Selective LED Backlight Array Segmentation for Power Reduction
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Solution Overview
Problem
Existing video display technologies, such as LCDs, face challenges in efficiently managing backlight illumination, particularly in conserving energy when only partial illumination is needed, as all backlight LEDs are typically activated simultaneously, leading to unnecessary power consumption.
Innovation Solution
A system comprising a plurality of light sources, including LEDs, arranged in an array and connected to switches on a substrate, allowing for selective activation based on a control signal, enabling partial illumination and energy conservation by isolating sections of the LED array using intermediate connectors and switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If all backlight LEDs are activated to enhance display visibility and performance, then image quality and visual contrast are improved, but energy consumption increases
Solution Approach 1:
The backlight LED array is divided into multiple independently controllable segments or zones. Each segment can be selectively activated or deactivated based on display requirements, allowing partial illumination rather than full-array activation. This segmentation enables the system to provide adequate visibility for the displayed content while consuming less energy by illuminating only the necessary portions of the display.
2Illumination intensity
If all backlight LEDs are activated to ensure full display illumination, then complete image visibility is achieved, but battery life is reduced
Solution Approach 1:
The backlight system is segmented into multiple controllable zones that can be independently managed. By activating only the segments corresponding to visible or relevant display content while keeping other segments inactive, the system maintains sufficient illumination for user interaction and content viewing, thereby extending battery life during operations such as standby, sleep mode, or when displaying content that doesn't require full-screen illumination.
3Use of energy by moving object
If selective activation of backlight LEDs is implemented to conserve energy, then power consumption is reduced, but display uniformity and image quality may deteriorate
Solution Approach 1:
Different segments of the backlight array are selectively activated based on the local requirements of the display content. The system adjusts illumination distribution to match the actual content being displayed, providing higher illumination where needed and reducing or eliminating illumination in areas where content is not present or less important. This local quality approach maintains display uniformity and image quality while reducing overall power consumption.
Solution Approach 2:
The backlight segmentation system dynamically adjusts which segments are activated based on real-time display content analysis, user interaction patterns, and operational context. This dynamic control allows the system to optimize the balance between energy consumption and display quality, transitioning smoothly between different illumination patterns to maintain perceived uniformity while conserving energy.
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 allows for significant energy savings by selectively illuminating only necessary portions of the display, reducing power consumption by up to 75% compared to full backlight operation, as demonstrated in various applications including mobile devices, vehicles, and televisions.
Implementation Method 1
the source of LCD backlight illumination is light emitting diodes (LEDs)
Data Source
AI summary
A system and method for the selective illumination of a display backlight, the system including a plurality of light sources configured in an array, a plurality of switches electrically connected to the plurality of light sources, and at least one substrate configured to receive the plurality of light sources and the plurality of switches, wherein the plurality of switches are configured to operate at least a portion of the plurality of light sources based upon a control signal, and wherein the at least one substrate includes a power supply connection.