Multifunctional multi-mode display screen production line test box and test method

Abstract

The invention discloses a multifunctional multi-mode production line test box, and belongs to the technical field of vehicle-mounted display screen testing. The test box comprises a video input interface module, a power supply module, a master control module, a serializer module, a coaxial / twisted-pair switching module, a video output interface module and a communication module. According to the test box, DP video source input is converted into GMSL or FPD-Link video streams through MAX96855 and DS90UB943A serializer modules, and automatic switching of a coaxial / twisted-pair output mode is achieved through a master control module. And the control terminal sends an instruction through the communication module for testing. According to the invention, four combined output modes are supported, and various vehicle-mounted display screen interfaces are adapted; the time sequence can be self-defined by software, and the resolution and the refresh rate are configured in real time through a UART / CAN instruction, so that the test efficiency is greatly improved; white balance calibration, pixel detection and touch response verification are automatically executed, manual intervention is reduced, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive display testing technology, specifically a multi-functional, multi-mode display production line testing box. Background Technology

[0002] With the intelligent development of the automotive industry, the application scenarios of in-vehicle displays are constantly expanding, from traditional dashboards to central control entertainment systems, and then to passenger and rear-seat interactive screens, with increasingly stringent functional and performance requirements. As a key step in the production of in-vehicle display modules, the lamination process directly affects the product's optical performance (such as brightness uniformity and color gamut coverage) and reliability (such as vibration resistance and temperature resistance). Therefore, lamination production lines need to be equipped with efficient and precise testing tools to verify core indicators such as display effect, touch response, and resolution adaptability, ensuring that the product meets automotive-grade standards.

[0003] Traditional display production line test boxes only support fixed screen output and cannot dynamically switch display content or adapt to multi-interface displays; they require domain controllers for signal processing, resulting in complex testing processes and poor flexibility; and they do not support multiple communication protocols, making it difficult to meet the needs of industrial testing.

[0004] Publication number (CN222672603U) discloses a test box for a display production line. In this invention, the external power supply is converted by a power module. The production line equipment sends test commands to a signal transceiver via a CAN bus, which then forwards them to the MCU. A temperature sensor monitors the ambient temperature and reports it to the MCU. The MCU parses the commands and, in conjunction with the temperature control power output module, converts the voltage to supply the display screen; it sends image data via I²C, controlling the deserializer to convert it into an LVDS signal to drive the display; it controls the backlight circuit to adjust brightness; and it can actively reduce power through PWM to protect the hardware in high-temperature conditions.

[0005] The aforementioned comparative documents only improved the test content section, lacking multiple video outputs and multiple mode switching, only having a single mode, and lacking remote software control methods. Summary of the Invention

[0006] The present invention aims to provide a display production line test box that supports automatic switching of multiple modes, independent communication control, and custom timing, thereby solving the problems of poor flexibility and limited functionality of traditional equipment.

[0007] To achieve the above objectives, the technical solution adopted by this invention is as follows: a multi-functional, multi-mode display production line test box, comprising a video input interface module, a power supply module, a main control module, a serializer module, a coaxial / twisted pair switching module, a video output interface module, and a communication module; the power supply module is connected to the power supply terminals of the main control module, the serializer module, the coaxial / twisted pair switching module, the video output interface module, and the communication module; the main control module is connected to the serializer module via an I²C bus; the external interface of the video input interface module is connected to a control terminal; the input terminal of the serializer module is connected to the video input interface module, and the output terminal is connected to the coaxial / twisted pair switching module; the input of the coaxial / twisted pair switching module is connected to the serializer module, and the output terminal is connected to the video output interface module; the output terminal of the video output interface module is connected to the vehicle display screen under test; the communication terminal of the communication module is connected to the main control module, and the external interface is connected to the control terminal.

[0008] Furthermore, the control terminal inputs the DP video source to the serializer module through the video input interface module, which converts it into a GMSL or FPD-Link video stream before transmitting it to the coaxial / twisted pair switching module. The main control module outputs a level signal to the coaxial / twisted pair switching module through the ENCH1 pin to control its output mode. The switched video stream is output to the vehicle display screen through the video output interface module. The communication module receives external commands and transmits them to the main control module, and feeds back the device status to the control terminal.

