Display drive control system, display drive control method and display device

Abstract

The invention provides a display driving control system and method and a display device.The display driving control system comprises a signal source, a signal conversion module, a display driving module and a detection switching module, and the signal conversion module comprises a plurality of signal conversion units and is electrically connected with the signal source; the display driving module receives a low-voltage differential signal output by a signal conversion unit and generates a display driving signal. The detection switching module carries out fault detection on the signal conversion unit electrically connected between the signal source and the display driving module, and when the signal conversion unit electrically connected between the signal source and the display driving module breaks down, the signal conversion unit is switched to the display driving module. A signal conversion unit electrically connected between a signal source and a display driving module is switched to another signal conversion unit at a blanking interval of a current display frame of the display panel, so that the other signal conversion unit continues to provide a low-voltage differential signal for generating a display driving signal for the display driving module; the display panel can perform continuous display, and the problem of black screen display is solved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically to a display driving control system and method, and a display device. Background Technology

[0002] Due to factors such as temperature and vibration, the display driver system controlling the display panel may experience malfunctions, such as failures or poor soldering, leading to a black screen. For example, in automotive screen applications, drastic temperature changes can cause component performance degradation and failure; frequent vehicle vibrations can loosen solder joints, resulting in poor soldering. These malfunctions often disrupt the normal operation of the display driver system, causing a black screen. This not only severely impacts the driver's access to vehicle information but also poses a potential threat to driving safety. Existing display driver control systems lack effective mechanisms to address such malfunctions, making it difficult to guarantee continuous and stable display. Therefore, an innovative solution to address these problems is urgently needed. Summary of the Invention

[0003] This invention provides a display driving control system and method, and a display device, which can reduce the probability of black screen problems in display devices.

[0004] This invention provides a display driving control system, including a signal source, a signal conversion module, a display driving module, and a detection and switching module. The signal source is configured to output a display interface signal. The signal conversion module includes multiple signal conversion units and is electrically connected to the signal source. The signal conversion module is configured to generate a low-voltage differential signal based on the display interface signal. The display driving module is electrically connected to the signal conversion module and is configured to receive the low-voltage differential signal output by one of the signal conversion units to generate a display driving signal to control the display panel to display. The detection and switching module is configured to perform fault detection on the signal conversion unit electrically connected between the signal source and the display driving module. When a fault occurs in the signal conversion unit electrically connected between the signal source and the display driving module, the module switches the signal conversion unit electrically connected between the signal source and the display driving module to another signal conversion unit during the blanking interval of the current display frame of the display panel.

[0005] This invention also provides a display driving control method. The display driving control method uses any of the above-mentioned display driving control systems to control the display panel for display. The display driving control method includes: generating a display driving signal based on a low-voltage differential signal to control the display panel for display; and during the display panel display process, performing fault detection on the signal conversion unit that generates the low-voltage differential signal, and when the signal conversion unit malfunctions, switching the signal conversion unit electrically connected between the signal source and the display driving module to another signal conversion unit during the blanking interval.

[0006] This invention also provides a display device, which includes any of the above-described display driving control systems and a display panel. The display panel is electrically connected to the display driving control system and is configured to display according to the display driving signal output by the display driving control system.

[0007] Embodiments of the present invention provide a display driving control system and method, and a display device. By utilizing a detection switching module to detect faults in signal conversion units electrically connected between a signal source and a display driving module, and when a fault occurs in the signal conversion unit, the system switches the signal conversion unit to another signal conversion unit during the blanking interval of the current display frame on the display panel. This allows the other signal conversion unit to continue providing the display driving module with a low-voltage differential signal to generate the display driving signal, thereby enabling continuous output of the display driving signal to the display panel and achieving continuous display control, thus improving the problem of black screen display. Furthermore, since the blanking interval is relatively short based on human visual parameters, switching another signal conversion unit in the signal conversion module to be electrically connected to the display driving module during the blanking interval of the current display frame reduces the probability of the human eye perceiving the screen transition caused by the signal conversion unit switching, achieving a seamless switching setting. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figures 1A to 1E This is a schematic block diagram of the display driving control system provided in an embodiment of the present invention;

[0010] Figure 2 This is a flowchart of the display driver control method provided in an embodiment of the present invention;

[0011] Figure 3 This is a schematic diagram of the structure of the display device provided in an embodiment of the present invention. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0013] Specifically, such as Figures 1A to 1E This is a schematic block diagram of the display driving control system provided in an embodiment of the present invention. The present invention provides a display driving control system 10, which includes a signal source 11, a signal conversion module 12, a display driving module 13, and a detection and switching module 14.

[0014] Signal source 11 is configured to output display interface signals.

[0015] The display interface signal can be an Embedded Display Port (EDP) signal. The display interface signal can be a structured data packet containing the complete video transmission standard, including the physical layer, link layer, and protocol layer, for efficient transmission of video, audio, and control signals.

[0016] Optionally, the signal source 11 can be at least one of a graphics processor and a main control SOC (System on Chip).

[0017] The signal conversion module 12 includes multiple signal conversion units 121 and is electrically connected to the signal source 11. The signal conversion module 12 is configured to generate a low-voltage differential signal (LVDS) based on the display interface signal.

[0018] The low-voltage differential signal includes pixel data information and clock information. The pixel data signal corresponds to the content actually displayed on the display panel 20, and the clock information corresponds to the time nodes such as frame scanning, line scanning, and data sampling of the display panel 20.

