Backlight Assembly with Oblique Light Guide Plate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight assemblies for LCDs often suffer from uneven light distribution, leading to brighter areas and darker spots, which affect the overall luminance and image quality.
Innovation Solution
A backlight assembly featuring a light guide plate with obliquely cut corners and a light source unit comprising first and second light emitting members, along with a prism sheet configuration, ensures uniform light distribution across the display panel by optimizing the placement and angle of light emitting members and using diffuser and prism sheets to minimize light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light guide plate with straight edges is used, then the structure is simple and easy to manufacture, but the light distribution is uneven causing brighter areas and darker spots
Solution Approach 1:
The light guide plate incorporates cutting parts that remove portions of the plate, creating asymmetric features at specific locations. These cutting parts disrupt the symmetric light propagation paths that cause uneven distribution, allowing light from LEDs positioned at corners to reach previously dark areas more effectively, thereby improving overall light distribution uniformity
Solution Approach 2:
The cutting parts are strategically positioned at specific locations on the light guide plate where light distribution needs improvement. By modifying only these local areas rather than the entire plate structure, the design achieves better light uniformity while maintaining relative structural simplicity and manufacturability
2Illumination intensity
If light emitting members are positioned only at corner LEDs, then the structure is simple, but certain areas receive insufficient light causing dark spots
Solution Approach 1:
The light source unit is segmented into multiple light emitting members including corner LEDs and additional light emitting members positioned at other locations on the light guide plate. This segmentation allows different areas of the display device to be illuminated by dedicated light sources, ensuring comprehensive light coverage without requiring an overly complex unified structure
Solution Approach 2:
The light emitting members are arranged in a two-dimensional configuration on the light guide plate rather than being confined to corner positions only. This spatial arrangement in multiple dimensions enables light to be distributed across the entire display area more effectively, eliminating dark spots while maintaining a relatively simple overall 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
The solution achieves uniform light emission to all areas of the display panel, enhancing luminance consistency and image quality by ensuring that light is evenly distributed, reducing dark spots and improving overall brightness.
Implementation Method 1
a light guide plate (LOP) is used to distribute the generated light to provide a uniform luminance over the entire display panel
Implementation Method 2
a first prism sheet disposed on the light guide plate and a second prism sheet disposed on the first prism sheet
Implementation Method 3
a first diffuser sheet disposed between the light guide plate and the first prism sheet
Data Source
AI summary
A backlight assembly includes a light guide plate having at least five sides. There is a first side. A second side is parallel to and equal in length to the first side. A third side is perpendicular to the first and second sides. A fourth side is parallel to and shorter in length than the third side. There is at least one oblique side connecting the fourth side to the first or second side. The backlight assembly additionally includes a light source unit disposed the fourth side and the oblique side of the light guide plate.