[0009] Furthermore, the production line test box has four output modes: GMSL coaxial output, GMSL twisted pair output, FPD-Link coaxial output, and FPD-Link twisted pair output.

[0010] Furthermore, according to claim 1, the multi-functional multi-mode display production line test box is characterized in that: the power module converts the 5~32V input voltage into the working voltage required by the main control module, video input interface module, serializer module, coaxial / twisted pair switching module, video output interface module, and communication module.

[0011] Furthermore, the control terminal uses a computer or other device capable of outputting DP video signals; the communication module uses CAN or UART communication, controlling the test box via CAN or UART commands to write manufacturing information to external devices, execute debugging commands, and monitor equipment status.

[0012] Furthermore, the main control module configures the serializer parameters and parses and forwards touch data via the I²C bus; at the same time, it controls the power-on sequence of each module and customizes the timing and sequence configuration of the display screen through software. Furthermore, the serializer module includes MAX96855 and DS90UB943A chips, which can convert DP video sources into GMSL or FPD-Link video streams; it supports automatic switching between multiple video inputs and multiple output modes.

[0013] Furthermore, each channel of the coaxial / twisted pair switching module uses two single-pole double-throw RF switch chips, which are controlled by the ENCH1 pin level of the main control module. When the level is high, CH1 is directly connected and combined with CH2 to form a twisted pair output. When the level is low, CH2 is connected to the coaxial output and a 50Ω matching resistor to form a single-ended coaxial output.

[0014] Furthermore, the video output interface module provides a physical interface for coaxial or twisted-pair signals, supporting the lighting of the vehicle display screen, function testing, and timing verification.

[0015] Furthermore, the present invention also provides a testing method based on a multi-functional, multi-mode display production line test box, comprising the following steps: S1: Connect the vehicle display screen under test to the test box via the video output interface module; connect the test box to the control terminal via the video input interface; connect the communication module of the test box to the control terminal via UART or CAN bus; connect to a 5~32V wide voltage power supply and connect to each module.

[0016] S2: The user issues a start command via software. After receiving the command, the main control module controls the power-on of each module according to the preset timing sequence. The serializer module converts the DP video source into a specified GMSL or FPD-Link video stream. The main control module controls the coaxial / twisted pair switching module through the ENCH1 pin, switching the output mode according to the command. The video stream is transmitted to the display screen under test through the video output interface module, and the display screen lights up and displays dynamic images. During the test, the main control module parses the touch data in real time and feeds it back to the PC through the CAN / UART module. The software automatically records the test results and generates a test report, including pass / fail items, timing deviation, color consistency, and other data.

[0017] S3: If an abnormality occurs during testing, the software will automatically record the abnormal status and can issue debugging commands via UART / CAN commands, such as reconfiguring the serializer or resetting the power sequence.

[0018] S4: After the test is completed, the software automatically generates a test report. Users can view historical test records, statistically analyze yield, and troubleshoot common failure modes through the software.

[0019] The technical effects of this invention are as follows: (1) The display production line test box of the present invention can be independent of the domain controller, and can directly light up the vehicle screen and output dynamic images by converting the DP direct input and the serializer independently, thus solving the defect that traditional equipment only supports fixed images; (2) Supports automatic switching of multiple outputs and multiple modes, reducing equipment replacement time and improving efficiency; (3) The software allows for custom screen timing and timing sequences to meet diverse testing needs and is suitable for different testing scenarios. Attached Figure Description

[0020] This manual includes the following figures, which illustrate the following: Figure 1 This is a logic structure diagram of a multi-functional, multi-mode display production line test box according to the present invention. Figure 2 This is the circuit structure diagram of the power supply module; Figure 3 This is a circuit diagram of a coaxial / twisted pair switching module. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. In the present invention, the term "connection" includes both signal transmission and data interaction achieved through wired connections with actual lines and signal transmission and data interaction achieved through wireless connections via wireless transmission technology.

