Mini LED Backlight Module Splicing Seam Light Compensation
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Solution Overview
Problem
Large-size display screens using Mini LED backlight modules face issues with dark shadows or dark lines at splicing seams due to uneven light emission, as the light emission angles of elements on the chamfer differ from those on the top surface, affecting the overall light emitting quality.
Innovation Solution
The backlight module design includes a splicing seam between light boards with a top surface and a second surface connected to it, where first and second light-emitting elements are arranged along the seam, and the central light-emitting directions of the second elements incline towards the seam to compensate for light at the seam, improving optical field balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light-emitting elements are arranged on the chamfer to reduce dark shadows at splicing seams, then the dark shadows are reduced, but the light emission angle becomes greatly different from elements on the top surface, resulting in uneven light emission
Solution Approach 1:
The patent divides the light-emitting elements into two groups with different properties: first light-emitting elements on the top surface with a first light emission angle, and second light-emitting elements on the chamfer with a second light emission angle. Each group is optimized for its specific location to achieve overall uniformity.
Solution Approach 2:
The patent changes the light emission angle parameter for different groups of light-emitting elements. The first light-emitting elements have a first light emission angle, while the second light-emitting elements have a second light emission angle that is different from the first, allowing optimization for their respective positions.
2Area of stationary object
If multiple light boards are spliced to form large-size display screens, then the display size is increased, but splicing seams are formed causing dark shadows and affecting light emitting quality
Solution Approach 1:
The patent divides the large display screen into multiple light boards that are spliced together. Each light board contains both first light-emitting elements on the top surface and second light-emitting elements on the chamfer, allowing the system to achieve large size while maintaining uniform light emission at splicing seams.
3Device complexity
If light-emitting elements are arranged only on the top surface, then the structure is simple, but dark shadows appear at splicing seams due to insufficient light compensation
Solution Approach 1:
The patent adds second light-emitting elements specifically on the chamfer where dark shadows occur, while keeping the first light-emitting elements on the top surface. This localized addition compensates for light deficiency at splicing seams without overly complicating the overall structure.
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 the light emitting quality by uniformly distributing light across the splicing seam, reducing dark shadows and improving image display effects without adding extra elements or structures, thus simplifying the module's structure and maintaining optical field balance.
Implementation Method 1
Light Emitting Diode (LED) light boards, especially submillimeter light emitting diode (Mini LED) light boards, are the mainstream light source modes in the display industry.
Data Source
AI summary
A backlight module includes a plurality of light boards spliced with each other. A splicing seam is defined between adjacent light boards. Each of the light boards includes a top surface including a first surface and a second surface connected to the first surface and disposed on a side of the first surface close to the splicing seam. A plurality of columns of first light-emitting elements are disposed on the first surface. A plurality of second light-emitting elements are disposed on the second surface. At least two columns of the plurality of second light-emitting elements are disposed on the second surface along a direction close to the splicing seam. The first light-emitting elements per column or the second light-emitting elements per column are arranged along an extending direction of the splicing seam. Central light-emitting directions of the second light-emitting elements incline in a direction towards the splicing seam.