Electronic device and method of operation thereof

Abstract

According to one embodiment, an electronic device and an operating method thereof are disclosed, the disclosed electronic device including a receiving unit for connecting to a source device, a memory storing one or more instructions, and a processor executing the one or more instructions stored in the memory, the processor executing the one or more instructions to detect a first resolution of an input image received from the source device, determine whether to change the EDID (extended display identification data) of a display device depending on whether the detected first resolution corresponds to the EDID, change the EDID by determining to change the EDID, and receive an input image of a second resolution generated based on the changed EDID from the source device.

Description

[Technical field]

[0001] The present invention relates to an electronic device and an operating method thereof, and more particularly, to an electronic device and an operating method thereof that can receive higher resolution images from a source device by providing extended display identification data (EDID) automatic compatibility. [Background technology]

[0002] A display device can store EDID to inform a source device of the video / audio format specification information that can be supported by the display device. The display device is connected to the source device that provides content, and can provide the stored EDID to the source device upon request from the source device. The source device that receives the EDID can process the format of the content based on the EDID provided by the display device, and provide the processed content on the display device.

[0003] Most display devices currently available in the market use EDID of a pre-defined standard. However, as the resolution and frequency of the display devices increase, a problem occurs in that the existing EDID cannot express all of the video / audio format specifications that the display devices can support, and the high-resolution / high-frequency display devices use EDID of a new standard. However, since the existing source devices cannot recognize the EDID of the new standard, there is a problem in that even a display device capable of supporting a high-resolution / high-frequency content format receives content of a low-quality format from the source device. Summary of the Invention [Problem to be solved by the invention]

[0004] Various embodiments aim to provide an electronic device, and a method of operating the electronic device, capable of receiving higher resolution video from a source device by providing automatic EDID compatibility. [Means for solving the problem]

[0005] According to one embodiment, an electronic device includes a receiving unit configured to receive information including an input image from a source device, a memory storing one or more instructions, and a processor executing the one or more instructions stored in the memory, wherein the processor executes the one or more instructions to detect a first resolution of the input image received from the source device, determine whether to change the EDID based on whether the detected first resolution corresponds to at least one supported resolution associated with an EDID (extended display identification data) of the electronic device, change the EDID by determining to change the EDID, and receive an input image of a second resolution from the source device generated based on the changed EDID.

[0006] According to one embodiment, the processor may execute the one or more instructions to decide to change the EDID if it is determined that the detected first resolution does not correspond to at least one supported resolution associated with the EDID, and to output the received input image of the first resolution to a display without changing the EDID if it is determined that the detected first resolution corresponds to at least one supported resolution associated with the EDID.

[0007] According to one embodiment, the processor may execute the one or more instructions to change the number of data blocks constituting the EDID to a predetermined number, thereby modifying the EDID.

[0008] In one embodiment, the EDID is composed of a basic EDID block and one or more extended EDID blocks, and the processor can execute the one or more instructions to remove the one or more extended EDID blocks from the data blocks that make up the EDID, thereby changing the number of data blocks that make up the EDID to the default number.

[0009] In one embodiment, the processor may execute the one or more instructions to generate an updated basic EDID block by removing the one or more extended EDID blocks and changing first recommended resolution information recorded in the basic EDID block to second recommended resolution information.

[0010] According to an embodiment, a value of an information field indicating the number of extended EDID blocks included in the updated basic EDID block may be changed due to the removal of one or more extended EDID blocks.

[0011] In one embodiment, the processor executes the one or more instructions to provide a status signal to the source device to control the source device to read the changed EDID upon completion of the EDID change, and receives an EDID request from the source device to provide the changed EDID to the source device, thereby receiving an input image of the second resolution generated based on the changed EDID from the source device.

[0012] In one embodiment, the processor can execute the one or more instructions to receive the input video at the second resolution from the source device, thereby unmuting the display screen and displaying the received input video at the second resolution on the display.

[0013] According to one embodiment, the processor may execute the one or more instructions to restore the modified EDID to an original EDID upon detecting a predefined event.

[0014] According to one embodiment, the predefined event may also include at least one of: removal of a cable connecting the source device to the electronic device, entering a power management mode state, or entering a power off state.

[0015] In one embodiment, the input video at the first resolution received from the source device is also generated by the source device reading the EDID and processing the video at the first resolution, which is set as a default due to failure to parse the EDID.

[0016] In one embodiment, the processor may execute the one or more instructions to determine that the detected first resolution corresponds to at least one supported resolution associated with the EDID, thereby deciding not to change the EDID, releasing a display screen mute state, and displaying the received input video of the first resolution on the display.

[0017] According to one embodiment, the first resolution represents a lower resolution including at least one of 480p and 576p, and the second resolution is higher than the first resolution.

[0018] According to one embodiment, a method of operating an electronic device also includes an operation of detecting a first resolution of an input image received from a source device, an operation of determining whether to modify the EDID based on whether the detected first resolution corresponds to at least one supported resolution associated with an EDID of the electronic device, an operation of modifying the EDID based on a decision to modify the EDID, and an operation of receiving an input image of a second resolution from the source device, the input image being generated based on the modified EDID.

[0019] According to one embodiment, in a computer-readable recording medium having one or more programs recorded thereon to be executed by a processor of an electronic device for implementing an operating method of an electronic device, the operating method of the electronic device also includes an operation of detecting a first resolution of an input image received from a source device, an operation of determining whether to change the EDID based on whether the detected first resolution corresponds to at least one supported resolution associated with an EDID of the electronic device, an operation of changing the EDID based on a decision to change the EDID, and an operation of receiving an input image of a second resolution generated based on the changed EDID from the source device. Effect of the Invention

[0020] Various embodiments of the present disclosure may provide for automatic EDID compatibility between devices with incompatible EDIDs without user intervention. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a reference diagram for explaining the concept of how a display device can receive video in an optimal format by providing an EDID available from a source device according to the disclosed embodiments. [Diagram 2] FIG. 2 illustrates an example EDID structure. [Diagram 3] FIG. 13 illustrates an example of a third extended EDID block, according to an example. [Figure 4] 1A-1C show diagrams illustrating a 2-block EDID, a 3-block EDID, and a 4-block EDID according to an example. [Diagram 5] 1 is an example block diagram of a display device and a source device according to one embodiment. [Figure 6] FIG. 2 shows an example flowchart of a method of operating a display device, according to one embodiment. [Figure 7]1 is a flowchart illustrating a specific operation of a source device and a display device connected via an HDMI (registered trademark) cable according to an embodiment. [Figure 8] FIG. 2 is a diagram showing an example of the structure of an EDID stored in a display device 100 according to one embodiment. [Figure 9] FIG. 13 is a reference diagram for explaining an example of changing an EDID having a structure of three or more blocks into an EDID having a structure of two blocks according to an embodiment. [Figure 10] An example of changing a 4-block EDID corresponding to an HDMI Photo using EDID 1.3 version to a 2-block EDID according to one embodiment will be described. [Figure 11] Another example of changing a 4-block EDID corresponding to an HDMI Photo using EDID 1.3 version to a 2-block EDID according to an embodiment will be described. [Figure 12] 10A and 10B are diagrams illustrating an example of a specific method for changing an original EDID to a changed EDID according to an embodiment. [Figure 13] 11A and 11B are diagrams illustrating another example of a method for changing an original EDID to a changed EDID according to an embodiment. [Figure 14] 1A to 1C are diagrams illustrating a specific example of a method for changing an original EDID into a changed EDID according to an embodiment. [Figure 15] FIG. 2 illustrates an example of a method for generating and recording a modified EDID, according to one embodiment. [Figure 16] FIG. 13 illustrates another example of a method for generating and recording a modified EDID, according to one embodiment. [Figure 17] 4 is a flow chart illustrating an example of a method process for restoring a changed EDID in an electronic device to an original EDID, according to one embodiment. [Figure 18] FIG. 1 illustrates an example scenario of modifying and further restoring the original EDID according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The terms used in this specification will be briefly explained, and the present invention will be specifically described.

[0023] The terms used in the present invention are selected from currently widely used general terms as much as possible while considering the functions in the present invention, but they may vary depending on the intentions of the engineers in the field, precedents, or the emergence of new technologies. In addition, in certain cases, the applicant may arbitrarily select terms, and in such cases, the meanings of the terms will be described in detail in the description of the invention. Therefore, the terms used in the present invention must be defined based on the meanings of the terms and the overall content of the present invention, rather than simply by the names of the terms.

[0024] Throughout the specification, when a part "includes" a certain component, it does not mean excluding other components, but also means including other components, unless otherwise specified to the contrary. Furthermore, terms such as "unit" and "module" described in the specification mean a unit that processes at least one function or operation, and it may be realized by hardware or software, or a combination of hardware and software.

[0025] In the following, with reference to the accompanying drawings, the embodiments will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, in order to clearly explain the present invention, parts that are not related to the description are omitted, and similar parts are designated by similar reference numerals throughout the specification.

[0026] In the embodiments herein, the term "user" refers to a person who utilizes a control device to control the function or operation of a computing or electronic device, and may include a viewer, administrator, or installer.

[0027] FIG. 1 is a reference diagram for explaining the concept of a method for allowing a display device to receive video in an optimal format by providing extended display identification data (EDID) available from a source device according to a disclosed embodiment.

[0028] Referring to FIG. 1, the system also includes a source device 500 and a display device 100 .

