Display Panel Deterioration Compensation via Regional Sensing
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Solution Overview
Problem
Display panels in display apparatuses experience deterioration over time, leading to inaccuracies in non-emitting sensing operations and reduced accuracy in deterioration compensation.
Innovation Solution
A display apparatus that compensates for panel deterioration by reflecting changes in sensing current corresponding to black color during non-emitting sensing, using a driving controller with a deterioration compensator that generates data signals based on a deterioration ratio between low and high deterioration regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-emitting sensing operation is performed without considering sensing current changes, then sensing operation can be completed, but deterioration compensation accuracy is reduced
Solution Approach 1:
The patent segments the display panel into multiple regions (first region with low deterioration and second region with high deterioration) and performs sensing operations separately on each region. This allows the system to capture different deterioration characteristics in different areas without requiring a completely complex unified sensing approach, thereby improving compensation accuracy while managing complexity through regional differentiation.
Solution Approach 2:
The patent performs preliminary sensing operations to measure sensing currents in both the first and second regions before actual deterioration compensation is needed. By pre-measuring the sensing current characteristics and storing this information, the system prepares the data needed for accurate deterioration calculation, eliminating the need for complex real-time sensing during compensation operations.
2Reliability
If sensing current changes corresponding to black color are ignored, then non-emitting sensing operation is simplified, but deterioration compensation error increases
Solution Approach 1:
The patent incorporates feedback by measuring the sensing current in the second region (high deterioration region) and using this information to calculate the deterioration ratio. The sensing current measurement serves as feedback about the actual deterioration state, which then feeds back into the compensation calculation, ensuring accuracy while maintaining a relatively simple sensing operation structure.
Solution Approach 2:
The patent changes the parameter being measured from just luminance (emitting state) to include sensing current (non-emitting state). By introducing the sensing current parameter, the system captures deterioration effects that were previously ignored, improving reliability without fundamentally changing the simplicity of the sensing operation itself.
3Measurement precision
If only one region is used for sensing, then sensing operation is simplified, but deterioration compensation accuracy is reduced
Solution Approach 1:
The patent divides the display panel into multiple sensing regions (first region with low deterioration and second region with high deterioration) and performs separate sensing operations on each. This segmentation allows the system to capture spatial variations in deterioration while keeping each individual sensing operation relatively simple, balancing measurement precision with operational simplicity.
Solution Approach 2:
The patent applies local quality by recognizing that different regions of the display panel have different deterioration characteristics. The first region has low deterioration while the second region has high deterioration, so the sensing operation is tailored to capture these local differences. This allows accurate deterioration measurement without requiring a completely complex unified sensing system.
Data Source
AI summary
A display apparatus includes a display panel, a driving controller and a data driver. The display panel includes a low deterioration region and a high deterioration region. The driving controller generates a data signal based on input image data. The data driver converts the data signal to a data voltage and outputs the data voltage to the display panel. The driving controller includes a deterioration compensator which generates the data signal based on a deterioration ratio. The deterioration ratios may be a ratio between a sensing current of the low deterioration region and a sensing current of the high deterioration region.