Source Driver IC Difference Sensing Line for OLED Brightness Uniformity
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Solution Overview
Problem
In organic light emitting display devices, differences in sub-pixel characteristics due to varying degradation of driving transistors and OLEDs lead to brightness inconsistencies, causing image quality deterioration, and existing sensing techniques struggle with accurate data acquisition due to sensing component variations.
Innovation Solution
The implementation of a source driver integrated circuit with multiple sensing lines and a difference sensing line to connect sensing components, allowing for accurate analog-digital conversion and correction of sensing differences between sub-pixels, thereby improving image quality by compensating for characteristic variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensing components are used to sense sub-pixel characteristics, then sensing coverage is improved, but sensing differences between components cause measurement inaccuracies
Solution Approach 1:
A difference sensing line is introduced as an intermediary component to detect and quantify the sensing differences between multiple sensing components. This mediator enables the system to identify and compensate for variations in sensing characteristics, thereby maintaining measurement accuracy across all sensing components.
Solution Approach 2:
The system implements a feedback mechanism where the difference sensing line continuously monitors sensing component variations and provides correction information. This feedback loop allows the controller to adjust for sensing differences in real-time, ensuring consistent and accurate sub-pixel characteristic measurements across all components.
2Illumination intensity
If sub-pixel characteristic compensation is performed, then image quality is improved, but inaccurate sensing data leads to incorrect compensation and image variations
Solution Approach 1:
The difference sensing line acts as a mediator to detect sensing variations between components. By quantifying these differences, the system can apply precise compensation corrections to the sensing data before using it for sub-pixel characteristic adjustment, ensuring accurate brightness uniformity without introducing image variations.
Solution Approach 2:
The system dynamically adjusts sensing parameters based on the differences detected by the difference sensing line. By changing the sensing parameters or correction factors according to the detected variations, the system achieves accurate compensation for sub-pixel characteristics while maintaining image quality consistency across different sensing components.
3Device complexity
If sensing differences between components are not corrected, then device complexity is reduced, but image quality deteriorates due to brightness differences and block dim phenomenon
Solution Approach 1:
The difference sensing line serves as a minimal-added intermediary that detects sensing variations without significantly increasing device complexity. This single additional component enables the system to identify and compensate for sensing differences, preventing brightness inconsistencies and block dim phenomena while maintaining a relatively simple overall structure.
Solution Approach 2:
The difference sensing line is designed to work universally with multiple sensing components, providing a single solution that addresses sensing variations across the entire display panel. This multi-functional approach allows one additional component to compensate for differences across all sensing components, avoiding the need for complex individual corrections for each component.
Data Source
AI summary
There are provided a source driver integrated circuit, a controller, an organic light emitting display panel, an organic light emitting display device, and a method for driving the organic light emitting display device. Thus, it is possible to provide a structure in which different sensing components configured to sense sub-pixel characteristics can sense characteristics of the same sub-pixel together, and the structure enables more accurate recognition of a sensing difference between the sensing components on the basis of sensing values obtained from the respective sensing components and the sensing difference to be corrected using the recognized sensing difference. Thus, an image quality can be improved.