LED Light Source Light Adjustment Layer Firefly Effect
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Solution Overview
Problem
The existing LED light sources have a fixed light-emitting angle that cannot be effectively adjusted, leading to undesirable optical phenomena like 'firefly' effects and reduced light utilization efficiency, particularly in liquid crystal display devices and backlight modules.
Innovation Solution
The introduction of a light adjustment layer at the light outlet of the LED light source, which can be designed as a scattering layer or a prism layer, allows for the adjustment of the light-emitting angle by diffusing or gathering light, thereby increasing the light-emitting angle and improving light utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the light-emitting angle of the LED light source is increased to avoid the 'firefly' phenomenon, then the display quality is improved, but the light utilization efficiency deteriorates because light beyond the thickness of the light guide plate is wasted
Solution Approach 1:
A light adjustment layer is introduced as an intermediary component between the LED light source and the light guide plate. This layer acts as a mediator that modifies the light emission characteristics, enabling the LED to emit light at an appropriate angle that matches the light guide plate's thickness, thereby preventing the firefly phenomenon while maximizing light utilization efficiency.
Solution Approach 2:
The patent changes the light emission parameters by introducing a light adjustment layer with specific optical properties. This layer modifies the light-emitting angle parameter of the LED source, transforming it from a fixed large angle to a controlled angle that optimizes both display quality (preventing firefly effect) and light utilization efficiency.
2Loss of energy
If the light-emitting angle of the LED light source is decreased to improve light utilization efficiency, then the light waste is reduced, but the display quality deteriorates due to the 'firefly' phenomenon
Solution Approach 1:
The light adjustment layer serves as an intermediary that prevents direct interaction between the LED's fixed large emission angle and the light guide plate's thickness constraint. By positioning this layer between the LED and the light guide plate, it mediates the optical interaction to achieve both goals.
Solution Approach 2:
The light adjustment layer changes the effective light-emitting angle parameter of the LED source. Instead of modifying the LED itself, the layer alters the angular distribution of emitted light, transforming the parameter to simultaneously improve light utilization and eliminate the firefly phenomenon.
3Ease of manufacture
If the light-emitting angle is fixed by the support cup depth or lens design, then the manufacturing process is simplified, but the adaptability to different display requirements deteriorates
Solution Approach 1:
The patent segments the light emission control function from the LED structure itself by introducing a separate light adjustment layer. This segmentation allows the LED to maintain its simple fixed-angle design for ease of manufacture, while the adjustable light adjustment layer provides the necessary adaptability for different display requirements.
Solution Approach 2:
The light adjustment layer serves multiple functions: it maintains ease of manufacture by allowing fixed LED designs, provides adaptability through adjustable light emission angles, and improves both display quality and light utilization efficiency. This multi-functionality resolves the contradiction between manufacturing simplicity and adaptability.
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 solution prevents the 'firefly' phenomenon and enhances light utilization by allowing the light-emitting angle to be adjusted, reducing the number of LED sources needed in backlight modules and improving display quality and efficiency.
Implementation Method 1
a light adjustment layer disposed at the light outlet of the housing... which can be designed as a scattering layer or a prism layer, allows for the adjustment of the light-emitting angle by diffusing or gathering light
Data Source
AI summary
An LED light source, a backlight module and a liquid crystal display device are disclosed. The LED light source includes: a housing having a light outlet; an LED wafer disposed within the housing, where a light-emitting surface of the LED wafer faces towards the light outlet of the housing; and a light adjustment layer disposed at the light outlet of the housing.