Backlight Module Dot Printing on Protective Layer
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Solution Overview
Problem
The existing backlight modules are thick due to the need for a diffuser plate with printed dots, and the alignment of these dots is cumbersome, leading to uneven brightness and difficulty in achieving consistent thickness of protective glue, which affects light distribution.
Innovation Solution
The solution involves directly printing dots on the protective layer of the light board, omitting the diffuser plate, which allows for reduced thickness and improved alignment, ensuring consistent light distribution by covering light-emitting elements with dots of specific sizes and arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dots are printed on the diffuser plate to reduce light intensity directly above the LED, then uniform brightness is achieved, but the thickness of the backlight module increases
Solution Approach 1:
The patent extracts the dot printing function from the diffuser plate and relocates it to the protective glue layer. This allows the diffuser plate to be removed or thinned, thereby reducing the overall thickness of the backlight module while maintaining the light uniformity function through the printed dots on the protective glue layer.
Solution Approach 2:
The patent changes the dimensional location of the dots from being on the diffuser plate surface to being embedded within the protective glue layer. This dimensional relocation allows the dots to perform their light-modifying function without adding the full thickness of a separate diffuser plate structure.
2Length of stationary object
If the protective glue is thinned to achieve thinner products, then the overall thickness is reduced, but the consistency of glue thickness becomes difficult to control, resulting in uneven light distribution
Solution Approach 1:
The patent introduces printed dots on the protective glue layer as an intermediary element that compensates for variations in glue thickness. These dots modify the light path and intensity distribution, effectively masking the effects of inconsistent glue thickness and maintaining uniform light output across the display.
3Illumination intensity
If dots are printed on the diffuser plate, then light intensity is reduced directly above LEDs, but the alignment process becomes cumbersome and prone to deviation
Solution Approach 1:
The patent merges the dot printing process with the protective glue application process. By printing dots directly on the protective glue layer during its formation, the separate alignment step between dots and LEDs is eliminated, significantly simplifying the manufacturing process and reducing alignment errors.
Solution Approach 2:
The patent performs the dot printing action preliminarily, during the protective glue application stage, before the final assembly is complete. This preliminary placement of dots ensures they are positioned correctly relative to the LEDs without requiring subsequent complex alignment operations.
Data Source
AI summary
The present disclosure provides a backlight module, including a substrate, a plurality of light-emitting elements, a protective layer and a plurality of first dots. These light-emitting elements are disposed on the substrate. The protective layer is disposed on the substrate and the light-emitting elements, the protective layer has an upper surface and a lower surface opposite to the upper surface, and the upper surface of the protective layer is flat. The first dots are disposed on the upper surface of the protective layer and cover the light-emitting elements. A vertical projection area of each of the first dots on the substrate is larger than a vertical projection area of each of the light-emitting elements on the substrate, so as to reduce the thickness of the backlight module and reduce the dots alignment process.