LED driving chip

Abstract

The utility model discloses an LED driving chip, comprising a power supply module comprising a plurality of power supply ends and a ground signal end, the power supply ends respectively supplying power for red, green and blue LED lamps; and the input and output module comprises a signal input end and a signal output end, the signal input end is used for receiving an external control signal, and the signal output end is used for driving external equipment and realizing signal cascade transmission of a plurality of chips. According to the utility model, through the function design of line and column integration and the high integration of the high-precision constant-current driving module, the low-gray correction module, the dynamic energy-saving module, the error detection processing unit and other modules, the low-gray display effect, the power consumption management, the display reliability, the refresh rate and the gray level performance are comprehensively optimized, the circuit structure is simplified, and the cost is reduced. The method is suitable for various application scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to LED display technical field, concretely relates to a LED drive chip. BACKGROUND

[0002] With the rapid development of LED display technology, LED display screens have been widely used in outdoor advertising, indoor decoration, consumer electronic devices, household appliances and smart sound boxes and other scenes. Compared with traditional display technology, LED display screens have the advantages of high brightness, high contrast, energy saving and environmental protection, long service life and the like. However, in the existing LED display driving chip technology, the following technical problems still exist:

[0003] In the LED display screen, the low gray scale display effect is crucial for color restoration and picture detail performance, however, the existing LED driving chip is prone to problems such as uneven gray scale, flicker or overdarkness when processing low gray scale, resulting in a decline in image quality;

[0004] With the continuous improvement of the resolution of LED display screens, the number of LED lamp beads increases, and the power consumption problem of the driving chip is increasingly prominent, and the existing technology cannot effectively reduce the power consumption while maintaining brightness and display effect, especially when the display screen is black or displays part of the static image, unnecessary energy consumption still exists;

[0005] In actual use, the LED display screen may cause display abnormalities due to open circuit or short circuit problems of the lamp bead, such as high-brightness cross and ghost phenomenon, and the error detection and repair capability of the existing driving chip is insufficient, which may affect the overall display effect and shorten the service life of the LED lamp bead;

[0006] The current LED driving chip has limited performance in high gray scale level and high refresh rate display, especially when displaying fast dynamic pictures, it may appear trailing or flickering, which cannot meet the demand of high-quality display;

[0007] The existing LED driving chip usually separates the row control and column control, which increases the circuit complexity, occupies more space and limits the small pitch design of the display screen, in addition, the functional modules of the chip are scattered, lack of integrated design, and it is difficult to meet the requirements of small size and high integration of consumer electronic devices. UTILITY MODEL CONTENTS

[0008] In order to solve the above problems, the utility model provides a LED drive chip, which can significantly improve the display quality, reliability and service life of the LED display screen, and provides a new solution for the development of LED display technology.

[0009] The utility model is realized through the following technical schemes: a LED drive chip, comprising:

[0010] The power supply module includes a plurality of power supply terminals and ground signal terminals, and the power supply terminals are respectively used for supplying power for red, green and blue LED lamps;

[0011] The input and output module includes a signal input terminal and a signal output terminal, the signal input terminal is used for receiving an external control signal, the signal output terminal is used for driving an external device, and signal cascade transmission of a plurality of chips is realized.

[0012] The data command processing unit includes an SRAM storage module and a control logic, and is used for storing and processing low gray correction data and operation commands of the driving chip.

[0013] The image processing unit is electrically connected with the data command processing unit, is used for receiving data commands and generating row control signals and current control signals.

[0014] The row control unit includes a plurality of row channel output terminals and a control signal input terminal, the row channel output terminals are connected to row circuits of LED lamp beads, and the control signal input terminal is used for receiving row control signals of the image processing unit.

[0015] The high-precision constant current driving unit includes a plurality of current output terminals, is connected with column circuits of LED lamp beads, is used for providing constant current for the LED lamp beads, and supports multi-gray compensation function to optimize display effect.

[0016] The dynamic energy-saving processing module is electrically connected with the power supply module and the high-precision constant current driving unit, is used for dynamically adjusting power supply according to a black screen state, reducing chip power consumption and prolonging LED service life.

[0017] The low gray correction processing module is electrically connected with the image processing unit, is used for correcting low gray display, and improves low gray display effect of the LED.

[0018] The error detection processing unit is electrically connected with the image processing unit and the row control unit, is used for detecting and repairing open-circuit faults of the LED lamp beads, and prevents display abnormalities.