[0029] The source device 500 can provide content such as video and audio to the display device 100. The source device 500 can include various types of electronic devices capable of providing content to the display device 100, such as a set-top box, a DVD player, a Blu-ray disc player, a PC, and a game console. The source device 200 can be referred to as a source device in terms of providing content, and can also be referred to as a host device, a content providing device, an electronic device, a computing device, etc.

[0030] The display device 100 can output or display the content received from the source device 500. The display device 100 may include various types of electronic devices capable of receiving and outputting content, such as a network TV, a smart TV, an Internet TV, a web TV, an IPTV, and a PC. The display device 100 may be referred to as a display device in that it receives and displays content, but may also be referred to as a content receiving device, a sink device, an electronic device, a computing device, etc.

[0031] The source device 500 and the display device 100 can transmit and receive content by being connected to each other through various connection means. The various connection means may include, for example, a cable, and the source device 500 and the display device 100 may include one or more ports for cable connection. The one or more ports may include, for example, a digital input interface such as an HDMI port, a display port, or a type C. For example, the source device 200 and the display device 100 each have an HDMI port and can communicate with each other through the port. When the source device 200 provides content to the display device 100, the source device 200 first receives EDID information provided from the display device 100, generates content in a format corresponding to the received EDID information, and provides the content to the display device 100. The EDID information is information that defines display capabilities or display functions that the display device 100 can display content with, and may include, for example, timing information and resolution information. Therefore, the source device 500 can generate a format of content to be sent to the display device 100 based on timing information and resolution information defined in the EDID information provided by the display device 100, and provide the generated format to the display device 100. For example, if the EDID information provided by the display device 100 defines that the display device 100 processes high resolution, the source device 500 can provide high resolution content to the display device 100, and if the EDID information provided by the display device 100 defines that the display device 100 processes low resolution, the source device 500 can provide low resolution content to the display device 100. Through such EDID information, the source device 200 can provide the display device 100 with content in a format that matches the display capabilities of the display device 100.

[0032] EDID information has one essential basic data block, but is structured as an extensible data block, and the display device 100 can store EDID information configured with one or more data blocks to support high resolution / high frequency. However, some source devices on the market cannot correctly parse EDID information of an extended data block structure to support high resolution / high frequency, and therefore output low-resolution content that is set as a default, or output a DVI (digital visual interface) signal without an audio signal. Therefore, in order to solve such problems, the display device 100 according to the embodiment disclosed in the present disclosure changes the EDID to an EDID that the source device 500 can parse, and provides it to the source device 500, so that the source device 500 can provide content that is more compatible with the display performance supported by the display device 100.

[0033] 1, when the display device 100 and the source device 500 are connected via a port (10), the source device 500 can read the original EDID stored in the display device 100, generate a content format based on the read original EDID, and provide the content to the display device 100. In this case, if the original EDID has an extended data block structure and the source device 200 fails to parse the original EDID, the source device 200 can format the content at a default low resolution that was set when the parsing failed, and provide the content to the display device 100 (20).

[0034] According to an embodiment, when the display apparatus 100 receives content from the source apparatus 200, the display apparatus 100 may detect attribute information of the received content (30) and determine whether the detected attribute information matches original EDID information possessed by the display apparatus 100 itself. The display apparatus 100 may determine whether the attribute information detected from the received content matches the original EDID information by various methods. For example, the display apparatus 100 may determine whether the attribute information matches the original EDID information based on resolution information and timing information detected from the received content. Alternatively, the display apparatus 100 may determine whether the received content matches the original EDID information when there is no audio signal in the received content, for example, when the received content is a DVI signal. According to an example, the display apparatus 100 may determine whether the resolution information detected from the received content matches recommended resolution information recorded in the original EDID. For example, when the resolution of the received input image is detected to be equal to or lower than the SD class (480p, 576p), the display apparatus 100 may determine whether it matches the original EDID. As another example, the display apparatus 100 may determine whether timing information detected from the received content matches recommended timing information recorded in the original EDID.

[0035] According to one embodiment, the display device 100 determines whether the attribute information detected from the received content matches the original EDID information, and if they match, the display device can unmute the display screen and output the content received from the source device 100 to the display.

[0036] According to an embodiment, the display apparatus 100 determines whether the attribute information detected from the received content matches the original EDID information. If the attribute information does not match, the display apparatus 100 modifies the original EDID (40) and transmits the modified EDID to the source apparatus 500 by controlling the source apparatus 500 to further read the modified EDID (50). For example, the display apparatus 100 may modify the original EDID having an extended data block structure into an EDID having a data block structure that the source apparatus 500 can parse. For example, the display apparatus 100 may reconstruct the original EDID consisting of three or four data blocks into two data blocks to generate the modified EDID. The display apparatus 100 may modify the EDID and provide a control signal to the source apparatus 500 to cause the source apparatus 500 to further read the modified EDID, thereby controlling the source apparatus 500 to further read the modified EDID.

[0037] According to one embodiment, the source device 500 can read and parse the modified EDID, process the format of the content according to the display device capability information contained in the modified EDID, and provide the content to the display device 100.

[0038] According to an embodiment, the display apparatus 100 receives content based on the changed EDID (70), and when the synchronization of the content signal is stabilized, the display apparatus 100 releases the mute state of the display screen, thereby outputting the content based on the changed EDID to the display (80). Specifically, the display apparatus 100 receives content from the source apparatus 500 for the first time, determines whether the received content matches the EDID information possessed by the display apparatus 100, and if the content matches, immediately releases the mute state of the display screen and outputs the content. If the content received from the source apparatus 500 does not match the EDID information possessed by the display apparatus 100, the display apparatus 100 may change the EDID and maintain the mute state of the display screen (60) until further content whose format has been changed based on the changed EDID is received. Then, when the display apparatus 100 receives content whose format has been changed based on the changed EDID, the display apparatus 100 releases the mute state of the display screen (60), thereby controlling the display apparatus 100 to output the content whose format has been changed based on the changed EDID (80). The mute state of the display screen may indicate a state in which a black image is output on the display screen of the display device.

[0039] In this way, even when the source device 500 cannot parse the original EDID of the display device 100 and transmits a predetermined low-resolution image to the display device 100, the display device 100 analyzes attributes of the image received from the source device 500, and if it determines that the image does not match its own EDID, it actively changes the original EDID, generates a modified EDID with a structure that the source device 500 can parse, and has the source device 500 read it, thereby receiving and outputting an image that matches its own EDID. Furthermore, the display device 100 keeps the display screen in a mute state until it receives an image based on the modified EDID, so that the display device 100 can prevent the user from noticing the process of receiving more images due to its own EDID modification operation, thereby minimizing user inconvenience due to the EDID modification operation.

[0040] FIG. 2 shows an example EDID structure.

[0041] EDID is a standardized means for a display device to communicate its display capability information to a source device, via which the display device can communicate its operating characteristics, such as base resolution and recommended resolution, to an associated source device, allowing the source device to generate the content format required to meet the display device's needs.

[0042] In order to incorporate information according to the enhancement of high resolution / high frequency specifications of a display device, the EDID may be structured in a scalable form by one or more data blocks. For example, the EDID may be structured in a basic EDID block and one or more extended EDID blocks. Referring to FIG. 2, the EDID 200 may be structured in four blocks, namely, a basic EDID block 210, a first extended EDID block 220, a second extended EDID block 230, and a third extended EDID block 240. The first block, the basic EDID block, is a mandatory block, and may have a version of, for example, EDID 1.3 or higher. The basic EDID block may also be referred to as a VESA (Video Electronics Standards Association) block. The second block, the first extended EDID block 220, may indicate an extended block or a block map. For example, if the EDID is composed of a total of two blocks, the first extended EDID block will be an extended block, and if the EDID is composed of three or more blocks, the first extended EDID block may indicate a block map that contains information related to the extended blocks.

[0043] The basic EDID block 210 also includes a header 211 consisting of a fixed pattern that identifies it as an EDID file; display product identification information 212; EDID version information 213; basic display parameters 214 that define characteristics such as whether the display device receives analog or digital input, synchronization type, maximum horizontal and vertical size of the display, gamma transfer characteristics, power management capabilities, color space, and basic video timing; color characteristics 215 that define the RGB color space conversion technique used by the display device; detailed timing information 216 of the resolution supported by the display device; extension flags 217 that indicate the number of additional extension blocks available; and a checksum 218.

[0044] The timing information 216 may include, for example, a supported set timing 216-1, a manufacturer reserved timing 216-2, a supported EDID standard timing 216-3, a first detailed timing descriptor block 216-4, a second detailed timing descriptor block 216-5, a third detailed timing descriptor block 216-6, and a fourth detailed timing descriptor block 216-7, among which the first detailed timing descriptor block 216-4 is also set as a preferred timing mode as a video timing mode that allows a display manufacturer to generate the best quality on the display screen.

[0045] The pixel clock included in the detailed timing descriptor block of the basic EDID block can express up to 655.35 MHz, and the horizontal addressable pixel is set to express up to 4095 pixels. Therefore, if the pixel clock of the input signal exceeds 655.35 MHz, or if the display device is a high-resolution / high-frequency display device whose horizontal screen resolution size is greater than 4095 pixels, the pixel clock or panel size exceeds the expression range that can be recorded in the existing basic EDID block 210, so accurate display resolution information cannot be included in the existing two-block EDID. That is, in such a case, it is impossible to record high-resolution / high-frequency information in the basic EDID block, and an additional extended block may be required. Therefore, the display device must use, for example, an extended EDID block to record high-resolution / high-frequency information, which results in a situation where an HDMI port using the EDID 1.3 version uses a 4-block EDID, and a DisplayPort port using the EDID 1.4 version uses a 3-block EDID.

