Multi-Touch LCD Panel with Segmented Electrodes and Spacers
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Solution Overview
Problem
Conventional resistive touch panels are limited to detecting a single touch position at a time, preventing multi-touch control in liquid crystal display (LCD) applications, which restricts the functionality of touch-controlled displays.
Innovation Solution
A touch-controlled LCD design featuring a liquid crystal display panel with a touch panel comprising parallel first electrodes, a plate-shaped second electrode, and spacers, along with a detecting circuit that sequentially scans the electrodes to determine touch coordinates, enabling multi-touch control by measuring distributed voltages across the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional resistive touch panel is used, then the manufacturing process is simple and cost is low, but only one touch position can be detected at a time
Solution Approach 1:
The touch panel is segmented into multiple independent first electrodes arranged in parallel, rather than using a single continuous conductive layer. Each first electrode can independently detect touch events, enabling multi-touch capability while maintaining a relatively simple overall structure
Solution Approach 2:
The invention transitions from detecting touch position in one dimension (single point) to detecting touch positions across multiple dimensions by introducing multiple parallel first electrodes, allowing simultaneous detection of multiple touch points across the panel surface
2Adaptability or versatility
If multiple touch positions are detected simultaneously, then multi-touch control is enabled, but the detection precision may be affected
Solution Approach 1:
By dividing the touch detection function into multiple separate first electrodes, each electrode can independently and accurately detect touch events in its specific region, maintaining high precision for each touch point even when multiple touches occur simultaneously across different electrodes
Solution Approach 2:
Each first electrode is optimized for local touch detection in its specific region, with the plate-shaped second electrode providing uniform electric field distribution across all electrode regions, ensuring consistent detection precision across the entire touch panel surface
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
Enables accurate detection and calculation of multiple touch points, allowing for multi-touch control in LCDs, thereby expanding the application possibilities of touch-controlled displays.
Implementation Method 1
A touch panel of a typical LCD normally includes an upper conductive substrate, a lower conductive substrate, and a spacer disposed therebetween. The upper and lower conductive substrates respectively include a substrate and a conductive film covered thereon. The conductive film can be an ITO (Indium Tin Oxide) film. A resistive touch panel usually detects the touching position by sensing a distributed voltage
Data Source
AI summary
A touch-controlled LCD includes a liquid crystal display panel and a touch panel. The liquid crystal display panel includes a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate. The touch panel is disposed on a side of the second substrate facing away from the liquid crystal layer. The touch panel includes a plurality of first electrodes being parallel to each other, a plate shaped second electrodes facing the first electrodes, and a plurality of spacers disposed between the first electrodes and the second electrode.