Mini LED Backlight Diffusion Plate Blocking Walls
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Solution Overview
Problem
Mini LED backlights experience reduced display contrast due to light diffusion from emitting regions to non-emitting regions, affecting the display effect.
Innovation Solution
A backlight module with a diffusion plate featuring blocking walls and a planar portion, where the blocking walls are arranged between light-emitting elements to prevent light from spreading to non-emitting regions, and a light-shielding layer is used to enhance the blocking effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming technology is used with multiple light-emitting elements on the light board, then energy efficiency and display quality are improved, but light diffusion from light-emitting regions to non-light-emitting regions causes light interference and reduces display contrast
Solution Approach 1:
The diffusion plate is segmented into multiple independent light-shielding units, each corresponding to a light-emitting element. Each unit includes a light-shielding wall that divides the space between adjacent light-emitting elements, preventing light diffusion from one element's region to another's region, thus eliminating light interference while maintaining local dimming energy efficiency
Solution Approach 2:
The light-shielding structures are locally positioned only where needed - specifically at the gaps between adjacent light-emitting elements - rather than uniformly across the entire diffusion plate. This localized approach blocks light interference at critical points while minimizing impact on overall light transmission and display quality
2Object-affected harmful factors
If light-shielding structures are added to the diffusion plate, then light interference is reduced and display contrast is improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The light-shielding units are integrated directly into the diffusion plate as a unified structure, combining the light-diffusing function and light-shielding function into a single component. This eliminates the need for separate light-shielding layers or additional assembly steps, reducing structural complexity despite adding light-shielding functionality
Solution Approach 2:
The diffusion plate simultaneously performs multiple functions: it diffuses light uniformly across the display area and provides light-shielding barriers between adjacent light-emitting elements. This multi-functionality eliminates the need for separate dedicated light-shielding components, simplifying the overall structure
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 improves the display contrast and overall display effect by blocking light diffusion between emitting and non-emitting regions, enhancing the structural stability and longevity of the diffusion plate.
Implementation Method 1
The lower part of the blocking wall adjacent to the light board is opaque
Implementation Method 2
a diffusion plate, and the diffusion plate is arranged on the side of the light emitting surface of the light board
Data Source
AI summary
A backlight module and a display device are disclosed. The backlight module includes a light board, and multiple light-emitting elements arranged at intervals on the light board. The backlight module further includes a diffusion plate arranged corresponding to the position of the light board and on the side of a light emitting surface of the light board. The diffusion plate includes: multiple blocking walls arranged at intervals on the side of the planar portion adjacent to the light board; and a planar portion arranged parallel to the light board. The blocking walls are perpendicular to the planar portion, and each blocking wall is arranged corresponding to the gap between two adjacent light-emitting elements. The height of the blocking wall is equal to the distance between the diffusion plate and the light board, and the lower part of the blocking wall adjacent to the light board is opaque.