Direct-Type Backlight Lens Array for Uniform LCD Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing direct-type backlight modules for LCD displays face challenges in achieving balanced efficiency and cost reduction, with edge-type modules increasing production costs and likelihood of uneven light emission, affecting display quality.
Innovation Solution
A direct-type backlight module design featuring a lens array unit with curved surfaces corresponding to light emitting units, using transparent polymethylmethacrylate (PMMA), polycarbonate (PC), or cyclic olefin polymer (COC) materials, and adjustable film materials to enhance light emission uniformity and viewing angle control, eliminating the need for additional heat dissipation units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If edge-type backlight module is used, then light source can be provided, but production cost increases and light emission uniformity deteriorates
Solution Approach 1:
The backlight module is segmented into multiple independent light emitting units (LEDs) arranged in an array, with each unit having its own dedicated lens array unit. This segmentation allows for simpler manufacturing of individual components while maintaining overall system performance and light emission uniformity.
Solution Approach 2:
A lens array unit is introduced as an intermediary component between the light emitting units and the display panel. The lens array unit includes multiple lens units that redirect light from corresponding light emitting units, serving as a mediator to achieve uniform light emission without requiring complex edge-type light guide plate designs.
2Illumination intensity
If higher wattage LEDs are used to improve light emission, then brightness increases, but heat generation increases requiring additional heat dissipation units
Solution Approach 1:
Each lens unit in the lens array unit features a curved surface (spheroidal or aspherical shape) that efficiently redirects light from the light emitting units. This curved geometry optimizes light extraction and distribution, improving brightness uniformity and allowing the use of lower wattage LEDs while reducing heat generation and eliminating the need for additional heat dissipation structures.
3Ease of manufacture
If direct-type backlight module is used, then production cost is reduced, but light emission uniformity and viewing angle control are insufficient
Solution Approach 1:
The backlight module is segmented into multiple independent light emitting units (LEDs) arranged in an array, with each unit having its own dedicated lens array unit. This segmentation allows for simpler manufacturing of individual components while maintaining overall system performance and light emission uniformity.
Solution Approach 2:
A lens array unit is introduced as an intermediary component between the light emitting units and the display panel. The lens array unit includes multiple lens units that redirect light from corresponding light emitting units, serving as a mediator to achieve uniform light emission without requiring complex edge-type light guide plate designs.
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
Improves light emission efficiency, allows use of lower wattage LEDs, enhances display quality, and reduces costs by increasing light uniformity and eliminating the need for additional heat dissipation units.
Implementation Method 1
The plurality of curved surfaces are disposed on one side of the lens array unit facing the light emitting module or on another side of the lens array unit opposite to the side, or disposed on both sides of the lens array unit, thereby refracting the light emitted from the light emitting unit through the corresponding curved surfaces
Data Source
AI summary
A direct-type backlight module includes a light emitting module and a lens array unit. The light emitting module includes a plurality of light emitting units arranged in an array. The lens array unit is disposed on the light emitting module. Moreover, the lens array unit is provided with a plurality of curved surfaces corresponding to the plurality of light emitting units, respectively, and the plurality of curved surfaces are disposed on one side of the lens array unit facing the light emitting module or another side thereof opposite to the side, or on both sides of the lens array unit.