Backlight Module Reflection Ratio for Luminance Uniformity
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Solution Overview
Problem
Backlight modules using LEDs face challenges in achieving uniform luminance due to differences in LED brightness, leading to increased costs and inefficiencies in using LEDs of varying brightness.
Innovation Solution
A backlight module design that includes a circuit board with first and second LED devices of different brightness, along with a reflection device featuring distinct reflection regions and openings, where the reflection ratio is adjusted to balance light intensity, and an optical film set for further uniformity, ensuring that brighter LEDs receive less reflected light and darker LEDs receive more, thereby reducing brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If LEDs of different brightness are used in the backlight module, then cost is reduced, but luminance uniformity deteriorates
Solution Approach 1:
The reflection device is designed with different reflection ratios in different regions. Specifically, the reflection ratio in the first region (corresponding to brighter LEDs) is lower than in the second region (corresponding to darker LEDs). This local differentiation allows the system to use LEDs of different brightness while maintaining uniform luminance output across the display panel.
2Illumination intensity
If LEDs are ranked and selected by brightness before welding, then luminance uniformity is improved, but cost increases
Solution Approach 1:
Instead of selecting LEDs based on brightness uniformity, the invention changes the parameter being controlled to the reflection ratio of the reflection device. By adjusting the reflection ratio according to the brightness characteristics of different LED regions, the system achieves luminance uniformity without needing to select and rank LEDs during the manufacturing process.
3Device complexity
If a uniform reflection ratio is used across the circuit board, then device complexity is reduced, but luminance uniformity deteriorates
Solution Approach 1:
The reflection device is segmented into multiple regions with different reflection ratios. The segmentation is based on the brightness distribution of LEDs on the circuit board, dividing them into at least two groups (first and second regions) that require different reflection characteristics. This segmentation approach maintains relatively simple device structure while achieving the desired 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
This design enhances luminance uniformity and improves display quality by optimizing the reflection of light from LEDs of varying brightness, reducing costs associated with purchasing LEDs of similar brightness.
Implementation Method 1
The reflection device has at least one first reflection region and at least one second reflection region, wherein the first reflection region is disposed around the first LED device, the second reflection region is disposed around the second LED device, and the reflection ratio of the first reflection region opposite to a light-emitting energy of the first LED device is smaller than that of the second reflection region opposite to a light-emitting energy of the second LED device.
Data Source
AI summary
A backlight module including a circuit board, at least one first light emitting diode (LED) device, at least one second LED device, and a reflection device is provided. The first and second LED devices are disposed on a carrying surface of the circuit board and electrically connected to the circuit board. The brightness of the first LED device is greater than that of the second LED device. The reflection device is disposed on the circuit board and exposes the first and second LED devices. The reflection device has at least one first reflection region disposed around the first LED device and at least one second reflection region disposed around the second LED device. The reflection ratio of the first reflection region opposite to the light-emitting energy of the first LED device is smaller than that of the second reflection region opposite to the light-emitting energy of the second LED device.