The invention discloses an LED display device and a driving method thereof. The method comprises the following steps: generating gray scale data according to a display image; adjusting the sequence ofthe plurality of display intervals in the display row according to the gray scale data; generating a PWM signal, a pull-up control signal and a pull-down control signal according to the gray scale data; controlling on and off of an LED lamp according to the PWM sub-signals; wherein the display intervals further comprise pull-up time, pull-down time and pull-up waiting time, the length of the pull-up waiting time is adjusted according to the display current in the data display time, and each display interval can be independently controlled. According to the LED display device and the driving method thereof, the pull-up waiting time can be adjusted according to the magnitude of the display current, the display effect is improved, the display intervals can be turned on or turned off or combined, power consumption is reduced, meanwhile, the multiple display intervals are displayed in a certain sequence, and high-contrast interference and cross-plate chromatic aberration are reduced.

LED display device and driving method thereof

The invention relates to the technical field of the control of a light-emitting diode (LED) lamp, and provides an LED constant current driving circuit, a driving chip and a control method of the driving chip. The control method of the driving chip comprises the following steps of: judging whether a data frame is received or not, if yes, executing a step of extracting corresponding display data of the level from the received data frame and controlling the LED lamp to display according to the acquired display data of the level; and if not, generating display data according to a built-in effect algorithm, acquiring the display data of the level from the generated display data, and controlling the LED lamp to display according to the acquired display data of the level; judging whether the driving chip works in an external controller control state or a built-in display effect control state or not according to the received data frame, subsequently and automatically switching the driving chip into the built-in display effect state when external data is not received. Therefore, most driving chips of the series display system are ensured to work at display states, and subsequent maintenance is facilitated or reduced.

Light-emitting diode (LED) constant current driving circuit, driving chip and control method of driving chip

The embodiment of the invention provides a stroboscopic-free LED lighting circuit which comprises an LED lamp set module, a work voltage keeping module, a constant-current control module and a control unit. The LED lamp set module is divided into a plurality of dynamic matrixes, the constant-current control module is controlled by the control unit to turn on or turn off corresponding LED lamp sets and control current of the corresponding LED lamp sets to be constant, and the control unit can control the constant-current control module to achieve switching between the dynamic matrixes according to voltage change of an input line network. The embodiment of the invention further provides a device with the lighting circuit. According to the stroboscopic-free LED lighting circuit and the device, the constant-current control module is controlled by the control unit to achieve the purpose of turning on or turning off the different LED lamp sets according to the voltage change of the input line network. Furthermore, the output power of LED lamps can be kept constant in different time periods by controlling the output current of the turned-on LED lamp sets, the luminous flux output can be kept constant, and the stroboscopic-free requirement can be met.

Stroboscopic-free LED lighting circuit and device

The invention belongs to the field of constant-current driving and provides a constant-current driving circuit. A current pre-opening technology is adopted in the constant-current driving circuit; parasitic capacitance is provided instantaneously when the circuit is opened, and flows through an electric energy discharging channel of a power switch pipe Q2, so that the voltage of an output current port of the constant-current driving circuit is quickly reduced to be output when load is completely conducted, the load quickly enters a complete conduction state, and the difference value between the effective conduction time of the load and the effective level time of an enable control signal is greatly shortened; when the load is an LED (light-emitting diode), the corresponding brightness deflection between the practical brightness of the load and set value output by an LED display screen controller is reduced, the displaying effect is optimized, and the user experience is improved.

Constant-current driving circuit

LED display panel, system and equipment

The invention relates to the technical field of LED lamp control and provides a series-connection display system and a data transmission method thereof. The data transmission method includes that a first driving chip receives a data frame formed by n groups of display data and one group of shared control data; starting from the first driving chip, the first driving chip extracts the display data and the shared control data at the corresponding level and corresponding to the first driving chip from the data frame, a data frame formed by the shared control data and the rest display data is sent to a second driving chip, and execution till an nth driving chip is performed sequentially according to a level-to-level series connection mode; in the process of sequentially executing till the nth driving chip according to the level-to-level series connection mode, each driving chip controls an LED lamp connected with the corresponding driving chip for display according to the display data and the shared control data at the corresponding level and corresponding to each driving chip. the control data which are identical are used, and the control data need to be transmitted for only once, so that identical control functions of series-connection driving chips are realized on the basis that number of cascaded chips of a series-connection system is not reduced.

