Integrated Touch Display Panel Fabrication via Layer Merging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch display panels face challenges in fabrication due to uneven surfaces caused by display driving circuits, leading to increased difficulty in attaching touch panels and reduced yield, especially when integrating touch-sensing and active device array layers separately.
Innovation Solution
Integrating the touch-sensing device layer and active device array layer on the same substrate, with a black matrix, dielectric layer, and display driving circuit on one substrate, and a color filter layer and common electrode on another, allowing for a liquid crystal layer between them, which simplifies the fabrication process and eliminates the need for additional attaching steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch panel is attached to the liquid crystal display module separately, then the touch-sensing function and display function are implemented, but the fabrication process becomes complex and the surface becomes uneven due to the display driving circuit
Solution Approach 1:
The patent integrates the touch-sensing device layer and active device array layer on the same substrate, merging previously separate fabrication processes into a single unified process. This eliminates the need for separate attaching steps and reduces fabrication complexity while maintaining both touch-sensing and display functions.
Solution Approach 2:
The substrate is designed to serve multiple functions simultaneously: it supports both the touch-sensing device layer and the active device array layer, combining touch interface and display drive capabilities in a single structure, thereby simplifying the overall device architecture and fabrication process.
2Manufacturing precision
If the display driving circuit is mounted on the outer lead bonding area, then the display function is achieved, but the surface becomes uneven causing attaching difficulty
Solution Approach 1:
The display driving circuit is integrated into the active device array layer on the same substrate as the touch-sensing layer, eliminating the need for separate mounting on the outer lead bonding area. This integration maintains surface flatness and eliminates attaching difficulties while achieving both display and touch functions.
3Reliability
If a protection cover is added to protect the touch-sensing layer, then the touch-sensing layer is protected, but additional fabrication process steps are required affecting yield
Solution Approach 1:
The substrate serves as both the structural support and the protective element for the touch-sensing layer, eliminating the need for a separate protection cover. This multi-functional design maintains layer protection while reducing fabrication steps and improving yield.
Data Source
AI summary
A touch display panel including an active device array substrate, an opposite substrate and a liquid crystal layer is provided. The active device array substrate includes a first substrate, a black matrix, a touch-sensing device layer, a dielectric layer and an active device array layer. The black matrix is disposed on the first substrate. The touch-sensing device layer is disposed on the first substrate to cover a portion of the black matrix. The dielectric layer covers the touch-sensing device layer. The active device array layer is disposed on the dielectric layer. The touch-sensing device layer and the active device array substrate are located at two opposite sides of the dielectric layer. The liquid crystal layer is disposed between the active device array layer and the opposite substrate. Moreover, a fabricating method of the touch display panel is also provided.