Display driver module, display system and power timing control method

Abstract

This application provides a display driver module, a display system, and a power timing control method. The display system includes an energy harvesting device, a power management chip, a driver chip, and a display panel. The energy harvesting device generates a first voltage, and the power management chip converts the first voltage into a second voltage under the control of an enable signal. The driver chip receives the first voltage and the second voltage respectively, and generates a display drive signal based on the first voltage and the second voltage. The display panel receives the display drive signal, which is used to update the screen display. This application solves the power consumption problem of prior art display systems and improves the stability of screen update operations in battery-free display system applications.

Claims

1. A display driving module, comprising an energy harvesting device, a power management chip, a driver chip, and a control unit; wherein the energy harvesting device is configured to generate a first voltage and a first supply voltage, and output the first supply voltage to the control unit; the power management chip is electrically connected to the energy harvesting device, and is configured to receive the first voltage and convert the first voltage into a second voltage under the control of an enable signal; the driver chip is electrically connected to the energy harvesting device and the power management chip, and is configured to receive the first voltage and the second voltage respectively, and generate a display driving signal based on the first voltage and the second voltage; wherein, The control unit outputs the enable signal to the power management chip; wherein, during a first time period, the energy harvesting device provides a first supply voltage to the control unit; wherein, during the first time period, the state of the enable signal controls the operating state of the power management chip; wherein, after the energy harvesting device provides the first voltage to the power management chip, the power management chip, controlled by the state of the enable signal, converts the first voltage into a second voltage to provide the second voltage to the driver chip.

2. The display driver module as described in claim 1, wherein, The control unit is electrically connected to the power management chip and is used to output the enable signal to the power management chip.

3. The display driver module as described in claim 1, wherein, During the first time period, the control unit provides an enable signal with a first potential state to the power management chip, so that the power management chip is not started, and the control unit generates a second supply voltage according to the first supply voltage, and the control unit transmits the second supply voltage to the driver chip to be used as the second voltage for the driver chip; During the second time period, the control unit provides an enable signal with a second potential state to the power management chip, so that the power management chip is started, and the power management chip converts the first voltage provided by the energy harvesting device into the second voltage, and provides the second voltage to the driver chip for use.

4. The display driver module as described in claim 1, wherein, The display driving module further includes a switching device electrically connected between the energy harvesting device and the driving chip. During the first time period, the control unit controls the switching device to be in an off state. During the second time period, the control unit outputs an enable signal with a second potential state to the power management chip to enable the power management chip to operate. The power management chip is used to convert the first voltage into the second voltage to provide the second voltage to the driving chip. During the third time period, the driving chip receives the second voltage and outputs a feedback signal with a second potential state to the control unit. During the fourth time period, the control unit outputs a control signal with a second potential state to the switching device based on the feedback signal with the second potential state, so as to control the switching device to conduct the connection between the energy harvesting device and the driving chip, so that the energy harvesting device outputs the first voltage to the driving chip.

5. The display driver module as described in claim 1, wherein, The display driving module further includes a switching device and an inverter. The switching device is electrically connected between the control unit and the driving chip, and the inverter is electrically connected between the control unit and the switching device. During the first time period, the control unit provides an enable signal with a first potential state to the power management chip and the inverter, so that the power management chip is not working. The energy harvesting device provides a first supply voltage to the control unit. The control unit generates a second supply voltage based on the first supply voltage. The inverter generates a control signal with a second potential state to the switching device, so that the switching device is turned on, and the second supply voltage is output as the second voltage to the driving chip. During the second time period, the driving chip receives the second voltage and outputs a feedback signal with a second potential state to the control unit. During the third time period, the control unit outputs an enable signal with a second potential state to the power management chip and the inverter, so that the power management chip starts up to convert the first voltage output by the energy harvesting device into the second voltage and outputs the second voltage to the drive chip for use. The inverter generates a control signal with a first potential state to the switching device to control the switching device to be in the off state.

6. The display driver module as described in claim 3, wherein, The display driving module further includes a diode electrically connected between the control unit and the driving chip. During the first time period, the control unit provides an enable signal with a first potential state to the power management chip, so that the power management chip is not started. The control unit generates a second supply voltage based on the first supply voltage. The control unit transmits the second supply voltage to the driving chip after passing through the diode, so as to provide the second voltage to the driving chip. During the second time period, the control unit provides an enable signal with a second potential state to the power management chip, so that the power management chip is started. The power management chip converts the first voltage provided by the energy harvesting device into the second voltage and provides the second voltage to the driving chip.

7. The display driver module as described in claim 1, wherein, The energy harvesting device is used to harvest energy from the antenna to generate the first voltage; wherein the energy harvesting device is an NFC energy harvesting device.

8. A display system comprising a display panel and a display driving module as described in any one of claims 1 to 7; the display panel is electrically connected to the display driving module, the display panel is configured to receive a display driving signal from the display driving module, and the display driving signal is configured to update the screen of the display panel.

9. A power timing control method applied to a display system, the display system comprising an energy harvesting device, a power management chip, a driver chip, a display panel, and a control unit, the power timing control method comprising: The energy harvesting device generates a first voltage and a first supply voltage, and supplies the first voltage to the power management chip and the driver chip respectively, and outputs the first supply voltage to the control unit; An enable signal is provided to the power management chip, causing the power management chip to convert the first voltage to a second voltage under the control of the enable signal; the second voltage is directly provided to the driver chip, and a display drive signal is generated according to the first voltage and the second voltage; the display drive signal is provided to the display panel, and the display drive signal is used to update the screen of the display panel; wherein, the control unit outputs the enable signal to the power management chip; wherein, during a first time period, the energy harvesting device provides a first supply voltage to the control unit; wherein, during the first time period, the state of the enable signal controls the operating state of the power management chip; wherein, after the energy harvesting device provides the first voltage to the power management chip, the power management chip, controlled by the state of the enable signal, converts the first voltage to the second voltage to provide the second voltage to the driver chip.

10. The power supply timing control method as described in claim 9, wherein, The display system further includes a switching device electrically connected between the energy harvesting device and the driving chip. The power timing control method further includes: controlling the switching device to be in an off state during a first time period; providing an enable signal with a second potential state to the power management chip during a second time period to enable the power management chip to operate, wherein the power management chip converts the first voltage into the second voltage to provide the second voltage to the driving chip; providing a feedback signal with a second potential state to the control unit during a third time period; and providing a control signal with a second potential state to the switching device during a fourth time period to control the switching device to connect the energy harvesting device and the driving chip, thereby enabling the energy harvesting device to output the first voltage to the driving chip.

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