Dual LCD Light Guide with Dot Patterns and Taper-Cascade Grooves
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Solution Overview
Problem
Conventional dual liquid crystal display devices are thick, heavy, and consume high power due to the need for separate backlights for main and sub panels, which is not suitable for slim and cost-efficient portable devices.
Innovation Solution
A dual liquid crystal display device is designed with a first transmissive panel and a second reflective panel formed on the same substrate, utilizing a light guide with dot patterns and taper-cascade grooves to control brightness uniformity and light efficiency, and a shared housing to reduce thickness and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If separate backlights are installed for main and sub liquid crystal display panels, then each panel can be properly illuminated, but the device becomes thick, heavy, and consumes high power
Solution Approach 1:
The patent merges the backlighting function into a single shared unit that serves both the main transmissive panel and the sub reflective panel. Instead of installing separate backlight assemblies for each panel, one integrated backlight unit provides illumination to both displays, thereby reducing overall device weight while maintaining proper illumination intensity for both panels
Solution Approach 2:
The backlight unit is designed with multi-functionality to serve dual purposes: it illuminates both the main transmissive display panel and the sub reflective display panel simultaneously. This universal lighting solution eliminates the need for separate backlight systems, reducing weight while ensuring adequate light supply to both display surfaces
2Illumination intensity
If separate backlights are installed for main and sub liquid crystal display panels, then each panel can be properly illuminated, but the device thickness increases
Solution Approach 1:
The patent combines the backlighting function into a single integrated unit positioned to illuminate both the main and sub panels. This merging approach eliminates the need for two separate backlight assemblies stacked behind each panel, thereby reducing device thickness while maintaining adequate illumination for both displays
Solution Approach 2:
The patent repositions the backlight unit in a shared space that serves both panels, utilizing the vertical arrangement and light reflection principles. By placing the backlight unit in a common location and using the reflective properties of the sub panel, the design achieves proper illumination without increasing device thickness
3Illumination intensity
If separate backlights are installed for main and sub liquid crystal display panels, then each panel can be properly illuminated, but power consumption increases
Solution Approach 1:
The patent merges the backlighting function into one shared unit that illuminates both the main transmissive panel and the sub reflective panel. This consolidation reduces power consumption because a single backlight unit consumes less energy than two separate units would require, while still providing sufficient illumination intensity to both display panels
Solution Approach 2:
The backlight unit is designed with multi-functionality to serve both display panels simultaneously, making the lighting system more energy-efficient. By using one universal light source instead of two separate ones, the overall power consumption is reduced while maintaining adequate brightness for both the main and sub displays
4Adaptability or versatility
If conventional dual panel structure is used, then both main and sub displays can be implemented, but manufacturing cost increases
Solution Approach 1:
The patent merges the backlighting subsystem into a single shared component that serves both display panels. This consolidation reduces the total number of parts that need to be manufactured, assembled, and tested, thereby lowering manufacturing costs while maintaining full dual-display functionality
Solution Approach 2:
The backlight unit is designed as a universal component capable of illuminating both the main and sub panels through different optical paths. This multi-functional design simplifies the manufacturing process by reducing component variety and assembly complexity, leading to cost-effective production while preserving adaptability for dual display operations
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
The solution results in a slim, cost-efficient dual liquid crystal display device with improved brightness uniformity and light efficiency, achieving the same thickness as single structure devices while reducing material and processing costs.
Implementation Method 1
a light guide disposed under the first and second liquid crystal display panels and including a first light guide block corresponding to the first liquid crystal display panel and having dot patterns formed on a first surface thereof and a second light guide block corresponding to the second liquid crystal display panel and having taper-cascade grooves formed on a first surface thereof
Data Source
AI summary
A dual liquid crystal display (LCD) device including a first LCD panel displaying an image on a first surface; a second LCD panel formed on the same substrate to display an image on a second surface; a light source disposed at an adjacent side under the first LCD panel; a light guide disposed under the first and second LCD panels and including a first light guide block corresponding to the first LCD panel and having dot patterns formed in a first surface and a second light guide block corresponding to the second LCD panel and having taper-cascade grooves formed on a first surface; and a housing settling the first and second LCD panels, the light source and the light guide and having an opening to correspond to an image display surface of the second LCD panel.