Acute-Angle Sidewall Light Source Module for Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light source modules face challenges in achieving luminance uniformity, particularly near the edges and corners of the sidewall, due to inefficient light reflection, which increases cost and weight when attempting to address dark shadows.
Innovation Solution
A light source module design with a back plate and light-emitting units, where the included angle between the sidewall and the bottom plate is acute, and the light-emitting units are positioned to direct light at a specific radiation angle, calculated using tangent functions, to ensure efficient reflection and emission of light towards the sidewall, thereby improving luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the number of light-emitting units is reduced to lower cost and weight, then manufacturing cost and weight decrease, but luminance uniformity deteriorates due to dark shadows near sidewall edges
Solution Approach 1:
The patent applies local quality by differentiating the positioning of light-emitting units based on their location. Target light-emitting units near the sidewall are positioned at a first distance from the sidewall, while other light-emitting units are positioned at a second distance. This localized differentiation ensures that edge regions receive adequate light reflection without requiring increased overall unit density, thus maintaining luminance uniformity while controlling weight.
Solution Approach 2:
The patent changes the positioning parameter (distance from sidewall) of specific light-emitting units to optimize light reflection. By adjusting the distance parameter d for target light-emitting units based on the reflection angle θ and sidewall angle α, the system achieves improved light distribution and luminance uniformity without increasing the total number of units, thereby maintaining weight efficiency.
2Device complexity
If light-emitting units are positioned far from the sidewall to reduce complexity, then positioning simplicity increases, but light reflection efficiency deteriorates causing dark shadows
Solution Approach 1:
The patent optimizes the positioning parameter d of target light-emitting units using a calculated relationship involving the radiation angle θ and sidewall angle α. This parameter optimization ensures that light emitted at angle θ reflects efficiently off the sidewall at angle α, maximizing light reflection efficiency without requiring complex positioning mechanisms or increased unit density.
3Illumination intensity
If the number of light-emitting units is increased to eliminate dark shadows, then luminance uniformity improves, but weight and cost increase
Solution Approach 1:
The patent applies local quality by implementing differentiated positioning only for target light-emitting units near the sidewall, while other units maintain standard positioning. This localized approach addresses luminance uniformity issues at critical edge regions without requiring a system-wide increase in unit density, thus achieving improved luminance uniformity while controlling overall weight.
Solution Approach 2:
The patent optimizes the positioning parameter d for target light-emitting units using calculated relationships involving radiation angle θ and sidewall angle α. This parameter optimization maximizes light reflection efficiency from the sidewall, ensuring adequate illumination at edges without requiring additional light-emitting units, thereby maintaining weight efficiency while improving luminance uniformity.
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 enhances luminance uniformity by ensuring that over 50% of light is reflected and emitted upwards, meeting requirements for backlight modules and display devices, while maintaining cost and weight efficiency.
Implementation Method 1
a portion of a surface of the sidewall which ranges from the predetermined location to a top edge of the sidewall can reflect more than 50% of light generated by each of the target light-emitting units
Data Source
AI summary
A light source module includes a back plate and light-emitting units. The back plate includes a bottom plate and a sidewall. An included angle is formed between an outer side surface of the sidewall and a horizontal plane where the bottom plate is located, and the included angle is an acute angle. An optical distance is defined between a top end of the sidewall and the horizontal plane. The light-emitting units are arranged in the back plate. The light-emitting units which are closest to the sidewall are defined as target light-emitting units, and each of the target light-emitting units has a radiation angle, and each of the target light-emitting units is separated from the sidewall by a distance. The first horizontal distance is determined by a tangent function of a complementary angle of the radiation angle, the second horizontal distance is determined by a tangent function of the included angle.