Segmented Vehicle Backlight Unit for Halo-Free Local Dimming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current backlight units in vehicles suffer from undesirable halo effects due to light ray leakage, which affects the visibility and aesthetic of digital displays, potentially leading to safety issues for drivers.
Innovation Solution
A backlight unit with a screen divided into segments that can switch between pass and block modes, using a transparent plate to direct light rays, allowing at least 45% of light rays to pass through in one region while blocking over 95% in another, eliminating halo effects and enhancing local dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional backlight unit is used to illuminate the display, then the display area is sufficiently lit, but light rays leak through the display creating a halo effect that reduces contrast and visibility
Solution Approach 1:
The backlight unit is divided into multiple independently controllable segments corresponding to regions of the display. Each segment can be controlled separately to permit or block light rays, allowing precise local dimming to eliminate halo effects while maintaining overall illumination.
Solution Approach 2:
Different regions of the backlight unit are given different optical properties - some segments permit light transmission while others block it. This local differentiation allows the system to achieve high contrast by blocking light in specific areas where halo effects would occur while maintaining illumination in other areas.
2Object-affected harmful factors
If light blocking materials are used to prevent light leakage, then halo effects are reduced, but the overall illumination and brightness of the display decreases
Solution Approach 1:
The backlight segments are made dynamically controllable, allowing the system to adaptively adjust which segments block light and which permit it. This dynamic control enables the system to minimize light blocking to only where necessary, preserving overall brightness while preventing halo effects.
Solution Approach 2:
The optical properties of each segment can be changed by applying electrical signals to switch between light-permitting and light-blocking states. This parameter change capability allows precise control over light transmission without permanently reducing overall illumination.
3Object-affected harmful factors
If the screen is divided into segments with switchable modes, then local dimming is achieved and halo effects are eliminated, but the device complexity increases
Solution Approach 1:
The control system for multiple backlight segments is merged into a unified system that can be managed through a single controller. This integration reduces the complexity burden by coordinating segment control through centralized logic rather than independent control circuits for each segment.
Solution Approach 2:
Each backlight segment is designed with multi-functionality, capable of both permitting and blocking light based on control signals. This universal design allows the same structural element to serve dual purposes, reducing the need for separate components and thereby minimizing overall device complexity.
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 achieves high contrast and high resolution digital displays by controlling light flux and eliminating halo effects, improving visibility and safety in vehicle information displays.
Implementation Method 1
a transparent plate for directing light rays through the screen
Data Source
AI summary
A backlight unit for a vehicular component is disclosed. In particular, the vehicle component is for displaying vehicular information. The backlight unit comprises a screen divided into an array of segments and a transparent plate for directing light rays through the screen. Each segment of the array of segments is capable to operate between a mode for permitting light rays to pass through, allowing light rays passing through the transparent plate and the screen, and a mode for blocking light rays from passing through blocking light rays from passing through the screen.