Mid-frame Spacer Design for Uniform LED Illumination
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Solution Overview
Problem
Conventional peripheral displays face challenges in achieving uniform illumination due to irregular spacing of light emitting diodes relative to the light guide plate, leading to illumination hot spots and increased costs from time-intensive and imprecise adjustments.
Innovation Solution
A mid-frame structure with integrated spacers maintains a consistent spacing between light emitting diodes and the light guide plate, eliminating intervening structures that interfere with light transmission and ensuring uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single mid-frame structure is used to hold the display panel, backlight and system electronics chassis, then device integration is improved, but alignment precision of light emitting diodes relative to the light guide plate deteriorates
Solution Approach 1:
The patent segments the mid-frame structure by integrating separate spacer components that specifically address the alignment of light emitting diodes to the light guide plate. This segmentation allows the spacer to independently control LED positioning while the mid-frame maintains overall device integration, resolving the contradiction between integration and alignment precision.
2Manufacturing precision
If structures are added between individual light emitting diode elements to maintain regular spacing, then spacing uniformity is improved, but light transmission into the light guide plate deteriorates
Solution Approach 1:
The spacer acts as an intermediary component that maintains regular spacing between light emitting diode elements while being transparent to light transmission. By positioning the spacer at the boundary between the LED package and light guide plate rather than between individual LEDs, it preserves spacing uniformity without interfering with light transmission into the light guide plate.
3Illumination intensity
If light guide plate distribution patterns are adjusted to correct uneven illumination, then illumination uniformity is improved, but manufacturing time and cost increase
Solution Approach 1:
The spacer is integrated into the mid-frame structure during manufacturing, establishing uniform LED spacing before the lighting assembly is completed. This preliminary action prevents illumination non-uniformity from occurring in the first place, eliminating the need for time-consuming post-assembly adjustments to the light guide plate distribution patterns.
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 solution provides a thin, uniformly illuminated liquid crystal display panel with reduced corrective measures for non-uniformity, resulting in a cost-effective and high-quality illumination pattern.
Implementation Method 1
The light guide structure is typically a flat plate of material that transmits light, such as glass and plastics like PMMA or MS
Implementation Method 2
integrated spacers that support a light emitting diode package in a spaced relationship proximate a light guide plate
Data Source
AI summary
An information handling system peripheral display provides backlight to a liquid crystal display panel through a light guide plate with illumination from a light emitting diode package having plural evenly spaced light emitting diodes disposed in a spaced relationship along one side of the light guide plate. For insert molded coupling devices, a midframe structure integrates spacers at opposing ends of the bottom side of the light guide plate to maintain the spaced relationship without any additional intervening structures between the light emitting diode package and light guide plate along the bottom side between the opposing ends.