KR20090060472A - Image display device and method of controlling the same - Google Patents

Image display device and method of controlling the same Download PDF

Info

Publication number
KR20090060472A
KR20090060472A KR1020070127291A KR20070127291A KR20090060472A KR 20090060472 A KR20090060472 A KR 20090060472A KR 1020070127291 A KR1020070127291 A KR 1020070127291A KR 20070127291 A KR20070127291 A KR 20070127291A KR 20090060472 A KR20090060472 A KR 20090060472A
Authority
KR
South Korea
Prior art keywords
edid data
data
edid
external device
auxiliary
Prior art date
Application number
KR1020070127291A
Other languages
Korean (ko)
Inventor
장효상
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020070127291A priority Critical patent/KR20090060472A/en
Publication of KR20090060472A publication Critical patent/KR20090060472A/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44231—Monitoring of peripheral device or external card, e.g. to detect processing problems in a handheld device or the failure of an external recording device
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
    • G09G2370/045—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial
    • G09G2370/047—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial using display data channel standard [DDC] communication
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/12—Use of DVI or HDMI protocol in interfaces along the display data pipeline

Abstract

The present invention relates to an image display device, and more particularly, to an algorithm capable of recovering an error in transmission of Extended Display Indentification Data (EDID) data of an image display device.

That is, the present invention additionally codes and stores auxiliary EDID data in a system memory in which firmware for driving a system is stored, and retransmits the auxiliary EDID data when main EDID data is not normally transmitted due to a DDC communication error. It is.

According to the present invention, the image display device and the control method thereof support auxiliary EDID data stored in the system memory when the EDID data stored in the primary memory part fails due to a DDC communication error. The display error can be prevented in advance, and in any case, an image provided from an external device is normally provided, thereby improving user satisfaction.

Description

Image display device and method of controlling the same}

The present invention relates to an image display device, and more particularly, to an algorithm capable of recovering an error in transmission of Extended Display Indentification Data (EDID) data of an image display device.

Recently, as the display trend is digitized, various types of input terminals such as RGB and high-definition multimedia interface (HDMI) are provided on the rear of the video display device, and an increasing number of cases are displayed by connecting external devices to the RGB and HDMI interfaces. to be.

In this case, in order to display an image through the RGB and HDMI interface, EDID (Extended Display Indentification Data), that is, display information that can be represented by an image display device, must be provided to the external device through DDC (display data channel) communication.

The display data channel (DDC) supports configuration information for optimizing an image display device, control information of the image display device, and a data channel for a connection bus between host peripheral devices through the image display device. It is mainly used to convey the configuration information and control information of the video display device rather than the purpose.

The DDC adopts I2C, and EDID (Extended Display Indentification Data) is adopted as a transmission file format. The EDID (Extended Display Indentification Data) is data that records the type and other information of an image format supported by an image display device such as a TV or a monitor.

In other words, the EDID (Extended Display Indentification Data) is data indicating the display capability of an image display device. The monitor may support a Plug & Play function, and the EDID data may include a producer, a producer, a product of the product. The year and month of manufacture, the resolution and color coordinates of the product are stored in the EEPROM (Electrically Eraserable Programmable), and the system reads the EDID data contained in the EEPROM (Electrically Eraserable Programmable) to grasp information about the product.

Accordingly, the external device reads EDID (Extended Display Indentification Data) data stored in the image display device, and accordingly sends the image suitable for the image display device, so that the EDID (High Extended Display Indentification Data) information is HDMI (High Definition) Essential for Multimedia Interface (DVI), Digital Visual Interface (DVI) and PC input.

However, if a communication error occurs while performing DDC (display data channel) communication to transmit the EDID information, an abnormal screen appears on the video display device or the video itself is not input through the external device. If it does not happen.

That is, when the DDC communication error occurs (electrostatic, voltage level Under, Over, Timing error ...), if the corresponding EDID data is not transmitted to the external device, the user may not see the normal screen and may also receive no signal (No-signal). There is a problem that the screen itself cannot be seen. In this case, if you are a PC user, you may experience abnormal operation, which may prevent you from booting.

