CN116721614B - EDID information acquisition device, liquid crystal display screen detection device and method - Google Patents

EDID information acquisition device, liquid crystal display screen detection device and method Download PDF

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Publication number
CN116721614B
CN116721614B CN202310702931.5A CN202310702931A CN116721614B CN 116721614 B CN116721614 B CN 116721614B CN 202310702931 A CN202310702931 A CN 202310702931A CN 116721614 B CN116721614 B CN 116721614B
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edid
module
liquid crystal
crystal display
information
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CN116721614A (en
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曹捷
吴兴宇
黎力行
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Gowin Semiconductor Corp
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Gowin Semiconductor Corp
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The application discloses an EDID information acquisition device and a liquid crystal display screen detection method, wherein the EDID information acquisition device is realized based on an FPGA, at least one EDID information with corresponding resolution is stored in the EDID information acquisition device, and the EDID information corresponding to the resolution of a liquid crystal display to be detected is updated through an upper computer, so that the EDID information can be conveniently and rapidly increased or updated. Therefore, when the resolution is required to be changed, the EDID information corresponding to the resolution of the liquid crystal display to be detected is simply, quickly and conveniently switched to the EDID information corresponding to the resolution to be changed only by updating and determining the EDID information corresponding to the resolution of the liquid crystal display to be detected through the upper computer, and the detection efficiency of the liquid crystal display is improved.

Description

EDID information acquisition device, liquid crystal display screen detection device and method
Technical Field
The present application relates to, but not limited to, electronic detection technology, and in particular, to an EDID information acquisition device, a liquid crystal display detection device and a method.
Background
Along with the wide use of liquid crystal display in application scenes such as mobile phones, flat panels, displays, televisions and the like, the resolution of the liquid crystal display is also increasing. In general, before a lcd is shipped, in order to check whether the lcd has defects such as bright spots, dark spots, and dead spots, test software is used to generate solid colors, geometric shapes, scenery images of figures, alternate images, and the like to detect the lcd. When the resolution of the test chart is the same as that of the liquid crystal display screen, the pixel points are in one-to-one correspondence, and a good detection effect can be achieved.
In general, it is most convenient to output various test charts through a computer. For liquid crystal display screens with different resolutions, different extended display identification data (EDID, extended Display Identification Data) information can be set, and after the EDID information is read by a computer, a test chart with the corresponding resolution is output, so that a good detection effect is ensured to be achieved. In this case, if the liquid crystal display having a plurality of resolutions is to be detected, the EDID information needs to be updated frequently. EDID is a standard for identifying data for a liquid crystal display established by the video electronics standards association (VESA, video Electronics Standards Association) organization in establishing a liquid crystal display data channel communication protocol. The EDID information includes parameters related to the liquid crystal display and its performance, such as vendor information, maximum image size, color setting, limitation of frequency range, etc.
In order to improve the detection efficiency of the liquid crystal display, how to update the EDID information quickly and conveniently becomes a problem to be solved.
Disclosure of Invention
The application provides an EDID information acquisition device, a liquid crystal display screen detection device and a liquid crystal display screen detection method, which can rapidly and conveniently switch EDID information so as to improve the detection efficiency of a liquid crystal display screen.
The embodiment of the invention provides an EDID information acquisition device, which is realized based on a Field Programmable Gate Array (FPGA), and comprises: the device comprises a storage module, a read control module, an interface processing module and a write control module; wherein,
The storage module is used for storing more than one Extended Display Identification Data (EDID) files, and each EDID file comprises EDID information of liquid crystal display screens with different resolutions; receiving a write enabling signal, write address information and a write data signal from the write control module, and writing corresponding data into an address corresponding to the write address information in the storage module;
the interface processing module is used for receiving a detection request from equipment for detecting the liquid crystal display and analyzing the detection request to obtain a read command and read address information; converting the EDID file from the read control module into a signal supported by the interface processing module and outputting the signal to the device for detecting the liquid crystal display;
The read control module is used for receiving a read command and read address information from the interface processing module, converting the read command into a read enabling signal of the storage module, taking the read address information as address information for reading the storage module, reading an EDID file corresponding to the address information from the storage module, and outputting the read EDID file to the interface processing module;
and the write control module is used for receiving signals for writing the EDID information from the upper computer and converting the signals for writing the EDID information into write enable signals, write address information and write data signals.
