Test apparatus and system for display devices

Abstract

This application relates to a testing device and system for display devices, specifically in the field of multimedia signal processing technology. The testing device includes: a first signal processing module, a first frequency division module, and a second frequency division module. The first signal processing module is configured to: receive a first interface signal output by the display device under test based on a test signal; convert the first interface signal into a second interface signal with first display parameters and output it through a first output terminal of the second interface; and output a second interface signal with second display parameters through a second output terminal of the second interface, wherein the first display parameters and the second display parameters are different. The first frequency division module is configured to divide the received second interface signal into multiple outputs to the second interface input ports of the display device under test. The second frequency division module is configured to divide the received second interface signal into multiple outputs to the second interface input ports of the display device under test. This embodiment helps improve the testing efficiency of display devices.

Description

Technical Field

[0001] This application relates to the field of digital television and multimedia signal processing technology, and in particular to a test device and a test system for a display device. Background Technology

[0002] In the production process of display devices such as televisions, testing is typically required to evaluate their performance and quality. Related technologies often employ an external signal generator for this purpose. The test signal generated by the external generator is input to the display device through its input signal interface. The image displayed on the screen is then captured manually or using image acquisition equipment. This captured image is then compared to the image generated by the external signal generator to perform the display device test.

[0003] However, this method of testing display devices suffers from low testing efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a testing device and a testing system for display devices that can perform testing at low cost and with high efficiency, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a testing device for a display device. The testing device includes: a first signal processing module, a first frequency division module, and a second frequency division module;

[0006] The first signal processing module is configured with a first interface input terminal, a second interface first output terminal and a second interface second output terminal. The first interface input terminal is connected to the first interface output terminal of the display device under test, the second interface first output terminal is connected to the first frequency divider module, and the second interface second output terminal is connected to the second frequency divider module.

[0007] The first signal processing module is configured to: receive a first interface signal output by the display device under test based on a test signal through a first interface signal input terminal; convert the first interface signal into a second interface signal having a first display parameter and a second interface signal having a second display parameter; output the second interface signal having the first display parameter through a first output terminal of the second interface; and output the second interface signal having the second display parameter through a second output terminal of the second interface. The first display parameter and the second display parameter are different, and the first display parameter and the second display parameter include at least one of resolution, refresh rate, and color depth.

[0008] The first frequency divider module is configured with multiple second interface output ports, which are connected to the second interface input ports of the display device under test. It is configured to divide the received second interface signal with first display parameters into multiple second interface signals and output them through the configured multiple second interface output ports.

[0009] The second frequency divider module is configured with multiple second interface output ports, which are connected to the second interface input ports of the display device under test. It is configured to divide the received second interface signal with second display parameters into multiple second interface signals and output them through the multiple second interface output ports.

[0010] The test device based on the embodiments of this application has a first signal processing module connected to the first interface output terminal of the display device under test. It can receive the first interface signal output by the display device under test based on the test signal, and convert the first interface signal into two second interface signals with different display parameters. The first interface signal is further divided into multiple second interface signals by the first frequency division module and the second frequency division module, respectively. This allows the test device to obtain multiple second interface signals with first display parameters and multiple second interface signals with second display parameters based on the input first interface signal. Accordingly, the performance of multiple different display parameters of the display device under test can be tested based on the first interface signal output by the display device under test, which helps to improve the testing efficiency of the display device.

[0011] Secondly, this application also provides a testing system for display devices. The testing system includes:

[0012] The display device under test is equipped with a first interface output terminal and multiple second interface input terminals;

[0013] The test equipment described in any of the embodiments above;

[0014] The display device under test is configured to output a first interface signal to the test device based on locally stored test signals through the first interface output terminal.

[0015] The first interface output terminal outputs a first interface signal to the test device, and receives the signal output by the test device through multiple input ports. Based on the display screen of the test signal and the received signal, the test result of the test on the display device under test is determined, wherein the multiple input ports include multiple second interface input terminals.

[0016] The testing system based on this embodiment incorporates a built-in test signal in the display device under test (DUT). The DUT can output the built-in test signal to the testing system through a first interface output terminal to perform testing on the DUT. This eliminates the need to purchase and use an external signal generator, achieving low-cost testing of the display device. Furthermore, the first signal processing module of the testing system, connected to the first interface output terminal of the DUT, can receive the first interface signal output by the DUT and convert it into two second interface signals with different display parameters. These signals are then further divided into multiple second interface signals by a first frequency divider module and a second frequency divider module, respectively. This allows the testing system to obtain multiple second interface signals with first display parameters and multiple second interface signals with second display parameters based on the input first interface signal. Consequently, the system can perform performance testing on multiple different display parameters of the DUT based on the first interface signal output by the DUT, improving testing efficiency and achieving low-cost and high-efficiency testing of the display device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the module structure of a test device for a display device in one embodiment;

[0018] Figure 2 This is a schematic diagram of the module structure of a test device for a display device in another embodiment;

[0019] Figure 3 This is a schematic diagram of the module structure of the test device for the display device in another embodiment;

[0020] Figure 4 This is a schematic diagram showing the connection relationship between the control unit and various modules in one embodiment;

[0021] Figure 5 This is a schematic diagram showing the connection relationship between the control unit and the modules in another embodiment;

[0022] Figure 6 This is a partial module structure diagram of the first signal processing module in one embodiment;

[0023] Figure 7 This is a schematic diagram of the processing flow of the first signal processing module for image testing in one embodiment;

[0024] Figure 8 This is a schematic diagram illustrating the connection relationship between the switch module, the first compensation module, and the second compensation module in one embodiment.

[0025] Figure 9 This is a partial structural diagram of the input and output of the first frequency divider module in one embodiment;

[0026] Figure 10 This is a partial structural diagram of the input and output of the second frequency divider module in one embodiment;

[0027] Figure 11 This is a schematic diagram illustrating the processing principle of the display device under test in one embodiment;

[0028] Figure 12 This is a schematic diagram illustrating the principle of image testing and comparison in one embodiment;

[0029] Figure 13 This is a schematic diagram illustrating the principle of audio testing in one embodiment;

[0030] Figure 14 This is a schematic diagram of the structure of a test system in a specific example.

[0031] Figure 15 A simplified flowchart of the testing process in a specific example;

[0032] Figure 16 This is a schematic diagram of a test process combined with a production management system, as shown in a specific example. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0036] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0039] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0040] It should be noted that all information and data involved in this application (including but not limited to data used for analysis, stored data, and displayed data) are information and data authorized by the user or fully authorized by all parties, and the acquisition, transmission, storage, use, and processing of the relevant data comply with the relevant provisions of national laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, and their purpose is merely to illustrate the feasibility of implementing the technical solution of this application, but does not imply that the applicant has already used or necessarily used such solutions.

[0041] Currently, testing display devices in related technologies typically involves inspecting the device's circuit boards and signal ports. These signal ports include, but are not limited to, HDMI (High Definition Multimedia Interface, a fully digital video and audio transmission interface) ports and AV (AV interface, a composite video interface for transmitting analog audio and video signals) ports. Taking a television as an example, the display device's circuit boards are also called TV circuit boards. In related technologies, these circuit boards include SOC (System on Chip) circuit boards, and the signal ports typically include, but are not limited to, HDMI and AV terminals.

