Display screen production line test box

Abstract

The utility model discloses a display screen production line test box, and belongs to the technical field of display screens. The test box comprises a power supply module, a microcontroller, a temperature sensor, a signal transceiver, a power supply output module, a deserializer and a backlight control circuit, the test box is respectively connected with the production line test equipment, the power supply and the display screen, and the power supply is connected with the power supply module; the power supply module supplies power to each component of the test box; the signal transceiver is respectively connected with the production line test equipment and the microcontroller; the temperature sensor is connected with the microcontroller; the power supply output module is respectively connected with the display screen and the microcontroller; the deserializer is respectively connected with the display screen and the microcontroller; and the backlight control circuit is respectively connected with the display screen and the microcontroller. According to the utility model, the display screen on the production line can be efficiently and accurately detected through the test box, and the test box can be repeatedly used.

Description

Technical Field

[0001] The utility model belongs to the technical field of display screens, and specifically relates to a display screen production line test box. Background Art

[0002] With the continuous development of the automobile industry, in-vehicle displays are increasingly used in modern cars. These displays are usually bonded to the vehicle's control panel or dashboard to provide vehicle information and interactive functions. The bonding process is critical to the performance and reliability of the display, so the bonded screen needs to be tested during the production process.

[0003] The application of test tools on the bonding line plays a key role in the detection of the bonding process. These tools can verify the display effect, resolution, color accuracy and other key performance indicators of the display. By promptly discovering and repairing potential problems, the test tools on the production line can ensure that the quality of the display meets the standards and improve the reliability of the entire automotive system and user experience.

[0004] At the same time, the test tools on the bonding line also have the advantages of high efficiency and repeatability. The automated equipment can quickly switch between different test patterns, perform multiple tests on the display, and record key test results. This not only improves production efficiency, but also ensures the consistency and accuracy of the test. At the same time, it helps to improve production efficiency, reduce defective product rates, and ensure the quality and reliability of automotive displays.

[0005] Publication No. (CN117348757A) discloses a display screen touch test method, device, equipment and storage medium. The present invention sends track coordinate point information to a CAN analysis module, converts information through the CAN analysis module, obtains a conversion coordinate signal, sends the conversion coordinate signal to a slide rail control module through an MCU to control the movement of the slide rail control module; sends a photo command to a camera, obtains a target track image corresponding to the incubator display screen through the camera according to the photo command; performs track comparison according to the target track image, and completes the touch test of the incubator display screen according to the comparison result.

[0006] The above-mentioned reference document only tests the touch function of the display screen, and lacks the detection of the quality of the display screen itself. Different from the reference document, the test box of the utility model has made targeted improvements to the display screen production line, and can perform multiple tests on the backlight and color of the display screen after pasting. At the same time, considering the influence of the ambient temperature during the high-temperature aging test of the display screen, the test box of the utility model can interact adaptively with the ambient temperature. Utility Model Content

[0007] The utility model aims to overcome the deficiencies of the prior art and proposes a display screen production line test box, so as to achieve the purpose of realizing efficient and accurate detection of display screens on the production line through the test box, and the test box can be reused.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a display production line test box, the test box includes a power module, a microcontroller, a temperature sensor, a signal transceiver, a power output module, a deserializer, and a backlight control circuit, wherein:

[0009] The test box is respectively connected to the production line test equipment, power supply, and display screen. Specifically, the power supply is connected to the power supply module; the power supply module is respectively connected to the microcontroller, temperature sensor, signal transceiver, power output module, deserializer, and backlight control circuit; the signal transceiver is respectively connected to the production line test equipment and the microcontroller; the temperature sensor is connected to the microcontroller; the power output module is respectively connected to the display screen and the microcontroller; the deserializer is respectively connected to the display screen and the microcontroller; the backlight control circuit is respectively connected to the display screen and the microcontroller.

[0010] Furthermore, the microcontroller includes an analog / digital converter, a PWM controller, a universal input / output interface, a first bus interface, and a second bus interface, wherein: the analog / digital converter is respectively connected to the power module and the temperature sensor; the first bus interface is connected to the signal transceiver; the universal input / output interface is respectively connected to the backlight control circuit, the power output module, and the deserializer; and the second bus interface is connected to the deserializer.

