Mini-LED Backlight Module Shadow Optimization
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Solution Overview
Problem
Mini-LED backlight modules face challenges with poor LED light shadow blocking, leading to increased costs, reduced transmittance, and poor shockproof performance, especially in narrow-bezel products.
Innovation Solution
A backlight module design featuring quantum dot films with diffusion blocks, where each LED light-emitting chip corresponds to a diffusion block, optimizing light diffusion without increasing module thickness, using particles larger than 15 micrometers and haze greater than 80%, and optionally incorporating a diffuser film to enhance light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a quantity of LEDs is increased to improve LED light shadow blocking, then light shadow blocking is improved, but costs are increased
Solution Approach 1:
The patent introduces diffusion blocks as intermediary elements between the LED chips and the display panel. These diffusion blocks scatter LED light to fill shadow regions, effectively reducing light shadow blocking without requiring additional LED chips, thus avoiding increased costs
Solution Approach 2:
The patent changes the optical parameters by introducing diffusion blocks with specific haze values (greater than 80%) and particle sizes (greater than 15 micrometers). This parameter change enables effective light diffusion to eliminate shadows without increasing LED quantity or cost
2Object-affected harmful factors
If a diffusion plate of a high haze is used to block LED light shadow, then LED light shadow blocking is improved, but transmittance is reduced
Solution Approach 1:
The patent segments the diffusion function into discrete diffusion blocks positioned at specific locations corresponding to LED chips, rather than using a single large diffusion plate. This segmentation allows localized light diffusion exactly where needed (in shadow regions) while leaving other areas transparent, thus blocking shadows without reducing overall transmittance
3Object-affected harmful factors
If an air gap between an LED and a membrane is enlarged to block LED light shadow, then LED light shadow blocking is improved, but module thickness is increased and shockproof performance is degraded
Solution Approach 1:
Instead of solving the light shadow problem by increasing the air gap in the vertical dimension (which increases thickness), the patent introduces diffusion blocks that work in the optical dimension by scattering light laterally. This dimensional shift in the solution approach effectively blocks shadows without increasing module thickness
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 optimizes LED light shadowing, improving display quality and reducing costs by filling air gaps between LED chips with diffused light, maintaining module thickness and power efficiency, and enabling thinner, cost-effective mini-LED modules.
Implementation Method 1
The out-light sides of the LED light-emitting chips are further provided with a plurality of diffusion blocks. The diffusion blocks are in a one-to-one correspondence with the LED chips respectively. There is a plurality of particles in the diffusion blocks. A particle size of the particle is greater than 15 micrometers. A haze of the diffusion blocks are greater than 80%.
Data Source
AI summary
The present invention provides a backlight module and a display device using the backlight module. The present invention has the following advantage: An LED light shadow can be effectively optimized, and an overall display effect of a mini-LED can be improved; a problem of a mini-LED light shadow is optimized without increasing a module thickness and a module power loss as much as possible; and with a same thickness, a design of fewer LED lights can be implemented, and costs of medium- and large-sized mini-LED modules can be reduced.