Capacitor Line Structure for Display Device Voltage Stability
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Solution Overview
Problem
High wiring resistance of the power supply line in display devices can cause variations in the power supply voltage, affecting the control of the luminance of the light-emitting element.
Innovation Solution
The display device incorporates a plurality of pixel circuits with a retention capacitor, a drive transistor, and an initialization transistor, featuring a capacitor line that is shared by adjacent pixel circuits, reducing wiring resistance through a specific layer structure and contact hole configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power supply line structure is used, then the device complexity is reduced, but the wiring resistance increases causing voltage variations
Solution Approach 1:
The patent transitions from a planar wiring structure to a three-dimensional stacked structure with capacitor lines in different layers (first capacitor line in first wiring layer, second capacitor line in second wiring layer). This vertical arrangement reduces the effective current path length and resistance while maintaining electrical connectivity through contact holes, thereby improving power supply stability without significantly increasing overall device complexity.
Solution Approach 2:
The power supply line is segmented into multiple separate capacitor lines positioned at different locations (first capacitor line and second capacitor line in respective wiring layers). This segmentation allows current to be distributed through multiple parallel paths, reducing the total resistance and preventing voltage drops that would occur in a single conventional power supply line.
2Reliability
If the capacitor line is shared by adjacent pixel circuits, then the wiring resistance is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The capacitor line structure serves multiple functions: it provides power supply connectivity to multiple adjacent pixel circuits simultaneously, acts as a retention capacitor electrode, and establishes electrical potential stability across the display panel. This multi-functionality reduces the need for separate dedicated wiring for each pixel circuit, thereby reducing overall wiring resistance while the standardized contact hole pattern maintains manufacturing feasibility.
Data Source
AI summary
A display device includes: a plurality of pixel circuits each including a retention capacitor and a drive transistor. Each of those two of the plurality of pixel circuits which are adjacent in a row direction has a first opening in a capacitor line around a first contact hole in a plan view. A retention capacitor is at least partially provided in an overlapping region of a capacitor electrode and the capacitor line. The capacitor line has a second opening between two adjacent first openings and includes a first connecting line and a second connecting line opposite each other in a column direction across the second opening.