Curved Backlight Module Non-Uniform LED Arrangement
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Solution Overview
Problem
Curved liquid crystal displays experience uneven light emission, leading to a decline in display effect due to the existing backlight modules' inability to maintain uniform light-emitting brightness.
Innovation Solution
A curved backlight module is designed with an optical film and a lamp board, where lamp bars have lamp beads arranged in specific distances and configurations to achieve a uniform light-emitting brightness of at least 75%, utilizing secondary lenses and local dimming partitions to control light distribution and alleviate light leakage at corners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional backlight module with uniformly distributed LED chips is used, then the structure is simple and easy to manufacture, but the light emission becomes uneven on curved displays, leading to poor display effect
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of light-emitting elements in different regions of the backlight module. Specifically, the number of light-emitting elements per row varies across different rows, with edge regions having fewer elements and center regions having more elements. This non-uniform local arrangement compensates for the uneven light distribution characteristics of curved displays, improving overall light emission uniformity while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the parameter of light-emitting element distribution from uniform to non-uniform. By adjusting the number of light-emitting elements in different rows and controlling the optical cavity height within a specific range (0.35-1.5 times the distance between adjacent elements), the system achieves improved light uniformity (75% or higher) on curved displays while keeping the structure relatively simple
2Illumination intensity
If the optical cavity height is increased to improve light uniformity, then the light emission becomes more even, but the module thickness increases and corner light leakage worsens
Solution Approach 1:
The patent optimizes the optical cavity height parameter to a specific range (0.35-1.5 times the distance between adjacent light-emitting elements) to achieve the best balance between light uniformity and corner light leakage control. This parameter optimization allows the system to attain 75% or higher light uniformity while minimizing corner light leakage, avoiding the need for excessive cavity height that would worsen light leakage
Solution Approach 2:
The patent addresses corner light leakage by implementing local quality improvements through differentiated light-emitting element arrangements. By having fewer light-emitting elements in edge rows compared to center rows, the system locally reduces light output at corners where leakage is most problematic, while maintaining sufficient brightness in the display area
3Illumination intensity
If light-emitting elements are densely arranged to increase brightness, then the overall luminance improves, but the manufacturing precision requirements increase and cost rises
Solution Approach 1:
The patent segments the backlight module into multiple rows with different numbers of light-emitting elements. This segmentation allows for optimized brightness distribution across the display area without requiring uniformly high density throughout. The segmented approach achieves sufficient overall brightness while reducing the precision requirements compared to a fully dense arrangement
Solution Approach 2:
The patent changes the density parameter of light-emitting elements from uniform high density to variable density across rows. By controlling the number of elements per row and optimizing their distribution, the system achieves the required overall brightness level while maintaining relaxed manufacturing precision requirements and lower costs
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 ensures a uniform light-emitting brightness of at least 75% across the curved display, improving the display effect by minimizing brightness differences and reducing light leakage at corners, particularly effective for large-size vehicle-mounted displays.
Implementation Method 1
the lamp board has a plurality of lamp bars which extend in a first direction and are arranged in a second direction, a plurality of lamp beads distributed in an array are provided on each of the lamp bars
Implementation Method 2
when the lamp beads are provided with secondary lenses, the ratio of the optical cavity height to the first distance is greater than or equal to 0.35 and less than or equal to 1
Data Source
AI summary
Disclosed are a curved backlight module and a display device. The curved backlight module includes: an optical film and a lamp board which are oppositely provided, the distance between the optical film and the lamp board being referred to as an optical cavity height; the lamp board is provided with a plurality of lamp bars which extend in a first direction and are arranged in a second direction, a plurality of lamp beads distributed in an array are provided on each of the lamp bars, and the distribution parameters of the lamp beads on each of the lamp bars are the same; and on each of the lamp bars, there is a first distance between two adjacent lamp beads in the first direction, and there is a second distance between two adjacent lamp beads in the second direction.