1817 results about "Fast switching" patented technology

The invention discloses a low-voltage transformer area examination meter practical training device and a fault simulation control method, and relates to the technical field of electric power practical training. The device aims at the problems of single scene, extensive evaluation and low skill improvement efficiency in traditional electric power practical training. The meter simulation module is compatible with various meters and is matched with a dual-communication protocol to realize efficient data transmission; the intelligent interaction module provides high-quality interaction experience through a high-definition touch screen and low-delay transmission; the data generation module can quickly switch customized scenes, and the fault simulation module can accurately inject various faults; the training management module depends on advanced technologies of knowledge maps, deep learning and fuzzy comprehensive evaluation to realize full-process closed-loop management from project design and operation guidance to evaluation feedback and intelligent optimization; all the modules cooperate efficiently, and the professionality, the accuracy and the efficiency of power failure troubleshooting and operation and maintenance skill training of trainees are remarkably improved.

The invention relates to a multi-product-line-oriented robot welding integration method, device and equipment and a medium, and the method comprises the steps that three-dimensional geometrical characteristics and material attribute data of multiple types of workpieces are collected, and geometric parameters and material mechanical properties of weld joints are extracted; an order demand template is intelligently matched, and initial welding parameters and a clamp configuration scheme are generated; the health state of production equipment is evaluated in real time, and the collision-free movement track of the mechanical arm is planned; dynamically analyzing the joint angle sequence to generate a high-precision servo control signal; the welding process is monitored in real time, and current and molten pool temperature parameters are corrected; and iteratively optimizing the algorithm weight of the process knowledge base to improve the adaptive capacity. Through cooperation of multi-source data fusion and an intelligent algorithm, rapid switching of multiple kinds of workpieces, self-adaptive compensation of the equipment operation state and closed-loop optimization of welding process parameters are achieved, and the equipment utilization rate and the welding quality stability in a flexible production scene are remarkably improved.

The invention discloses a method for supporting fast switching of multiple models by NPU (Network Processing Unit) firmware. According to the invention, the system real-time performance and the resource utilization rate in a multi-task scene are obviously improved. Through a dynamic hierarchical caching strategy and a priority scheduling mechanism, the system can intelligently allocate cache resources and preferentially guarantee rapid loading of a high-frequency and high-urgency model, for example, in an automatic driving scene, switching delay of a path planning model can be reduced to a millisecond level, and non-perceptual switching of key tasks is guaranteed. The incremental parameter loading technology and firmware-level context management are deeply fused, only model difference data are transmitted, and hardware is utilized to accelerate and recover a calculation state, so that bandwidth waste caused by traditional full-amount loading is greatly reduced, the model switching efficiency of edge computing equipment is improved by more than 10 times when multiple tasks such as voice recognition and image processing are carried out in parallel, and the efficiency of the edge computing equipment is improved. And meanwhile, the calculation precision is kept lossless.

The invention provides a distribution network monitoring heterogeneous converged communication self-switching device and a distribution network monitoring heterogeneous converged communication self-switching method. The system comprises a communication module unit, a data processing unit and a switching execution unit. In the data processing unit, an environment sensing unit receives state data of the communication module unit, and a PICO unit processes link state data and uploads the link state data to an MCU unit for processing; the data encryption unit is used for encrypting and decrypting transmission data; the data caching unit is used for storing data transmitted during communication abnormity or switching and reissuing the data after communication recovery; and the MCU processing unit executes a link switching strategy according to the data processed by the PICO unit, and controls the switching execution unit to switch when detecting that the quality of the current main communication link is reduced to be below a preset threshold value. According to the invention, automatic and rapid switching in different network environments is realized, and the transmission stability and efficiency of the monitoring data of the power distribution network are remarkably improved.

The invention relates to the technical field of industrial detection, and discloses a multi-channel self-adaptive glass component defect detection method which sequentially comprises the following steps: S1, multi-channel image acquisition; performing rapid switching and imaging of three illumination modes by adopting a time-sharing stroboscopic technology to obtain a multi-channel image of the glass component; s2, multi-channel image registration is carried out; s2, registering the multi-channel images obtained in the step S1 so as to align the features of the multi-channel images, and obtaining registered multi-channel images; s3, multi-channel feature extraction and fusion; performing single-channel feature extraction on the registered multi-channel image, and combining a channel attention mechanism and a space attention mechanism to obtain a multi-channel image fusion feature map; s4, segmenting a defect region; and S5, a post-processing scoring mechanism is used for preventing over-killing. Through a multi-channel image acquisition technology, multi-scale feature extraction in deep learning, a self-adaptive attention mechanism and a post-processing scoring mechanism are combined to prevent over-killing, and more efficient and more accurate plane glass component defect detection is carried out.

