Patterned Adhesive Layer for Backlight Module Attachment
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Solution Overview
Problem
Existing display devices face challenges in attaching backlight modules due to difficulties with adhesive tape, such as cutting narrow pieces and poor attachment yield, which hinder automated production and narrow bezel applications.
Innovation Solution
A display device with a backlight module comprising a back plate, a patterned adhesive layer, a light emitting module, and a reflector, where the adhesive layer is divided into areas to facilitate precise placement and attachment of components, allowing for improved alignment and binding, and a method involving steps to apply and cure the adhesive layers for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adhesive tape is used to attach backlight module components, then attachment is achieved, but cutting narrow pieces narrower than 0.5 mm is difficult and attachment yield is poor
Solution Approach 1:
The adhesive layer is divided into a first area and a second area with different properties. The first area provides strong adhesion for the light emitting module, while the second area provides release functionality for easy removal of excess adhesive and components. This segmentation resolves the contradiction by enabling precise attachment in the first area while facilitating easy manufacture through the release function of the second area.
Solution Approach 2:
The patterned adhesive layer acts as an intermediary between the back plate and the components (light emitting module and reflector). It provides controlled adhesion where needed while allowing easy release where not needed, solving the problem of difficult cutting and poor attachment yield by mediating the bonding process through its patterned structure with different adhesive properties in different areas.
2Reliability
If adhesive tape is used for attachment, then components can be bound, but automated production of backlight modules is hindered
Solution Approach 1:
The patterned adhesive layer is prepared in advance on the back plate with distinct first and second areas before component assembly. This preliminary action enables automated production by pre-defining attachment zones and release zones, allowing robotic systems to place components accurately on the first area while the second area automatically facilitates excess adhesive removal without manual intervention.
Solution Approach 2:
The patterned adhesive layer serves as an intermediary that enables automated production by providing built-in alignment features and controlled release properties. The distinct first and second areas guide automated assembly equipment in placing components correctly while automatically managing adhesive excess, thereby improving both attachment reliability and automated production capability.
3Length of stationary object
If adhesive tape is used, then attachment is achieved, but narrow bezel design is compromised
Solution Approach 1:
The adhesive layer exhibits local quality with different properties in different areas. The first area has strong adhesion for secure component attachment, while the second area has release properties for easy cleanup. This local differentiation enables narrow bezel design by allowing precise adhesive application only where needed, eliminating the need for wide bezels to accommodate adhesive tape margins and enabling tighter component spacing.
Data Source
AI summary
A display device and a method for preparing the same are disclosed. The display device includes a display panel and a backlight module. The backlight module is located below the display panel and includes a back plate, a first adhesive layer, a light emitting module and a reflector. The first adhesive layer is disposed on the back plate and the first adhesive layer includes a first area and a second area. The first area is adjacent to the second area. The light emitting module includes a light emitting unit and a print circuit board. The light emitting unit and the print circuit board are electrically connected, and the print circuit board is disposed in the first area of the first adhesive layer. A part of the reflector is disposed in the second area of the first adhesive layer.