[0046] FIG. 3 illustrates, by way of example, an example of a third extended EDID block.

[0047] 3, the third extended EDID block 240 also includes DisplayID version and revision information 241, a display type identifier 242, a first data block 243 including a detailed timing descriptor, a second data block 244 including a detailed timing descriptor, a third data block 245 including a detailed timing descriptor, and a checksum 246. One or more of the data blocks included in the third extended EDID block 240 may be set as recommended timing information.

[0048] According to one embodiment, in an EDID structure including a basic EDID block and a third extended EDID block, the priority of timing information may be determined in the following order: recommended timing modes of the basic EDID, detailed timing modes of the basic EDID, and additional detailed timing modes defined in the extended block.

[0049] FIG. 4 shows a 2-block EDID, a 3-block EDID and a 4-block EDID according to an example.

[0050] Referring to FIG. 4, the two-block EDID 410 is composed of a basic EDID block (VESA block) and a Consumer Electronics Association (CEA) extension block (CEA-861) defined to support advanced functions of consumer devices including HDMI (registered trademark), and many AV source devices on the market are designed with such a two-block EDID in mind.

[0051] The three-block EDID 420 is used in a DisplayPort port that uses the EDID 1.4 version, and includes a VESA block as a basic EDID block, and also includes a CEA block and a DisplayID block as EDID extension blocks.

[0052] The four-block structure EDID 430 is used in an HDMI (registered trademark) port that uses EDID 1.3 version, and includes a VESA block as a basic EDID block, and also includes a Map block, a CEA block, and a DisplayID block as EDID extension blocks.

[0053] Many source devices, particularly AV devices, can parse the 2-block EDID 410, but are highly likely to fail to parse the 3-block EDID 420 or the 4-block EDID 430.

[0054] In this way, when using the DisplayID extension block for high resolution / high frequency support, some AV devices on the market may not properly parse the DisplayID block or the Map block, and may output a low resolution signal or a DVI signal that is an RGB signal without audio. For example, in the HDMI (registered trademark) standard, if EDID parsing fails, a low resolution signal of SD class, for example, a video signal of 480p or 576p in RGB format, is to be output. 480p may indicate a resolution with 480 vertical scan lines, for example, 640*480p, 720*480p, 800*480p, etc. 576p may indicate a resolution with 576 vertical scan lines, for example, 768*576p, 1024*576p, etc. Therefore, when a display device uses an EDID in which a DisplayID block or a Map block includes an extension block, some AV source devices may fail to analyze the EDID and output low-resolution content that is not the resolution that the display device has set as a recommendation (preferred). Some display devices provide a user menu for allowing a user to manually change the EDID setting when such a problem occurs, but such a method is inconvenient for the user because the user must directly operate the display device to solve the problem. Therefore, in the disclosed embodiment, the display device automatically determines the problem situation before the user of the display device faces a related problem, and if an EDID change is required, performs the EDID change operation, thereby preventing a malfunction of the source device in advance. The EDID automatic change operation performed by the display device is performed in a state in which the display screen of the display device is muted, so that the user only feels a slight screen delay phenomenon, and the source device can provide and output content with an appropriate resolution with little impact on the user.

[0055] FIG. 5 is an example block diagram of a display device and a source device, according to one embodiment.

[0056] Referring to FIG. 5, the source device 500 includes a transmission unit 510, a video processing unit 520, and a control unit 530.

[0057] The transmitting unit 510 can output a video signal having a resolution that can be processed by the display apparatus 100 and an audio signal having a sound format that can be processed by the display apparatus 100. In addition, the transmitting unit 510 can read EDID including display characteristic information including information related to a supportable resolution or sound format from the display apparatus 100.

[0058] The transmission unit 510 may include one or more ports for communication with the display device 100. For example, the one or more ports may include ports of various standards such as an HDMI (registered trademark) port, a DisplayPort (DP), Thunderbolt, a mobile high-definition link (MHL), and a universal serial bus (USB).

[0059] The image processor 520 can process the image transmitted through the transmitter 510 under the control of the controller 530 .

[0060] The control unit 530 controls the overall operation of the source device 500, controls it to process video and audio signals to be transmitted to the display device 100, and controls the processed video and audio signals to be output through the input / output interface 410.

[0061] According to an embodiment, the control unit 530 may read an EDID including display characteristic information from the display device 100 and control the image processing unit 420 to process an image based on the read EDID.

[0062] According to an embodiment, the control unit 530 may read EDID from the display device 100 by connecting the source device 500 and the display device 100, control the image processing unit 520 to process an image based on the read EDID, and control the image processing unit 520 to transmit the processed image signal to the display device 100 via the transmission unit 510. In this case, if the control unit 530 fails to parse the read EDID and fails to obtain the display characteristic information included in the EDID, the control unit 530 may control the control unit 530 to output a low-resolution image designated as a default or to output an image signal without an audio signal.

[0063] When a control signal is received from display device 100 to read further EDID in response to such a low-resolution video output or a video signal output without an audio signal, control unit 530 can control video processing unit 520 to read further EDID from display device 100 and process the video based on the read EDID, and can control the processed video signal to be transmitted to display device 100 via transmission unit 510.

[0064] Now, the display device 100 will be described.

[0065] The display device 100 can process and output video and audio signals received from the source device 500 .

[0066] The display device 100 also includes a receiving unit 110, a video processing unit 120, a display 130, an audio processing unit 140, an audio output unit 150, a power supply unit 160, a memory 170, an EDID memory 180, and a control unit 190.

[0067] The receiving unit 110 may receive a video signal and an audio signal from the source device 500 according to a connected protocol under the control of the control unit 190, and output the received video signal and audio signal to the video processing unit 120 and the audio processing unit 140.

[0068] The image processor 120 can process the image signal received from the receiver 110 under the control of the controller 190 and output the processed image signal to the display 130 .

[0069] The display 130 can display the video signal received from the video processor 120 on a screen.

[0070] Under the control of the control unit 190 , the audio processing unit 140 can convert the audio signal received from the receiving unit 110 into an analog audio signal and output it to the audio output unit 150 .

[0071] The audio output unit 150 can output the received analog audio signal via a speaker.

[0072] The memory 160 can store programs related to the operation of the display device 100 and various data generated during the operation of the display device 100 .

[0073] The EDID storage unit 170 is a memory that stores EDID, and can store EDID data including display characteristic information such as a manufacturer / product identifier, an EDID format version, display parameters (supported resolution, color format, etc.), and an audio format. The EDID can be stored in the EDID storage unit 140 by a manufacturer during the production process of the display device 100. A flash memory can be used as the EDID storage unit 170.

[0074] The EDID storage unit 170 corresponds to one or more ports included in the receiving unit 110 of the display device 100, and can store EDID corresponding to each port. For example, if the receiving unit 110 has an HDMI port and a DisplayPort, the EDID storage unit 170 also includes an EDID used for the HDMI and an EDID used for the DisplayPort.

[0075] According to an embodiment, the control unit 190 may record the EDID stored in the EDID storage unit 170 in the EDID memory 180 so that the EDID can be read by the source device 500. The EDID memory 180 from which the source device 500 can read the EDID may be implemented by an electrically erasable programmable read-only memory (EEPROM).

[0076] According to an embodiment, in order to improve EDID compatibility, the controller 190 may modify the EDID stored in the EDID storage unit 170, rather than recording the EDID directly in the EDID memory 180, and may record the modified EDID in the EDID memory 180. In order to distinguish from such modified EDID, the EDID stored during the manufacturing process of the display device 100 is referred to as an EDID or an original EDID, and the EDID modified and generated by the controller 190 for EDID compatibility is also referred to as a modified EDID.

[0077] According to an embodiment, the control unit 190 can modify the original EDID whenever necessary to improve EDID compatibility, and store the modified EDID in the EDID memory 180.

[0078] According to an embodiment, when the display device 100 is manufactured, a plurality of EDIDs may be stored in the EDID storage unit 170. That is, the plurality of EDIDs may initially include an original EDID including display characteristic information for optimally implementing the performance of the display device 100, and one or more modified EDIDs including display characteristic information modified for EDID compatibility. If a plurality of EDIDs are stored in the EDID storage unit 170, the control unit 190 may select an EDID suitable for a situation and record it in the EDID memory 180 without changing the EDID during the operation of the display device 100, thereby reducing the burden on the control unit 190. For example, in a normal operation of the display device 100, the control unit 190 may record the original EDID stored in the EDID storage unit 170 in the EDID memory 180, and in a specific situation, the control unit 190 may record the modified EDID stored in the EDID storage unit 170 in the EDID memory 180. An example of such a specific situation is when the source device 500 is unable to parse the original EDID of the display device 100 .

[0079] The control unit 190 controls the overall operation of the display device 100, processes digital video and audio signals transmitted from the source device 500, displays them on the display 130, and controls them to be output through the audio output unit 150.

