Display Apparatus Conductive Pattern Layering for Stain Reduction
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Solution Overview
Problem
Display apparatuses face the challenge of preventing or minimizing stains in the display area due to anode initial voltage differences caused by capacitance variations between data lines and organic light-emitting diodes.
Innovation Solution
The display apparatus includes a configuration with conductive pattern layers and connection pattern layers positioned on the same layer between display elements and pixel electrodes, which reduces capacitance values and minimizes anode initial voltage differences by increasing the distance between data lines and pixel electrodes, and incorporates shield electrodes to further decrease capacitance and prevent stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data lines are positioned closer to pixel electrodes to reduce wiring complexity, then device complexity is reduced, but capacitance between data lines and pixel electrodes increases causing anode initial voltage differences and stains
Solution Approach 1:
The patent introduces a third dimension (vertical stacking) to resolve the contradiction. By positioning conductive pattern layers and connection pattern layers at different vertical levels between the data line and pixel electrode, the design reduces horizontal spacing while maintaining electrical connection. This multi-layer vertical arrangement decreases the capacitance coupling area between data lines and pixel electrodes, preventing anode initial voltage differences and display stains while keeping the wiring structure compact.
2Reliability
If distance between data lines and pixel electrodes is increased to reduce capacitance, then anode initial voltage differences are minimized, but device area increases
Solution Approach 1:
The patent utilizes vertical layering to achieve effective electrical isolation without increasing horizontal footprint. Multiple conductive and connection pattern layers are stacked vertically between the data line and pixel electrode, creating sufficient insulation distance in the vertical dimension while maintaining compact horizontal spacing. This approach reduces capacitance and prevents display uniformity issues without expanding the overall display area.
Solution Approach 2:
The patent employs a nested multi-layer structure where conductive pattern layers and connection pattern layers are positioned within the vertical space between the data line and pixel electrode. This nested arrangement of multiple functional layers at different vertical levels achieves effective capacitance reduction while efficiently utilizing the available vertical volume, thereby preventing display stains without increasing the horizontal display area.
Data Source
AI summary
A display apparatus includes a first display element including a first pixel electrode and emitting light of a first color, a first conductive pattern layer and a second conductive pattern layer extending in a first direction and spaced apart from each other, and a first connection pattern layer extending in the first direction and electrically connecting the first conductive pattern layer to the second conductive pattern layer, the first connection pattern layer at least partially overlapping the first pixel electrode of the first display element, wherein the first conductive pattern layer and the second conductive pattern layer are disposed on a same layer between the first display element and the first connection pattern layer.