Backlight Module Notch Design for Luminance Uniformity
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Solution Overview
Problem
Narrow-framed liquid crystal displays (LCDs) face issues with uneven luminance due to irregularly-shaped designs, where light aggregation forms bright or dark regions, affecting visual effects and screen-to-body ratio.
Innovation Solution
A backlight module comprising a metal frame with an irregularly-shaped notch, a light guide plate, a light source, and an adhesive frame with gaps, where the adhesive frame includes light guide portions to distribute light uniformly, preventing dark regions and enhancing luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If irregularly-shaped display design is used to narrow the frame, then screen-to-body ratio is improved, but luminance uniformity deteriorates due to light aggregation forming bright or dark regions
Solution Approach 1:
The patent introduces a light guide portion with specific light-guiding structures (prisms or diffusers) in the adhesive frame at locations corresponding to dark regions. This creates local optical quality enhancement where light is redirected or diffused specifically in areas needing improvement, while other regions maintain their original light transmission characteristics. This resolves the contradiction by applying different optical properties to different locations to maintain overall luminance uniformity in the irregularly-shaped display.
2Illumination intensity
If light guide portions are added to improve luminance uniformity, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent integrates the light guide portion directly into the adhesive frame structure, merging the light-guiding function with the existing structural component that bonds the light guide plate to the housing. This eliminates the need for separate light-guiding elements and reduces assembly steps, thereby improving luminance uniformity without proportionally increasing device complexity.
Solution Approach 2:
The adhesive frame serves dual functions: it provides structural support and bonding between components, and simultaneously acts as a light guide through integrated optical structures. This multi-functionality reduces the total number of components needed while achieving the light distribution improvement, thus enhancing luminance uniformity without significantly increasing device complexity.
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 expands the light-exiting surface, improves luminance uniformity, and enhances the display effect by increasing the amount of exiting light from dark regions, addressing the issue of uneven luminance in narrow-framed LCDs.
Implementation Method 1
The light guide plate, the light source and the adhesive frame are all disposed in the accommodating cavity... a first light guide portion is disposed in the first gap... effectively expands the light-exiting surface, improves luminance uniformity
Data Source
AI summary
Backlight module and display device are provided. The backlight module includes: a metal frame including a bottom plate and a sidewall, a light guide plate, a light source, an adhesive frame, and a notch. An accommodating cavity is formed between the bottom plate and a sidewall, the sidewall including first, second, third, and fourth sidewalls. The first sidewall includes at least one irregularly-shaped portion, protruding toward an inside of the accommodating cavity to form the notch. The light guide plate, the light source and the adhesive frame are all disposed in the accommodating cavity. The adhesive frame is between the light guide plate and the sidewall. The light source is between the light guide plate and the third sidewall. The adhesive frame includes at least one first gap on a side of the notch away from the light source. A first light guide portion is disposed in the first gap.