Screen drive circuit, display, and electronic device

Patent metadata

Field	Value
Publication number	US-12562127-B2
Application number	US-202318703084-A
Country	US
Kind code	B2
Filing date	Apr 13, 2023
Priority date	May 5, 2022
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

This application provides a screen drive circuit, a display, and an electronic device. An input terminal of a drive selection circuit in the screen drive circuit inputs a row drive signal, and a control terminal of the drive selection circuit inputs a row address selection signal. The drive selection circuit outputs, based on the row address selection signal, the row drive signal corresponding to a pixel row whose displayed content changes. The row address selection signal is generated, by a display drive chip connected to the display, based on the pixel row whose displayed content changes. It can be learned that, the screen drive circuit can separately select, based on an update frequency of displayed content on the display, some pixel rows in a pixel array for content refreshing, thereby implementing local refreshing based on the displayed content.

First claim

The invention claimed is:

1 . A screen drive circuit, applied to a display and comprising an array drive circuit and a drive selection circuit, wherein the array drive circuit comprises a row drive circuit and a column drive circuit;
the row drive circuit generates a row drive signal that is used to drive a pixel row in the display; and an input terminal of the drive selection circuit is connected to an output terminal of the row drive circuit, a control terminal of the drive selection circuit receives a row address selection signal and outputs, based on the row address selection signal, the row drive signal corresponding to a pixel row whose displayed content changes, and the row address selection signal is generated, by a display drive chip connected to the display, based on the pixel row whose displayed content changes; wherein the drive selection circuit comprises a selection circuit and a drive circuit; wherein an input terminal of the selection circuit is connected to the output terminal of the row drive circuit, a control terminal of the selection circuit receives the row address selection signal, and an output terminal of the selection circuit is connected to an input terminal of the drive circuit and is configured to output a pulse signal with a same frequency as the row drive signal when the row address selection signal is valid, and output a write invalid signal when the row address selection signal is invalid; wherein the drive circuit is configured to generate, based on the pulse signal, a write drive signal output with a driving capability, or output the write invalid signal; wherein the selection circuit comprises a first series branch, a second series branch, a third series branch, and a fourth series branch; wherein the first series branch comprises a first switching transistor and a second switching transistor that are connected in series, a control terminal of the first switching transistor is the input terminal of the selection circuit, a control terminal of the second switching transistor inputs a first voltage signal, and a first terminal of the first switching transistor is the output terminal of the selection circuit; wherein the second series branch is connected in parallel to the first series branch, the second series branch comprises a third switching transistor and a fourth switching transistor that are connected in series, a common terminal of the third switching transistor and the fourth switching transistor inputs a negative voltage signal, a first terminal of the third switching transistor is connected to the output terminal of the selection circuit, gates of the third switching transistor and the fourth switching transistor are connected to a second terminal of the fourth switching transistor, and the second terminal of the fourth switching transistor is connected to the first series branch; wherein the third series branch comprises a fifth switching transistor and a sixth switching transistor that are connected in series, a first terminal of the fifth switching transistor inputs the negative voltage signal, a second terminal of the sixth switching transistor inputs a positive voltage signal, and gates of the fifth switching transistor and the sixth switching transistor are connected to a common terminal of the first switching transistor and the second switching transistor; and wherein the fourth series branch comprises a seventh switching transistor and an eighth switching transistor that are connected in series, a first terminal of the seventh switching transistor inputs the positive voltage signal, a second terminal of the eighth switching transistor inputs the negative voltage signal, gates of the seventh switching transistor and the eighth switching transistor are connected to a serially-connected node of the fifth switching transistor and the sixth switching transistor and input the row address selection signal, and a serially-connected node of the seventh switching transistor and the eighth switching transistor is connected to the common terminal of the first switching transistor and the second switching transistor.

2 . The screen drive circuit according to claim 1 , wherein the row address selection signal is valid when it is a low-level signal and invalid when it is a high-level signal.

3 . The screen drive circuit according to claim 1 , wherein the drive circuit comprises a first CMOS inverter, an input terminal of the first CMOS inverter is connected to the output terminal of the selection circuit, an output terminal of the first CMOS inverter is an output terminal of the drive selection circuit, a first power terminal of the first CMOS inverter inputs the positive voltage signal, and a second power terminal of the first CMOS inverter inputs the negative voltage signal.

4 . The screen drive circuit according to claim 3 , wherein:
a control terminal of a ninth switching transistor inputs the row address selection signal, and a first terminal of the ninth switching transistor inputs the positive voltage signal; a tenth switching transistor is connected in series to an eleventh switching transistor, a first terminal of the tenth switching transistor is connected to a second terminal of the ninth switching transistor, a control terminal of the tenth switching transistor inputs the first voltage signal, a second terminal of the eleventh switching transistor inputs the negative voltage signal, and a control terminal of the eleventh switching transistor is connected to a first terminal of the eleventh switching transistor; and a twelfth switching transistor is connected in series to a thirteenth switching transistor, a control terminal of the twelfth switching transistor is connected to the output terminal of the row drive circuit, a second terminal of the twelfth switching transistor is connected to a common node of the tenth switching transistor and the ninth switching transistor, a second terminal of the thirteenth switching transistor inputs the negative voltage signal, and a common terminal of the twelfth switching transistor and the thirteenth switching transistor is connected to the input terminal of the drive circuit.

5 . The screen drive circuit according to claim 3 , wherein the selection circuit comprises:
a fourteenth switching transistor, a fifteenth switching transistor, and a sixteenth switching transistor that are sequentially connected in series, wherein a first terminal of the fourteenth switching transistor inputs the positive voltage signal, and a second terminal of the sixteenth switching transistor inputs the negative voltage signal; control terminals of the fourteenth switching transistor and the sixteenth switching transistor are connected to the row drive circuit, and a control terminal of the fifteenth switching transistor inputs the row address selection signal; a common terminal of the fifteenth switching transistor and the sixteenth switching transistor is connected to the input terminal of the drive circuit; and a first terminal of a seventeenth switching transistor is connected to a second terminal of the fifteenth switching transistor, a second terminal of the seventeenth switching transistor inputs the negative voltage signal, and a control terminal of the seventeenth switching transistor inputs the row address selection signal.

6 . The screen drive circuit according to claim 3 , wherein the selection circuit further comprises a second CMOS inverter, a third CMOS inverter, a fifth series branch, a fourth CMOS inverter, and a fifth CMOS inverter;
an input terminal of the second CMOS inverter is connected to an output terminal of the row drive circuit, and an output terminal of the second CMOS inverter is connected to an input terminal of the third CMOS inverter; the fifth series branch comprises an eighteenth swi

Assignees

• Honor Device Co Ltd

Inventors

• An Yabin
• Su Yi
• He Haiming
• Zhao Mingyuan

Classifications

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2310/04

  Partial updating of the display screen · CPC title

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title

• G09G3/36

  using liquid crystals · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title