[0022] To make the technical solution of the present invention clearer, the present invention will be explained and illustrated through the following embodiments: like Figure 1 As shown, a multi-functional, multi-mode display production line test box includes a video input interface module, a power supply module, a main control module, a serializer module, a coaxial / twisted pair switching module, a video output interface module, and a communication module, wherein: The power module input is connected to a 5~32V wide voltage source, and the output is connected to the power supply terminals of each module; the main control module is connected to the serializer module via the I²C bus; the serializer module input is connected to a DP video source, and the output is connected to a coaxial / twisted pair switching module; the coaxial / twisted pair switching module input is connected to the serializer module, and the output is connected to the video output interface module; the video output interface module output is connected to the vehicle display screen under test; the communication module communication terminal is connected to the main control module, and the external interface is connected to the control terminal.

[0023] The video input interface module of the production line test box inputs the DP video source from the control terminal to the serializer module, which converts it into a GMSL or FPD-Link video stream before transmitting it to the coaxial / twisted pair switching module. The main control module outputs a level signal to the coaxial / twisted pair switching module through the ENCH1 pin to control its output mode. The switched video stream is output to the display screen under test through the video output interface module. The communication module receives external commands and transmits them to the main control module, and feeds back the device status to the control terminal.

[0024] like Figure 2 As shown, in this embodiment, the test box is powered by a 12V vehicle power supply. The input voltage is output through the power module to meet the requirements of the other modules. It has a multi-stage voltage output structure. The first-stage DC-DC converter converts the input 5~12V voltage to 3.3V voltage and supplies it to the main control module and other modules. The first-stage LDO is designed for CAN communication and can output 5V DC voltage. The Switch module is controlled by the main control module and is used to dynamically control the KL15 ignition signal and Wakeup signal to simulate the timing of the real vehicle power supply.

[0025] The main control module is the system's central hub, coordinating the collaborative work of all modules. It configures the MAX96855 / DS90UB943A serializer via the I2C bus, dynamically adjusting parameters such as resolution, color depth, and transmission rate. It can receive UART commands and generate corresponding video timing sequences in real time. GPIO directly drives MOSFET switches, controlling KL15 / Wakeup to simulate vehicle power status. The serializer module converts the DP video source into automotive-grade high-speed serial signals GMSL or FPD-Link, controlling output mode switching via CAN and UART commands. The main control module converts data read from the serializer into CAN messages and sends them to the display screen.

[0026] like Figure 3 The diagram shows a coaxial / twisted pair module. This module switches the two channels of the serializer's output, either GMSL or FPD-Link, to a specified output mode. Each channel uses two single-pole double-throw RF switch chips. CH1 is directly connected to the outside and forms a twisted pair output with the other channel. CH2 is connected to the coaxial output and a 50Ω coaxial matching resistor to form a single-ended coaxial output. The control pin ENCH1 is connected to the MCU pin. When the main control module outputs a high level, it switches to twisted pair output; when the main control module outputs a low level, it switches to coaxial output.

[0027] The video output interface module outputs coaxial or twisted-pair signals to the vehicle display screen via a connector; the communication module receives external commands, transmits them to the main control module, executes the commands, and feeds back the device status to the control terminal.

[0028] In this invention, the power supply module converts the power supply voltage into the required supply voltage for each component of the test box; the control terminal connects to the display test box to provide DP input; the main control module completes the configuration and communication of the serializer, with a default configuration of FPD-Link coaxial output; the serializer module uses two serializers, MAX96855D and DS90UB943A, to complete the conversion of DP video source to GMSL or FPD-Link video stream; the coaxial / twisted pair switching module switches the two channels of GMSL or FPD-Link output from the serializer to the specified output mode according to the high and low levels output by the main control module; the output interface connects to the display under test; and the control terminal sends commands for testing through the accompanying UART / CAN software.

[0029] The following detailed description of the specific testing process and implementation of the test box of the present invention in four output combination modes is provided through a typical embodiment.

[0030] Connect the test box to a PC with the test software installed via the video input interface. Connect the test box's communication module to the PC via UART or CAN bus. Connect a 12V vehicle power supply to power the test box. Connect the test box's video output interface module to the input interface of the display screen under test.

