Scan Driver Segmentation for High-Resolution Display Charging
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Solution Overview
Problem
In display devices, the charging rate of data lines decreases as resolution increases, affecting the lighting inspection of pixels connected to the same data line, leading to potential color mixing and reduced reliability of lighting inspections.
Innovation Solution
The display device incorporates a scan driver with multiple stages that supply scan signals to different scan lines, using test transistors to apply lighting voltages to pixels connected to the same data line, ensuring efficient charging and preventing color mixing by selectively turning on and off pixels based on start signals and test gate signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of the display device is increased, then the display quality is improved, but the charging rate of the data line decreases
Solution Approach 1:
The scan driver is divided into multiple stages (first stage, second stage, third stage, etc.) that sequentially supply scan signals to different groups of scan lines. This segmentation allows the data line to be charged in discrete time intervals corresponding to each stage's operation, ensuring sufficient charging time even in high-resolution displays with many pixels connected to the same data line.
2Device complexity
If multiple pixels emitting different colors are connected to the same data line, then the device complexity is reduced, but color mixing occurs during lighting inspection
Solution Approach 1:
Before lighting inspection, the scan driver is configured to supply scan signals only to specific scan lines corresponding to the pixels to be inspected. Test transistors are activated to apply lighting voltages selectively to these pixels. This preliminary configuration ensures that only the intended pixels are activated during inspection, preventing color mixing from adjacent pixels connected to the same data line.
Solution Approach 2:
The lighting voltage application is localized to specific pixels through selective activation of test transistors and targeted scan signal supply. Each test transistor is associated with specific scan lines and controls lighting voltage application to particular pixels, ensuring that lighting inspection is performed locally on individual pixels or specific groups without interference from other pixels on the same data line.
3Ease of operation
If lighting voltage is applied to all pixels on a data line simultaneously, then the inspection process is simplified, but the charging time is insufficient
Solution Approach 1:
The scan driver operates in periodic cycles, with each cycle divided into multiple stages that sequentially supply scan signals to different groups of scan lines. During lighting inspection, this periodic operation allows the data line to be charged in stages rather than requiring simultaneous charging of all pixels. Each stage provides a discrete time interval for charging, ensuring sufficient total charging time while maintaining a systematic and manageable inspection process.
Data Source
AI summary
A display device includes: a plurality of first pixels connected to first scan lines and a first data line, a plurality of second pixels connected to second scan lines and the first data line, a plurality of third pixels connected to the first scan lines or the second scan lines and a second data line, and a scan driver including a plurality of stages which supplies scan signals to one of the first scan lines and the second scan lines.