Display Panel Bump Electrode Layout for Stable Signal Bonding
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Solution Overview
Problem
Existing display devices face challenges in achieving optimal electrical connection characteristics between pad electrodes and bump electrodes, leading to inefficiencies in signal transmission.
Innovation Solution
The display device incorporates a design with first and second bump electrodes of varying sizes and arrangements, featuring larger contact areas and protruding members made of metal, along with a non-conductive adhesive layer, to enhance electrical connectivity between the driving unit and pad electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform bump electrodes are used for all pad electrodes, then manufacturing is simplified, but electrical connection characteristics cannot be optimized for different signal requirements
Solution Approach 1:
The patent applies local quality by differentiating bump electrode designs based on their specific functional requirements. First bump electrodes have larger contact areas for power signal transmission, while second bump electrodes have smaller contact areas for control signals. This localized optimization of bump electrode characteristics improves electrical connection reliability without requiring complete redesign of all bump electrodes.
Solution Approach 2:
The patent segments the bump electrode array into distinct groups (first bump electrodes and second bump electrodes) with different geometries and electrical characteristics. This segmentation allows each group to be optimized independently for its specific signal type, resolving the contradiction between uniform manufacturing and optimized electrical performance.
2Reliability
If larger contact areas are used for all bump electrodes, then electrical connection stability improves, but signal transmission efficiency for control signals deteriorates due to excessive capacitance
Solution Approach 1:
The patent applies local quality by assigning different contact area sizes to different bump electrode groups based on their signal requirements. First bump electrodes transmitting power signals have larger contact areas for stability, while second bump electrodes for control signals have smaller contact areas to maintain transmission efficiency. This resolves the contradiction between connection stability and signal efficiency.
3Area of stationary object
If bump electrodes are arranged densely to reduce device area, then device compactness improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the bump electrode arrangement into different density zones and patterns. First bump electrodes are arranged with certain spacing for power signals, while second bump electrodes are arranged differently for control signals. This segmented arrangement allows optimized spacing that balances device compactness with manufacturable alignment tolerances.
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 design improves electrical connection stability and efficiency, ensuring reliable signal transmission and enhanced performance of the display device.
Implementation Method 1
a bonding layer covering the plurality of protruding members and including a metal
Implementation Method 2
a first adhesive layer that is disposed between the display panel and the driving unit and bonds the display panel to the driving unit
Data Source
AI summary
A display device includes a display panel including a non-display region in which a plurality of pad electrodes are disposed, and a driving unit including a plurality of bump electrodes. The bump electrodes include a plurality of first bump electrodes and a plurality of second bump electrodes. Each of the first bump electrodes and the second bump electrodes includes a plurality of protruding members, and a bonding layer covering the plurality of protruding members. A first area of each of the plurality of first bump electrodes is larger than a second area of each of the plurality of second bump electrodes. A first contact area between the bonding layer of each of the first bump electrodes and a first pad electrode is larger than a second contact area between the bonding layer of each of the second bump electrodes and a second pad electrode.