Polarizing Plate Composite Films Impact Absorption
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Solution Overview
Problem
Conventional liquid crystal display devices require thick and heavy cover windows for impact absorption, leading to increased thickness, weight, and processing costs, along with complex bonding processes that incur additional costs and risks of failure.
Innovation Solution
A polarizing plate is designed with thin films of varying strengths, where a low-strength film serves as the outermost layer to absorb impact and a high-strength film beneath disperses and absorbs the impact, replacing the need for a thick cover window, thereby simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick cover window is used for impact absorption, then impact resistance is improved, but thickness and weight increase
Solution Approach 1:
The patent applies composite materials by combining a low-strength film (first film) and a high-strength film (second film) with different mechanical properties. The low-strength film absorbs impact energy through deformation, while the high-strength film provides structural support and disperses the impact force, achieving effective impact absorption with thinner and lighter construction compared to conventional single-material cover windows.
2Strength
If a thick cover window is used for impact absorption, then impact resistance is improved, but device thickness increases
Solution Approach 1:
The composite film structure enables effective impact absorption with reduced thickness by utilizing the synergistic effect of two films with different strength characteristics. The low-strength film deforms to absorb impact energy, while the high-strength film maintains structural integrity, allowing the overall assembly to be thinner than conventional single-material cover windows while maintaining or improving impact resistance.
Solution Approach 2:
The cover window function is segmented into two distinct films with different mechanical roles. The first film (low-strength) is specifically designed to deform and absorb impact energy, while the second film (high-strength) provides structural support. This functional segmentation allows each layer to be optimized for its specific purpose, achieving effective impact protection with reduced overall thickness.
3Strength
If a thick cover window is used for impact absorption, then impact resistance is improved, but processing cost increases
Solution Approach 1:
The patent replaces the conventional rigid glass cover window with flexible thin films that can be manufactured using roll-to-roll lamination processes. This approach eliminates the need for expensive chemical and physical tempering processes required for thin glass, while also avoiding the increased thickness (500 μm or larger) required for plastic materials to achieve equivalent strength, thereby reducing processing costs.
4Strength
If a cover window with bonding agent is used for impact absorption, then impact resistance is improved, but device complexity and process cost increase
Solution Approach 1:
The patent merges the cover window and bonding agent functions into a single integrated film assembly. The first and second films are laminated together to form a unified impact-absorbing structure that is directly attached to the display panel, eliminating the need for separate bonding agents and complex multi-step bonding processes such as resin applying, jig-based bonding, spreading, and multi-stage hardening processes.
Data Source
AI summary
A polarizing plate and a display device including the same of the present disclosure absorb and disperse an external impact by laminating thin films having different strengths. As described above, according to the present disclosure, instead of a thick cover window, a thin film is used so that thin thickness, light weight, and low cost of the polarizing plate may be achieved. Further, the manufacturing process is simplified and the processing cost is reduced.