Flexible Display Pad Alignment via Virtual Elongation Lines
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Solution Overview
Problem
Flexible display panels face misalignment and circuit disconnection issues during the binding process due to size changes caused by adhering a back film, which reduces yield and reliability.
Innovation Solution
A display apparatus with output and input pads arranged in a specific configuration, where virtual elongation lines intersect at common datum lines, allowing for crimp connections and adjustments to maintain alignment despite size changes, using a method that aligns markers and adjusts positions based on distance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a back film is adhered to the flexible display panel, then the flexible substrate is planarized, but the flexible display panel changes size slightly causing misalignment between pads
Solution Approach 1:
The patent applies preliminary action by pre-compensating for the size change that occurs when the back film is adhered. The flexible display panel is designed with predetermined dimensions before back film attachment, and the binding position is pre-calculated to account for the expected size change. This allows the pads to remain aligned after the back film is attached, resolving the contradiction between achieving planarity and maintaining alignment precision.
2Shape
If the flexible display panel size changes after back film attachment, then planarity is improved, but circuit connection reliability deteriorates due to misalignment
Solution Approach 1:
The patent designs the flexible display panel with predetermined dimensions and pre-calculates the binding position before the back film is attached. This preliminary action compensates for the size change that will occur during back film attachment, ensuring that the pads remain aligned and circuit connections remain reliable. The CHINESE patent specifically mentions that the binding position is determined based on the predetermined size of the flexible display panel, which accounts for the expected dimensional changes.
3Ease of manufacture
If conventional binding methods are used, then the process is simple, but misalignment occurs causing disconnection and reduced yield
Solution Approach 1:
The patent improves yield by applying preliminary action through pre-determining the flexible display panel dimensions and pre-calculating the binding position before assembly. This preliminary design stage accounts for size changes during manufacturing, ensuring accurate pad alignment during the binding process. The method maintains relatively simple manufacturing procedures while significantly improving yield by preventing misalignment-related failures.
Data Source
AI summary
Embodiments of the present application provide a display apparatus and a method for binding the same. The apparatus includes: a flexible display panel; and a chip on film bound on a binding region of the flexible display panel. The chip on film has at least two rows of output pads and the flexible display panel has at least two rows of input pads. Virtual elongation lines of all of the output pads intersect at a same intersection point in a first datum line perpendicular to the first direction. The output pads are electrically connected to the input pads and the output pads and the input pads have the virtual elongation lines at a same angle with respect to a common datum line, the common datum line being composed of the first datum line and the second datum line coinciding with each other.