Active Matrix Display Wiring for Voltage Drop Suppression
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Solution Overview
Problem
Large-sized electro luminescence display devices experience voltage drops in current supply lines, leading to display variations due to uneven voltage application across regions.
Innovation Solution
The active matrix display device employs a wiring structure with multiple current supply lines extending parallel to each other, intersecting with additional wirings that connect to separate current input terminals, distributing the current load and preventing local voltage drops by providing multiple current paths to light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display device is enlarged to increase size, then the display area is increased, but voltage drop occurs in current supply lines causing display variations
Solution Approach 1:
The patent divides the single current supply path into multiple parallel current supply lines (first and second current supply lines). Each line is connected to separate current input terminals, segmenting the current load distribution and reducing voltage drop in each individual line while maintaining adequate current supply to the light emitting element.
2Device complexity
If a single current supply line is used, then the wiring structure is simple, but voltage drop causes display variations among regions
Solution Approach 1:
The patent combines multiple current supply lines (first and second current supply lines) in parallel to supply current to the same light emitting element. This merging approach distributes current through multiple paths, reducing voltage drop and improving display uniformity across different regions of the enlarged display.
Data Source
AI summary
A display device in which the current load of wirings are distributed and display variations due to voltage drop are suppressed. An active matrix display device of the invention comprises a first current input terminal, a second current input terminal, and a plurality of current supply lines extending parallel to each other. Each current supply line is connected to a plurality of driving transistors in a line. One end of each current supply line is connected to the first current input terminal via a first wiring intersecting with the current supply lines, and the other end thereof is connected to the second current input terminal via a second wiring intersecting with the current supply lines. Accordingly, a current is supplied to each current supply line from both the first and the second current input terminals. The first and the second current input terminals are provided separately from each other.