Tilted Circuit Board Pads for Display Misalignment Compensation
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Solution Overview
Problem
Conventional display devices face misalignment issues during pressure bonding due to fabrication and process errors, leading to reliability concerns in the connection between circuit board pads.
Innovation Solution
A display apparatus design featuring flexible and main circuit boards with pads that are tilted at specific angles, allowing for partial overlap and increased contact area, which compensates for misalignment errors during bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flat pads are used for bonding, then the bonding process is simple, but misalignment occurs due to fabrication and process errors leading to contact failure
Solution Approach 1:
The pad structures are designed with tilted surfaces instead of flat surfaces. The first pad has a first tilted surface and the second pad has a second tilted surface, creating a wedge-shaped contact interface that compensates for misalignment errors during bonding processes.
Solution Approach 2:
The pad design changes the geometric parameters by introducing tilt angles. The first tilted surface has a first tilt angle and the second tilted surface has a second tilt angle, where the absolute difference between these angles is greater than or equal to a reference value, allowing compensation for fabrication tolerances.
2Manufacturing precision
If tilted pad structures are implemented, then misalignment compensation is achieved, but the pad structure becomes more complex
Solution Approach 1:
The pad structures are designed with tilted surfaces instead of flat surfaces. The first pad has a first tilted surface and the second pad has a second tilted surface, creating a wedge-shaped contact interface that compensates for misalignment errors during bonding processes.
Solution Approach 2:
The pad design introduces asymmetric tilt angles where the first tilted surface has a first tilt angle and the second tilted surface has a second tilt angle. The absolute difference between these angles is greater than or equal to a reference value, creating an asymmetric structure that compensates for fabrication tolerances.
Data Source
AI summary
Provided is a display apparatus. The display apparatus includes a flexible circuit board including flexible pads, a main circuit board including main pads, and a display panel including a plurality of pixels connected to the flexible circuit board and configured to receive a signal from the driving chip. In each of the flexible pads and the main pads, a portion of the pads is gradually tilted from pads disposed at a center to pads disposed at an outer side among the pads, and a tilted angle of a main pad disposed at the outermost side of the main circuit board is greater than that of a flexible pad disposed at the outermost side of the flexible circuit board.