The present invention has been made to solve the above problems, and an object thereof is to prevent an error phenomenon caused by a failure of the EDID data transmission when an EDID transmission fails.

Another object of the present invention is to enable the corresponding EDID data to be transmitted to an external device currently connected using auxiliary EDID data when a DDC communication error occurs.

According to an aspect of the present invention, an image display device includes: an external interface unit for performing an interface with an external device; A memory unit that stores EDID (Extended Display Indentification Data) data; And a controller configured to transmit EDID data stored in the memory unit through the external interface unit and determine whether to transmit auxiliary EDID data based on the transmission state of the EDID data when the connection of the external device is detected.

In addition, the control method of the image display device according to the present invention for achieving the above object comprises the steps of sensing the connection of the external device; Transmitting corresponding EDID data to the connected external device when the connection of the external device is detected; Determining a transmission state of the transmitted EDID data; And transmitting auxiliary EDID data based on the transmission state of the EDID data.

According to the present invention, the image display device and the control method thereof support auxiliary EDID data stored in the system memory when the EDID data stored in the primary memory part fails due to a DDC communication error. The display error can be prevented in advance, and in any case, an image provided from an external device is normally provided, thereby improving user satisfaction.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of other inventive inventions or the scope of the present invention can be easily made by adding, changing, or deleting other elements. I can suggest.

1 is a block diagram showing the configuration of an image display device according to the present invention, Figure 2 is a flow chart for explaining step by step the control method of the image display device according to the present invention.

First, the system according to the present invention includes an external device 10 and an image display device 100 as shown in FIG.

The image display device 100 may be a TV, for example, and serves to receive a video and audio signal provided from the external device 10 and deliver the same to a user.

In addition, the external device 10 may be configured to include a first external device, a second external device, ... N-th external device, which may be a game machine, a set-top box, a DVD player, a PC, etc. The video display device 100 is connected to the DVI or HDMI interface to provide data of various formats.

The external device 10 may be connected to each port of the image display device 100, and a plurality of external devices may be connected to one port.

In addition, the image display device 100 includes an external interface unit 110 for performing an interface with an external device 10, a memory unit 120 storing EDID (Extended Display Indentification Data) data, and the external device. The image processing unit 130 for signal processing the image signal transmitted through the display, the display unit 140 for displaying the image signal processed by the image processing unit 130 and the external interface when the connection of the external device is detected A control unit 150 for transmitting the EDID data stored in the memory unit 120 to the external device 10 through the unit 110 and determining whether to transmit the auxiliary EDID data according to the transmission state of the EDID data; It is configured to include a system memory 155 provided in the control unit 150 to store auxiliary data and data for driving the system.

The operation of the image display device according to the present invention configured as described above is as follows. In addition, the EDID data used in the detailed description of the present invention is data stored in the memory unit 120, and the auxiliary EDID data is data provided in the system memory 155 of the controller 150.

The external interface 110 typically includes a data line for transmitting data provided through the external device, and a DDC communication line for performing DDC communication.

Here, the DDC (Display Data Channel) is a communication channel between an image display device and an external device, and is a protocol defined by the Video Electronic Standards Association (VESA), a non-profit corporation formed between computer and peripheral equipment companies in the United States. to be.

That is, the DDC transmission method defines a communication channel between an image display device and a peripheral device, and transmits display characteristic information (eg, EDID, etc.) stored in the image display device to an external device, or uses a specific input device on a PC. Refers to a protocol for changing display device information.

First, when the external device 10 is connected, EDID data, which is capability information that can be displayed by the current video display device 100, must be transmitted to the external device 10 through the DDC communication line. The device 10 provides a corresponding video signal to the video display device 100 based on the transmitted EDID data.

