Non-volatile Display Connecting Pad Layout
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Solution Overview
Problem
Conventional electrophoretic display apparatuses suffer from non-effective display areas due to the placement of connecting pads, leading to waste during cutting and increased material costs, especially as device sizes decrease.
Innovation Solution
The connecting pad is disposed within the pixel electrode-distributed rectangular area, allowing for a concave polygonal distribution that eliminates the need for reserved protruding parts during cutting, enhancing cutting utility and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting pad is disposed outside the display surface to electrically connect the common electrode layer with the driving substrate, then the electrical connection is achieved, but a non-effective area is created and cutting utility is reduced
Solution Approach 1:
The connecting pad is moved from a position outside the display surface (2D plane) to a position within the display surface area, utilizing the third dimension of spatial arrangement. This allows the connecting pad to be integrated within the rectangular area formed by pixel electrodes, transforming the upper substrate shape from a concavo polygon to a rectangle, thereby eliminating waste parts during cutting while maintaining electrical connection functionality
2Reliability
If the connecting pad is disposed outside the display surface, then the electrical connection is established, but the upper substrate becomes a concavo polygon causing waste parts during cutting
Solution Approach 1:
The connecting pad is merged with the rectangular area formed by pixel electrodes by disposing it within this area. This merging eliminates the need for a protruding part in the upper substrate, transforming its shape from a concavo polygon to a rectangle, thereby eliminating waste parts during cutting while maintaining the electrical connection between the common electrode layer and the driving substrate
3Productivity
If the connecting pad is disposed within the pixel electrode-distributed rectangular area, then cutting utility is enhanced and waste is eliminated, but the display area is reduced
Solution Approach 1:
The connecting pad is disposed within the rectangular area formed by pixel electrodes, specifically in a location where it does not interfere with the effective display area. This local arrangement allows the upper substrate to be a rectangle for improved cutting utility while maintaining the effective display area, as the connecting pad occupies only a small portion of the rectangular area and can be positioned in a non-critical display region
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 approach significantly improves cutting efficiency and speed, minimizing waste and lowering material costs by ensuring a rectangular cut without reserved areas, while maintaining effective display functionality.
Implementation Method 1
an electrophoretic display apparatus (EPD), using an electrophoretic material
Implementation Method 2
the common electrode layer 15 and the connecting pad 113 are electrically connected via the conductive gel S
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
There is disclosed a non-volatile display apparatus (2) including a driving substrate (21) and a non-volatile display material (22). The driving substrate has a connecting pad and a plurality of pixel electrodes that are distributed in X columns and Y rows. The non-volatile display material is disposed on one side of the driving substrate. The X columns and the Y rows form a rectangular area, in which the connecting pad is at least partially disposed.