Backlight Assembly Reflective Structure for LCD Brightness Uniformity
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Solution Overview
Problem
Conventional LCD backlight modules using point light source LEDs suffer from non-uniform screen brightness distribution due to hot spots, degrading image quality.
Innovation Solution
A backlight assembly with a reflective structure having tilted reflective surfaces that convert point light sources from LEDs into line light sources, uniformly guiding light onto a light guide plate to prevent hot spots and enhance brightness distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If point light source LEDs are used directly, then the device complexity is reduced, but screen brightness distribution uniformity deteriorates due to hot spots
Solution Approach 1:
A reflective structure is introduced as an intermediary component between the point light source LEDs and the light guide plate. This reflective structure converts the point light source into a line light source by reflecting light at specific angles, thereby eliminating hot spots and improving brightness distribution uniformity without significantly increasing device complexity
Solution Approach 2:
The reflective structure transforms light propagation from a point source (0D) to a line source (1D) by utilizing angular reflection. This dimensional transformation distributes light more uniformly across the light guide plate, converting concentrated point light into extended line light that covers a broader area
2Manufacturing precision
If point light source LEDs are used, then manufacturing precision requirements are reduced, but screen brightness distribution uniformity deteriorates
Solution Approach 1:
The reflective structure serves as a mediator that compensates for the inherent limitations of point light sources. By introducing this intermediate component with specific geometric parameters (tilt angles between 30°-60°), the system achieves uniform brightness distribution without requiring extremely high manufacturing precision from the LED sources themselves
3Device complexity
If light is emitted directly from LEDs without reflection, then the device structure is simpler, but hot spots are generated causing non-uniform brightness
Solution Approach 1:
The reflective structure converts the harmful concentrated light from point sources into beneficial distributed light. By strategically positioning reflective surfaces at specific angles, the system transforms the inherent hot spot problem into an opportunity to create uniform line light distribution, eliminating harmful concentrated energy while maintaining simple device structure
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 reduces hot spots and improves screen brightness distribution uniformity and overall image quality by converting point light sources into line light sources, ensuring more even light propagation.
Implementation Method 1
a reflective structure having at least one reflective surface facing the LEDs and tilted at a constant angle. The light emitted from the LEDs is reflected by the reflective surface to have the shape of light emitted from a line light source
Data Source
AI summary
A backlight assembly having a plurality of light emitting diodes (LEDs) and a light guide plate for uniformly guiding light emitted from the LEDs to a liquid crystal substrate is provided. The backlight assembly includes a reflective structure having at least one reflective surface facing the LEDs and tilted at a constant angle. The light emitted from the LEDs is reflected by the reflective surface to have the shape of light emitted from a line light source and be incident on the light guide plate. In effect, hot spots degrading screen quality and screen brightness distribution non-uniformity can be prevented.