LED Display Data Compression for Larger Cascaded Screen Area
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Solution Overview
Problem
The existing LED display systems face limitations in display screen area due to the large bit width of display data, which reduces the number of cascaded LED module groups that can be driven under a given communication bandwidth.
Innovation Solution
Implementing gamma correction to obtain gray scale data with a wider bit width, followed by data compression to reduce the bit width further, and then decompressing it back to the original width at the LED modules, allowing more LED modules to be driven under the same bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bit width of gray scale data is increased to improve display precision, then the display precision is improved, but the communication bandwidth requirement increases and the display screen area that can be loaded is reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bit width of compressed data based on the gamma correction value. When gamma correction is small, fewer bits are needed for compressed data, allowing more LED modules to be driven within the same communication bandwidth. This resolves the contradiction by adapting the data representation parameter to the actual display requirements rather than using a fixed high bit width always.
Solution Approach 2:
The system dynamically determines the bit width of compressed data based on the gamma correction value and communication bandwidth constraints. The control terminal calculates the appropriate bit width in real-time, allowing the system to adaptively optimize between display precision and the number of drivable LED modules. This dynamic adjustment resolves the contradiction by making the system flexible rather than static.
2Area of stationary object
If the bit width of display data is reduced to increase the display screen area, then the display screen area is increased, but the display precision deteriorates
Solution Approach 1:
The patent introduces compressed data as an intermediary between the original display data and the LED module drive signals. The control terminal compresses the gray scale data to a lower bit width that can drive more LED modules, while the LED modules decompress the data to restore the original precision for display. This intermediary compression-decompression process resolves the contradiction by separating the transmission optimization from the display quality requirement.
Solution Approach 2:
The system segments the data processing into distinct stages: gamma correction, compression for transmission, and decompression for display driving. By segmenting the bit width adjustment to occur only during transmission rather than throughout the entire process, the system can reduce bit width to increase display area while maintaining precision where needed for actual display output.
3Area of stationary object
If more LED modules are driven to increase display screen area, then the display screen area is increased, but the communication bandwidth requirement increases
Solution Approach 1:
The patent changes the data representation parameter (bit width) based on the number of LED modules to be driven. When more LED modules need to be driven, the system uses smaller bit widths for compressed data, reducing the total communication bandwidth requirement. This parameter adaptation allows the system to drive more modules without proportionally increasing bandwidth consumption.
Solution Approach 2:
The system applies partial compression by using variable bit widths rather than consistently applying maximum compression. The control terminal calculates the minimum necessary bit width to drive the required number of LED modules, avoiding unnecessary bandwidth consumption while still achieving the goal of driving more modules. This partial action approach optimizes the balance between display area and bandwidth usage.
Data Source
AI summary
Disclosed is a display control method of an LED display system comprising a control terminal and a plurality of cascaded LED module groups each of which comprises a plurality of stages of LED modules connected in cascade, wherein the display control method comprises: performing a gamma correction on display data with an initial bit width to obtain gray scale data with a first bit width; compressing the gray scale data to obtain compressed data with a second bit width; sending the compressed data to a corresponding cascaded LED module group. Further disclosed is an LED display system, which can reduce the bit width of the display data transmitted between the control terminal and the plurality of cascaded LED module groups, so as to drive more LED modules under the same bandwidth, and increase the display screen area that can be loaded by communication.