In an exemplary embodiment, the selection module is further configured to: outputting the EDID file serial number of the EDID file where the resolution of the liquid crystal display to be detected corresponds to the EDID information to an external display device and displaying the EDID file serial number.
In one illustrative example, the memory module is a static random access memory, SRAM; the read control module is an SRAM read control module; the write control module is an SRAM write control module.
In one illustrative example, the interface processing module is an I 2 C slave module.
The embodiment of the application also provides a liquid crystal display screen detection device, which comprises: a decoding and liquid crystal driving section and the EDID information obtaining apparatus according to any one of claims 1 to 4; the decoding and liquid crystal driving part comprises an input and selection module and a screen driving module;
The input and selection module is used for decoding the image from the video input interface; detecting the format of the decoded data, comparing and judging the decoded data with the read EDID time sequence information, and outputting an image with correct format and resolution corresponding to the read EDID information to the screen driving module as a test image;
The screen driving module is used for receiving time sequence parameter information of an image corresponding to the EDID information written by the upper computer through the UART serial port from the EDID information acquisition device, generating a text image layer according to the time sequence parameter information of the image, superposing the text image layer on a test image, and outputting a liquid crystal display screen for display through the video output interface.
In one illustrative example, the screen driving module further includes a switch by which whether to display the text layer on the test image is selected.
In an exemplary embodiment, the input and selection module includes one or any combination of DVI decoding, HDMI decoding, DP decoding, and a built-in test chart, format-matching detection and selection module; wherein,
The DVI decoding, the HDMI decoding and the DP decoding are respectively used for decoding the DVI, HDMI, DP video input interface input signals;
the built-in test chart is used for generating a test image according to the EDID time sequence information;
The format matching detection and selection module is used for detecting the format of the decoded data, comparing and judging the decoded data with the EDID time sequence information and outputting a test image.
In one illustrative example, the input and selection module further includes a gating module;
The gating module receives the selection signal from the format matching detection and selection module and selects and outputs a test image with a correct format; and if no signal or incorrect format exists, selecting valid test image output according to the selection signal.
In an exemplary embodiment, the screen driving module includes a parameter layer generating module, an image superimposing module, and one or any combination of LVDS driving, MIPI driving, and eDP driving; wherein,
The parameter layer generating module is used for receiving the time sequence parameter information of the image analyzed by the UART receiving and analyzing module in the EDID storing and switching module and generating a character layer according to the time sequence parameter information of the image;
The image superposition module is used for superposing the test image and the text image layer, and outputting the test image and the text image layer to the liquid crystal display screen through the video output interface after the test image and the text image layer are respectively driven by the LVDS drive, the MIPI drive and the eDP drive.
The embodiment of the application also provides a liquid crystal display screen detection method which is applied to a liquid crystal display screen detection device realized based on the FPGA, and comprises the following steps:
Selecting corresponding EDID information from more than one stored EDID information according to the resolution of the liquid crystal display to be detected currently, wherein the more than one stored EDID information is written in by an upper computer through a UART serial port;
Reading the selected EDID information according to the detection request, so that the detection equipment outputs an image with resolution corresponding to the read EDID information;
And outputting the obtained image to a liquid crystal display screen to be detected so as to realize the detection of the liquid crystal display screen to be detected.
In an exemplary embodiment, the method further includes: and displaying the EDID file serial number corresponding to the currently selected EDID information.
In an exemplary embodiment, the method further includes: according to the update request, new EDID information is additionally stored.
In an exemplary embodiment, the method further includes:
analyzing time sequence parameter information of an image from an EDID file corresponding to the EDID information;
And generating a text image layer according to the time sequence parameter information of the image, and outputting the test image and the text image layer to the liquid crystal display screen to be detected after the test image and the text image layer are overlapped.
The embodiment of the application also provides a computer readable storage medium, which stores computer executable instructions for executing the liquid crystal display screen detection method according to any one of the above.
