Pixel Transistor and Piezoelectric Sensor Integration
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Solution Overview
Problem
Current display panels with touch sensors that recognize touch pressure and intensity are complex and costly to implement, requiring increased complexity in processes and materials.
Innovation Solution
A pixel design incorporating a pixel transistor, piezoelectric sensor, and sensing transistor with shared materials and structures, allowing for touch pressure recognition without excessive mask increases, featuring a gate electrode, active pattern, and touch electrodes formed from conductive materials like aluminum and copper, and oxide semiconductor patterns for simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a touch sensor capable of recognizing touch pressure intensity is implemented in the display panel, then the touch sensing capability is improved, but the process complexity and manufacturing cost increase
Solution Approach 1:
The pixel transistor gate electrode and the piezoelectric sensor's first touch electrode are merged into a single structure formed by the same material layer. This integration eliminates the need for separate electrode structures, reducing process complexity while maintaining touch pressure sensing capability through the piezoelectric effect in the active pattern
Solution Approach 2:
The active pattern serves multiple functions: it acts as the semiconductor layer for the pixel transistor, provides piezoelectric sensing capability for touch pressure detection, and forms part of the electrode structure. This multi-functionality reduces the number of separate components and manufacturing steps required
2Reliability
If separate electrode patterns are used for pixel transistor and piezoelectric sensor, then the functional performance is maintained, but the number of masks and manufacturing steps increase
Solution Approach 1:
The gate electrode of the pixel transistor and the first touch electrode of the piezoelectric sensor are combined into a single conductive layer formed through the same photolithography mask process. This merging maintains the electrical functionality of both components while significantly reducing the total number of masks required for manufacturing
3Measurement precision
If complex multi-layer electrode structures are implemented, then the touch sensing precision is improved, but the manufacturing cost increases
Solution Approach 1:
The gate electrode and first touch electrode are formed from the same material layer with uniform properties, eliminating the need for multiple different material depositions and associated processing steps. This homogeneous approach maintains electrical performance while reducing manufacturing complexity and cost
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 effective recognition of touch pressure with reduced manufacturing complexity and cost, by using shared materials and processes for the pixel and piezoelectric patterns, thereby simplifying the manufacturing process and maintaining efficiency in touch sensor functionality.
Implementation Method 1
a piezoelectric sensor including a first touch electrode provided on the substrate and a piezoelectric pattern provided on the first touch electrode... When a touch of a user occurs around the pixel, voltage levels of the piezoelectric pattern and the first sensing electrode are changed by the touch
Data Source
AI summary
There is provided a pixel. The pixel includes a pixel transistor including a gate electrode provided on a substrate and protruding from a scan line, an active pattern provided on the gate electrode, a first electrode provided on the active pattern, and a second electrode provided on the active pattern and protruding from a data line and a piezoelectric sensor including a first touch electrode provided on the substrate and a piezoelectric pattern provided on the first touch electrode. The gate electrode and the first touch electrode are formed of a same material. The active pattern and the piezoelectric pattern are formed of a same material.