Segmented Light Guiding Plate for Sub Screen Power Reduction
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Solution Overview
Problem
Smartphones with sub screens experience high power consumption due to all backlight sources being driven simultaneously, even when only displaying images on the sub screen, leading to inefficient energy use.
Innovation Solution
A liquid crystal display (LCD) device with a backlight unit featuring a light guiding plate that includes separate light-emission portions for the main and sub screens, allowing for individual control of light sources to minimize power consumption by turning off the main screen's light source when only the sub screen is in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If all backlight sources are driven simultaneously to ensure uniform illumination across the entire display, then illumination uniformity is improved, but power consumption increases
Solution Approach 1:
The backlight unit is divided into multiple independently controllable light emission portions corresponding to different display regions (main screen and sub screen). Each light emission portion can be selectively activated or deactivated based on display requirements, allowing the system to illuminate only the necessary areas rather than the entire display uniformly, thus reducing overall power consumption while maintaining adequate illumination where needed.
Solution Approach 2:
Different light emission portions are provided with different illumination characteristics and control mechanisms. The main screen receives light from a first light emission portion while the sub screen receives light from a second light emission portion, allowing each region to have optimized illumination quality independent of the other. This enables the system to provide high illumination uniformity on the active display region without unnecessarily illuminating inactive regions, resolving the contradiction between illumination quality and power consumption.
2Use of energy by moving object
If separate light emission portions are provided for main and sub screens to reduce power consumption, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The light guiding plate serves multiple functions: it guides light from the light source, divides light into different emission portions for main and sub screens, and provides optical coupling between the light source and display panel. By making the light guiding plate multi-functional rather than adding separate components for each function, the patent reduces device complexity while still achieving separate control of light emission portions for power consumption reduction.
Solution Approach 2:
The patent combines the light guiding functions and the light division functions into a single integrated light guiding plate structure. Rather than using separate components for guiding light and for dividing it into different emission portions, the light guiding plate performs both functions simultaneously, simplifying the overall backlight structure while maintaining the capability for selective illumination of main and sub screens.
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 solution reduces power consumption by selectively illuminating only the sub screen, preventing light leakage and improving luminance, thus enhancing energy efficiency and display quality.
Implementation Method 1
a light guiding plate for guiding light from a light source toward the liquid crystal display panel
Implementation Method 2
a light guiding plate for guiding light from a light source toward the liquid crystal display panel
Data Source
AI summary
Disclosed is an LCD device with a sub screen capable of minimizing power consumption for a driving mode of the sub screen, and an electronic device comprising the same, wherein the LCD device includes a liquid crystal display panel, and a backlight unit including a light guiding plate for guiding light from a light source toward the liquid crystal display panel, wherein the light guiding plate includes a base member having a first light-emission portion, and a second light-emission portion adjacent to the first light-emission portion, a first optical pattern part prepared in some area of the first light-emission portion adjacent to the second light-emission portion, and a second optical pattern part prepared in the second light-emission portion.