LED Display Current Control via Variable Resistance Block
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Solution Overview
Problem
Conventional LED electronic display board systems fail to fully utilize 16-bit image data, resulting in reduced display quality due to limitations in PWM control and complex current control mechanisms, especially at low brightness levels and across multiple LED drivers.
Innovation Solution
The system incorporates a variable resistance block connected to sub-controllers, allowing for constant current control in addition to PWM control, enabling 16-bit or higher display quality by adjusting the resistance value via a main controller, simplifying control and improving image display across multiple LED drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If PWM control is used to convert 8-bit image data into 16-bit image data, then brightness control is improved, but display quality is reduced at low brightness levels
Solution Approach 1:
The patent changes the control parameter from voltage-based PWM control to current-based control using a variable resistance block. This allows precise control of LED current to fully utilize 16-bit image data, maintaining display quality across all brightness levels by directly controlling the electrical parameter (current) rather than using pulse width modulation.
2Measurement precision
If current control is implemented at individual driver IC level with reference resistance, then light calibration is improved, but control complexity increases
Solution Approach 1:
The patent merges the current control function into a single variable resistance block that is shared across multiple LED drivers. Instead of implementing separate reference resistance and control circuits in each driver IC, the system uses one centralized variable resistance block controlled by a single control signal, dramatically reducing device complexity while maintaining precise light calibration capability.
Solution Approach 2:
The variable resistance block serves as a universal control element for multiple LED drivers simultaneously. A single resistance value adjustment controls the current for all connected LED modules, making the control system universal and eliminating the need for individual driver-specific calibration, thereby simplifying the overall system architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances display quality to 16-bit or more by effectively utilizing 16-bit data and simplifies control, ensuring improved image rendering and easier management of multiple LED drivers.
Implementation Method 1
a variable resistance block 21 connected in parallel to the first to Nth LED modules 1-1, 1-2, . . . , 1-N
Data Source
AI summary
The LED electronic display board system according to the present invention comprises first to Mth sub-controllers 2-1, 2-2, . . . , 2-M (here, N and M are a natural number), each of which comprises first to Nth LED modules 1-1, 1-2, . . . , 1-N, to control the first to Nth LED modules 1-1, 1-2, . . . , 1-N; and a main controller 3 which is connected to the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M to control the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M, wherein the first to Mth sub-controllers 2-1, 2-2, . . . , 2-M each further comprise a constant current roller 20 and a variable resistance block 21, and the constant current controller 20 adjusts a resistance value of the variable resistance block 21 according to a signal of the main controller 3 to adjust the size of current.