Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-2019294573-A1
Application number	US-201916438056-A
Country	US
Kind code	A1
Filing date	Jun 11, 2019
Priority date	Dec 8, 2016
Publication date	Sep 26, 2019
Grant date	—

Abstract

A display device includes a first connector which receives a first image signal and first driving power, a second connector which receives a second image signal and second driving power, a first control unit which processes the first image signal and the first driving power, a second control unit which processes the second image signal and the second driving power, a power management unit which receives the first and second driving powers from the first control unit and the second control unit, measures the first and second driving powers, and provides information about the first driving power and information about the second driving power to the first and second control units, and a display unit which receives one of the first and second image signals from one of the first and second control units and displays one of the first and second image signals.

First claim

What is claimed is:

1 . A display device comprising:
a first connector which receives a first image signal and first driving power; a second connector which receives second driving power; a first control unit which processes the first image signal and the first driving power provided through the first connector; a second control unit which processes the second driving power provided through the second connector; a power management unit which receives the first driving power and the second driving power from the first control unit and the second control unit, measures the first driving power and the second driving power, and provides information about the first driving power and information about the second driving power to the first control unit and the second control unit; and a display unit which receives the first image signal from the first control unit and displays the first image signal.

2 . The display device of claim 1 , wherein when the first driving power having a voltage level sufficient to drive the display unit is provided through the first connector, the display unit is driven by the first driving power, and the second control unit receives the first driving power and provides the first driving power to the second connector.

3 . The display device of claim 2 , wherein when the first image signal is provided through the first connector and when no image signal is provided to the second connector, the display unit displays an image corresponding to the first image signal.

4 . The display device of claim 2 , wherein when a second image signal is provided through the second connector and when no image signal is provided to the first connector, the second control unit further processes the second Image signal, and
wherein the display unit displays an image corresponding to the second image signal.

5 . The display device of claim 1 , wherein the power management unit comprises a reference voltage detection unit and a power supply unit, wherein the reference voltage detection unit provides a reference voltage detection signal to the power supply unit when a voltage level of at least one of the first driving power and the second driving power is higher than that of a reference voltage, and the power supply unit, when receiving the reference voltage detection signal, provides one of the first driving power and the second driving power having a voltage level higher than that of the reference voltage to the display unit and the first control unit or the second control unit.

6 . The display device of claim 5 , wherein the voltage level of the reference voltage is a minimum voltage level desired to operate the display unit.

7 . The display device of claim 5 , wherein the reference voltage comprises a first reference voltage and a second reference voltage, wherein a voltage level of the first reference voltage is defined as a voltage level which is able to operate the display unit and charge an external device connected to the second control unit, and a voltage level of the second reference voltage is defined as a voltage level which is able to operate the display unit but is not able to charge the external device connected to the second control unit.

8 . The display device of claim 1 , further comprising an image signal selection unit,
wherein the second connector further receives a second image signal, wherein the second control unit further processes the second image signal, and wherein the image signal selection unit receives the first image signal and the second image signal from the first control unit and the second control unit and provides one of the first image signal and the second image signal to the display unit.

9 . The display device of claim 8 , wherein the first control unit provides an image selection control signal to the image signal selection unit, and the image signal selection unit provides the first image signal or the second image signal to the display unit according to a voltage level of the image selection control signal.

10 . The display device of claim 1 , wherein the first image signal and the first driving power are provided to the first connector through one cable.

11 . The display device of claim 1 , wherein the first connector and the second connector are connectors conforming to a universal serial bus standard.

12 . A display device comprising:
a first connector which receives a first image signal and first driving power from a first external device; a second connector which receives second driving power from a second external device; a display unit which displays an image corresponding to the first image signal, wherein the first connector and the second connector conform to a universal serial bus standard, and the display unit is driven by the first driving power or the second driving power, and wherein a driving power supply test is performed through at least one of the first and second connectors to determine whether the corresponding first or second external device connected thereto will function as a host or a device to supply or receive the first driving power or second driving power.

13 . The display device of claim 12 , wherein the display unit is not provided with power other than at least one of the first driving power and the second driving power.

14 . The display device of claim 12 , further comprising at least one third connector which receives a third image signal or third driving power, wherein the third connector conforms to the universal serial bus standard, and the display unit displays an image corresponding to one of the first image signal and the third image signal and is driven by at least one of the first through third driving power.

15 . The display device of claim 14 , wherein the second connector further receives a second image signal, and
wherein the display unit displays an image corresponding to at least one of the first image signal, the second image signal and the third image signal.

16 . The display device of claim 12 , further comprising a fourth connector which receives various external signals,
wherein the fourth connector is different from the universal serial bus standard, and the external signals provided through the fourth connector do not affect the driving of the display unit.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Jin Kyu
• Choi Kyung Uk
• Goh Joon Chul

Classifications

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• G09G2370/045

  using multiple communication channels, e.g. parallel and serial · 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

• G06F13/385 Primary

  for adaptation of a particular data processing system to different peripheral devices · CPC title

• G09G2370/12

  Use of DVI or HDMI protocol in interfaces along the display data pipeline · CPC title