Integrated Touch Electrodes Sloped Boundary Design
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Solution Overview
Problem
The integration of touch screen panels with display devices often results in increased thickness and manufacturing costs due to the separate manufacturing and attachment of these components, leading to potential disconnection failures at the boundary between sealed and non-sealed regions.
Innovation Solution
A display device with touch electrodes formed on both substrates, extending from the sealed region to the non-sealed region via a sloped portion, which reduces the step difference and prevents disconnection failures, while allowing for a thin and flexible design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a touch screen panel is separately manufactured and attached to the display device, then the touch input function is achieved, but the thickness and manufacturing cost increase
Solution Approach 1:
The patent merges the touch screen panel with the display device by forming touch electrodes directly on the substrates of the display device. The first touch electrodes are formed on the upper substrate and extend to the non-sealed region on the lower substrate, while the second touch electrodes are formed on the lower substrate, creating an integrated structure that eliminates the need for separate attachment and reduces overall thickness.
Solution Approach 2:
The substrates of the display device serve dual functions: as structural components for the display and as bases for the touch electrodes. The upper and lower substrates not only contain the display pixels but also host the touch electrode structures, allowing one component to perform multiple functions and reducing the need for additional separate layers.
2Reliability
If a touch screen panel is separately manufactured and attached to the display device, then the touch input function is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the manufacturing processes of the display device and touch screen panel into a single integrated process. The touch electrodes are formed using the same substrate preparation and patterning techniques already employed for the display device, eliminating the need for separate manufacturing and assembly operations, thereby reducing manufacturing cost.
Solution Approach 2:
The same substrates and manufacturing processes are used for both display and touch functions. The upper and lower substrates serve as both display structures and touch electrode bases, allowing universal use of materials and processes, which reduces overall manufacturing complexity and cost.
3Device complexity
If touch electrodes extend from sealed region to non-sealed region, then integration is achieved, but disconnection failure occurs at the boundary
Solution Approach 1:
The patent applies a sloped portion at the boundary between the sealed and non-sealed regions before the touch electrodes are formed. This preliminary structural preparation creates a gradual transition zone that prevents sharp elevation changes, ensuring that the touch electrodes can extend smoothly across the boundary without experiencing stress concentration that would lead to disconnection failure.
Solution Approach 2:
The sloped portion introduces a curved or angled transition at the boundary region instead of a sharp step change. This curvature in the substrate profile allows the touch electrodes to follow a gradual slope, distributing mechanical stress and preventing the formation of weak points that could cause disconnection.
Data Source
AI summary
Provided is a display device integrated with a touch screen panel including a display unit including a plurality of pixels at a sealed region between a lower substrate and an upper substrate; first touch electrodes extending in a first direction on the upper substrate over the sealed region, wherein ends of the first touch electrodes extend to a non-sealed region on the lower substrate; and a sloped portion beneath the first touch electrodes at a boundary between the sealed region and the non-sealed region.