[0080] According to an embodiment, the control unit 160 may detect attribute information from an image received from the source device 500, and may change the EDID if the detected attribute information does not match the EDID provided by the display device 100. The fact that the attribute information detected from the image does not match the EDID provided by the display device 100 may indicate that the attribute information of the image received from the actual source device does not match the display performance of the display device 100. For example, if the display device 100 provides an EDID including display characteristic information indicating that it can display an image of HD class or UHD class or higher, but the image received from the source device 400 indicates an SD class, the display device 100 may determine that the source device 500 has a problem parsing its own EDID. Therefore, in such a case, the display device 100 may change its own EDID to an EDID in a form that the source device 500 can parse.

[0081] According to an embodiment, the control unit 190 may detect attribute information from an image received from the source device 500 and determine whether the detected attribute information matches the EDID provided by the display device 100. According to an example, the control unit 190 may detect a resolution as attribute information of an image received from the source device 500 and determine whether the detected resolution matches the EDID provided by the control unit 190 itself. For example, if the resolution of an image received from the source device 500 is equal to or lower than the SD class (e.g., 480p, 576p), the control unit 190 may determine whether the resolution corresponds to display characteristic information specified in the EDID of the control unit 190 itself. If the resolution of the image is SD class, the source device 500 may fail to parse the EDID of the display device 100 because the resolution of the image is a default low-resolution format that the source device can process. Therefore, when the display device 100 receives an SD class image, the display device 100 may suspect that the source device 500 has failed to parse the EDID. For example, if the resolution of the received image is SD class and its EDID is 3 blocks or 4 blocks, the controller 190 may determine that the received image does not match its EDID. For example, if the resolution of the received image is SD class and its EDID is 2 blocks, the controller 190 may determine that the received image matches its EDID.

[0082] The transmitting unit 150 of the source device 500 and the receiving unit 110 of the display device 100 may be connected via one or more cables. A communication process when the transmitting unit 510 and the receiving unit 110 are connected via an HDMI cable will be described with reference to FIG.

[0083] Referring to FIG. 5, the HDMI cable 300 also includes a TMDS (transition minimized differential signaling) line 310 for transmitting video and audio signals, a DDC line 320 for transmitting EDID data, a 5V power line 330 for providing a 5V voltage from the source device 500 to the display device 100, and an HPD (hot plug detect) line 340 for performing EDID reading control.

[0084] The operation of the case where the source device 500 and the display device 100 are connected by such an HDMI cable will be described below. First, when the source device 500 and the display device 100 are connected by an HDMI cable, the transmission unit 510 of the source device 500 can provide a 5V voltage to the reception unit 110 of the display device 100 through the 5V power line 330. The reception unit 110 of the display device provided with the 5V voltage can transmit a signal having a high level voltage to the transmission unit 510 of the source device 500 through the HPD line 340. The transmission unit 510 of the source device 500 that receives the signal having a high level voltage through the HPD line 340 transmits an EDID request signal through the DDC line 320, and the reception unit 110 of the display device 100 that receives the EDID request signal can provide the EDID of the display device 100 to the transmission unit 510 of the source device 500. The control unit 530 of the source device 500 that receives the EDID of the display device 100 may parse the EDID to acquire display characteristic information, and may control content processing based on the acquired display characteristic information. The transmission unit 510 of the source device 500 may transmit the processed video signal and audio signal to the receiving unit 110 of the display device 100 via the TMDS line 310.

[0085] The source device 500 determines whether the voltage level of the HPD signal is a high level that is equal to or higher than a predetermined voltage level, and if the voltage level is high, the source device 500 can read EDID data from the display device 100 by an I2C (Inter-IC bus) protocol. Thus, the display device 100 can control the source device 500 to read its own EDID through the control of the HPD line 340. Specifically, when an EDID change operation is requested, the display device 100 can prevent the source device 500 from reading an EDID signal by maintaining the HPD line 340 at a low level while the display device 100 changes the EDID, and when the EDID change is completed, the display device 100 can control the source device 500 to read the changed EDID by setting the HPD line 340 to a high level.

[0086] According to one embodiment, the display device 100 performs an EDID change operation when the resolution of the image received from the source device 500 does not match its own EDID. At this time, while performing the EDID change operation, the display device 100 keeps the HPD line 340 at a low level to prevent the source device 500 from reading the EDID signal. Once the EDID change is completed, the display device 100 can control the source device 500 to read the changed EDID by setting the HPD line 340 to a high level.

[0087] According to an embodiment, the display device 100 may restore the changed EDID to the original EDID if a specific event is detected. Restoring the changed EDID to the original EDID may mean replacing the changed EDID stored in the EDID memory 180 read by the source device 500 with the original EDID. The specific event may include an event indicating the end of the connection with the source device. The specific event may include, for example, detection of cable removal, reception of a power-off input of the display device, or entry into a power management system of the display device. For example, if the resolution of the image received from the source device 500 does not match its own EDID, in a situation in which the display device 100 has performed an EDID change operation, when the connection with the source device 500 is terminated, the display device 100 does not need to maintain the changed EDID for the connection with the source device 500, so it is preferable to restore the EDID stored in the EDID memory 180 to the original EDID.

[0088] FIG. 6 illustrates an example flowchart of a method of operating a display device, according to one embodiment.

[0089] 6, in operation 610, the display device 100 may receive an input image from the source device 500. In operation 610, the input image received by the display device 100 from the source device 500 is also an image resulting from the source device 500 reading the EDID of the display device 100 and processing the format of the image based on the display characteristic information included in the read EDID.

[0090] In operation 620, the display device 100 may detect attributes of the received input image. The attributes of the input image detected by the display device 100 may include one or more attributes included in the display characteristic information defined in the EDID. For example, the display device 100 may detect resolution information of the input image as an attribute of the input image.

[0091] At operation 630, display device 100 may determine whether the detected attributes correspond to the EDID of the display device, i.e., whether source device 400 correctly parsed the EDID of display device 100 and provided video in a processed format based on the display characteristic information defined in the EDID.

[0092] According to an embodiment, the display apparatus 100 may determine whether the resolution of the received input image corresponds to the resolution defined in the EDID. For example, the display apparatus 100 may determine whether the received input image corresponds to the recommended timing information defined in the EDID, thereby determining whether the received input image corresponds to the EDID of the display apparatus.

[0093] According to an embodiment, when the resolution of the received input image is equal to or less than the SD class, e.g., 480p or 576p, and the EDID of the display device 100 has a structure of 3 blocks or more, the display device 100 may determine that the resolution of the received input image does not match the EDID. Although the EDID of the display device 100 having a structure of 3 blocks or more indicates that the resolution provided by the display device 100 provides a resolution at least much higher than the SD class, the fact that the source device 400 sent the SD class image may indicate that the source device 500 failed to correctly parse the EDID of the display device 100. Therefore, it may be determined that the input image sent by the source device 500 that has failed to parse the EDID does not match the EDID provided by the display device 100.

[0094] In operation 630, if it is determined that the attributes of the input image received from the source device 500 match the EDID of the display device 100, the display device 100 may proceed to operation 660. For example, if the resolution of the input image indicates an SD class and the EDID of the display device 100 has a two-block structure, the display device 100 may determine that the attributes of the received input image match the EDID of the display device 100.

[0095] In operation 660, the display apparatus 100 may terminate the mute state of the display screen and control the input image received from the source apparatus 500 to be displayed on the screen. Specifically, when the sink of the signal of the input image received from the source apparatus 500 is stabilized and becomes outputtable, the display apparatus 100 may terminate the mute state of the display screen and control the input image to be displayed on the screen.

[0096] In operation 630, if it is determined that the attributes of the input image received from the source device 500 do not match the EDID of the display device 100, the display device 100 may proceed to operation 640. For example, if the resolution of the input image indicates an SD class and the EDID of the display device 100 has a structure of three or more blocks, the display device 100 may determine that the resolution of the received input image does not match the EDID of the display device 100.

[0097] In operation 640, the display device 100 can change the EDID. That is, in operation 630, if the display device 100 receives an input image from the source device 500 that does not match its own EDID, it is highly likely that the source device 500 has failed to correctly parse the EDID provided by the display device 100 itself. Therefore, the display device 100 changes the format of the EDID so that the source device 500 can parse it, and further provides it to the source device 400.

[0098] According to an embodiment, the display device 100 can change an EDID composed of a plurality of blocks to an EDID composed of a predetermined number of blocks. The plurality of EDID blocks constituting the EDID can be composed of one basic EDID block and one or more EDID extension blocks, but the display device 100 can change the EDID composed of the predetermined number of blocks by leaving the basic EIDD block and one EDID extension block and removing the other EDID extension blocks.

[0099] According to an embodiment, the display device 100 can change an EDID having a structure of three or more blocks to an EDID having a two-block structure. For example, the display device 100 can change an EDID having a structure of three or more blocks to an EDID having a two-block structure by leaving only a basic EDID block and one extended EDID block in the EDID having a structure of three or more blocks and removing the remaining extended EDID blocks.

[0100] According to one embodiment, when the display device 100 changes an EDID consisting of multiple blocks to an EDID consisting of a predetermined number of blocks, the contents of the EIDD blocks that are not removed and are maintained may remain unchanged.

[0101] According to an embodiment, when changing an EDID configured with a plurality of blocks to an EDID configured with a predetermined number of blocks, the display device 100 may modify the contents of EDID blocks that are not removed and are maintained. For example, the display device 100 may modify and record the recommended timing information included in the basic EIDD block.

