Multilayer Reflective Display Structure for Lower Light Loss
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Solution Overview
Problem
Current display devices face inefficiencies in light output due to significant light loss to the lower portions of the panel, which reduces overall light emission efficiency.
Innovation Solution
A display device design featuring an insulating reflective layer with alternating layers of silicon oxide and silicon nitride or titanium oxide, stacked to refract light emitted by light emitting elements, ensuring that light is reflected and directed forward, minimizing loss to the lower panel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional display panel structure is used, then the device is simple in structure, but light loss to lower portions is significant, reducing light output efficiency
Solution Approach 1:
The insulating reflective layer is divided into multiple alternating layers of first insulating material and second insulating material with different refractive indexes. This segmentation creates multiple interfaces for light reflection and refraction, significantly improving light output efficiency by redirecting light that would otherwise be lost to lower portions of the panel.
Solution Approach 2:
The patent uses composite material structure with alternating layers of different insulating materials (e.g., silicon oxide and silicon nitride, or silicon oxide and titanium oxide) having different refractive indexes. This composite structure enhances light manipulation capabilities compared to a single-material layer, achieving higher reflectance and light output efficiency.
2Productivity
If light emitting elements are disposed between electrodes, then light emission function is achieved, but light emitted to lower portions is lost, reducing overall efficiency
Solution Approach 1:
The patent converts the harmful light loss to lower portions into a beneficial effect by using the insulating reflective layer to reflect and redirect this light back toward the viewer. The alternating layers with different refractive indexes create multiple reflection interfaces that capture and redirect light that would otherwise be wasted, transforming energy loss into useful light output.
Solution Approach 2:
The insulating reflective layer acts as an intermediary between the light emitting elements and the lower portions of the panel. Instead of light directly traveling to and being lost in the lower portions, the reflective layer intercepts this light and redirects it forward, mediating the light path to prevent energy loss.
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 light output efficiency by reflecting light emitted from the lower portions of light emitting elements back towards the viewer, thereby improving the overall luminance and reducing light loss, as demonstrated by increased reflectance and light output percentages.
Implementation Method 1
A refractive index of the plurality of first layers of the insulating reflective layer may be smaller than a refractive index of the plurality of second layers of the insulating reflective layer
Implementation Method 2
This configuration enhances light output efficiency by reflecting light emitted from the lower portions of light emitting elements back towards the viewer
Data Source
AI summary
A display device includes a substrate including a plurality of pixels, a first electrode and a second electrode disposed on the substrate and spaced apart from each other, an insulating reflective layer disposed on the first electrode and the second electrode, and a plurality of light emitting elements disposed between the first electrode and the second electrode and electrically connected to the first electrode and the second electrode, wherein the insulating reflective layer includes a plurality of first layers and the plurality of second layers having different refractive indexes, and the the plurality of first layers and the the plurality of second layers are alternately stacked with each other.