Inclined Light Emitting Device Array for Backlight Uniformity
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Solution Overview
Problem
Existing backlight units face challenges in achieving uniform light emission and a slim, lightweight design, particularly in guiding light effectively to the edges of liquid crystal display devices, which affects productivity and user convenience.
Innovation Solution
A light emitting device array with a substrate featuring inclined regions and packages, where the first light emitting device package is arranged on one region and at least one second package is inclined between 90° and 160° relative to the first, ensuring controlled beam angles and reducing the number of packages needed for uniform edge illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting device packages are arranged in a conventional configuration, then light emission coverage is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The substrate is designed with an asymmetric inclined surface instead of a conventional flat or symmetric structure. The inclination angle ranges from 10° to 70° relative to the reference plane, creating an asymmetric geometry that naturally directs light toward the edge of the liquid crystal display device. This asymmetric configuration allows a reduced number of light emitting device packages to achieve uniform light emission across the display area, resolving the contradiction between illumination uniformity and device complexity.
Solution Approach 2:
The invention transitions from a conventional two-dimensional flat substrate arrangement to a three-dimensional inclined surface configuration. By tilting the substrate at a specific angle, light is directed in a controlled manner toward the edge of the display device, utilizing the third dimension (vertical angle) to optimize light distribution. This dimensional change enables fewer packages to cover the required area effectively.
2Illumination intensity
If more light emitting device packages are used to ensure uniform emission, then light uniformity is improved, but weight and volume of the backlight unit increase
Solution Approach 1:
The asymmetric inclined substrate configuration optimizes light directionality, allowing a minimal number of light emitting device packages to achieve uniform illumination. This reduces the total weight of the backlight unit compared to conventional designs that require more packages arranged on flat or symmetric substrates to achieve the same uniformity.
3Ease of manufacture
If conventional flat substrate configuration is used, then manufacturing is simpler, but light uniformity and coverage are insufficient
Solution Approach 1:
While the inclined substrate introduces a moderate increase in manufacturing complexity compared to flat substrates, it significantly improves light emission uniformity. The inclination angle of 10° to 70° can be integrated into existing manufacturing processes through precision molding or machining, achieving a balance between ease of manufacture and optical performance.
Solution Approach 2:
The substrate exhibits different orientations in different regions: the inclined surface for light direction and the reference plane for structural support. This local differentiation of geometric properties allows the substrate to simultaneously achieve good light uniformity and maintain compatibility with manufacturing processes.
4Area of stationary object
If light emitting device packages are arranged to cover the entire area, then light coverage is improved, but the backlight unit becomes bulkier and less slim
Solution Approach 1:
By utilizing the inclined surface geometry, light is directed more efficiently toward the edge of the display device, maximizing light coverage in the horizontal plane without increasing the vertical thickness of the backlight unit. This three-dimensional arrangement allows full area coverage with a compact, slim profile.
Solution Approach 2:
The asymmetric inclined configuration concentrates light emission toward the edge region, achieving effective full-area coverage with fewer packages arranged in a compact footprint, thereby maintaining a slim backlight unit volume.
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 enhances light uniformity and reduces the number of packages required, contributing to a more efficient and compact backlight unit that improves productivity and user experience by minimizing dark zones and achieving high brightness with appropriate viewing angles.
Implementation Method 1
Light Emitting Diodes (LEDs) are devices that convert electrical signals into light using characteristics of compound semiconductors
Implementation Method 2
the LED emits visual light with light energy generated when electrons and holes are combined
Implementation Method 3
a substrate including a first region and a second region that is inclined with respect to the first region, a first light emitting device package arranged on the first region, and at least one second light emitting device package that is arranged on the second region and is inclined with respect to the first light emitting device package at an inclination angle between 90° and 160°
Implementation Method 4
a light guide plate that diffuses light generated by the light source
Implementation Method 5
optical sheets that function to spread or focus light emitted from the light guide plate
Data Source
AI summary
A light emitting device array includes a substrate including a first region and a second region that is inclined with respect to the first region, a first light emitting device package arranged on the first region, and a second light emitting device package that is arranged on the second region and is inclined with respect to the first light emitting device package at an inclination angle between 90° and 160°.