Backlight Module Curved Reflector Brightness Uniformity
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Solution Overview
Problem
Conventional edge-lighting type backlight modules for liquid crystal displays suffer from dark areas adjacent the incident surface of the light guide plate due to light beam blocking by LEDs and inefficient light utilization, resulting in non-uniform brightness.
Innovation Solution
A backlight module design featuring a light guide plate with a reflector having a curved reflective surface positioned adjacent the light source, allowing light beams to be uniformly reflected into the light guide plate through the incident surface, eliminating dark areas by optimizing the angle of inclination between the emitting and incident surfaces, which ranges from 0 to 180 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If V-shaped grooves are arranged regularly and periodically in the incident surface, then the area of dark areas is reduced, but the deflection angle is limited to less than 90 degrees and light energy utilization efficiency decreases
Solution Approach 1:
The patent applies a curved reflective surface instead of flat V-shaped grooves. The curvature enables light beams to be reflected at various angles including greater than 90 degrees, allowing complete elimination of dark areas while improving light energy utilization efficiency. The curved surface shape is specifically designed to redirect light effectively without the limitations of linear groove structures.
2Device complexity
If LEDs are positioned adjacent the incident surface of the light guide plate, then the structure is compact, but dark areas are formed adjacent the incident surface due to light beam blocking
Solution Approach 1:
The patent introduces a reflector as an intermediary component between the LED light source and the light guide plate. This reflector captures light beams that would otherwise be blocked by the LED structure and redirects them into the light guide plate, eliminating dark areas while maintaining the compact arrangement of LEDs adjacent to the incident surface.
3Illumination intensity
If the angle of inclination between emitting surface and incident surface is optimized, then dark areas are eliminated, but the design complexity increases
Solution Approach 1:
The patent optimizes the angle of inclination between the emitting surface and incident surface as a key parameter to eliminate dark areas. By carefully selecting this angular parameter in combination with the curved reflective surface geometry, the design achieves uniform brightness distribution while managing design complexity through parameter optimization rather than complex structural arrangements.
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
This design ensures all light beams are reflected into the light guide plate, eliminating dark areas and achieving highly uniform brightness by preventing light beam blocking and enhancing light energy utilization.
Implementation Method 1
The reflector has a curved reflective surface facing the emitting surface that is shaped and positioned for uniformly reflecting light beams emitted from the light source into the light guide plate through the incident surface
Implementation Method 2
Light beams incident on the light diffusing portions 936 are scattered. The diffusing portions 936 can thereby reduce the area of dark areas formed adjacent the incident surface 932
Data Source
AI summary
A backlight module includes a light guide plate, a light source, and a reflector. The light guide plate includes an incident surface and a corner adjacent the incident surface. The light source is disposed adjacent the incident surface and the corner of the light guide plate. The light source has an emitting surface. The reflector is disposed substantially facing the incident surface. The reflector has a curved reflective surface facing the emitting surface, the surface being shaped and positioned for uniformly reflecting light beams emitted from the light source into the light guide plate through the incident surface. An angle of inclination of the emitting surface with respect to the incident surface is chosen to be in the range from above about 0 to about 180 degrees. The backlight module can effectively eliminate shadow formation adjacent the incident surface of the light guide plate.