Display Degradation Compensation Circuit Using Panel-Specific Weights
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Solution Overview
Problem
Display devices experience degradation of light emitting elements and driving transistors over time, leading to luminance variations and threshold voltage shifts, which affect pixel performance.
Innovation Solution
A display device with a degradation compensator circuit that generates compensation data using panel weights based on fabrication and module data to account for estimated degradation dispersion, adjusting input data to compensate for transistor and light emitting element degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If degradation compensation is performed using only accumulated data without panel weights, then the compensation process is simpler, but the compensation accuracy is insufficient due to ignoring degradation dispersion
Solution Approach 1:
The patent applies preliminary action by pre-calculating panel weights based on fabrication data and module data before actual operation. These weights, which represent estimated degradation dispersion information, are stored in advance and then applied to accumulated data during compensation operations, eliminating the need for real-time complex calculations while maintaining high accuracy
Solution Approach 2:
The patent introduces a new dimension of compensation by adding panel weights that account for degradation dispersion across different panels and regions. This transforms the compensation from a single accumulated data dimension to a multi-dimensional approach that incorporates fabrication variations, module characteristics, and spatial distribution of degradation
2Reliability
If current sensing is performed frequently to track degradation, then degradation tracking accuracy is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent uses preliminary action by pre-establishing panel weights from fabrication and module data that predict degradation patterns. This allows the system to compensate for degradation using only accumulated operational data without requiring frequent current sensing operations, significantly reducing power consumption while maintaining tracking accuracy
Solution Approach 2:
The system applies self-service by using its own accumulated operational data combined with pre-calculated panel weights to automatically compensate for degradation. This eliminates the need for external current sensing measurements, allowing the display device to self-diagnose and self-correct degradation effects with minimal additional power consumption
3Ease of operation
If uniform compensation is applied to all pixels, then the compensation process is simpler, but compensation accuracy varies across different panels due to fabrication variations
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple regions or blocks and calculating separate panel weights for each region based on local fabrication data and module characteristics. This allows compensation to be tailored to specific areas of the panel that have different degradation characteristics, improving overall compensation accuracy while maintaining operational simplicity through automated region-based processing
4Device complexity
If degradation compensation does not account for fabrication variations, then the compensation system is simpler, but compensation effectiveness decreases across different production batches
Solution Approach 1:
The patent applies preliminary action by incorporating fabrication data into the pre-calculation of panel weights during or after the manufacturing process. This ensures that each panel or batch receives compensation parameters tailored to its specific fabrication characteristics, making the compensation system highly effective across different production batches without increasing operational complexity
Solution Approach 2:
The patent applies parameter changes by using fabrication data (such as deposition conditions, cleaning parameters, and process variables) to adjust the panel weights that are applied during compensation. This allows the compensation system to adapt to variations in fabrication parameters across different batches, maintaining consistent effectiveness despite manufacturing variations
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a degradation compensator circuit configured to generate compensation data that compensates for degradation of the pixels using a panel weight including characteristics of the display panel; and a timing controller configured to reflect the compensation data in input data and generate output data. The panel weight is generated based on fabrication data including a process variable of the display panel and module data including at least one characteristic of the pixels.