Light-Guiding Plate Assembly for Backlight Uniformity
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Solution Overview
Problem
Existing backlight modules for LCD panels suffer from uneven light brightness and optical crosstalk, which affect the uniformity and efficiency of light emission.
Innovation Solution
A light-guiding plate assembly with a reflective portion and a transmissive portion, including a first and second sub-transmissive portion, is used to guide light emitted from a backlight, where the first sub-transmissive portion does not overlap the reflective portion, and the second sub-transmissive portion is located on the side facing the light-exiting side, effectively reflecting large-angle light and transmitting small-angle light to improve brightness and reduce crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight module is used, then the LCD panel can be illuminated, but the light brightness is uneven and optical crosstalk occurs
Solution Approach 1:
The light-guiding plate is divided into multiple light-guiding units, each with independent reflective and transmissive portions. This segmentation allows different regions to handle light differently, preventing crosstalk between adjacent light-emitting elements while maintaining uniform illumination across the display panel.
Solution Approach 2:
Different portions of the light-guiding plate have different optical properties: reflective portions reflect large-angle light, while transmissive portions transmit small-angle light. This local differentiation of optical characteristics enables precise control over light distribution, improving uniformity and reducing crosstalk simultaneously.
2Illumination intensity
If large-angle light is transmitted directly, then the structure is simple, but light utilization efficiency is low and brightness is insufficient
Solution Approach 1:
Large-angle light that would normally be wasted or cause crosstalk is captured by the reflective portions and redirected to useful positions. This converts potentially harmful stray light into beneficial illumination, improving overall light utilization efficiency and brightness without requiring additional light sources.
Solution Approach 2:
The reflective portions are positioned at specific angles and depths within the light-guiding plate structure, creating a three-dimensional light redirection system. This spatial arrangement enables efficient capture and redirection of large-angle light from multiple directions, maximizing light utilization.
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 configuration enhances the uniformity of light emission, improves the utilization of large-angle light, and reduces power consumption by balancing light intensity across different regions, thereby improving the overall brightness and efficiency of the backlight module.
Implementation Method 1
the reflective portion and a transmissive portion... effectively reflecting large-angle light
Implementation Method 2
the transmissive portion includes a first sub-transmissive-portion and a second sub-transmissive-portion... transmitting small-angle light
Data Source
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AI summary
Provided are a light-guiding plate assembly, a backlight module and a display device, relating to the field of display technologies to improve the light-emitting uniformity and alleviate the crosstalk of the backlight module. The light-guiding plate assembly includes a reflective portion and a transmissive portion. The transmissive portion includes a first sub-transmissive-portion and a second sub-transmissive-portion. In the direction perpendicular to the plane where the light-guiding plate assembly is located, the first sub-transmissive-portion does not overlap the reflective portion, and the second sub-transmissive-portion is located on a side of the reflective portion facing a light-exiting side of the light-guiding plate assembly.