The embodiment of the application further provides a computer device, which comprises a memory and a processor, wherein the memory stores the following instructions executable by the processor: a step for executing the liquid crystal display screen detection method of any one of the above.
The EDID information acquisition device provided by the embodiment of the application is realized based on the FPGA, at least one EDID information with corresponding resolution is stored in the EDID information, and the EDID information corresponding to the resolution of the liquid crystal display to be detected is updated through the upper computer, so that the EDID information can be conveniently and rapidly increased or updated. Therefore, when the resolution is required to be changed, the EDID information corresponding to the resolution of the liquid crystal display to be detected is simply, quickly and conveniently switched to the EDID information corresponding to the resolution to be changed only by updating and determining the EDID information corresponding to the resolution of the liquid crystal display to be detected through the upper computer, and the detection efficiency of the liquid crystal display is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
FIG. 1 is a schematic diagram of a testing platform for LCD display in related art;
fig. 2 is a schematic diagram of a composition structure of an EDID information obtaining apparatus according to an embodiment of the application;
Fig. 3 is a schematic diagram illustrating the composition and structure of an embodiment of an EDID information obtaining apparatus according to an embodiment of the application;
FIG. 4 is a schematic diagram of an SRAM read control module in an embodiment of the present application;
FIG. 5 is a schematic diagram of an I 2 C slave module according to an embodiment of the present application;
FIG. 6 is a schematic diagram of an SRAM write control module in an embodiment of the present application;
FIG. 7 is a schematic diagram of a testing platform for LCD panel according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a structure of a detecting device for a liquid crystal display according to an embodiment of the present application;
Fig. 9 is a flow chart of a method for detecting a liquid crystal display according to an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
Generally, the structure of the lcd test platform is shown in fig. 1, and the lcd test platform includes a computer (PC), a display test board, and an lcd. As shown in fig. 1, a PC may be connected to a display screen test board through a video input interface, after EDID information in EDID storage is read through an I 2 C bus, an image with resolution corresponding to the read EDID information is input to the display screen test board through the video input interface, and after passing through a video decoding chip and a liquid crystal driving chip, the display screen test board outputs received image data to various liquid crystal display screens through a video output interface, so as to implement detection of the liquid crystal display screens. The video input interface may include, for example, a digital video interface (DVI, digital Visual Interface) interface, a high-definition multimedia interface (HDMI, high Definition Multimedia Interface) interface, or a display interface (DP, displayPort). The video output interface may include, for example, a Low Voltage Differential Signaling (LVDS) interface, a mobile industry processor interface alliance (MIPI, mobile Industry Processor Interface) interface, or an embedded display interface (eDP, embedded DisplayPort), etc.
Among them, EDID information is generally stored in two storage modes, one is stored in an Electrically Erasable Programmable Read Only Memory (EEPROM) device, and the other is stored in a video decoding chip. In the case of storing EDID information in an EEPROM device, a professional burner tool is required to burn the EDID information into the EEPROM device, and only one piece of EDID information is usually stored in the EEPROM device, that is, when the resolution needs to be changed, the EDID information needs to be burned again. In the case of the EDID information stored in the video decoding chip, since the video decoding chip generally provides an I2C or SPI interface to configure the chip, the EDID information is generally written into the video decoding chip by the MCU chip using the I2C or SPI interface, and similarly, when the resolution needs to be changed, the EDID information needs to be rewritten. As can be seen from the test scheme of the lcd provided by the related art, when a plurality of lcd panels with different resolutions need to be tested, frequent operation and repeated update are faced. And for the display screen with different interfaces, different display screen test boards need to be replaced.
In the related art, when testing display screens with different resolutions and different interfaces, multiple EDID files cannot be supported, and a special burner or other devices are required to burn through a program, so that the method is relatively complex and the cost is increased. In addition, the decoding chip and the driving chip often support a single interface at present, and the video test board needs to be replaced continuously aiming at display screens with different interfaces. In addition, the time sequence parameters of the display screen can not be intuitively seen during the test of the display screen.
