Touch Display Device Integrating Force Sensing Electrodes
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Solution Overview
Problem
Current touch display devices face challenges in thickness, manufacturing cost, and reliability due to the integration of force sensors, which are often bulky and costly.
Innovation Solution
A touch display device design featuring a first and second substrate with a display medium layer in between, along with pixel, driving, touch-sensing, and force-sensing electrodes, where the driving electrodes serve multiple modes, and the touch-sensing and force-sensing electrodes are strategically disposed to enable both touch and force-touch sensing, reducing thickness and manufacturing costs while enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If force sensors are attached under the display panel to perform force sensing function, then force sensing capability is improved, but device thickness increases and manufacturing cost increases
Solution Approach 1:
The patent combines the force sensing function with the existing display structure by integrating force sensing electrodes into the display panel itself, merging multiple functions (display and force sensing) into a single integrated structure, thereby eliminating the need for separate force sensors that would increase thickness
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both the display medium and the force sensing structure. The driving electrodes and sensing electrodes within the display panel are used to detect both touch position and force magnitude, making the display panel a multi-functional component
2Adaptability or versatility
If force sensors are attached under the display panel to perform force sensing function, then force sensing capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the force sensing function with the existing display manufacturing process, using the same substrate, electrodes, and fabrication techniques already required for the display panel, thereby avoiding additional manufacturing steps and reducing overall production cost
Solution Approach 2:
The display panel components (substrate, electrodes, insulation layers) are designed to perform both display and force sensing functions, eliminating the need for separate force sensor components and their associated manufacturing processes
3Adaptability or versatility
If force sensors are attached under the display panel to perform force sensing function, then force sensing capability is improved, but device reliability deteriorates
Solution Approach 1:
The patent integrates the force sensing function within the sealed display panel structure, protecting the sensing electrodes from environmental factors such as moisture and oxidation, thereby improving long-term reliability compared to external force sensors that would be exposed to the environment
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
The solution allows for simultaneous touch and force-touch sensing, improving device reliability and reducing thickness and manufacturing costs by integrating sensing electrodes within the device structure, enabling various operations while maintaining display quality.
Implementation Method 1
a plurality of touch-sensing electrodes disposed on one of the first substrate and the second substrate, and a plurality of force-sensing electrodes disposed on the second substrate
Data Source
AI summary
A touch display device including a first substrate, a second substrate, a display medium layer, a plurality of pixel electrodes, a plurality of driving electrodes, a plurality of touch sensing electrodes, and a plurality of force-sensing electrodes is provided. The second substrate is opposite to the first substrate. The display medium layer is disposed between the first substrate and the second substrate. The pixel electrodes are disposed on the first substrate. The driving electrodes are disposed on the first substrate and overlap over the pixel electrodes. The touch sensing electrodes are disposed on one of the first substrate and the second substrate. The force-sensing electrodes are disposed on the second substrate, wherein an arrangement direction of the force-sensing electrodes is parallel to an arrangement direction of the touch sensing electrodes. A driving method of the touch display device is also provided.