Display Panel Drive Compensation for Signal Attenuation
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Solution Overview
Problem
Organic light-emitting display panels experience uneven display due to impedance and capacitive reactance variations in signal lines, leading to brightness differences across the panel.
Innovation Solution
A drive compensation method and system that determines the impedance and capacitive reactance variation curves of signal lines and charge rate curves of pixel units, calculates compensation coefficients, and applies these coefficients to the drive signals to equalize brightness across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines are used to provide drive signals to pixel driving circuits, then the display panel can be driven, but impedance and capacitive reactance cause signal attenuation leading to display unevenness
Solution Approach 1:
The patent applies preliminary action by pre-calculating compensation coefficients based on the impedance and capacitive reactance characteristics of signal lines before actual display operation. These coefficients are stored in advance and applied to compensate for signal attenuation, ensuring uniform display performance across all pixel units despite the inherent signal loss in long signal lines.
Solution Approach 2:
The patent implements parameter changes by adjusting the drive signal parameters (voltage or current) based on the position of pixel units relative to the signal line characteristics. By changing the drive signal parameters according to pre-calculated compensation coefficients, the system compensates for signal attenuation and maintains uniform display across the panel.
2Adaptability or versatility
If signal lines extend laterally or longitudinally to cover the display panel, then all pixel units can be connected, but impedance and capacitive reactance increase causing brightness differences
Solution Approach 1:
The patent applies local quality by providing different compensation coefficients to different pixel units based on their specific positions and the local signal line characteristics. Each pixel unit receives a customized drive signal adjustment tailored to its location, compensating for the varying impedance and capacitive reactance effects at different positions across the display panel.
Solution Approach 2:
The patent uses preliminary action by pre-calculating and storing compensation coefficients for each pixel unit based on the signal line's impedance and capacitive reactance characteristics before actual display operation. This advance preparation enables the system to compensate for brightness differences without requiring real-time measurement or adjustment during operation.
3Productivity
If drive signals are transmitted through signal lines with impedance, then pixel driving circuits receive drive signals, but signal attenuation causes differences between pixel driving circuits
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the drive signal parameters (voltage or current magnitude) based on pre-calculated compensation coefficients that account for signal line characteristics. This parameter adjustment ensures that all pixel driving circuits receive effectively equal drive signals despite the attenuating effect of impedance in the signal lines.
Solution Approach 2:
The patent applies feedback by using measured or calculated signal line characteristics (impedance and capacitive reactance) to determine compensation coefficients that are then applied to correct the drive signals. This closed-loop approach ensures that the actual drive signal received by each pixel unit compensates for the signal line attenuation, maintaining consistent pixel driving across the panel.
Data Source
AI summary
Provided are a drive compensation method and system of a display panel and a display device. The drive compensation method includes: determining at least one of the impedance and capacitive reactance variation curve of a first signal line in a column direction and determining the charge rate variation curve of first pixel units in a row direction; determining the compensation coefficients for a respective pixel unit in the column direction and/or the row direction according to the impedance and capacitive reactance variation curve of the first signal line in the column direction and/or the charge rate variation curve of first pixel units in the row direction; and compensating the compensation coefficients for the respective pixel unit in the column direction and/or the row direction to the drive signal of the respective pixel unit to drive the respective pixel unit.