Optical Assembly Protrusion Avoidance Slot Stabilization
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Solution Overview
Problem
Conventional backlight systems in smartphones face issues with side bright lines, mura (image defects), and film displacement due to the uneven thickness and alignment of diffusion, lower prism, and upper prism sheets, which affect the stability and performance of the display.
Innovation Solution
An optical assembly is designed with a diffusion sheet, a lower prism sheet, and an upper prism sheet stacked sequentially, where at least one edge of the diffusion sheet has an adhesive strip, and the lower prism sheet features protrusions forming an avoidance slot to secure the adhesive strip, preventing overlap and ensuring stability, while a light shielding tape adheres the adhesive strip, protrusions, and the upper prism sheet to maintain the sheets' positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive strip is added to fix the sheets, then stability is improved, but device complexity increases
Solution Approach 1:
The adhesive strip is integrated with the lower prism sheet by passing it through the avoidance slot, merging the fixing function into the existing structure rather than adding a separate complex fastening mechanism
Solution Approach 2:
The adhesive strip serves as an intermediary element that connects the lower prism sheet to the upper prism sheet and diffusion sheet, providing a simple yet effective fixing mechanism without requiring complex joints or fasteners
2Manufacturing precision
If protrusions are added to prevent overlap, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The protrusions are pre-formed on the lower prism sheet to define the avoidance slot position, ensuring correct alignment is established before assembly, which simplifies the manufacturing process rather than complicating it
Solution Approach 2:
The protrusions extend in the thickness direction of the lower prism sheet, utilizing the Z-dimension to create the avoidance slot, which prevents overlap in the XY plane without affecting the overall footprint or complexity of the assembly
3Reliability
If light shielding tape is added to adhere components, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The light shielding tape simultaneously adheres the adhesive strip, protrusions, and upper prism sheet in a single operation, combining multiple fixing functions into one manufacturing step that maintains ease of assembly while ensuring reliability
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 enhances the stability and prevents film displacement and light leakage during reliability tests, such as high temperature, high humidity, and transportation, by ensuring the sheets are fixed in place, thereby improving the overall performance and reliability of the display.
Implementation Method 1
an adhesive strip, a side surface of the lower prism sheet facing the adhesive strip is provided with at least one protrusion
Implementation Method 2
a side of the upper prism sheet distal to the diffusion sheet is provided with a light shielding tape
Data Source
AI summary
There are provided an optical assembly, a backlight and a display device. The optical assembly includes a diffusion sheet, a lower prism sheet and an upper prism sheet stacked sequentially, a surface of the diffusion sheet facing the lower prism sheet serves as a light exit surface, at least one edge of the light exit surface is provided with a adhesive strip, a side surface of the lower prism sheet facing the adhesive strip is provided with at least one protrusion, the side surface of the protrusion cooperates with the surface of the lower prism sheet facing the adhesive strip to form an avoidance slot; orthographic projections of the upper prism sheet and the adhesive strip on the light exit surface do not overlap with each other, orthographic projections of the upper prism sheet and the protrusion on the light exit surface do not overlap with each other.