Double-Sided LCD Optical Film Sizing for Cost Reduction
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Solution Overview
Problem
In double-sided liquid crystal displays, the second optical film assembly is often larger than needed due to the smaller size of the secondary liquid crystal panel, resulting in wasted resources and increased costs.
Innovation Solution
The second optical film assembly is sized to match the smaller area of the second liquid crystal panel, with optional reflective or diffusing films to enhance display uniformity and prevent bright lines, ensuring only the necessary components are used for functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second optical film assembly is sized to match the larger first liquid crystal panel, then the display structure is simplified and manufacturing is easier, but the optical film assembly area is excessive and costs increase
Solution Approach 1:
The patent applies local quality by making the second optical film assembly have a different size than the first optical film assembly, specifically matching the smaller second liquid crystal panel area. This allows each component to be optimized for its specific function rather than using a uniform size throughout, thereby reducing material waste while maintaining manufacturing feasibility.
Solution Approach 2:
The patent segments the optical film assemblies into two different sizes corresponding to the two different liquid crystal panels. Instead of using a single uniform optical film assembly for both displays, the system divides the optical films into a first optical film assembly for the main display and a second optical film assembly for the secondary display, optimizing material usage for each.
2Loss of substance
If the second optical film assembly is sized to match the smaller second liquid crystal panel, then material waste is reduced and costs decrease, but display uniformity may be compromised due to peripheral light interference
Solution Approach 1:
The patent introduces a reflective film as an intermediary component between the light guide plate and the second optical film assembly. This reflective film prevents peripheral light from the first display from interfering with the second display, thereby maintaining display uniformity even when the second optical film assembly is sized to match the smaller panel area.
Solution Approach 2:
The patent applies preliminary action by placing the reflective film in position before the light propagation occurs. The reflective film is pre-installed to block and redirect peripheral light paths, preventing potential display uniformity issues before they can occur during operation.
3Reliability
If a reflective film is added to prevent bright lines and improve uniformity, then display quality is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The reflective film serves multiple functions: it prevents peripheral light from the first display from interfering with the second display, blocks bright lines, and maintains display uniformity. By making this single component multi-functional, the patent improves display quality without proportionally increasing device complexity.
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 approach reduces costs by optimizing the size of the optical film assemblies and improves display uniformity by minimizing unused components and peripheral light interference.
Implementation Method 1
Other of the light beams are emitted from the first and second light emitting surfaces 131, 132 after being reflected one or more times in the light guide plate 130
Implementation Method 2
All light beams emitted from the first and second light emitting surfaces 131, 132 respectively transmit through the first and second optical film assemblies 111, 121 and through the first and second liquid crystal panels 112, 122
Data Source
AI summary
An exemplary double-sided liquid crystal display (LCD) (200) includes a first liquid crystal panel (212), a first optical film assembly (211), a light guide plate (230), a second optical film assembly (211), and a second liquid crystal panel (222) arranged in that order from bottom to top. An area of the second liquid crystal panel is less than an area of the first liquid crystal panel, and an area of the second optical film assembly is less than an area of the first optical film assembly. The second optical film assembly of the double-sided LCD has a size no larger than that needed to perform its function in respect of light beams propagating therethrough from the light guide plate to the second liquid crystal panel. Therefore, the double-sided LCD is cost-efficient.