However, if an external disturbance or an internal disturbance (electrostatic, voltage level Under, Over, Timing error ...) occurs during the DDC communication at this time, the DDC communication is not normally performed, and thus a communication error occurs. The EDID data is not normally transmitted to the external device.

Accordingly, the controller 150 controls the transmission of the EDID data, determines the transmission state of the EDID data, and determines whether to transmit the auxiliary EDID data.

That is, when the EDID data is not normally transmitted due to the DDC communication error, the request for retransmission of the EDID data is requested. If the retransmission of the EDID data succeeds according to the request for retransmission of the EDID data, the external device 10 The data is transmitted to the image display device 100.

However, when the retransmission of the EDID data fails, the external device does not transmit the clock information and the sync signal to the video display device.

Therefore, the controller 150 detects the clock information and the sync signal provided from the external device for a predetermined time, and when the clock information and the sync signal are normally detected, determines that the EDID data has been normally transmitted, and determines the clock information and When the sync signal is not normally detected (in case of no input itself), a signal for transmitting the auxiliary EDID data is generated.

The controller 150 extracts auxiliary EDID data from the system memory 155 in which data for driving a system is stored according to the generated signal, and transmits the extracted auxiliary EDID data to the external device 10 through an auxiliary DDC communication line. send.

As such, the controller 150 primarily transmits the EDID data previously stored in the memory unit 120 to the external device, determines the transmission state of the EDID data transmitted to the external device, and transmits the auxiliary EDID data. By determining the, it is possible to support the secondary EDID data even in the EDID data transmission failure situation of the primary memory unit 120.

Accordingly, when the image display device according to the present invention fails to transmit the EDID data stored in the primary memory unit due to a DDC communication error, by supporting the auxiliary EDID data stored in the system memory, the display error according to the EDID transmission failure situation Can be prevented in advance, and in any case improves user satisfaction by providing an image provided from an external device normally.

In the control method of the image display device according to the present invention configured as described above, as shown in Fig. 2, first, it is determined whether the connection of the external device is detected (S10).

Subsequently, when the connection of the external device is detected (S10), the corresponding EDID data is transmitted to the connected external device (S20).

Then, the transmission state of the transmitted EDID data is checked (S30). That is, it is checked whether normal clock (CLK) information and a sync signal are transmitted from the external device according to the transmitted EDID data.

Subsequently, it is determined whether the EDID data is normally transmitted (S40). That is, when the EDID data is not normally transmitted through a DDC communication error, normal clock information and a sync signal are not transmitted from the external device, and it is detected for a predetermined time to determine whether the EDID data is normally transmitted.

When the EDID data is not normally transmitted, the determination result (S40) generates a transmission request signal for transmitting auxiliary EDID data to the external device (S50).

Subsequently, auxiliary EDID data is transmitted to the external device according to the generated transmission request signal (S60).

As described above, the image display device and the control method thereof according to the present invention support auxiliary EDID data stored in the system memory 155 when a transmission failure of EDID data stored in the primary memory unit 120 occurs due to a DDC communication error. As a result, display errors due to EDID transmission failures can be prevented in advance, and in any case, an image provided from an external device is normally provided to improve user satisfaction.

1 is a block diagram showing the configuration of a video display device according to the present invention.

2 is a flowchart for explaining step by step a control method of an image display device according to the present invention;

<< Explanation of symbols for main part of drawing >>

10: external device 100: video display device

110: external interface unit 120: memory unit

130: image processing unit 140: display unit

150: control unit 155: system memory

Claims (8)

