Display Panel Region Compensation for Luminance Uniformity
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Solution Overview
Problem
Large-sized display devices with high-speed driving methods face challenges in sufficiently compensating for threshold voltage deviations across all pixels, leading to visible stains and luminance degradation due to differing transistor threshold voltages.
Innovation Solution
A display device and method that divide the display panel into regions based on threshold voltage differences, compensating for image data by setting data compensation values for each region using a target initialization power supply voltage determined through luminance analysis, allowing all pixels to emit light at a target luminance, thereby preventing luminance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threshold voltage compensation is applied to all pixels in a large-sized display device with high-speed driving method, then luminance uniformity is improved, but driving time and complexity increase making sufficient compensation difficult
Solution Approach 1:
The display panel is divided into multiple regions based on threshold voltage characteristics. Instead of uniformly compensating all pixels, the controller segments the panel into regions with similar threshold voltage deviations and applies region-specific compensation values. This segmentation approach reduces the overall compensation time while maintaining luminance uniformity across different regions of the large-sized display device.
Solution Approach 2:
Different compensation strategies are applied to different regions of the display panel based on their specific threshold voltage characteristics. The controller determines region-specific compensation values that match the local pixel characteristics, rather than applying a uniform compensation approach. This local quality approach enables effective threshold voltage compensation within each region while reducing the total compensation time for the entire large-sized display device.
2Measurement precision
If region-based threshold voltage compensation is implemented, then compensation precision is improved, but device complexity increases
Solution Approach 1:
The controller pre-determines compensation values for each region based on threshold voltage characteristics before actual image display. By performing this preliminary compensation setup, the controller establishes region-specific compensation parameters that can be applied during normal operation without requiring complex real-time calculations. This preliminary action reduces the computational burden during image processing while maintaining high compensation precision.
Solution Approach 2:
The system adjusts compensation parameters based on region-specific threshold voltage characteristics. By changing the compensation values according to the measured threshold voltage deviations in each region, the controller achieves precise compensation. This parameter change approach allows the system to adapt to different regional characteristics without requiring complex hardware modifications, thereby improving compensation precision while controlling device complexity.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a controller for dividing the display panel into a plurality of regions, compensating for image data provided from the outside based on a data compensation value set with respect to each of the plurality of regions, and providing the compensated image data to the display panel, and an initialization power supply for supplying an initialization power supply voltage to the display panel, wherein the data compensation value is set with respect to each of the plurality of regions of the display panel based on a difference between a target initialization power supply voltage and the initialization power supply voltage, wherein the target initialization power supply voltage is a voltage that is configured to allow any region to emit light at a target luminance with respect to image data for sensing.