Direct-Lit Backlight Module with Alternating Viewing Angle LEDs
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Solution Overview
Problem
Direct-lit backlight modules with larger viewing angle light emitting units result in thicker modules, causing halo effects, poor contrast, and uniformity issues in display devices, affecting consumer experience.
Innovation Solution
A direct-lit backlight module design incorporating first and second light emitting units with different viewing angles, where the first units have a larger viewing angle than the second units, arranged alternately, and a control unit to selectively drive them, along with an optical layer and substrate forming an accommodating space, allowing for flexible illumination modes and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting units with larger viewing angles are used, then the illumination coverage is improved, but the backlight module thickness increases
Solution Approach 1:
The backlight module divides light emitting units into two distinct groups: first light emitting units with larger viewing angles for wide area illumination, and second light emitting units with smaller viewing angles for localized lighting. This segmentation allows each type to perform its specialized function, achieving comprehensive coverage without requiring all units to have large viewing angles, thereby controlling overall thickness.
Solution Approach 2:
Different regions of the backlight module use different types of light emitting units tailored to local requirements. Areas requiring broad illumination use first light emitting units with larger viewing angles, while areas needing focused lighting use second light emitting units with smaller viewing angles. This local optimization ensures that thickness is minimized where possible while maintaining illumination coverage where needed.
2Illumination intensity
If light emitting units with larger viewing angles are used, then the illumination coverage is improved, but the contrast and uniformity deteriorate
Solution Approach 1:
The backlight module segments light emitting units into two categories with different viewing angle characteristics. First light emitting units with larger viewing angles provide broad illumination coverage, while second light emitting units with smaller viewing angles provide focused, precise lighting. This segmentation allows the system to achieve both wide coverage and high uniformity by combining the strengths of both types.
Solution Approach 2:
Different types of light emitting units are deployed in different locations based on local display requirements. First light emitting units are positioned where broad coverage is needed, while second light emitting units are positioned where precise, uniform illumination is required. This local quality approach ensures that each region receives the appropriate type of lighting for optimal display uniformity.
3Illumination intensity
If more light emitting units are used to improve illumination coverage, then the coverage is improved, but the power consumption increases
Solution Approach 1:
The backlight module segments light emitting units into two efficient categories: first light emitting units with larger viewing angles that illuminate larger areas per unit, and second light emitting units with smaller viewing angles that provide focused lighting. This segmentation reduces the total number of units needed compared to using only small-viewing-angle units, thereby reducing overall power consumption while maintaining comprehensive coverage.
Solution Approach 2:
The control unit selectively activates only the necessary light emitting units based on display content requirements. Rather than continuously powering all units, the system uses partial action by activating only first light emitting units when wide coverage is needed, or only second light emitting units when focused lighting is sufficient, thereby reducing average power consumption.
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 improves contrast and uniformity, reduces the halo effect, and minimizes module thickness by optimizing the number and arrangement of light emitting units, achieving a balance between display quality, power consumption, and cost.
Implementation Method 1
The first light emitting units are in the accommodating space. The first light emitting units emit light towards the optical layer
Data Source
AI summary
A direct-lit backlight module includes a substrate, an optical layer that forms an accommodating space with the substrate, first light emitting units in the accommodating space, second light emitting units in the accommodating space and a control unit electrically connected to the first light emitting units and the second light emitting units. The first light emitting units emit light towards the optical layer and have a first viewing angle. The second light emitting units emit light towards the optical layer and have a second viewing angle. The control unit provides a control signal to selectively drive the first light emitting units and the second light emitting units. The first light emitting units are adjacent to the second light emitting units. The first light emitting units and the second light emitting units are arranged alternately. The first viewing angle is larger than the second viewing angle.