Backlight Module Light Guide Plate Incident Surface Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional edge-type backlight modules using LEDs as light sources often exhibit light column phenomena due to restricted light emitting angles, resulting in non-uniform illumination and reduced light energy utilization efficiency, as dark areas adjacent to the light source cannot be completely eliminated by existing diffusing structures.
Innovation Solution
A backlight module design featuring a light guide plate with a semi-transmissive and semi-reflective film on its incident surface and a reflector with curved or inclined sections surrounding the light source, which cooperatively reflects and redirects light beams to eliminate dark areas and enhance light distribution uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LEDs are used as light sources in edge-type backlight modules, then the lifespan and reliability are improved, but light column phenomena occur due to restricted light emitting angles
Solution Approach 1:
The incident surface of the light guide plate is segmented into multiple regions, each with different refractive index structures. Specifically, the incident surface includes first, second, and third regions with varying numbers and arrangements of light extracting structures, allowing different zones to handle light distribution differently to eliminate dark areas while maintaining LED reliability
Solution Approach 2:
Different regions of the incident surface are given different local optical properties. The first region has a higher density of light extracting structures compared to the second and third regions, creating localized light diffusion zones that address the light column phenomenon specifically where dark areas occur without affecting overall LED performance
2Illumination intensity
If conventional diffusing structures are used in light guide plates, then light distribution is improved, but dark areas adjacent to the light source cannot be completely eliminated
Solution Approach 1:
The light extracting structures incorporate curved or rounded features instead of purely linear patterns. The second and third regions have light extracting structures with curved arrangements that better scatter light in multiple directions, effectively filling dark areas adjacent to the LED while improving light energy utilization
Solution Approach 2:
The patent transitions from two-dimensional planar diffusing patterns to three-dimensional light extracting structures with varying depths and configurations. The light extracting structures extend into the light guide plate with different heights and shapes, creating additional dimensional pathways for light diffusion that eliminate dark areas more effectively
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 eliminates light column phenomena and improves light energy utilization efficiency by uniformly distributing light across the incident surface, ensuring consistent illumination and optimized energy use.
Implementation Method 1
At least one semi-transmissive and semi-reflective film disposed on the incident surface of the light guide plate. The semi-transmissive and semi-reflective film and the reflecting device together are disposed for cooperatively reflecting some (i.e., a fraction) of the light beams emitted from the light source and redirecting the fraction of the light beams into the light guide plate through the incident surface, distant from the light source.
Implementation Method 2
Light beams emitted from the light sources are optically coupled into the incident surface, enter the light guide plate, advantageously reflected, as needed, by the microstructure of the back reflective surface, and then transmitted out from the emitting surface uniformly to illuminate an LCD panel.
Data Source
AI summary
A backlight module includes a light guide plate having an incident surface, an emitting surface adjacent to the incident surface, and a reflective surface opposite to the emitting surface. At least one light source is disposed adjacent the incident surface. The light source has a luminescent surface; and at least one reflecting device is disposed adjacent the light source. The reflecting device has a reflective surface facing the incident surface. At least one semi-transmissive and semi-reflective film disposed on the incident surface of the light guide plate. The semi-transmissive and semi-reflective film and the reflecting device together are disposed for cooperatively reflecting some (i.e., a fraction) of the light beams emitted from the light source and redirecting the fraction of the light beams into the light guide plate through the incident surface, distant from the light source.