[0042] In related technologies, when testing the entire display device and its related signal ports, it is common to rely on an external signal generator to generate a standard test signal that is then input into the display device. The display device displays the image signal from the standard test signal, and plays the audio signal through an audio player. The signal quality is judged by human visual inspection or listening. For example, the tester visually judges whether there is screen tearing, stuttering, or color distortion, or obtains the image displayed by the display device through a video capture device (such as a camera). The captured image is then compared with the image in the standard test signal to determine whether there are any abnormalities.

[0043] These methods of testing display devices require the purchase of specialized signal generators, which are expensive. Deploying signal generators across multiple workstations on a production line results in a huge investment. Furthermore, each test requires manual intervention to switch between signal sources and visual inspection, leading to lengthy testing times for each display device and severely impacting testing efficiency. Moreover, manual judgment is susceptible to fatigue and visual biases, resulting in a relatively high rate of missed detections.

[0044] Research has shown that display devices typically have at least one signal output interface and multiple different signal input ports. Therefore, for test signals output by display devices through their signal output interfaces, a testing device can convert these signals into interface signals corresponding to the various signal ports before outputting them to the display device for display. Based on the different display parameter requirements of display devices, the testing device can also convert received test signals into interface signals with corresponding display parameters, thereby improving testing efficiency.

[0045] Furthermore, by embedding or storing test signals within the display device, there is no need to purchase an external signal generator. This allows the display device to compare the signals received from the test device with the test signals stored within the display device itself, thereby improving testing efficiency and reducing the cost of testing display devices. Moreover, by setting up a host computer, the entire testing process can be controlled via the host computer, and the test results obtained by the display device under test can be displayed on the host computer so that testers can understand the test results, enhancing interactivity.

[0046] Accordingly, embodiments of this application provide a testing device for a display device, wherein, with reference to Figure 1 As shown, the test device 20 includes: a first signal processing module 201, a first frequency division module 202, and a second frequency division module 203.

[0047] The first signal processing module 201 is configured with a first interface input terminal, a second interface first output terminal and a second interface second output terminal (not shown in the figure). The first interface input terminal is connected to the first interface output terminal 101 of the display device under test 10, the second interface first output terminal is connected to the first frequency divider module 202, and the second interface second output terminal is connected to the second frequency divider module 203.

[0048] The first signal processing module 201 is configured to: receive a first interface signal output by the display device under test 10 based on a test signal through a first interface signal input terminal, convert the first interface signal into a second interface signal with a first display parameter and a second interface signal with a second display parameter, output the second interface signal with the first display parameter through a first output terminal of the second interface, and output the second interface signal with the second display parameter through a second output terminal of the second interface. The first display parameter and the second display parameter are different, and the first display parameter and the second display parameter include at least one of resolution, refresh rate and color depth.

[0049] The first frequency divider module 202 is configured with multiple second interface output ports, which are connected to the second interface input port 102 of the display device under test 10. The first frequency divider module 202 is configured to divide the received second interface signal with first display parameters into multiple second interface signals and output them through the configured multiple second interface output ports.

[0050] The second frequency divider module 203 is configured with multiple second interface output ports, which are connected to the second interface input ports of the display device under test. The first frequency divider module 202 is configured to divide the received second interface signal with second display parameters into multiple second interface signals and output them through the multiple second interface output ports.

[0051] The first interface input terminal of the first signal processing module 201 refers to the input port with an interface type of the first interface, used to input signals of the first interface type into the first signal processing module 201. The first output terminal of the second interface of the first signal processing module 201 refers to the output port with an interface type of the second interface, used to output signals of the second interface type from the first signal processing module 201. The second output terminal of the second interface refers to the other output port with an interface type of the second interface, used to output signals of the second interface type from the first signal processing module 201.

[0052] The second interface output port configured in the first frequency divider module 202 refers to the output port with an interface type of second interface, used by the first frequency divider module 202 to output signals of the second interface type. The second interface output port configured in the second frequency divider module 203 refers to the output port with an interface type of second interface, used by the second frequency divider module 203 to output signals of the second interface type. The first interface signal refers to the signal type corresponding to the first interface, and the second interface signal refers to the signal type corresponding to the second interface.

[0053] The types of the first and second interfaces are not limited. In the relevant embodiments of this application, the first interface can be a USB (Universal Serial Bus) interface, and the second interface can be an HDMI interface, thereby enabling testing of multiple HDMI interfaces of the display device. In this case, the first interface signal is a USB signal, and the second interface signal is an HDMI signal. Depending on the interface differences of the display device under test, when the first interface is a USB interface, it can include either a USB 2.0 interface or a USB 3.0 interface. To improve the compatibility of the testing equipment 20, in the relevant embodiments of this application, the first interface can simultaneously include both a USB 2.0 interface and a USB 3.0 interface.

[0054] The first and second display parameters are parameters related to the display device's display of video or images, including but not limited to resolution, refresh rate, and color depth, allowing for testing based on different display parameters as needed. In some specific examples, the resolution in the first display parameter is greater than the resolution in the second display parameter. The refresh rate in the first display parameter is greater than the refresh rate in the second display parameter. Color depth in some examples includes, but is not limited to, 8-bit, 10-bit, and 12-bit, and refresh rates in some examples include, but are not limited to, 60Hz, 120Hz, 144Hz, 165Hz, and 195Hz.

[0055] The first frequency divider module divides the second interface signal with the first display parameter into multiple second interface signals. In a specific example, the second interface signal with the first display parameter can be copied to obtain multiple second interface signals with the first display parameter by means of copying, etc. That is, a second interface signal with the first display parameter input to the first frequency divider module can be output after passing through the first frequency divider module to achieve frequency division of the signal.

[0056] Similarly, a second interface signal with a second display parameter input to the second frequency divider module can output multiple second interface signals with a second display parameter after passing through the second frequency divider module, thereby realizing the frequency division of the signal.

[0057] Based on the test equipment exemplified above, when applied to a specific test process, the test process may include:

[0058] The display device under test 10 acquires the test signal stored internally and outputs the test signal through the first interface signal output terminal 101.

[0059] The first signal processing module 20 receives the test signal (i.e., the first interface signal) through the first interface signal input terminal, and converts the first interface signal into a second interface signal with a first display parameter and a second interface signal with a second display parameter. The second interface signal with the first display parameter is output to the first frequency divider module through the first output terminal of the second interface, and the second interface signal with the second display parameter is output to the second frequency divider module through the second output terminal of the second interface.

[0060] The first frequency divider module 202 receives a second interface signal with a first display parameter, divides it into multiple second interface signals with the first display parameter, and outputs them to the second interface input port of the display device under test 10 through multiple configured second interface output ports.

[0061] The second frequency divider module 203 receives the second interface signal with the second display parameters, divides it into multiple second interface signals with the second display parameters, and outputs them to the second interface input port of the display device under test 10 through multiple configured second interface output ports.