[0011] Furthermore, the production line test equipment is connected to the signal transceiver via a CAN bus. Correspondingly, the signal transceiver is a CAN transceiver, and the first bus interface is a CAN bus interface.

[0012] Further, the second bus interface is connected to the deserializer via an I2C bus, and correspondingly, the second bus interface is an I2C bus interface.

[0013] Furthermore, the microcontroller includes a memory, in which picture or video data for testing is pre-stored, and the model of the microcontroller is Cypress Traveo II.

[0014] Furthermore, the power module includes a transformer, and the transformer is respectively connected to the power supply, the microcontroller, the temperature sensor, the signal transceiver, the power output module, the deserializer, and the backlight control circuit.

[0015] Furthermore, the power supply module is used to convert the power supply voltage into the power supply voltage required by each component of the test box.

[0016] The temperature sensor is used to detect the ambient temperature of the display production line and transmit the temperature signal to the microcontroller;

[0017] The signal transceiver is used to receive the test command sent by the production line test equipment and forward it to the microcontroller;

[0018] The microcontroller is used to output corresponding control signals to the power output module, deserializer, backlight control circuit, and display screen after analyzing and processing the received test command and temperature signal;

[0019] The power output module is used to convert the voltage of the power supply into the power supply voltage of the display screen according to the control signal, and output it to the display screen;

[0020] The deserializer is used to convert the corresponding test data into LVDS signals according to the control signal and then output them to the display screen;

[0021] The backlight control circuit is used for outputting a corresponding backlight control signal to the display screen according to the control signal.

[0022] The technical effects of the utility model are as follows: (1) the utility model can be applied to the display screen aging and bonding production line to meet the corresponding testing requirements; (2) the test box can preset a variety of test pictures or videos, which can be called up as needed during testing, thereby reducing labor input and having a high degree of intelligence; (3) for high-temperature aging, the test box can adjust the test parameters of the display screen according to temperature changes; (4) the test box can be reused and is suitable for a variety of display screens. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the structure of a test box according to an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the specific implementation of the utility model through the description of the embodiments with reference to the accompanying drawings, with the purpose of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution of the utility model and to facilitate its implementation. In the utility model, the "connection" includes both signal transmission and data interaction achieved by wired connection with actual lines, and signal transmission and data interaction achieved by wireless connection achieved by wireless transmission technology.

[0025] In order to make the technical solution of the utility model clearer, the utility model is explained through the following embodiments:

[0026] A display production line test box, such as Figure 1 As shown, the test box includes a power module, a microcontroller (MCU), a temperature sensor, a signal transceiver, a power output module, a deserializer, and a backlight control circuit, wherein:

[0027] The test box is respectively connected to the production line test equipment, power supply, and display screen. Specifically, the power supply is connected to the power supply module; the power supply module is respectively connected to the microcontroller, temperature sensor, signal transceiver, power output module, deserializer, and backlight control circuit; the signal transceiver is respectively connected to the production line test equipment and the microcontroller; the temperature sensor is connected to the microcontroller; the power output module is respectively connected to the display screen and the microcontroller; the deserializer is respectively connected to the display screen and the microcontroller; the backlight control circuit is respectively connected to the display screen and the microcontroller.

[0028] In this embodiment, the power supply simulates the vehicle environment to provide the test box with the power supply voltage of KL30, and the power module of the test box converts the KL30 power supply voltage into the power supply voltage required by each component in the test box to ensure that each component is under normal working voltage. The power module includes a transformer, and the transformer is respectively connected to the power supply, microcontroller, temperature sensor, signal transceiver, power output module, deserializer, and backlight control circuit. In specific implementation, the production line test equipment may include a power supply, or a separate power supply may be set outside the production line test equipment; the microcontroller model is Cypress TraveoII, which is a MCU (microcontroller) with complete functions and strong scalability. Based on this, this test box can be expanded with other test modules for display screen testing needs.

