Backlight Assembly Optical Correcting Portions Luminance Uniformity
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Solution Overview
Problem
The existing backlight assemblies for liquid crystal display (LCD) devices suffer from luminance non-uniformity due to the reduction in light emission angle as light passes from LEDs to a light guiding plate, resulting in hot spots and uneven illumination.
Innovation Solution
The proposed solution involves a light guiding plate with optical correcting portions, such as protrusions, reflective sheets, and diffusion patterns, to alter the light path and enhance luminance uniformity by diffusing light and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light is emitted from LEDs directly to the light guiding plate, then the backlight assembly structure is simple, but luminance uniformity deteriorates due to hot spots
Solution Approach 1:
The light guiding plate incorporates optical correcting portions (protrusions, reflective sheets, diffusion patterns) at specific locations to modify light distribution locally. These localized optical features redirect and diffuse light from LED hot spots, creating uniform luminance across the display area while maintaining overall structural simplicity
Solution Approach 2:
The optical correcting portions act as intermediary elements between the LEDs and the light guiding plate. These intermediaries modify the light path by reflecting, refracting, and diffusing light, thereby transforming the non-uniform LED output into uniform illumination without requiring complex additional components
2Illumination intensity
If optical correcting portions are added to the light guiding plate, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
Multiple optical functions (light reflection, refraction, and diffusion) are merged into a single integrated light guiding plate structure. The optical correcting portions are formed as integral features of the light guiding plate rather than separate components, simplifying manufacturing and assembly while achieving luminance uniformity
Solution Approach 2:
The light guiding plate serves multiple functions simultaneously: it guides light from LEDs, corrects optical path deviations, diffuses light distribution, and maintains structural support. The optical correcting portions enable the plate to perform multiple optical correction functions (reflection, refraction, diffusion) in a single component
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 addresses the issue of luminance non-uniformity by scattering light to uniform areas, reducing hot spots, and enhancing heat dissipation, resulting in improved luminance distribution and efficiency.
Implementation Method 1
optical correcting portions formed on a side of the light guiding plate and spaced apart from each other by a predetermined distance to change the optical path
Implementation Method 2
The solution effectively addresses the issue of luminance non-uniformity by scattering light to uniform areas, reducing hot spots
Data Source
AI summary
A backlight assembly includes a plurality of light emitting diodes (LEDs), a light guiding plate disposed on the same plane as the LEDs, and a plurality of optical correcting portions formed on a side of the light guiding plate and spaced apart from each other by a predetermined distance to change an optical path.