In order to update the EDID information rapidly and conveniently, be compatible with the display test of various interfaces and improve the detection efficiency of a liquid crystal display, the embodiment of the application provides an EDID information acquisition device based on a Field Programmable Gate Array (FPGA) and realized by Field-Programmable GATE ARRAY.
Fig. 2 is a schematic diagram of a composition structure of an EDID information obtaining apparatus according to an embodiment of the present application, where, as shown in fig. 2, the EDID information obtaining apparatus is implemented based on an FPGA, and at least includes: the device comprises a storage module, a read control module, an interface processing module and a write control module; wherein,
The storage module is used for storing more than one EDID file, and each EDID file comprises EDID information of liquid crystal display screens with different resolutions; receiving a write enabling signal, write address information and a write data signal from a write control module, and writing corresponding data into an address corresponding to the write address information in a storage module;
The interface processing module is used for receiving a detection request from equipment for detecting the liquid crystal display and analyzing the received detection request to obtain a read command and read address information; the EDID file from the read control module is converted into a signal supported by the interface processing module and is output to equipment for detecting the liquid crystal display;
The read control module is used for receiving the read command and the read address information from the interface processing module, converting the read command into a read enabling signal of the storage module, taking the read address information as the address information of the read storage module, reading an EDID file corresponding to the address information from the storage module, and outputting the read EDID file to the interface processing module;
and the write control module is used for receiving signals for writing the EDID information from the upper computer and converting the signals for writing the EDID information into write enable signals, write address information and write data signals.
According to the EDID information acquisition device provided by the embodiment of the application, the EDID information of at least one corresponding resolution is stored in the FPGA-based device, and the EDID information corresponding to the resolution of the liquid crystal display to be detected is updated through the upper computer, so that when the resolution needs to be changed, the EDID information corresponding to the resolution of the liquid crystal display to be detected can be simply, quickly and conveniently switched to the EDID information corresponding to the resolution needing to be changed only through updating of the upper computer, and the detection efficiency of the liquid crystal display is improved.
The EDID information acquisition device in the embodiment of the application is realized based on the FPGA, can store various EDID files, does not need a special burner or other devices to burn through a program, is convenient and simple to use, and reduces the cost. In the embodiment of the application, the new EDID file is written into the EDID information acquisition device provided by the embodiment of the application on line in real time through the writing control module, so that the addition or update of the EDID information is conveniently and rapidly realized. Especially, in the case that all the EDID file information stored in the storage module is not matched with the resolution of the liquid crystal display screen to be detected, the EDID information is conveniently increased through the writing control module.
In an exemplary embodiment, for the case that the EDID file information stored in the storage module is not matched with the resolution of the liquid crystal display to be detected, the method may also be implemented by modifying the FPGA design, that is: and adding a new EDID file by replacing the initialization file of the storage module, compiling and then downloading the new EDID file into the FPGA.
In one illustrative example, as shown in fig. 3, the memory module may include, but is not limited to, a static random access memory (SRAM, static Random Access Memory) module, for example.
In one embodiment, as shown in connection with fig. 3 and 2, the SRAM module, upon receiving the read enable and read address signals from the read control module, returns corresponding read data to the read control module. In one embodiment, the SRAM module, upon receiving a write enable, write address, and write data signal from the write control module output, writes corresponding data to the corresponding address of the SRAM module.
In one illustrative example, as shown in FIG. 3, the read control module may include, but is not limited to, an SRAM read control module.
In one embodiment, as shown in fig. 3 and fig. 2, the SRAM read control module receives a detection request output from the interface processing module, including a read command and read address information, converts the read command into a read enable signal of the SRAM, and uses the read address information as an address signal in the SRAM module, so that a corresponding EDID file can be read from the SRAM module. In one embodiment, as shown in fig. 4, taking the SRAM module storing the EDID file as an example, the 8-bit address from the selection module is shown as the read address addr [7:0] in fig. 4, and the address signal is shown as the read address rd_addr [7:0] in fig. 4.