Series-connection display system and data transmission method thereof

The invention belongs to the technical field of landscape decorative lamp control and provides a landscape decorative lamp system and an address coding and display control method of the landscape decorative lamp system. A plurality of display modules comprising master control modules are adopted by the landscape decorative lamp system; display data are obtained from a controller by the display modules in a parallel connection mode; address coding operation is conducted on the display modules at a time in a series connection step-by-step transmission mode; if the master control module in one display module fails, the master control modules in the other display modules can normally conduct corresponding display according to stored address coding data and the display data obtained from the controller, so that the problem that when series connection step-by-step transmission is conducted on the received display data by an existing landscape decorative lamp system, due to driver chips of one or more decorative lamps fail, the following decorative lamps cannot normally work is solved.

Landscape decorative lamp system and address coding and display control method thereof

The invention provides an LED display panel driving method, device, display system and equipment, which are applicable to the field of LED display. The method comprises the following steps of: multiplexing driving ports as scanning ends and data switching ends; during scanning, using partial or all driving ports as the scanning ends in turn; using the rest part of or the rest all driving ports as the data switching ends; selecting LED lamps with anodes/cathodes connected to the scanning ends; and selectively lightening LED lamps with cathodes/anodes connected to the data switching ends. According to the invention, the driving ports are multiplexed into the scanning ends and the data switching ends; independent K*(K-1) LED lamp lattice array display can be achieved by K driving ports, so that a purpose of driving more LED lamp lattice arrays by using less driving ports is achieved, the utilization rate of the driving ports is greatly increased, the realization method is simple and low cost is achieved.

LED display panel driving method, device, display system and equipment

The invention belongs to the technical field of display control and provides a display control method and a display control system both supportive of gray level expansion The method and the system are characterized in that in a synchronous control card, each to-be-displayed gray datum with display accuracy of n1 is processed to acquire a group of gray data, with the display accuracy of n2 respectively, corresponding to each to-be-displayed gray datum, n2 is equal to or smaller than n1 and n2 is smaller than 16, and in 2n1 gray clock signal cycles, duty ratio represented by a group of gray data with the display accuracy of n2 respectively is identical with that needed to be demonstrated by the to-be-demonstrated gray data with the display accuracy of n1 By the method, data transmission quantity between the synchronous control card and a driving chip is lowered to n2 digits from 16 digits currently, so that data transmission rate between the synchronous control card and the driving chip is increased by 16/n2 times, the frequency upper limit of gray clock signals is improved, line scanning frequency is increased, and image refreshing rate is increased

Display control method and display control system both supportive of gray level expansion

The utility model is applicable to the field of LED (light emitting diode) display and provides an LED display panel driving device, a display system and equipment. The device comprises a plurality of driving units, an LED lamp and a data switch control unit, wherein each driving unit comprises a driving module and a driving port corresponding to the driving module, the driving port is multiplexed as a scanning end and a data switch end, the LED lamp is connected with the driving unit, sequentially uses partial or all driving ports as the scanning ends and controls positive electrodes/negative electrodes selected by the driving units to be connected to the scanning ends, the selectively illumined positive electrodes/negative electrodes are connected to a scanning control unit of the LED lamp of the data switch end, and the data switch control unit is respectively connected with the driving unit and the scanning control unit, sets all the rest driving ports or the rest parts except the scanning ends as data switch ends, reads display data according to scanning control signals of the scanning control unit and provides the display data for corresponding driving units.

LED (light emitting diode) display panel driving device, display system and equipment

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