Micro-LED Driving Substrate Reflectivity Optimization
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Solution Overview
Problem
The existing micro-LED array light-emitting backlight modules face a loss of reflectivity due to the edge forbidden area around the electrode welding pads, leading to reduced light efficiency, as traditional high-reflective layers like white oil have limited reflectivity and occupy significant areas, hindering the achievement of full-screen displays with extremely narrow borders.
Innovation Solution
A driving substrate with a multi-layer structure, including a first and second metal layer forming metal wire patterns, an insulation supporting layer, and high-reflection layers made of organic or inorganic materials, where the electrode welding pad is exposed to enhance reflectivity, and a manufacturing method involving etching and layer formation to optimize reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a traditional high-reflective layer like white oil is used, then the reflectivity is maintained at about 90%, but the occupied area is large and light efficiency is lost due to the edge forbidden area around electrode welding pads
Solution Approach 1:
The high-reflective layer is segmented into multiple separate reflection regions rather than a continuous layer. Each reflection region is positioned away from electrode welding pads, creating distinct reflective zones that avoid the edge forbidden areas. This segmentation allows the high-reflective layer to be applied only where effective, reducing occupied area while maintaining light efficiency.
Solution Approach 2:
Different regions of the driving substrate are assigned different properties: areas near electrode welding pads are excluded from high-reflective layer application (edge forbidden areas), while other regions have high-reflective properties. This local differentiation optimizes light reflection efficiency by applying the high-reflective layer only where it can effectively reflect light without interfering with electrical components.
2Area of stationary object
If the lower boundary of the liquid crystal display device cell is compressed to meet full-screen requirements, then the border is narrowed, but the backlight efficiency decreases due to the need for mixing distance
Solution Approach 1:
The solution moves the high-reflective layer from a two-dimensional continuous coverage to a multi-layer three-dimensional structure with separate reflection regions. This dimensional change allows the reflective layers to be positioned at different heights and locations, enabling effective light reflection without requiring extensive horizontal mixing distance, thus supporting compressed display boundaries while maintaining backlight efficiency.
3Area of stationary object
If mini-LEDs are arranged at smaller pitch to reduce light mixing distance, then the frame is narrowed, but the spacing between adjacent LEDs becomes too small for effective reflection
Solution Approach 1:
The high-reflective layer is divided into separate reflection regions that are spatially separated from each other and from electrode welding pads. This segmentation creates sufficient spacing between reflective elements, allowing mini-LEDs to be arranged at small pitches while maintaining effective light reflection. The separated reflection regions prevent interference between adjacent LEDs and enable the narrow frame design.
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 effectively addresses the loss of reflectivity issue by enhancing light reflection efficiency, allowing for the creation of micro-LED array light-emitting backlight modules with improved brightness and the potential for full-screen displays with narrow borders.
Implementation Method 1
a first high-reflection layer, and a second high-reflection layer... the incident light of the micro-LED 20 re-enters the interior of the backlight after being reflected by the brightness enhancement film 50
Data Source
AI summary
The present disclosure relates to a driving substrate, a manufacturing method, and a micro-LED array substrate light-emitting backlight module. The driving substrate includes a first metal layer, a first high-reflection layer, and a second metal layer stacked in a top-down sequence. The driving substrate, the manufacturing method, and the micro-LED array light emitting backlight module of the present disclosure solve the loss of reflectivity issue caused by the edge forbidden area of the electrode welding pad edge forbidden region. At the same time, the limited reflectivity of traditional coated high-reflective layers (such as white oil) may also be enhanced.