Backlight Module Corner Illumination Uniformity
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Solution Overview
Problem
Direct-light type backlight modules suffer from shadows at corners due to a lack of light sources, leading to uneven brightness and contrast differences between the center and corner regions.
Innovation Solution
Incorporating second light sources in the dark regions and using reflection structures, such as conical reflection structures, to distribute light more evenly across the backlight module, including arranging light sources on side edges and corners, and utilizing reflection plates to enhance light reflection and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light sources are arranged in array from bottom to top with same distances, then the assembling is simple and cost is low, but shadow occurs on the corner because light sources can't illuminate the corner
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of light sources based on location. The first light sources are arranged in arrays in the luminous region with consistent spacing, while the second light sources are specifically positioned in the dark region at corners and edges. This localized differentiation ensures that each region receives appropriate illumination without compromising the overall simplicity of assembly.
Solution Approach 2:
The patent transitions from a one-dimensional linear arrangement of light sources to a two-dimensional distribution pattern. The second light sources are added at the corners and along the edges, creating a multi-dimensional lighting layout that covers areas previously unreachable by the simple linear array, thereby eliminating corner shadows while maintaining manufacturing simplicity.
2Device complexity
If light sources are arranged in array from bottom to top, then the structure is simple, but contrast difference between brightness of center position and corner position is large
Solution Approach 1:
The patent makes different parts of the backlight module have different light source configurations. The luminous region uses a regular array of first light sources, while the dark region uses second light sources positioned at corners and edges. This local quality approach balances the brightness across different regions without significantly increasing overall structural complexity.
Solution Approach 2:
The patent segments the backlight module into distinct luminous region and dark region, with different light source arrangements for each segment. This segmentation allows optimized illumination for each region while keeping the overall structure manageable and not overly complex.
3Illumination intensity
If second light sources are added in the dark region, then corner illumination is improved, but the quantity of light sources increases
Solution Approach 1:
Instead of uniformly increasing light sources throughout the entire module, the patent applies light sources locally only where needed - specifically at the dark region corners and edges. This targeted approach improves corner illumination without unnecessarily increasing the total quantity of light sources in regions that already have sufficient lighting.
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
Effectively reduces contrast differences in brightness between the center and corner regions, compensating for the shortage of light sources at corners and edges, thereby minimizing shadows and improving overall illumination uniformity.
Implementation Method 1
The first reflection plate, the second reflection plate and the bottom plate form the conical reflection structure at an intersection
Data Source
AI summary
This application discloses a backlight module, including: a back plate, a backlight source installed on the back plate, a luminous region located in the center region of the back plate, and a dark region which is located at the edge of the back plate and surrounds the luminous region. The backlight source includes first light sources and second light sources. The first light sources are located in the luminous region, and the second light sources are located in the dark region.