Dummy Circuit Layout for Flat Panel Display Edge Short Circuits
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Solution Overview
Problem
In flat panel display devices, the high density of metal film at the edge region leads to static electricity accumulation, causing damage to insulating layers and short circuits between dummy scanning lines and outer dummy data lines, resulting in abnormalities like vertical bright lines or poor display.
Innovation Solution
The outer dummy data line is outwardly avoidance disposed to create a staggered projection with the dummy scanning lines, preventing overlap and short circuits, with a gap of 5 μm to 15 μm between the avoidance portion and the end portion of the scanning lines, and an insulating layer is placed between the scanning and data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the outer dummy data line is disposed to overlap with the dummy scanning lines for compact layout, then the device area is reduced, but static electricity accumulation causes short circuits between the lines
Solution Approach 1:
The outer dummy data line is extracted from the overlapping region with dummy scanning lines and repositioned to an avoidance region, separating it from the high static electricity accumulation zones at the edges of the display panel
Solution Approach 2:
An avoidance portion is introduced as an intermediary structural feature that allows the outer dummy data line to bypass the problematic overlapping region, creating a physical separation that prevents direct contact during electrostatic discharge events
2Manufacturing precision
If the dummy scanning lines extend beyond the outer dummy data line to improve uniformity, then the AA area uniformity is improved, but the pointed end portions accumulate static electricity that damages insulating layers
Solution Approach 1:
The outer dummy data line is extracted from the region where it would intersect with the extended dummy scanning lines, removing it from the harmful static electricity accumulation zone while preserving the uniformity benefits of the extended scanning lines
Solution Approach 2:
The outer dummy data line is routed through an avoidance region in a different spatial dimension (outer side of the panel), creating a three-dimensional separation that prevents planar overlap with the dummy scanning lines
Data Source
AI summary
A dummy circuit and a driving circuit of a flat panel display device is provided in the present application, including: a plurality of dummy scanning lines extending in a row direction and separated from each other; a plurality of data lines extending in a column direction and separated from each other, the plurality of data lines including an outer dummy data line in the outermost side; the dummy scanning lines intersecting with the dummy data lines to form a plurality of dummy pixel regions, dummy pixel electrodes provided in the dummy pixel regions; a plurality of thin film transistors connecting the pixel electrode to the corresponding dummy scanning lines and the dummy data lines; and wherein the outer dummy data line corresponding to at least one end portion of the of the dummy scanning line outwardly avoidance disposed to make the projections of the both staggered.