Light Guide Plate Reflecting Prism Structure for Backlight Leakage
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Solution Overview
Problem
Conventional prism light guide plates in backlight modules experience significant light leakage at the junction with the fixing plastic frame, affecting display quality.
Innovation Solution
A light guide plate with a reflecting prism structure mounted on two sides, featuring a combination of plane mirrors and varying height-to-width aspect ratio strip-shaped prisms, is used to reflect light back into the plate body, reducing leakage by enhancing total internal reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If light-exiting strip-shaped prisms are mounted on the light-exiting surface to enhance light source work efficiency, then light convergence is improved, but light leakage occurs at the junction between the light guide plate and the fixing plastic frame
Solution Approach 1:
The light-exiting surface is divided into two distinct regions: a non-reflecting area where light-exiting strip-shaped prisms are mounted for light convergence, and a reflecting area at the edges where light is reflected back into the plate body. This segmentation allows each region to perform its specific function without causing light leakage at the junction.
Solution Approach 2:
Different regions of the light-exiting surface are given different optical properties: the central non-reflecting area has light-exiting prisms for convergence, while the edge reflecting area has reflective properties to prevent light leakage. This local differentiation of optical characteristics solves the contradiction between light convergence and light leakage prevention.
2Ease of manufacture
If the light guide plate structure is simplified for ease of manufacture, then manufacturing cost is reduced, but light leakage control becomes more difficult
Solution Approach 1:
The reflecting area and reflecting prism structure are integrated directly into the light guide plate body as a unified component, eliminating the need for separate fixing plastic frames or additional light-trapping components. This merging of functions into a single plate structure simplifies manufacturing while effectively controlling light leakage through the embedded reflecting edges.
3Illumination intensity
If light propagation distance is increased through total internal reflection, then brightness is improved, but light leakage occurs when total internal reflection does not occur at side surfaces
Solution Approach 1:
The reflecting area is positioned at the edge regions of the light guide plate before light can escape. The reflecting prism structure in this area preemptively reflects light back into the plate body, preventing light leakage before it occurs. This preliminary anti-action ensures that light is contained within the plate throughout its propagation path.
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 minimizes light leakage and increases light-output efficiency while maintaining the converging effect of the light-exiting strip-shaped prisms, improving display quality and manufacturing simplicity.
Implementation Method 1
the lights that propagate along an extension direction Y (which is basically perpendicular to the incident surface 112 of the light guide plate) of the light-exiting strip-shaped prisms 110 may have a longer propagation distance due to total internal reflection
Implementation Method 2
a reflecting prism structure mounted in the reflecting area for reflecting lights back to the plate body
Data Source
AI summary
The present invention relates to a light guide plate and a corresponding backlight module. The light guide plate has a plate body, a light-exiting prism structure and a reflecting prism structure. The reflecting prism structure is mounted on a reflecting area on a light-exiting surface of the plate body. The light guide plate and the corresponding backlight module can reduce light leakage at the junction between the light guide and a fixing plastic frame by the reflecting prism structure mounted at sides of the light guide plate.