Metasurface Reflective Layer for Display Substrate Light Collimation
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Solution Overview
Problem
Current reflective display panels have a low utilization rate of ambient light, resulting in low brightness and nonuniform display due to their inability to effectively collimate and emit light incident at oblique angles, leading to insufficient light distribution and poor display performance.
Innovation Solution
A display substrate with a reflective layer featuring a metasurface comprising scattered convex structures with metamaterial properties, which increases the collimation of reflected light by controlling the reflection angle and improving light utilization, enhancing the brightness and uniformity of the displayed image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflective layer is used, then the structure is simple, but the utilization rate of ambient light is low and brightness is insufficient
Solution Approach 1:
The reflective layer is segmented into multiple convex structures with different shapes and sizes arranged in an array pattern. Each convex structure acts as an independent light scattering element, collectively achieving superior light collimation and ambient light utilization compared to a flat reflective surface.
Solution Approach 2:
The patent employs convex structures with curved surfaces (spherical caps or similar shapes) instead of flat surfaces. These curved surfaces effectively collimate incident light at oblique angles by controlling the reflection angle, directing reflected light perpendicular to the plane of the reflective layer, thereby significantly improving brightness and light distribution uniformity.
2Manufacturing precision
If a flat reflective layer is used, then the manufacturing process is simple, but light distribution is nonuniform and display effect is poor
Solution Approach 1:
The patent changes the geometric parameters of the reflective layer by introducing convex structures with specific dimensions (width and height within defined ranges) and spatial arrangements (spacing between structures). These parameter changes enable precise control over light reflection characteristics, achieving uniform light distribution while maintaining manufacturability through standardized fabrication processes.
3Illumination intensity
If ambient light is used directly without collimation, then the power consumption is low, but the utilization rate of ambient light is low and displayed image brightness is insufficient
Solution Approach 1:
The convex structures with curved surfaces collimate ambient light incident at oblique angles by controlling the reflection angle, directing reflected light perpendicular to the plane of the reflective layer. This significantly improves the utilization efficiency of ambient light, extracting more usable light from the same ambient source without additional power consumption.
Solution Approach 2:
The segmented array of convex structures provides multiple reflection paths for incident ambient light, increasing the probability of light being redirected toward the display area. This segmentation strategy maximizes ambient light capture and utilization, improving displayed image brightness while maintaining low power consumption characteristics of reflective displays.
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 metasurface design significantly increases the collimation of reflected light, improving the utilization rate of ambient light and resulting in brighter and more uniformly displayed images by directing reflected light perpendicular to the plane of the reflective layer.
Implementation Method 1
the reflective layer comprises a metasurface facing a display side of the display substrate, and the metasurface comprises a plurality of convex structures which have metamaterial properties and are scattered
Data Source
AI summary
A display substrate and a manufacturing method thereof and a display panel. The display substrate includes a display area and a reflective layer, and at least a portion of the reflective layer is in the display area. The reflective layer includes a metasurface facing a display side of the display substrate, and the metasurface includes a plurality of convex structures which have metamaterial properties and are scattered.