Dynamic Voltage Drop Compensation for Display Uniformity
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Solution Overview
Problem
Display devices face challenges in achieving uniformity, particularly when displaying images with high load, due to voltage drops (IR Drops) in the power source wirings, which vary with display panel load and image characteristics.
Innovation Solution
A display compensation method that involves obtaining display data, performing image identification to obtain a display feature message, calculating a display panel load coefficient, determining a voltage drop compensation coefficient, and applying this coefficient to the display data to achieve compensated display data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrical detection compensation or demura optical compensation is used, then display uniformity can be improved under normal conditions, but display uniformity deteriorates when displaying high load images due to voltage drops in power source wirings
Solution Approach 1:
The patent implements dynamic compensation by calculating different compensation coefficients based on the actual display content and panel load. The system dynamically adjusts the compensation amount according to the image being displayed, transitioning from static conventional compensation to adaptive dynamic compensation that responds to real-time display conditions.
Solution Approach 2:
The patent changes the compensation parameter (compensation coefficient) based on display load conditions. By calculating the display panel load coefficient from grayscale data and adjusting the compensation coefficient accordingly, the system adapts to different display scenarios, including high load conditions where conventional fixed compensation fails.
2Device complexity
If fixed compensation coefficients are used, then the compensation process is simple, but compensation accuracy deteriorates when display panel load varies with different image content
Solution Approach 1:
The patent dynamically changes the compensation coefficient based on the calculated display panel load coefficient. Instead of using a fixed compensation value, the system adjusts the coefficient according to the actual load conditions derived from the display content, thereby improving compensation accuracy without requiring overly complex fixed-parameter approaches.
Solution Approach 2:
The patent incorporates feedback mechanisms by analyzing the display data to determine the display panel load coefficient, then using this information to adjust the compensation coefficient. This closed-loop approach ensures that compensation accuracy is maintained across varying display conditions while keeping the process manageable through systematic feedback-based adjustment.
3Productivity
If no compensation is applied, then the display process is fast and simple, but display uniformity deteriorates due to voltage drops under high load conditions
Solution Approach 1:
The patent applies preliminary compensation by calculating the compensation coefficient before the actual display output. The system pre-processes the display data to determine the load coefficient and applies the appropriate compensation in advance, ensuring uniformity is maintained without requiring post-processing or slowing down the display pipeline.
Solution Approach 2:
The patent efficiently changes the compensation parameter based on load conditions without adding significant processing overhead. By using the grayscale data already present in the display pipeline to calculate the load coefficient, the system achieves adaptive compensation with minimal additional complexity, maintaining high display processing speed while improving uniformity.
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
The method effectively compensates for display uniformity issues by setting differentiated dynamic voltage drop compensation coefficients based on image content, leading to improved uniformity and quality of displayed images.
Implementation Method 1
an issue of uneven display occurs due to a voltage drop (IR Drop) resulting from an obvious impedance existing on OVDD and OVSS power source wirings
Data Source
AI summary
The present application relates to a display compensation method, including: performing an image identification process to display data to be compensated to obtain a display feature message; processing the display data to be compensated to obtain a display panel load coefficient; processing the display panel load coefficient and the display feature message to obtain a voltage drop compensation coefficient; and performing a compensation process to the display data to be compensated by the voltage drop compensation coefficient to obtain compensated display data to achieve compensation of display uniformity.