Display Panel Insulation Openings for Front Light Extraction
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Solution Overview
Problem
Current display devices face inefficiencies in front light emission, which affects the overall performance and brightness of the display.
Innovation Solution
The design includes a substrate with pixels, electrodes, light emitting elements, and insulation layers where the insulation layer has openings that expose the electrodes, allowing for improved light emission efficiency by directing light towards the front of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulation layer completely covers the electrodes and light emitting elements, then electrical insulation and protection are improved, but light emission efficiency and brightness are reduced due to total internal reflection of light
Solution Approach 1:
The patent extracts the insulation layer from completely covering the light emitting elements by creating openings (contact holes) that expose the electrodes and light emitting elements. This allows light to escape directly to the front without being trapped by the insulation layer, while the insulation layer still provides protection in other areas.
Solution Approach 2:
The insulation layer is applied selectively: it covers certain areas for electrical insulation and protection, while leaving openings in specific locations where light emission is required. This local differentiation allows the system to simultaneously achieve both electrical insulation and high light emission efficiency.
2Reliability
If the insulation layer is made thick to ensure complete coverage and protection, then electrical insulation and protection are improved, but light extraction efficiency deteriorates due to increased total internal reflection at the insulation layer interfaces
Solution Approach 1:
By removing the insulation layer in the form of openings at critical locations, the patent enables direct light extraction from the electrodes and light emitting elements without the insulation layer interfering. This maintains adequate insulation thickness in covered areas while eliminating the extraction barrier at emission points.
Solution Approach 2:
The insulation layer is segmented into covered regions and open regions. The covered regions provide electrical insulation and protection, while the open regions facilitate light extraction. This segmentation allows the system to optimize both insulation and light emission functions simultaneously.
3Reliability
If the insulation layer completely encapsulates the light emitting elements, then device protection and electrical isolation are improved, but front light emission efficiency deteriorates due to light being trapped and reflected internally
Solution Approach 1:
The patent extracts the insulation layer from the light emitting elements by forming openings that expose the electrodes and light emitting elements. This allows light to escape directly to the front without being trapped by the insulation layer, while the insulation layer continues to provide device protection in other areas.
Solution Approach 2:
The insulation layer provides different functions in different locations: it offers complete encapsulation and protection in covered areas, while being absent in opening areas to enable efficient light emission. This local quality differentiation resolves the contradiction between protection and light emission.
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 enhances the front light emission efficiency by ensuring that light is emitted in the desired direction, thereby improving the display's brightness and performance.
Implementation Method 1
even if light incident to the insulation layer may be totally reflected in the inside thereof
Data Source
AI summary
A display device includes a substrate including pixels, a first electrode and a second electrode spaced apart from each other, light emitting elements disposed between the first electrode and the second electrode, an insulation layer disposed on the light emitting elements, a first bank overlapping the first electrode and the second electrode, a first area overlapping the first bank, and a second area excluding the first area, wherein the insulation layer includes an opening exposing the first area.