The invention discloses an unmanned aerial vehicle data transmission system based on information importance grading. In the invention, through dynamic priority division and intelligent resource scheduling, the execution reliability of the key task in a complex environment is obviously improved. The system preferentially guarantees stable transmission of first-level data (such as positions and emergency instructions) in a weak signal scene, and a standby machine is quickly switched to a relay node or a cluster topological structure is adjusted, so that task failure caused by communication interruption is avoided. Even if the signal strength of the sub-machine is suddenly reduced, the system can still ensure real-time return of key instructions, meanwhile, unnecessary data are automatically compressed or delayed, bandwidth occupation is reduced, the task success rate is effectively improved, and the overall stability and adaptability of a communication network are enhanced through predictive resource deployment and dynamic path optimization. The intelligent relay scheduling module combines real-time environment data and task requirements, deploys a standby machine to a high-risk area in advance, and reduces the risk of communication interruption caused by terrain shielding or weather interference.

The invention discloses a high-precision laser ranging system and method based on multi-frequency modulation, and relates to the field of laser ranging, and the system comprises a multi-frequency laser transmitting module which comprises generators of different frequency bands and can be independently regulated, rapidly switched and matched with a high-precision frequency modulation unit; the laser receiving and signal conditioning module is used for processing signals by using an avalanche photodiode, a low-noise preamplifier and the like; the signal processing and analyzing module is used for calculating the distance by means of a high-speed digital signal processor in combination with a multi-frequency distance measurement algorithm; a display and control module and a temperature compensation module are further included, the method comprises the steps of multi-frequency laser emission, receiving conditioning, signal processing, display control and temperature compensation, and high-precision distance measurement is achieved through fine operation according to environment and target characteristics. The method is high in distance measurement precision, and error compensation in a complex environment exceeds 90%; the adaptability is high, and automatic adjustment is achieved in different distances and environments; the real-time performance is good, and a result can be obtained within 10 milliseconds; operation is convenient, wireless and data management is supported, and laser ranging innovation is promoted.

The invention relates to the technical field of adaptive routing optimization, and particularly discloses a topology self-recognition and routing optimization method and system for a concentrator and a collector, and the method comprises the steps: carrying out the topology modeling of a multi-layer heterogeneous network; executing high-speed link state monitoring based on the initial topological graph; global loop detection and link optimization are completed based on the link state matrix; a weighted robust multi-dimensional path selection method is adopted to configure a main path and a standby path for each node; and monitoring the path state in real time and dynamically switching. In the prior art, a static route, a single protocol path or a fixed main and standby path is mainly adopted, and especially in a cross-protocol, cross-level and dynamic multi-node environment in a smart city, rapid path switching and high-reliability route redundancy guarantee cannot be realized. Due to the fact that the multi-dimensional path selection method and the cross-level and cross-protocol self-adaptive switching strategy are adopted, the problems of routing interruption and performance reduction are avoided, and the reliability of the whole network is improved.

The invention discloses a smart power grid fault-tolerant communication system and method based on multi-operator channel switching, and the method comprises the steps: collecting heterogeneous network and equipment state data through an intelligent sensing layer, achieving the network quality prediction and multi-target optimization through an AI decision engine, integrating spectrum resources and network slices through a resource cooperative control layer, and achieving the fault-tolerant communication of a smart power grid. The edge execution layer executes hardware-level fast switching, the emergency disaster recovery layer provides multi-dimensional fault recovery, and the security trusted layer guarantees data security. The method breaks through the bottleneck of traditional network switching, realizes high-reliability and low-delay transmission of power business, is suitable for scenes of intelligent substations, distribution network automation and the like, and remarkably improves the fault-tolerant capability and resource utilization efficiency of intelligent power grid communication.

