Reflective Pixel Structure for Side-Emitted Light Recovery
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Solution Overview
Problem
Current display devices face challenges in enhancing light output efficiency of light emitting elements, particularly in reflecting light emitted to the side surfaces effectively.
Innovation Solution
The display device incorporates a first reflective layer surrounding the light emitting elements, which reflects light emitted to the side surfaces upward, improving light output efficiency by optimizing the structure with a first capping layer and a first via layer configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reflective layer is added to surround light emitting elements, then light output efficiency is improved, but device complexity increases
Solution Approach 1:
The reflective layer is configured to surround the side surfaces of light emitting elements, utilizing the vertical dimension to redirect light that would otherwise be lost laterally. This dimensional approach captures side-emitted light and redirects it upward, improving overall light output efficiency without requiring expansion in the horizontal plane.
Solution Approach 2:
The reflective layer converts the harmful effect of light loss to side surfaces into a beneficial effect by reflecting this light back upward toward the emission area. Instead of allowing light to be wasted in unwanted directions, the reflective layer recovers this light and redirects it to contribute to the displayed image, thereby improving light output efficiency.
2Productivity
If the reflective layer is positioned close to light emitting elements, then light reflection efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The reflective layer is nested within the bank layer structure, which provides a predefined geometric framework. This nesting approach allows the reflective layer to be positioned close to light emitting elements for efficient light reflection while utilizing the bank layer's structural precision to maintain consistent spacing and positioning, thereby reducing the direct manufacturing precision requirements for the reflective layer itself.
Solution Approach 2:
The bank layer acts as an intermediary structure between the light emitting elements and the reflective layer. By providing a standardized geometric framework, the bank layer mediates the positioning relationship, ensuring optimal proximity for light reflection while simplifying the manufacturing process through a pre-established structural reference that reduces direct positioning precision demands on the reflective layer.
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 light output efficiency of the light emitting elements by effectively reflecting light emitted to the side surfaces, thereby improving the overall display performance.
Implementation Method 1
a first reflective layer disposed on the first via layer and surrounding side surfaces of the light emitting elements
Data Source
AI summary
A display device includes a pixel electrode disposed on a substrate, a bank layer disposed on the substrate and the pixel electrode, and separating an emission area from a non-emission area, light emitting elements each arranged on the pixel electrode and including a first semiconductor layer, a second semiconductor layer, and an active layer disposed between the first semiconductor layer and the second semiconductor layer, a first capping layer disposed on the pixel electrode and surrounding side surfaces of the light emitting elements, a first reflective layer disposed on the first capping layer and surrounding the side surfaces of the light emitting elements, a first via layer disposed on the first reflective layer, a second via layer disposed on the first via layer, and a common electrode disposed on the second via layer and the light emitting elements.