Backlight Module Protrusions Narrow Frame Bright Spots
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-vehicle liquid crystal displays with narrow-frame designs suffer from partial bright spots and bright lines at wide viewing angles due to the close proximity of the light guide plate in the backlight module to the display area, affecting display quality.
Innovation Solution
A backlight module with a light guide plate featuring protrusions of varying thicknesses and inclined surfaces, where the first protrusion is near the light source and the second protrusion is further away, and optical films are used to cover regions not covered by the protrusions, with adhesive layers for attachment, to prevent mirror reflection and improve light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the light guide plate is positioned close to the display area to achieve narrow-frame design, then the frame size is reduced, but partial bright spots and bright lines appear at wide viewing angles
Solution Approach 1:
The patent applies local quality by creating protrusions with different thicknesses at different locations on the light guide plate. The first protrusion has a smaller maximum thickness while the second protrusion has a larger minimum thickness, creating localized optical property variations that prevent mirror reflection at specific viewing angles without affecting the overall narrow-frame design
Solution Approach 2:
The patent introduces a new dimension by adding inclined surfaces to the protrusions on the light guide plate. The first inclined surface connects the first plane to the second plane at a first included angle, creating a three-dimensional structure that controls light reflection paths in multiple dimensions, thereby eliminating bright spots and bright lines at wide viewing angles
2Stability of the object's composition
If steps are used to fix the light guide plate to optical films, then the light guide plate is securely positioned, but the distance between steps and display area becomes small causing display quality issues
Solution Approach 1:
The patent replaces traditional step structures with locally varied protrusions that have different thickness profiles. The first protrusion and second protrusion create localized optical control zones that eliminate mirror reflection effects while maintaining secure positioning of the light guide plate relative to optical films
Solution Approach 2:
The patent uses inclined surfaces with specific included angles (30° to 60°) to create curved or angled light paths instead of sharp step transitions. This curvature approach diffuses light reflection and eliminates the geometric conditions that cause bright spots and bright lines at wide viewing angles
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 partial bright spots and bright lines at wide viewing angles, enhancing the display quality by preventing mirror reflection through beveling treatment on the light guide plate's connections and optimizing light output.
Implementation Method 1
the first plane is connected to the second plane by a first inclined surface... the first inclined surface and the light-output surface of the light guide plate are disposed at a first included angle. The first included angle is 30° to 60°
Data Source
AI summary
The present application provides a backlight module and a display device. The backlight module includes a substrate, a light source on the substrate, and a light guide plate on a side of the light source. The light guide plate includes a first region located at a periphery area of the light guide plate. At least one protrusion is disposed in the first region. A thickness of the at least one protrusion gradually increases along a direction from the light source to the light guide plate.