Backlight Film Protrusion Layout for Uniform Light Distribution
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Solution Overview
Problem
Existing backlight modules face issues with non-uniform light distribution and size, leading to problems like mura and hotspots in display devices.
Innovation Solution
A backlight module design featuring a diffuser with protrusions on its bottom surface, where the light emitting units are positioned on a circuit board with a specific pitch greater than the optical distance to the diffuser, and the light path includes a film with protrusions aligned parallel to the light bar, enhancing light distribution and reducing module size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional backlight module design is used, then the structure is simple, but the light distribution is non-uniform causing mura and hotspots
Solution Approach 1:
The patent applies local quality by creating protrusions at specific locations on the diffuser's bottom surface. These protrusions are positioned to correspond with light emitting units, locally modifying the light diffusion characteristics in those areas to achieve more uniform overall light distribution and reduce hotspots and mura effects.
Solution Approach 2:
The diffuser surface is segmented into multiple protrusions rather than being a flat continuous surface. This segmentation allows different regions of the diffuser to handle light differently, with each protrusion acting as an independent light redistribution element, improving overall light uniformity.
2Manufacturing precision
If the pitch between light emitting units is increased, then light distribution improves, but the module size increases
Solution Approach 1:
The patent changes the geometric parameters of the diffuser by adding protrusions with specific dimensions and positions. This modifies the optical parameters of the system, allowing for better light distribution uniformity while maintaining a smaller pitch between light emitting units, thus reducing the overall module area.
3Area of stationary object
If the optical distance between film and circuit board is reduced, then module size decreases, but light distribution uniformity worsens
Solution Approach 1:
By adding protrusions at specific locations on the diffuser, the patent locally enhances light diffusion in critical areas. This allows the optical distance to be reduced while maintaining light distribution uniformity, as the protrusions compensate for the reduced distance by creating localized light redistribution zones.
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 design achieves more uniform light distribution, reduces the likelihood of mura and hotspots, and minimizes the overall size of the backlight module while improving light utilization efficiency.
Implementation Method 1
the film is disposed on the plurality of light emitting units and includes a plurality of protrusions... achieves more uniform light distribution
Implementation Method 2
The reflection layer is disposed on the side portion and the bottom portion... improving light utilization efficiency
Data Source
AI summary
A light emitting device is provided. The light emitting device includes a backplate, a reflection layer, a circuit board, a plurality of light emitting units, and a film. The backplate includes a side portion and a bottom portion connecting to the side portion. The reflection layer is disposed on the side portion and the bottom portion. The circuit board is disposed on the bottom portion. The plurality of light emitting units are disposed on the circuit board. The film is disposed on the plurality of light emitting units and includes a plurality of protrusions. The extending direction of the lengthwise side of the circuit board is parallel to the extending direction of the plurality of protrusions. The pitch between two adjacent ones of the plurality of light emitting units is greater than the optical distance between the film and the circuit board.