Display Panel Force Sensing Module Stacked Resistor Structure
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Solution Overview
Problem
Current display panels lack integration of force or pressure touch-control functions, with existing resistive touch technologies increasing panel thickness and reducing touch sensitivity due to strain gauge placement, and capacitive touch panels experiencing signal interference and accuracy issues from adhesive tape gaps.
Innovation Solution
A display panel design featuring a strain gauge with force-sensitive units composed of resistors on different layers, forming a stacked resistor structure to minimize temperature influence and reduce overall dimension, while maintaining sensitivity and accuracy through a two- or three-layered force sensing module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a strain gauge is disposed under the backlight layer of a display panel, then the force touch function can be implemented, but the thickness of the display panel increases
Solution Approach 1:
The patent transitions from a single-layer strain gauge structure to a multi-layer stacked resistor structure. By arranging force-sensitive resistors on different layers (first force-sensitive resistor layer and second force-sensitive resistor layer) and connecting them through through-holes, the invention utilizes the vertical dimension to reduce the horizontal surface area required, thereby maintaining force touch functionality while reducing overall panel thickness.
2Adaptability or versatility
If a strain gauge is disposed under the backlight layer, then the force touch function is achieved, but the sensitivity of finger touch is weakened
Solution Approach 1:
The stacked resistor structure distributes force-sensitive elements across multiple layers, increasing the effective sensing area in the vertical dimension while maintaining compact horizontal footprint. This multi-layer configuration enhances touch sensitivity by providing more force-sensitive resistors that can detect finger touch forces more effectively compared to a single-layer structure.
Solution Approach 2:
The invention employs a composite structure combining multiple force-sensitive resistor layers with different orientations (some resistors parallel to X-axis, others parallel to Y-axis) and connecting structures (through-holes with conductive material). This composite arrangement optimizes the mechanical response to force applied at different angles and positions, thereby improving overall touch sensitivity.
3Measurement precision
If the surface area of force-sensitive units is reduced, then the touch sensitivity and accuracy are enhanced, but the temperature variance increases
Solution Approach 1:
By stacking force-sensitive resistors on multiple layers, the invention reduces the horizontal surface area of each individual force-sensitive unit while maintaining the total sensing capacity through vertical distribution. This multi-layer configuration minimizes temperature variance across the sensing area, as smaller units experience more uniform temperature distribution, thereby improving touch accuracy without sacrificing sensitivity.
4Length of stationary object
If resistors are arranged on different layers in a stacked structure, then the overall dimension is reduced and temperature influence is minimized, but the device complexity increases
Solution Approach 1:
The patent implements a stacked resistor structure with force-sensitive resistors arranged on different layers (first and second force-sensitive resistor layers) connected through through-holes. This vertical stacking approach reduces the horizontal footprint and overall dimension of the force sensing module while systematically managing the increased structural complexity through organized layering and standardized connection methods.
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 solution enhances touch sensitivity and accuracy by reducing the surface area of force-sensitive units, minimizing temperature variance, and maintaining a compact design, thereby improving the signal-to-noise ratio and operational efficiency of force touch detection.
Implementation Method 1
each force-sensitive unit includes at least two force-sensitive resistors disposed on different layers
Data Source
AI summary
A display panel is provided. The display panel includes a first substrate; a second substrate arranged in opposite to the first substrate; and at least one group of force sensing modules. Each force sensing module include a plurality of force-sensitive units, and each force-sensitive unit includes at least two force-sensitive resistors disposed on different layers.