LED Backlight Segmentation for LCD Power Reduction
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Solution Overview
Problem
Large-sized and high-definition liquid crystal displays consume high power, leading to increased energy costs and an unattractive appearance when not in use, especially when mounted on walls in home or office environments.
Innovation Solution
A liquid crystal display system with a light source controller that dynamically controls LED light sources to reduce power consumption by selectively turning on and off light-emitting diode (LED) units and adjusting brightness during a self-screen mode, using a light source drive circuit and dimming signals to manage power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If all LED light source units are turned on continuously, then the display appearance is bright and attractive, but power consumption increases significantly
Solution Approach 1:
The backlight unit is divided into multiple independently controllable LED light source units (first, second, third, and fourth units). The controller can selectively turn on or off specific segments based on display mode, enabling partial illumination to reduce power consumption while maintaining adequate brightness for different usage scenarios
Solution Approach 2:
The system dynamically adjusts the illumination state of LED light source units based on real-time display mode detection. In self-screen mode, only necessary light units are activated; in normal display mode, all units are turned on. This dynamic adaptation resolves the contradiction between maintaining brightness and reducing power consumption
2Use of energy by moving object
If LED light source units are turned off to reduce power consumption, then power usage decreases, but the display appearance becomes dark and unattractive
Solution Approach 1:
Different regions of the display are illuminated with different intensities based on local needs. In self-screen mode, the controller selectively activates specific LED units corresponding to different display regions, providing sufficient brightness where needed while leaving other regions dark, thus maintaining aesthetic appearance with reduced overall power consumption
Solution Approach 2:
Instead of turning on all LED light source units, the system applies partial action by activating only the necessary portions required for self-screen display functionality. This partial illumination is sufficient to maintain display appearance and functionality while significantly reducing power consumption compared to full illumination
3Illumination intensity
If the display is left on continuously to maintain an attractive appearance, then the display remains visible and aesthetic, but power consumption increases
Solution Approach 1:
The controller periodically assesses the display mode and adjusts LED illumination accordingly. During self-screen mode, selective illumination is applied; during normal operation, full illumination is provided. This periodic adaptation allows the display to maintain attractiveness during critical periods while conserving energy during other periods
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 reduces power consumption by up to 90% during self-screen mode while maintaining a bright and attractive appearance, ensuring the display is not dark even with minimal LED usage, thus addressing the issues of high power consumption and aesthetics.
Implementation Method 1
a first light emitting diode (LED) light source unit configured to selectively irradiate light onto the first display portion, a second LED light source unit configured to selectively irradiate light onto the second display portion
Data Source
AI summary
A liquid crystal display includes a liquid crystal display panel, a first and a second light emitting diode (LED) light source unit configured to irradiate light onto the liquid crystal display panel, a light source drive circuit configured to individually drive the first and second LED light source units, and a light source controller configured to generate the address signal and dimming signal and transmit the address signal and dimming signal to the light source drive circuit in a self screen mode.