Integrated Touch Display Panel Reducing Parasitic Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch display devices with separate touch panels face issues such as increased thickness, reduced light transmittance, and higher manufacturing costs due to unnecessary parasitic capacitance, which can decrease touch sensing accuracy and aperture ratio.
Innovation Solution
The solution involves arranging touch electrodes and lines to overlap reference and driving voltage lines, connecting these lines through an active layer, and synchronizing the reference voltage with touch driving signals to reduce parasitic capacitance and enhance aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate touch panel is stacked on the display device, then touch sensing function is achieved, but thickness increases and light transmittance decreases
Solution Approach 1:
The patent combines the touch panel and display panel into a single integrated structure where touch electrodes are formed within the same substrate as display electrodes. This merging eliminates the need for a separate stacked touch panel, thereby reducing overall thickness while maintaining touch sensing functionality through the integrated electrode design.
Solution Approach 2:
The patent creates multi-functional electrodes that serve both display and touch sensing purposes. The same substrate and electrode structures are used for both displaying images and detecting touch inputs, allowing a single component to fulfill multiple functions and eliminating the need for additional separate layers.
2Reliability
If a separate touch panel is stacked on the display device, then touch sensing function is achieved, but manufacturing costs increase
Solution Approach 1:
By merging the touch panel and display panel manufacturing processes into a single integrated fabrication sequence, the patent eliminates the need for separate manufacturing steps and assembly operations. This consolidation reduces manufacturing complexity and costs while achieving the same touch sensing functionality.
3Reliability
If touch electrodes and lines are arranged in conventional positions, then touch sensing is achieved, but parasitic capacitance increases and touch sensing accuracy decreases
Solution Approach 1:
The patent applies different spatial arrangements and electrical characteristics to different regions of the electrode structure. By optimizing the local positioning of touch electrodes relative to voltage lines and adjusting local electrical properties, the patent reduces parasitic capacitance in critical sensing areas while maintaining overall touch sensing functionality.
4Reliability
If conductive structures are disposed on or connected to the touchscreen panel, then touch sensing is achieved, but aperture ratio of emission area decreases
Solution Approach 1:
The patent resolves the spatial conflict between conductive structures and emission area by utilizing different vertical layers and three-dimensional positioning. Touch electrodes are positioned in specific layers and orientations that allow conductive structures to coexist with large aperture areas, effectively using dimensional arrangement to minimize overlap and maximize light transmission.
Data Source
AI summary
A touch display device and a display panel are disclosed. Specifically, there may be provided a touch display device comprising a display area in which a plurality of subpixels are arranged in a first direction and a second direction, a reference voltage line extending along the first direction in a first line area between the plurality of subpixels, a data line extending along the first direction in a second line area between the plurality of subpixels, a driving voltage line extending along the first direction in a third line area between the plurality of subpixels, a touch electrode pattern disposed to overlap the reference voltage line or the driving voltage line, and a touch driving circuit applying a touch driving signal to the touch electrode pattern through a touch line and detecting touch according to a change in capacitance.