TFT Array Panel Touch Sensing Integration
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Solution Overview
Problem
Liquid crystal display (LCD) systems with integrated touch screen panels face increased unit costs, reduced production yield, decreased luminance, and increased thickness, due to the complexity of adding a touch screen panel.
Innovation Solution
A thin film transistor (TFT) array panel design incorporating a sensing unit with a conductive member on a sensing protrusion, connected through contact holes, and a passivation layer, which allows for accurate contact sensing and position determination without the need for an additional touch screen panel, thereby simplifying the manufacturing process and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a touch screen panel is added to an LCD, then contact sensing capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the touch sensing function with the existing LCD array panel by integrating sensing protrusions, conductive members, and passivation layers directly into the TFT array panel structure. This combination eliminates the need for a separate touch screen panel while achieving accurate contact sensing capability.
Solution Approach 2:
The array panel is designed to serve dual functions: display function through pixel electrodes and touch sensing function through sensing protrusions with conductive members. The same panel structure performs both visual display and contact detection, reducing overall system complexity.
2Measurement precision
If a touch screen panel is added to an LCD, then contact sensing capability is improved, but production yield decreases
Solution Approach 1:
By combining touch sensing and display functions into a single integrated panel, the patent eliminates the additional attachment process required for separate touch screens, thereby improving production yield and manufacturing efficiency.
3Measurement precision
If a touch screen panel is added to an LCD, then contact sensing capability is improved, but luminance deteriorates
Solution Approach 1:
The patent uses transparent conductive members and strategically positioned sensing protrusions that minimize obstruction of light paths. The conductive members are designed with appropriate transparency and positioning to maintain display luminance while enabling touch sensing functionality.
4Measurement precision
If a touch screen panel is added to an LCD, then contact sensing capability is improved, but product thickness increases
Solution Approach 1:
The patent integrates the touch sensing structure within the existing panel thickness by incorporating sensing protrusions and conductive members into the array panel's layered structure, eliminating the need for an additional separate touch panel layer.
Data Source
AI summary
A display device includes a first display panel including a common electrode disposed thereon, and a second display panel including; thin film transistors (“TFTs”) each including a gate electrode, a source electrode, and a drain electrode, a first passivation layer disposed on the source and drain electrodes, a second passivation layer disposed on the first passivation layer and including at least one sensing protrusion, pixel electrodes disposed on the second passivation layer and connected with the drain electrode, and at least one conductive member disposed on the sensing protrusion.