The invention discloses a high-speed environment network switching optimization system and method based on meta-policy gradient, and relates to the technical field of wireless communication, and the system comprises a data collection module which is responsible for collecting the network environment and equipment state information of user equipment in real time, carrying out the preprocessing and filtering operation, and outputting the information; the model training module is used for training a switching strategy model on a plurality of simulation tasks by using historical data by adopting a double-layer optimization architecture based on a meta-strategy gradient, so that the model can quickly adapt to new switching requirements in different environments; the online decision-making module is responsible for receiving the output data of the data collection module, calling a model to generate an optimal switching strategy, then executing the strategy and monitoring a switching result; and the self-correction module is responsible for receiving the switching result of the online decision-making module and performing short-term fine adjustment and periodic updating on the model so as to ensure the long-term adaptability of the model in different environments. The method is used for fast network switching in the high-speed mobile environment.

The utility model discloses a zero interruption dual power supply fast switching device, comprising a dual power supply switch, a power electronic assembly, an output switch QF and a load which are connected in sequence, the power electronic assembly comprises an electronic bypass unit VT, a mechanical bypass contactor KM, an isolation transformer TM, a bidirectional converter CU and a super capacitor energy storage unit CAP, a contact S1 in the dual-power switch is connected with a main power supply, a contact S2 is connected with a standby power supply, a mechanical bypass contactor KM is connected with an electronic bypass unit VT in parallel, an isolation transformer TM is connected to the output end of the electronic bypass unit VT, and the two ends of a bidirectional converter CU are connected with the isolation transformer TM and a super capacitor energy storage unit CAP respectively. According to the device, the dual-power-supply change-over switch is matched with the power electronic component, so that rapid switching of the dual-power-supply switch is realized, the problem of power supply interruption in the switching process is solved, and the reliability of power supply is improved; and meanwhile, few energy storage elements are used, and the cost is low.

The invention relates to the technical field of laser processing, in particular to a laser light path rapid switching method and related equipment. The laser light path fast switching method comprises the steps that a single laser emits original laser, the original laser passes through a laser collimator or directly enters a multi-channel reflecting mirror set to adjust a transmission path, a beam expander is selectively started for beam expanding according to the machining requirement, a preliminary shaping light beam is formed, and a basic light path matched with a follow-up optical device is constructed. According to the invention, through the integrated driving mechanism and grating ruler full-closed-loop control rapid switching device, the mobile carrier pre-installed with multiple DOEs is driven to realize accurate cutting-in of a target light spot element in a light path, and the problem of rapid adaptation of multiple light spot patterns in a single laser system is solved.

The invention discloses a message processing method and related equipment, a first communication device obtains a hash key value according to an obtained first message and obtains a first routing parameter of a flow corresponding to the first message, the first communication device determines a first path for sending the first message according to the hash key value and the first routing parameter, and the first path is used for sending the first message to the first communication device. And sending the first message through the first path. Therefore, when the first communication device senses that the grey fault occurs and then needs to forward the message, the first communication device only needs to use the routing parameter of the stream to which the message to be forwarded belongs and the hash key value in the message to be forwarded as the parameter of the hash routing to perform the hash routing; according to the method, the forwarding path of the message to be forwarded can be quickly switched when the gray fault occurs, so that the configuration work needing to be implemented for switching the path is simplified, the time overhead of switching the path is reduced, the path can be switched in time after the gray fault occurs, the recovery time of the service flow is short enough, and the influence of the gray fault on the service is reduced as far as possible.

The invention relates to the technical field of video data compression and transmission, and particularly discloses a multi-modal video data compression and transmission method, which comprises the following steps of: firstly, extracting a feature set of multi-modal video data, dynamically evaluating a feature priority based on the feature set, and then, carrying out differential compression on different priority modals by adopting a hierarchical compression strategy, and finally, screening available paths through historical transmission data, matching path intervals in combination with modal priorities, monitoring a network state in real time, dynamically judging a transmission state, and quickly switching to a suboptimal path in case of abnormality. According to the method, through dynamic feature priority evaluation, a hierarchical compression strategy and real-time transmission path monitoring and switching, the defects of a traditional method in the aspects of compression efficiency, transmission quality and real-time adaptability are overcome, the influence of network congestion or faults on the transmission quality is effectively avoided, and the compression efficiency, the transmission quality and user experience are remarkably improved.

