Backlight Source Mixed Luminescence Devices Brightness Uniformity
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Solution Overview
Problem
Conventional backlight modules for LCDs suffer from non-uniform brightness due to the Lambertian luminescence type of LEDs, leading to dark bands and reduced image quality, especially as they are miniaturized.
Innovation Solution
Incorporating at least two different types of electroluminescence devices with complementary luminescence types, such as side light and upward light types, and adjusting their arrangement positions and spacing to enhance brightness uniformity, while reducing the overall thickness of the backlight module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional Lambertian luminescence type LEDs are used in direct type backlight modules, then the structure is simple and manufacturing is easy, but the brightness uniformity deteriorates and dark bands appear
Solution Approach 1:
The invention segments the backlight module into multiple light emitting regions with different luminescence types (upward light type and side light type). By dividing the backlight source into distinct functional zones, each region contributes differently to the overall light distribution, thereby improving brightness uniformity while maintaining manufacturing simplicity
Solution Approach 2:
The invention applies different luminescence types to different local regions of the backlight module. Specifically, upward light type LEDs are positioned in certain areas while side light type LEDs are positioned in other areas, allowing each region to have optimized light emission characteristics for its specific function, thus eliminating dark bands and improving overall brightness uniformity
2Length of stationary object
If the overall thickness of backlight module is reduced, then the device becomes more compact and modern, but the brightness uniformity deteriorates and dark bands appear
Solution Approach 1:
The invention introduces side light type luminescence as an additional dimensional approach to light emission, complementing the conventional upward light type. This multi-dimensional light emission strategy allows the backlight module to achieve uniform brightness distribution even with reduced thickness, as the side light type LEDs provide lateral illumination that compensates for the reduced vertical light path
3Device complexity
If LEDs are arranged in array type configuration with same light type, then the arrangement is simple and manufacturing is easy, but the brightness uniformity deteriorates due to luminescence type influence
Solution Approach 1:
The invention implements local quality by assigning different luminescence types to different spatial positions within the LED array. Instead of using uniform upward light type LEDs throughout, the patent strategically places side light type LEDs in specific regions where they can complement the upward light emission, creating a heterogeneous array that achieves superior brightness uniformity
Solution Approach 2:
The LED array is segmented into multiple functional groups based on luminescence type. The invention divides the array into regions with upward light type LEDs and regions with side light type LEDs, allowing each segment to contribute differently to the overall light distribution pattern, thereby eliminating the dark band effect while maintaining relatively simple array configuration
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 solution achieves significantly improved brightness uniformity by distributing bright regions over dark areas, resulting in a smoother luminous intensity distribution and enhanced image quality without the dark band phenomenon.
Implementation Method 1
The first electroluminescence device generates light with a first luminescence type. The second electroluminescence devices are disposed around the first electroluminescence device, and the second electroluminescence devices generate light with a second luminescence type.
Data Source
AI summary
A backlight source has different luminescence types of electroluminescence devices and coordinates at least one of the arrangement positions and the arrangement spacing of the electroluminescence devices to improve the brightness uniformity of the backlight source and make the mixed light better. Moreover, because of the brightness uniformity promotion, the overall thickness of backlight module can be reduced.