[0062] The display device under test 10 receives the second interface signal input by the first signal processing module 20 through the second interface input port. During the process of displaying the image of the second interface signal through the screen, the display screen is collected or extracted, and the display screen is compared with the test screen when the test signal is directly displayed through the screen. Based on this, the image test result can be obtained. Based on the image test result, the image display performance of the display device under test can be tested and evaluated.

[0063] For the audio signal in the received second interface signal, the audio signal can be played through an audio playback component (such as a speaker), and the audio test results can be obtained by detecting the audio parameters of the played audio signal, including but not limited to the audio signal amplitude and audio signal frequency. The audio playback performance of the display device can be tested and evaluated through the audio test results.

[0064] In the aforementioned testing process, a second interface signal with first display parameters can be generated and output to the display device under test (DUT) based on the display parameters of the display device, or a second interface signal with second display parameters can be output to the DUT. This allows for testing of the DUT that needs to display the first display parameters, or testing of the DUT that needs to display the second display parameters. Where the DUT can simultaneously support both the first and second display parameters, the generated second interface signal with the first display parameters and the second interface signal with the second display parameters can be sequentially output to the DUT to test and evaluate the image displayed with the first display parameters and the image displayed with the second display parameters, respectively.

[0065] The test device based on the embodiments of this application has a first signal processing module connected to the first interface output terminal of the display device under test. It can receive the first interface signal output by the display device under test and convert the first interface signal into two second interface signals with different display parameters. The first interface signal is further divided into multiple second interface signals by the first frequency division module and the second frequency division module, respectively. This allows the test device to obtain multiple second interface signals with first display parameters and multiple second interface signals with second display parameters based on the input first interface signal. Accordingly, the performance of multiple different display parameters of the display device under test can be tested based on the first interface signal output by the display device under test, which helps to improve the testing efficiency of the display device.

[0066] refer to Figure 2 As shown, in some embodiments, the test device 20 further includes: a switch module 204 and a second signal processing module 205. Wherein:

[0067] The first output terminal of the second interface of the first signal processing module 201 is connected to the first frequency divider module 202 through the switch module 204. The first output terminal of the second interface is also connected to the second signal processing module 205 through the switch module 204. The output terminal of the second signal processing module 205 is connected to the third interface input port 103 of the display device under test 10.

[0068] The switch module 204 is configured to, according to the received control command, connect the first output terminal of the second interface of the first signal processing module 201 to the first frequency divider module 202 and the second signal processing module 205, that is, the switch module 204 connects the first output terminal of the second interface of the first signal processing module 201 to the first frequency divider module 202, or connects the first output terminal of the second interface of the first signal processing module 201 to the second signal processing module 205, based on the received control command.

[0069] The second signal processing module 205 is configured to convert the received second interface signal with the first display parameters into a third interface signal and then output it to the third interface input port 103 of the display device under test 10.

[0070] The third interface input port refers to the port with the interface type of the first interface, and the third interface signal refers to the signal type corresponding to the third interface. The type of the third interface is not limited. In the relevant embodiments of this application, the third interface can be a DP (DisplayPort, a computer display interface standard for digital video and audio transmission) port.

[0071] Since the first signal processing module 201 can only output two signals when converting the first interface signal to the second interface signal—one with the first display parameters and the other with the second display parameters—and taking an HDMI interface as an example, the display device under test may require supporting up to four HDMI signals while also being compatible with DP signals, in this embodiment, a switching module can be used to split one HDMI signal into two HDMI signals as needed. One signal is used for output as an HDMI signal, while the other is converted to a third interface signal for output. In related examples, the switching module can be a high-speed switching module to improve the efficiency of signal switching.

[0072] Taking the second interface signal as an HDMI signal as an example, in the relevant embodiments of this application, the second interface signal with the first display parameter can be referred to as the HDMIA signal, which can be an HDMI signal with a resolution of 8K and a refresh rate of 120Hz. The second interface signal with the second display parameter can be referred to as the HDMIB signal, which can be an HDMI signal with a resolution of 4K and a refresh rate of 60Hz.

[0073] The display device under test is usually equipped with a DP port, and more and more DP ports use the DP1.4 protocol. The theoretical bandwidth of the DP 1.4 interface is as high as 32.4Gbps. In actual use, interface and environmental factors will affect the bandwidth, and the actual bandwidth is about 25.92Gbps. This allows the DP 1.4 interface to support 8K resolution at 30Hz or 4K resolution at 120Hz. Therefore, it can be converted by HDMI A signal with a higher resolution (i.e., HDMI signal with 8K resolution and 120Hz refresh rate) to obtain a DP signal with the resolution required for DP signal, so as to meet the signal bandwidth requirements of the display device under test for better and longer-term compatibility.

[0074] Accordingly, in the relevant examples, the control pins of the control switch module (including but not limited to) can be controlled. Figure 8The high or low level state of the A / B_SELT control pin can be used to select whether the switch module 204 is connected to the first frequency divider module 202 to divide the HDMIA signal into multiple HDMI signals for output, or to select whether the switch module 204 is connected to the second signal processing module 205 to convert the HDMIA signal into a DP signal for output.

[0075] Accordingly, based on the second interface signal with the first display parameters obtained from the first signal processing module, the second interface signal can be selectively output to the display device under test by turning on the switch module to test the display device with the second interface. Alternatively, the second interface signal can be selectively output to the second signal processing module to convert the second interface signal into a third interface signal to test the display device under test receiving signals and displaying them through the third interface. This allows the same test device to output signals of multiple different interface types, enabling the testing of display devices with multiple different interface types.

[0076] refer to Figure 3 As shown, in some embodiments, the test device 20 further includes: a first compensation module 206 and a second compensation module 207. Wherein:

[0077] The first compensation module 206 is connected between the switch module 204 and the first frequency divider module 202, and the second compensation module 207 is connected between the switch module 204 and the second signal processing module 205. That is, the first output terminal of the second interface of the first signal processing module 201 is connected to the first frequency divider module 202 in sequence through the switch module 204, the first compensation module 206, and the first output terminal of the second interface is also connected to the second signal processing module 205 in sequence through the switch module 204, the second compensation module 207, and the output terminal of the second signal processing module 205 is connected to the third interface input port 103 of the display device under test 10.

[0078] At this time, the switch module 204 is configured to receive and respond to a control command to connect the first output terminal of the second interface of the first signal processing module 201 with the first compensation module 206 and the second compensation module 207. That is, based on the received control command, the switch module 204 connects the connection between the first output terminal of the second interface of the first signal processing module 201 and the first compensation module 206, or connects the connection between the first output terminal of the second interface of the first signal processing module 201 and the second compensation module 207.

[0079] The first compensation module 206 is configured to perform signal compensation on the second interface signal with the first display parameters received from the switch module 204, and output the signal-compensated second interface signal to the first frequency divider module 202.

[0080] The second compensation module 207 is configured to perform signal compensation on the second interface signal with the first display parameter received from the switch module 204, and output the signal-compensated second interface signal to the second signal processing module 205.

[0081] At this time, the second signal processing module 205 is configured to convert the received signal-compensated second interface signal, i.e. the signal-compensated second interface signal with the first display parameters, into a third interface signal and output it to the third interface input port 103 of the display device under test 10.