[0102] According to one embodiment, the display device 100 prepares EDIDs for various combinations and configurations in advance, and when an EDID change is required, it can select one of the EDIDs for the various combinations and configurations and store the selected EDID in an EDID memory that can be read by the source device 500.

[0103] At operation 650, the display device 100 may receive an input video from a source device based on the modified EDID.

[0104] Specifically, after completing the EDID change, the display device 100 controls the source device 500 to read the changed EDID, and can receive an image formatted based on the changed EDID from the source device 500.

[0105] In operation 660, the display apparatus 100 may end screen muting and control to output the received image if the sink of the formatted image is stabilized based on the modified EDID received from the source apparatus 500. In this manner, if it is determined that the image received by the display apparatus 100 from the source apparatus 500 does not match the EDID of the display apparatus 100, the display apparatus 100 may change the EDID so that the source apparatus 500 can parse it, and provide it to the source apparatus 500, so that the display apparatus 100 may receive and output a higher quality image from the source apparatus 500. Furthermore, such an operation for improving EDID compatibility is automatically performed within the display apparatus 100 without the user's involvement, and therefore a service may be provided without an operation operation that causes inconvenience to the user. By providing the modified EDID once more between the source device 500 and the display device 100, it may take some time for the display device 100 to receive video in a format based on the last modified EDID. However, the additional time required is not so long as to burden the user, and therefore the problem due to EDID compatibility can be resolved without the need for manual operation by the user.

[0106] FIG. 7 is a flowchart illustrating a specific operation of a source device and a display device connected via an HDMI cable according to an embodiment.

[0107] 7, the source device 500 and the display device 100 may be connected via an HDMI cable in operation 700. Specifically, the transmission unit 510 of the source device 500 and the reception unit 110 of the display device 100 may be connected via an HDMI cable.

[0108] In operation 705 , if the source device 500 and the display device 100 are connected via an HDMI® cable, the source device 500 can send a 5 volt voltage to the display device 100 via the 5V power line 330 .

[0109] In operation 710, the display device 100 receiving 5 volts from the source device 500 via the 5V power line 330 can transmit a high level signal via the HPD line 340. When the HPD line 340 is in a high level state, the source device 500 can perform an operation of reading EDID from the display device 100.

[0110] In operation 715 , the source device 500 that receives the high level signal on the HPD line 340 can transmit an EDID request signal to the display device 100 via the DDC line 320 .

[0111] In operation 720, the display device 100 that has received the EDID request signal may transmit an EDID response signal including EDID information of the display device to the source device 500 via the DDC line 320. Specifically, when there is an EDID request from the source device 500, the display device 100 may transmit an EDID response including the EDID stored in the EDID memory 180 to the source device 500.

[0112] In operation 725, the source device 500 that has received the EDID from the display device 100 may generate an image in a format according to the display characteristic information defined in the EDID based on the received EDID. Specifically, the source device 500 may acquire the display characteristic information defined in the EDID by parsing the EDID received from the display device 100. Then, the source device 500 may process and generate an image in a format that can be displayed by the display device 100 according to the acquired display characteristic information.

[0113] Since the EDID has an extensible structure, it may be composed of two or more EDID blocks. Depending on the parsing performance of the source device 500, the source device 500 may fail to parse the EDID received from the display device 100. For example, if the EDID has three blocks, the source device 500 can parse an EDID composed of two blocks, but has difficulty parsing an EDID composed of three or more blocks. For example, the source device 500 has difficulty parsing a DisplayID block or a Map block other than the VESA block and the CEA block, which are basic EDID blocks. For example, the source device 400 has difficulty parsing the first byte information of each extension block. Due to such various reasons, the source device 500 may fail to parse an EDID composed of three or more blocks. If the EDID parsing fails, the source device 500 may process the video in a default low-resolution format or generate a DVI signal without an audio signal as a default. If the source device 500 fails to parse the EDID, the lower resolution format available for processing the video may be 480p or even 576p.

[0114] As such, if the EDID parsing is successful, source device 500 may generate video in a format based on the display characteristic information defined in the EDID, at operation 725. If source device 500 fails to parse the EDID, source device 500 may process video in a default lower resolution, i.e., SD class format, or generate a DVI signal without an audio signal.

[0115] In operation 730, the source device 500 can transmit the generated video to the display device 100 via the TMDS line 310. If the source device 500 successfully parses the EDID of the display device 100, the display device 100 will receive video in a format that matches its EDID; if the source device 500 fails to parse the EDID of the display device 100, the display device 100 will receive a lower resolution video rather than a format that matches its EDID.

[0116] In operation 735, the display device 100 can detect the resolution of the input image received from the source device 400. The display device 100 can detect the resolution information of the input image from the HDMI status information transmitted together with the input image received from the source device 500. The HDMI status information includes a video format field indicating a current video format used at the HDMI terminal, and the video format field also includes information such as the number of vertical lines, the number of horizontal lines, the scan rate, and the screen ratio associated with the video format on the HDMI link. The display device 100 can detect the resolution of the input image based on the content of such a video format field.

[0117] At operation 740, display device 100 may determine whether the detected resolution matches the EDID.

[0118] According to an embodiment, the display apparatus 100 may determine whether the detected resolution corresponds to a resolution defined in the EDID. That is, the display apparatus 100 may determine that the detected resolution matches if it has a value of a resolution level defined in the EDID. However, the display apparatus 100 may determine that the detected resolution does not match if it does not have a value of a resolution level defined in the EDID. For example, when the detected resolution is a low resolution, i.e., 480p or 576p, and the EDID has a structure of three or more blocks, the display apparatus 100 may determine that the detected resolution does not match the EDID. For example, when the detected resolution is a low resolution, i.e., 480p or 576p, and the EDID has a structure of two blocks, the display apparatus 100 may determine that the detected resolution matches the EDID and may determine to output the input image as is.

[0119] If it is determined that the detected resolution matches the resolution defined in the EDID, the display apparatus 100 proceeds to operation 775, where the display apparatus 100 may terminate the display screen mute state and output the input image. For example, if the detected resolution of the input image is low resolution, and if the display apparatus 100's EDID has a two-block structure, it is unlikely that the source apparatus 500 has a problem parsing the EDID, and the display apparatus 100 may output the received input image as is. For example, even if the display apparatus 100's original EDID has a three or more block structure, the display apparatus 100 may intentionally change the EDID to a two-block structure in a specific situation. For example, in a situation where the display apparatus 100 receives an image to be output on a PIP (picture in picture) screen from the source apparatus 500, the PIP screen is a relatively small screen, and therefore it is sufficient to output a low-resolution image. In that case, the display apparatus 100 may intentionally change the EDID of its own having a three or more block structure to a two-block structure and store it in the EDID memory. In such a situation, even if the display device 100 receives a low-resolution image from the source device 500, it can decide to output the received image as is because the EDID stored in its EDID memory matches the two-block structure.

[0120] If the display device 100 determines that the detected resolution does not match the resolution defined in the EDID, it may proceed to operation 745.

[0121] In operation 745, the display device 100 can transmit a high-level signal through the HPD line 340. The display device 100 can control the source device 500 to read the EDID using the status signal transmitted through the HPD line. When the display device 100 first receives a 5V voltage from the source device 500, the display device 100 can transmit a high-level signal through the HPD line 340. Thereafter, during operation of the display device 100, the display device 100 can transmit a high-level signal to the HPD line to allow the EDID to be read, or transmit a low-level signal to prevent the EDID from being read. In operation 750, the display device 100 can transmit a low-level signal through the HPD line 340 to prevent the source device 500 from reading the EDID during an operation of changing the EDID.

[0122] In operation 750, the display device 100 may perform an operation of changing the EDID. According to an embodiment, when the detected resolution is a low resolution, i.e., 480p or 576p, if the EDID has a structure of three or more blocks, the display device 100 may change the EDID having a structure of three or more blocks to an EDID having a two-block structure. The EDID changing operation will be described in detail with reference to FIGS. 8 to 18.

[0123] In operation 755, the display device 100 modifies the EDID and, once the operation of recording the modified EDID in the EDID memory 180 is completed, the display device 100 can transmit a high level signal to the source device 500 via the HPD line 340 to cause the source device 500 to further read the modified EDID recorded in the EDID memory 180.

[0124] In operation 760 , the source device 500 that receives the high level signal on the HPD line 340 can transmit an EDID request signal to the display device 100 via the DDC line 320 .

[0125] In operation 765, the display device 100 that has received the EDID request signal may transmit an EDID response signal including the modified EDID stored in the EDID memory 180 to the source device 500 via the DDC line 320.

[0126] At operation 770, the source device 500 that has received the EDID response signal containing the modified EDID can generate an image based on the modified EDID by parsing the modified EDID and processing the image format according to the display characteristic information contained in the parsed EDID.

[0127] At operation 775, source device 500 may transmit video based on the modified EDID to display device 100 via TMDS line 310.

[0128] In operation 780, the display device 100 receives the video based on the changed EDID, and if the signal synchronization is stabilized, it can end the screen mute and output the video.

[0129] The image based on the changed EDID may still be a low resolution image such as 480p. However, in this case, since the display device 100 has already stored an EDID having a two-block structure in the EDID memory 180, the display device 100 may determine that the received image matches the EDID when it confirms that the EDID stored in the EDID memory 180 has a two-block structure. Therefore, in this case, as long as the signal is muted, the screen mute state can be ended and the image can be output.

