Display Device Initialization Voltage Compensation for Threshold Variation
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Solution Overview
Problem
Active matrix organic light emitting display devices face issues with non-uniform threshold voltage distribution among driving transistors, leading to variations in emission degree and luminosity across pixels, resulting in display quality issues such as gray spots and low accuracy in gray scale representation.
Innovation Solution
A display device and method that include a scan driver, data driver, initialization voltage controller, and initialization voltage driver to measure threshold voltage variations and apply different initialization voltages to regions of the display panel, compensating for threshold voltage deviations by displaying a sample image and analyzing luminance to determine and apply specific initialization voltages to each region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single initialization voltage is applied to all pixels, then the device structure remains simple, but threshold voltage variations cause non-uniform emission and display quality degradation
Solution Approach 1:
The patent divides the display panel into multiple regions and applies different initialization voltages to each region based on measured threshold voltage characteristics. This local differentiation approach compensates for spatial variations in transistor threshold voltage, improving display uniformity without requiring individual pixel-level control
Solution Approach 2:
The display panel is segmented into multiple regions for threshold voltage measurement and compensation. By measuring and compensating threshold voltage in regional units rather than treating the entire panel uniformly, the system achieves better display quality while maintaining manageable complexity in the control structure
2Manufacturing precision
If threshold voltage compensation is performed for all pixels individually, then display quality improves, but the compensation time becomes too long for high-speed driving modes
Solution Approach 1:
The patent performs threshold voltage compensation on a representative sample of pixels from each region rather than every single pixel. This partial measurement approach provides sufficient compensation accuracy for the entire region while significantly reducing the time required compared to measuring all pixels individually
Solution Approach 2:
Threshold voltage measurement and compensation is performed in advance during an initialization phase before normal high-speed display operation begins. This preliminary compensation establishes the appropriate initialization voltages for each region, enabling subsequent fast driving modes without real-time compensation delays
Data Source
AI summary
A display device is disclosed. The device includes a display panel including a plurality of pixels, each connected to a corresponding scan line, a corresponding data line, and a corresponding initialization control line and configured to display an image according to a data signal. The device includes an initialization voltage controller to measure a threshold voltage deviation for driving transistors of the pixels, and to set different initialization voltages for the pixels of each of a plurality of regions.