Light Guide Plate Reflective Protrusions Heat Management
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Solution Overview
Problem
In field sequential control mode of TFT LCDs, achieving uniform light emission while minimizing heat emission from backlight units is challenging due to the arrangement and positioning of LEDs of different colors, which affects color blending and efficiency.
Innovation Solution
A light guiding plate with reflective protrusions on its surface, where the reflectivity of the protrusions increases with distance from the light source, ensuring uniform light emission and distributing light sources around the periphery to reduce heat accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple groups of LEDs with different colors are arranged to emit light in turns for field sequential control, then color blending and operational efficiency are improved, but heat emission from the backlight unit increases
Solution Approach 1:
The backlight unit is segmented into multiple independent LED groups arranged around the periphery of the light guiding plate, with each group containing LEDs of different colors. This segmentation allows time-division multiplexing of different color emissions while distributing heat sources spatially, preventing heat accumulation at any single location.
Solution Approach 2:
The LED groups are arranged in a circular perimeter configuration around the light guiding plate rather than concentrating them at a single location. This spatial redistribution in two dimensions allows the system to maintain high operational efficiency through field sequential control while significantly reducing localized heat emission and improving thermal management.
2Device complexity
If light sources are concentrated at a single location to simplify the backlight structure, then device complexity is reduced, but uniformity of light emission deteriorates
Solution Approach 1:
The backlight structure is segmented into multiple LED groups positioned around the periphery of the light guiding plate. Each group contains LEDs of different colors that emit light in turns. This segmentation maintains relatively simple individual group structures while achieving uniform overall light emission through coordinated operation of multiple segments.
Solution Approach 2:
Different regions of the light guiding plate are served by different LED groups positioned at specific locations around the periphery. Each local region receives light from appropriately positioned LED groups, ensuring uniform illumination across the entire display area while maintaining manageable structural complexity at each local level.
3Productivity
If the arrangement and positions of LEDs for each color are optimized for color blending, then operational efficiency is improved, but heat emission from specific locations increases
Solution Approach 1:
The LED arrangement is segmented into multiple color groups distributed around the periphery of the light guiding plate. Each group contains LEDs of specific colors positioned to optimize color blending when emitted in turns. This segmentation allows efficient color blending through field sequential control while distributing heat-generating LED groups across different locations, preventing concentrated heat emission.
Solution Approach 2:
The LED groups are arranged in a circular perimeter configuration rather than concentrating optimal color-blending LED positions at a single location. This two-dimensional spatial distribution maintains the optical optimization for color blending while simultaneously distributing thermal load across the perimeter, reducing localized heat emission harmful effects.
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 achieves uniform light emission and low heat emission by varying reflectivity across the light guiding plate, enhancing color blending and operational efficiency in field sequential control mode.
Implementation Method 1
a light guiding plate with reflective protrusions on its surface, where the reflectivity of the protrusions increases with distance from the light source
Data Source
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AI summary
A method of manufacturing a light guiding plate comprises steps of: forming a protrusion array composed of a plurality of protrusions (300) on a surface of a substrate (100); and forming reflective layers (301) on side facets of the protrusions (300) respectively, in such a way that, the farther away from a side of the substrate (100) the protrusion (300) with the reflective layer is, the greater the reflectivity of the reflective layer (301) is. The light emitted from the light guiding plate made by the method is relatively uniform, and the heating issue is also avoided.