LCD Display Module Direct Bonding for Mechanical Robustness
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Solution Overview
Problem
Display modules are vulnerable to mechanical stress, leading to cracking or breaking of the rear substrate and potential separation of components, particularly due to the bending of connecting foils, which can cause the rear polarizer to peel off, and existing solutions like upper bezels increase thickness and cost.
Innovation Solution
Direct bonding between the rear substrate of the LCD panel and the lightguide using a double-sided adhesive foil, eliminating the need for a rear polarizer bond and reducing thickness, while a smaller rear polarizer covers only the active region, and the adhesive foil provides mechanical strength and shock absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate black sticker is placed below the driver IC to block light, then light blocking is achieved, but the mechanical robustness is reduced and components are vulnerable to stress
Solution Approach 1:
The patent combines the light blocking function and structural support function into a single integrated component - the black adhesive layer. This layer is positioned between the lightguide and the driver IC, serving both to block light from reaching the driver IC and to provide mechanical support to prevent the rear substrate from cracking under stress, thereby resolving the contradiction between light blocking and mechanical robustness
2Stability of the object's composition
If an upper bezel is provided to prevent peeling of the rear polarizer, then component stability is improved, but the thickness of the display module increases
Solution Approach 1:
The patent merges the protective function previously requiring a separate upper bezel into the black adhesive layer itself. This adhesive layer is positioned to extend across the rear substrate and bond the rear polarizer, lightguide, and driver IC together, providing both light blocking and structural stabilization without adding the thickness of a separate bezel component
3Ease of manufacture
If the connecting foil is bent backwards to connect to the driver IC, then electrical connection is achieved, but mechanical stress causes cracking of the rear substrate and liquid crystal leakage
Solution Approach 1:
The patent implements beforehand cushioning by positioning the black adhesive layer between the lightguide and the driver IC mounting area. This adhesive layer acts as a cushioning element that absorbs and distributes the mechanical stress generated when the connecting foil is bent backwards, preventing the stress from concentrating on the rear substrate and causing cracks that would lead to liquid crystal leakage
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
Enhances mechanical robustness, prevents component disintegration, reduces manufacturing costs, and maintains a slim profile by eliminating the need for an upper bezel and minimizing stress on intermediate layers during shocks.
Implementation Method 1
Direct bonding between the rear substrate of the LCD panel and the lightguide using a double-sided adhesive foil
Data Source
AI summary
A display module (100) comprises an LCD panel (110), which comprises a front substrate (114) and a rear substrate (116) opposed to the front substrate (114), a liquid crystal material sealed between the front substrate (114) and the rear substrate (116), a front polarizer (112) associated with the front substrate (114) and a rear polarizer (118) associated with the rear substrate (116). The components of the LCD panel are bonded together. The display module (100) further comprises a lightguide (130) having a first surface (131) facing the rear polarizer (118) and a second surface (132) opposed to the first surface (131). At least a part of the first surface (131) of the lightguide (130) is bonded directly to the rear substrate (116) of the LCD panel (110).