Backlight Unit Stepped Light Guide Plate
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Solution Overview
Problem
Backlight units using light emitting diodes face challenges in achieving slimness, light weight, and uniform light emission, with existing designs often resulting in light leakage and inefficiencies due to gaps between the light guide plate and optical sheet.
Innovation Solution
A backlight unit design featuring a light guide plate with a stepped upper surface and an optical sheet placed on a region of lower height, reducing the gap between the two components to minimize light leakage and enhance reliability, while allowing for a slim and efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light guide plate with a flat upper surface is used, then the structure is simple and easy to manufacture, but light leakage occurs and light emission reliability is poor
Solution Approach 1:
The light guide plate is segmented into multiple regions with different heights (first region with higher height, second region with lower height), creating a stepped structure that divides the uniform surface into functional zones for improved light control and reduced leakage
Solution Approach 2:
Different regions of the light guide plate are given different local qualities through varying heights, where the first region has higher height for light emission and the second region has lower height for reducing gaps, optimizing performance in each specific area
2Reliability
If the gap between light guide plate and optical sheet is reduced by using a stepped structure, then light leakage is reduced and reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The height parameter of the light guide plate is changed to create a stepped structure with multiple levels, transforming a single-parameter (uniform height) design into a multi-parameter design that controls gap dimensions and improves light emission reliability
3Volume of moving object
If a stepped upper surface structure is implemented, then product volume is reduced and slimness is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The design transitions from a two-dimensional flat surface to a three-dimensional stepped structure by adding height variation, enabling volume reduction and slimness achievement through vertical dimension optimization
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
The design achieves reduced product volume, improved light emission reliability, and enhanced productivity by minimizing light leakage and ensuring uniform light distribution across the display area.
Implementation Method 1
Light Emitting Diodes (LEDs) are devices which convert electric signals into light using characteristics of compound semiconductors
Implementation Method 2
the light emitting diode emits visible light generated upon electron-hole coupling
Implementation Method 3
a light guide plate configured to diffuse light emitted from the light source
Data Source
AI summary
A backlight unit is provided. The backlight unit may include a light emitting device package, a light guide plate including a first region and a second region extending from the first region, with upper surfaces of the first and second regions being spaced apart so as to form a stepped surface. A recess may be formed in a lateral surface of the second region to receive the light emitting device package, and an optical sheet may be received on the upper surface of the second region of the light guide plate.