Liquid Crystal Display Bonding Layer Segmentation
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Solution Overview
Problem
Conventional liquid crystal display devices with overlapping display panels require applying a bonding agent over entire surfaces, leading to increased costs.
Innovation Solution
A liquid crystal display device configuration where a bonding layer is strategically placed between the polarizing plates, overlapping their outer peripheral ends, reducing the need for extensive surface coverage and allowing for a thinner or absent bonding layer in certain areas, such as between the polarizing plates, to minimize material usage and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bonding agent is applied onto whole surfaces of the two display panels, then the panels are securely bonded, but the cost increases
Solution Approach 1:
The bonding agent application area is segmented into two distinct regions: a first region where the bonding agent is applied to bond the first glass substrate to the first polarizing plate, and a second region where the bonding agent is applied to bond the second polarizing plate to the third glass substrate. This segmentation allows the bonding agent to be applied only where needed rather than covering the entire surface.
Solution Approach 2:
The bonding agent is applied locally to specific regions rather than uniformly across the entire surface. The first region and second region are specifically identified as the locations requiring bonding, while other areas remain unbonded. This local quality approach reduces material usage while maintaining bonding strength at critical interfaces.
2Quantity of substance
If a bonding layer is disposed between the first glass substrate and the third glass substrate, then material usage is reduced, but the bonding between polarizing plates may be insufficient
Solution Approach 1:
The bonding structure is segmented into multiple bonding interfaces: the first bonding interface between the first glass substrate and first polarizing plate, and the second bonding interface between the second polarizing plate and third glass substrate. This segmentation ensures that bonding occurs at each critical interface rather than relying on a single bonding layer, maintaining reliability while reducing overall material usage.
Solution Approach 2:
The first polarizing plate and second polarizing plate serve as intermediary bonding elements between the glass substrates. Instead of directly bonding the glass substrates together with a thick bonding layer, the polarizing plates act as intermediaries that facilitate bonding at thinner, more controlled interfaces, reducing material usage while maintaining bonding reliability.
3Strength
If the bonding layer thickness is increased, then adhesive strength is improved, but the overall device thickness increases
Solution Approach 1:
The bonding function is segmented across multiple thin interfaces rather than concentrated in a single thick bonding layer. The first bonding interface and second bonding interface each use minimal bonding agent thickness, achieving the required adhesive strength through the cumulative effect of multiple bonding surfaces while keeping the overall device thickness minimal.
Solution Approach 2:
The bonding approach transitions from a single-dimension thick bonding layer to a multi-dimensional distributed bonding structure. By spreading the bonding function across multiple interfaces in different spatial dimensions (between glass substrate-polarizing plate pairs), the system achieves sufficient adhesive strength without increasing the overall thickness in any single dimension.
Data Source
AI summary
A liquid crystal display device includes a first glass substrate, a second glass substrate, a first liquid crystal layer disposed between the first glass substrate and the second glass substrate, a third glass substrate, a fourth glass substrate, a second liquid crystal layer disposed between the third glass substrate and the fourth glass substrate, a first polarizing plate formed on the first glass substrate, a second polarizing plate formed on the third glass substrate, and a bonding layer disposed between the first glass substrate and the third glass substrate. In planar view, the bonding layer is disposed outside the first polarizing plate and the second polarizing plate, a surface on the bonding layer bonds to the first glass substrate, and a surface on the bonding layer bonds to the third glass substrate.