[0019] The process by which the signal conversion module 12 generates multiple low-voltage differential signals based on the display interface signals is a process of protocol layer reconstruction and electrical characteristic adaptation. This process may include steps such as display interface signal decoding, protocol parsing and data extraction, pixel mapping and timing reconstruction, and low-voltage differential signal encoding and driving. Display interface signal decoding restores the display interface signals from high-speed serial signals to parallel data. Protocol parsing and data extraction deconstruct the display interface signals to extract valid pixel data information. Pixel mapping and timing reconstruction are operations performed to adapt the resolution of the display panel 20 and the timing of the low-voltage differential signals. Low-voltage differential signal encoding and driving are operations performed to convert parallel data into low-voltage differential signals.

[0020] In some embodiments, the signal conversion module 12 may be a signal processor.

[0021] In some embodiments, the signal conversion module 12 may include a plurality of bridging chips, any one of which may serve as a signal conversion unit 121.

[0022] The display driver module 13 is electrically connected to the signal conversion module 12. The display driver module 13 is configured to receive a low-voltage differential signal output by a signal conversion unit 121 to generate a display driver signal to control the display panel 20 to display.

[0023] The display driving control signals include data signals transmitted to each sub-pixel within the display panel 20, and scanning signals controlling the sub-pixels to refresh and display data. In some embodiments, the display driving module 13 may be a display driving chip that controls the display on the display panel 20.

[0024] In some embodiments, the display driver control signal may further include touch scanning signals that control the display panel 20 to implement touch functionality. In some embodiments, the display driver module 13 may be a Touch and Display Driver Integration (TDDI) chip.

[0025] The display panel 20 includes multiple sub-pixels for display purposes, and a display drive control signal can control these sub-pixels to display an image. It is understood that the display panel 20 includes at least one of a passive light-emitting display panel and an active light-emitting display panel. Passive light-emitting display panels include liquid crystal display panels, etc., while active light-emitting display panels include display panels that use at least one of organic light-emitting diodes, sub-millimeter light-emitting diodes, and micro light-emitting diodes as light-emitting devices.

[0026] The detection switching module 14 is configured to perform fault detection on the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13, and when the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13 fails, it switches the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13 to another signal conversion unit 121 during the blanking interval of the current display frame of the display panel 20.

[0027] The blanking interval includes at least one of a horizontal blanking interval and a vertical blanking interval, and the current display frame can refer to the frame that the display panel 20 is currently displaying. When the signal conversion unit 121 switches based on the horizontal blanking interval, the blanking interval of the current display frame can be the interval between the refresh data of adjacent row sub-pixels in the frame that the display panel 20 is currently displaying. When the signal conversion unit 121 switches based on the vertical blanking interval, since the vertical blanking interval between the current display frame and the previous frame is not traceable, the blanking interval of the current display frame can refer to the vertical blanking interval between the frame that the display panel 20 is currently displaying and the frame located after the current display frame.

[0028] To facilitate understanding of this application, the example given is a signal conversion module 12 comprising two signal conversion units 121.

[0029] Please continue reading. Figure 1B The signal conversion module 12 includes a first signal conversion unit 1211 and a second signal conversion unit 1212. The first signal conversion unit 1211 is electrically connected between the signal source 11 and the display driver module 13. The display interface signal output from the signal source 11 is converted into a low-voltage differential signal by the first signal conversion unit 1211 and output to the display driver module 13. The display driver module 13 converts the low-voltage differential signal into a display driver signal so that the display panel 20 can display according to the display driver signal. During the operation of the signal source 11, the first conversion unit, the display driver module 13, and the display panel 20, the detection switching module 14 can continuously perform fault detection on the first signal conversion unit 1211, which is electrically connected between the signal source 11 and the display driver module 13. When the detection switching module 14 detects a fault in the first signal conversion unit 1211, it switches the first signal conversion unit 1211, which is electrically connected between the signal source 11 and the display driver module 13, to the second signal conversion unit 1212 during the blanking interval of the current display frame. This removes the first signal conversion unit 1211 from the electrical connection path between the signal source 11 and the display driver module 13, and allows the second signal conversion unit 1212 to be connected to the electrical connection path between the signal source 11 and the display driver module 13. Figure 1CAs shown. Furthermore, after the second signal conversion unit 1212 is connected between the signal source 11 and the display driver module 13, the display interface signal output by the signal source 11 is converted into a low-voltage differential signal by the second signal conversion unit 1212 and output to the display driver module 13. The display driver module 13 converts the low-voltage differential signal into a display driver signal so that the display panel 20 displays according to the display driver signal.

[0030] Similarly, the detection switching module 14 can also continuously detect faults in the second signal conversion unit 1212 that is electrically connected between the signal source 11 and the display driver module 13, and when a fault is detected in the second signal conversion unit 1212, the second signal conversion unit 1212 that is electrically connected between the signal source 11 and the display driver module 13 is switched to another signal conversion unit 121 during the blanking interval of the current display frame.

[0031] In some embodiments, a bridging chip is used as the signal conversion unit 121. Accordingly, the first signal conversion unit 1211 includes a first bridging chip, and the second signal conversion unit 1212 includes a second bridging chip. The first and second bridging chips are respectively connected between the detection switching module 14 and the display driver module 13, so that the detection switching module 14 enables one of the first and second bridging chips to receive a display interface signal. In other embodiments, the first and second bridging chips are respectively connected between the signal source 11 and the detection switching module 14, so that the detection switching module 14 enables one of the first and second bridging chips to output a low-voltage differential signal to the display driver module 13.