[0082] When the second interface signal obtained by the first signal processing module 201 is output through the switching module 204, the switching module 204 may cause certain losses to the second interface signal due to insertion loss, differential return loss, differential crosstalk and differential shutdown isolation, so that the waveform of the second interface signal output by the switching module is deformed relative to the second interface signal received by the switching module, such as a decrease in amplitude and a smoother rise or fall edge.

[0083] Therefore, by using the first compensation module 206 and the second compensation module 207 to perform signal compensation on the second interface signal received from the switch module 204, the consistency between the second interface signal reaching the first frequency division module 202 and the second signal processing module 205 and the second interface signal output from the first signal processing module 201 can be improved, thereby improving the testing accuracy of the display device under test.

[0084] The method by which the first compensation module 206 and the second compensation module 207 perform signal compensation on the received signal is not limited. In some examples:

[0085] The first compensation module 206 is also configured to acquire the input-output signal difference of the switch module 204, and to perform signal compensation on the second interface signal with the first display parameter received from the switch module 204 based on the input-output signal difference.

[0086] The second compensation module 207 is also configured to acquire the input-output signal difference of the switch module 204, and to perform signal compensation on the second interface signal with the first display parameter received from the switch module 204 based on the input-output signal difference.

[0087] The input / output signal difference includes the second interface signal with the first display parameter entering the switch module, and the difference information of the second interface signal with the first display parameter output from the switch module. The input / output signal difference includes, but is not limited to, at least one of: amplitude difference information, signal rising edge difference information, and signal falling edge difference information.

[0088] The method of obtaining the input-output signal difference is not limited. In some examples, a detection unit (not shown in the figure) can be set to detect the first signal parameter of the second interface signal entering the switch module 204 and detect the second signal parameter of the second interface signal output from the switch module 204. The input-output signal difference is obtained by comparing the difference between the first signal parameter and the second signal parameter.

[0089] In other examples, the first compensation module 206 and the second compensation module 207 can be connected to a related control unit (such as...). Figure 2 , 3 The control unit 208 receives control signals from the control unit and compensates the first compensation module 206 and the second compensation module 207 accordingly. The first compensation module 206 and the second compensation module 207 can be connected to the control unit via I2C (Inter-Integrated Circuit) or similar methods. They adjust the pre-emphasis and amplitude register of the HDMI signal input from the switching module using the received control signals to compensate for the signal loss after passing through the switching module. This satisfies the signal quality requirements of the next-level processing modules (including but not limited to the first frequency divider module 202 and the second signal processing module 205), ensuring that the final display device under test receives the correct signal for comparison, thereby improving test accuracy. Some examples show the signal before compensation, such as... Figure 8 As shown in waveform 801, the signal after signal compensation is as follows: Figure 8 As shown in waveform 802, the signal amplitude is significantly improved after compensation.

[0090] In some examples, the first signal processing module 201 is further configured with a composite signal output terminal, which is connected to the composite signal input port 104 of the display device under test 10. In this case, the first signal processing module 201 is also configured to convert the first interface signal into a composite signal and output the composite signal to the display device under test 10 through the composite signal output terminal, such as through the composite signal input port 104 of the display device under test 10.

[0091] Accordingly, the first signal processing module can further convert the first interface signal into a composite signal, thereby realizing the detection of the composite signal interface of the display device under test.

[0092] refer to Figure 2 , Figure 3As shown, in some examples, the test device 20 may also include a control unit 208. The specific form of the control unit 208 is not limited. In the relevant embodiments of this application, the control unit 208 includes an MCU (Micro Control Unit) as an example for illustration.

[0093] The control unit 208 can act as the main control device to control the first signal processing module 201 and other processing units (such as the analog-to-digital conversion unit of the display device under test). Figure 4 As shown. When the control unit 208 acts as the main control device, the control unit 208 can communicate with the first signal processing module 201 via I2C or SPI (Serial Peripheral Interface) to select the parameters of the signal output by the first signal processing module 201, such as HDMI parameters. Specific HDMI parameters include, but are not limited to, color depth, color gamut space, and output channels.

[0094] When the control unit 208 acts as the main control device, it communicates with the first signal processing module 201 via I2C or SPI bus to configure relevant output parameters, such as the resolution / refresh rate / color depth (e.g., 4K / 120Hz / 8Bit) parameters of the HDMI output. The GPIO (General Purpose Input Output) pins in the control unit 208 can control the enable state of the encoder in the first signal processing module 201 and the switching of HDMI channels. The control unit 208 can also interact with the analog-to-digital output module of the display device under test via SPI bus or other means to obtain audio test results.

[0095] In some examples, the control unit 208 is connected to the first signal processing module 201, in which case:

[0096] The first signal processing module 201 is configured to receive control commands from the control unit 208, convert the first interface signal into a second interface signal with first display parameters, a second interface signal with second display parameters, or a composite signal, and send control commands to the switch module 204 based on the control commands from the control unit 208 to control the working state of the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency divider module 202, the second signal processing module 205, and the second frequency divider module 203.

[0097] In specific operation, the control unit 208 can send control commands to the first signal processing module 201. The control commands may include the module identifiers and corresponding command information of the first signal processing module 201, the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency division module 202, the second signal processing module 205, and the second frequency division module 203.

[0098] After receiving the control command, the first signal processing module 201 obtains the instruction information corresponding to the module identifier of the first signal processing module 201. Based on the instruction information, it completes the processing of the first interface signal and sends the control command or other module identifiers and corresponding instruction information in the control command downwards. For example, it sends the instruction information corresponding to the module identifier of the second frequency divider module 203 to the second frequency divider module 203, and sends the module identifiers and corresponding instruction information of the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency divider module 202, and the second signal processing module 205 to the switch module 204.

[0099] After receiving the control command, the switch module 204 obtains the command information corresponding to its module identifier and completes the switching based on the command information, such as switching to connect with the first compensation module 206 or switching to connect with the second compensation module 207. It then sends the received control command or other module identifiers and corresponding command information from the control command downwards. For example, when switching to connect with the first compensation module 206, the module identifiers and corresponding command information of the first compensation module 206 and the first frequency divider module 202 are sent to the first compensation module 206; when switching to connect with the second compensation module 207, the module identifiers and corresponding command information of the second compensation module 207 and the second signal processing module 205 are sent to the second compensation module 207.

[0100] After receiving the control command, the first compensation module 206 obtains the instruction information corresponding to the module identifier of the first compensation module 206. Based on the instruction information, it completes the signal compensation of the received second interface signal, sends the signal-compensated second interface signal to the first frequency divider module 202, and sends the received control command or other module identifiers and corresponding instruction information in the control command downwards, such as sending the module identifier and corresponding instruction information of the first frequency divider module 202 to the first frequency divider module 202.

[0101] After receiving the control command, the second compensation module 207 obtains the instruction information corresponding to the module identifier of the second compensation module 207. Based on the instruction information, it completes the signal compensation of the received second interface signal, sends the signal-compensated second interface signal to the second signal processing module 205, and sends the received control command or other module identifiers and corresponding instruction information in the control command downwards, such as sending the module identifier and corresponding instruction information of the second signal processing module 205 to the second signal processing module 205.

