Passive Matrix Display Driving Method for Capacitive Coupling
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Solution Overview
Problem
Conventional single-point driving methods for passive matrix display panels suffer from capacitive coupling effects, which affect the display quality of adjacent pixels and result in prolonged driving times due to sequential pixel activation.
Innovation Solution
A driving method for passive display panels that determines the display of color frames row by row or column by column based on pixel counts and thresholds, minimizing capacitive coupling by selectively activating entire rows or columns, thereby reducing the impact of coupling effects and shortening the time required to display a single frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-point driving method is used to drive pixels one by one, then each pixel can be precisely controlled, but the driving time becomes very long
Solution Approach 1:
The patent segments the pixel array into multiple groups (e.g., even rows and odd rows, or different color sub-pixel groups). Instead of driving pixels one by one in single-point mode, the patent drives entire groups of pixels simultaneously within each segment. This segmentation allows parallel driving of multiple pixels, significantly reducing the overall driving time while maintaining control precision through group-based addressing schemes.
2Measurement precision
If single-point driving method is used, then individual pixel control is achieved, but capacitive coupling effect affects adjacent pixels and degrades display quality
Solution Approach 1:
The patent segments the pixel array into spatially separated groups (such as alternating rows or color-subpixel groups). By driving these segmented groups in an interleaved manner rather than sequentially adjacent pixels, the patent increases the spatial and temporal separation between driven pixels. This reduces the capacitive coupling effect between adjacent pixels that share row or column electrodes, thereby improving display quality while maintaining individual pixel control capability.
Solution Approach 2:
The patent employs periodic driving patterns where pixels are driven in a repeating sequence across different groups (e.g., driving all even rows, then all odd rows, or driving different color sub-pixel groups in alternating cycles). This periodic action distributes the capacitive coupling effects uniformly across time and reduces the cumulative impact on any single pixel group, thereby mitigating the harmful coupling effects while maintaining precise pixel control.
3Device complexity
If pixels share column electrodes and row electrodes, then device complexity is reduced, but capacitive coupling between pixels increases
Solution Approach 1:
The patent segments the pixel array into multiple independent driving groups that can be addressed separately. By organizing pixels into groups (such as even/odd rows or color sub-pixel groups) and driving them in distinct time slots, the patent reduces the simultaneous capacitive interaction between pixels sharing the same electrodes. This segmentation approach maintains the simple shared electrode structure while minimizing its harmful capacitive coupling effects through temporal and spatial separation of driven pixel groups.
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 effectively reduces the impact of capacitive coupling on display quality and significantly shortens the driving time for displaying a frame by activating pixels in a manner that avoids cross-talk between rows and columns, enhancing the efficiency of the display process.
Implementation Method 1
charges stored in other pixels of the passive matrix display are affected due to the capacitive coupling effect
Data Source
AI summary
A driving method of a passive displayed panel and a display apparatus are provided. The passive display panel includes a plurality of pixels arranged into an array. The driving method includes following steps. Whether to display a first color frame or a second color frame on the passive display panel is determined according to a display frame. Whether to display a first color at each row or each column of the pixels of the passive display panel is determined according to the display frame. Whether to display a second color at each row or each column of the pixels of the passive display panel is determined according to the display frame. The first color or the second color is displayed column by column or row by row on the passive display panel at those portions of the display frame that do not display the first color or the second color.