Capacitive In-Cell Touch Panel Stacked Layer Aperture Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-cell touch panels face issues with reduced reliability due to the impact of capacitive sensors and touch wires on the aperture ratio of TFT array substrates, leading to compromised touch sensitivity.
Innovation Solution
A capacitive in-cell touch panel design featuring two stacked and intersecting capacitive touch layers with insulation in between, where each layer includes transparent conductive materials and detection lines arranged on a black matrix to enhance sensitivity without blocking display areas, thus maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitive sensors and touch wires are directly added on a conventional TFT array substrate, then touch control function is achieved, but the aperture ratio of the TFT array is affected and touch sensitivity is reduced
Solution Approach 1:
The patent transitions from a single-plane touch electrode arrangement to a three-dimensional stacked configuration with first and second capacitive touch layers positioned at different heights. This vertical dimensionality change allows touch detection lines to be arranged in multiple layers, increasing the effective sensing area without occupying additional horizontal space on the substrate, thereby maintaining aperture ratio while improving touch reliability
Solution Approach 2:
The patent implements a nested structure where the second capacitive touch layer is positioned above and intersects with the first capacitive touch layer. The touch detection lines of both layers are embedded within the substrate structure, with the second layer nested within the vertical space above the first layer. This nesting approach enables dual-layer touch detection without increasing the overall footprint or compromising the aperture ratio
2Reliability
If capacitive sensors and touch wires are directly added on a conventional TFT array substrate, then touch control function is achieved, but touch sensitivity is reduced
Solution Approach 1:
The patent divides the touch detection function into two separate capacitive touch layers, each with its own set of transparent conductive layers and touch detection lines. This segmentation allows each layer to contribute independently to touch sensitivity, with the first layer providing baseline detection and the second layer enhancing sensitivity through additional capacitive coupling. The segmented structure improves touch sensitivity while keeping each individual layer's complexity manageable
Solution Approach 2:
The patent combines multiple functional elements into an integrated stacked structure: transparent conductive layers, touch detection lines, and insulating layers are merged into a unified multi-layer configuration. The first and second capacitive touch layers are positioned in direct vertical alignment, creating a compact integrated sensor assembly that enhances touch sensitivity without proportionally increasing overall device complexity
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 two-layered capacitive touch panel design improves touch sensitivity and reliability while preserving the aperture ratio, enabling effective touch control operations without obstructing the display.
Implementation Method 1
the first transparent conductive layer and the first touch detection line generate capacitive detection and the second transparent conductive layer and the second touch detection line generate capacitive detection
Data Source
AI summary
Disclosed is a capacitive in-cell touch panel, which includes a substrate and a black matrix disposed on the substrate. The capacitive in-cell touch panel further includes a first capacitive touch layer, an insulation layer, and a second capacitive touch layer. The first capacitive touch layer is formed on the black matrix. The insulation layer is formed on the first capacitive touch layer. The second capacitive touch layer is formed on the second capacitive touch layer and is stacked on and intersects the first capacitive touch layer in a grid form. Also disclosed is a display device.