Direct-Type Backlight Lens Array for Uniform Light and Lower LED Heat
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Solution Overview
Problem
Existing direct-type backlight modules for LCD displays face challenges in achieving balanced efficiency and cost reduction while ensuring uniform light emission and display quality, particularly in automotive display panels.
Innovation Solution
A direct-type backlight module design incorporating a lens array unit with curved surfaces corresponding to light emitting units, combined with film materials to adjust light emission angles, enhances light uniformity and viewing angle control, allowing the use of lower wattage LEDs and eliminating the need for additional heat dissipation units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a direct-type backlight module uses conventional light emitting units without specialized optical design, then the structure is simple and cost is low, but the light emission efficiency is insufficient and additional heat dissipation units are required
Solution Approach 1:
The patent applies curved surfaces to the lens array unit, where each lens has a specific curvature radius (R1 for the first curved surface, R2 for the second curved surface) that is optimized to match the light emission characteristics of each LED. This curved optical design redirects light more effectively, increasing emission efficiency without requiring additional heat dissipation components, thereby resolving the contradiction between energy efficiency and structural simplicity
Solution Approach 2:
The patent implements position-dependent optical parameters where the curvature radius of each lens in the array varies according to its location. Specifically, lenses closer to the light guide plate have different curvature characteristics than those farther away, optimizing light extraction locally at each position. This localized optimization achieves high overall efficiency while maintaining a single integrated structure without additional heat dissipation units
2Illumination intensity
If edge-type backlight module uses light guide plate with special design, then light distribution can be controlled, but production cost increases and uneven light emission occurs
Solution Approach 1:
The patent segments the light emission function by using individual LEDs arranged in an array, where each LED serves as an independent light source. Above each LED, a corresponding lens in the lens array unit controls the light distribution locally. This segmentation allows precise control of light uniformity across the display panel while using conventional light guide plate manufacturing processes, avoiding the high costs and uniformity problems associated with specially designed edge-type light guide plates
3Illumination intensity
If higher wattage LEDs are used to improve light output, then brightness is increased, but heat generation increases requiring additional heat dissipation units
Solution Approach 1:
The patent converts the potentially harmful effect of heat generation into a benefit by using lower wattage LEDs that inherently produce less heat. The curved lens design compensates for the lower power by optimizing light extraction efficiency, achieving the same or better brightness output without the thermal management problems. This approach transforms the limitation of low-power LEDs into an advantage by eliminating the need for complex heat dissipation systems
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 improves light emission efficiency to 80% and achieves uniform light distribution, enabling the use of lower wattage LEDs and reducing production costs by 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
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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.