[0032] The display driving control system 10 provided in this application embodiment is equipped with a detection switching module 14, which performs fault detection on the signal conversion unit 121 electrically connected between the signal source 11 and the display driving module 13. When the signal conversion unit 121 electrically connected between the signal source 11 and the display driving module 13 fails, the signal conversion unit 121 is switched to another signal conversion unit 121 to continue providing the display driving module 13 with a low-voltage differential signal to generate the display driving signal. This allows the display driving signal to be continuously output to the display panel 20, realizing continuous display control of the display panel 20 and improving the problem of black screen display.

[0033] Furthermore, since the blanking interval is determined based on human visual parameters and is relatively small, switching the signal conversion module 12 within the blanking interval of the current display frame can still make the screen display appear continuous, reducing the probability of the human eye perceiving the display difference caused by the switching of the signal conversion unit 121, and achieving seamless switching settings.

[0034] Because the duration of the horizontal blanking interval is significantly shorter than that of the vertical blanking interval, and the horizontal blanking interval is distributed throughout the duration of the current display frame, switching the signal conversion unit 121 within the horizontal blanking interval places higher demands on the display control system. Furthermore, switching the signal conversion unit 121 may cause inconsistencies in screen brightness. Therefore, to reduce the perceived screen display problems caused by the switching of the signal conversion unit 121 and to lower the requirements on the display drive control system 10, switching the signal conversion unit 121 can be implemented within the vertical blanking interval.

[0035] In some embodiments, the display driver module 13 is further configured to output a synchronization enable signal TE. The display driver module 13 reports to the signal source 11 via a level transition of the synchronization enable signal TE that the display panel 20 is about to begin displaying the next frame, causing the signal source 11 to update the display interface signal within the vertical blanking interval. After the display driver module 13 completes receiving the updated display interface signal, the level of the synchronization enable signal TE transitions again. Therefore, the synchronization enable signal can be used to coordinate the synchronization settings of the output of the signal source 11 and the display refresh of the display panel 20, and the synchronization enable signal TE can characterize the information of the vertical blanking interval. Therefore, the timing of the vertical blanking interval can be locked using the synchronization enable signal TE output by the display driver module 13 to control the switching period of the signal conversion unit 121.

[0036] In some embodiments, the time interval between the falling edge and rising edge of the synchronization enable signal TE is aligned with the vertical blanking interval. That is, the falling edge of the synchronization enable signal TE marks the start of the vertical blanking interval, and the rising edge of the synchronization enable signal TE marks the end of the vertical blanking interval. When the synchronization enable signal TE transitions from a high level to a low level, a falling edge appears. When the signal source 11 detects the falling edge of the synchronization enable signal TE, the signal source 11 outputs an updated display interface signal to the display driver module 13. After the display driver module 13 completes the reception of the updated display interface signal, the synchronization enable signal TE transitions from a low level to a high level, and a rising edge appears. After that, the display panel 20 begins to display with the updated display interface signal.

[0037] The vertical blanking interval can be easily determined by using the synchronization enable signal TE output by the display driver module 13. This allows the detection switching module 14 to switch the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13 to another signal conversion unit 121 during the vertical blanking interval, thereby improving the convenience of switching the signal conversion unit 121.

[0038] For ease of understanding, the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13 is referred to as the target signal conversion unit 121A. The signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13 when the target signal conversion unit 121A fails is referred to as the backup signal conversion unit 121B. All other signal conversion units 121 besides the target signal conversion unit 121A and the backup signal conversion unit 121B are referred to as redundant signal conversion units. It should be understood that the signal conversion module 12 can choose to include or exclude redundant signal conversion units as needed.

[0039] In some embodiments, the detection switching module 14 may also be configured to detect the operating duration of the target signal conversion unit 121A, so that when the operating duration of the target signal conversion unit 121A is longer than a preset duration, the signal conversion unit 121 electrically connected between the signal source 11 and the display driving module 13 is switched to a backup signal conversion unit 121B, so that multiple signal conversion units 121 are switched at preset intervals, thereby allowing multiple signal conversion units 121 to be used in turn, thus delaying the aging cycle of each signal conversion unit 121.

[0040] It should be noted that the electrical connection mentioned in this application may include a connection implemented in a wired or wireless manner.

[0041] Please continue reading. Figures 1D to 1E , Figure 1D and Figure 1E The dashed line connecting the signal conversion unit in the middle indicates that the signal conversion unit 121 is not electrically connected to the signal source 11 and the display driver module 13 at the same time.

[0042] The detection switching module 14 may include a detection unit 141 and a switching unit 142.

[0043] The detection unit 141 is configured to perform fault detection on the target signal conversion unit 121A and generate a switching control signal when a fault occurs in the target signal conversion unit 121A.

[0044] In some embodiments, to ensure that the detection results more accurately reflect the fault state of the target signal conversion unit 121A, the link status of the signal transmission link between the signal source 11 and the display driver module 13 can be detected based on at least one of the physical layer and the protocol layer, thereby achieving fault detection of the target signal conversion unit 121A. That is, when the link status of the signal transmission link between the signal source 11 and the display driver module 13 is abnormal, it can be determined that the target signal conversion unit 121A has failed.

[0045] Accordingly, the detection unit 141 is configured to detect the link status of the signal transmission link between the signal source 11 and the display driver module 13, and generate a switching control signal when the link status is abnormal.

[0046] The signal transmission link between the signal source 11 and the display driver module 13 refers to the complete signal transmission path from the signal source 11 to the display driver module 13. This signal transmission link may include physical connections, electrical characteristics, and protocol interactions. The signal transmission link includes the target link from the signal source 11 to the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13, and the main link from the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13 to the display driver module 13. In other words, the signal transmission link includes the target link between the signal source 11 and the target signal conversion unit 121A, and the main link between the target signal conversion unit 121A and the display driver module 13.

