Flat Panel Display with Integrated Touch Sensing and Shared FPCB
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Solution Overview
Problem
The integration of a touch screen panel with a flat panel display increases product thickness and manufacturing costs due to separate driving ICs and flexible printed circuit boards, complicating the manufacturing process and reducing compatibility.
Innovation Solution
A capacitive touch screen panel is integrated onto a thin sealing film with sensing cells and lines that extend to a shared FPCB, connected to a driving circuit, minimizing thickness and simplifying the manufacturing process by integrating the driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separately manufactured touch screen panel is attached to a flat panel display, then the touch screen functionality is achieved, but the entire thickness of the product is increased
Solution Approach 1:
The patent merges the touch screen panel with the flat panel display by integrating the touch sensor array directly into the display structure. The touch sensor electrodes are formed on the same substrate as the display pixels, eliminating the need for a separate touch screen panel attachment and reducing overall product thickness.
Solution Approach 2:
The display substrate serves multiple functions: it acts as both the display medium and the touch sensing surface. The same substrate that displays visual information also contains the touch sensor electrodes for detecting user input, making the component universal for both display and touch input functions.
2Adaptability or versatility
If separate driving ICs are used for flat panel display and touch screen panel, then each component can be optimized independently, but manufacturing cost is increased and compatibility is reduced
Solution Approach 1:
The patent combines the driving circuits for both the display and touch screen into a single integrated circuit. This unified driving IC reduces the number of separate components, simplifies manufacturing processes, lowers costs, and improves compatibility between the display and touch functions while still allowing independent optimization of each subsystem.
3Ease of operation
If separate flexible printed circuit boards are used to connect driving ICs, then each component can be independently connected, but the manufacturing process becomes complicated
Solution Approach 1:
The patent merges multiple flexible printed circuit boards into a single FPCB that connects to both the display and touch screen driving circuits. This unified connection approach reduces the number of separate FPCB connections required, simplifies the manufacturing process, and reduces the overall complexity of the assembly while maintaining the ability to independently connect to both display and touch components.
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
This integration reduces product thickness, simplifies manufacturing, and lowers costs by sharing a FPCB, enhancing compatibility and reducing complexity.
Implementation Method 1
The sensing lines extend from the sensing cells along the inclined surface of the encapsulation layer to the second area of the substrate
Data Source
AI summary
A flat panel display having an integrated touch screen panel directly formed on a sealing thin film is disclosed. In the display, sensing lines of the touch screen panel are formed to extend to a substrate of the display panel, on which organic light emitting elements are formed, so that the touch screen panel and the display panel are connected to a flexible printed circuit board, thereby simplifying manufacturing processes and decreasing product cost.