Backlight Unit Inclined Reflection Surfaces Light Distribution
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Solution Overview
Problem
Existing direct-type backlight units suffer from non-uniform light distribution due to the zigzag arrangement of light sources, leading to reduced light reflection from side walls and resulting in optical characteristics deterioration and display irregularities in liquid crystal display devices.
Innovation Solution
A backlight unit design featuring light sources arranged on an arrangement surface with inclined reflection surfaces, where large and small inclination areas are strategically positioned to optimize light reflection and distribution, ensuring uniform light output across the irradiation area, reducing power consumption and improving optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If light sources are arranged in a zigzag shape, then the light sources can be positioned on the bottom plate, but the amount of light reflected from side walls becomes non-uniform
Solution Approach 1:
The side walls are divided into different regions with different inclination angles. Specifically, side walls adjacent to light sources have a first inclination angle, while other side walls have a second inclination angle. This local differentiation optimizes light reflection at each position to achieve uniform light distribution across the entire display panel.
Solution Approach 2:
The inclination angles of side walls are changed as a parameter to control light reflection. By setting different inclination angles for different side walls, the system adjusts the reflection characteristics to compensate for the non-uniform light emission from zigzag-arranged light sources, thereby achieving uniform illumination.
2Ease of manufacture
If light sources are positioned distant from side walls, then easier arrangement is achieved, but the amount of light reflected from side walls is reduced
Solution Approach 1:
Different side walls are assigned different inclination angles based on their position relative to light sources. Side walls that need to reflect more light have inclination angles optimized for greater reflection, while other side walls have different angles. This allows the system to maintain ease of light source arrangement while compensating for reduced light reflection through localized geometric optimization.
3Ease of manufacture
If side walls are erected at the same inclination angle, then manufacturing is simplified, but light reflection amount varies across different positions
Solution Approach 1:
The side walls are constructed with different inclination angles in different regions. Specifically, side walls adjacent to light sources have a first inclination angle, while other side walls have a second inclination angle. This local differentiation maintains manufacturing simplicity through standardized sections while achieving uniform light distribution through strategic variation in critical areas.
4Device complexity
If amount of light in irradiation area is non-uniform, then simpler light source arrangement is possible, but display irregularities occur in effective display area
Solution Approach 1:
The inclination angles of side walls are changed as a parameter to control light reflection distribution. By setting different inclination angles for different side walls, the system adjusts the reflection characteristics to compensate for non-uniform light emission, thereby achieving uniform illumination across the display panel and eliminating display irregularities.
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 uniform light distribution, enhancing optical characteristics and reducing display irregularities, allowing for high-quality and bright image display while minimizing power consumption.
Implementation Method 1
a plurality of reflection surfaces which are erected from a plurality of edges of the arrangement surface and reflect light from the plurality of light sources
Data Source
AI summary
A backlight unit includes: an arrangement surface on which a plurality of light sources are arranged, and a plurality of reflection surfaces erected from a plurality of edges of the arrangement surface. The light emitted from the light sources and the light reflected from the reflection surfaces irradiate to an irradiation area surrounded by the reflection surfaces which are each inclined at an inclination angle smaller than 90 degrees with respect to the arrangement surface. At least one reflection surface includes a large inclination area inclined at a large inclination angle and a small inclination area inclined at a small inclination angle. The light source arranged close to the large inclination area is disposed closer to the outside frame of the irradiation area than the other light sources arranged close to the small inclination area in plan view from the irradiation area.