Backlight Module Reflector Groove Light Guide Plate Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight modules, particularly those using cold cathode fluorescent lamps (CCFLs), suffer from high energy consumption, non-uniform brightness, and color shift issues, while LED-based modules have limited light emission angles leading to non-uniform brightness due to dark regions between LEDs.
Innovation Solution
A backlight module design featuring a light guide plate with a groove on its light-emitting surface and a reflector positioned between the light source and the light guide plate, which guides light into the plate as parallel light, enhancing uniformity through a micro-prism system, polarization management, and scattering plate for improved light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are used as light sources in backlight modules, then energy consumption is reduced and service life is extended, but non-uniform brightness occurs due to limited light emission angles creating dark regions between adjacent LEDs
Solution Approach 1:
The patent applies local quality by creating a reflector with a specific curved surface geometry that is positioned locally between the light source and light guide plate. This curved reflector surface is designed to redirect light at specific angles to fill the dark regions between LED emission areas, thereby locally improving brightness uniformity without changing the LED light sources themselves.
Solution Approach 2:
The curved reflector serves as an intermediary element between the LED light source and the light guide plate. It mediates the light distribution by reflecting and redirecting light rays that would otherwise create dark regions, transforming the non-uniform LED output into a more uniform illumination pattern before it enters the light guide plate.
2Illumination intensity
If a reflector with curved surface is added to improve light uniformity, then brightness uniformity is enhanced, but device complexity increases
Solution Approach 1:
The patent merges the reflector function with the existing backlight module structure by positioning the curved reflector in the space between the light source and light guide plate. This integration approach adds the light-redistributing function without requiring separate complex subsystems, thereby enhancing uniformity while minimizing the increase in 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 uniform light output and brightness across the display, addressing the non-uniformity issues of LED-based modules and meeting high-end LCD requirements.
Implementation Method 1
The reflector includes a light-receiving surface. The light source is facing the light-receiving surface of the reflector.
Implementation Method 2
The light-emitting surface of the light guide plate includes a groove formed therein
Data Source
AI summary
A backlight module includes a light source, a light guide plate and a reflector. The light guide plate includes a light incidence surface, a light-emitting surface opposite to the light incidence surface, and a pair of side surfaces connecting the light incidence surface to the light-emitting surface. The light-emitting surface of the light guide plate includes a groove formed therein. The reflector is placed between the light source and the light incidence surface of the light guide plate, and located corresponding to the groove of the light-emitting surface of the light guide plate. The reflector includes a light-receiving surface. The light source is facing the light-receiving surface of the reflector.