Reflecting Sheet Dot Areas for Display Light Uniformity
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Solution Overview
Problem
Existing backlight units for display devices face challenges in achieving uniform light reflection and distribution, leading to non-uniform brightness and potential issues with image quality.
Innovation Solution
The proposed backlight unit incorporates a reflecting sheet with a specific design, featuring a first sheet part with holes corresponding to light sources, a second sheet part with sequentially positioned dot areas, and a third sheet part on the sidewall. The dot areas have different dot sizes and spacings, and the reflecting sheet is fixed to a frame using pins, allowing for optimal light reflection and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflecting sheet is used without dot areas, then the structure is simple and easy to manufacture, but the light reflection is non-uniform causing brightness unevenness
Solution Approach 1:
The reflecting sheet incorporates dot areas with different sizes at different locations to create localized variations in light reflection. The first dot area has larger dots while the second dot area has smaller dots, allowing each region to control light reflection locally and achieve overall uniformity.
Solution Approach 2:
The reflecting sheet is divided into multiple functional regions: a first sheet part with holes for light sources, a second sheet part with dot areas for light reflection control, and a third sheet part on the sidewall. This segmentation allows each region to perform its specific function optimally.
2Illumination intensity
If dot areas with uniform dot sizes are used, then the manufacturing process is simple, but the light distribution remains non-uniform
Solution Approach 1:
Different regions of the reflecting sheet have dot areas with different dot sizes. The first dot area contains larger dots while the second dot area contains smaller dots, creating localized optical properties that compensate for light distribution variations and achieve overall uniformity.
3Loss of energy
If the reflecting sheet covers the entire surface including light source areas, then light reflection is maximized, but the light sources cannot be properly accessed or cooled
Solution Approach 1:
The reflecting sheet is segmented into distinct functional zones: the first sheet part with holes positioned over the light sources for accessibility and cooling, the second sheet part with dot areas for light reflection, and the third sheet part on the sidewall. This segmentation allows each region to fulfill its specific function without interfering with others.
Solution Approach 2:
Holes are extracted from the first sheet part at positions corresponding to the light sources, removing the reflecting material from those specific areas to allow light source access and thermal management while maintaining reflection functionality in other regions.
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
This design enhances light uniformity and reduces non-uniform brightness, resulting in improved image quality and a more consistent viewing experience for display devices.
Implementation Method 1
a reflecting sheet having a dot area... enhancing light uniformity and reduces non-uniform brightness
Data Source
AI summary
A display device including a display panel, a frame at a rear of the display panel, a light source on a substrate between the display panel and the frame, the light source providing light for the display panel, and a reflecting sheet between the display panel and the frame, the reflecting sheet having a rectangular shape with a first long side, a second long side opposite the first long side, a first short side adjacent to the first long side and the second long side, and a second short side opposite the first short side, wherein the reflecting sheet includes a first sheet part forming a central area of the reflecting sheet, a second sheet part forming a side area of the reflecting sheet around the first sheet part, the second sheet part including dot areas, and a hole next to a border line between the first sheet part and the second sheet part, wherein at least one of the dot areas in the second sheet part is formed along the first short side or the second short side, wherein the at least one of the dot areas including a first dot area next to the hole in a parallel direction of the first long side or the second long side and a second dot area next to the first dot area in a parallel direction of the first short side or the second short side, and wherein a density of dots in the first dot area is different from a density of dots in the second dot area.