The invention discloses an intelligent optimization scheduling method for household energy use, and relates to the technical field of household energy intelligent optimization, and the method comprises the following steps: building a communication network through an Internet of Things device, collecting the operation state information of household appliances, an energy storage device and an energy supply device, and when the device communication abnormality is detected, sending the operation state information to a server; and recording the state data of the fault equipment and sending detailed fault reminding information to the user terminal. According to the invention, through the multi-protocol standby communication path and the dynamic switching mechanism, the household energy management system rapidly switches the path when the communication fault occurs, the communication stability is ensured, and the system robustness and the resource efficiency are improved. And in combination with priority scheduling and an intelligent algorithm, the system preferentially guarantees operation of key equipment, optimizes energy distribution, reduces the cost in the peak period, improves the utilization efficiency and reduces waste. According to the scheme, core function continuity is ensured, user experience is improved, and remarkable economic and environment-friendly benefits are brought.

The invention relates to the technical field of intelligent manufacturing, in particular to a flexible intelligent manufacturing system for multi-variety small-batch production, which comprises a flexibility enhancement module, a cost efficiency improvement module, an information interaction enhancement module, a technology depth fusion module and a decision ability optimization module, rapid switching and optimization of the production process can be achieved, so that production efficiency and product quality are improved, technological parameters are intelligently adjusted according to real-time production requirements, production requirements of diversified products are met, production preparation time is effectively shortened, the production cycle is shortened, meanwhile, by means of the Internet of Things technology, the system can monitor the state of production equipment in real time, and production efficiency is improved. In addition, through data analysis and a prediction model, the system can optimize inventory management, reduce the production cost, significantly improve the production flexibility and efficiency in a multi-variety small-batch production environment, and bring significant technical effects and economic benefits to the manufacturing industry.

The utility model discloses a speed reducing mechanism for an automatic change-over switch and the automatic change-over switch, and relates to the technical field of low-voltage electric appliances. The speed reduction mechanism for the automatic change-over switch comprises a speed reduction wheel and a rocker, the speed reduction wheel is movably arranged on an output shaft of an operating mechanism of the automatic change-over switch in a sleeving mode, a speed reduction rail is arranged on the speed reduction wheel, and the rocker is connected with the speed reduction wheel. The output part of the operating mechanism is abutted against the speed reduction wheel after running for a certain idle stroke, the speed reduction wheel is forced to rotate, and the rocker is driven to move along the speed reduction track to decelerate rotation of the output shaft. The speed reducing mechanism for the automatic change-over switch and the automatic change-over switch can solve the problem of power supply short circuit caused by too fast switching of the moving contact between the common closing position and the standby closing position in the prior art.

The invention relates to the technical field of power equipment, and discloses a power electronic transformer redundant controller switching method, which comprises the following steps of: constructing a redundant control array to collect analog quantity data of a power electronic transformer in real time so as to obtain two groups of instantaneous interaction data; the master controller generates a control logic by any one group of instantaneous interaction data to control the operation state of the power electronic transformer, and sends the other group of instantaneous interaction data to the slave controller in a preset interruption period to dynamically update the data of the slave controller; through the redundancy design of the master controller and the slave controller, when the master controller breaks down, the master controller can be quickly switched to the slave controller in a control period, and the switched master controller continues the last updated instantaneous interaction data of the master controller before switching, so that the non-impact switching is realized, the fluctuation or shutdown risk of the system is avoided, and the reliability of the system is improved. The stable operation of the power electronic transformer is ensured, and the maintenance and shutdown loss caused by faults is reduced, so that the overall maintenance cost is reduced.

The invention discloses a rapid communication and redundancy control method for an AGC substation of a distributed photovoltaic power station, and the method comprises the following steps: S1, receiving an automatic power generation control instruction from a power grid dispatching system in parallel and uploading real-time operation data of the photovoltaic power station through two independent communication links; according to the invention, the reliability and robustness of the system are fundamentally improved; by constructing a physical basis of parallel work of two paths of independent communication links and combining real-time state monitoring and a millisecond-level rapid switching mechanism, the method thoroughly changes the fragile situation that the whole substation is disconnected and the function is paralyzed due to a single communication channel or a power supply fault of a traditional system; when the main optical fiber link is interrupted due to construction damage or equipment failure, the system can automatically and seamlessly switch all communication services to the standby Ethernet or wireless link without depending on manual intervention, and it is ensured that the transmission path of the scheduling control instruction is always smooth.

