Backlight Unit Light Guide Plate Segmentation for Local Dimming
Solution Overview
Problem
The existing backlight units with glass light guide plates face difficulties in implementing a lenti shape, which deteriorates the local dimming effect due to light spreading issues.
Innovation Solution
A backlight unit design featuring a light guide plate divided into multiple areas, a reflection sheet, and a substrate with a light assembly, where the light guide plate is separated using boundaries to prevent light spread and enhance local dimming capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glass light guide plate is used, then the structure is stable and durable, but it is difficult to implement a lenti shape and local dimming effect is deteriorated
Solution Approach 1:
The light guide plate is divided into multiple independent light guide regions (first light guide region, second light guide region, third light guide region) separated by reflection sheets. This segmentation allows each region to be independently controlled for local dimming while maintaining the overall structural integrity of the glass light guide plate.
Solution Approach 2:
Reflection sheets are introduced as intermediary elements between the light guide regions. These reflection sheets prevent light leakage between adjacent regions and enable the formation of lenti shapes at the boundaries, solving the manufacturing difficulty while maintaining structural stability.
2Reliability
If a glass light guide plate is used, then the structure is stable and durable, but the local dimming effect is deteriorated due to light spreading
Solution Approach 1:
The light guide plate is divided into multiple independently controllable light guide regions separated by reflection sheets. This segmentation prevents light from spreading between regions, allowing precise local dimming control in each region while maintaining the structural stability of the glass material.
Solution Approach 2:
The reflection sheets extract and block light that would otherwise spread between adjacent light guide regions. By removing the harmful light spread effect through these intermediary reflection elements, local dimming performance is improved while the glass structure remains stable.
3Illumination intensity
If the light guide plate is divided into multiple areas with boundaries, then local dimming effect is improved, but the device complexity increases
Solution Approach 1:
The light guide plate is segmented into multiple regions separated by reflection sheets. This segmentation enables independent control of each region for local dimming purposes. The complexity is managed by using simple reflection sheet elements rather than complex optical components.
Solution Approach 2:
The reflection sheets serve multiple functions: they separate light guide regions, prevent light leakage between regions, enable lenti shape formation, and provide structural support. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity.
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 allows for effective local dimming by preventing light from spreading between areas, thereby improving the display's contrast and dimming performance.
Implementation Method 1
a reflection sheet located between the light guide plate and the frame
Data Source
AI summary
A backlight unit including a frame; a substrate located on one side of the frame; a plurality of light assemblies mounted on the substrate; a light guide plate configured to guide light emitted by the light assembly; and a reflection sheet located between the light guide plate and the frame and configured to reflect light emitted by the plurality of light assemblies. In addition, the light guide plate includes a first block including a plurality of light guide areas configured to emit light emitted by a corresponding first set of light assemblies; and a second block including a plurality of light guide areas configured to emit light emitted by a corresponding second set of light assemblies.