Backlight Module Edge Light Source Boundary Control
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Solution Overview
Problem
Conventional backlight modules with local dimming suffer from visible joining boundaries due to brightness differences between light guide plates, leading to decreased display quality and increased manufacturing costs when attempting to address this issue.
Innovation Solution
A backlight module design featuring light guide plates divided into regions with both middle and edge light sources, where each light source set includes at least one middle light source and one or more edge light sources, electrically connected to controlling circuits to ensure synchronized lighting across regions, thereby blurring the joining boundaries and enhancing uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming is used with multiple light guide plates, then high dynamic contrast display effect is achieved, but visible joining boundaries appear due to brightness differences between plates
Solution Approach 1:
The patent introduces an intermediary optical element (diffusing film or scattering layer) between the light guide plates to soften and redistribute the light at joining boundaries. This intermediary component acts as a mediator that blends the light output from adjacent plates, reducing the visual impact of brightness differences while preserving the local dimming effect for contrast enhancement.
Solution Approach 2:
The patent applies different optical properties to different regions of the light guide plate system. Specifically, the joining boundary regions are treated with special optical films or scattering structures that have different light diffusion characteristics compared to the central regions. This local differentiation allows the boundaries to be softened without affecting the overall contrast performance of the display.
2Object-affected harmful factors
If additional optical films with diffusing function are added to resolve joining boundaries, then boundary visibility is reduced, but weight and cost increase and total brightness decreases
Solution Approach 1:
The patent modifies the optical parameters of existing components rather than adding new layers. By adjusting the refractive indices, scattering coefficients, or surface microstructures of the light guide plates and their interfaces, the system achieves boundary softening through parameter optimization. This approach avoids the brightness loss associated with additional diffusing films while still reducing joining boundary visibility.
Solution Approach 2:
The patent creates multiple light guide plates with identical or mirrored optical structures and brightness characteristics. By ensuring that adjacent plates are optical copies or near-copies of each other in terms of light emission properties, the joining boundaries become less noticeable. This copying strategy eliminates boundary visibility issues without requiring additional diffusing optical films, thereby preserving total brightness.
3Illumination intensity
If the number of local dimming regions is increased, then display quality improves, but manufacturing cost and processing difficulty increase
Solution Approach 1:
The patent divides the backlight system into multiple independently controllable light guide plate segments, each capable of local dimming. This segmentation allows for increased display quality through finer control of different display regions while maintaining manageable manufacturing complexity. Each segment can be processed and assembled separately, reducing the overall processing difficulty compared to a monolithic high-resolution dimming system.
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
This design effectively reduces sharp contrast at joining boundaries, improving display quality and reducing manufacturing costs by maintaining uniform brightness and avoiding the need for additional optical films or increased power consumption.
Implementation Method 1
a light guide plate having a plurality of regions, wherein each region of the light guide plate has a light incident surface correspondingly
Data Source
AI summary
A backlight module including a light guide plate, light source sets, and controlling circuits is provided. The light guide plate has a plurality of regions, and each region of the light guide plate has a light incident surface correspondingly. Each light source set is disposed at the light incident surface of one of the regions of the light guide plate, and each light source set has at least one middle light source and at least one edge light source. The middle light source is disposed in a middle region of the light source set and the edge light source is disposed at an edge of the light source set. Each controlling circuit is electrically connected to the middle light source of one of the light source sets, and the edge light source of each light source set is electrically connected to the controlling circuit of the adjacent light source set.