Pixel Sub-Capacitor Layout for High-Density Brightness Uniformity
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Solution Overview
Problem
Existing display devices face challenges in efficiently managing the storage of electrical charges for high-resolution displays, particularly in maintaining pixel integrity and brightness uniformity.
Innovation Solution
Incorporation of a sub-capacitor structure within the pixel design, comprising a sub-electrode and a first pixel electrode that overlaps with a storage capacitor, connected in parallel, to enhance charge storage and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional single capacitor structure is used in high-resolution display pixels, then the pixel area can be kept small, but the charge storage capacity is insufficient leading to poor brightness uniformity
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode, second pixel electrode, third pixel electrode) that can be independently connected to different capacitors. This segmentation allows each capacitor to serve a specific function while collectively providing sufficient charge storage capacity within a compact pixel area.
Solution Approach 2:
The sub-capacitor is nested within the pixel structure by positioning its electrodes (first sub-electrode and second sub-electrode) to overlap with existing pixel components. The sub-capacitor's lower electrode overlaps with the first pixel electrode, and the upper electrode is positioned within the pixel area, effectively utilizing vertical space to increase charge storage without expanding the pixel footprint.
2Reliability
If the pixel electrode area is increased to improve charge storage, then brightness uniformity improves, but the display resolution decreases due to reduced pixel density
Solution Approach 1:
The invention transitions from a two-dimensional planar capacitor design to a three-dimensional overlapping structure. The sub-capacitor electrodes are positioned at different vertical levels with overlapping horizontal projections, creating a stacked configuration that increases charge storage capacity without increasing the horizontal pixel area, thereby maintaining high pixel density.
Solution Approach 2:
The pixel electrode is designed with dynamic connectivity, where different segments of the pixel electrode can be selectively connected to different capacitors (storage capacitor, sub-capacitor, compensation capacitor) based on operational requirements. This dynamic configuration allows optimal charge distribution for brightness uniformity while maintaining compact pixel dimensions for high resolution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves charge storage efficiency, leading to enhanced pixel brightness uniformity and resolution in high-density display devices.
Implementation Method 1
a sub-capacitor above the bank, including a sub-electrode and a first pixel electrode overlapping each other with a third insulating layer interposed therebetween
Data Source
AI summary
A display device comprises a substrate divided into emission and non-emission areas, a storage capacitor, a first insulating layer, a first light emitting element and a second light emitting element, a bank in the non-emission area, and defining an opening corresponding to the emission area, a first pixel electrode electrically connected to a first end of the first light emitting element, a second pixel electrode electrically connected to a second end of the second light emitting element, an intermediate electrode between the first pixel electrode and the second pixel electrode, surrounding at least a portion of the first pixel electrode, and electrically connected to a second end of the first light emitting element and to a first end of the second light emitting element, and a sub-electrode electrically connected to a lower electrode of the storage capacitor through a contact hole, and overlapping the first pixel electrode.