Backlight Unit Narrow Bezel Local Dimming
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Solution Overview
Problem
Conventional liquid crystal displays face challenges in achieving a super narrow bezel design and improving local dimming performance, which affects image quality and contrast ratio due to issues with light distribution and moiré phenomena.
Innovation Solution
The liquid crystal display incorporates a light guide plate with prism-shaped or lens-shaped ridges, a light source unit with LEDs, and a printed circuit board for thermal management, along with optical sheets and a diffusing plate, to provide uniform light distribution and enable local dimming by controlling light emission from multiple blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional backlight unit configuration is used, then the structure is simple, but the bezel width cannot be reduced to super narrow
Solution Approach 1:
The light source unit is divided into multiple independent light source blocks (first, second, third, and fourth light source blocks) positioned at different locations around the light guide plate. Each block can be independently controlled to emit or stop light, enabling local dimming functionality and super narrow bezel design by selectively managing light distribution in different regions.
2Manufacturing precision
If conventional light distribution is used, then the structure is simple, but local dimming performance and image quality are poor
Solution Approach 1:
Different regions of the backlight unit are designed with different optical properties. The light guide plate includes a first region with a first refractive index and a second region with a second refractive index, where the refractive indices differ. This enables different light distribution characteristics in different regions, achieving superior local dimming performance and image quality by controlling light propagation locally.
3Manufacturing precision
If uniform light distribution is achieved, then image quality improves, but moiré phenomena occur
Solution Approach 1:
The light guide plate is divided into regions with different refractive indices to create varied light distribution patterns. This local variation in optical properties prevents the uniform periodic patterns that cause moiré effects, while still achieving high image quality through controlled local dimming and optimized light propagation in different regions.
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 configuration results in a super narrow bezel design with improved image quality and contrast ratio, reducing moiré phenomena and enabling efficient local dimming, thereby enhancing the overall display performance.
Implementation Method 1
a light guide plate comprising a least one side surface through which receives light from the light source unit, wherein the light guide plate emits light to the liquid crystal panel
Implementation Method 2
a printed circuit board which supports the light source units and is disposed adjacent to a lower surface of the light guide plate
Data Source
AI summary
A liquid crystal display is provided. The liquid crystal display includes a liquid crystal panel, a light guide plate disposed below the liquid crystal panel, and a light source unit which emits light to at least one side surface of the light guide plate. The light source unit includes light source elements which are disposed adjacent to the at least one side surface of the light guide plate, and which emit light that is incident on the at least one side surface of the light guide plate. A printed circuit board is disposed adjacent to a lower surface of the light guide plate and supports the light source elements.