[0130] FIG. 8 shows an example of the structure of an EDID stored in the display device 100 according to one embodiment.

[0131] 8, according to an example, the display apparatus 100 may include an HDMI port and a display port in the receiving unit 110. The EDID storage unit 170 may store an EDID 171 corresponding to the HDMI port and an EDID 172 corresponding to the display port. The EDID 171 corresponding to the HDMI port may include a basic EDID block, a first extended EDID block, a second extended EDID block, and a third extended EDID block. The EDID 172 corresponding to the display port may include a basic EDID block, a first extended EDID block, and a second extended EDID block. The EDID stored in the EDID storage unit 170 may be stored when the display apparatus 100 is manufactured.

[0132] When the display apparatus 100 is shipped and operated, the control unit 190 may record the EDID stored in the EDID storage unit 170 in the EDID memory 180. Basically, in a normal operation state, the control unit 190 records the EDID stored in the EDID storage unit 170, i.e., the EDID indicating a state in which the display apparatus 100 can optimally display content, in the EDID memory 180 as is, so that the source device 500 can read the EDID including optimal display characteristic information. Therefore, in FIG. 8, the EDID stored in the EDID storage unit 170 is recorded in the EDID memory 180 as is, and includes an EDID 181 corresponding to the HDMI port and an EDID 182 corresponding to the display port.

[0133] When there is a request from the source device 500 , the receiver 110 may transmit a response including the EDID stored in the EDID memory 180 to the source device 500 under the control of the controller 190 .

[0134] FIG. 9 is a reference diagram for explaining an example in which an EDID having a structure of three or more blocks is changed to an EDID having a structure of two blocks according to an embodiment.

[0135] 9, the display device 100 can generate an EDID 910 having a two-block structure composed of a VESA block and a CEA block by deleting the DisplayID block from a three-block EDID 420 corresponding to a DisplayPort port using EDID 1.4 version. Also, the display device 100 can generate an EDID 920 having a two-block structure composed of a VESA block and a CEA block by deleting the Map block and the DisplayID block from a four-block EDID 430 corresponding to an HDMI port using EDID 1.3 version. In this way, changing the EDID block to a two-block structure allows the source device to perform EDID parsing.

[0136] FIG. 10 illustrates an example of changing a 4-block EDID corresponding to an HDMI port using EDID 1.3 version to a 2-block EDID according to one embodiment.

[0137] Referring to FIG. 10, according to one embodiment, the display device 100 can generate a 2-block EDID by deleting the first extended EDID block (Map block) and the third extended EDID block (DisplayID block) from a 4-block EDID corresponding to an HDMI (registered trademark) port using EDID 1.3 version, and maintaining the existing EDID block (VESA block) and the second extended EDID block (CEA block).

[0138] At this time, of the last two bytes constituting the VESA block, one byte indicates an extension flag 1010 and the other byte indicates a checksum 1020 .

[0139] The extension flag 1010 indicates the number of extension blocks contained in the EDID. Before the EDID is changed, there are three extension blocks: a Map block, a CEA block, and a DisplayID block, so the value of the extension flag 1010 is 03. However, by deleting two extension blocks, namely the Map block and the DisplayID block, from the EDID, the number of extension blocks becomes one, so after the EDID is changed, the value of the extension flag 1030 for the VESA block can be displayed as 01.

[0140] Checksum 1040 may be modified to reflect the changed value by changing the value of extension flags 1010 from 03 to 01.

[0141] FIG. 11 illustrates another example of changing a 4-block EDID corresponding to an HDMI port using EDID 1.3 version to a 2-block EDID according to one embodiment.

[0142] In the example shown in FIG. 10, a two-block EDID is generated by deleting two extension blocks from an EDID consisting of only four blocks, whereas in the example shown in FIG. 11, not only is the four-block EDID changed to an EDID consisting of two blocks, but the contents of the VESA blocks can also be further modified.

[0143] When the display device 100 changes the EDID by deleting a DisplayID block in this way, it is preferable to modify the existing VESA block. Specifically, the display device 100 can modify the original VESA block by considering the recommended resolution information 1110 recorded in the VESA block and the recommended resolution information 1120 recorded in the DisplayID block to be deleted, determining final recommended resolution information 1130, and recording the final recommended resolution information 1130 in the VESA block.

[0144] FIG. 12 illustrates an example of a specific method for changing an original EDID into a modified EDID according to an embodiment.

[0145] 12, the original EDID 1210 also includes a basic EDID block 1211, a first extended EDID block 1212, a second extended EDID block 1213, and a third extended EDID block 1214. The basic EDID block 1211 also includes a detailed timing descriptor block 1 that defines timing #1, a detailed timing descriptor block 2 that defines timing #2, a detailed timing descriptor block 3 that defines timing #3, and a detailed timing descriptor block 4 that defines timing #4. The third extended EDID block 1214 also includes a detailed timing descriptor block 1 that defines timing #5, a detailed timing descriptor block 2 that defines timing #6, a detailed timing descriptor block 3 that defines timing #7, and a detailed timing descriptor block 4 that defines timing #8.

[0146] According to an embodiment, the display device 100 may remove the first extended EDID block 1212 and the third extended EDID block 1214, and generate a modified EDID 1220 based on the basic EDID block 1211 and the second extended EDID block 1213. In this case, for the basic EDID block 1211 and the second extended EDID block 1213 included in the modified EDID 1220, the display device 100 may use the contents of the basic EDID block 1211 and the second extended EDID block 1213 included in the original EDID 1210 without modification.

[0147] For example, if the display device 100 supports a monitor with a 32:9 format, the recommended resolution information of the basic EDID block 1211 of the original EDID 1210 may include 3840x1080@60hz. This may indicate a resolution within a range that can be recorded in the VESA block for the resolution of the 32:9 format. The recommended timing information of the third extended EDID block 1214 may include one of 5120x1440@60hz, 5120x1440@120hz, and 5120x1440@240hz. This is to reflect the resolution of a panel that supports the 32:9 format and indicate an optimal resolution. In such an example, if the display device 100 uses the content of the basic EDID block 1211 without modification to generate the modified EDID 1220, the basic EDID block 1211 of the modified EDID 1220 may include the recommended resolution information of 3840x1080@60hz. In this way, if the original EDID with a four-block structure is generated by using the modified EDID with a two-block structure, the source device 500 can generate an image with a suitable format according to the parsing content by successfully parsing the modified EDID with a two-block structure. For example, if the source device 500 is an AV device that supports the 16:9 format, the source device 500 can process the image in the 16:9 format and provide it to the display device since the recommended resolution information included in the modified EDID parsed by the source device 500 itself is 32:9 but the source device 500 itself can support 16:9. In this case, even if the display device 100 cannot receive the image in the 32:9 format that it can support, it can receive an image with higher quality than the low-resolution image of SD class that the source device 400 previously received due to the failure of EDID parsing.

[0148] The second extended EDID block 1213 also includes one or more pieces of timing information. By allowing the source device 500 to parse the modified EDID, the source device 400 can not only refer to the recommended timing information included in the basic EDID block 1211, but also refer to the one or more pieces of timing information included in the second extended EDID block 1213 and use them to process the video format.

[0149] FIG. 13 illustrates another example of a method for changing an original EDID into a modified EDID according to one embodiment.

[0150] 13, according to an embodiment, the display apparatus 100 may remove the first extended EDID block 1212 and the third extended EDID block 1214, and generate a modified EDID 1220 based on the basic EDID block 1211 and the second extended EDID block 1213. In this case, the display apparatus 100 may modify the contents of at least one of the basic EDID block 1211 and the second extended EDID block 1213 included in the original EDID 1210 for the basic EDID block 1211 and the second extended EDID block 1213 included in the modified EDID 1220.

[0151] According to an embodiment, the display device 100 can change the recommended timing information of the basic EDID block 1211 included in the changed EDID. For example, taking into consideration that the source device 500 is a version of a device that cannot parse the previous original EDID, the display device 100 can change the recommended timing information of the basic EDID block 1211. For example, assuming that the source device 500 is an AV device that cannot parse the original EDID that it previously sent, the display device 100 can change the recommended timing information of the original EDID block 1211 based on the resolution information of the format supported by the AV device.

[0152] According to an embodiment, the display device 100 can change one or more pieces of timing information included in the second extended EDID block 1213 included in the changed EDID. For example, considering that the source device 500 is a version of a device that cannot parse the previous original EDID, the display device 100 can change one or more pieces of timing information in the second extended EDID block 1213. For example, assuming that the source device 500 is an AV device that cannot parse the original EDID that it previously sent, the display device 100 can change one or more pieces of timing information in the second extended EDID block 1212 based on the resolution information of the format supported by the AV device.

[0153] FIG. 14 illustrates a specific example of a method for changing an original EDID to a modified EDID according to one embodiment.

[0154] Referring to FIG. 14, if the display device 100 supports a 32:9 format monitor, the recommended resolution information of the basic EDID block 1211 of the original EDID 1210 includes 3840x1080@60hz, and the recommended timing information of the third extended EDID block 1214 also includes 5120x1440@60 / 120 / 240hz.

