Segmented Backlight and Light Shutters for LCD Power Reduction
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Solution Overview
Problem
Current liquid crystal displays (LCDs) consume high power, especially when used with auxiliary devices, as they typically require all backlight lamps to be active for full screen video display, leading to inefficient energy usage.
Innovation Solution
The display system operates in a dual mode: full screen video display and partial screen energy-saving auxiliary mode, where at least one backlight device is turned off, and light shutters control luminance, allowing for reduced power consumption by activating only necessary backlight elements during auxiliary mode operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If all backlight lamps are activated for full screen video display, then image presentation quality is maintained, but power consumption increases significantly
Solution Approach 1:
The backlight system is divided into multiple independently controllable backlight lamps corresponding to different vertical zones of the display screen. This segmentation allows selective activation of only the necessary backlight lamps based on the content being displayed, enabling energy savings while maintaining required illumination quality.
2Adaptability or versatility
If all backlight devices remain active for auxiliary device display, then display functionality is maintained, but energy efficiency deteriorates
Solution Approach 1:
The display system dynamically adapts its backlight configuration based on the operational mode. In auxiliary device display mode, the system automatically activates only the minimal necessary backlight lamps (e.g., one or two lamps) rather than all lamps, enabling energy-efficient operation while maintaining full display functionality for auxiliary content.
3Use of energy by moving object
If backlight devices are reduced in auxiliary mode, then power consumption decreases, but luminance control complexity increases
Solution Approach 1:
Light shutters are introduced as intermediary components positioned between the backlight lamps and the display screen. These shutters provide precise luminance control for the displayed image, compensating for the reduced number of active backlight lamps and enabling effective image presentation with minimal backlight activation.
Data Source
AI summary
A display comprises a front-end component having light shutters and a plurality of backlight devices, wherein the display operates in a full screen video display mode and partial screen energy-saving auxiliary mode. In the full screen video display mode, the backlight devices are activated and in the partial screen energy-saving auxiliary mode, at least one backlight device is not activated. In the auxiliary mode, the light shutters can control luminance or the light shutters along with attenuating the backlight device control luminance. In the auxiliary mode, the backlight devices are driven via enabled inputs, a digital bus system, or an analog control signal.