Touch Panel Conductive Grid Segmentation for Voltage Stability
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Solution Overview
Problem
In existing touch sensing systems, the voltage instability between touch electrodes and conductive network units causes luminance differences during display, resulting in shadows in the image, especially noticeable in flickering pictures.
Innovation Solution
Divide touch electrodes into groups and form insulated conductive network units, ensuring each group operates independently with minimal voltage interference from other groups or network units, using a mesh structure of conductive grids to reduce coupling capacitance and maintain stable voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single conductive network unit is used for all touch electrodes, then the structure is simple, but voltage instability and luminance differences occur due to coupling disturbance
Solution Approach 1:
The patent divides the single conductive network unit into multiple independent conductive network units, with each unit corresponding to a specific group of touch electrodes. This segmentation isolates the coupling disturbance to individual units, preventing it from affecting the entire display area, thereby maintaining voltage stability while keeping each unit's structure relatively simple.
2Speed
If conductive grids are placed between touch electrodes to reduce coupling capacitance, then touch detection speed increases, but voltage instability occurs in the conductive network unit
Solution Approach 1:
By segmenting the conductive network into multiple independent units, the patent localizes the voltage instability issue to specific regions. Each conductive network unit can be independently controlled and compensated, allowing the system to maintain high touch detection speed through conductive grids while managing voltage stability on a localized basis.
Solution Approach 2:
The patent adjusts the voltage parameters applied to different conductive network units dynamically. By changing the voltage application strategy for each unit based on its specific coupling conditions, the system maintains stable display luminance while preserving the fast touch detection capability provided by the conductive grids.
3Stability of the object's composition
If constant voltage is applied to the conductive network unit for display stability, then picture stability is maintained, but luminance differences and shadows appear due to coupling disturbance
Solution Approach 1:
The patent segments the display area into multiple zones corresponding to different conductive network units. Each unit can have its voltage independently adjusted to compensate for local coupling disturbances, ensuring uniform luminance across the entire display while maintaining overall picture stability through coordinated control of all units.
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 eliminates luminance differences between touch electrodes and conductive network units, preventing shadows in displayed images by ensuring synchronized voltage application and reducing disturbances, thus enhancing display quality.
Implementation Method 1
In order to reduce a capacitance between two adjacent touch electrodes 20, each touch electrode 20 is arranged in a conductive grid (i.e. a conductive lattice) 301
Data Source
AI summary
A touch panel and a liquid crystal display device. The touch panel includes a plurality of touch electrodes and a plurality of conductive grids, with each of the plurality of touch electrodes being located inside one of the plurality of conductive grids; a plurality of touch electrodes are divided into at least two groups of touch electrodes, at least two conductive network units insulated from each other are formed by a plurality of conductive grids, and each conductive network unit corresponds to at least one group of touch electrodes.