Light Guide Plate Assembly Uniformity via Transmissive Part Design
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Solution Overview
Problem
Current backlight modules for LCD displays exhibit uneven light brightness at different positions due to varying light intensity emitted by the light-emitting elements, leading to issues like visible grid patterns and reduced optical uniformity.
Innovation Solution
A light guide plate assembly is designed with a reflective part and a transmissive part, where the transmissive part has a specific light intensity profile that matches the light distribution curve of the light-emitting element, ensuring uniform light intensity across different positions by adjusting light transmittance and incorporating diffusion particles to scatter light, thereby improving optical uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight module is used, then the display device can function, but the light brightness is uneven at different positions
Solution Approach 1:
The light guide plate is divided into different regions (reflective part and transmissive part) with different optical properties. The transmissive part includes a first part and second part with different light transmittance characteristics, allowing each region to perform its specific function optimally - the first part transmits light with lower transmittance to reduce intensity, while the second part transmits light with higher transmittance to maintain brightness
Solution Approach 2:
The patent changes the light transmittance parameter of different parts of the light guide plate to compensate for the light intensity distribution. By adjusting the transmittance of the first part to be lower than the second part, the system compensates for the higher light intensity in certain regions, achieving uniform overall light distribution
2Illumination intensity
If the light guide plate assembly uses a complex structure to improve uniformity, then optical uniformity improves, but device complexity increases
Solution Approach 1:
The reflective part and transmissive part are integrated into a single light guide plate assembly, combining multiple functions (light reflection, light transmission, light diffusion) into one component. This reduces the number of separate parts and simplifies the overall structure while maintaining the ability to achieve uniform light distribution
Solution Approach 2:
The light guide plate assembly serves multiple functions simultaneously: the reflective part reflects light to redirect it, the transmissive part transmits light to the display, and diffusion particles within the assembly scatter light to improve uniformity. This multi-functionality reduces the need for separate components
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 addresses the issue of uneven light intensity, enhancing the optical uniformity of the backlight module and reducing the thickness of the module, while avoiding interference between light-emitting elements and improving the visual quality of the display.
Implementation Method 1
incorporating diffusion particles to scatter light
Implementation Method 2
The reflective part has an opening
Data Source
AI summary
A light guide plate assembly, a backlight module, and a display device are provided. The light guide plate assembly is configured to guide exiting light emitted from a light-emitting element. The light guide plate assembly includes a reflective part includes an opening, and a transmissive part. At least a part of the transmissive part is located at a side of the reflective part adjacent to a light-exiting side of the light guide plate assembly. The transmissive part includes a first part. Along a direction from a center of the opening to an edge of the opening, light intensity of the exiting light received by the first part is negatively correlated to light transmittance of the first part.