Multi-Layer Bank Structure for Side Light Reflection in Display Modules
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Solution Overview
Problem
Current display modules face challenges in maximizing light efficiency and contrast ratio due to optical interference between adjacent pixels, particularly in high-definition mobile displays, where the existing light emitting elements and color conversion layers do not effectively utilize side light for improved image quality.
Innovation Solution
A display module design featuring a substrate with light emitting elements, a bank portion structured in multiple layers to space and reflect side light, and color conversion layers filled within cells defined by the bank portion, along with an encapsulation layer and a driving circuit to enhance light emission and reduce optical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional single-layer bank structure is used to space light emitting elements, then the structure is simple and easy to manufacture, but light efficiency is reduced due to loss of side light and optical interference between adjacent pixels
Solution Approach 1:
The bank structure is divided into multiple layers (first bank layer, second bank layer, third bank layer) with each layer serving specific functions. The first bank layer spaces adjacent light emitting elements, the second bank layer reflects side light, and the third bank layer provides additional spacing and structural support. This segmentation allows efficient utilization of side light while maintaining clear functional separation between layers.
Solution Approach 2:
The patent introduces a vertical multi-layer dimension to the traditional horizontal bank structure. By stacking bank layers vertically with different functionalities at different heights, the design captures side light that would otherwise be lost, converting it into useful forward light without increasing horizontal footprint or complicating lateral manufacturing processes.
2Manufacturing precision
If light emitting elements are placed close together to increase pixel density, then display resolution is improved, but optical interference between adjacent pixels increases and light efficiency decreases
Solution Approach 1:
Multiple bank layers are positioned at different horizontal distances from the light emitting elements. The first bank layer is positioned closer to provide primary spacing, while the second and third bank layers are positioned farther away to provide secondary spacing and reflection. This segmented approach creates effective optical isolation between adjacent pixels, reducing crosstalk and interference while maintaining high pixel density.
3Productivity
If side light from light emitting elements is not utilized, then the structure is simpler, but light efficiency and contrast ratio are reduced
Solution Approach 1:
The patent converts the previously harmful or wasted side light into a beneficial resource. The second bank layer is specifically designed with reflective properties to capture side light that would otherwise be lost, and redirect it toward the forward direction. This transforms a waste product into useful light output, improving overall light efficiency and contrast ratio.
Solution Approach 2:
The multi-layer bank structure serves multiple functions simultaneously: the first bank layer provides spacing and isolation, the second bank layer reflects and redirects side light, and the third bank layer provides additional spacing and structural support. This multi-functionality allows a single structural element to address multiple performance requirements without adding separate components.
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
The solution maximizes light efficiency and minimizes optical interference between pixels, leading to improved image quality and contrast ratio in high-definition mobile displays by effectively utilizing side light from light emitting elements.
Implementation Method 1
a second layer laminated or disposed on the first layer, spaced apart from a side surface of the light emitting element, and configured to reflect light emitted from the side surface of the light emitting element
Data Source
AI summary
A display module in which a plurality of pixels are arranged and an electronic device including the display module are disclosed. The display module includes: a display panel including a substrate, a plurality of light emitting elements mounted on the substrate, a bank portion disposed on the substrate to space the plurality of light emitting elements apart from each other, color conversion layers disposed in cells defined by the bank portion to cover the light emitting elements, and an encapsulation layer covering the bank portion and the color conversion layers, and a driving circuit disposed on the substrate and configured to generate a driving signal of the plurality of light emitting elements, the bank portion including a first layer having a thickness less than a height of an active layer of the light emitting element, and a second layer disposed on the first layer, spaced apart from a side surface of the light emitting element, and configured to reflect light emitted from the side surface of the light emitting element.