Light Guide Plate Microstructures for Backlight Brightness Uniformity
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Solution Overview
Problem
Existing light guide plates in backlight modules suffer from limited light utilization and uneven light emission, leading to brightness uniformity issues and optical appearance problems.
Innovation Solution
A light guide plate with stripe-shaped microstructures and light-guiding microstructures is introduced, where the stripe-shaped microstructures are disposed on the light-emitting surface or bottom surface, and the light-guiding microstructures are arranged between adjacent stripe-shaped microstructures, adjusting the light-emitting location and amount to enhance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If normal microstructures are used on the light-emitting surface or reflective surface, then the structure is simple, but the light utilization is limited and brightness uniformity is poor
Solution Approach 1:
The light guide plate surface is segmented into multiple types of microstructures (first microstructures, second microstructures, and third microstructures) with different functions. The first microstructures control light emission direction, the second microstructures adjust light distribution, and the third microstructures enhance light extraction, collectively improving brightness uniformity and light utilization
Solution Approach 2:
Different regions of the light guide plate are equipped with microstructures having different properties. The front surface has first microstructures with specific inclination angles for directional control, while the rear surface has second microstructures for light extraction enhancement, creating local optimization of light management
2Illumination intensity
If normal microstructures are used on the light-emitting surface or reflective surface, then the manufacturing process is simple, but optical appearance problems occur such as uneven light emission
Solution Approach 1:
The complex light management function is segmented into multiple microstructure types positioned at different locations and orientations. This segmentation allows each microstructure type to be optimized for its specific function while collectively achieving uniform light emission without requiring overly complex single-structure designs
Solution Approach 2:
The first microstructures feature asymmetric inclination angles where the front surface inclination angle differs from the rear surface inclination angle. This asymmetric design enables precise control of light emission direction and improves uniformity by accounting for the different optical paths at the front and rear surfaces
3Ease of operation
If traditional light guide plate structure is used, then the device complexity is low, but the light-emitting view angle control is insufficient
Solution Approach 1:
The first microstructures are pre-configured with specific inclination angles during manufacturing to predetermined values that control the light emission view angle. This preliminary action ensures that the light guide plate inherently provides optimal view angle control without requiring additional adjustment mechanisms, balancing functionality with structural simplicity
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 adjusts the light-emitting view angle and improves overall light-emitting uniformity, addressing the issues of limited light utilization and uneven emission in traditional light guide plates.
Implementation Method 1
light emitted by the light source enters the light guide plate through the light-incident surface, and is emitted out from the light-emitting surface
Implementation Method 2
A light provided by a light source enters the light guide plate through the light-incident surface, and is emitted out from the light-emitting surface
Implementation Method 3
the amount of the light reflected or refracted by the normal microstructures
Implementation Method 4
the amount of the light reflected or refracted by the normal microstructures
Data Source
AI summary
A light guide plate, a backlight module and a display device are provided. The light guide plate is configured to be coupled to a light source. The light guide plate includes a light-emitting surface, a bottom surface, a light-incident surface, plural stripe-shaped microstructures and plural light guiding microstructures. The bottom surface is opposite to the light-emitting surface. The light-incident surface is connected between the light-emitting surface and the bottom surface. The stripe-shaped microstructures are disposed on the at least one of the light-emitting surface and the bottom surface, and each of the stripe-shaped microstructures has two opposing side surfaces and an active surface. The side surfaces are respectively connected to two opposite sides of the active surface. The light-guiding microstructures are disposed between any adjacent two of the stripe-shaped microstructures and arranged along an extending direction of each of the stripe-shaped microstructures.