Diffusing Plate Structure for Backlight Brightness Uniformity
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Solution Overview
Problem
Conventional backlight modules with LED light sources experience uneven brightness distribution due to interference between adjacent LEDs, which existing diffusion structures partially fail to address, leading to asymmetrical brightness distribution.
Innovation Solution
A diffusing plate structure with rotational symmetry, featuring unit blocks containing first and second micro diffusing structures, where the density and area of transparent and opaque regions are adjusted based on a predetermined threshold to optimize light distribution, allowing for automatic design and fabrication to enhance brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED matrix light sources are used in backlight modules, then the structure is simple and energy consumption is low, but the brightness distribution becomes uneven due to interference between adjacent LEDs
Solution Approach 1:
The optical film is divided into multiple units, each corresponding to an LED light source. Each unit contains a light diffusing structure with transparent and opaque areas that are independently configured to control light distribution from each LED, enabling localized brightness adjustment to achieve overall uniformity.
Solution Approach 2:
The light diffusing structure within each unit has non-uniform transparency distribution. The transparent areas allow more light passage while opaque areas block and redirect light, creating local variations in light diffusion that compensate for the interference patterns between adjacent LEDs and achieve uniform overall brightness.
2Illumination intensity
If more optical films are added to ensure even brightness distribution, then brightness uniformity improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple optical functions (light diffusion, reflection, and brightness uniformity control) are merged into a single integrated optical film structure. The light diffusing structures with combined transparent and opaque areas perform multiple functions simultaneously, eliminating the need for multiple separate optical films and simplifying manufacturing.
3Illumination intensity
If light diffusing structures are added to the optical film, then brightness uniformity improves, but the manufacturing precision requirements increase
Solution Approach 1:
The light diffusing structures are designed as discrete elements with clear boundaries between transparent and opaque areas. This extraction of distinct functional zones simplifies the manufacturing process by providing well-defined patterns that are easier to produce with standard fabrication techniques compared to continuous gradient structures.
4Device complexity
If conventional diffusion plates are used, then the structure is simple, but the brightness distribution remains asymmetrical relative to adjacent LEDs
Solution Approach 1:
The light diffusing structures are designed with asymmetric transparent and opaque area distributions within each unit. This intentional asymmetry compensates for the symmetric interference pattern between adjacent LEDs, creating a net symmetric brightness distribution across the display area.
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 diffusing plate structure effectively remixes and reflects light rays, providing improved brightness uniformity and adjustability, addressing the issue of uneven brightness distribution in backlight modules by dynamically adjusting the density and arrangement of micro diffusing structures according to initial and target brightness distributions.
Implementation Method 1
a first opaque area for reflecting and diffusing light, the first opaque area surrounds the first transparent area, the second micro diffusing structure includes a second transparent area for transmitting light and a second opaque area for reflecting and diffusing light
Implementation Method 2
The diffusing plate structure effectively remixes and reflects light rays, providing improved brightness uniformity
Data Source
AI summary
The invention relates to a diffusing plate structure and a backlight module. The diffusing plate structure is corresponding to a light source and comprises an incidence surface, an emergence surface, a side surface, and a light diffusing structure. The incidence surface is opposite to the emergence surface. The light diffusing structure is disposed on at least one of the incidence surface and the emergence surface, and includes a plurality of unit blocks distributed evenly. Every unit block includes a first micro diffusing structure or a second micro diffusing structure. The first micro diffusing structure includes a first transparent area for transmitting light and a first opaque area for reflecting and diffusing light. The first opaque area surrounds the first transparent area. The second micro diffusing structure includes a second transparent area for transmitting light and a second opaque area for reflecting and diffusing light. The second transparent area surrounds the second opaque area.