Double-Sided LCD Illuminator Grouping for Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Double-sided liquid crystal displays face challenges in reducing power consumption and achieving a thin form factor due to the need for constant illumination of all backlight modules, even when only one panel is in use.
Innovation Solution
A double-sided liquid crystal display design that includes a light guide plate with two light emitting surfaces and a system of point or linear illuminators, where only the necessary illuminators are activated based on the display configuration, with a Hall-effect switch controlling the illuminators to optimize power usage and light distribution between the primary and secondary panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all illuminators are activated to provide light beams for both liquid crystal panels, then both panels can display, but power consumption increases significantly
Solution Approach 1:
The backlight module is divided into multiple independent illuminators (first illuminator and second illuminator) that can be controlled separately. The control circuit selectively activates only the illuminator corresponding to the panel that needs to display, thereby reducing power consumption while maintaining display functionality.
2Length of stationary object
If a single backlight module serves both panels, then device thickness is reduced, but light distribution cannot be optimized for different panel sizes
Solution Approach 1:
Different illuminators are positioned at different locations relative to the light guide plate to provide optimized light distribution for each panel. The first illuminator is positioned for the first liquid crystal panel while the second illuminator is positioned for the second liquid crystal panel, allowing each panel to receive appropriate light intensity and distribution.
3Illumination intensity
If multiple illuminators are used to serve different panels, then light distribution can be optimized, but device complexity increases
Solution Approach 1:
Multiple illuminators are integrated into a single backlight module that also contains a light guide plate and control circuit. This merged structure allows the system to provide optimized light distribution to different panels while managing complexity through unified design and control.
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 design reduces power consumption by selectively illuminating panels based on their usage status, extending the life of the illuminators and improving light utilization, thereby addressing the issues of power waste and thickness in existing double-sided LCDs.
Implementation Method 1
a light guide plate, a plurality of illuminators, a first liquid crystal panel and a second liquid crystal panel. The light guide plate includes a first light emitting surface and a second light emitting surface
Implementation Method 2
with a Hall-effect switch controlling the illuminators to optimize power usage and light distribution
Data Source
AI summary
An exemplary double-sided liquid crystal display includes a light guide plate, illuminators, a first liquid crystal panel, and a second liquid crystal panel. The light guide plate includes a first light emitting surface and a second light emitting surface. The first and second light emitting surfaces are configured for light emission. The illuminators are configured for providing light beams for the light guide plate. The first liquid crystal panel is configured for receiving the light beams from the first light emitting surface. The second liquid crystal panel is configured for receiving the light beams from the second light emitting surface. When the first liquid crystal panel is configured to display, the first liquid crystal panel is illuminated by only part of the illuminators. When the second liquid crystal panel is configured to display, the second liquid crystal panel is illuminated by all the illuminators.