[0102] In some examples, the control unit 208 is connected to the first signal processing module 201, the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency divider module 202, the second signal processing module 205, and the second frequency divider module 203. In this case:

[0103] The control unit 208 is configured to send corresponding control commands to the first signal processing module 201, the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency divider module 202, the second signal processing module 205, and the second frequency divider module 203 respectively, so as to control the working status of the first signal processing module 201, the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency divider module 202, the second signal processing module 205, and the second frequency divider module 203.

[0104] refer to Figure 2 , Figure 3 As shown, in some examples, a host computer 30 may also be provided. The first signal processing module 201 can receive control commands from the host computer through the control unit 208. In this case, the control unit 208 can act as a slave control device to control the first signal processing module 201 and other processing units (such as the analog-to-digital conversion unit of the display device under test). Figure 5 As shown. The first signal processing module 201 can also receive control commands from the host computer, that is, control of the first signal processing module, etc., can be achieved through control commands issued by the host computer.

[0105] When the control unit 208 acts as a slave control device, it can communicate with the host computer via a serial port and perform relevant configurations according to the host computer's testing requirements. For example, it can switch the output of the first signal processing module 201 to either an HDMI signal with a first display parameter or an HDMI signal with a second display parameter, or control the conduction state of the switch module 204. In some examples, pre-stored test cases can also be built into the control unit 208. Some possible test case parameters include, but are not limited to, a test case with a 4K resolution, a 30Hz refresh rate, and a YUV420 image encoding method, or a test case with a 1080 resolution, a 60Hz refresh rate, and an RGB888 image encoding method.

[0106] Taking the first signal processing module 201 as an example, which is connected to the host computer 30 and directly receives control commands from the host computer:

[0107] The first signal processing module 201 is configured to receive control commands from the control unit 208, convert the first interface signal into a second interface signal with first display parameters, a second interface signal with second display parameters, or a composite signal, and send control commands to the switch module 204 based on the control commands from the control unit 208 to control the working state of the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency divider module 202, the second signal processing module 205, and the second frequency divider module 203.

[0108] The control commands sent by the first signal processing module 201 to the switch module 204 can be sequentially sent to control the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency divider module 202, the second signal processing module 205, and the second frequency divider module 203 to control the working state of the switch module 204, the first compensation module 206, the second compensation module 207, the first frequency divider module 202, the second signal processing module 205, and the second frequency divider module 203. The specific method of sending the control commands is the same as the method of sending control commands based on the control unit 208 in the example above.

[0109] The specific structure of the first signal processing module 201 is not limited. In some embodiments, the first signal processing module 201 includes:

[0110] The video processing module is configured to decode the image signal in the first interface signal received from the first interface input terminal to obtain decoded pixel data, and encode the scaled decoded pixel data based on the target output interface to obtain an image signal corresponding to the target output interface.

[0111] The audio processing module is configured to decode the audio signal in the first interface signal received from the first interface input terminal to obtain decoded audio data.

[0112] The audio and video synthesis module is also used to synthesize the image signal corresponding to the target output interface and the decoded audio data to obtain the output interface signal corresponding to the target output interface.

[0113] The target output interface may include at least one of the second interface and the composite signal interface as described above. In this case, the obtained output interface signal may include at least one of the second interface signal (such as an HDMI signal) and the composite signal (AV signal). It is understood that when the target output interface is the second interface, the second interface signal obtained by the audio / video synthesis module corresponding to the target output interface may include the second interface signal corresponding to the first display parameter, and / or the second interface signal corresponding to the second display parameter.

[0114] In some specific examples, the video processing module includes:

[0115] The video decoder is configured to decode the video stream signal received from the first interface input to obtain decoded pixel data;

[0116] An image scaler is configured to scale the image size of the decoded pixel data based on the physical resolution of the display device under test, thereby obtaining scaled decoded pixel data. The physical resolution includes, but is not limited to, the resolution in the first display parameter or the resolution in the second display parameter.

[0117] The video encoder is configured to encode scaled, decoded pixel data based on a target output interface to obtain an image signal corresponding to the target output interface, such as an image signal with a first display parameter, or an image signal with a second display parameter.

[0118] Taking a USB interface as the first example, the video decoder receives compressed video streams from USB 2.0 / USB 3.0 and restores them to YUV / RGB raw pixel data through a hardware decoder. The video decoder can have a built-in multi-format decoding engine to support encoding and decoding of images at different resolutions, including but not limited to 4K resolution images with a refresh rate of 120Hz and 8K resolution images with a refresh rate of 60Hz. The video decoder can also be configured with HDCP (High Bandwidth Digital Content Protection) protocols, such as HDCP 2.3, to simultaneously protect digital content.

[0119] The image scaler can scale the image size of the decoded pixel data in any way. In some examples, it can dynamically adjust the image size according to the physical resolution of the display device under test (e.g., 1080p / 4K) using bilinear interpolation or edge adaptive algorithms. For example, it can scale a 2560×1440 signal to 1920×1080 to fit the display of the display device under test, or to fit the display that is reverse-displayed when testing the display device board (e.g., SOC board).

[0120] The encoding method of the video encoder is not limited. In relevant embodiments, the video encoder can perform visual lossless compression on the processed video, with a compression ratio of up to 3:1. In some embodiments, the bitrate can be dynamically determined, for example, by analyzing the redundancy between video frames and dynamically determining the bitrate based on the redundancy, so that high frame rate video (such as 120Hz) can still be transmitted under the bandwidth limitations of USB 2.0 / USB 3.0.

[0121] A schematic diagram of the structure of the first signal processing module 201 in a specific example is shown below. Figure 6 As shown, combined with Figure 6 It receives the first interface signal (USB signal) through the first interface input terminal (USB2.0 or USB3.0), and decodes the image signal in the first interface signal through the video processing module to obtain decoded pixel data. Based on the target output interface, it encodes the scaled decoded pixel data to obtain the image signal corresponding to the target output interface. Simultaneously, it decodes the audio signal in the USB signal through the audio processing module to obtain decoded audio data, and then uses the audio-video synthesis module (…) Figure 6 (Not shown in the image) Combines three output data: an HDMI signal with the first display parameter (e.g., ... Figure 6 HDMI A in the image), HDMI signals with second display parameters (such as...) Figure 6 The signals shown are HDMIB and composite signals (AV signals).

[0122] Continue to refer to Figure 6 As shown, the first signal processing module 201 is also provided with a GPIO module, which can be connected to the host computer or the control unit 208 to receive control commands from the host computer or the control unit 208.

[0123] Continue to refer to Figure 6As shown, the first signal processing module 201 is also equipped with an I2S (Inter-IC Sound, integrated circuit built-in audio bus) audio input module and an I2S audio output module. The I2S audio input module can import I2S audio files to realize the input of I2S audio files. The I2S audio output module can extract I2S audio files from USB signals to output I2S audio files.

