Backlight Reflecting Sheet Dot Pattern Uniformity
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Solution Overview
Problem
Conventional backlight units for liquid crystal display panels suffer from non-uniform light distribution, leading to brightness inconsistencies across the display, which affects the overall viewing experience.
Innovation Solution
A backlight unit design featuring a reflecting sheet with a unique dot pattern and structure, including first and second sheet areas with varying dot sizes and densities, strategically positioned to optimize light reflection and distribution across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflecting sheet is used in the backlight unit, then the structure is simple and easy to manufacture, but the light distribution is non-uniform leading to brightness inconsistencies
Solution Approach 1:
The reflecting sheet is divided into multiple regions (first reflecting region, second reflecting region, third reflecting region) with different dot patterns. Each region has dots of different sizes, densities, or arrangements tailored to its specific location and light reflection requirements. This local differentiation enables uniform light distribution across the entire display panel while maintaining a relatively simple overall structure that can be manufactured using conventional techniques.
2Illumination intensity
If a uniform dot pattern is used across the entire reflecting sheet, then the manufacturing process is simple, but the light reflection is not optimized for different areas leading to brightness inconsistencies
Solution Approach 1:
The reflecting sheet is segmented into multiple distinct regions, each with its own optimized dot pattern. The first reflecting region has a first dot pattern, the second reflecting region has a second dot pattern, and the third reflecting region has a third dot pattern. This segmentation allows each region to be optimized for its specific function while maintaining compatibility with conventional manufacturing processes that can handle multi-region patterns.
3Illumination intensity
If the reflecting sheet has a simple flat structure, then it is easy to manufacture, but it cannot effectively control and distribute light uniformly across the display panel
Solution Approach 1:
The reflecting sheet incorporates dots that extend in multiple dimensions - not only in the plane of the sheet but also protruding toward the light source. This three-dimensional dot structure enables more effective light control and distribution. The dots can have different heights, widths, and spacing arrangements, creating a multi-dimensional light modulation effect that achieves uniform brightness without requiring a completely complex structural redesign.
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 design ensures uniform light reflection and distribution, reducing brightness inconsistencies and enhancing the visual experience by controlling light reflectance and density across the display.
Implementation Method 1
a reflecting sheet located on the at least one substrate... including first areas and second areas... a dot pattern in the first areas is different from a dot pattern in the second areas... to optimize light reflection and distribution
Data Source
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AI summary
A backlight unit (120) is discussed, which includes a frame (130) including a bottom (130a) and a sidewall (130b, 130c) extending from the bottom (130a); at least one substrate (122) located on the frame (130), and a plurality of light sources (124) mounted on the at least one substrate (122); and a reflecting sheet (126) located on the at least one substrate (122), wherein the reflecting sheet (126) includes: a first sheet part (126a) located on the bottom (130a), the first sheet part (126a) including a plurality of holes (235) corresponding to the plurality of the light sources (124); a second sheet part (126b) extended from the first sheet part (126a), the second sheet part (126b) including first areas (AR1) and second areas (Ar2); and a third sheet part (126c) extended from the second sheet part (126b) and located on the sidewall (130c), wherein the first areas (AR1) correspond to outermost holes (235) among the plurality of holes (235), and the second areas (AR2) are located between the first areas (AR1), wherein a dot pattern (DT) in the first areas (AR1) is different from a dot pattern (DT) in the second areas (AR2), wherein the dot pattern (DT) in at least one of the first areas (AR1) and the second areas (AR2) includes a plurality of dot areas (E, C, A) positioned sequentially in a direction from the first sheet part (126a) to the third sheet part (126c), the plurality of dot areas (DT) including first dot areas (E) and second dot areas (A), the first dot areas (E) including a plurality of dots (DT) having the same size and the second dot areas (A) including a plurality of dots (DT) having the same size, and wherein the size of the plurality of dots (DT) in the first dot areas (E) is different from the size of the plurality of dots (DT) in the second dot areas (A).