[0029] Furthermore, the microcontroller includes an analog / digital converter (ADC), a PWM controller, a general input / output interface (GPIO), a first bus interface, and a second bus interface, wherein: the analog / digital converter is respectively connected to the power module and the temperature sensor; the first bus interface is connected to the signal transceiver; the general input / output interface is respectively connected to the backlight control circuit, the power output module, and the deserializer; and the second bus interface is connected to the deserializer. Further, the microcontroller includes a memory, in which pictures or video data for testing are pre-stored. The microcontroller controls the deserializer to output preset customized pictures such as black, white, red, green, blue, grayscale, checkerboard, and color bars as needed, which reduces the input of labor and improves the degree of intelligence.

[0030] Specifically, in this embodiment, the production line test equipment and the signal transceiver are connected via a CAN bus. Correspondingly, the signal transceiver adopts a CAN transceiver, and the first bus interface is a CAN bus interface. The CAN bus is widely used in vehicle-mounted systems. The use of the CAN bus can more accurately simulate the environment of the vehicle display screen and save wiring harnesses. In specific implementation, the technician controls the production line test equipment to send a test command containing the display screen function to be tested and the corresponding parameters. The test command is transmitted to the CAN transceiver via the CAN bus, and the CAN transceiver processes and then forwards it to the microcontroller.

[0031] The test box is provided with a temperature sensor, which can detect the ambient temperature of the display production line in real time and send it to the microcontroller. The microcontroller converts it into a signal that the microcontroller can recognize through an analog-to-digital converter and then analyzes it. Especially during the high-temperature aging test of the display, the test box needs to adjust the display test parameters according to the temperature. In this embodiment, the microcontroller analyzes the converted temperature signal. First, the PWM controller can output PWM signals with different duty cycles according to the temperature signal. During the high-temperature aging test of the display, as the temperature rises, the power of each component of the microcontroller will be actively reduced to avoid hardware damage caused by high temperature and high current, which reflects the Derating (reducing rated power) strategy; secondly, after the microcontroller analyzes the temperature signal, it outputs the corresponding control signal to the backlight control circuit. The backlight control circuit can adjust the backlight brightness of the display according to the control signal to ensure that the backlight works stably for a long time and ensure the accuracy and efficiency of the display test. The specific backlight control circuit is a commonly used structure in the prior art and will not be described in detail in the utility model.

[0032] In the utility model, the analog-to-digital converter collects the temperature signal of the temperature sensor and also collects the KL30 voltage signal of the power supply. At this time, the power module does not perform voltage conversion on the KL30 voltage. After the microcontroller converts the voltage signal into a corresponding digital signal, it can be fed back to the host computer for verification of the function and performance of the test box, thereby ensuring efficient and accurate testing of the test box.

[0033] Further, in the present embodiment, the deserializer is an LVDS deserializer, and the second bus interface of the microcontroller is connected to the LVDS deserializer through the I2C bus. Correspondingly, the second bus interface is an I2C bus interface; the LVDS deserializer is also connected to the general input and output interface of the MCU to receive the IO signal of the MCU, which can pull up or pull down the level signal to control the LVDS deserializer. After the microcontroller parses the test command of the CAN bus, it determines the function and test parameters that the display screen needs to test, mainly including the test data and test commands such as pictures or videos that need to be displayed on the display screen, and the microcontroller packages the above data and sends it to the deserializer through the I2C bus. The deserializer then converts it into an LVDS signal (low voltage differential signal) in combination with the control signal of the MCU and sends it to the display screen for testing. The MCU control signal received by the deserializer includes the IO signal output by the GPIO and the control command transmitted in the I2C bus. The I2C bus has high data transmission efficiency, strong anti-interference ability, high data security, simple wiring harness, and wide application. It is the preferred solution of the utility model and can be replaced during actual implementation.

[0034] When the display screen is tested, the KL30 power supply voltage of the power supply cannot be directly used when it is powered on, so a power output module is set in this test box to convert the KL30 power supply voltage into a voltage that can be used by the display screen, ensuring the accuracy and efficiency of the test. The power supply voltage requirements of different display screens may be different, and the power output module should be set with a variety of voltage conversion schemes. The specific conversion method is a prior art and will not be repeated in this utility model.

