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, and minimizing the halo phenomenon while maintaining cost-effectiveness, particularly in the overlap of light distribution coverages and the need for flexible control of light sources.
Innovation Solution
A display device structure with a backlight unit comprising a substrate, optical packages, and lenses, where each optical package includes multiple light sources separated by partition walls, allowing for independent control of brightness and formation of local dimming blocks to optimize light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple light sources are provided in one optical package to form local dimming blocks, then the contrast ratio is improved and halo phenomenon is minimized, but the device complexity increases
Solution Approach 1:
The optical package is segmented into multiple light sources (first light source and second light source) separated by partition walls, allowing independent control of each light source to form multiple local dimming blocks within a single optical package, thereby improving contrast ratio and minimizing halo phenomenon
Solution Approach 2:
Different regions within the optical package are assigned different light sources with potentially different brightness levels and control modes, enabling localized brightness adjustment to optimize image quality and reduce halo effects in specific areas of the display
2Manufacturing precision
If the number of local dimming blocks is increased to improve image quality, then the halo phenomenon is reduced, but the manufacturing cost increases
Solution Approach 1:
Multiple light sources are merged into a single optical package housing, sharing common structural elements and control infrastructure, which allows increasing the number of local dimming blocks without proportionally increasing manufacturing costs
3Area of stationary object
If light sources are arranged closely to maximize space utilization, then the device size is reduced, but the light distribution coverage overlap increases
Solution Approach 1:
Partition walls are introduced to extract and block the harmful light distribution overlap between adjacent light sources, allowing close arrangement of light sources to maximize space utilization while preventing negative light interference
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 minimizing light overlap and reducing the halo effect, while reducing manufacturing costs through increased local dimming blocks and flexible brightness 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
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.