Static driving chip for LED display screen

Abstract

The utility model discloses a static driving chip for an LED display screen, and the chip comprises a chip power supply module which is used for providing a working power supply for the whole chip and comprises a VDD power pin and a GND ground signal pin; the LED power supply module provides independent power supplies for the red lamp, the green lamp and the blue lamp and comprises a VLEDR red lamp power supply pin, a VLEDG green lamp power supply pin, a VLEDB blue lamp power supply pin and a signal input and output processing module, the signal input and output processing module receives serial input data through DINR, DING and DINB signal input pins and outputs signals through DOUTR, DOUTG and DOUTB signal output pins, and the signal input and output processing module outputs the serial input data through the DINR, DING and DINB signal input pins. And chip cascade transmission is realized. According to the utility model, the static design below P1.95 (including P1.95) can be met, so that the problem of a shooting scanning line of a roller shutter camera is solved, and better movies or televisions can be shown in extremely low-gray shooting in the movie and television industry.

Description

Technical Field

[0001] This utility model relates to a static driver chip, specifically a static driver chip for LED displays. Background Technology

[0002] With the rapid development of LED display technology, the market demands increasingly higher display effects, especially in high-standard applications such as film, television, XR (extended reality), and VP (virtual photography). The performance of LED displays directly affects the final image quality. To meet the needs of these fields, the pixel pitch of LED displays is constantly decreasing, and small-pitch LED displays are gradually becoming the mainstream in the market. However, small-pitch LED displays often encounter scan line problems caused by rolling shutter cameras during shooting, affecting image quality and failing to meet high-precision shooting requirements.

[0003] Most LED driver chips on the market currently employ a dynamic design, driving LED beads through time-division scanning. While this method reduces chip power consumption to some extent, the intermittent lighting of the LED beads can easily lead to flickering or scan lines in fast-moving scenes or high refresh rate photography, severely impacting display quality, especially under low grayscale conditions where image quality degrades significantly. Furthermore, existing LED driver chips generally suffer from poor grayscale performance, high power consumption, and insufficient brightness uniformity, failing to meet high-standard display requirements.

[0004] On the other hand, with increasing awareness of energy conservation and environmental protection, how to reduce the power consumption of LED displays and extend the lifespan of LED chips without compromising display quality has become an urgent problem to be solved. Meanwhile, existing LED display driver chips often lack methods for detecting open-circuit faults in LED chips, which can lead to a "high-brightness cross" phenomenon when a chip fails, affecting the overall display effect. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a static driver chip for LED displays. Employing a static design, it provides independent low-voltage power to red, green, and blue LEDs via a common-cathode power supply mode. This effectively reduces power consumption and LED surface temperature. Furthermore, it integrates open-circuit detection and a dynamic energy-saving module. This not only ensures high grayscale and high refresh rate, resolving scan line issues during rolling shutter camera shooting, but also avoids display anomalies caused by open-circuit faults, significantly improving display quality and device reliability. It is suitable for LED displays in high-standard application fields.

[0006] This utility model is achieved through the following technical solution: a static driver chip for LED displays, the chip comprising:

[0007] The chip power supply module is used to provide operating power to the entire chip, including the VDD power supply pin and the GND ground signal pin;

[0008] The LED power supply module provides independent power for red, green and blue lights, including VLEDR (red light power supply pin), VLEDG (green light power supply pin), and VLEDB (blue light power supply pin).

[0009] The signal input / output processing module receives serial input data through DINR, DING, and DINB signal input pins, and outputs signals through DOUTR, DOUTG, and DOUTB signal output pins, thereby realizing chip cascade transmission.

[0010] A data processing unit, which is electrically connected to the signal input / output processing module, is used to receive and process input data and control the display state of the LED;

[0011] An image processing unit, which is electrically connected to a data processing unit, is used to process image data and control the image display effect of the LED display screen.

[0012] An open circuit detection module, which is electrically connected to the image processing unit, is used to detect and eliminate open circuit problems of LED beads to avoid the phenomenon of high-brightness crosses.

[0013] A dynamic energy-saving processing module, which is electrically connected to the data processing unit, is used to reduce the temperature of the LED display screen by reducing useless power consumption, thereby extending the service life of the LED display screen.

[0014] A high-precision current output channel is electrically connected to the image processing unit and is used to output 192 channels of high-precision constant current to achieve color restoration through grayscale compensation.

[0015] The SRAM storage unit is electrically connected to the data processing unit and is used to store display data and support high frame rate input.

[0016] As a preferred technical solution, the signal input / output processing module receives clock and command signals through the clock data pin DCLK and the data latch signal pin LATCH to control the timing of data transmission.

