Backlight Assembly Edge Brightness via Light Guide Structure
Solution Overview
Problem
Large-size liquid crystal display panels experience low brightness at the edges due to inadequate light distribution from traditional backlight sources, particularly when formed by splicing multiple sub-panels, resulting in uneven display brightness.
Innovation Solution
A backlight assembly comprising a light-emitting element, a light guide plate, and a light guide structure that directs light from the center region to the edge regions, improving light uniformity and brightness by elevating the light guide plate and strategically arranging light guide structures along the edges of the light guide plate to ensure more light reaches the edge regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional backlight source (straight down or side entry) is used, then the structure is simple, but the brightness at the edge of the display region is low
Solution Approach 1:
The backlight assembly is divided into distinct functional components: a light guide plate with specific refractive index, light guide structures positioned at edges, and a light-emitting element. This segmentation allows each component to perform its specialized function - the light guide plate distributes light while edge structures redirect light to dark areas, resolving the contradiction between simplicity and edge brightness.
Solution Approach 2:
Different regions of the backlight assembly have different optical properties. The light guide plate has a specific refractive index (1.4-1.6) optimized for light distribution, while light guide structures at the edges have different refractive indices (1.5-1.7) to redirect light. This local optimization of optical properties enables edge regions to receive sufficient light without complicating the entire system.
2Area of stationary object
If multiple sub-display panels are spliced to form a large-size display, then the display size is increased, but the brightness at the seam edges becomes low
Solution Approach 1:
Light guide structures are strategically positioned at the edge regions corresponding to seam locations. These structures have different optical properties from the main light guide plate, enabling them to redirect light specifically to the dark seam areas. This localized optimization allows large spliced displays to maintain uniform brightness across seams without reducing overall display size.
3Stability of the object's composition
If light guide structures with different refractive indices are used, then light distribution uniformity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies practical refractive index ranges rather than precise values: light guide plate (1.4-1.6), light guide structures (1.5-1.7). These ranges provide sufficient design flexibility to achieve uniform light distribution while accommodating normal manufacturing variations. By defining parameter ranges instead of fixed values, the patent reduces manufacturing precision requirements while maintaining light distribution uniformity.
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 enhances light uniformity and brightness at the edges of the display panel, reducing the dark appearance of edge regions near seams in spliced display panels and improving overall display effectiveness.
Implementation Method 1
a light guide structure which has a different refractive index from that of the light guide plate and is arranged along at least part of an edge of the light guide plate; the light guide structure is configured to allow a part of the light emitted by the light-emitting element to enter the edge region
Data Source
AI summary
A backlight assembly, a display panel and a display device are provided. the backlight assembly includes: a work region, a light-emitting element, a light guide plate and a light guide structure. The work region includes a center region and an edge region surrounding the center region; the light-emitting element is at least in the center region; the light guide plate is in the work region, and configured to conduct light emitted by the light-emitting element and allow the light to exit from the work region; and the light guide structure is at a side of the light guide plate close to the light-emitting element, and arranged along at least part of an edge of the light guide plate; the light guide structure is configured to allow a part of the light emitted by the light-emitting element to enter the edge region.