Off-Axis Micro-Lens Arrays for Narrower Display Viewing Angles
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Solution Overview
Problem
Conventional display technologies suffer from large viewing angles that waste light, increase power consumption, and compromise user privacy, particularly in portable devices, and they also suffer from light crosstalk and loss of sharpness due to non-directional light emission from LEDs.
Innovation Solution
Integration of an off-axis micro-lens array in display panels to control light direction, reduce divergence, and focus light on a single point, using fabrication methods like self-assembly and high-temperature reflow to align micro-lenses with pixel light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional display technologies use large viewing angles to accommodate multiple audiences, then more users can see the screen, but light is wasted and power consumption increases
Solution Approach 1:
The patent applies local quality by implementing micro-lenses at specific pixel locations (e.g., corner pixels) rather than uniformly across the entire display. Each micro-lens is positioned to control light emission in specific directions, creating localized directional control where needed while maintaining conventional emission patterns elsewhere. This resolves the contradiction by directing light efficiently in high-viewing-angle regions without sacrificing overall viewing angle adaptability.
Solution Approach 2:
The display panel is segmented into different functional regions: pixels with micro-lenses for directional light control and pixels without micro-lenses for conventional omnidirectional emission. This segmentation allows the system to simultaneously achieve energy efficiency in specific areas while maintaining overall viewing flexibility, resolving the contradiction between viewing angle and light waste.
2Adaptability or versatility
If conventional display technologies use large viewing angles, then multiple audiences can view the screen, but user privacy is compromised
Solution Approach 1:
Micro-lenses are selectively positioned at specific pixel locations to create directional light emission zones. These localized directional control regions limit light propagation to specific viewing angles, preventing unintended observers from viewing the display content while maintaining adequate viewing angle for legitimate users. This resolves the privacy contradiction without sacrificing overall display adaptability.
3Illumination intensity
If LEDs emit light in all directions, then light coverage is maximized, but light crosstalk occurs and sharpness is lost
Solution Approach 1:
Micro-lenses are integrated at specific pixel locations to provide localized directional control of light emission. Each micro-lens focuses light from its corresponding LED in a specific direction, preventing light from spreading into adjacent pixel regions. This localized control eliminates light crosstalk and maintains image sharpness while preserving adequate light coverage through strategic positioning of micro-lenses at pixels that would otherwise cause crosstalk issues.
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 reduces power waste, increases brightness, and enhances user privacy by limiting the viewing angle to a usable range, improving sharpness and contrast in LED displays.
Implementation Method 1
an array of micro-lenses aligned to the pixel light sources and positioned to reduce the divergence of light produced by the pixel light sources
Implementation Method 2
using fabrication methods like self-assembly and high-temperature reflow to align micro-lenses with pixel light sources
Data Source
AI summary
A light emitting structure array system includes a semiconductor substrate and a first light emitting mesa on the semiconductor substrate. The first light emitting mesa includes a metal layer formed on the semiconductor substrate, a light emitting layer formed on the metal layer, and a first insulation layer covering at least a side wall of the light emitting layer and at least a portion of the metal layer. The first insulation layer has an opening that exposes a portion of the light emitting layer. The first light emitting mesa further includes a top electrode layer formed over the first insulation layer and in electrical contact with the light emitting layer via the opening. The light emitting structure array system further includes a reflective cup that surrounds the first light emitting mesa and is in physical contact with the top electrode layer.