[0124] based on Figure 6 The first signal processing module shown, taking the testing of HDMI signals as an example, can be illustrated by the following schematic diagram of its testing process: Figure 7 As shown. The image signal of the display device under test is output through the USB interface (USB2.0 or USB3.0) of the display device under test. After receiving the USB signal (i.e. the first interface signal), the first signal processing module performs video decoding to obtain the decoded image data, performs image scaling on the decoded image data, performs DSC encoding on the image data and the obtained audio data, obtains the HDMI signal, and outputs it through the HDMI interface.

[0125] In the processing of the first signal processing module 201, the first frequency division module 202, the second frequency division module 203, the switching module 204, the second signal processing module 205, the first compensation module 206, and the second compensation module 207, or due to interference from the transmission line, a DC component may be introduced, which may affect the reception and acquisition of the AC component. Therefore, in the relevant embodiments of this application, one or more coupling capacitors may be provided to filter out the DC component.

[0126] The placement of the coupling capacitor is not limited. In a specific example, the coupling capacitor may include:

[0127] The coupling capacitor is set between the first output terminal of the second interface and the switching module, such as Figure 8 The coupling capacitor C0 shown in the figure;

[0128] The coupling capacitor set between the switching module and the first compensation module, such as Figure 8 The coupling capacitor C1 shown in the figure;

[0129] The coupling capacitor set between the switching module and the second compensation module, such as Figure 8 The coupling capacitor C2 shown in the figure;

[0130] The coupling capacitor set between the first compensation module and the first frequency divider module, such as Figure 8 The coupling capacitor C3 shown in the figure;

[0131] A coupling capacitor is installed between the second compensation module and the second signal processing module;

[0132] The coupling capacitors set between each output terminal of the first frequency divider module and the second interface input port of the display device under test, taking the first frequency divider module dividing the received second interface signal into 4 HDMI signals as an example, the coupling capacitors set on the output lines of these 4 HDMI signals can be as follows: Figure 9 The coupling capacitors C4, C5, C6, and C7 shown in the figure;

[0133] A coupling capacitor is installed between the output of the second signal processing module and the third interface input port of the display device under test;

[0134] The coupling capacitors set between each output terminal of the second frequency divider module and the second interface input port of the display device under test, taking the second frequency divider module dividing the received second interface signal into 4 HDMI signals as an example, the coupling capacitors set on the output lines of these 4 HDMI signals can be as follows: Figure 10 The coupling capacitors C8, C9, C10, and C11 are shown in the figure.

[0135] Therefore, by setting a coupling capacitor to filter out the DC component, the accuracy of signal transmission can be improved, which in turn can improve the accuracy of testing display devices.

[0136] refer to Figure 9 , Figure 10 As shown, the motherboard of the display device under test usually has 4 HDMI input interfaces, and the HDMI signal output by the first signal processing module 201 is 2 channels. Therefore, the first frequency division module 201 and the second frequency division module 203 can be used to losslessly copy these 2 HDMI signals respectively, and ensure that they are output simultaneously.

[0137] Specifically, the second interface signal HDMIA with first display parameters output by the first signal processing module 201 is copied into four HDMIA signal outputs by the first frequency division module 202 after passing through the switch module 204 and the first compensation module 206. Simultaneously, the second interface signal HDMIB with second display parameters output by the first signal processing module 201 is also copied into four HDMIB signal outputs by the second frequency division module 203 to maximize the number of HDMI outputs.

[0138] The test equipment may also include relevant registers. These registers can be connected and communicated with modules such as the first signal processing module 201, the first compensation module 206, and the second compensation module 207 via a bus (such as an I2C bus). The first signal processing module 201 can determine whether the color gamut control of the image data is RGB or YUV based on the data stored in the registers. It can also determine the required output frequency and resolution based on the data stored in the registers to meet the requirements of the display device under test for signal input VRR (Video Refresh Rate) and HSR (Hierarchical State Routing).

[0139] This application also provides a testing system for display devices, combined with... Figures 1 to 3 As shown, the test system includes:

[0140] The display device under test 10 is configured with a first interface output terminal and multiple input ports. Referring to the example described above, the multiple input ports may include multiple second interfaces, third interfaces, and AV interfaces. Figures 1 to 3 The examples all demonstrate only one second interface.

[0141] The test equipment involved in any of the embodiments described above.

[0142] The display device under test 10 is configured to output a first interface signal to the test device 20 through the first interface output terminal 101 based on the test signal stored locally, and receive the signal output by the test device through multiple input ports. Based on the display screen of the test signal and the signal received from the input ports, the display device under test is tested.

[0143] The schematic diagram of the processing principle of the display device under test 10 during the test is shown below. Figure 11 As shown, specifically:

[0144] The display device under test 10 acquires the stored test image data and outputs the test image data to the screen for display through the display device under test board (SOC board). It also collects the image data output to the screen for display to obtain the collected test image data. After synthesizing and encoding the collected test image data and the built-in test audio data, it obtains the first interface signal and sends it to the test device through the first interface (USB interface).

[0145] The testing system based on this embodiment incorporates a built-in test signal in the display device under test (DUT). The DUT can output the built-in test signal to the testing system through a first interface output terminal to perform testing on the DUT. This eliminates the need to purchase and use an external signal generator, achieving low-cost testing of the display device. Furthermore, the first signal processing module of the testing system, connected to the first interface output terminal of the DUT, can receive the first interface signal output by the DUT and convert it into two second interface signals with different display parameters. These signals are then further divided into multiple second interface signals by a first frequency divider module and a second frequency divider module, respectively. This allows the testing system to obtain multiple second interface signals with first display parameters and multiple second interface signals with second display parameters based on the input first interface signal. Consequently, the system can perform performance testing on multiple different display parameters of the DUT based on the first interface signal output by the DUT, improving testing efficiency and achieving low-cost and high-efficiency testing of the display device.

[0146] Continue to combine Figures 1 to 3 As shown, in some examples, the test system may also include:

[0147] The host computer 30 is connected to the display device under test 10 and the test device 20.

[0148] The display device under test 10 is configured to receive and respond to the control commands of the host computer 30, and output the first interface signal to the test device 20 through the first interface output terminal 101 based on the locally stored test signal.

[0149] The test device 20 is configured to receive and, in response to control commands from the host computer 30, configure processing parameters for processing the first interface signal. Some possible processing parameters include, but are not limited to, output display parameters, such as the first display parameter or the second display parameter as described above.

[0150] The host computer 30 serves as the information platform and entry point, responsible for commanding and controlling the operation of the entire testing system. For example, according to the set test items and test standards, it controls the data acquisition and data feedback during the test process through serial port commands and other means, and uploads the obtained test data and test results to the MES system.

[0151] The host computer is the command platform for the entire system. It is responsible for communicating with the control unit 208 in the test equipment and judging the final test results based on the return values ​​of the test items. It is also responsible for communicating with the MES (manufacturing execution system, a production information management system for the workshop execution layer of manufacturing enterprises) and other systems to send the test results to the MES and other production control systems, so as to control the test data and the test workstation. Based on this, test control in the production management process can also be realized.

