Display Panel Pad Layout for Center Voltage Drop Reduction
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Solution Overview
Problem
Display panels experience significant voltage drops in the center during testing, leading to a black screen phenomenon due to increased distance from test pads, which are typically located at the edges, resulting in inadequate signal transmission.
Innovation Solution
The display panel design includes additional pad groups and signal lines positioned further away from the edges, connected by dedicated connection lines in separate layers to reduce resistivity and voltage drops, ensuring uniform signal distribution across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If test pads are located only at the edges of the display panel, then the device complexity is reduced, but voltage drops increase in the center region causing black screen phenomenon
Solution Approach 1:
The patent divides the test pad configuration into multiple groups: first pad groups at the edges and additional first pad groups in the center region. This segmentation allows signal transmission paths to be divided into shorter segments, reducing voltage drops in the center region while maintaining the overall simplicity of the test setup
Solution Approach 2:
The patent introduces additional first pad groups as intermediary elements between the edge pad groups and the center display region. These intermediary pads provide intermediate connection points that reduce the length of signal transmission paths to the center, thereby reducing voltage drops without requiring complete redesign of the entire pad system
2Reliability
If additional pad groups are added to reduce voltage drops, then signal transmission quality improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by placing additional pad groups specifically in the center region where voltage drops are most severe, rather than uniformly distributing pads across the entire panel. This localized approach improves signal transmission quality where needed most while minimizing the overall increase in device complexity
Solution Approach 2:
The patent implements partial action by adding only the necessary additional pad groups in the center region rather than placing pads uniformly across the entire display panel. This selective placement provides sufficient improvement in signal transmission quality without unnecessarily increasing device complexity
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
The solution effectively reduces voltage drops and prevents black screen issues by enhancing signal integrity and distribution, improving the display panel's performance during testing and operation.
Implementation Method 1
An end of each of the plurality of first signal lines adjacent to the first side is electrically connected to a respective one of the plurality of first pads, and an end of each of the plurality of first signal lines adjacent to the second side is electrically connected to a respective one of the plurality of second pads
Implementation Method 2
The peripheral circuit region is further provided with at least one first additional pad group, each of the at least one first additional pad group includes a plurality of first additional pads, and each of the plurality of first additional pads is electrically connected to a respective one of the plurality of the first signal lines
Data Source
AI summary
Provided are a display panel and a display device. A peripheral circuit region is provided with a first pad group, a second pad group and multiple first signal lines. The first pad group includes a plurality of first pads, and the second pad group includes a plurality of second pads. An end of each of the plurality of the first signal lines adjacent to the first side is electrically connected to a respective one of the plurality of first pads, and an end of each of the plurality of the first signal lines adjacent to the second side is electrically connected to a respective one of the plurality of second pads.