[0047] Link status includes the target link status of the target link and the main link status of the main link. If at least one of the target link status and the main link status is abnormal, the link status is determined to be abnormal.

[0048] The switching unit 142 is electrically connected to the detection unit 141. The switching unit 142 is configured to switch the signal conversion unit 121, which is electrically connected between the signal source 11 and the display driver module 13, to another signal conversion unit 121 during the blanking interval of the current display frame, according to the switching control signal.

[0049] That is, the switching unit 142 can switch the target signal conversion unit 121A to the backup signal conversion unit 121B according to the blanking interval of the switching control signal in the current display frame, so that the backup signal conversion unit 121B becomes the new target signal conversion unit 121A, while the original target signal conversion unit 121A becomes the backup signal conversion unit 121B or the redundant signal conversion unit.

[0050] In some embodiments, the switching unit 142 is configured to switch the signal conversion unit electrically connected between the signal source 11 and the display driving module 13 to another signal conversion unit according to a switching control signal during the vertical blanking interval of the current display frame. In other embodiments, the switching unit 142 is configured to switch the signal conversion unit electrically connected between the signal source 11 and the display driving module 13 to another signal conversion unit according to a switching control signal during the horizontal blanking interval of the current display frame.

[0051] Optionally, the switching unit 142 can be connected between the signal source 11 and the signal conversion module 12, or the switching unit 142 can be connected between the signal conversion module 12 and the display driver module 13.

[0052] It is understandable that although the signal conversion module 12 includes multiple signal conversion units 121, only one signal conversion unit 121 participates in the signal conversion from the display interface signal to the low-voltage differential signal between the signal source 11 and the display driver module 13. Therefore, when the switching unit 142 is connected between the signal source 11 and the signal conversion module 12, the target signal conversion unit 121A is electrically connected between the signal source 11 and the display driver module 13, while the redundant signal conversion unit and the backup signal conversion unit 121B are not electrically connected to the signal source 11 due to the presence of the switching unit 142. Thus, the target signal conversion unit 121A can receive the display interface signal and generate a low-voltage differential signal to output to the display driver module 13. The display interface signal output by the signal source 11 may not be received by the redundant signal conversion unit and the backup signal conversion unit 121B, and the redundant signal conversion unit and the backup signal conversion unit 121B will not output a low-voltage differential signal to the display driver module 13. When the switching unit 142 is connected between the signal conversion module 12 and the display driver module 13, the target signal conversion unit 121A is electrically connected between the signal source 11 and the display driver module 13. The redundant signal conversion unit and the backup signal conversion unit 121B are not electrically connected to the display driver module 13 due to the presence of the switching unit 142. Therefore, the target signal conversion unit 121A, the redundant signal conversion unit, and the backup signal conversion unit 121B can all receive the display interface signal to generate a low-voltage differential signal. However, the low-voltage signal generated by the target signal conversion unit 121A is received by the display driver module 13, while the redundant signal conversion unit and the backup signal conversion unit 121B do not output a low-voltage differential signal to the display driver module 13.

[0053] It is understood that multiple switching units 142 can be configured. For example, switching units 142 can be configured between signal source 11 and signal conversion module 12, and between signal conversion module 12 and display driver module 13. Accordingly, multiple switching units 142 cooperate with each other to form a signal transmission link between signal source 11 and display driver module 13.

[0054] Optionally, the switching unit 142 can be implemented by any combination of one or more of the following: switches, transistors, etc.

[0055] In some embodiments, the signal conversion module 12 includes two signal conversion units 121, and the switching unit 142 may include two transistors, both controlled by the same switching control signal. When the target signal conversion unit 121A malfunctions, the switching control signal generated by the detection unit 141 has one of a high level and a low level. When the target signal conversion unit 121A is not malfunctioning, the switching control signal generated by the detection unit 141 has the other of a high level and a low level, so that the two transistors are controlled by the switching control signal to achieve time-division conduction, thereby realizing the switching control of the signal conversion unit 121.

[0056] In some embodiments, the switching unit 142 may also include multiple transistors, and the switching control signal includes multiple sub-control signals. Each transistor is controlled by a sub-control signal, and each transistor controls the on / off connection between a signal conversion unit 121 and the signal source 11 or the display driving module 13 according to the controlled sub-control signal.

[0057] It should be understood that the inclusion of two or more transistors in the switching unit 142 is merely illustrative and is not intended to specifically limit the implementation of the switching unit 142, the type of devices included in the switching unit 142, or the number of devices.

[0058] Optionally, the target link status can be detected based on cyclic redundancy check (CRC) to verify the signal transmission link protocol layer.

[0059] In some embodiments, the signal conversion unit 121 may include a counter, and the detection unit 141 may include a fault diagnostic device 1411. The counter is configured to count the number of errors in the cyclic redundancy check (CRC) of the received display interface signals performed by the signal conversion unit 121. The fault diagnostic device 1411 reads the accumulated number of errors from the counter and determines that an anomaly exists in the target link state when the read error count exceeds a preset threshold, thereby generating a switching control signal. By setting the counter and the fault diagnostic device 1411, anomaly detection of the target link state can be achieved.

[0060] Cyclic redundancy check (CR) can be used to verify the accuracy of digital transmission on a target link. CR can pinpoint signal transmission quality problems, providing information such as the degree of signal attenuation at the display interface and the extent of electromagnetic interference.