[0152] The method of testing the display device under test (DUT) based on the display screen of the test signal and the signal received from the input port is not limited. In some examples, the DUT 10 is configured to determine the brightness similarity, contrast similarity, and structural similarity between the display screen of the test signal and the image screen in the signal received from the input port, and obtain similarity parameters based on the brightness similarity, contrast similarity, and structural similarity, and obtain the detection result of the second interface input terminal based on the similarity parameters.

[0153] Among them, reference Figure 12 As shown, after the display device under test obtains the image from the signal received from the input port, it can also perform image preprocessing on the image to obtain a preprocessed image. Then, the preprocessed image is compared with the display of the test signal to obtain brightness similarity, contrast similarity, and structural similarity. Based on the brightness similarity, contrast similarity, and structural similarity, a similarity parameter is obtained. If the similarity parameter is greater than a preset threshold, such as greater than or equal to 0.98, the test is considered passed, and the test result is uploaded to the host computer.

[0154] Among them, brightness similarity reflects the human eye's sensitivity to overall changes in brightness and darkness, such as the effect of lighting adjustments on the brightness component. Contrast similarity reflects the degree of dispersion of pixel values, which can be measured by the standard deviation. The higher the contrast, the clearer the image details. Structural similarity covariance reflects the correlation of structural information such as image edges and textures. For example, blurring will reduce structural similarity.

[0155] The similarity parameter ranges from 0 to 1, with a higher value indicating greater similarity, and a value of 1 for a perfect match. In related embodiments, the threshold for the similarity parameter can be set differently. In some cases, the threshold can be set greater than 0.9 to meet the needs of image denoising and video compression scenarios. In other cases, the threshold can be set greater than 0.9 to meet the needs of high-quality scenarios requiring detailed imagery, such as a value of 0.95. In this embodiment, the threshold for the similarity parameter can be set greater than 0.95, for example, 0.98, to improve test quality.

[0156] Continue to refer to Figure 13 As shown, after the test device obtains the first interface signal through the first interface input terminal (USB2.0 / USB3.0), it obtains the audio signal in the first interface signal. In some examples, the audio signal may include PCM (Pulse Code Modulation) audio data. The specific audio parameters of the audio signal are not limited, such as a sampling rate of 48kHz and a bit rate of 24bit, but are not limited to these.

[0157] For the audio signal in the first interface signal, it can be transmitted to an external DAC (Digital Audio Compressor) via I2S bus or similar means for digital-to-analog conversion to generate an analog audio signal. After digital-to-analog conversion, it is combined with the obtained image to obtain an AV signal, HDMI signal, or DP signal, which is then output to the display device under test for audio output via the AV interface, HDMI interface, or DP interface.

[0158] A sampling resistor can be connected in series at the audio output terminal to sample the output audio signal, for example, by acquiring the voltage signal of the audio output to sample the audio signal. The sampled signal can be rectified and filtered to eliminate high-frequency noise, and then converted from analog to digital to obtain audio data such as amplitude and frequency. The obtained amplitude and frequency data are transmitted to the motherboard of the display device under test via SPI bus or other means. The motherboard of the display device under test obtains the audio test result based on whether the amplitude of the obtained audio signal is greater than or equal to a preset amplitude. The obtained audio test result can be uploaded to the host computer.

[0159] Based on the example described above, Figure 14 The diagram shows a schematic of a test system for a display device in a specific example. Figure 14 The example shown illustrates a device under test (DUT) including its motherboard, and a testing device including a test circuit board. Both the DUT motherboard and the test circuit board contain relevant testing software. In the following example, the first interface is a USB interface, the second interface is an HDMI interface, the third interface is a DP interface, and the test object is the DUT's SOC board.

[0160] The motherboard of the display device under test (DUT) may be configured with test signal, audio processing, and image test processing modules. The test signals configured within the DUT may include test images and test audio. The specific test signals can be determined based on the display parameters of the DUT, which include, but are not limited to, resolution (e.g., 2K or 4K) and frequency (e.g., 60Hz or 120Hz). The test signals may be image and audio files containing test images and test audio, such as SMPTE color bars or 4K HDR content, but are not limited to these.

[0161] The hardware components of the test circuit board mainly include a first signal processing module, a switching module, a first compensation module, a second compensation module, a first frequency divider module, a second signal processing module, a second frequency divider module, and a control unit. The host computer is configured with test-related control programs, and the motherboard of the display device under test (DUT) is set with test-related processing programs to complete the transmission of test signals and the processing of test results. In the overall test processing:

[0162] During the testing process, the host computer sends test commands to the display device under test;

[0163] The SOC board of the display device under test receives and compresses the built-in test signal based on the test command from the host computer, and then outputs it through USB 2.0 or USB 3.0.

[0164] The test circuit board receives test images and test audio (first interface signal) via USB 2.0 or USB 3.0. This is converted into two HDMI signals and one AV signal by the first signal processing module. Of the two HDMI signals, one is an 8K 120Hz bandwidth signal (i.e., the second interface signal with the first display parameters, denoted as HDMIA in the relevant embodiments of this application), and the other is a 4K 60Hz bandwidth signal (i.e., the second interface signal with the second display parameters, denoted as HDMIB in the relevant embodiments of this application). The HDMIA signal is output via a switching module. One HDMIA signal output from the switching module is compensated by the first compensation module and then replicated into four HDMIA signals by the first frequency division module. The other HDMIA signal output from the switching module is compensated by the second compensation module and then converted from HDMI to DP by the second signal processing module to generate a DP1.4a signal. The HDMIB signal generated by the first signal processing module is replicated into four HDMIB signals by the second frequency division module. Output 4 HDMIA signals or 4 HDMIB signals, 1 DP signal and 1 AV signal to the motherboard of the display device under test or the SoC of the display device under test.

[0165] The SOC board receives HDMI, DP, and AV signals. Based on the received HDMI, DP, and AV signals, it performs decoding, calculation, storage, and comparison to conduct tests and obtain image test results. It also plays and outputs the audio signals from the HDMI, DP, and AV signals, and monitors and compares the amplitude and frequency of the output audio signals to obtain audio test results. Based on the image and audio test results, test results for the display device under test can be obtained. The test results can be sent to the host computer for display in the relevant test interface.

[0166] The testing system based on the embodiments of this application can realize closed-loop verification of the entire chain from "signal generation → transmission → reception → analysis". It can also analyze test results through the display device under test, achieving pixel-level difference detection, replacing traditional visual inspection, and supporting multiple resolutions, color depths, and HDR formats, covering compatibility testing of mainstream devices.

[0167] Among them, reference Figure 15 As shown, when the host computer participates in the test process control, after the test system is initialized, the host computer can send image test commands to the display device under test (DUT) and the test device. The test device receives the image test commands from the host computer and sets relevant parameters according to the image test commands, such as HDMI output parameters (first display parameters or second display parameters). After the DUT completes the image test process based on the signal output by the test device and obtains the image test results, the DUT can feed back the image test results to the host computer. The host computer can also send audio test commands to the DUT and the test device. After the audio signal output by the display device is returned to the DUT by the test device, the DUT or the test device samples the received audio signal to obtain the audio test results. If the audio test results are normal, the audio test results can be fed back to the host computer. If the audio test results are abnormal, abnormal prompt information can be output, including but not limited to lighting up the fault indicator light, to prompt the test personnel.

