Backlight Module Oblique Microstructures Moire Reduction
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Solution Overview
Problem
Backlight modules in display devices suffer from the moire phenomenon and poor illumination uniformity due to the close spacing of prisms on prism sheets and limited light-emitting directivity of LEDs, leading to bright and dark bands, which affect the display effect.
Innovation Solution
A backlight module design featuring a light guide plate with oblique microstructures and a first prism film with matching prism microstructures, where the oblique microstructures on the light guide plate mix light between LEDs and adjust the light-emitting direction, and the prism film redirects light to ensure vertical emission, improving uniformity and compatibility with conventional light guide plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prism sheet with prisms arranged parallel to the backlight module is used to increase light brightness, then light brightness in orthogonal view is improved, but the moire phenomenon occurs affecting display effect
Solution Approach 1:
The patent applies asymmetry by rotating the prism arrangement direction relative to the backlight module by a specific angle (3-15 degrees), breaking the parallel alignment that causes moire phenomenon while maintaining light brightness enhancement
2Object-affected harmful factors
If the prism sheet is rotated by 3-15 degrees to prevent moire phenomenon, then the moire phenomenon is prevented, but the bright and dark bands become inclined affecting light-emitting effect
Solution Approach 1:
The patent applies local quality by introducing microlens arrays at specific locations (between light-emitting diodes) to locally correct light distribution and fill dark bands, while maintaining the rotated prism configuration for moire prevention
3Illumination intensity
If conventional light guide plate is used to solve bright and dark bands, then illumination uniformity is improved, but it cannot be used together with the rotated improved prism sheet
Solution Approach 1:
The patent applies universality by designing a light guide plate with dual functionality: it can work with both conventional parallel prism sheets and rotated improved prism sheets, achieving both bright/dark band correction and moire prevention through integrated microlens arrays
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 enhances light-emitting effect and illumination uniformity by ensuring vertical light emission and addressing the bright and dark band issue, while allowing compatibility with conventional light guide plates.
Implementation Method 1
The oblique microstructures are disposed in the first area, in which each of the oblique microstructures has a first slope
Implementation Method 2
The first prism film has plural first prism microstructures, and each of the first prism microstructures has a second slope
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a light guide plate, a light source and a first prism film. The light guide plate includes a main body and plural oblique microstructures. The main body has a light-incident surface and at least one main surface connected to the light-incident surface. The main surface has a first area and a second area. The oblique microstructures are disposed in the first area. Each of the oblique microstructures has a first slope. A light source is disposed adjacent to the light-incident surface. The first prism film is disposed in front of the light guide plate. The first prism film has plural first prism microstructures. Each of the first prism microstructures has a second slope. One of the first slope and the second slope is a positive number, and the other one is a negative number.