Display Scan Line Zone Charging for Uniform Sub-pixel Timing
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Solution Overview
Problem
The existing Tri-Gate and Dual Gate driving methods for display devices result in uneven charging times of sub-pixels due to parasitic capacitance between scan lines, data lines, transistors, and sub-pixels, leading to signal loss and prolonged charging times near the end of the scan line.
Innovation Solution
The method involves dividing each row of sub-pixels into zones and using the zone positions as charging start points for scan lines, allowing for zone scanning by inputting scan voltage signals to different regions, thereby reducing signal loss and achieving even charging times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scan driving signal is input from starting end to finishing end of scan line, then all sub-pixels are charged sequentially, but parasitic capacitance causes signal loss and uneven charging time
Solution Approach 1:
The scan line is divided into multiple segments with different starting ends. Specifically, even-numbered scan lines charge sub-pixels from left to right while odd-numbered scan lines charge from right to left, creating segmented charging paths that eliminate the cumulative signal loss effect of single-direction scanning
Solution Approach 2:
The scanning direction is inverted for alternating scan lines. Instead of all scan lines charging from the same starting end, adjacent scan lines use opposite directions (one from left-to-right, next from right-to-left), which balances the parasitic capacitance effect and achieves uniform charging time across all sub-pixels
2Device complexity
If scan line charges all sub-pixels from one end, then charging is simplified, but parasitic capacitance between scan line and other components causes signal degradation
Solution Approach 1:
The pixel array is divided into multiple scanning regions with different charge-in directions. Even scan lines form one scanning region charging from left to right, while odd scan lines form another region charging from right to left, segmenting the parasitic capacitance effect across multiple regions
Solution Approach 2:
Different scan lines are assigned different scanning directions based on their local position in the pixel array. This local differentiation optimizes each scan line's charging path to compensate for position-dependent parasitic capacitance effects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures consistent and symmetric charging times for sub-pixels connected to the scan line, reducing the difference in charging times between sub-pixels at the two ends and improving overall charging efficiency.
Implementation Method 1
since there is a parasitic capacitance between the scan line and the data line, between the adjacent scan lines, between the scan line and the transistor, or between the scan line and the sub-pixels
Data Source
AI summary
A driving method and a driving device (100) for a display device (200). The display device (200) comprises a pixel array consisting of several rows of sub-pixels, and each row of sub-pixels is correspondingly connected to a scan line. The driving method comprises: partitioning each row of sub-pixels into different areas, and taking the areas of the each row of sub-pixels as the charging start point positions of the scan line corresponding to the each row of sub-pixels (S101); and inputting scanning voltage signals to the different areas of a row of sub-pixels corresponding to each scan line through the charging start point positions of the each scan line to perform partition scanning for the each row of sub-pixels (S102).