[0019] As a preferred technical solution, the power supply module adopts a common negative design to reduce power consumption and optimize chip circuit layout.

[0020] As a preferred technical solution, the signal input terminal of the input and output module is connected in cascade with a plurality of chips.

[0021] As a preferred technical solution, the image processing unit receives an external control signal through a clock signal terminal and a latch signal terminal, and is used for synchronizing data shift and generation of row control signals.

[0022] As a preferred technical solution, the row control unit includes 16 row channel output terminals, and is used for controlling on-off states of 1-16 row LED lamp beads respectively.

[0023] As a preferred technical solution, the high-precision constant current driving unit comprises 48 constant current output ends, supports PWM signal control, and improves the refresh rate of the display screen through DLL frequency multiplication technology.

[0024] The LED driving chip has the advantages that: the LED driving chip is high in integration of a function design of combination of rows and columns, a high-precision constant current driving module, a low-gray correction module, a dynamic energy-saving module and an error detection processing unit, and is capable of optimizing low-gray display effect, power consumption management, display reliability, refresh rate and gray scale performance, simplifying circuit structure, and being suitable for various application scenarios, including outdoor or indoor LED display screens, consumer electronic devices, household appliances and the like. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0026] Figure 1 The system block diagram of the present application;

[0027] Figure 2 The circuit principle diagram of the present application. DETAILED DESCRIPTION

[0028] All features disclosed in this specification, or all steps of any methods or processes disclosed, can be combined in any manner, except where features or steps are mutually exclusive.

[0029] Any feature disclosed in this specification, unless stated otherwise, can be replaced by an alternative feature serving the same, or a similar, purpose. That is, unless stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

[0030] As Figure 1 and Figure 2As shown, the LED driving chip of the utility model, the chip integrates multiple function modules, realizes the efficient drive and accurate control of LED display screen through the design of high integration. The chip includes power supply module, input and output module, data command processing unit, image processing unit, line control unit, high-precision constant current drive unit, dynamic energy saving processing module, low gray correction processing module and error detection processing unit, each module is connected and cooperates, realizes the optimization control of LED display screen.

[0031] The power supply module provides working power supply for the chip, including multiple power supply ends and ground signal ends, wherein the power supply ends are respectively used for power supply of red, green and blue LED lamps. The module adopts common negative design, reduces power consumption in the circuit by sharing ground signal, and improves the energy efficiency of the chip.

[0032] Specifically, the power supply end includes VLEDR, VLEDG and VLEDB pins, which are respectively connected to the power supply circuit of red, green and blue lamps, and the ground signal end (GND) provides stable reference voltage for the whole chip, ensuring reliable operation of the power supply system.

[0033] The input and output module is used for realizing receiving of external signals and cascade transmission between chips, and the module includes signal input end and signal output end. The signal input end receives control signals from the outside through DINR, DING and DINB pins, and the signal output end transmits the processed signals to subsequent devices or other cascade chips through DOUTR, DOUTG and DOUTB pins. Through this design, multiple chips can work in series, so as to control more LED lamp beads and expand the control range of the display screen. In addition, the input and output module also includes OUTR0-OUTR15, OUTG0-OUTG15 and OUTB0-OUTB5 pins, which directly drive LED lamp beads to realize real-time transmission and response of signals.

[0034] The data command processing unit is mainly composed of SRAM storage module and control logic, and is used for storing and processing low gray correction data and operation commands of the driving chip.

[0035] The SRAM storage module is used for saving important parameters between some registers, including low gray correction data and display control parameters, and provides data support for subsequent image processing and driving. The module can read and write data in an efficient way, so as to realize fast response.

[0036] The image processing unit is electrically connected with the data command processing unit, for receiving commands and generating row control signals and current control signals, the unit shifts data through the clock data pin (DCLK), latches the transmitted command data through the latch signal pin (LATCH), and generates control signals according to the command data. The design of the image processing unit can identify the length of the LATCH signal, thereby distinguishing different commands, and ensuring accurate control of the row circuit and the column circuit.

[0037] The row control unit includes a plurality of row channel output ends and a control signal input end, wherein the row channel output ends are connected to the row circuit of the LED lamp beads for controlling the conduction state of each row of LED lamp beads, the control signal input end of the unit receives the row control signals from the image processing unit, and through a plurality of row channels (such as LINE0 to LINE15), the module can accurately control the switching state of the LED lamp beads in a high-speed and accurate manner.