[0155] If the source device 500 cannot parse such original EDID and sends a low-resolution image to the display device 100, the display device 100 may determine that the source device 100 is an AV device that supports the 16:9 format. The display device 100 may change the 4-block EDID to a 2-block EDID so that an AV device that supports the 16:9 format can parse it, and may change the recommended resolution information included in the basic EDID block to timing information corresponding to the 16:9 format. By changing the timing information to the 16:9 format in this way, the source device 500 may obtain timing information more suitable for its own format from its own modified EDID.

[0156] According to an embodiment, the display apparatus 100 may change the recommended timing information of the basic EDID block included in the modified EDID to resolution information corresponding to the 16:9 format. For example, the display apparatus 100 may change the recommended timing information of the basic EDID block to UHD resolution (3840x2160@hz) or FHD resolution (1920x1080@60hz) according to the 16:9 format. Referring to FIG. 14, the modified EDID 1410 indicates that the recommended timing information of the basic EDID block has been changed to UHD resolution (3840x2160@hz), and the modified EDID 1420 indicates that the recommended timing information of the basic EDID block has been changed to FHD resolution (1920x1080@60hz).

[0157] According to an embodiment, when the display apparatus 100 changes the recommended timing information of the basic EDID block included in the modified EDID to resolution information corresponding to the 16:9 format, the display apparatus 100 may selectively select and change the recommended timing information to one of UHD resolution (3840x2160@hz) or FHD resolution (1920x1080@60hz). However, if there is no problem in the display apparatus 100 performing the downscaling process, it is more preferable that the display apparatus 100 changes the recommended timing information of the basic EDID block included in the modified EDID to resolution information corresponding to the 16:9 format to UHD resolution (3840x2160@hz) rather than FHD resolution (1920x1080@60hz). This is because, in general, when the display apparatus 100 receives an image from the source apparatus 400, it receives a high-resolution image rather than a low-resolution image, and if scaling adjustment is required, performing the downscaling process can obtain a higher quality image.

[0158] The display device 100 can record the modified EDID in a memory that can be accessed and read by the source device 500. The display device 100 can change and use the EDID whenever an event occurs that requires the EDID to be changed, or can initially store the modified EDID together with the original EDID, and select and use the stored modified EDID when the modified EDID must be used.

[0159] FIG. 15 illustrates an example of a method for generating and recording a modified EDID, according to one embodiment.

[0160] Referring to FIG. 15, the control unit 160 can read the EDID stored in the EDID storage unit 170, i.e., the original EDID, modify it in the manner described above to generate a modified EDID, and store the modified EDID 1500 in the EDID memory 180 that the source device 500 can access and read.

[0161] FIG. 16 illustrates another example of a method for generating and recording a modified EDID, according to one embodiment.

[0162] 16, the display apparatus 100 may store a plurality of EDIDs in the EDID storage unit 170. When the display apparatus 100 needs to change the EDID, the display apparatus 100 may select an appropriate EDID from the plurality of EDIDs stored in the EDID storage unit 170 and store the selected EDID in the EDID memory 180. For example, the display apparatus 100 may store in the EDID storage unit 170 both an original EDID 1610 having a four-block structure and a modified EDID 1620 having a two-block structure, which are compatible with an HDMI port.

[0163] Initially, the display device 100 stores an EDID 1610 having a four-block structure in the EDID memory 180. If the number of EDID blocks needs to be changed to two later due to reception of a low-resolution image from the source device 500, the control unit 190 can select an EDID 1620 consisting of two blocks from the EDID storage unit 170 and record the selected changed EDID 1620 in the EDID memory 180.

[0164] FIG. 17 is a flow chart illustrating an example of a method process for restoring a changed EDID in an electronic device to an original EDID, according to one embodiment.

[0165] 17, in operation 1710, the electronic device 100 may detect an event that is pre-specified for EDID restoration. EDID restoration refers to restoring the modified EDID generated by the above-described operation to the original EDID. That is, the EDID is stored in a memory that the source device 500 can access and read, and when the electronic device 100 changes the EDID, the modified EDID is stored in an EDID memory that the source device 500 can access and read, and restoring the EDID may refer to further storing the original EDID in a memory that the source device 500 can access and read.

[0166] The events already specified to trigger an EDID restoration operation may also be events that indicate a situation in which the electronic device 100 is no longer able to continue receiving content from the source device 500 coupled to the electronic device 100 .

[0167] According to an embodiment, the pre-specified event for EDID restoration may include an event of detecting removal of a cable connecting the source device 500 to the electronic device 100. For example, the display device 100 may include a detector for detecting cable removal, and may detect removal of the cable through such a detector. In this manner, if removal of the cable connecting the source device 500 to the display device 100 is detected, it may be predicted that the connection relationship with the source device 500 will end and that content reception from the source device 500 will end, and therefore it may be determined not to maintain the modified EDID any more and to restore to the original EDID.

[0168] According to an embodiment, the pre-specified event for EDID restoration also includes an event of receiving a power-off input of the display device 100. For example, when a user performs a power-off input to terminate the operation of the display device 100, the display device 100 may determine that the connection relationship with the currently connected source device 500 is also terminated, and may determine not to maintain the changed EDID any more, but to restore the original EDID.

[0169] According to an embodiment, the pre-specified event for EDID restoration may include an event indicating the display device 100 entering a display power management system. For example, the display device 100 may operate a display power management system that cuts off power supply to the display when a certain condition for power management is satisfied, thereby saving power of the display device 100. For example, the display device 100 may enter a display power management mode and cut off power supply to the display when there is no user input for a certain period of time. In this manner, when an event indicating entry into the display power management system is detected, the display device 100 may determine that the connection relationship with the currently connected source device 500 is also terminated, and may determine to no longer maintain the changed EDID and to restore to the original EDID.

[0170] In operation 1720, the electronic device 100 may restore the original EDID by detecting the event for EDID restoration. Restoring the original EDID may mean recording the original EDID instead of the modified EDID in a memory that is accessed and read by the source device 500. For example, in the examples illustrated in Fig. 15 and Fig. 16, the control unit 190 may restore the original EDID by deleting the HDMI (registered trademark) port-related modified EDID 1500 or 1620 from the EDID memory 180 and recording the HDMI (registered trademark) port-related original EDID 1610.

[0171] FIG. 18 illustrates an example scenario of modifying and further restoring the original EDID according to one embodiment.

[0172] Referring to FIG. 18, a source device 500 supporting a 16:9 resolution and a display device 100 supporting a 32:9 resolution may be connected via an HDMI cable.

[0173] Through the HDMI cable connection, the source device 500 can read the original EDID consisting of four blocks from the display device 100. Since the display device 100 supports 32:9 resolution, the original EDID can be recorded in timing information recommended for 32:9 resolution.

[0174] However, the source device 500, as an AV device, may fail to parse the 4-block EDID. In this case, the source device 500 may process the video in a low-resolution format and output it to the display device 100 due to the parsing failure.

[0175] The display apparatus 100 that receives the low-resolution image can change the 4-block EDID to a 2-block EDID, and can correct the 16:9 resolution to the recommended timing information in the changed EDID.

[0176] The source device 500 further receives the EDID modified to the two-block structure from the display device, and in this case, by successfully parsing the two-block EDID, the source device 500 can process the video format at a higher resolution than the lower resolution. Also, the source device 500 can process the video format by referring to the 16:9 resolution as the recommended resolution information included in the modified EDID.

[0177] The display device 100 can receive and output a higher resolution image format from the source device 500. Thereafter, when the display device 100 detects an event indicating that the connection with the source device 500 is terminated, the display device 100 can restore the modified EDID having the two-block structure to the original EDID having the four-block structure.

[0178] Some embodiments may be embodied in the form of a recording medium including computer executable instructions, such as a program module executed by a computer. A computer readable medium is any available medium that can be accessed by a computer, including both volatile and non-volatile media, and both separate and non-separate media. A computer readable medium also includes a computer recording medium. The computer recording medium includes both volatile and non-volatile, separate and non-separate media embodied in any method or technology for storing information, such as computer readable instructions, data structures, program modules, or other data.

[0179] The disclosed embodiments may be embodied by a software program including instructions stored on a computer-readable storage medium.

[0180] The computer is a device that can call up instructions stored in a recording medium and operate according to the disclosed embodiments in accordance with the called instructions, and also includes an electronic device according to the disclosed embodiments.

[0181] The computer-readable recording medium may be provided in the form of a non-transitory recording medium. Here, "non-transitory" only means that the recording medium is tangible without including a signal, and does not distinguish between data being stored semi-permanently or temporarily in the recording medium.

[0182] Furthermore, the control method according to the disclosed embodiment may be provided in a computer program product, which may be traded as a commodity between a seller and a buyer.

[0183] The computer program product may also include a S / W program and a computer-readable recording medium on which the S / W program is stored. For example, the computer program product may also include a product in the form of a S / W program (e.g., a downloadable application) that is electronically distributed through a device manufacturer or an online market (e.g., Google Play Store, App Store). For electronic distribution, at least a part of the S / W program may be stored in a recording medium or temporarily generated. In this case, the recording medium may be a recording medium of a manufacturer's server, an online market server, or an intermediate server that temporarily stores the SW program.

[0184] The computer program product may include a recording medium of the server or a recording medium of the device in a system consisting of a server and a device. Alternatively, if there is a third device (e.g., a smartphone) that is communicatively connected to the server or device, the computer program product may include a recording medium of the third device. Alternatively, the computer program product may include the S / W program itself that is transmitted from the server to the device or the third device, or transmitted from the third device to the device.