[0017] As a preferred technical solution, the LED power supply module's VLEDR, VLEDG, and VLEDB provide low-voltage power to the red, green, and blue lights, respectively.

[0018] As a preferred technical solution, the high-precision current output channel adopts a PWM grayscale dispersion method.

[0019] As a preferred technical solution, the chip is packaged using the BGA method.

[0020] The beneficial effects of this utility model are: by adopting a common cathode power supply scheme, this LED display static driver chip realizes independent low-voltage power supply for red, green and blue lights, effectively reduces useless power consumption, significantly reduces the surface temperature of the LED display, and thus extends the service life of the display.

[0021] The chip integrates a high-precision current output channel, which can improve the display grayscale level and refresh rate through grayscale compensation and PWM grayscale dispersion, ensuring good display effect even at extremely low grayscale. It is especially suitable for LED displays below P1.95 and effectively solves the scan line problem that occurs when shooting with a rolling shutter camera.

[0022] In addition, the chip also has an open circuit detection function, which can promptly eliminate open circuit problems of LED beads, prevent the high-brightness cross phenomenon, and ensure the normal operation of the display screen;

[0023] The built-in dynamic energy-saving module not only reduces power consumption but also improves energy-saving performance, meeting current energy-saving and environmental protection requirements;

[0024] Meanwhile, the integrated 6K SRAM memory unit significantly reduces memory usage during static display and supports high frame rate input of up to 240Hz, providing an ideal solution for smaller pitch designs in the display industry and meeting the requirements for high-standard shooting quality, especially suitable for the film and television industry. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a system block diagram of the present invention;

[0027] Figure 2 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0028] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0029] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0030] like Figure 1 and Figure 2 As shown, this utility model discloses a static driver chip for an LED display screen, the chip comprising:

[0031] The chip power supply module provides a stable operating power supply for the normal operation of the entire chip, and includes a VDD power pin and a GND ground pin. The VDD power pin receives external power and provides operating voltage to the various modules inside the chip. The GND pin provides a ground signal, ensuring a stable current loop for the entire chip and preventing noise interference and power instability. This module ensures the long-term operational stability of the chip and provides the necessary power support for each functional module.

[0032] The LED power supply module provides independent power for red, green, and blue LEDs, specifically through the three pins VLEDR, VLEDG, and VLEDB. VLEDR provides low-voltage power to the red LED, VLEDG to the green LED, and VLEDB to the blue LED. This independent power supply allows for precise control of the brightness of each color and reduces current interference between different colors, resulting in better color reproduction and brightness consistency for the LED display. Furthermore, this power supply design utilizes a common cathode structure, significantly reducing power consumption and improving energy efficiency.

[0033] The signal input / output processing module is responsible for receiving and outputting signals related to display control. This module receives serial input data from external sources through three signal input pins: DINR, DING, and DINB. It controls the data sampling time through the clock data pin DCLK to ensure correct data transmission timing. The data latch signal pin LATCH is used to latch the input data, and the processed signals are output through three signal output pins: DOUTR, DOUTG, and DOUTB, enabling cascaded signal transmission between chips. This module's design ensures the scalability of the chips in large-scale LED displays, allowing multiple chips to be cascaded to drive large-area LED displays while maintaining the consistency and synchronization of the displayed content.

[0034] The data processing unit is the core processing module inside the chip. It receives input data from the signal input / output processing module, parses and processes this data, and generates control signals to control the on / off state of the LED display's LED beads. The data processing unit not only achieves efficient data processing but also calibrates and adjusts the input data to ensure that the LED display's brightness, grayscale level, and response speed meet high standards. This module also works in conjunction with the SRAM storage unit to effectively reduce data transmission latency and improve the real-time performance of the display.

[0035] The image processing unit is electrically connected to the data processing unit and is responsible for processing data related to the displayed image. This module can optimize image data, including color compensation, grayscale adjustment, and dynamic response time optimization, ensuring that the LED display can present high-quality image effects. The image processing unit also has multiple display modes to adapt to different application scenarios and meet market requirements for high refresh rates and high grayscale levels, making it particularly suitable for industries such as film and television, which have extremely high requirements for display effects.

[0036] The open-circuit detection module monitors the operating status of LED beads in real time, enabling timely detection and handling of open-circuit faults. When an LED bead exhibits an open-circuit fault, the module can quickly isolate the faulty bead, preventing it from adversely affecting the display effect. It eliminates the "open-circuit cross" effect, avoiding the high-brightness cross caused by open-circuit damage. It also protects the LEDs from damage due to excessive reverse voltage. Furthermore, the module features reverse voltage protection, preventing damage to the LED beads from excessive reverse voltage, thereby further extending the lifespan of the LED display and improving its reliability.