[0061] The verification module for implementing cyclic redundancy check can be built into the signal conversion unit 121. Each signal conversion unit 121 can be equipped with a verification module so that when any signal conversion unit 121 is used as the target signal conversion unit 121A, the received display interface signal can be cyclically redundant checked by the built-in verification module, thereby enabling verification of the signal transmission link protocol layer when any signal conversion unit 121 is used as the target signal conversion unit 121A.

[0062] In some embodiments, any signal conversion unit 121 may have a built-in counter so that when any signal conversion unit 121 is used as the target signal conversion unit 121A, the number of errors in the redundant cycle check can be counted separately based on the redundant cycle check. It should be noted that multiple signal conversion units 121 may also share the same counter, and the data of the counter can be cleared when switching signal conversion units 121.

[0063] Optionally, the fault diagnostic unit 1411 may be at least one of a field-programmable gate array, a microprocessor, etc.

[0064] Since only the target signal conversion unit 121A participates in the signal conversion from the display interface signal to the low-voltage differential signal between the signal source 11 and the display driver module 13, the fault diagnostic device 1411 can only read the number of errors used to count the number of cyclic redundancy checks performed by the target signal conversion unit 121A on the received display interface signal, so as to speed up the judgment of the abnormal status of the target link.

[0065] The preset threshold can be set differently depending on the usage requirements. For example, the preset threshold can be set to 200. When the number of errors read by the fault diagnostic tool 1411 is greater than 200, a switching control signal is generated to realize the switching control of the signal conversion unit 121.

[0066] Please continue reading. Figures 1D to 1E The detection unit 141 can detect physical layer anomalies in the signal transmission link based on the eye diagram. Specifically, the detection unit 141 includes an eye diagram generation unit 1412. The eye diagram generation unit 1412 is configured to sample the low-voltage differential signal and generate an eye diagram based on the low-voltage differential signal. The fault diagnostic unit 1411 is configured to generate a switching control signal when it determines that there is an anomaly in the main link state based on the eye diagram and preset parameter values.

[0067] The eye diagram generation unit 1412 can reflect the distortion of the low-voltage differential signal in the time domain, frequency domain, and voltage domain. The distortion of the low-voltage differential signal in the time domain, frequency domain, and voltage domain can reflect the influencing factors that cause timing jitter in the low-voltage differential signal and black screen on the display panel 20 (such as changes in contact resistance due to vibration, decreased driving capability of the display drive control system 10, power supply ripple, electromagnetic interference, impedance mismatch, etc.).

[0068] In some embodiments, the eye diagram generation unit 1412 may include a sampling circuit, an eye diagram generation circuit, etc. The sampling circuit is configured to sample the low-voltage differential signal, and the eye diagram generation circuit is configured to truncate and superimpose the acquired low-voltage differential signal to generate an eye diagram.

[0069] In some embodiments, the fault diagnostic tool 1411 performs multi-faceted and multi-dimensional analysis of the low-voltage differential signal based on preset parameter values ​​and information such as eye width, eye height, and eye opening in the eye diagram. Based on the eye opening, the distortion of the low-voltage differential signal in the time and voltage domains can be obtained; based on the vertical closure degree of the eye diagram, related information such as power supply noise can be obtained; and based on the horizontal closure degree of the eye diagram, clock jitter or crosstalk between data can be obtained.

[0070] Eye diagrams can be used to analyze the quality of low-voltage differential signals. Whether the quality of the low-voltage differential signal meets the requirements can be determined based on the eye diagram requirements specified in the display driver module 13 specification.

[0071] It should be noted that the preset parameter values ​​can be set differently depending on the actual application.

[0072] Please continue reading. Figures 1A to 1ESince each signal conversion unit 121 needs to generate a low-voltage differential signal based on the display interface signal output by the signal source 11, each signal conversion unit 121 needs to be connected to the interface where the signal source 11 outputs the display interface signal. However, since only one signal conversion unit 121 participates in the signal conversion from the display interface signal to the low-voltage differential signal between the signal source 11 and the display driver module 13, if the signal source 11 is provided with multiple interfaces electrically connected to multiple signal conversion units 121 simultaneously, then only the interface electrically connected to the target signal conversion unit 121A will be effectively utilized, while the interfaces that output display interface signals to the backup signal conversion unit 121B and the redundant signal conversion unit will be idle, resulting in a decrease in the interface utilization rate of the signal source 11. Furthermore, in order to reduce problems such as display misalignment that may occur before and after the switching of the signal conversion unit 121, the display interface signals output by the signal source 11 to the target signal conversion unit 121A, the backup signal conversion unit 121B, and the redundant signal conversion unit must also be kept synchronized, thereby increasing the performance requirements of the signal source 11 and increasing the cost. Therefore, in order to improve the interface utilization of the signal source 11, realize the synchronization of the display interface signals received by multiple signal conversion units 121, and reduce costs, the display drive control system 10 can also include a signal distribution module 15.

[0073] The signal distribution module 15 is electrically connected between the signal source 11 and multiple signal conversion units 121. The signal distribution module 15 is configured to split the display interface signal into multiple synchronous sub-display interface signals and output them. The number of output ports of the signal distribution module 15 that output the multiple sub-display interface signals is equal to the number of the multiple signal conversion units 121, and the multiple signal conversion units 121 are electrically connected to the output ports of the signal distribution module 15 in a one-to-one correspondence.