In one illustrative example, the interface processing module may include, but is not limited to, an I 2 C slave module. As shown in fig. 5, the I 2 C interface is a standard interface, including two signal lines, a pass clock (SCL) and Serial Data (SDA). In one embodiment, the I 2 C slave module, upon receiving the I 2 C signal from the PC for reading the EDID information, parses the I 2 C signal to obtain a read command, 8 bits of read address information such as the read address addr [7:0] in FIG. 5, and converts 8 bits of data read from the memory module such as the read data [7:0] in FIG. 5 into I 2 C signals for output.
In one illustrative example, as shown in FIG. 3, the write control module may include, but is not limited to, an SRAM write control module.
In one embodiment, as shown in fig. 3 and fig. 2, the SRAM write control module receives a universal asynchronous receiver/transmitter (UART) serial port signal from the host computer, generates a write enable signal, a write address and a write data signal of the SRAM after conversion, and outputs the write enable signal, the write address and the write data signal to the memory module, so as to write corresponding data to an address corresponding to the write address information in the memory module. In one embodiment, as shown in fig. 6, the UART interface is a standard serial port, and includes two signal lines, UART transmit (UART TX) and UART receive (UART RX). Here, taking the storage of the EDID file in the SRAM module as an example, when the host computer needs to write the data of the EDID file into the SRAM module through the serial port, the SRAM write enable signal, the 8-bit address signal, such as wr_addr [7:0] in fig. 6, and the wr_data [7:0] in fig. 6, are generated by parsing.
Fig. 7 is a schematic diagram of a composition architecture of a liquid crystal display test platform according to an embodiment of the present application, as shown in fig. 7, where EDID on a liquid crystal display test board in the liquid crystal display test platform according to an embodiment of the present application is stored as the FPGA-based EDID information obtaining apparatus according to any one of the present application. In connection with the illustration of fig. 3, when the FPGA design is implemented, for example, a DVI, HDMI and/or DP decoding module is integrated to implement different video input interfaces, and a screen driving module such as LVDS, MIPI and/or eDP is integrated to implement different video output interfaces. And storing an EDID file in an initialization file of the SRAM module, wherein the EDID file comprises EDID information of liquid crystal display screens to be detected with different resolutions. And downloading the FPGA downloading file generated by compiling into the FPGA after the FPGA is designed. The method comprises the steps that a liquid crystal display is required to be detected, a PC is connected to a liquid crystal display test board, EDID information is obtained by reading an EDID file, then an image with corresponding resolution is output according to the EDID information, and the image is output to the liquid crystal display through the liquid crystal display test board to be displayed so as to detect the liquid crystal display through observing the displayed content. If the liquid crystal display screens with different resolutions are replaced, the replaced liquid crystal display screens can be detected only by writing the EDID file corresponding to the new resolution into the UART according to the resolution of the new liquid crystal display screens. As shown in fig. 7, by integrating a plurality of decoding and driving modules, support for different interfaces is ensured, and the test board of the liquid crystal display screen is not required to be continuously replaced for the liquid crystal display screen of different interfaces.
In an exemplary embodiment, in the lcd test platform provided by the embodiment of the present application, EDID storage may be implemented by an SRAM module, and may be updated by an upper computer through UART serial ports. Thus, after the PC is connected to the liquid crystal display test board, the PC reads the EDID file and outputs an image with corresponding resolution according to the EDID information, and then the displayed content can be observed on the liquid crystal display. If the liquid crystal display screen is replaced, the upper computer only needs to write the corresponding EDID file into the SRAM memory through the UART serial port according to the resolution ratio of the new liquid crystal display screen, and the replaced liquid crystal display screen can be tested by utilizing the corresponding EDID file.
Fig. 8 is a schematic diagram of a composition structure of a liquid crystal display detection device according to an embodiment of the present application, where, as shown in fig. 8, the liquid crystal display detection device is implemented based on an FPGA, and at least includes: the decoding and liquid crystal driving part and any one of the EDID information acquiring apparatuses provided in the embodiments of the present application, wherein the decoding and liquid crystal driving part may include an input and selection module S1 and a screen driving module S2; the EDID information obtaining means may include an EDID storing and switching module S3.