[0035] Furthermore, in the utility model, the power module is used to convert the power supply voltage into the power supply voltage required by the components of the test box; the temperature sensor is used to detect the ambient temperature of the display production line and transmit the temperature signal to the microcontroller; the signal transceiver is used to receive the test command sent by the production line test equipment and forward it to the microcontroller; the microcontroller is used to analyze and process the received test command and temperature signal, and then output the corresponding control signal to the power output module, deserializer, backlight control circuit, and display screen; the power output module is used to convert the power supply voltage into the power supply voltage of the display screen according to the control signal, and output it to the display screen; the deserializer is used to convert the corresponding test data into LVDS signals according to the control signal and output it to the display screen, and the display screen outputs the test image according to the LVDS signal; the backlight control circuit is used to output the corresponding backlight control signal to the display screen according to the control signal.

[0036] In summary, the test box of the utility model realizes accurate and efficient display screen testing, and can be applied to display screen aging and bonding production lines to meet corresponding testing requirements; for high-temperature aging, the test box can adjust the test parameters of the display screen according to temperature changes, and can actively reduce power to protect the various structures of the test box; obviously, the test box is reusable, and the test module can be expanded according to needs, and is suitable for a variety of display screens.

[0037] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A display production line test box, characterized in that: The test box includes a power module, a microcontroller, a temperature sensor, a signal transceiver, a power output module, a deserializer, and a backlight control circuit, wherein: The test box is respectively connected to the production line test equipment, power supply, and display screen. Specifically, the power supply is connected to the power supply module; the power supply module is respectively connected to the microcontroller, temperature sensor, signal transceiver, power output module, deserializer, and backlight control circuit; the signal transceiver is respectively connected to the production line test equipment and the microcontroller; the temperature sensor is connected to the microcontroller; the power output module is respectively connected to the display screen and the microcontroller; the deserializer is respectively connected to the display screen and the microcontroller; the backlight control circuit is respectively connected to the display screen and the microcontroller.

2. A display production line test box according to claim 1, characterized in that: The microcontroller includes an analog / digital converter, a PWM controller, a universal input / output interface, a first bus interface, and a second bus interface, wherein: the analog / digital converter is respectively connected to the power module and the temperature sensor; the first bus interface is connected to the signal transceiver; the universal input / output interface is respectively connected to the backlight control circuit, the power output module, and the deserializer; and the second bus interface is connected to the deserializer.

3. A display production line test box according to claim 2, characterized in that: The production line test equipment is connected to the signal transceiver via a CAN bus. Correspondingly, the signal transceiver is a CAN transceiver, and the first bus interface is a CAN bus interface.

4. A display production line test box according to claim 2 or 3, characterized in that: The second bus interface is connected to the deserializer via an I2C bus. Correspondingly, the second bus interface is an I2C bus interface.

5. The display screen production line test box according to claim 2, characterized in that: The microcontroller comprises a memory, in which picture or video data for testing is pre-stored, and the model of the microcontroller is CypressTraveo II.

6. A display production line test box according to claim 1 or 2, characterized in that: The power module comprises a transformer, and the transformer is respectively connected to the power supply, the microcontroller, the temperature sensor, the signal transceiver, the power output module, the deserializer, and the backlight control circuit.

7. The display screen production line test box according to claim 1, characterized in that: The power supply module is used to convert the power supply voltage into the power supply voltage required by each component of the test box; The temperature sensor is used to detect the ambient temperature of the display production line and transmit the temperature signal to the microcontroller; The signal transceiver is used to receive the test command sent by the production line test equipment and forward it to the microcontroller; The microcontroller is used to output corresponding control signals to the power output module, deserializer, backlight control circuit, and display screen after analyzing and processing the received test command and temperature signal; The power output module is used to convert the voltage of the power supply into the power supply voltage of the display screen according to the control signal, and output it to the display screen; The deserializer is used to convert the corresponding test data into LVDS signals according to the control signal and then output them to the display screen; The backlight control circuit is used for outputting a corresponding backlight control signal to the display screen according to the control signal.

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