LED Array Compensation Circuit for High-Contrast Display Interference
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Solution Overview
Problem
The high-contrast interference phenomenon in LED display screens due to parasitic capacitors between wires in common anode and common cathode circuits, causing interference between high-brightness and low-brightness images when they overlap in a row.
Innovation Solution
Incorporating compensation units with adjustable capacitors and reverse units connected in series between adjacent LEDs, which have opposite conduction directions, to neutralize the interference caused by parasitic capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parasitic capacitors are present between wires in common anode/cathode circuits, then circuit connectivity is maintained, but high-contrast interference occurs between high-brightness and low-brightness images
Solution Approach 1:
The patent converts the harmful parasitic capacitor effect into a beneficial compensation mechanism by introducing adjustable capacitors with equal capacitance values. These capacitors generate compensation voltages that precisely counteract the interference caused by parasitic capacitors, transforming the harmful electromagnetic coupling into a controlled compensation function that eliminates high-contrast interference.
Solution Approach 2:
The patent employs adjustable capacitors with variable capacitance values that can be tuned to match the parasitic capacitor effects. By changing the capacitance parameter of the compensation units, the system adapts to different parasitic effects and maintains optimal performance across varying display conditions, thereby eliminating interference while preserving circuit connectivity.
2Object-affected harmful factors
If compensation units with adjustable capacitors are added between adjacent LEDs, then high-contrast interference is eliminated, but device complexity increases
Solution Approach 1:
The compensation units are designed to automatically compensate for parasitic capacitor effects without requiring external control or adjustment during operation. The adjustable capacitors are pre-tuned to match the parasitic effects, allowing the circuit to self-correct interference automatically, thereby reducing the need for complex control mechanisms while maintaining improved performance.
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
Eliminates interference between LEDs in the same row, improving the display quality by compensating for voltage variations and maintaining intended brightness levels.
Implementation Method 1
a first adjustable capacitor and a first reverse unit that are connected in series, and the second compensation unit includes a second adjustable capacitor and a second reverse unit that are connected in series. A capacitance value of a parasitic capacitor between the two adjacent LEDs is a first capacitance value, and capacitance values of the first adjustable capacitor and the second adjustable capacitor are set to the first capacitance value.
Implementation Method 2
The first reverse unit and the second reverse unit have opposite conduction directions. A first compensation voltage is generated on the second LED under an action of the first conductive channel, and the first compensation voltage and the first voltage are reversely equal.
Data Source
AI summary
Provided are an LED array display unit, a display screen, and a display system. The LED array display unit includes a plurality of LEDs, and in each row of the LED array display unit, two compensation units connected in parallel are provided between any two adjacent LEDs. Each compensation unit includes an adjustable capacitor and a reverse unit connected in series. A capacitance value of a parasitic capacitor between any two adjacent LEDs is a first capacitance value, and capacitance values of all adjustable capacitors are set to the first capacitance value. Two reverse units between any two adjacent LEDs have opposite conduction directions.