An input and selection module S1 for decoding the image from the video input interface; detecting the format of the decoded data, comparing and judging the decoded data with the read EDID time sequence information, and outputting an image with correct format and resolution corresponding to the read EDID information to a screen driving module S2 as a test image;
The screen driving module S2 is configured to receive timing parameter information of an image corresponding to EDID information written by the upper computer through the UART serial port from the EDID storing and switching module S3, where the timing parameter information of the image may be as shown in table 1. And generating a text image layer according to the time sequence parameter information of the image, superposing the text image layer on the test image, and finally outputting a liquid crystal display screen for display through a video output interface. In one embodiment, a switch may be used to select whether to display a text layer on the test image.
The EDID storing and switching module S3 stores more than one EDID file, each EDID file including EDID information of liquid crystal display screens with different resolutions.
In an illustrative example, the input and selection module S1 may include one or any combination of DVI decoding S11, HDMI decoding S12, DP decoding S13, and a built-in test chart S14, a format matching detection and selection module S15. The input and selection module S1 may further include a gating module S16. In one embodiment, DVI decoding S11, HDMI decoding S12, DP decoding S13 are used to implement decoding of DVI, HDMI, DP video input interface input signals, respectively. The built-in test chart S14 is used for generating test images such as red, green and blue grids according to the EDID timing information. The format matching detection and selection module S15 is configured to perform format detection on the decoded data, compare and determine the decoded data with the EDID timing information, send a selection signal to the gating module S16, and output a test image with a correct format, and if there is no signal or the format is incorrect, select a valid test image according to the selection signal.
In an illustrative example, the screen driving module S2 may include a parameter layer generating module S21, an image superimposing module S22, and one or any combination of an LVDS driver S23, an MIPI driver S25, and an eDP driver S26. In one embodiment, the parameter layer generating module S22 is configured to receive the timing parameter information of the image analyzed by the UART receiving and analyzing module in the EDID storing and switching module S3, generate the text layer according to the timing parameter information of the image, and select whether to display the text layer through a switch. The image superimposing module S23 is configured to superimpose the test image and the text image layer, and then output the superimposed test image and text image layer to the lcd through the video output interface, such as the LVDS interface, the MIPI interface, and the eDP interface, after driving the test image and the text image layer respectively through the LVDS driver S23, the MIPI driver S25, and the eDP driver S26.
In the embodiment of the application, the support of different interfaces is ensured by integrating a plurality of decoding and driving modules. In one embodiment, the time sequence parameter information of the image is obtained by analyzing the EDID information, and a parameter layer such as a text layer is generated according to the time sequence parameter information of the image, so that the visualization of the parameter information is ensured.
In an illustrative example, the EDID storage and switching module S3 may include an interface processing module such as an I2C slave module S31, a read control module such as an SRAM read control module S32, a storage module such as an SRAM module S33, a write control module such as an SRAM write control module S34, a URAT reception and analysis module S35.
In one embodiment, the I2C slave module S31 is configured to receive an I2C signal from the PC for reading EDID information, then parse the I2C signal to obtain a read command, read address information, and convert data read from the SRAM module S33 into an I2C signal for output;
The SRAM read control module S32 is used for receiving the read command and the read address information output by the I2C slave module S31, converting the read command into a read enable signal of the SRAM, converting the read address of the I2C into an address signal of the SRAM, and reading corresponding EDID file data from the SRAM module S33;
An SRAM module S33, configured to store an EDID file; and receiving the read enable and read address signals output by the SRAM read control module S32, and returning corresponding read data to the SRAM read control module S32. In one embodiment, the size of the EDID file is a maximum of 256 bytes, that is, the SRAM module occupies 256 bytes of space.
The SRAM write control module S34, configured to receive the EDID data output from the URAT receiving and analyzing module S35, convert the EDID data into write enable, write address and write data signals of the SRAM, and write the EDID file into the SRAM module S33;
The URAT receiving and analyzing module S35 is configured to receive the EDID file sent from the upper computer through the UART serial port, analyze the serial port data, convert the serial port data into EDID data, output the EDID data to the SRAM write control module S34, analyze the timing parameter information of the image from the EDID data, and output the timing parameter information to the parameter layer generating module S21 in the screen driving module S2.
