Scan Driver Unequal Buffer Sizes for Display Luminance
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Solution Overview
Problem
Existing scan drivers for display panels face challenges in optimizing image display quality, particularly in ensuring uniform luminance across the panel, leading to issues like dark image portions at the end of the display.
Innovation Solution
The implementation of a scan driver with stages having unequal buffer sizes for transistors in each stage, along with specific pulse output configurations, such as outputting multiple scan writing pulses during a frame period, to adjust signal levels and prevent image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If equal buffer sizes are used for all stages, then device complexity is reduced, but image display quality deteriorates with dark portions at panel edges
Solution Approach 1:
The patent applies local quality by configuring different buffer sizes for different stages of the scan driver. Specifically, stages closer to the end of the display panel (where signal degradation causes dark portions) are assigned larger buffer sizes to maintain signal strength, while earlier stages use smaller buffer sizes. This localized differentiation resolves the contradiction by optimizing image quality precisely where needed without unnecessarily increasing complexity throughout the entire system.
Solution Approach 2:
The patent changes the buffer size parameter across different stages to optimize performance. By varying the buffer size parameter from stage to stage (increasing it for later stages), the system achieves uniform luminance across the display panel while managing overall complexity through systematic parameter adjustment rather than arbitrary complexity increase.
2Illumination intensity
If multiple scan writing pulses are output during a frame period, then luminance uniformity is improved, but time consumption increases
Solution Approach 1:
The patent implements periodic action by outputting multiple scan writing pulses (e.g., three pulses) within each frame period instead of a single continuous scan. These pulses are distributed periodically throughout the frame period, allowing the display panel to receive refreshed scan signals at multiple intervals. This periodic reinforcement of scan signals ensures uniform luminance across the panel, particularly at the edges, while managing time consumption by spacing the pulses appropriately within the available frame period.
Data Source
AI summary
A scan driver may include a first stage, a second stage, and a third stage. The first stage may include a first output transistor. The first output transistor may have a first buffer value. The second stage may be electrically connected to the first output transistor and may include a second output transistor. The second output transistor may have a second buffer value. The third stage may be electrically connected to the second output transistor and may include a third output transistor. The third output transistor may have a third buffer value. At least one of the second buffer value and the third buffer value may be unequal to the first buffer value.