Backlight Diffuser Structure for Uniform Light in Thin Modules
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Solution Overview
Problem
Existing backlight modules face issues with non-uniform light distribution and size, leading to problems such as mura and hotspots in display devices.
Innovation Solution
A backlight module design featuring a diffuser with a bottom surface containing protrusions, an optical distance between the diffuser and circuit board within a specific range, and a pitch ratio between light emitting units, enhancing light distribution and reducing module size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical distance between the diffuser and circuit board is reduced to minimize module size, then the size of the backlight module is reduced, but the light distribution uniformity deteriorates causing mura and hotspots
Solution Approach 1:
The diffuser surface is designed with protrusions at specific locations corresponding to light emitting units, creating local structural variations that enhance light scattering in critical areas. This local quality modification allows the diffuser to effectively control light distribution even at reduced optical distances, preventing mura and hotspots while maintaining compact module size.
Solution Approach 2:
The patent optimizes the optical distance parameter to a specific range (0.05mm to 0.5mm) and controls the pitch ratio between light emitting units (0.1 to 0.7). By precisely controlling these parameters, the system achieves optimal light distribution uniformity while maintaining minimized module size, resolving the contradiction between compactness and uniformity.
2Quantity of substance
If the pitch between light emitting units is reduced to increase density, then the number of light emitting units per area is increased, but the light distribution uniformity deteriorates
Solution Approach 1:
The diffuser incorporates protrusions strategically positioned at locations corresponding to light emitting units. This local structural enhancement allows each light emitting unit's light to be effectively scattered, maintaining uniform light distribution even when the pitch between units is reduced and unit density is increased.
Solution Approach 2:
The patent introduces a vertical dimension element through the protrusions on the diffuser surface. This three-dimensional structure adds light scattering capability in the vertical direction, compensating for the reduced horizontal spacing between light emitting units and maintaining overall light distribution uniformity.
3Illumination intensity
If the optical distance is increased to improve light distribution uniformity, then the light distribution becomes more uniform, but the overall size of the backlight module increases
Solution Approach 1:
By incorporating protrusions at specific locations on the diffuser surface, the patent creates localized light scattering centers that enhance light distribution uniformity without requiring increased optical distance. This allows the system to achieve good uniformity while maintaining a compact module size.
Solution Approach 2:
The protrusions on the diffuser act as intermediary structures between the light emitting units and the display panel. These protrusions modify the light path and enhance scattering, serving as a mediator that achieves uniform light distribution without requiring increased spacing between components.
4Illumination intensity
If protrusions are added to the diffuser to enhance light scattering, then the light distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
Instead of making the entire diffuser surface complex, the patent applies protrusions only at specific strategic locations corresponding to light emitting units. This localized approach enhances light scattering effectiveness while minimizing the overall structural complexity of the diffuser component.
Solution Approach 2:
The diffuser surface is segmented into different regions: areas with protrusions at light emitting unit locations and flat areas elsewhere. This segmentation allows the protrusions to perform specific light scattering functions where needed without making the entire diffuser structure complex.
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 occurrence of mura and hotspots, and minimizes the overall size of the backlight module.
Implementation Method 1
a bottom surface having a plurality of protrusions... The emitted light may distribute as desired
Implementation Method 2
The reflection layer is disposed on the side portion and the bottom portion
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. 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. The ratio of the optical distance to the pitch of adjacent two of the plurality of light emitting units ranges from 0.1 to 0.7.