Bankless Display Pixel Electrode Curved Edge Aperture Ratio
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Solution Overview
Problem
Existing display devices face challenges in increasing the aperture ratio while preventing image abnormalities at the edge portions of pixel electrodes, which are often associated with reduced luminous efficiency due to total internal reflection and edge effects.
Innovation Solution
The display device incorporates a structure with a recessed overcoat layer and curved or bent pixel electrode edges, eliminating the need for banks to enhance aperture ratio and reduce edge effects, thereby improving luminous efficiency by minimizing unnecessary light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If banks are disposed on the display panel to define emission areas, then image abnormalities at edge portions are prevented, but the aperture ratio is reduced
Solution Approach 1:
The invention extracts and removes the banks from the display panel structure, transitioning to a bankless design where pixel electrodes directly define emission areas without physical separation ribs, thereby eliminating the aperture ratio reduction caused by banks while maintaining image quality through alternative edge portion configurations
Solution Approach 2:
The invention applies curvature to the edge portions of pixel electrodes, where edge portions are configured with curved or bent shapes rather than straight edges, preventing image abnormalities by distributing electric field concentrations while enabling larger aperture ratios in a bankless structure
2Area of stationary object
If aperture ratio is increased by removing banks, then luminous efficiency improves, but image abnormalities occur at edge portions of pixel electrodes
Solution Approach 1:
The invention uses curved or bent edge portions of pixel electrodes to prevent image abnormalities while maintaining the increased aperture ratio achieved through bankless design, as the curved geometry prevents electric field concentration and associated display defects
Solution Approach 2:
The invention applies different geometric characteristics to different regions of the pixel electrode, with edge portions specifically configured as curved or bent while the central emission area maintains optimal characteristics for light output, thereby locally addressing edge effects without compromising overall aperture ratio
3Ease of manufacture
If flat edge portions are used in pixel electrodes, then manufacturing is simplified, but total internal reflection occurs reducing luminous efficiency
Solution Approach 1:
The invention configures edge portions with curved or bent geometries instead of flat edges, which prevents total internal reflection of light at the electrode edges while remaining compatible with standard manufacturing processes through conventional photolithography patterning
Solution Approach 2:
The invention changes the geometric parameter of edge portions from flat (zero curvature) to curved (non-zero curvature), thereby altering the optical behavior at edges to prevent total internal reflection and improve light extraction efficiency without fundamentally changing the manufacturing process
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
This configuration efficiently increases the aperture ratio, prevents image abnormalities at the edge portions of pixel electrodes, and enhances luminous efficiency by reducing total internal reflection, leading to improved display performance.
Implementation Method 1
improve luminous efficiency by reducing unnecessary total internal reflection of light
Data Source
AI summary
In a display device, an edge portion of a pixel electrode is modified. A valley is provided in an overcoat layer located below the pixel electrode. The edge portion of the pixel electrode is configured to be curved or bent onto the overcoat layer. As a result, the aperture ratio of the display device can be increased, and an image abnormality in the edge portion of the pixel electrode can be prevented.