An external interface unit for performing an interface with an external device; A memory unit that stores EDID (Extended Display Indentification Data) data; And, And a controller configured to transmit EDID data stored in the memory unit through the external interface unit and determine whether to transmit auxiliary EDID data based on the transmission state of the EDID data when the connection of the external device is detected. Video display device. The method of claim 1, And the control unit determines whether to transmit the auxiliary EDID data according to whether an error of DDC communication for transmitting the EDID data occurs. The method of claim 1, And the controller determines whether to transmit the auxiliary EDID data according to a detection state of a clock CLK and a sync signal provided through the external device. The method according to any one of claims 1 to 3, And the auxiliary EDID data is stored in a system memory in which firmware for driving the system inside the controller is stored. Detecting a connection of an external device; Transmitting corresponding EDID data to the connected external device when the connection of the external device is detected; Determining a transmission state of the transmitted EDID data; And, And transmitting auxiliary EDID data based on the transmission state of the EDID data. The method of claim 5, The determining of the transmission state of the transmitted EDID data is Detecting a clock (CLK) and a sync signal provided through the external device for a predetermined time after the transmission of the EDID data; And determining the EDID data transmission state based on the detection state of the clock CLK and the sync signal. The method of claim 6, The transmitting of the secondary EDID data is When the abnormal clock (CLK) and sync (Sync) signal is provided through the external device, the control of the video display device comprising the step of transmitting the auxiliary EDID data to the external device through the auxiliary DDC line. Way. The method according to any one of claims 5 to 7, The auxiliary EDID data is stored in a space in which firmware for driving the system is stored.
KR1020070127291A 2007-12-10 2007-12-10 Image display device and method of controlling the same KR20090060472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070127291A KR20090060472A (en) 2007-12-10 2007-12-10 Image display device and method of controlling the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070127291A KR20090060472A (en) 2007-12-10 2007-12-10 Image display device and method of controlling the same

Publications (1)

Publication Number Publication Date
KR20090060472A true KR20090060472A (en) 2009-06-15

Family

ID=40990204

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070127291A KR20090060472A (en) 2007-12-10 2007-12-10 Image display device and method of controlling the same

Country Status (1)

Country Link
KR (1) KR20090060472A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023055225A1 (en) * 2021-09-30 2023-04-06 삼성전자주식회사 Electronic apparatus and controlling method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023055225A1 (en) * 2021-09-30 2023-04-06 삼성전자주식회사 Electronic apparatus and controlling method thereof

Similar Documents

Publication Publication Date Title
US8255583B2 (en) Digital interface system to support ethernet and cable connection state displaying method thereof
US9418618B2 (en) Video signal transmission apparatus, play system and video signal transmission method
US20050225547A1 (en) Display system and control method thereof
EP2023628A1 (en) Video apparatus and method for recognizing digital interface thereof
US9021151B2 (en) Circuit and method of control of DDC data transmission for video display device
WO2015137716A1 (en) Device and method for transmitting and receiving data using hdmi
EP2230840A2 (en) Apparatus to process signal of digital interface and method thereof
KR20070019107A (en) Apparatus anjd Method for controlling plural media source device connected media sink device
KR20080037239A (en) Apparatus to output signal of hdmi device and method thereof
US20080115013A1 (en) Method of authentication, and image display apparatus incorporating the method
WO2014049686A1 (en) Hdmi device, communication system, and hot-plug control method
US20190286404A1 (en) Image display device, connection method of image display device, and multi-display system
KR100751410B1 (en) The display device for checking errors about the High Definition Multimedia Interface and method for controlling the same
JP2009177269A (en) Video receiver
CN101478695A (en) Expanded display recognition data and information writing method for high-resolution multimedia interface
KR101101812B1 (en) Display apparatus and control method thereof
CN112073659A (en) HDMI (high-definition multimedia interface) control method and device and display equipment
EP4064266A1 (en) Compatibility promotion method, storage medium, device and system for hdmi
JP6053869B2 (en) Image output device, image display device, control method for image output device, and control method for image display device
JP2016163238A (en) Display device and information rewriting method
JP2012199643A (en) Communication control system and sink device
TWI627582B (en) Display apparatus and extended display identification data (edid) replacing method thereof
KR20180067108A (en) Display apparatus presenting status of external electronic apparatus and controlling method thereof
CN103500565A (en) Storage method and storage device
KR20090060472A (en) Image display device and method of controlling the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application