According to the liquid crystal display detection device provided by the embodiment of the application, a single-chip scheme is realized by adopting the FPGA, so that the hardware complexity is reduced, and the EDID file is updated by utilizing a simple UART serial port, so that the support of any resolution is simply and conveniently realized. The embodiment ensures the support of different interfaces by integrating a plurality of decoding and driving modules. In one embodiment, the time sequence parameter information of the image is obtained by analyzing the EDID information, and a parameter layer such as a text layer is generated according to the time sequence parameter information of the image, so that the visualization of the parameter information is ensured.
Fig. 9 is a flow chart of a method for detecting a liquid crystal display screen according to an embodiment of the present application, as shown in fig. 8, applied to a liquid crystal display screen detection device implemented based on an FPGA, including:
Step 900: and selecting corresponding EDID information from the stored more than one EDID information according to the resolution of the liquid crystal display to be detected, wherein the stored more than one EDID information is written in by the upper computer through the UART serial port.
Step 901: and reading the selected EDID information according to the detection request, so that the detection equipment outputs an image with resolution corresponding to the read EDID information.
Step 902: and outputting the obtained image to a liquid crystal display screen to be detected so as to realize the detection of the liquid crystal display screen to be detected.
In an exemplary embodiment, the method further includes: analyzing time sequence parameter information of the image from the EDID file, generating a text layer according to the time sequence parameter information of the image, and outputting the test image and the text layer to a liquid crystal display to be detected after overlapping.
In one illustrative example, new EDID information is additionally stored according to an update request.
The detection method of the liquid crystal display screen is applied to an EDID information acquisition device realized based on an FPGA, at least one EDID information corresponding to the resolution is stored, and the EDID information corresponding to the resolution of the liquid crystal display to be detected currently is selected and determined, so that when the resolution needs to be changed, the EDID information corresponding to the resolution of the liquid crystal display to be detected is simply, quickly and conveniently switched to the EDID information corresponding to the resolution needing to be changed, thereby not only achieving a good detection effect, but also improving the detection efficiency of the liquid crystal display screen.
The embodiment of the application also provides a computer readable storage medium, which stores computer executable instructions for executing the liquid crystal display screen detection method according to any one of the above.
The embodiment of the application further provides a computer device, which comprises a memory and a processor, wherein the memory stores the following instructions executable by the processor: a step for executing the liquid crystal display screen detection method of any one of the above.
Although the embodiments of the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.

Claims (15)

1. An EDID information acquisition device, wherein the EDID information acquisition device is realized based on a field programmable gate array FPGA, comprising: the device comprises a storage module, a read control module, an interface processing module and a write control module; wherein,
The storage module is used for storing more than one Extended Display Identification Data (EDID) files, and each EDID file comprises EDID information of liquid crystal display screens with different resolutions; receiving a write enabling signal, write address information and a write data signal from the write control module, and writing corresponding data into an address corresponding to the write address information in the storage module;
the interface processing module is used for receiving a detection request from equipment for detecting the liquid crystal display and analyzing the detection request to obtain a read command and read address information; converting the EDID file from the read control module into a signal supported by the interface processing module and outputting the signal to the device for detecting the liquid crystal display;
The read control module is used for receiving a read command and read address information from the interface processing module, converting the read command into a read enabling signal of the storage module, taking the read address information as address information for reading the storage module, reading an EDID file corresponding to the address information from the storage module, and outputting the read EDID file to the interface processing module;
the write control module is used for receiving signals for writing the EDID information from the upper computer, and converting the signals for writing the EDID information into write enable signals, write address information and write data signals;
The information acquisition device changes an initialization file of the storage module under the condition that the EDID file information stored in the storage module is not matched with the resolution ratio of the liquid crystal display to be detected, adds a new EDID file, compiles the new EDID file and downloads the new EDID file to the FPGA again.
2. The EDID information obtaining apparatus according to claim 1, wherein the EDID information obtaining apparatus further includes a selection module; the selection module is used for: outputting the EDID file serial number of the EDID file where the resolution of the liquid crystal display to be detected corresponds to the EDID information to an external display device and displaying the EDID file serial number.