[0037] The dynamic energy-saving module is a functional module designed to address the energy consumption issues of LED displays. This module monitors the operating status of the LED display in real time and intelligently adjusts the operating current of the LED chips without affecting the display effect, reducing unnecessary energy consumption. By optimizing power supply and reducing power loss, this module can effectively lower the surface temperature of the LED display, reduce heat dissipation requirements, extend the lifespan of the LED chips, and significantly improve the overall energy-saving effect of the display.

[0038] The high-precision current output channel outputs 192 channels of high-precision constant current and achieves color reproduction through grayscale compensation. The core advantage of this module lies in its ability to intelligently adjust the output current based on changes in image data, ensuring that each LED bead maintains consistent brightness and color. Simultaneously, the module employs PWM (Pulse Width Modulation) grayscale dispersion technology, significantly improving the grayscale level and refresh rate of the LED display screen, guaranteeing high-quality image display even under low grayscale conditions, making it particularly suitable for the high-standard shooting requirements of industries such as film and television.

[0039] SRAM memory cells are responsible for storing display data and working in conjunction with the data processing unit. Because this chip employs a static display design, the SRAM memory cells effectively reduce data storage and transmission latency, ensuring smooth data transfer under high frame rate input, supporting input frame rates up to 240Hz. Furthermore, the static storage characteristics of SRAM enable it to maintain efficient operation at low power consumption, further improving the overall performance and stability of the chip.

[0040] The signal input / output processing module controls data timing through the clock data pin DCLK and the data latch signal pin LATCH. DCLK samples input data on the rising edge to ensure the accuracy of data transmission; LATCH is used to latch the input data at the current timing, enabling the chip to perform data switching and latching operations at specific timing points to ensure the integrity and consistency of the displayed content.

[0041] The LED power supply module provides low-voltage power to the red, green, and blue LEDs via VLEDR, VLEDG, and VLEDB respectively. Low-voltage power supply not only reduces power consumption in the circuit but also reduces heat generation from the LED chips, improving the energy efficiency of the LED display and extending its lifespan.

[0042] In this embodiment, the high-precision current output channel adopts the PWM grayscale dispersion method, which controls the brightness of the LED beads by adjusting the time ratio of the pulse width, thereby achieving more precise grayscale control and improving the grayscale level of the LED display screen. In particular, it can present a smoother and more natural brightness change under low grayscale.

[0043] This chip is packaged using a BGA (Ball Grid Array) package, which offers superior thermal conductivity and electrical performance, making it suitable for high-density chip packaging. Its small size, high pin count, excellent heat dissipation, and mechanical strength ensure efficient operation in complex LED display systems, while also enhancing the chip's anti-interference capabilities and durability.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A static driver chip for an LED display screen, characterized in that, The chip includes: The chip power supply module is used to provide operating power to the entire chip, including the VDD power supply pin and the GND ground signal pin; The LED power supply module provides independent power for red, green and blue lights, including VLEDR (red light power supply pin), VLEDG (green light power supply pin), and VLEDB (blue light power supply pin). The signal input / output processing module receives serial input data through DINR, DING, and DINB signal input pins, and outputs signals through DOUTR, DOUTG, and DOUTB signal output pins, thereby realizing chip cascade transmission. A data processing unit, which is electrically connected to the signal input / output processing module, is used to receive and process input data and control the display state of the LED; An image processing unit, which is electrically connected to a data processing unit, is used to process image data and control the image display effect of the LED display screen. An open circuit detection module, which is electrically connected to the image processing unit, is used to detect and eliminate open circuit problems of LED beads to avoid the phenomenon of high-brightness crosses. A dynamic energy-saving processing module, which is electrically connected to the data processing unit, is used to reduce the temperature of the LED display screen by reducing useless power consumption, thereby extending the service life of the LED display screen. A high-precision current output channel is electrically connected to the image processing unit and is used to output 192 channels of high-precision constant current to achieve color restoration through grayscale compensation. The SRAM storage unit is electrically connected to the data processing unit and is used to store display data and support high frame rate input.

2. The static driver chip for LED displays according to claim 1, characterized in that: The signal input / output processing module receives clock and command signals through the clock data pin DCLK and the data latch signal pin LATCH to control the timing of data transmission.

3. The static driver chip for LED displays according to claim 1, characterized in that: The LED power supply module's VLEDR, VLEDG, and VLEDB provide low-voltage power to the red, green, and blue lights, respectively.

4. The static driver chip for LED displays according to claim 1, characterized in that: The high-precision current output channel adopts a PWM grayscale dispersion method.

5. The static driver chip for LED displays according to claim 1, characterized in that: The chip is packaged using a BGA method.

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