Display apparatus, display drive circuit and driving method of electronic paper display unit

Patent metadata

Field	Value
Publication number	US-11640801-B2
Application number	US-202117425044-A
Country	US
Kind code	B2
Filing date	Jan 13, 2021
Priority date	Jan 23, 2020
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

The present disclosure relates to a display apparatus, a display drive circuit and a driving method of an electronic paper display unit, which relates to the field of display technology. The display drive circuit includes a display control circuit, the display control circuit includes a capacitor unit, a radio frequency circuit, a voltage collection circuit, and a control circuit. The radio frequency circuit includes an induction circuit and a communication circuit. The induction circuit can charge the capacitor unit in response to a radio frequency signal of the terminal device. The collection circuit can collect the voltage of the capacitor unit. The control circuit can perform the transmission action when the voltage of the capacitor unit reaches an operating threshold voltage of the electronic paper display unit; turn off the voltage collection circuit and the communication circuit after the transmission action is completed.

First claim

What is claimed is:

1. A display drive circuit of an electronic paper display unit, comprising a display control circuit, wherein the display control circuit comprises:
a capacitor unit;
a radio frequency circuit, connected to the capacitor unit and comprising an induction circuit and a communication circuit, wherein the induction circuit is configured to charge the capacitor unit in response to a radio frequency signal of a terminal device;
a voltage collection circuit, connected to the capacitor unit, and configured to collect a voltage of the capacitor unit; and
a control circuit, connected to the radio frequency circuit, the capacitor unit and the voltage collection circuit, and configured to perform a transmission action when the voltage of the capacitor unit reaches an operating threshold voltage of the electronic paper display unit; turn off the voltage collection circuit and the communication circuit after the transmission action is completed; perform a refresh action when the voltage of the capacitor unit reaches a refresh threshold voltage of the electronic paper display unit; and control the electronic paper display unit to be powered off after the refresh action is completed,
wherein the refresh threshold voltage is greater than the operating threshold voltage;
the transmission action comprises: controlling the communication circuit to transmit image information sent by the terminal device to the electronic paper display unit; and
the refresh action comprises: controlling the electronic paper display unit to update a display content according to the image information.

2. The display drive circuit according to claim 1 , wherein the voltage collection circuit comprises:
a voltage dividing circuit, connected to the capacitor unit, and configured to receive a voltage signal of the capacitor unit and output the collected voltage after voltage division;
an analog-to-digital converter, connected to the voltage dividing circuit, and configured to perform analog-to-digital conversion on the collected voltage to generate a conversion signal,
wherein the control circuit is connected to the analog-to-digital converter and configured to determine a voltage of the capacitor according to the conversion signal.

3. The display drive circuit according to claim 2 , wherein the voltage dividing circuit comprises:
a first voltage dividing resistor, wherein a first end of the first voltage dividing resistor is connected to the capacitor unit;
a second voltage dividing resistor, wherein a first end of the second voltage dividing resistor is connected to a second end of the first voltage dividing resistor and the analog-to-digital converter, and a second end of the second voltage dividing resistor is grounded.

4. The display drive circuit according to claim 1 , wherein the voltage collection circuit and the control circuit are integrated in an identical chip.

5. The display drive circuit according to claim 1 , wherein the communication circuit is connected to the capacitor unit through a first switch; the control circuit is configured to control the first switch to turn on or turn off the communication circuit.

6. The display drive circuit according to claim 1 , wherein the electronic paper display unit is connected to the capacitor unit through a second switch; the control unit is configured to control the second switch to power on or power off the electronic paper display unit.

7. The display drive circuit according to claim 3 , wherein the second end of the first voltage dividing resistor is connected to the first end of the second voltage dividing resistor and the analog-to-digital converter through a third switch; the control unit is configured to control the third switch to turn on or turn off the voltage dividing circuit.

8. The display drive circuit according to claim 1 , wherein the electronic paper display unit comprises an electronic paper display screen and a memory connected to each other;
the transmission action comprises: controlling the communication circuit to transmit the image information sent by the terminal device to the memory through the control circuit;
the refresh action comprises: controlling the electronic paper display screen to acquire the image information from the memory and display it.

9. The display drive circuit according to claim 1 , wherein the induction circuit comprises:
an induction coil, configured to receive the radio frequency signal of the terminal device;
an induction component, connected to the induction coil and configured to charge the capacitor unit in response to the radio frequency signal.

10. The display drive circuit according to claim 9 , wherein the capacitor unit, the induction component, the communication circuit, the voltage collection circuit and the control circuit are all arranged outside a ring-shaped area surrounded by the induction coil.

11. The display drive circuit according to claim 1 , wherein the induction circuit and the communication circuit are integrated in an identical NFC (Near Field Communication) chip.

12. The display drive circuit according to claim 1 , wherein the capacitor unit comprises a super capacitor, a first electrode of the super capacitor is connected to the radio frequency circuit and the control circuit, and a second electrode of the super capacitor is grounded.

13. A display apparatus, comprising an electronic paper display unit and a display drive circuit of an electronic paper display unit, wherein the display drive circuit comprises a display control circuit and the display control circuit comprises:
a capacitor unit;
a radio frequency circuit, connected to the capacitor unit and comprising an induction circuit and a communication circuit, wherein the induction circuit is configured to charge the capacitor unit in response to a radio frequency signal of a terminal device;
a voltage collection circuit, connected to the capacitor unit, and configured to collect a voltage of the capacitor unit; and
a control circuit, connected to the radio frequency circuit, the capacitor unit and the voltage collection circuit, and configured to perform a transmission action when the voltage of the capacitor unit reaches an operating threshold voltage of the electronic paper display unit; turn off the voltage collection circuit and the communication circuit after the transmission action is completed; perform a refresh action when the voltage of the capacitor unit reaches a refresh threshold voltage of the electronic paper display unit and control the electronic paper display unit to be powered off after the refresh action is completed,
wherein the refresh threshold voltage is greater than the operating threshold voltage;
the transmission action comprises: controlling the communication circuit to transmit image information sent by the terminal device to the electronic paper display unit; and
the refresh action comprises: controlling the electronic paper display unit to update a display content according to the image information.

14. A display drive method of an electronic paper display unit, applied to a display drive circuit of an electronic paper display unit, wherein the display drive circuit comprises a display control circuit and the display control circuit comprises: a capacitor unit; a radio frequency circuit, connected to the capacitor unit and comprising an induction circuit and a communication circuit, wherein the induction circuit is configured to charge the capacitor unit in response to a radio frequency signal of a terminal device; a voltage collection circuit, connected to the capacitor unit, and configured to collect a voltage of the capacitor

Assignees

• Boe Technology Group Co Ltd

Inventors

• Hu Kejun
• Li Jinlei
• Li Xin

Classifications

• Y02D30/70

  in wireless communication networks · CPC title

• G09G2330/027

  Arrangements or methods related to powering off a display · CPC title

• G09G2370/16

  Use of wireless transmission of display information · CPC title

• G09G3/344 Primary

  based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167) · CPC title

• G09G2380/14

  Electronic books and readers · CPC title