Display Substrate Dual Data Lines High Refresh Rate
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Solution Overview
Problem
High refresh frequencies in display apparatuses lead to insufficient charging rates and reduced threshold voltage compensation, affecting image quality and user experience due to shortened data writing and compensation times.
Innovation Solution
The implementation of a display substrate with a 7T1C pixel driving circuit structure and a dual-data-line driving manner, where every two adjacent sub-pixels in a column are connected to different data lines, allowing for extended data writing and compensation periods to ensure sufficient charging time and improve threshold voltage compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high refresh frequency is implemented, then image quality and visual experience are improved, but data writing time and compensation time are insufficient
Solution Approach 1:
The pixel array is divided into odd-column pixel groups and even-column pixel groups, with each group having independent data lines. This segmentation allows different columns to be driven at different times, effectively extending the data writing time for each group while maintaining high overall refresh frequency.
Solution Approach 2:
The display apparatus alternates between driving odd-column pixel groups and even-column pixel groups in periodic time slots. During the first time slot, odd columns receive data and compensation; during the second time slot, even columns receive data and compensation. This periodic action distributes the time requirements across multiple cycles, ensuring sufficient time for each operation.
2Speed
If high refresh frequency is implemented, then image quality is improved, but threshold voltage compensation is reduced
Solution Approach 1:
By segmenting the pixel array into independent odd and even column groups with separate data lines, the patent allocates dedicated compensation time slots for each group. This ensures that threshold voltage compensation can be completed reliably for all pixels without being compromised by the high refresh frequency requirements.
Solution Approach 2:
The patent performs threshold voltage compensation in advance during dedicated compensation time slots before the data writing phase. By completing compensation preliminarily for each pixel group before displaying the next frame, the system ensures accurate threshold voltage values are established, improving the reliability of subsequent display operations at high refresh frequencies.
3Duration of action of moving object
If dual data line structure is used, then charging time is sufficient, but device complexity increases
Solution Approach 1:
The odd-column data lines and even-column data lines serve multiple functions: they provide data signaling, threshold voltage compensation, and independent timing control for their respective pixel groups. This multi-functionality justifies the increased structure by maximizing the utility of each data line while achieving sufficient charging time.
Solution Approach 2:
The patent introduces a time dimension to the data line structure by alternating between odd and even column groups across different time slots. This temporal dimension allows the system to effectively manage the complexity of dual data lines by organizing their operation in a structured, predictable sequence that simplifies control logic.
Data Source
AI summary
A display substrate has sub-pixels. Each column of sub-pixels includes first and second sub-pixels alternately arranged. The display substrate includes a base, a second source-drain metal layer including first and second connection portions, and a first source-drain metal layer including first and second data lines alternately arranged. A pixel driving circuit of each first sub-pixel is connected to a second end of a first connection portion, and a first end there is connected to a corresponding first data line. A pixel driving circuit of each second sub-pixel is connected to a second end of a second connection portion, and a first end thereof is connected to a corresponding second data line. In a same column of sub-pixels, an extension direction of a first line connecting a second end of a first connection portion and a second end of a second connection portion is substantially parallel to a second direction.