Scan-Type Backlight Isolator Suppresses Double Image
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display backlight units suffer from double image issues due to interference between light source sets, leading to degraded image quality and longer response times.
Innovation Solution
A scan-type backlight unit is designed with an isolator installed between adjacent light source sets, featuring a configuration where the isolator's height is greater than or equal to half the distance between the diffuser and the frame bottom, and a cross-sectional area that gradually decreases, along with a lining block, to prevent light interference and enhance optical quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple light source sets are used in a scan backlight unit, then the response time of the liquid crystal display is reduced, but light interference between adjacent light source sets causes double image effects
Solution Approach 1:
An isolator is introduced as an intermediary component positioned between adjacent light source sets. The isolator has a height greater than or equal to half the distance between the diffuser and the frame bottom, and its cross-sectional area gradually decreases from bottom to top. This intermediary structure blocks light from propagating between adjacent light source sets, preventing the harmful light interference that causes double image effects while allowing the scan backlight unit to operate with multiple light source sets for reduced response time
Solution Approach 2:
The harmful light propagation paths between adjacent light source sets are extracted and blocked by the isolator. By removing the interference component (light leakage between sources) from the system, the double image effect is eliminated while preserving the beneficial periodic driving function of multiple light source sets
2Object-generated harmful factors
If the isolator height is increased to prevent light interference, then double image effects are suppressed, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The isolator's geometric parameters are optimized to achieve the minimum effective height (greater than or equal to half the distance between diffuser and frame bottom) while maintaining a gradual cross-sectional area decrease. This parameter optimization ensures sufficient light blocking capability with the minimum necessary structure, avoiding excessive height or complex geometries that would increase manufacturing difficulty and device complexity
3Device complexity
If conventional backlight units are used, then the structure is simple, but light interference causes longer motion picture response time
Solution Approach 1:
The backlight unit is segmented into multiple independently controllable light source sets that can be periodically driven. This segmentation allows different regions of the backlight to be activated in sequence, reducing the overall response time for motion pictures. The isolator further segments the light paths between these sets, preventing interference while maintaining the segmented structure's speed advantage
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 effectively suppresses double image effects and reduces motion picture response time, resulting in improved image quality and faster response times for liquid crystal displays.
Implementation Method 1
The isolator is installed within the frame between adjacent light source sets... the isolator has a height larger than or equal to half the distance between the diffuser and a bottom of the frame
Implementation Method 2
The diffuser 140 is operative to evenly diffuse light emitted from the light sources 122
Data Source
AI summary
A backlight unit to effectively prevent generation of double images, having a frame, a plurality sets of light sources, at least one isolator and one diffuser. The light source sets are located within the frame and are individually driven periodically. The isolator is disposed at the bottom of the frame between adjacent light source sets. The diffuser is located on top of the frame over the light source sets and the isolator with a height larger than or equal to half the distance between the diffuser and the bottom of the frame.