Backlight Module With Reflective Through Holes for High Collimation
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Solution Overview
Problem
Existing collimated backlight module technologies face challenges with large divergence angles, low light efficiency, and complex processing, particularly in holographic and light field displays.
Innovation Solution
A backlight module comprising a base substrate with a collimation layer featuring an array of through holes, where the side walls of the holes can reflect light, and light emitting elements are positioned within these holes, enhancing collimation and light efficiency while simplifying the structure and manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If baffle light-shielding technology is used with isolation sleeves, then light direction control is achieved, but collimation degree is extremely low and processing is difficult
Solution Approach 1:
The patent divides the backlight module into multiple light emitting units, each with its own light-shielding structure. This segmentation allows independent control and optimization of each unit's light direction, achieving high collimation degree while simplifying processing compared to a single large isolation sleeve.
Solution Approach 2:
Instead of using complex isolation sleeves that extend beyond the light emitting unit thickness, the patent inverts the approach by integrating light-shielding structures directly within the plane of the light emitting units. This inverted design achieves light direction control without requiring height adjustments beyond the existing thickness, greatly simplifying processing.
2Manufacturing precision
If waveguide grating technology is used for directional light extraction, then collimated light emission is achieved, but light source with single incident direction is required and processing is difficult
Solution Approach 1:
The patent designs light-shielding structures that serve multiple functions: they control light direction for collimation, define the boundaries of light emitting units, and can be integrated with the base substrate. This multi-functionality eliminates the need for separate single-direction light sources and simplifies the overall device configuration.
Solution Approach 2:
The patent uses arrayed light emitting units with identical or similar light-shielding structures, where each unit is a copy of the basic design. This copying approach simplifies processing by allowing standardized manufacturing of multiple units, avoiding the complexity of custom single-direction light sources required by waveguide grating technology.
3Manufacturing precision
If microlens array collimating backlight structure is used, then collimated light is emitted, but light efficiency is extremely low due to openings required to limit divergence angle
Solution Approach 1:
The patent extracts the light direction control function from separate optical elements (like microlenses requiring openings) and integrates it directly into the light-shielding structures of the light emitting units. This extraction eliminates the need for openings that waste light, as the shielding structures control direction without blocking useful light paths.
Solution Approach 2:
The patent merges the light direction control function with the light-shielding structures, combining what were previously separate elements (microlenses and opening-based divergence control) into an integrated solution. This merging eliminates the light efficiency loss associated with required openings while maintaining collimation capability.
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 improves light efficiency and collimation degree while simplifying the structure and processing complexity of the backlight module, making it more suitable for advanced display technologies like holographic and light field displays.
Implementation Method 1
a side wall of each of the plurality of the through holes can reflect light
Data Source
AI summary
The present disclosure relates to the field of display technology, and provides a backlight module, a manufacturing method thereof, and a display device. The backlight module includes a base substrate, a collimation layer, and a plurality of light emitting elements. The collimation layer is disposed on one side of the base substrate, and a plurality of through holes distributed in an array are disposed on the collimation layer, and a side wall of each of the through holes can reflect light. The plurality of light emitting elements are disposed on the base substrate and located within the through holes. The backlight module provided by the present disclosure can improve the light efficiency of the backlight module in the premise of ensuring the collimation degree, at the same time, the backlight module has a simple structure and is easy to be processed.