Display Sensor Coil Layout for Low-Visibility Position Detection
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Solution Overview
Problem
Existing position detection apparatuses in display devices face issues with reduced visibility and inefficient circuit arrangement due to the diagonal arrangement of coils and leader lines, which affect the display's operation and bezel size, particularly in tablet terminals.
Innovation Solution
A sensor design with coils arranged at an angle relative to the display panel's long-side direction, utilizing a multilayer substrate with leader lines connected to the coils at the center of the detection region, allowing for uniform wiring and reduced visibility impact, while maintaining efficient circuit arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the connection point of the leader line and each coil is provided on the center portion of the detection region, then the invalid area outside the detection region is minimized, but the visibility of the display apparatus is reduced
Solution Approach 1:
The patent applies dimensionality change by arranging the sensor substrate in a stacked configuration behind the display panel, moving the leader lines from the display surface plane to a different spatial dimension (depth layer). This allows the leader lines to be positioned at the center of the detection region without interfering with the display visibility, as they exist in a different spatial layer.
Solution Approach 2:
The sensor substrate containing the coils and leader lines is nested within the display module structure, specifically positioned behind the display panel. This nesting arrangement allows the leader lines to be integrated into the overall device structure without occupying display space, resolving the conflict between minimizing invalid area and maintaining visibility.
2Area of stationary object
If the connection point of the leader line and each coil is provided on the center portion of the detection region, then the invalid area outside the detection region is minimized, but the arrangement efficiency of various circuits is reduced
Solution Approach 1:
By positioning the sensor substrate in a stacked configuration behind the display panel, the patent utilizes the depth dimension to separate circuit arrangement from the planar layout constraints. This allows leader lines to converge at the center without compromising the efficiency of circuit arrangement on the back surface, as the two systems operate in different spatial dimensions.
3Object-affected harmful factors
If coils extend in the long-side direction of the detection region, then the magnetic flux generated by the coils affects the operation of the display apparatus, but arranging coils diagonally reduces this influence
Solution Approach 1:
The patent applies asymmetry by arranging the coils diagonally at 45 degrees relative to the gate line direction, rather than parallel to it. This asymmetric orientation reduces the magnetic flux interference that causes moire patterns, while the diagonal configuration becomes a standardized design choice that balances interference reduction with manufacturing feasibility.
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
The sensor design suppresses visibility reduction and enhances circuit arrangement efficiency, improving the accuracy of position detection and equalizing magnetic flux density, thus optimizing the display's performance and bezel size.
Implementation Method 1
a sensor detects an alternating magnetic field transmitted from a position indicator
Implementation Method 2
electromagnetic resonance (EMR) (registered trademark) system of using an electromagnetic wave transmitted by the position detection apparatus through the sensor to generate power in the position indicator
Data Source
AI summary
A sensor includes a first substrate on a back side of a display panel, a first coil extending in a first direction at a predetermined angle between 0 and 90 degrees with respect to a long-side direction of the first substrate and including a first long-side portion provided with first and second end portions, a second coil including a second long-side portion extending in a second direction, a first leader line including a first end and a second end, wherein the first end is connected to the first end portion, and the second end is connected to wiring on a second substrate arranged to extend at a right angle toward the outside of the sensor from one side of the first substrate, and a second leader line including first end connected to the end portion and a second end connected to the wiring on the second substrate.