[0031] The accompanying "Production Line Test Box Control Software" runs on a PC. After startup, the software automatically establishes a communication connection with the test box's main control module via the UART / CAN bus, controlling the power-on of each module according to a preset timing sequence. The software reads the current status of the test box and loads a pre-set test case library. Users can select the output method themselves.

[0032] Combination 1: GMSL coaxial output The user selects the "GMSL" protocol and "coaxial" output mode from the drop-down menu in the software interface. The software sends commands via UART, and the main control module configures the DS90UB943A chip in the serializer module via the I²C bus to operate in GMSL serial mode. The main control module sets its control pin ENCH1 to low level, and all RF switch chips in the coaxial / twisted pair switching module switch the channel to CH2. The video stream is output through the coaxial interface and forms a complete loop with the 50Ω matching resistor.

[0033] The software then issues test commands and test patterns, and the GMSL video stream is transmitted to the display screen via coaxial cable. The operator or camera checks whether the display screen lights up normally, has no screen distortion, and displays correct colors. If the test includes touch functionality, the main control module will simultaneously parse the touch data packets from the serializer and send feedback to the PC software via UART for response verification.

[0034] After the test ends, the software records the test results in this mode and saves them automatically.

[0035] Combination 2: GMSL twisted pair output The user selects the "GMSL" protocol and "twisted pair" output mode from the drop-down menu in the software interface. The software sends commands via UART, and the main control module configures the DS90UB943A chip in the serializer module via the I²C bus to operate in GMSL serial mode. The main control module sets its control pin ENCH1 to a high level, and all RF switch chips in the coaxial / twisted pair switching module switch the channel to CH1. CH1 and CH1 of another channel together form a differential pair, and the video stream is output through the twisted pair interface.

[0036] The subsequent operations are the same.

[0037] Combination 3: FPD-Link coaxial output The user selects the "FPD-Link" protocol and the "coaxial" output mode. The main control module configures the MAX96855 chip in the serializer module via the I²C bus, making it operate in FPD-Link mode. The main control module sets the ENCH1 pin to a low level, and the RFSwitch switches to the CH2 coaxial output.

[0038] The testing procedure is the same as before, but the video stream uses the FPD-Link protocol. This mode is used to test displays that are compatible with the FPD-Link protocol.

[0039] Combination 4: FPD-Link Twisted Pair Output Test The user selects the "FPD-Link" protocol and "twisted pair" output mode. The main control module configures the MAX96855 chip to FPD-Link mode. The main control module sets the ENCH1 pin to high level. Similar to combination two, it switches to twisted pair output mode. Subsequent testing will focus on the performance of the FPD-Link protocol in differential mode.

[0040] This invention replaces multiple traditional single-function testing instruments with a single device, and can seamlessly switch between four mainstream vehicle display interfaces via software commands. It is easy to operate.

[0041] Production line operators only need to connect the cable once to complete all the tests that previously required changing equipment and connecting cables multiple times within minutes, significantly improving efficiency.

[0042] This invention controls the testing process through UART / CAN control commands. The entire process is software-driven, eliminating human error. All test data and results are automatically recorded, facilitating quality traceability and analysis.

[0043] The software-defined timing and test patterns of this invention enable the same device to easily adapt to the testing needs of future new displays, requiring only software upgrades without any hardware modifications.

[0044] The above embodiments fully demonstrate the practicality, advancement, and economy of the present invention, making it highly suitable for large-scale deployment and application in modern automotive display production lines.

[0045] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A multi-functional multi-mode display screen production line test box, characterized in that: The production line test box includes a video input interface module, a power supply module, a main control module, a serializer module, a coaxial / twisted pair switching module, a video output interface module, and a communication module. The power supply module is connected to the power supply terminals of the main control module, the serializer module, the coaxial / twisted pair switching module, the video output interface module, and the communication module. The main control module is connected to the serializer module via an I²C bus. The external interface of the video input interface module is connected to a control terminal. The input terminal of the serializer module is connected to the video input interface module, and its output terminal is connected to the coaxial / twisted pair switching module. The input terminal of the coaxial / twisted pair switching module is connected to the serializer module, and its output terminal is connected to the video output interface module. The output end of the video output interface module is connected to the vehicle display screen under test; the communication end of the communication module is connected to the main control module, and the external interface is connected to the control terminal.

