Data source and display having power circuits providing different output voltages based on duty cycle

Patent metadata

Field	Value
Publication number	US-10719114-B2
Application number	US-201815966808-A
Country	US
Kind code	B2
Filing date	Apr 30, 2018
Priority date	Apr 27, 2011
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

An embodiment is a circuit for use with a display device, the circuit including: a first input node configured to be operatively coupled to a first port of a data source device that provides the display device with data, to receive a first direct voltage used for a real-time display of the data on the display device; and at least one output node, configured to operatively provide the display device with at least one output voltage generated based on the first direct voltage, wherein the first port is isolated from a data port used to transmit the data.

First claim

What is claimed is:

1. A display device, comprising:
a data-receiving circuit comprising a data port configured to be coupled to a first port of a data source device, wherein the data port of the data-receiving circuit is configured to receive data for use in the display device via the first port of the data source device;
a power circuit comprising a first power port that is separate from the data port of the data-receiving circuit, wherein the first power port of the power circuit is configured to be coupled to a second port of the data source device and to receive a first power signal from the second port of the data source device and to provide the first power signal to the display device for use in the display device; and
a controller directly coupled to an output of the data-receiving circuit and to the power circuit through a connection that is separate from any connection between the power circuit and the display device so that the first power signal is to be provided to the display device outside of a path of the controller, wherein the power circuit is configured to provide a supply power to the controller, and wherein the power circuit is configured to provide the supply power to the data-receiving circuit under a control of the controller, wherein a first electrical path between the data port of the data-receiving circuit and the first port of the data source device is devoid of a circuit branch that is input into the power circuit, wherein the controller is connected to the data-receiving circuit by a second electrical path without the power circuit and the first electrical path as intermediaries.

2. The display device of claim 1 , wherein the first power port is configured to receive the first power signal from the second port of the data source device without the controller being coupled between the second port of the data source device and the first power port of the power circuit.

3. The display device of claim 1 , wherein the power circuit further comprises:
a controllable switch having a first terminal tied to the first power port, wherein the controllable switch is configured to be controlled by the controller by a control signal; and
an inductive element having a first terminal tied to a second terminal of the controllable switch, the inductive element further having a second terminal tied to an output node of the power circuit.

4. The display device of claim 3 , wherein the control signal comprises a pulse-width modulated (PWM) signal, and wherein the supply power provided by the power circuit to the controller is dependent on a duty cycle of the PWM signal.

5. The display device of claim 1 , wherein the power circuit further comprises a second power port that is separate from the data port of the data-receiving circuit and the first power port of the power circuit, wherein the second power port of the power circuit is configured to receive a second power signal from an external source other than the data source device.

6. The display device of claim 5 , wherein a voltage of the first power signal is different from a voltage of the second power signal.

7. The display device of claim 5 , wherein the power circuit further comprises:
a switching circuit configured to switch between the first power port and the second power port, wherein the switching circuit is configured to switch to the first power port in response to a voltage at the first power port being higher than a voltage at the second power port, and to switch to the second power port in response to the voltage at the first power port being less than the voltage at the second power port.

8. The display device of claim 1 , wherein the power circuit comprises a DC-DC voltage convertor configured to convert the first power signal to the supply power.

9. The display device of claim 1 , wherein the first power port is further configured to receive a reference voltage, different from the first power signal, for use in the display device via the second port of the data source device.

10. The display device of claim 1 , wherein the first power port is further configured to connect to an overcurrent circuit coupled to the first power port, wherein the overcurrent circuit is configured to limit a current drawn by the display device.

11. A display device, comprising:
a data receiving module comprising a data port configured to be coupled to a first port of a data source device and receive data for use in the display device;
a power module comprising:
a first power port that is separate from the data port of the data receiving module and configured to be coupled to a second port of the data source device, the first power port being configured to receive a first power signal and provide the first power signal to the display device, wherein the data port of the data receiving module is coupled to the first port of the data source device by a first electrical path that is devoid of a branch that is input into the power module; and
a second power port that is separate from the data port of the data receiving module and the first power port, the second power port being configured to receive a second power signal from a source other than the data source device, wherein the second power signal is configured to provide power to the power module when power from the data source device is unavailable; and

a controller directly coupled to an output of the data receiving module and to the power module, wherein the controller is connected to the data receiving module by a second electrical path without the power module and the first electrical path as intervening circuit elements such that no power is provided to the data receiving module via the first electrical path, wherein the second port of the data source device and the first power port of the power module are coupled without the controller being there-between.

12. The display device of claim 11 , wherein the power module is configured to provide a supply voltage to the data receiving module under a control of the controller.

13. The display device of claim 11 , wherein the power module further comprises:
a DC-DC voltage converter connected to the first power port and the second power port, the DC-DC voltage converter comprising a switch module configured to switch to the first power port in response to a voltage at the first power port being higher than a voltage at the second power port and to switch to the second power port in response to the voltage at the first power port being unavailable or lower than the voltage at the second power port; and
a plurality of power circuits connected to the switch module of the DC-DC voltage converter, wherein each of the plurality of power circuits receives power from the switch module.

14. The display device of claim 13 , wherein each of the plurality of power circuits comprises:
a switch and inductor circuit connected to the controller, wherein the controller is configured to generate a separate PWM control signal for each switch and inductor circuit, wherein the separate PWM control signals have different duty cycles, and wherein each of the plurality of power circuits is configured to generate a different output voltage based on a duty cycle of a respective PWM control signal associated therewith.

15. The display device of claim 11 , wherein the first power port is further configured to receive a reference voltage, different from the first power signal, for use in the display device via the second port of the data source device.

16. The display device of claim 11 , wherein the first power port is further configured to connect to an overcurr

Assignees

• Stmicroelectronics Shenzhen R&D Co Ltd
• St Microelectronics Ltd

Inventors

• Lin Andy
• Yoon Johnny
• Sheng Danny

Classifications

• G09G2330/04

  Display protection · CPC title

• G09G3/2092

  Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165) · CPC title

• G06F1/266 Primary

  Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title