[0074] Please continue reading. Figures 1D to 1ETaking the signal conversion module 12, which includes a first signal conversion unit 1211 and a second signal conversion unit 1212, as an example, the signal source 11 may only include an interface for outputting display interface signals to the signal distribution module 15. The signal distribution module 15 may include an output port for outputting sub-display interface signals to the first signal conversion unit 1211, and an output port for outputting sub-display interface signals to the second signal conversion unit 1212. The output port of the signal distribution module 15 for outputting sub-display interface signals to the first signal conversion unit 1211 is used to output the first sub-display interface signal, and the output port of the signal distribution module 15 for outputting sub-display interface signals to the second signal conversion unit 1212 is used to output the second sub-display interface signal. The frequency, phase, and amplitude of the first sub-display interface signal and the second sub-display interface signal may be the same. When the first signal conversion unit 1211 is used as the target signal conversion unit 121A, the first signal conversion unit 1211 generates a low-voltage differential signal based on the first sub-display interface signal. When the second signal conversion unit 1212 is used as the target signal conversion unit 121A, the second signal conversion unit 1212 generates a low-voltage differential signal based on the second sub-display interface signal.

[0075] Optionally, the signal distribution module 15 can be an EDP distributor.

[0076] Please continue reading. Figures 1A to 1E To reduce the likelihood of display misalignment on the display panel 20 before and after the signal switching unit 142 switches, the display drive control system 10 also includes a clock synchronization module 16.

[0077] The clock synchronization module 16 is electrically connected to multiple signal conversion units 121, and the clock synchronization module 16 is configured to output multiple phase-synchronized clock signals. Any signal conversion unit 121 is electrically connected to the output port of the clock synchronization module 16 that outputs a clock signal, so as to synchronize the frequency of the low-voltage differential signals generated by the two signal conversion units 121 that switch the blanking interval of the current display frame.

[0078] Please continue reading. Figures 1D to 1ETaking the signal conversion module 12, which includes a first signal conversion unit 1211 and a second signal conversion unit 1212, as an example, the clock synchronization module 16 may include an output port that outputs a clock signal to the first signal conversion unit 1211, and an output port that outputs a clock signal to the second signal conversion unit 1212. The output port of the clock synchronization module 16 that outputs a clock signal to the first signal conversion unit 1211 is used to output the first clock signal, and the output port of the clock synchronization module 16 that outputs a clock signal to the second signal conversion unit 1212 is used to output the second clock signal. When the first signal conversion unit 1211 is used as the target signal conversion unit 121A, the first signal conversion unit 1211 generates a first low-voltage differential signal based on the first sub-display interface signal and the first clock signal. After switching the target signal conversion unit 121A from the first signal conversion unit 1211 to the second signal conversion unit 1212, the second signal conversion unit 1212 generates a second low-voltage differential signal based on the second sub-display interface signal and the second clock signal. The frequencies of the first low-voltage differential signal and the second low-voltage differential signal are synchronized to reduce the probability of display misalignment or other problems on the display panel 20 before and after the switching signal conversion unit 121.

[0079] In some embodiments, the clock synchronization module 16 includes a clock source 161 and a clock buffer 162. The clock source 161 is configured to generate a reference clock signal. The clock buffer 162 is electrically connected to the clock source 161 and is configured to receive the reference clock signal to generate multiple phase-synchronized clock signals. Optionally, the clock source 161 may be a 25MHz crystal oscillator.

[0080] In some implementations, excessively high temperatures can also cause abnormalities in the signal transmission link, resulting in a black screen. Therefore, to improve the black screen problem caused by temperature, the detection unit 141 is also configured to detect the operating temperature of the target signal conversion unit 121A, which is electrically connected between the signal source 11 and the display driver module 13, so as to generate a switching control signal when the operating temperature is abnormal, thereby switching the signal conversion unit 121. This allows the backup signal conversion unit 121B to continue providing the required low-voltage differential signal to the display driver module 13 as the new target signal conversion unit 121A, ensuring the continuous display of the display panel 20 and improving the black screen problem caused by temperature.

[0081] Optionally, the detection unit 141 may include a temperature sensor configured to detect the operating temperature of the target signal conversion unit 121A. The fault diagnostic unit 1411 is configured to read the result detected by the temperature sensor and determine that the operating temperature of the target signal conversion unit 121A is abnormal when the read result detected by the temperature sensor is greater than a preset temperature. The preset temperature can be set according to actual application requirements.

[0082] In some embodiments, the temperature sensor may also be built into the signal conversion unit 121. The fault diagnostic unit 1411 determines whether there is an abnormality in the operating temperature of the target signal conversion unit 121A by reading the result detected by the temperature sensor built into the target signal conversion unit 121A.

[0083] Please continue reading. Figures 1A to 1E To reduce the impact of a fault in the target signal conversion unit 121A on the display drive control system 10, and to block the propagation path of the fault from the target signal conversion unit 121A to the signal source 11, the backup signal conversion unit 121B, the redundant signal conversion unit, and the display drive module 13, the failure range of the display drive control system 10 is made controllable. The detection unit 141 can also be configured to generate a power supply switching signal when the operating temperature of the target signal conversion unit 121A becomes abnormal. The display drive control system 10 also includes a power isolation module 17, which is electrically connected between multiple signal conversion units 121 and the power supply 18. The power isolation module 17 is configured to disconnect the electrical connection between the target signal conversion unit 121A and the power supply 18 during the blanking interval according to the power supply switching signal, and connect the electrical connection between another signal conversion unit 121 (i.e., the backup signal conversion unit 121B) and the power supply 18, so that the original target signal conversion unit 121A has no power supply, thereby limiting the fault to the original target signal conversion unit 121A and realizing the control of single-point fault failure.

