Corner Brightness Compensation in Backlight Light Guide Plates
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Solution Overview
Problem
The corners of light guide plates in backlight modules, particularly those with injection-molded structures, exhibit low brightness due to low light transcription rates, which is exacerbated by the inclusion of charge-coupled devices in full scanning specifications, leading to non-uniform illumination.
Innovation Solution
A backlight module design incorporating a light guide device with a first and second portion that guides light from a light source to enhance brightness at the corners of the light guide plate, utilizing optical film layers and microstructures to optimize light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If injection-molded light guide plate is used, then manufacturing efficiency is improved, but corner brightness is reduced
Solution Approach 1:
A light guide device is introduced as an intermediary component between the light source and the light guide plate. This device includes a first portion that receives light from the light source and a second portion that corresponds to the distant end of the light guide plate, guiding light to the corner regions that would otherwise be dark.
Solution Approach 2:
The light guide device is specifically positioned and configured to address the local brightness deficiency at the corners of the light guide plate. The first portion faces the light source while the second portion targets the distant end corner region, providing localized light supplementation where it is most needed.
2Illumination intensity
If light guide device is added to enhance corner brightness, then illumination uniformity is improved, but device complexity increases
Solution Approach 1:
The light guide device integrates multiple functional portions (first portion for receiving light and second portion for directing light to corners) into a single unified structure that extends along the first side of the light guide plate, simplifying the overall system while achieving corner brightness enhancement.
Solution Approach 2:
The light guide device serves multiple functions: it receives light from the light source, guides the light through its structure, and directs light to the corner regions of the light guide plate. This multi-functionality is achieved within a single component structure.
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
Enhances corner brightness and improves illumination uniformity, achieving greater than 65% overall uniformity and up to 190% relative illumination at the corners compared to standard designs.
Implementation Method 1
The light guide device at least guides the light incident from the light source to the second portion and the light is emitted and reaches the distant end of the first side
Data Source
AI summary
A backlight module is disclosed, which includes a light source, a light guide plate, an optical film layer and a light guide device. The light guide plate has a light incident edge and a first side. The light incident edge is configured towards the light source and receives light from the light source. The first side extends along the direction transverse to the light incident edge from one end of the light incident edge. The optical film layer is disposed on the light guide plate. The light guide device is disposed to extend along the first side, and the light guide device has a first portion and a second portion. The first portion faces towards the light source and receives light from the light source. The second portion corresponds to the distant end of the first side that is opposite to the light incident edge and located on the surface of the light guide device opposite to the first portion. The light guide device at least guides the light incident from the light source to the second portion and the light is emitted and reaches the distant end of the first side.