on according to the light-emitting control signal to conduct a first circuit path from the system high voltage through the driving transistor, the light-emitting control transistor and the light-emitting element to the system low voltage.

7. The pixel circuit as claimed in claim 6, wherein in daytime mode, the first control terminal and the second control terminal of the driving transistor have the same potential.

8. The pixel circuit as described in claim 7, wherein in a second light-emitting phase of the daytime mode, the first transistor is turned off, the second transistor is turned off, the first control terminal of the driving transistor controls the first channel to be fully turned on, the second control terminal of the driving transistor controls the second channel to be fully turned on, and the light-emitting control transistor is turned on according to the light-emitting control signal to conduct a second circuit path from the system high voltage through the driving transistor, the light-emitting control transistor and the light-emitting element to the system low voltage.

9. The pixel circuitry as claimed in claim 8, wherein a first current flowing through the first circuit path during the first illumination phase of the night mode is less than a second current flowing through the second circuit path during the second illumination phase of the day mode.

10. A vehicle display device, comprising: A base, located in the driver's area of ​​a vehicle; and a display panel disposed on the base, wherein the display panel includes pixel circuitry as described in claim 1.

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