[0084] To illustrate further, let's take the signal conversion module 12, which includes a first signal conversion unit 1211 and a second signal conversion unit 1212, as an example. Figure 1D As shown, the first signal conversion unit 1211 is electrically connected between the signal source 11 and the display driver module 13. When the operating temperature of the first signal conversion unit 1211 becomes abnormal, the detection unit 141 generates a switching control signal and a power supply switching signal. The switching unit 142 switches the first signal conversion unit 1211, which is electrically connected between the signal source 11 and the display driver module 13, to the second signal conversion unit 1212 during the blanking interval of the current display frame. The power isolation module 17 switches the first signal conversion unit 1211, which is electrically connected to the power supply 18, to the second signal conversion unit 1212 according to the power supply switching signal during the blanking interval of the current display frame. Figure 1E As shown.

[0085] Optionally, the display driver control system 10 can be equipped with multiple power supplies. The power supply corresponding to the target signal conversion unit 121A can be the main power supply, and the power supplies corresponding to the backup signal conversion unit 121B and the redundant signal conversion unit can be used as backup power supplies. When the backup signal conversion unit 121B is used as the target signal conversion unit 121A, the backup power supply becomes the new main power supply. When the backup power supply is not used as the main power supply, it can be in a low-power standby state to reduce the power consumption of the display driver control system 10.

[0086] It should be understood that the target signal conversion unit 121A, the backup signal conversion unit 121B, and the redundant signal conversion unit can also share the same power supply 18 for power supply.

[0087] like Figure 2 This is a flowchart of a display driving control method provided in an embodiment of this application. This application also provides a display driving control method that uses the aforementioned display driving control system 10 to control the display panel 20 for display. The display driving control method includes:

[0088] Step S1: Generate a display drive signal based on the low-voltage differential signal to control the display panel 20 to display; and

[0089] Step S2: During the display process of the display panel 20, fault detection is performed on the signal conversion unit 121 that generates the low voltage differential signal, and when the signal conversion unit 121 fails, the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13 is switched to another signal conversion unit 121 during the blanking interval.

[0090] In step S1, a low-voltage differential signal can be generated based on the display interface signal by any signal conversion unit 121 in the signal conversion module 12, a display drive signal can be generated by the display drive module 13, and the display interface signal can be output by the signal source 11. Step S2 is then executed by the detection switching module 14. In step S2, the detection switching module 14 performs fault detection on the signal conversion unit 121 electrically connected between the signal source 11 and the display drive module 13.

[0091] Optionally, the signal source 11 includes a main control SOC or an image processor. The signal conversion unit 121 includes a bridge chip, and the display driver module 13 includes a display driver chip or a chip integrating touch and display driving. For details regarding the detection and switching control module, please refer to the relevant descriptions in the aforementioned display driver control system 10; they will not be repeated here.

[0092] It should be understood that the display driving control method of this application achieves display control of the display panel 20 by applying any of the aforementioned display driving control systems 10. Therefore, the display driving control method of this application has the same or similar technical effects as the aforementioned display driving control systems 10.

[0093] Please continue reading. Figure 3 This is a schematic diagram of the structure of the display device provided in the embodiments of this application. This application also provides a display device, including any of the above-mentioned display driving control system 10 and a display panel 20. The display panel 20 is electrically connected to the display driving control system 10 and is configured to display according to the display driving signal output by the display driving control system 10.

[0094] The display device provided in this application can be a mobile phone, computer, television, etc. In some embodiments, the display device provided in this application can be used as an in-vehicle display device, and the display device is configured to display information related to the vehicle body, thereby enabling drivers and passengers to intuitively obtain information related to the vehicle body.

[0095] In some embodiments, the display driver module 13 is a Touch and Display Driver Integration (TDDI) chip. As the resolution requirements of automotive display devices increase, many require the use of an EDP interface to meet display requirements. However, since the touch and display driver integration chip needs to receive low-voltage differential signals, the signal conversion unit 121 can be a bridging chip. The bridging chip converts the display interface signal into a low-voltage differential signal and outputs it to the display driver module 13 to achieve display control of the automotive display device.

[0096] Bridge chips are prone to failure at high operating temperatures, and are susceptible to poor soldering due to vibration and other factors. Furthermore, the link used to transmit display interface signals is vulnerable to electromagnetic interference, which affects the conversion of display interface signals to low-voltage differential signals. This results in poor quality low-voltage differential signals output by the bridge chip or even a black screen. The display driver control system 10 and display device provided in this application utilize a detection switching module 14 to detect faults in the signal conversion unit 121 electrically connected between the signal source 11 and the display driver module 13. Furthermore, during the blanking interval of the current display frame, one signal conversion unit 121 can be switched to another, enabling seamless replacement of the faulty unit. Therefore, the display device provided in this application improves the problems of poor low-voltage differential signal quality and black screens, reducing the safety risks to drivers and passengers who rely on the content displayed on the display panel 20 for vehicle driving information.

[0097] It should be understood that the display device of this application achieves display control of the display panel 20 by applying any of the aforementioned display drive control systems 10. Therefore, the display device of this application has the same or similar technical effects as the aforementioned display drive control systems 10.

[0098] The display drive control system 10, display drive control method, and display device provided in this application can also be used in different fields such as toys and medical devices.

[0099] This application also provides a device that includes any of the above-described display drive control system 10 and / or display device. This device can be applied in multiple fields such as transportation, medical care, education, entertainment, and daily life.

[0100] In some embodiments, the device including the display drive control system 10 and / or the display device may be an automobile.

