Backlight Optical Package Layout for Halo-Reduced Local Dimming
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Solution Overview
Problem
Existing display devices face challenges in improving image quality, contrast ratio, minimizing halo phenomena, and reducing manufacturing costs, particularly due to overlapping light distribution coverages and limited control over light sources.
Innovation Solution
A display device structure incorporating a backlight unit with optical packages featuring multiple light sources, partition walls, and lenses that allow for independent control of light source brightness and arrangement, enabling local dimming blocks and minimizing light source overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are provided in one optical package to increase local dimming blocks, then image quality and contrast ratio are improved, but light distribution coverage overlap increases
Solution Approach 1:
The optical package is segmented into multiple independently controllable light sources (first light source and second light source) separated by partition walls. Each light source can be controlled individually to form distinct local dimming blocks, allowing precise control over illumination patterns to improve image quality while minimizing unwanted light overlap that causes halo effects.
Solution Approach 2:
Different regions of the optical package are assigned different functions through the partition walls. The first light source and second light source are positioned in separate local regions with their own light distribution characteristics, enabling localized illumination control that enhances contrast ratio without creating overlapping light coverage in problematic areas.
2Object-generated harmful factors
If partition walls are added between light sources to minimize light overlap, then halo phenomenon is reduced, but device complexity increases
Solution Approach 1:
Partition walls are introduced to divide the optical package into distinct sections for each light source. These partition walls physically separate the light paths of the first and second light sources, preventing light overlap and reducing halo phenomena, while maintaining a relatively simple overall package structure.
3Illumination intensity
If individual control of each light source is implemented to increase local dimming blocks, then contrast ratio is improved, but manufacturing cost increases
Solution Approach 1:
Multiple light sources and their control circuits are integrated into a single optical package unit. This merging approach allows individual control of each light source for improved contrast ratio while simplifying manufacturing by treating the entire assembly as one modular component that can be produced and tested as a complete unit.
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
Enhances image quality and contrast ratio by reducing halo effects while potentially lowering manufacturing costs through improved light management and control.
Implementation Method 1
a lens covering the optical package
Implementation Method 2
a first light source on the substrate; a second light source adjacent to the first light source
Data Source
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AI summary
Disclosed is a display device. The display device of the present disclosure may include: a display panel; and a backlight unit providing light to the display panel, wherein the backlight unit may include: a substrate; a plurality of optical packages located on the substrate; and a lens covering the optical package, wherein the optical package may include: a first light source on the substrate; a second light source adjacent to the first light source; and a partition wall between the first light source and the second light source, wherein in a first mode of the optical package, both the first light source and the second light source may be turned on, and a brightness of the first light source and a brightness of the second light source are controlled, wherein in a second mode of the optical package, the first light source is turned on, and a brightness of the first light source is controlled, but the second light source is turned off, wherein in a third mode of the optical package, the second light source is turned on, and a brightness of the second light source is controlled, but the first light source is turned off.