Folded Substrate Backlight for LCD Uniform Illumination
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Solution Overview
Problem
Conventional direct type backlights for liquid crystal display devices require large substrates for light emitting diodes, leading to increased component count and cost, as light emitting diodes are arranged across the entire surface of the liquid crystal display panel.
Innovation Solution
A backlight design where light emitting diodes are mounted on a substrate with a reflection sheet that overlaps the substrate without covering the diodes, and the substrate is shaped to be narrower than the liquid crystal display panel, with a central portion opposed to the panel's central area, allowing for a smaller substrate size and reduced cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting diodes are arranged across the entire surface of the liquid crystal display panel, then uniform light distribution is achieved, but substrate size and cost increase
Solution Approach 1:
The patent transitions from a two-dimensional planar substrate to a three-dimensional folded substrate configuration. The substrate is folded along a reference line to create a non-planar structure that can achieve uniform light distribution across the display panel while maintaining a compact overall size. This dimensional transformation allows the substrate to cover the necessary area without requiring a large flat surface.
Solution Approach 2:
The folded substrate structure allows portions of the substrate to be nested or overlapped in three-dimensional space. By folding the substrate along a reference line, the design creates a compact configuration where substrate areas are efficiently utilized, reducing the overall substrate size while maintaining the required light distribution area.
2Illumination intensity
If a large substrate is used to cover the entire liquid crystal display panel, then complete light coverage is achieved, but component count and manufacturing cost increase
Solution Approach 1:
By folding the substrate into a three-dimensional configuration, the patent achieves complete light coverage of the display panel using a smaller amount of substrate material. The folded structure allows the substrate to extend and cover the entire panel area through spatial transformation rather than requiring a large flat substrate, thereby reducing material costs and manufacturing complexity.
Solution Approach 2:
The substrate is divided into multiple sections by introducing folds along reference lines. This segmentation allows each section to be optimally positioned to cover specific areas of the display panel, achieving complete coverage while using less total substrate material. The segmented folded structure also simplifies manufacturing compared to a single large substrate.
3Area of stationary object
If the substrate width in the second direction is reduced, then substrate size and cost are reduced, but light distribution to end portions may be insufficient
Solution Approach 1:
The patent compensates for the reduced substrate width by utilizing the third dimension through folding. The folded structure allows the substrate to extend its effective coverage area vertically and diagonally, ensuring that light is distributed to the end portions of the display panel even though the substrate's width in the second direction is reduced. This three-dimensional configuration maintains adequate light distribution while using less substrate material.
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 design reduces the size and cost of the substrate while maintaining effective light distribution across the liquid crystal display panel, achieving comfortable brightness distribution and reducing the number of light emitting diodes required.
Implementation Method 1
a reflection sheet, which overlaps the substrate at a surface on which the plurality of light emitting diodes are mounted
Implementation Method 2
a plurality of light emitting diodes; a substrate on which the plurality of light emitting diodes are mounted
Data Source
AI summary
A backlight includes light emitting diodes; a substrate on which light emitting diodes are mounted; and a reflection sheet. The surface on which the light emitting diodes are mounted of the substrate is opposed to a rear surface of the liquid crystal display panel. The liquid crystal display panel and the substrate each have a shape in which a common width in a first direction is longer than a width in a second direction, which is orthogonal to the first direction. The width of the substrate in the second direction is shorter than the width of the liquid crystal display panel in the second direction. The substrate is opposed to, while avoiding being opposed to both end portions of the liquid crystal display panel in the second direction, a central portion between the both end portions of the liquid crystal display panel.