Backlight Module Stacked Light Guide Plates
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Solution Overview
Problem
Conventional backlight modules using a single light guide plate suffer from light leakage and visible differences in luminance and chroma between light areas, due to total internal reflection and cumbersome assembly processes, affecting the overall visual experience.
Innovation Solution
A backlight module design utilizing multiple stacked light guide plates with microstructure layers, including primary and secondary strips with specific aperture ratios, and prisms to break total internal reflection and control light distribution, reducing light leakage and chroma differences between areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light guide plates are assembled together to create separate light areas, then different portions can provide luminance separately, but light leakages occur at the boundaries and visible differences in luminance and chroma appear at the gaps
Solution Approach 1:
The patent merges multiple light guide plates into a single integrated light guide portion structure. The light guide portion includes multiple light guide plates arranged in an array that are optically coupled together, eliminating the gaps and boundaries between separate plates. This integration prevents light leakage at interfaces while maintaining the capability to control different portions independently through selectively driven light sources.
Solution Approach 2:
The patent introduces a microstructure layer as an intermediary component between the light guide plates. This microstructure layer is disposed on the light guide plates and serves as an optical mediator that manages light distribution across the boundaries of adjacent light guide plates, preventing light leakage while maintaining uniform luminance across the entire light guide portion.
2Adaptability or versatility
If multiple light guide plates are assembled together to provide separate luminance control, then different portions can be lit separately, but the assembly process becomes cumbersome and requires great precision
Solution Approach 1:
The patent combines multiple light guide plates into a single integrated light guide portion structure with unified boundaries. This merging eliminates the need for precise assembly of multiple separate plates, as the integrated structure is manufactured as one piece or pre-assembled unit, significantly simplifying the overall assembly process while maintaining separate light area control capabilities.
3Adaptability or versatility
If multiple light guide plates are assembled together to create separate light areas, then different portions can provide luminance separately, but deviation between light guide plates occurs under external forces
Solution Approach 1:
The patent merges multiple light guide plates into a single integrated light guide portion structure. This integration eliminates the relative movement and alignment deviation issues that occur between separate assembled plates under external forces, as the unified structure maintains fixed internal boundaries and optical relationships regardless of external mechanical stress.
4Device complexity
If a single light guide plate is used to guide light, then the structure is simple, but luminance at every portion is substantially the same and cannot provide different luminance at different parts
Solution Approach 1:
The patent segments the light guide portion into multiple light guide plates arranged in an array, where each light guide plate corresponds to a different portion and can be independently controlled by selectively driven light sources. This segmentation enables different luminance distribution at different parts while maintaining a relatively simple overall structure through the modular array configuration.
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 effectively creates separate light areas with reduced luminance and chroma differences, enhancing the visual experience by minimizing light leakage and improving optical efficiency through precise control of light distribution and assembly precision.
Implementation Method 1
the bottom of each light guide plate 30 is disposed with a microstructure layer (not illustrated) to break the total internal reflection of lights travelling within the light guide portion 20
Implementation Method 2
The first upper structure layer includes a plurality of prisms, wherein the extending direction of the prisms is substantially parallel with the travelling direction of lights generated by the first light source set
Data Source
AI summary
This embodiment relates to a backlight module, comprising a first light guide plate and a second light guide plate, wherein a first lower structure layer and a second lower structure layer are disposed on the first light guide plate and the second light guide plate, respectively. The first lower structure layer includes a first primary strip and a first secondary strip, wherein the first primary strip is located between the first secondary strip and one side of the first light guide plate. The second lower structure layer includes a second primary strip and a second secondary strip, wherein the second primary strip is located between the second secondary strip and one side of the second light guide plate. The second primary strip is exposed outside the projection of the first lower structure layer on the second lower structure layer and the first lower structure layer at least partially overlaps the second secondary strip.