Display Panel Compensation Using Line Pixel Current Sources
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Solution Overview
Problem
Existing display devices face inaccuracies in compensating for characteristic deviations between pixels due to differences in current paths and reference current distribution, leading to errors in pixel characteristic correction.
Innovation Solution
A display device method where at least one line pixel acts as a current source generating a pixel current with a same value, using a combination of voltage and current sensing methods to correct deviations between current sensing paths and across all pixels, with a compensation circuit controlling reference voltages and data to accurately correct pixel characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external reference current source is used to correct characteristic deviation between source drivers, then correction can be performed, but error occurs in sensing value due to difference between current paths
Solution Approach 1:
The patent introduces line pixels as intermediary current sources that generate reference currents locally within the display panel. These line pixels serve as mediators between the pixel circuit characteristics and the sensing circuit, eliminating the need for external reference current sources and independent current paths. By using the line pixel's own pixel current as the reference, the sensing is performed through the same current path, thereby eliminating path difference errors.
Solution Approach 2:
The line pixels serve themselves as both display elements and reference current sources. Each line pixel generates its own pixel current based on its actual circuit characteristics (including threshold voltage and mobility variations), and this self-generated current is used as the reference for sensing adjacent pixels. This self-service approach ensures the reference current inherently matches the local circuit conditions, eliminating errors from external reference distribution.
2Stability of the object's composition
If voltage sensing method is used to correct pixel characteristics, then correction process is stable, but correction speed is slow
Solution Approach 1:
The patent merges the voltage sensing method and current sensing method into a unified compensation system. The voltage sensing provides stable reference for threshold voltage correction, while the current sensing (using line pixel currents as references) provides fast response for mobility and current characteristic correction. By combining both sensing approaches, the system achieves both stability from voltage sensing and speed from current sensing, resolving the trade-off between these two parameters.
3Measurement precision
If multiple sensing methods are combined to improve correction accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The line pixels serve multiple functions simultaneously: they act as display pixels for image output, as current sources for reference current generation, and as sensing elements for pixel characteristic measurement. This multi-functionality eliminates the need for separate dedicated reference current sources and simplifies the sensing circuit architecture. The same pixel circuit structure is utilized for both display and compensation purposes, reducing overall device complexity while maintaining high measurement precision through combined voltage and current sensing.
Data Source
AI summary
Disclosed are a display device and a panel compensation method of the display device. The panel compensation method of the display device includes a step of allowing at least one line pixel of a display panel to be a current source that generates a pixel current with the same value, and a step of correcting a deviation between all current sensing paths of a source driver by using the pixel current with the same value and correcting a characteristic deviation between all pixels after correcting the deviation between the current sensing paths.