Backlight Module Adhesive Design for Thin LCD
Solution Overview
Problem
Conventional backlight modules for liquid crystal displays are hindered in thinness and lightweight design due to the thickness of the reflecting film and the double-faced adhesive tapes used to secure the light guide and reflecting films to the back plate, which increases the overall module thickness.
Innovation Solution
A backlight module design that incorporates a reflecting film with openings to receive adhesive members, allowing the light guide plate to be adhered directly to the back plate through these members, reducing the need for additional thickness and enabling a thinner module structure, while also using position-limiting structures to ensure proper alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If double faced adhesive tapes are used to secure the reflecting film and light guide plate to the back plate, then the components can be firmly attached, but the overall thickness of the backlight module increases
Solution Approach 1:
The patent combines the attachment function for both the reflecting film and light guide plate into a single adhesive tape layer. The adhesive tape is positioned between the back plate and the reflecting film, and extends to adhere to the light guide plate as well, eliminating the need for separate adhesive layers for each component and thereby reducing overall thickness while maintaining attachment strength.
Solution Approach 2:
The adhesive tape is designed to extend in multiple directions from its primary position between the back plate and reflecting film. It adheres to the light guide plate at angles and positions that utilize spatial extension rather than requiring additional thickness in the vertical dimension, allowing multi-component attachment without increasing module thickness.
2Reliability
If the reflecting film has thickness, then it can provide adequate reflection function, but additional adhesive tape thickness is required to align components, increasing overall module thickness
Solution Approach 1:
The adhesive tape is pre-positioned between the back plate and the reflecting film before the light guide plate is attached. This preliminary positioning establishes a reference plane that accommodates the reflecting film's thickness and enables direct alignment of the light guide plate to the back plate through the same adhesive tape, eliminating the need for additional alignment thickness.
3Manufacturing precision
If multiple adhesive tapes are used to secure components, then proper alignment can be achieved, but the structure becomes more complex and thicker
Solution Approach 1:
The single adhesive tape serves multiple functions simultaneously: it attaches the reflecting film to the back plate, provides alignment reference for the light guide plate, and directly adheres to the light guide plate. This multi-functional design eliminates the need for separate adhesive tapes for each component, reducing structural complexity while maintaining alignment precision.
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 reduces the overall thickness of the backlight module without compromising its functionality, allowing for a more compact and stable assembly of the light guide and reflecting films, aligning with the trend of portable electronic products towards thinness and lightweight.
Implementation Method 1
The adhesive member is disposed on the back plate. A reflecting film is engaged with the adhesive member and is positioned on the back plate. The light guide plate is disposed on the reflecting film, and a portion of the light guide plate is adhered to the back plate by the adhesive member.
Data Source
AI summary
A backlight module and a liquid crystal display are provided. The backlight module includes a back plate, at least one adhesive member, a reflecting film, a light guide plate and a light source. The adhesive member is disposed on the back plate. A reflecting film is engaged with the adhesive member and is positioned on the back plate. The light guide plate is disposed on the reflecting film, in which a portion of the light guide plate is adhered to the back plate by the adhesive member. The light source is disposed on the back plate for emitting light towards a light-incident surface of the light guide plate.