Capacitive Touch Screen Panel Inactive Region Reduction
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Solution Overview
Problem
The increase in size of touch screen panels leads to a larger inactive region, which is not proportional to the size of the light blocking member, resulting in inefficiencies and potential deterioration of sensing capacity.
Innovation Solution
The touch screen panel design includes an active region with first and second active regions, sense patterns, connection patterns, and driving patterns, where the driving patterns are strategically placed between sense pads and connected to sense patterns in the second active region, reducing the number of sense wires and minimizing the inactive region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the size of touch screen panel is increased, then the display area is improved, but the inactive region size is increased
Solution Approach 1:
The touch screen panel is divided into an active region and an inactive region. The sense patterns are strategically arranged within the active region, while the inactive region is minimized by optimizing the layout and reducing the number of sense wires required, thus segmenting the functional areas to improve overall efficiency
Solution Approach 2:
Sense patterns are arranged in a matrix structure with rows and columns, utilizing two-dimensional spatial arrangement. This allows for efficient routing of sense wires along the edges, reducing the inactive region area while maintaining full sensing capability across the increased display area
2Reliability
If the number of sense wires is increased, then the sensing capacity is improved, but the inactive region size is increased
Solution Approach 1:
Multiple sense wires are merged into fewer wires by arranging sense patterns in a matrix and routing wires along the edges. The sense patterns share common wire paths, reducing the total number of wires needed while maintaining sensing capacity across all regions
Solution Approach 2:
The sense wires serve multiple functions: they provide sensing capability for multiple sense patterns simultaneously and act as both signal transmission and capacitance sensing pathways. This multi-functionality reduces the number of dedicated wires needed, minimizing the inactive region
3Ease of manufacture
If the inactive region size is increased, then the sense wire routing is simplified, but the light blocking member region becomes insufficient
Solution Approach 1:
The sense wires are routed along the peripheral edges of the active region, concentrating the wire routing in specific local areas rather than distributing wires uniformly across the entire panel. This localized routing simplifies manufacturing while minimizing the overall inactive region area
Solution Approach 2:
The sense wire routing follows the boundary of the active region, dynamically adapting to the panel size and shape. This flexible routing approach simplifies manufacturing processes while ensuring that the inactive region does not excessively encroach on the light blocking member area
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 design reduces the size of the inactive region, minimizes dead spaces, and maintains or improves the sensing capacity by reducing resistance and allowing for a single process to form sense and driving patterns, thus addressing the inefficiencies caused by larger panel sizes.
Implementation Method 1
The capacitive touch panel detects a touch location by sensing a variation of capacitance between electrodes when there is touch input by, for example, a user's finger.
Data Source
AI summary
A touch screen panel includes: an active region including a first active region and a second active region; first sense patterns including first sense pads arranged in the active region and first connection patterns connecting the first sense pads in a first direction; second sense patterns including second sense pads arranged in the active region and second connection patterns connecting the second sense pads in a second direction that crosses the first direction; and driving patterns arranged between the sense pads and the second sense pads, and connected to the first sense patterns arranged in the second active region.