Display Module Optical Adhesion and Light Extraction Film Design
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Solution Overview
Problem
Existing display module designs face limitations in reducing thickness due to the presence of intervening structures such as air layers, reflector plates, and optical films, which complicate the module structure and hinder further miniaturization.
Innovation Solution
A display module design featuring a light guide plate and a light extraction film with micro-convex structures, where the light guide plate is adhered to the light extraction film using a second optical adhesive layer, and the display panel is adhered to the light extraction film using a first optical adhesive layer, allowing for full adhesion and eliminating the need for additional structures like reflector plates and air layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If reflector plate and back-plate PET layer are added to bond onto light guide plate, then structural stability is improved, but module thickness increases
Solution Approach 1:
The patent combines multiple functions into the light extraction film: it serves as both the light extraction component and the structural support layer that replaces the traditional reflector plate and back-plate PET layer. The film is directly bonded to the light guide plate, merging what were previously separate components into a single integrated structure, thereby reducing thickness while maintaining stability
Solution Approach 2:
The light extraction film performs multiple functions simultaneously: it extracts light from the light guide plate, provides structural support, and eliminates the need for separate reflector plate and decoration layer. This multi-functionality allows the module to achieve structural stability without adding the traditional thickening components
2Use of energy by moving object
If air layer and intervening structures are introduced between light guide plate and display panel, then light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the air layer and intervening structures from the traditional module design. By removing these components, the design achieves full adhesion between the light guide plate and display panel, simplifying the structure while the light extraction film itself handles the light extraction function through its micro-convex structures
Solution Approach 2:
The light extraction film acts as an intermediary component with micro-convex structures that enable direct contact between the light guide plate and display panel. These micro-convex structures create air pockets or refractive index differences at the interface, facilitating light extraction without requiring a separate air layer, thus simplifying the overall structure
3Manufacturing precision
If multiple separate components (reflector plate, optical films, air layers) are used, then light orientation control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges the light orientation control function into the light extraction film's micro-convex structures, eliminating the need for separate optical films and reflector plates. This integration reduces the number of components that require precise alignment and assembly, thereby reducing manufacturing precision requirements while maintaining light orientation control
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 simplifies the module structure, reduces thickness, and ensures efficient light extraction and orientation, making it possible to determine the module thickness primarily by the display panel and light guide plate, while maintaining clear and uniform light transmission.
Implementation Method 1
a first optical adhesive layer located between the backlight module and the display panel. The display panel and the backlight module are adhered to each other through the first optical adhesive layer
Implementation Method 2
The light guide plate is adhered onto the light incident side of the light extraction film through a second optical adhesive layer
Implementation Method 3
the light incident side of the light extraction film includes a plurality of transparent micro-convex structures configured to extract light from the light guide plate
Data Source
AI summary
A backlight module, a display module and a display device are disclosed. The display module includes a backlight module; a display panel located at a light exit side of the backlight module; and a first optical adhesive layer located between the backlight module and the display panel. The display panel and the backlight module are adhered to each other through the first optical adhesive layer.