[0101] Because the display driving control system 10, display driving control method, and display device provided in this application can achieve fault detection and seamless switching of the signal conversion unit 121 through the detection switching module 14, thereby reducing the probability of display interruption caused by single-point failure, the design disclosed in this application can be used in in-vehicle systems requiring Automotive Safety Integrity Level (ASIL) functional safety certification, augmented reality head-up display (AR-HUD) systems with high requirements for display continuity, and cost-sensitive mid-to-high-end vehicles. For example, the design disclosed in this application can be used in in-vehicle systems requiring ASIL-B or ASIL-C functional safety certification. ASIL-B certification requires the product to maintain a safe state in the event of a fault, avoiding harm to road users, while ASIL-C represents a higher safety level.

[0102] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A display driving control system, characterized in that, include: The signal source is configured to output a display interface signal; The signal conversion module includes multiple signal conversion units and is electrically connected to the signal source, and is configured to generate a low-voltage differential signal based on the display interface signal; The display driving module is electrically connected to the signal conversion module and is configured to receive the low-voltage differential signal output by the signal conversion unit to generate a display driving signal to control the display panel to display. as well as The detection switching module is configured to perform fault detection on the signal conversion unit electrically connected between the signal source and the display driver module, and when the signal conversion unit electrically connected between the signal source and the display driver module fails, switch the signal conversion unit electrically connected between the signal source and the display driver module to another signal conversion unit during the blanking interval of the current display frame of the display panel.

2. The display driving control system according to claim 1, characterized in that, The detection switching module includes: A detection unit is configured to detect the link status of the signal transmission link between the signal source and the display driver module, and generate a switching control signal when the link status is abnormal; the signal transmission link includes a target link from the signal source to the signal conversion unit electrically connected between the signal source and the display driver module, and a main link from the signal conversion unit electrically connected between the signal source and the display driver module to the display driver module; the link status includes the target link status of the target link and the main link status of the main link; when at least one of the target link status and the main link status is abnormal, it is determined that the link status is abnormal; and A switching unit, electrically connected to the detection unit, is configured to switch the signal conversion unit electrically connected between the signal source and the display driver module to another signal conversion unit during the blanking interval, according to the switching control signal.

3. The display driving control system according to claim 2, characterized in that, The signal conversion unit includes a counter, which is configured to count the number of errors in the cyclic redundancy check of the received display interface signal by the signal conversion unit. The detection unit includes a fault diagnostic device, which is used to read the number of errors accumulated by the counter, and determine that the target link status is abnormal when the number of errors read is greater than a preset threshold, so as to generate the switching control signal.

4. The display driving control system according to claim 2, characterized in that, The detection unit includes: An eye diagram generation unit is configured to sample the low-voltage differential signal and generate an eye diagram based on the low-voltage differential signal; and The fault diagnostic tool is configured to generate the switching control signal when it determines that there is an abnormality in the state of the second link based on the eye diagram and preset parameter values.

5. The display control system according to claim 2, characterized in that, The blanking interval includes a vertical blanking interval, and the display driving module is further configured to output a synchronization enable signal, wherein the time interval between the falling edge and the rising edge of the synchronization enable signal is aligned with the vertical blanking interval. The switching unit is configured to switch the signal conversion unit electrically connected between the signal source and the display driver module to another signal conversion unit according to the switching control signal during the vertical blanking interval.

6. The display driving control system according to claim 1, characterized in that, Also includes: The signal distribution module is electrically connected between the signal source and the multiple signal conversion units, and is configured to split the display interface signal into multiple synchronized sub-display interface signals and output them; The number of output ports of the signal distribution module that output multiple sub-display interface signals is equal to the number of multiple signal conversion units, and the multiple signal conversion units are electrically connected to the output ports of the signal distribution module in a one-to-one correspondence.

7. The display driving control system according to claim 1, characterized in that, Also includes: A clock synchronization module, electrically connected to multiple signal conversion units, is configured to output multiple phase-synchronized clock signals; In this embodiment, any one of the signal conversion units is electrically connected to the output port of the clock synchronization module that outputs a clock signal, so that the frequencies of the low-voltage differential signals generated by the two signal conversion units that switch during the blanking interval are synchronized.

8. The display driving control system according to claim 2, characterized in that, The detection unit is configured to detect the operating temperature of the target signal conversion unit electrically connected between the signal source and the display driver module, so as to generate the switching control signal when the operating temperature is abnormal.

9. The display driving control system according to claim 8, characterized in that, The detection unit is configured to generate the power supply switching signal when the operating temperature becomes abnormal. The display driver control system further includes a power isolation module, which is electrically connected between the plurality of signal conversion units and the power supply. The power isolation module is configured to disconnect the electrical connection between the target signal conversion unit and the power supply during the blanking interval according to the power supply switching signal, and connect the electrical connection between another signal conversion unit and the power supply.

10. The display driving control system according to any one of claims 1-9, wherein the signal conversion module includes a first signal conversion unit and a second signal conversion unit, the first signal conversion unit includes a first bridging chip, the second conversion unit includes a second bridging chip, and the first bridging chip and the second bridging chip are respectively connected between the detection switching module and the display driving module.

11. A display driving control method, characterized in that, The display panel is controlled to display using the display driving control system as described in any one of claims 1 to 10, wherein the display driving control method includes: The display panel is controlled to display information based on a display drive signal generated from a low-voltage differential signal; and During the display panel display process, fault detection is performed on the signal conversion unit that generates the low-voltage differential signal, and when the signal conversion unit fails, the signal conversion unit electrically connected between the signal source and the display driver module is switched to another signal conversion unit during the blanking interval.

12. A display device, characterized in that, include: The display driving control system as described in any one of claims 1 to 10; as well as The display panel is electrically connected to the display driving control system and is configured to display according to the display driving signal output by the display driving control system.

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