PCB Pad Sub-Terminal Segmentation for Display Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices with printed circuit boards (PCBs) face challenges in testing due to the complexity and alignment of pad terminals, which hinders efficient signal transmission and testing processes.
Innovation Solution
The design includes a display substrate with a pad region containing first and second terminal regions, and a printed circuit board with a base film and second pad portion, featuring sub-pad terminals and test lines for easier testing by allowing probe contact with specific sub-pad terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PCB pad terminals are used with complex alignment, then signal transmission is achieved, but testing becomes difficult and time-consuming
Solution Approach 1:
The pad terminals are divided into functional sub-groups (signal pads, test pads, power pads) with distinct structures. Test pads are specifically designed as separate accessible terminals that can be easily contacted by probes, while signal pads maintain their alignment-based connection structure. This segmentation allows testing to be performed independently without requiring complex alignment procedures.
2Productivity
If pad terminals are densely arranged for better integration, then PCB integration increases, but testing accessibility decreases
Solution Approach 1:
Test pads are positioned at the edge or periphery of the PCB in a separate dimension from the main signal pad array. This spatial separation in another dimension allows probes to access test pads without interfering with the dense arrangement of signal pads, thereby maintaining both high integration and testing accessibility.
3Ease of operation
If test pads are made large for easier probe contact, then testing becomes easier, but the area occupied by test pads increases
Solution Approach 1:
Different regions of the PCB are given different qualities: signal pads have small areas optimized for dense integration, while test pads have larger areas optimized for probe contact. This local differentiation allows each pad type to be optimized for its specific function without compromising the other, with test pads strategically positioned where they need accessibility.
4Manufacturing precision
If complex alignment of pad terminals is used, then precise signal transmission is achieved, but manufacturing complexity increases
Solution Approach 1:
The testing function is extracted from the complex alignment-based pad structure. Test pads are designed as standalone, easily accessible terminals that do not require the precise alignment procedures needed for signal pads. This extraction simplifies the manufacturing process by separating the testing requirement from the complex signal transmission structure.
Data Source
AI summary
A display device includes a display substrate including a display area and a pad region, a first pad portion including a plurality of first pad terminals, the plurality of first pad terminals being arranged in a first direction, and a printed circuit board (PCB) including a base film and a second pad portion. The second pad is electrically connected to the first pad portion. The second pad portion includes a plurality of second pad terminals electrically connected to the plurality of first pad terminals, and a plurality of first test lines. The plurality of second pad terminals includes a plurality of sub-pad terminals. One of the plurality of first lines is connected to a first sub-pad terminal of the plurality of sub-pad terminals, and a second sub-pad terminal of the plurality of sub-pad terminals is not connected to any of the plurality of first lines.