Disclosed are a method and an apparatus for service fast switchover. The present disclosure may be applied in a spine-leaf architecture, wherein the method may be applied to a backbone spine node. The backbone spine node may loop back a data packet sent through a port connected to a faulty member path from Equal Cost Multi Paths (ECMPs) to which the faulty member path belongs, select one fast switchover member path from the ECMPs prior to routes in a network with the ECMPs converging, determine an access node connected to the fast switchover member path as a next hop, perform layer 3 forwarding on the data packet and encapsulate a specified Media Access Control, MAC, address as a destination MAC address, and send the data packet, with the specified MAC address as the destination MAC address, to the next hop through the fast switchover member path.

The utility model discloses a multilayer storage device, which relates to the technical field of stock bins and comprises a fixed station, a base structure and a sensor assembly. The movable stock bin comprises a stock bin frame and a multi-layer tray assembly which are connected in a sliding mode, a moving structure is arranged at the bottom of the movable stock bin and matched with the base structure, the tray assembly is matched with the sensor assembly to be used for detecting the position of a tray, and the movable stock bin is provided with an opening; and the robot is provided with a material taking structure, and the material taking structure is opposite to the opening. The material storage amount is increased, frequent manual material changing is avoided, the material bins can be rapidly switched, the downtime of a robot is shortened, and the production efficiency is improved.

The invention provides a multi-station numerical control gear grinding machine tool which comprises a machine tool body, a rotary indexing table stand column, a sliding table, a mounting base, a rotary shaft and a grinding wheel spindle, quick switching of workpieces can be achieved only through rotation of the rotary indexing table stand column, the distance between the workpiece spindle and the center of the rotary indexing table stand column is shortened by arranging a workpiece containing concave position, and the machining efficiency is improved. And the transmission precision can be improved. The rotating shaft is arranged in the second installation space, the second installation space communicates with the first installation space, a rotating drive of the rotating shaft can be arranged in the first installation space, the overall gravity center of the grinding wheel spindle and the sliding table is located in the sliding table, the stability of the structure can be improved, and then the transmission precision is improved. Therefore, the multi-station numerical control gear grinding machine tool can effectively improve the transmission stability and the transmission precision, so that the machining quality is improved, and the stability of equipment is improved.

The invention relates to the technical field of three-dimensional scene information transmission, and discloses a digital information transmission method and system in a three-dimensional level loading process, and the method comprises the steps: obtaining three-dimensional level scene information, and dividing the three-dimensional level scene information into a plurality of scene region units; executing multi-factor priority evaluation; executing secondary priority evaluation to generate a resource task queue; adopting a multi-stage asynchronous streaming mechanism to complete digital resource transmission based on the loading granularity; and dynamically screening resources in combination with the GPU rendering budget. Compared with the prior art, the problem that loading efficiency and real-time performance cannot be considered in a complex three-dimensional scene is solved, and especially the technical problem that loading and rendering collaborative optimization is difficult to realize when a user view angle is quickly switched or the granularity difference of scene resources is large is solved. Due to the fact that space partitioning, dynamic priority evaluation and frame budget scheduling mechanisms are introduced, the problems of loading delay and resource redundant transmission are avoided, and the real-time loading efficiency and rendering fluency under the large-scale three-dimensional level scene are improved.

The invention relates to the technical field of data processing, and provides a quick switching method and system for displaying PDF document images in multiple windows. The method comprises the following steps: searching an associated drawing set according to a reference drawing; performing multivariate correlation analysis, and constructing a PDF index map; extracting a root node drawing, and displaying the root node drawing in a main window according to a reference scale; according to an interaction behavior of a user on the root node, positioning the associated sub-graph and updating main window display; splitting a new index graph taking the associated sub-graph as a root node; positioning a switching target in the new map according to the dynamic interaction behavior of the user; and controlling linkage proportional loading of the K secondary windows according to the target association features. The technical problems that a user needs to manually retrieve associated drawings and the switching efficiency is low due to the fact that traditional multi-window engineering drawing browsing lacks semantic association analysis are solved, and the technical effects that rapid drawing switching and dynamic display updating based on the PDF index graph are achieved, the user interaction experience is improved, and the drawing information association is enhanced are achieved.

