Edge-Type Backlight Unit Without Light Guide Plate
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Solution Overview
Problem
Existing edge type backlight units for liquid crystal display apparatuses face challenges in achieving optimum image quality without a light guide plate, which is necessary for slimness, as removing the light guide plate compromises image quality.
Innovation Solution
The implementation of an edge type backlight unit design that includes a light source unit with an optical lens and a reflection sheet, where the optical lens is vertically asymmetrical and the reflection sheet is strategically positioned to reflect light emitted from the light source unit towards the display panel, eliminating the need for a light guide plate while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a light guide plate is provided in the edge type backlight unit, then light can be effectively guided from the side surface to the front side of the display panel, but the display apparatus occupies a large volume and cannot achieve slimness
Solution Approach 1:
The patent removes the light guide plate from the backlight unit structure, extracting this component that caused increased thickness. The light source unit is repositioned to directly face the display panel, eliminating the need for light induction through a light guide plate, thereby achieving a thinner display apparatus while maintaining necessary lighting function
Solution Approach 2:
The light source unit is positioned at the rear side of the display panel facing the panel directly, changing the spatial arrangement from side-surface mounting (edge type with light guide plate) to rear-side direct mounting. This dimensional repositioning eliminates the need for light guide plates while achieving slimness
2Length of moving object
If the light guide plate is removed to achieve slimness, then the display apparatus becomes thinner, but it becomes difficult to realize optimum image quality
Solution Approach 1:
A reflection sheet is introduced as an intermediary component between the light source unit and the display panel. This reflection sheet redirects light that would otherwise be lost toward the panel, ensuring uniform light distribution and maintaining optimal image quality even without a light guide plate
Solution Approach 2:
The optical characteristics of the light source unit are optimized by positioning it at a specific distance from the display panel and adjusting its emission parameters. The reflection sheet's reflective properties are also optimized to ensure uniform light distribution across the panel, maintaining image quality without the light guide plate
3Illumination intensity
If a light guide plate is used, then light distribution can be achieved, but the display apparatus becomes heavier and larger
Solution Approach 1:
The light guide plate, which adds significant weight and volume, is completely removed from the structure. The lighting function is achieved through a simpler configuration with the light source unit directly facing the display panel and a reflection sheet, dramatically reducing the overall weight of the display apparatus
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 design allows for uniform light distribution and optimal image quality without the light guide plate, resulting in a slimmer and lighter display apparatus that adheres to the latest slimness trends.
Implementation Method 1
a reflection sheet disposed to be spaced a predetermined distance downward from the optical sheet to reflect the light emitted from the at least one light source unit toward the optical sheet
Data Source
AI summary
Provided are a backlight unit and a display apparatus including the same. An optical lens of an optical unit has a shape asymmetrical with respect to a plane that bisectionally divides a center of an optical package. A plurality of reflectors each of which has an embossed or engraved shape are disposed on a top surface of the reflection sheet.