[0038] The high-precision constant current driving unit includes a plurality of current output ends, which are connected to the column circuit of the LED lamp beads for providing stable constant current, the unit supports a variety of gray scale compensation mechanisms, including PWM control and DLL frequency multiplication technology, to improve the refresh rate and gray scale level of the display screen, by adopting 48-way constant current output, the module can ensure the brightness consistency and color restoration degree of the LED lamp beads, thereby optimizing the overall display effect of the display screen.

[0039] The dynamic energy-saving processing module is electrically connected with the power supply module and the high-precision constant current driving unit, for dynamically adjusting the power supply according to the black screen state, by detecting the image content of the display screen, when the screen is in a black screen or partially closed state, the module can close unnecessary power supply paths, thereby reducing the chip power consumption. In addition, the module can also effectively reduce the surface temperature of the LED lamp beads, thereby prolonging the service life thereof.

[0040] The low gray correction processing module is electrically connected with the image processing unit, for accurately correcting low gray display, by increasing the low gray correction accuracy of 12 bits, the module significantly improves the display effect of the LED lamp beads under low brightness, avoids the problem of uneven gray scale or flicker, thereby enhancing the image quality and detail performance of the display screen.

[0041] The error detection processing unit is electrically connected with the image processing unit and the row control unit, for detecting and repairing open circuit faults of the LED lamp beads, the unit controls the discharge time and data output time of the row circuit through the built-in blanking module, thereby avoiding the ghosting phenomenon in display, at the same time, the module also has the open circuit detection function, which can effectively eliminate the "high-brightness cross" problem, protect the LED lamp beads from damage by reverse voltage, and improve the reliability of the display screen.

[0042] In the above embodiments, through the high integration and optimized design of each module, the LED driving chip realizes the function of row and column in one, significantly improves the display effect, power consumption management ability and system reliability, and simultaneously supports the design requirement of small pitch display screen. The chip adopts a QFN80 packaging form, and is suitable for various application scenarios, including outdoor or indoor LED display, LED backlight of consumer electronic equipment and display application of smart home appliances.

[0043] The above merely describes the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any change or replacement without creative labor should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be limited by the protection scope defined in the claims.

Claims

1. An LED driver chip, characterized in that, The application relates to a high-precision constant-current driving chip for LED display screen, which comprises the following parts: a power supply module, which comprises a plurality of power supply ends and ground signal ends, and the power supply ends are respectively used for supplying power for red, green and blue LED lamps; an input and output module, which comprises a signal input end and a signal output end, the signal input end is used for receiving external control signals, the signal output end is used for driving external devices, and signal cascade transmission of a plurality of chips is realized; a data command processing unit, which comprises an SRAM storage module and control logic, and is used for storing and processing low-gray correction data and operation commands of the driving chip; an image processing unit, which is electrically connected with the data command processing unit, is used for receiving data commands and generating row control signals and current control signals; a row control unit, which comprises a plurality of row channel output ends and a control signal input end, the row channel output ends are connected to row circuits of LED lamp beads, and the control signal input end is used for receiving row control signals of the image processing unit; a high-precision constant-current driving unit, which comprises a plurality of current output ends and is connected with column circuits of the LED lamp beads, is used for providing constant current for the LED lamp beads and supporting multi-gray compensation function to optimize display effect; a dynamic energy-saving processing module, which is electrically connected with the power supply module and the high-precision constant-current driving unit, is used for dynamically adjusting power supply according to a black screen state, reducing chip power consumption and prolonging the service life of the LED; a low-gray correction processing module, which is electrically connected with the image processing unit, is used for correcting low-gray display and improving the low-gray display effect of the LED; an error detection processing unit, which is electrically connected with the image processing unit and the row control unit, is used for detecting and repairing open-circuit faults of the LED lamp beads and preventing display abnormities.

2. The LED driver chip of claim 1, wherein: The power supply module adopts a common cathode design to reduce power consumption and optimize chip circuit layout.

3. The LED driver chip of claim 1, wherein: The signal input end of the input and output module is connected with a plurality of chips in cascade.

4. The LED driver chip of claim 1, wherein: The image processing unit receives external control signals through a clock signal end and a latch signal end, and is used for synchronizing data shift and generation of row control signals.

5. The LED driver chip of claim 1, wherein: The row control unit comprises 16 row channel output ends and is used for controlling the conduction states of 16 rows of LED lamp beads.

6. The LED driver chip of claim 1, wherein: The high-precision constant-current driving unit comprises 48 constant-current output ends, supports PWM signal control, and improves the refresh rate of the display screen through DLL frequency multiplication technology.

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