The invention relates to the field of antenna welding devices, in particular to an RFID antenna tail end pin welding device which comprises a bottom plate, a welding gun arranged on the upper side of the bottom plate, a center column fixedly installed in the center of the upper side of the bottom plate, a transposition mechanism used for rapidly switching welding point positions and a correcting mechanism used for correcting the tail end of an antenna. The rotating base plate, the discharging base and the pushing assembly in the transposition mechanism are matched, circumferential rotation of the rotating base plate is matched with radial sliding of the discharging base, the discharging base drives a circuit board on the discharging base to slide once every time the rotating base plate rotates by a circle, and therefore automatic switching of welding point positions is achieved; the clamping plate, the pressing wheel and the wedge-shaped piece in the correcting mechanism are adopted, the wedge-shaped piece triggers the moving assembly to drive the clamping plate to clamp and straighten the tail end of the antenna, meanwhile, the pressing wheel downwards presses the tail end of the antenna, the problem of insufficient soldering or poor contact caused by antenna bending in the welding process is effectively solved, and the welding quality is ensured.

The invention provides a multi-serial-port intelligent switching method and system and a storage medium, and relates to the technical field of servers. The method comprises the following steps: initializing serial port configuration of the embedded equipment, and connecting default output of the embedded equipment to a public serial port; receiving a serial port data stream input by a user terminal through the public serial port; monitoring whether the data stream contains predefined special switching characters or not in real time through character detection logic; when the special switching character is monitored, analyzing the special switching character to determine a channel number of a target CPU serial port based on a predefined rule; dynamically switching the output of the public serial port to a logic channel corresponding to the target CPU serial port through serial port switching logic according to the channel number; and outputting the identification information of the currently connected CPU serial port to the user terminal to complete the switching operation. According to the method, the operation process is simplified, rapid switching among different serial ports is realized, and the operation efficiency and the user experience are improved.

The utility model discloses an integrated test control system of a power module. The integrated test control system comprises an NTC test loop and an insulation test loop. The system also comprises a change-over switch. The insulation voltage-withstanding tester passes through the NTC test loop and then leads out an NTC test terminal. An insulation test terminal is led out from the insulation voltage-withstanding tester through an insulation test loop; and the insulation test terminal and the NTC test terminal are respectively connected to the test end of the power module to be tested through the change-over switch. Compared with the prior art, the testing device has the advantages that two testing procedures are integrated together, different testing procedures can be rapidly switched through the change-over switch, NTC testing and insulation testing can be rapidly completed, testing efficiency is improved, the procedures of insulation testing and NTC isolation testing are simplified, and operation efficiency is improved.

The invention provides a battery shell defect detection system, method and equipment and a medium. The system comprises a movable clamping jig, a camera and a processor. The method comprises the following steps: selecting a target jig from an internal inspection jig and an external inspection jig according to models; the clamping width of the target jig is adjusted according to the model; selecting a target detection station and a target detection model according to the model; feeding the battery shell to a target clamp, enabling the target clamp to move to a target detection station, and carrying out defect detection on the battery shell according to the target detection model to obtain a defect detection result; the clamping jig and the detection model can be rapidly switched according to the detection modes of different types of battery shells, and the detection efficiency is improved.

The invention discloses a multi-protocol fusion VPN (Virtual Private Network) communication method and system based on dynamic tunnel switching, and relates to the technical field of computer network communication. According to the method, collection points are respectively arranged at an inlet and an outlet of a VPN, and a time synchronization timer, a data packet capture probe and a protocol analysis tool are utilized; the method comprises the following steps: accurately acquiring control instruction time delay Delay trl, control instruction packet loss rate Lossctrl, burst packet loss rate Burst and common flow delay variance VarDelay data, introducing a priority label into a VPN protocol encapsulation layer, marking a control instruction data flow as a first priority and binding the control instruction data flow to a rapid switching tunnel, marking a common monitoring data flow as a second priority and binding the common monitoring data flow to a conventional tunnel, and performing data transmission on the control instruction data flow and the common monitoring data flow; and differential transmission guarantee for different types of traffic is realized. After the method is optimized, it can be guaranteed that the key control instruction is not interfered by common flow in the network fluctuation or tunnel switching process, and the real-time performance and transmission reliability of the control instruction are remarkably improved.

In a current drive type display device of a variable refresh rate system such as an organic EL display device, an on-bias voltage line for supplying an on-bias voltage Vobs to be applied to a driving transistor in a pixel circuit is provided in a display portion in order to reduce an influence of a hysteresis characteristic of the driving transistor on display luminance. Therefore, when an operation mode is switched from the low refresh mode to the high refresh mode, among pixel circuits in the same column connected to the same data signal line, a pixel circuit to which data is written and a pixel circuit to which the on-bias voltage is applied can be mixed. This enables quick switching from the low refresh rate to the high refresh rate.