Backlight Assembly Light Guide Plate Merging
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Solution Overview
Problem
Traditional edge lighting backlight assemblies face challenges in maintaining light uniformity as the size increases, with differences in physical properties of smaller light guide plates and modules leading to discontinuities and non-uniform luminance, and local dimming techniques exacerbate edge faults due to the configuration of light sources and guide plates.
Innovation Solution
A backlight assembly design featuring a back plate with misaligning light guide plates and modules, where each light guide plate receives light from two adjacent modules, driven by a unit to provide consistent illumination, and includes reflectors and optical films to enhance light transmission and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple smaller-sized light guide plates are combined to form a large backlight assembly, then the backlight assembly can achieve larger size while maintaining luminance and uniformity above standard, but light emitted from each block differs due to physical property differences and assembly variations, causing discontinuity and edge faults
Solution Approach 1:
The patent combines multiple light guide plates into a single integrated light guide plate structure, eliminating the boundaries and discontinuities between separate plates. This merging approach ensures uniform light emission across the entire large-area backlight assembly while maintaining the benefits of modular construction through the integrated design.
2Loss of energy
If local dimming is implemented by turning on part of the LEDs, then power consumption is reduced and contrast is improved, but the edge between lit and unlit blocks becomes much more obvious in edge lighting configurations
Solution Approach 1:
The integrated light guide plate design merges the light distribution across the entire panel, allowing smooth transitions between dimmed and bright regions. This eliminates the harsh edges between lit and unlit blocks that occur in traditional edge lighting with separate light guide plates, enabling effective local dimming without visible boundaries.
3Manufacturing precision
If a single large-sized light guide plate is used, then light uniformity can be maintained across the entire assembly, but the thickness of the direct-type backlight assembly becomes greater compared to edge lighting configurations
Solution Approach 1:
The patent transitions from edge lighting (light entering from the side) to direct-type lighting (light entering from the rear), changing the dimensional approach to light distribution. This allows the use of a single large light guide plate with improved light uniformity while managing thickness through the direct illumination approach and optimized light guide plate design.
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 achieves improved light uniformity and reduced edge faults by ensuring consistent light distribution across larger areas, with the ability to perform local dimming without emphasizing the edges between lit and unlit blocks, thus enhancing display quality and power efficiency.
Implementation Method 1
a first light guide plate, a second light guide plate... the light module is configured for facing both the first incident side and the second incident side
Data Source
AI summary
Backlight assembly includes a plurality of light guide plates, a plurality of light modules, and a plurality of driving units separately in control of corresponding light modules which are configured at the incident sides of the LGPs. Each light module faces two adjacent LGPs such that the driving unit drives the light module to provide light for two adjacent LGPs at the same time. As local dimming function is switched, besides the power-saving and the high contrast, the local edge effect due to the joint of the LGPs can be reduced.