[0168] The aforementioned testing process can be integrated into the production management system, for reference. Figure 16 As shown, after the host computer is configured, when the display device under test or the motherboard of the display device under test arrives at the test station, taking the SOC board as an example, the identification code (such as SN (Serial Number)) of the SOC board under test is scanned by the scanning device to determine whether the SOC board under test corresponding to the identification code has passed through the station normally, that is, whether the SOC board under test has passed through the previous processes of the test station normally.

[0169] If the SOC board under test has not passed through a certain process, it can be returned to that process.

[0170] If the station passes normally, the testing process begins. The host computer sends instructions to the SOC board under test to obtain the built-in test signals of the SOC board under test, including but not limited to the built-in test images and test audio, and sends instructions to the test equipment to instruct the test equipment to perform the test parameters.

[0171] After the testing process is completed, the host computer obtains the image test results and audio test results uploaded by the SOC board under test and / or the test device. Based on the image test results and audio test results, it determines whether the test is normal and whether the test of the SOC board under test has passed. If the test passes, it can send a test completion command to the SOC board under test and the test device to indicate that the test of the current SOC board has been completed, and upload the test results (including image test results and audio test results) to the MES system.

[0172] After receiving the test result, MES can transfer the current SOC board under test to the next process and transfer the next SOC board under test to the testing station for testing.

[0173] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0174] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0175] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A testing device for a display device, characterized in that, The testing equipment includes: a first signal processing module, a first frequency division module, and a second frequency division module; The first signal processing module is configured with a first interface input terminal, a second interface first output terminal and a second interface second output terminal. The first interface input terminal is connected to the first interface output terminal of the display device under test, the second interface first output terminal is connected to the first frequency divider module, and the second interface second output terminal is connected to the second frequency divider module. The first signal processing module is configured to: receive a first interface signal output by the display device under test based on a test signal through the first interface signal input terminal; convert the first interface signal into a second interface signal having a first display parameter and a second interface signal having a second display parameter; output the second interface signal having the first display parameter through the first output terminal of the second interface; and output the second interface signal having the second display parameter through the second output terminal of the second interface. The first display parameter and the second display parameter are different, and the first display parameter and the second display parameter include at least one of resolution, refresh rate, and color depth. The first frequency divider module is configured with multiple second interface output ports, which are connected to the second interface input ports of the display device under test. It is configured to divide the received second interface signal with first display parameters into multiple second interface signals and output them through the configured multiple second interface output ports. The second frequency divider module is configured with multiple second interface output ports, which are connected to the second interface input ports of the display device under test. It is configured to divide the received second interface signal with second display parameters into multiple second interface signals and output them through the multiple second interface output ports.

2. The testing equipment according to claim 1, characterized in that, The testing equipment also includes: a switching module and a second signal processing module; The first output terminal of the second interface of the first signal processing module is connected to the first frequency division module through the switch module, the first output terminal of the second interface is connected to the second signal processing module through the switch module, and the output terminal of the second signal processing module is connected to the third interface input port of the display device under test. The switching module is configured to: receive and respond to a control command to enable the connection between the first output terminal of the second interface of the first signal processing module and the first frequency divider module and the second signal processing module. The second signal processing module is configured to convert the received second interface signal with first display parameters into a third interface signal and then output it to the third interface input port of the display device under test.

3. The testing equipment according to claim 2, characterized in that, The testing equipment further includes: a first compensation module and a second compensation module, wherein the first compensation module is connected between the switching module and the first frequency division module, and the second compensation module is connected between the switching module and the second signal processing module; The switch module is configured to receive and respond to a control command to enable the connection between the first output terminal of the second interface and the first compensation module and the second compensation module. The first compensation module is configured to perform signal compensation on the second interface signal with the first display parameter received from the switch module, and output the signal-compensated second interface signal to the first frequency divider module; The second compensation module is configured to perform signal compensation on the second interface signal with the first display parameter received from the switch module, and output the signal-compensated second interface signal to the second signal processing module.

4. The testing equipment according to claim 3, characterized in that, The first compensation module is further configured to acquire the input-output signal difference of the switch module, and to perform signal compensation on the second interface signal with the first display parameter received from the switch module based on the input-output signal difference; The second compensation module is further configured to acquire the input-output signal difference of the switch module, and to perform signal compensation on the second interface signal with the first display parameter received from the switch module based on the input-output signal difference; The input-output signal difference includes the signal of the second interface signal with the first display parameter entering the switch module, and the difference information of the second interface signal with the first display parameter output from the switch module.

5. The testing equipment according to any one of claims 2 to 4, characterized in that, The first signal processing module is further configured with a composite signal output terminal, which is connected to the composite signal input port of the display device under test; The first signal processing module is further configured to convert the first interface signal into a composite signal and output the composite signal to the display device under test through the composite signal output terminal.

6. The testing equipment according to claim 3, characterized in that, The test equipment also includes multiple coupling capacitors, which include at least one of the following: A coupling capacitor is disposed between the first output terminal of the second interface and the switching module; A coupling capacitor is disposed between the switching module and the first compensation module; A coupling capacitor is disposed between the switching module and the second compensation module; A coupling capacitor is disposed between the first compensation module and the first frequency division module; A coupling capacitor is disposed between the second compensation module and the second signal processing module; Coupling capacitors are installed between each output terminal of the first frequency divider module and the second interface input port of the display device under test; A coupling capacitor is disposed between the output terminal of the second signal processing module and the third interface input port of the display device under test; Coupling capacitors are installed between each output terminal of the second frequency divider module and the second interface input port of the display device under test.

7. The testing equipment according to any one of claims 1 to 4, characterized in that, The testing equipment further includes a control unit connected to the first signal processing module; The first signal processing module is configured to receive control commands from the control unit and convert the first interface signal into a second interface signal having a first display parameter, a second interface signal having a second display parameter, and a composite signal.

8. A testing system for a display device, characterized in that, The testing system includes: The display device under test is equipped with a first interface output terminal and multiple second interface input terminals; The test equipment as described in any one of claims 1 to 7; The display device under test is configured to output a first interface signal to the test device through the first interface output terminal based on the locally stored test signal, and receive the signal output by the test device through multiple input ports. Based on the display screen of the test signal and the received signal, the test result of testing the display device under test is determined, wherein the multiple input ports include multiple second interface input terminals.

9. The testing system according to claim 8, characterized in that, The testing system also includes a host computer, which is connected to the display device under test and the display device under test. The display device under test is configured to receive and respond to the control commands of the host computer, and output a first interface signal to the display device under test through the first interface output terminal based on the locally stored test signal; The testing device is configured to receive and respond to control commands from the host computer and configure the display parameters output by the first signal processing module.

10. The testing system according to claim 8 or 9, characterized in that: The display device under test is configured to determine the brightness similarity, contrast similarity, and structural similarity between the display screen of the test signal and the display screen of the received signal, and to obtain similarity parameters based on the brightness similarity, contrast similarity, and structural similarity, and to obtain image test results for testing the display device under test based on the similarity parameters.

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