Signal Line Spacing for Active Matrix Display Devices
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Solution Overview
Problem
Active matrix display devices using data division driving techniques often suffer from signal variations due to capacitive coupling, leading to stripe patterns in the displayed image, particularly at the boundaries between signal line groups.
Innovation Solution
The semiconductor device employs a configuration where switches are turned on and off in specific periods to control signal lines, with longer distances between signal lines in different states to minimize capacitive coupling effects, thereby reducing signal variations and suppressing stripe patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data division driving is implemented to reduce operating frequency, then the operating frequency of the driver circuit is reduced, but the number of source signal lines increases leading to signal variations and stripe patterns
Solution Approach 1:
The patent applies local quality by making the distance between signal lines non-uniform: specifically, the distance between an (n+1)-th signal line and an n-th signal line is made longer than the distance between adjacent signal lines within the same group. This localized adjustment of spacing compensates for capacitive coupling effects at group boundaries, ensuring signal uniformity across all signal lines while maintaining the data division driving structure.
2Productivity
If switches are arranged in groups for data division driving, then the operating frequency is reduced, but capacitive coupling between adjacent signal lines causes signal variations at group boundaries
Solution Approach 1:
The patent changes the physical parameter of signal line spacing to mitigate capacitive coupling. By increasing the distance between signal lines at group boundaries (specifically between (n+1)-th and n-th signal lines) compared to intra-group spacing, the capacitive coupling effect is reduced, thereby minimizing signal variations while maintaining efficient data division driving operation.
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 signal variations and prevents the formation of stripe patterns in the displayed image, enhancing the image quality of active matrix display devices.
Implementation Method 1
signal variations due to capacitive coupling
Implementation Method 2
wiring resistance and parasitic capacitance
Data Source
AI summary
To suppress variation of a signal in a semiconductor device. By suppressing the variation, formation of a stripe pattern in displaying an image on a semiconductor device can be suppressed, for example. A distance between two adjacent signal lines which go into a floating state in different periods (G1) is longer than a distance between two adjacent signal lines which go into a floating state in the same period (G0, G2). Consequently, variation in potential of a signal line due to capacitive coupling can be suppressed. For example, in the case where the signal line is a source signal line in an active matrix display device, formation of a stripe pattern in a displayed image can be suppressed.