Distributed LED Tile Matrix Backlight for Large Displays
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Solution Overview
Problem
Large-sized personal data displays, such as computer monitors, face challenges in replacing cold cathode fluorescent light (CCFL) sources with LEDs due to requirements for uniform brightness, color consistency, thermal management, and cost-effectiveness, as current LED technologies are not well-suited for large arrays, leading to bulkiness, high manufacturing costs, and color non-uniformities.
Innovation Solution
A display system utilizing a distributed LED backlight with a thermally and mechanically integrated tile matrix configuration, where each tile contains multiple LEDs on a metallic substrate, providing excellent thermal conductivity and structural support, allowing for efficient assembly and uniform illumination across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED light sources are distributed around the periphery of large displays, then the display can be illuminated, but uniform brightness cannot be achieved due to light attenuation over distance
Solution Approach 1:
The backlight system is segmented into multiple discrete LED light sources distributed in a matrix pattern across the display area, rather than using a single peripheral arrangement. This segmentation allows each LED to illuminate a localized region, reducing the effect of distance-related attenuation and enabling more uniform brightness distribution across large display surfaces.
Solution Approach 2:
The LED arrangement transitions from a one-dimensional peripheral distribution to a two-dimensional matrix distribution across the display area. This dimensional change increases the spatial density of light sources, ensuring that no region is too far from an LED, thereby achieving uniform illumination across large displays.
2Illumination intensity
If a large array of LED light sources is used to illuminate large displays, then sufficient brightness can be achieved, but the system becomes bulky and mechanically complex
Solution Approach 1:
Multiple LED light sources are merged onto single substrate boards, creating integrated LED modules. This consolidation reduces the number of discrete components and simplifies the mechanical structure, making the system more suitable for large display applications without requiring bulky individual mounting structures for each LED.
Solution Approach 2:
The substrate boards serve multiple functions: they provide electrical connection for multiple LEDs, mechanical support for the LED array, and a platform for integrated mounting. This multi-functionality reduces the need for separate structural components, thereby reducing overall system complexity.
3Illumination intensity
If CCFL light sources are used in large displays, then uniform illumination can be achieved, but environmentally unfriendly mercury is required
Solution Approach 1:
The invention replaces long-lived but hazardous CCFL tubes with shorter-lived but environmentally benign LED light sources. LEDs contain no mercury and are environmentally friendly, and while their operational lifetime is shorter than CCFLs, they still provide sufficient service life for display applications while eliminating toxic material concerns.
4Illumination intensity
If LED technology is applied to small displays, then excellent color gamma and energy efficiency are achieved, but the technology is not yet suitable for large displays
Solution Approach 1:
The backlight system is segmented into multiple discrete LED light sources distributed in a matrix pattern across the display area, rather than using a single peripheral arrangement. This segmentation allows each LED to illuminate a localized region, reducing the effect of distance-related attenuation and enabling more uniform brightness distribution across large display surfaces.
Solution Approach 2:
Multiple LED light sources are merged onto single substrate boards, creating integrated LED modules. This consolidation reduces the number of discrete components and simplifies the mechanical structure, making the system more suitable for large display applications without requiring bulky individual mounting structures for each LED.
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 enables the production of commercially viable, thin, lightweight, and cost-effective large-size displays with improved thermal uniformity and structural integrity, maintaining high-quality color consistency and user experience while being compatible with existing CCFL-based configurations.
Implementation Method 1
each tile contains multiple LEDs on a metallic substrate, providing excellent thermal conductivity and structural support
Data Source
AI summary
A display system with a distributed LED backlight includes: providing a plurality of tile LED light sources, each tile LED light source having a tile and a plurality of similar LED light sources on each tile connected for emitting light therefrom; orienting the plurality of tile LED light sources for illuminating a display from the back of the display; and integrating the plurality of tile LED light sources into a thermally and mechanically structurally integrated distributed LED tile matrix backlight light source.