[0185] In this case, one of the server, the device, and the third apparatus may execute the computer program product to perform the method according to the disclosed embodiment, or two or more of the server, the device, and the third apparatus may execute the computer program product to perform the method according to the disclosed embodiment in a distributed manner.

[0186] For example, a server (e.g., a cloud server or an artificial intelligence server, etc.) may execute a computer program product stored on the server and control devices communicatively coupled to the server to perform methods according to the disclosed embodiments.

[0187] In another example, a third device may execute the computer program product and control a device communicatively coupled to the third device to perform the method according to the disclosed embodiment. When the third device executes the computer program product, the third device may download the computer program product from a server and execute the downloaded computer program product. Alternatively, the third device may execute a computer program product provided in a preloaded state and perform the method according to the disclosed embodiment.

[0188] In this specification, a "unit" may be a hardware component such as a processor or a circuit, and / or a software component executed by a hardware component such as a processor.

[0189] The above description of the present disclosure is for illustrative purposes only, and a person having ordinary skill in the art to which the present disclosure pertains can easily understand that the present disclosure can be easily modified into other specific forms without changing the technical idea or essential features of the present disclosure. Therefore, the above-described embodiments should be understood to be illustrative and not limiting in all respects. For example, each component described as a single type may also be implemented in a distributed form, and similarly, each component described as distributed may also be implemented in a combined form.

[0190] The scope of the present disclosure is indicated by the claims rather than the above detailed description, and all modifications and variations that fall within the meaning, scope, and equivalent concepts of the claims should be construed as being included within the scope of the present disclosure. [Explanation of symbols]

[0191] 100 Display device 110 Receiving unit 120 Video Processing Unit 130 Display 140 Audio Processing Unit 150 Audio output section 160 Memory 170 EDID storage section 180 EDID memory 190 Control section 200 Source Device 210 Basic EDID Block 211 Header 212 Display Product Identification Information 213 EDID version information 214 Basic Display Parameters 215 Color Characteristics 216 Timing Information 216-1 Setting timing 216-2 Manufacturer reservation timing 216-3 EDID standard timing 216-4 First detailed timing descriptor block 216-5 Second detailed timing descriptor block 216-6 Third Detailed Timing Descriptor Block 216-7 Fourth Detailed Timing Descriptor Block 217 Extended Flags 218 Checksum 220 1st Extended EDID Block 230 Second Extended EDID Block 240 3rd Extended EDID Block 241 Revision Information 242 Display Type Identifier 243 First Data Block 244 Second Data Block 245 3rd Data Block 246 Checksum 300 HDMI (registered trademark) cable 310 TMDS Line 320 DDC lines 330 5V Power Line 340 HPD Line 500 Source Devices 510 Transmission Unit 520 Video Processing Unit 530 Control Unit 610 operation 620 operation 630 operation 640 operation 650 operation 660 operation 700 operations 705 operation 710 operation 715 operation 720 operation 725 operation 730 operation 735 operation 740 operation 745 operation 750 operation 755 operation 760 operation 765 operation 770 operation 775 operation 780 operation 1010 Extended Flags 1020 Checksum 1110 Recommended resolution information 1120 Recommended resolution information 1130 Recommended resolution information 1210 Original EDID Block 1211 Basic EDID Block 1212 1st Extended EDID Block 1212 2nd Extended EDID Block 1213 Second Extended EDID Block 1214 3rd Extended EDID Block 1220 Change EDID 1410 Change EDID 1420 Change EDID 1710 operation 1720 operation

Claims

1. In an electronic device, a receiver configured to receive information including an input video from a source device; a memory for storing one or more instructions; a processor for executing one or more instructions stored in the memory; The processor executes the one or more instructions to: detecting a first resolution of the input image received from the source device; determining whether to change the EDID according to whether the detected first resolution corresponds to at least one supported resolution associated with an EDID of the electronic device; Changing the EDID by determining to change the EDID; receiving an input video from the source device having a second resolution generated based on the modified EDID; The electronic device modifies the EDID by changing the number of data blocks constituting the EDID to a predetermined number.

2. The processor executes the one or more instructions to: If it is determined that the detected first resolution does not correspond to at least one supported resolution associated with the EDID, then determining to change the EDID; 2. The electronic device of claim 1, further comprising: if it is determined that the detected first resolution corresponds to at least one supported resolution associated with the EDID, the received input image of the first resolution is output to a display without changing the EDID.

3. The EDID is composed of a basic EDID block and one or more extended EDID blocks, The processor executes the one or more instructions to: The electronic device according to claim 1 , wherein the number of data blocks constituting the EDID is changed to the predetermined number by removing the one or more extended EDID blocks from among the data blocks constituting the EDID.

4. The processor executes the one or more instructions to: The electronic device of claim 3 , further comprising: a step of: generating an updated basic EDID block by removing the one or more extended EDID blocks and changing the first recommended resolution information recorded in the basic EDID block to a second recommended resolution information;

5. The electronic device of claim 4 , wherein a value of an information field indicating the number of extended EDID blocks included in the updated basic EDID block is changed by removing the one or more extended EDID blocks.

6. The processor executes the one or more instructions to: providing a status signal to the source device to control the source device to read the changed EDID upon completion of the change of the EDID; 2. The electronic device of claim 1, further comprising: receiving an EDID request from the source device, providing the modified EDID to the source device, and receiving the input image of the second resolution generated based on the modified EDID from the source device.

7. The processor executes the one or more instructions to: The electronic device of claim 1 , further comprising: a display screen muting state is released by receiving the input video of the second resolution from the source device, and the received input video of the second resolution is displayed on the display.

8. The processor executes the one or more instructions to: The electronic device of claim 1 , wherein the electronic device is configured to restore the modified EDID to an original EDID by detecting a predefined event.

9. The predetermined event is: The electronic device of claim 8 , comprising at least one of: removing a cable connecting the source device to the electronic device, entering a power management mode state, or inputting a power off.

10. The input image of the first resolution received from the source device is 2. The electronic device of claim 1, wherein the source device that read the EDID generated the video by processing the video at the first resolution, which was set to a default due to failure to parse the EDID.

11. The processor executes the one or more instructions to: determining not to change the EDID because the detected first resolution corresponds to at least one supported resolution associated with the EDID; The electronic device of claim 1 , further comprising: canceling a display screen mute state and displaying the received input video of the first resolution on a display.

12. The electronic device of claim 1 , wherein the first resolution represents a lower resolution including at least one of 480p and 576p, and the second resolution is higher than the first resolution.

13. 1. A method of operating an electronic device, comprising: detecting a first resolution of an input image received from a source device; determining whether to change an extended display identification data (EDID) of the electronic device depending on whether the detected first resolution corresponds to at least one supported resolution associated with the EDID; changing the EDID by determining to change the EDID; receiving an input image from the source device having a second resolution generated based on the modified EDID; A method for operating an electronic device, the method comprising: changing the number of data blocks constituting the EDID to a predetermined number, thereby changing the EDID.

14. A non-transitory computer-readable recording medium having recorded thereon one or more programs to be executed by a processor of an electronic device to realize an operating method of an electronic device, the operating method of the electronic device comprising: detecting a first resolution of an input image received from a source device; determining whether to change an extended display identification data (EDID) of the electronic device depending on whether the detected first resolution corresponds to at least one supported resolution associated with the EDID; changing the EDID by determining to change the EDID; receiving an input image from the source device having a second resolution generated based on the modified EDID; A computer-readable recording medium for changing the number of data blocks constituting the EDID to a predetermined number, thereby changing the EDID.

15. At least one supported resolution associated with the EDID is a first recommended resolution; The processor executes the one or more instructions to: The electronic device of claim 1 , further comprising: determining to modify the EDID of the electronic device due to the detected first resolution not corresponding to the first recommended resolution.

16. The processor executes the one or more instructions to: The electronic device of claim 15 , further comprising: changing the EDID by changing the first recommended resolution to a second recommended resolution.

17. The EDID is composed of a basic EDID block and one or more extended EDID blocks, The processor executes the one or more instructions to: The electronic device according to claim 16 , wherein the number of data blocks constituting the EDID is changed to a predetermined number by removing the one or more extended EDID blocks from among the data blocks constituting the EDID.

18. The processor executes the one or more instructions to: The electronic device of claim 17 , further comprising: generating an updated basic EDID block by changing first recommended resolution information recorded in the basic EDID block to second recommended resolution information.

19. At least one supported resolution associated with the EDID is a first recommended resolution; The method of operation includes: The method of claim 13 , further comprising the act of determining to modify the EDID of the electronic device due to the first detected resolution not corresponding to the first recommended resolution.

20. The method of claim 19 further comprising the act of modifying the EDID by changing the first recommended resolution to a second recommended resolution.

21. The EDID is composed of a basic EDID block and one or more extended EDID blocks, The method of operation includes: The method of claim 20, further comprising changing the number of data blocks constituting the EDID to a predetermined number by removing the one or more extended EDID blocks from among the data blocks constituting the EDID.

22. The method of claim 21 , further comprising: generating an updated basic EDID block by changing first recommended resolution information recorded in the basic EDID block to second recommended resolution information.

23. At least one supported resolution associated with the EDID is a first recommended resolution; The method for operating the electronic device includes:

15. The computer readable medium of claim 14, further comprising an act of determining to modify the EDID of the electronic device due to the detected first resolution not corresponding to the first recommended resolution.

Images