Display Panel Connection Part Dummy Terminals Thermal Distribution
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Solution Overview
Problem
The increase in the number of signal and scanning lines in display devices leads to longer connection wiring, which enlarges the picture-frame-shaped region and can result in defective connections due to limited terminal pitch and non-uniform thermal distribution during thermal press-bonding.
Innovation Solution
A display device design featuring a connection part with two connection pad groups and a dummy pad group on the array substrate, and corresponding connection terminal groups and dummy terminals on the flexible board, allowing for reduced pitch and preventing defective connections by ensuring uniform thermal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of signal lines and scanning lines is increased, then the amount of information to be displayed is increased, but the length of connection wiring between the flexible board and the signal lines increases, leading to an increase in the size of the picture-frame-shaped region
Solution Approach 1:
The connection part is divided into a first connection section and a second connection section. The first connection section includes connection pad groups arranged in multiple rows, while the second connection section includes connection terminal groups on the flexible board. This segmentation allows for more efficient routing and reduces the overall connection wiring length by distributing connection points across multiple sections rather than using a single long connection path.
2Quantity of substance
If connection terminals are disposed with a reduced pitch to accommodate more terminals, then the number of connection terminals is increased, but a region with no connection terminal occurs on the connection part, causing defective connection during thermal press-bonding
Solution Approach 1:
A dummy terminal group is introduced as an intermediary element between the connection terminal groups. These dummy terminals fill gaps in the terminal arrangement and serve as thermal conduction paths during thermal press-bonding. The dummy terminals ensure uniform thermal distribution across the connection part, preventing defective connections while allowing higher terminal density.
3Quantity of substance
If the pitch of connection terminals is reduced, then the number of terminals per unit length is increased, but thermal distribution during thermal press-bonding becomes non-uniform, causing defective connection
Solution Approach 1:
The connection part is designed with dummy terminals that create a homogeneous thermal distribution pattern during thermal press-bonding. The dummy terminals are strategically placed to ensure that heat is evenly distributed across the entire connection area, including regions with reduced terminal pitch. This homogenization of thermal distribution prevents localized heating issues and ensures reliable bonding across all connection points.
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 reduces the size of the picture-frame-shaped region and prevents defective connections by optimizing the arrangement of connection pads and terminals, achieving a 10% reduction in connection wiring length and a 9.4% reduction in the distance between the array substrate edge and the display section.
Implementation Method 1
when the flexible board is thermal press-bonded to the array substrate, defective connection of the flexible board may occur in the region where there is no connection terminal
Data Source
AI summary
A display device includes a display panel which includes an effective display section, a flexible board which supplies a driving signal to the effective display section, a connection part at which the display panel and the flexible board are connected, and a plurality of connection wiring lines which connect the connection part and the effective display section. The connection part includes a first connection section including at least two connection pad groups, which are composed of connection pads that are connected to the effective display section via the connection wiring lines, and a dummy pad group which is disposed between the connection pad groups, and is composed of dummy pads, and a second connection section including connection terminal groups, which are composed of connection terminals corresponding to the connection pads, and a dummy terminal group which is composed of dummy terminals corresponding to the dummy pads.