Multi-layered Wiring Structure for Display Panel Shading
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Solution Overview
Problem
Active matrix organic EL displays experience shading and banding due to wiring resistance delays in gate pulse signal propagation, leading to brightness differences across the panel and visible stripes.
Innovation Solution
A multi-layered wiring structure is implemented, where the drive wiring is formed on a first layer and the data wiring on a second layer, using materials like aluminum to reduce resistance and prevent pulse delays, thereby suppressing shading and banding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer wiring structure is used, then the device complexity is reduced, but pulse signal delays and transient changes occur due to wiring resistance, causing shading and banding
Solution Approach 1:
The patent transitions from a single-layer wiring structure to a multi-layer wiring structure, adding the dimension of vertical layering. The drive wiring is placed on a first wiring layer while the data wiring is placed on a second wiring layer, allowing signals to propagate through different spatial dimensions and reducing resistance-related delays and transient changes that cause shading and banding.
Solution Approach 2:
The patent segments the wiring system into multiple independent layers, with the drive wiring on one layer and data wiring on another layer. This segmentation allows each wiring layer to be optimized independently for its specific signal type, reducing interference and improving signal integrity while maintaining manageable device complexity.
2Loss of time
If wiring resistance is reduced by using materials like aluminum, then pulse signal delays are minimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the material parameter of the wiring from conventional materials to aluminum, which has lower electrical resistance. This parameter change reduces pulse signal delays and transient changes in the drive signal, thereby minimizing shading and banding effects while maintaining acceptable manufacturing precision through standard multi-layer fabrication techniques.
Data Source
AI summary
A pixel circuit includes a switching transistor whose conduction is controlled by a drive signal supplied to the control terminal, a drive wiring adapted to propagate the drive signal, and a data wiring adapted to propagate a data signal. A multi-layered wiring structure is used so that a second wiring layer is formed on a layer different from that on which a first wiring layer is formed.