2. The multi-functional multi-mode display production line test box according to claim 1, characterized in that: The control terminal inputs the DP video source to the serializer module through the video input interface module, which converts it into a GMSL or FPD-Link video stream before transmitting it to the coaxial / twisted pair switching module. The main control module outputs a level signal to the coaxial / twisted pair switching module through the ENCH1 pin to control its output mode. The switched video stream is output to the vehicle display screen through the video output interface module. The communication module receives external commands and transmits them to the MCU control module, and feeds back the device status to the control terminal.

3. The multi-functional multi-mode display production line test box according to claim 1, characterized in that: The multi-functional multi-mode display production line test box has four output modes: GMSL coaxial output, GMSL twisted pair output, FPD-Link coaxial output, and FPD-Link twisted pair output.

4. The multi-functional multi-mode display production line test box according to claim 1, characterized in that: The power supply module converts the 5~32V input voltage into the operating voltage required by the main control module, video input interface module, serializer module, coaxial / twisted pair switching module, video output interface module, and communication module.

5. The multi-functional multi-mode display production line test box according to claim 1, characterized in that: The control terminal uses a computer or other device capable of outputting DP video signals; the communication module uses CAN or UART communication to control the test box through CAN or UART commands, write manufacturing information to external devices, execute debugging commands, and monitor the equipment status.

6. The multi-functional multi-mode display production line test box according to claim 1, characterized in that: The main control module configures the serializer parameters and parses and forwards touch data via the I²C bus; the MCU control module controls the power-on sequence of each module and customizes the timing and sequence configuration of the display screen via software.

7. The multi-functional multi-mode display production line test box according to claim 1, characterized in that: The serializer module includes MAX96855 and DS90UB943A chips, which convert DP video sources into GMSL or FPD-Link video streams; it supports automatic switching between multiple video inputs and multiple output modes.

8. The multi-functional multi-mode display production line test box according to claim 1, characterized in that: Each channel of the coaxial / twisted pair switching module uses two single-pole double-throw RF switch chips, which are controlled by the ENCH1 pin level of the main control module. When the level is high, CH1 is directly connected and combined with CH2 to form a twisted pair output. When the level is low, CH2 is connected to the coaxial output and the matching resistor to form a single-ended coaxial output.

9. The multi-functional multi-mode display production line test box according to claim 1, characterized in that: The video output interface module provides a physical interface for coaxial or twisted-pair signals, supporting the lighting of the vehicle display screen, function testing, and timing verification.

10. A testing method based on the multifunctional multimode display production line test box according to any one of claims 1 to 9, characterized in that, The method includes the following steps: S1: Connect the vehicle display screen under test to the test box via the video output interface module; connect the test box to the control terminal via the video input interface; connect the communication module of the test box to the control terminal via UART or CAN bus; and connect to a 5~32V wide voltage power supply. S2: The user issues a start command via software. After receiving the command, the main control module controls each module to power on according to a preset timing sequence. The serializer module converts the DP video source into a specified GMSL or FPD-Link video stream. The MCU controls the coaxial / twisted pair switching module via the ENCH1 pin, switching the output mode according to the command. The video stream is transmitted to the display screen under test via the video output interface module, and the display screen lights up and displays dynamic images. During the test, the main control module parses the touch data in real time and feeds it back to the control terminal via the CAN / UART module. The software automatically records the test results and generates a test report, including pass / fail items, timing deviation, color consistency, and other data. S3: If an abnormality occurs during testing, the software will automatically record the abnormal status and can issue debugging commands via UART / CAN commands, such as reconfiguring the serializer or resetting the power sequence. S4: After the test is completed, the software automatically generates a test report. Users can view historical test records, statistically analyze yield, and troubleshoot common failure modes through the software.

Images