Display Apparatus Dummy Wiring Electrostatic Breakdown Prevention
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Solution Overview
Problem
In display apparatuses, the placement of dummy wirings adjacent to signal wirings can lead to electrostatic breakdown, causing display failures due to static electricity, especially when the conductive patterns are fine and densely packed, resulting in increased signal source impedance and visual defects like dark or bright lines in the displayed image.
Innovation Solution
A display apparatus design where a third conductive pattern is placed adjacent to the first or second conductive patterns with a greater separation distance from peripheral conductors, and an insulating layer with overlapping fourth conductive patterns on one surface, which are smaller than the first or second conductive patterns, or have no overlap, to prevent electrostatic breakdown by maintaining the same width and separation distance as the first or second conductive patterns and being branched to connect with the supply parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dummy wirings are placed adjacent to signal wirings to prevent etching-induced thinning, then wiring width uniformity is improved, but electrostatic breakdown risk increases
Solution Approach 1:
The dummy wiring is designed with non-uniform width along its length, with the width gradually changing from one end to the other. This local variation in geometry allows the wiring to maintain adequate electrostatic clearance from peripheral conductors while still providing the necessary etching protection to adjacent signal wirings.
Solution Approach 2:
The dummy wiring employs asymmetric width distribution, being wider at one end and narrower at the other, rather than maintaining constant width. This asymmetric design creates a gradient that manages electrostatic field distribution, reducing breakdown risk while maintaining manufacturing precision benefits.
2Area of stationary object
If conductive patterns are made finer to reduce frame width, then display area ratio is improved, but signal source impedance increases
Solution Approach 1:
The dummy wiring is merged with the peripheral conductor structure, forming an integrated conductive system. This combination allows the dummy wiring to function both as a structural element and as part of the signal transmission network, reducing overall impedance while maintaining fine pitch for high display area ratio.
3Manufacturing precision
If dummy wirings are placed adjacent to gate wirings to prevent thinning, then wiring thickness uniformity is improved, but display failure risk increases due to electrostatic breakdown
Solution Approach 1:
The dummy wiring implements local quality variation through non-uniform width distribution, creating zones of different electrostatic protection along its length. This allows adequate clearance from peripheral conductors in critical areas while maintaining etching protection in other areas, preventing display failure.
Solution Approach 2:
The dummy wiring extends in the vertical direction (along the gate wiring length) rather than only horizontally, creating a three-dimensional protective structure. This vertical extension provides etching protection to multiple gate wirings simultaneously while managing electrostatic interactions through controlled width variation.
Data Source
AI summary
Provided is a display device capable of suppressing electrostatic breakdown due to dummy wiring even when the dummy wiring is arranged adjacent to signal wiring supplying a display region with a driving signal.Two first supply circuit boards supply the display pixels in each row with a scanning signal, and four second supply circuit boards supply the display pixels in each column with a data signal. Dummy wiring is arranged at the position on the board adjacent to the outermost scanning signal wiring of a plurality of scanning signal wirings connected to each first supply circuit board. The offset distance from the dummy wiring to the peripheral conductor excluding the scanning signal wiring is longer than the offset distance between the dummy wiring and the scanning signal wiring.