Single-Layer Touch Electrode Structure for Display Panels
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Solution Overview
Problem
Touch display devices face challenges in manufacturing due to complex processes, low yield, and high costs associated with multi-layered touch sensor structures, as well as increased complexity and cost from the need for numerous touch pads and mask processes.
Innovation Solution
A touch display device with a single-layered touch sensor structure that reduces the number of mask processes, touch pads, and manufacturing complexity, while maintaining touch sensitivity by using intersecting X-touch and Y-touch electrode lines with varying widths and connecting lines to connect adjacent electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered touch sensor structure is used, then touch sensitivity can be improved, but manufacturing complexity increases and manufacturing yield decreases
Solution Approach 1:
The patent combines multiple touch sensor layers into a single integrated touch electrode layer. The touch electrode layer includes both sensing electrodes and connecting lines that perform multiple functions simultaneously, eliminating the need for separate layers and reducing manufacturing complexity while maintaining touch sensitivity.
Solution Approach 2:
The touch electrode layer serves multiple functions: it acts as both the sensing element and the connecting element for external electrodes. This multi-functional design reduces the number of required layers and simplifies the manufacturing process while preserving touch detection capability.
2Adaptability or versatility
If the number of touch pads is increased to accommodate more touch electrodes, then touch functionality is improved, but pad area design becomes more difficult and manufacturing cost increases
Solution Approach 1:
The patent transitions from a planar arrangement of multiple touch pads to a layered three-dimensional structure. By stacking touch electrode layers, the system accommodates more touch electrodes without proportionally increasing the pad area, effectively utilizing the vertical dimension to resolve the contradiction between functionality and design complexity.
3Manufacturing precision
If multiple mask processes are used to create precise touch electrode patterns, then manufacturing precision is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent merges multiple patterning steps into fewer mask processes by designing the touch electrode layer to accommodate both sensing electrodes and connecting lines in a single patterned layer. This reduces the number of mask processes required while maintaining the necessary manufacturing precision through optimized electrode geometry and arrangement.
Data Source
AI summary
A touch display device includes: a display panel comprising: a plurality of subpixels; and a plurality of touch electrodes; and a touch sensing circuit configured to: supply a touch driving signal to the display panel; and detect a touch sensing signal to sense a touch, wherein the plurality of touch electrodes comprises: a plurality of X-touch electrode (XTE) lines, each comprising a plurality of XTEs, the plurality of XTE connecting lines being configured to connect adjacent XTEs to each other, among the plurality of XTEs, and a plurality of Y-touch electrode (YTE) lines intersecting the plurality of XTE lines, each YTE line comprising a plurality of YTEs, the plurality of YTE connecting lines being configured to connect adjacent YTEs to each other, and wherein at least two YTE connecting lines, among the plurality of YTE connecting lines, are between two neighboring subpixels of the plurality of subpixels.