JP2014021415A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of reducing standby power consumption when a plurality of devices are connected.
When a connection with another display device is detected, the standby state is changed according to the standby state setting.
[Selection] Figure 1

Description

  The present invention relates to a display device, and more particularly to power consumption reduction during standby.

  2. Description of the Related Art Conventionally, a multi-display system that realizes a large screen by connecting a plurality of display devices and displaying images so as to be connected is known.

  For example, Patent Document 1 discloses a technique in which a display device detects and authenticates a connection of another display device, and performs a large screen display by changing its function when successful.

JP 2003-195843 A

  However, in the prior art disclosed in the above-mentioned patent document, since each display device does not change the function during standby, the function has redundancy, and wasteful standby power is consumed.

  In particular, when each display device has a network function with relatively high power consumption such as a local area network (LAN), there is a problem that a lot of useless standby power is consumed.

  Therefore, an object of the present invention is to provide a display device that can reduce standby power consumption when a plurality of devices are connected.

In order to achieve the above object, the present invention provides:
At least two standby states;
Standby state setting means for setting the standby state;
A display device comprising connection detection means for detecting that it is connected to another display device,
When a connection is detected by the connection detection means,
The standby state is changed according to the setting by the standby state setting means.

  According to the present invention, when connection is detected by the connection detection unit, standby power consumption when a plurality of display devices are connected can be reduced by changing the standby state according to the setting by the standby function setting unit. .

Overview of a display system using a liquid crystal projector that is an embodiment of the present invention Block diagram of a liquid crystal projector which is an embodiment of the present invention The flowchart which shows the operation | movement of the liquid-crystal projector which is an Example of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an overview of a display system using a liquid crystal projector which is an embodiment of the present invention.

  As shown in FIG. 1, the image input terminal 5 of the liquid crystal projector 1 is connected to the image output device 4, and an image is projected onto the screen 2. The network connection terminal 6 is connected to the network 3, and the RS232C terminal 7 is connected to another liquid crystal projector.

  FIG. 2 shows a block diagram of a liquid crystal projector which is an embodiment of the present invention.

  The image input unit 51 is an image input interface including the image input terminal 5, and various types of image signals are input from the image output device 4. The image input unit 51 outputs the input image signal to the image processing unit 52.

  The image processing unit 52 performs various processing such as color correction processing, gamma correction processing, resolution conversion processing, and scaling processing. The image processing unit 52 outputs the image signal subjected to these processes to the liquid crystal driving circuit 53.

  The liquid crystal driving unit 53 drives the liquid crystal panel 54 based on the input image signal. The liquid crystal panel 54 may be transmissive or reflective. In this embodiment, a projector using a liquid crystal panel is described, but other display elements such as a digital micromirror device may be used.

  On the other hand, light from the lamp 62 as a light source is guided to the liquid crystal panel 54 by an optical system (not shown). The light guided to the liquid crystal panel 54 is image-modulated and projected as an image by being projected onto the screen 2 by the projection lens 61.

  The network communication unit 57 is a communication interface including the network connection terminal 6, and the control unit 59 can communicate with an external device connected to the network 3 via the network communication unit 57.

  The serial communication unit 55 is an RS232C interface including the RS232C terminal 7, and the control unit 59 can communicate with other liquid crystal projectors connected via the serial communication unit 55.

  The connection detection unit 56 electrically or mechanically detects that the RS232C connector is connected to the serial communication unit 55, and outputs it to the control unit 59.

  The remote control receiving unit 58 receives the user's remote control operation signal and outputs the remote control operation signal to the control unit 59.

  The operation unit 60 includes a plurality of buttons for the user to perform various operations on the liquid crystal projector, and outputs an operation signal to the control unit 59 according to the user's operation.

  The user can perform standby state setting from the operation unit 60. The standby state may be set by a method using network communication, a method using serial communication, a method using remote control operation, or any other method.

  Furthermore, a nonvolatile memory such as an EEPROM or a flash memory may be provided as a storage unit, and the standby state setting stored in the nonvolatile memory may be read to set the standby state.

  The standby states that can be set include a normal standby state in which the network communication unit 57 and the remote control receiving unit 60 are enabled, and a power saving standby state in which the network communication unit 57 and the remote control receiving unit 60 are disabled. There may be any number of standby states that can be set.

  The control unit 59 includes a CPU (Central Processing Memory) and a RAM (Random Access Memory), and is connected to the image processing unit 52, the liquid crystal drive unit 53, the network communication unit 57, the serial communication unit 55, and the like. Centrally control the operation.

  In addition, the control unit 59 performs Enable / Disable control of the network communication unit 57 and the remote control reception unit 58. In addition to the Enable / Disable control, ON / OFF control of the power supply system of the network communication unit 57 and the remote control reception unit 58 may be performed.

  Further, the control unit 59 may have a function of authenticating other projectors connected via the serial communication unit 55.

  FIG. 3 is a flowchart showing the operation of the liquid crystal projector which is an embodiment of the present invention.

  As shown in FIG. 3, in step S101, it is determined whether or not the liquid crystal projector is on standby. As a result, if it is waiting, the process proceeds to step S102, and if it is not waiting, the flow is ended.

  When the process proceeds to step S102, the control unit determines whether the RS232C connector is connected to the serial communication unit. As a result, when connected, the process proceeds to step S103, and when not connected, the process proceeds to step S105.

  When the process proceeds to step S103, the control unit determines whether the standby state setting is a power saving standby state setting. As a result, when the power saving standby state is set, the process proceeds to step S104. When the power saving standby state is not set, the process proceeds to step S105.

  When the process proceeds to step S104, the network unit and the remote control receiving unit are disabled, and the flow is terminated.

  When the process proceeds to step S105, the network unit and the remote control receiving unit are enabled, and the flow is terminated.

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal projector, 2 ... Screen, 3 ... Network, 4 ... Image output device, 5 ... Image input terminal, 6 ... Network connection terminal, 7 ... RS232C terminal, 51: Image input unit, 52: Image processing unit, 53: Liquid crystal drive unit, 54: Liquid crystal panel, 55: Serial communication unit, 56: Connection detection unit, 57 ... Network communication unit, 58... Remote control reception unit, 59... Control unit, 60 .. operation unit, 61... Projection lens, 62.

Claims (7)

At least two standby states;
Standby state setting means for setting the standby state;
A display device comprising connection detection means for detecting that it is connected to another display device,
When a connection is detected by the connection detection means,
A display device, wherein the standby state is changed according to the setting by the standby state setting means.   The display device includes an authentication unit for authenticating the other display device, and after the connected display device is detected by the connection detection unit, authentication is performed by the authentication unit. Item 4. The display device according to Item 1.   The display device has, as the at least two or more standby states, a first standby state that can be used when used alone, and a second standby state that is different from the first standby state, The standby state of the display device is changed between the first standby state and the second standby state according to a detection result by the connection detection unit and a setting by the standby state setting unit. The display device according to 1.   The display device according to claim 1, wherein the second standby state consumes less standby power than the first standby state.   The display device according to claim 1, further comprising a storage unit that stores the standby state setting.   The display device according to claim 1, wherein the display device includes a communication unit capable of communicating with the other display device. The display device according to claim 1, wherein the display device includes network communication means for performing communication via a network.