Vehicle Display Backlight Using Single LED Packages for Power Reduction
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Solution Overview
Problem
Conventional vehicle instrument panels face challenges in achieving high contrast ratios while minimizing power consumption, as zone backlighting typically requires higher backlighting power, leading to inefficiencies in energy usage and potential thermal issues with light-emitting diodes.
Innovation Solution
The display system incorporates a light source with a combination of single and dual light-emitting diode packages, where the number of single LED packages is greater than dual LED packages, optimized to consume less power and maintain luminance, with the single LED packages arranged in strings to reduce current and voltage, thereby improving efficiency and reducing junction temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If zone backlighting is used to increase contrast ratio, then contrast ratio performance is improved, but power consumption increases
Solution Approach 1:
The backlight is divided into multiple independently controllable zones corresponding to different display regions. Each zone can be dimmed or brightened separately based on the content being displayed, allowing high contrast ratios in specific areas while maintaining lower power consumption overall by not illuminating the entire backlight at maximum intensity.
Solution Approach 2:
Different regions of the backlight are assigned different intensity levels tailored to the specific display requirements of each zone. Critical information areas receive higher illumination for enhanced visibility, while less important areas use lower illumination, optimizing the balance between contrast ratio performance and power consumption.
2Illumination intensity
If higher backlight intensity is used to achieve high contrast ratio, then contrast ratio performance is improved, but thermal issues and power consumption increase
Solution Approach 1:
The backlight is segmented into multiple zones that can be independently controlled. Instead of uniformly increasing backlight intensity across the entire display, only specific zones requiring high contrast are illuminated at higher intensities, thereby reducing the overall thermal load and power consumption while maintaining the desired contrast ratio performance in critical areas.
Solution Approach 2:
The system dynamically adjusts the intensity parameters of different backlight zones based on display content requirements. By changing the illumination parameters locally rather than globally, the system achieves high contrast ratios where needed while minimizing thermal generation and power consumption across the entire backlight system.
3Illumination intensity
If more light-emitting diode packages are used to increase luminance, then luminance output is improved, but power consumption and complexity increase
Solution Approach 1:
The backlight system is divided into multiple independently controllable LED zones. By selectively activating only the zones that require illumination based on display content, the system achieves sufficient luminance output while minimizing the number of active LED packages, thereby reducing power consumption and system complexity compared to using more LED packages uniformly across the entire backlight.
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 configuration enhances power efficiency by reducing power consumption and operational temperature, achieving a higher luminous flux while maintaining lower junction temperatures, thus improving the overall performance and energy efficiency of the display system.
Implementation Method 1
The light source includes a first number of first packages each having a single light-emitting diode
Implementation Method 2
each having a single light-emitting diode
Data Source
AI summary
A power reduced display includes a light source having an available space and configured to generate a backlight, a first display having multiple first pixels, wherein each first pixel is configured to selectively pass and block the backlight, a second display having multiple second pixels. The light source includes a first number of first packages each having a single light-emitting diode. The first number is a largest number of the first packages that fit in the available space of the light source. The first number of the first packages is configured to consume a first power to produce a particular luminance. A second number of second packages each having two light-emitting diodes alternatively fit in the available space and is configured to consume a second power to produce the particular luminance. The first number is greater than the second number. The first power is less than the second power.