3. The EDID information obtaining apparatus according to claim 1, wherein the memory module is a static random access memory SRAM; the read control module is an SRAM read control module; the write control module is an SRAM write control module.
4. The EDID information obtaining apparatus according to claim 1, wherein the interface processing module is an I 2 C slave module.
5. A liquid crystal display detection device, comprising: a decoding and liquid crystal driving section and the EDID information obtaining apparatus according to any one of claims 1 to 4; the decoding and liquid crystal driving part comprises an input and selection module and a screen driving module;
The input and selection module is used for decoding the image from the video input interface; detecting the format of the decoded data, comparing and judging the decoded data with the read EDID time sequence information, and outputting an image with correct format and resolution corresponding to the read EDID information to the screen driving module as a test image;
The screen driving module is used for receiving time sequence parameter information of an image corresponding to the EDID information written by the upper computer through the UART serial port from the EDID information acquisition device, generating a text image layer according to the time sequence parameter information of the image, superposing the text image layer on a test image, and outputting the test image to the liquid crystal display screen for display through the video output interface.
6. The liquid crystal display detection apparatus according to claim 5, the screen driving module further comprising a switch by which whether to display the text layer on the test image is selected.
7. The lcd screen detecting apparatus of claim 5 or 6, wherein the input and selection module comprises one or any combination of DVI decoding, HDMI decoding, DP decoding, and a built-in test chart, format matching detection and selection module; wherein,
The DVI decoding, the HDMI decoding and the DP decoding are respectively used for decoding the DVI, HDMI, DP video input interface input signals;
the built-in test chart is used for generating a test image according to the EDID time sequence information;
The format matching detection and selection module is used for detecting the format of the decoded data, comparing and judging the decoded data with the EDID time sequence information and outputting a test image.
8. The lcd screen detection apparatus of claim 7, the input and selection module further comprising a gating module;
The gating module receives the selection signal from the format matching detection and selection module and selects and outputs a test image with a correct format; and if no signal or incorrect format exists, selecting valid test image output according to the selection signal.
9. The liquid crystal display detection apparatus according to claim 5 or 6, wherein the screen driving module comprises a parameter layer generating module, an image superimposing module, and one or any combination of LVDS driving, MIPI driving, and eDP driving; wherein,
The parameter layer generating module is used for receiving the time sequence parameter information of the image analyzed by the UART receiving and analyzing module in the EDID storing and switching module and generating a character layer according to the time sequence parameter information of the image;
The image superposition module is used for superposing the test image and the text image layer, and outputting the test image and the text image layer to the liquid crystal display screen through the video output interface after the test image and the text image layer are respectively driven by the LVDS drive, the MIPI drive and the eDP drive.
10. A liquid crystal display detection method, characterized by being applied to the liquid crystal display detection apparatus as claimed in any one of claims 5 to 9, comprising:
Selecting corresponding EDID information from more than one stored EDID information according to the resolution of the liquid crystal display to be detected currently, wherein the more than one stored EDID information is written in by an upper computer through a UART serial port;
Reading the selected EDID information according to the detection request, so that the detection equipment outputs an image with resolution corresponding to the read EDID information;
And outputting the obtained image to a liquid crystal display screen to be detected so as to realize the detection of the liquid crystal display screen to be detected.
11. The liquid crystal display detection method according to claim 10, further comprising: and displaying the EDID file serial number corresponding to the currently selected EDID information.
12. The liquid crystal display detection method according to claim 10 or 11, further comprising: according to the update request, new EDID information is additionally stored.
13. The liquid crystal display detection method according to claim 10, further comprising:
analyzing time sequence parameter information of an image from an EDID file corresponding to the EDID information;
And generating a text image layer according to the time sequence parameter information of the image, and outputting the test image and the text image layer to the liquid crystal display screen to be detected after the test image and the text image layer are overlapped.
14. A computer-readable storage medium storing computer-executable instructions for performing the liquid crystal display detection method according to any one of claims 10 to 13.
15. A computer device comprising a memory and a processor, wherein the memory has stored therein instructions executable by the processor to: a step for performing the liquid crystal display detection method according to any one of claims 10 to 13.
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