Triangular Prism Optical Adjusting Member for LCD Backlight Luminance
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Solution Overview
Problem
Conventional backlight units for liquid crystal display devices face issues with color separation and insufficient luminance due to the use of single prism sheets, which require multiple optical sheet groups, increasing thickness and cost.
Innovation Solution
An optical adjusting member with a base member and linear members having approximately triangular sections, where the second sectional part reverses the color separation pattern of the first sectional part, allowing direct change in light direction and eliminating the need for additional diffusion sheets, thereby improving light efficiency and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single prism sheet is used to control light direction, then the device complexity is reduced, but color separation occurs and luminance is insufficient
Solution Approach 1:
The single optical sheet is segmented into multiple functional regions: a first region with a first refractive index and a second region with a second refractive index different from the first. This segmentation allows different parts of the sheet to handle different aspects of light control, achieving both color separation reduction and sufficient luminance enhancement with a single sheet rather than multiple stacked sheets.
Solution Approach 2:
Different regions of the optical sheet are assigned different local optical properties (different refractive indices) to perform specialized functions. The first region with its specific refractive index addresses one aspect of light control while the second region with its different refractive index addresses another aspect, allowing the system to achieve multiple objectives simultaneously within a single component.
2Illumination intensity
If multiple optical sheet groups are used to prevent color separation and enhance luminance, then the illumination quality is improved, but the thickness and cost of the device increase
Solution Approach 1:
Multiple optical functions that would traditionally require separate stacked sheets (diffusion, collimation, color separation control) are merged into a single optical sheet with spatially varying refractive indices. This integration achieves the same optical performance as multiple sheets while reducing the overall thickness and eliminating the need for separate diffusion sheets.
Solution Approach 2:
The single optical sheet with multiple regions of different refractive indices performs multiple functions simultaneously: it diffuses light, collimates light in specific directions, and controls color separation. This multi-functional design replaces what would traditionally require multiple specialized sheets, reducing device thickness while maintaining or improving optical performance.
3Illumination intensity
If multiple optical sheet groups are used to control light directivity, then the luminance is enhanced, but the manufacturing cost increases
Solution Approach 1:
Multiple optical functions are merged into a single manufacturable component with spatially varying refractive indices. This reduces the number of separate parts that need to be manufactured, aligned, and assembled, thereby reducing manufacturing complexity and cost while achieving the desired luminance enhancement.
Solution Approach 2:
The single optical sheet performs multiple functions (diffusion, collimation, color control) that would traditionally require multiple specialized components. This multi-functionality reduces the total component count and assembly requirements, leading to lower manufacturing costs despite the enhanced optical performance.
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 optical adjusting member effectively reduces color separation and enhances luminance by changing the light direction and eliminating the need for additional diffusion sheets, resulting in a thinner, cost-effective backlight unit.
Implementation Method 1
The traveling direction of light is controlled by taking advantage of the prism effect or lens effect provided by these optical members formed on the base member
Implementation Method 2
the use of a single prism sheet causes the color separation of light output from the prism sheet
Data Source
AI summary
An optical adjusting member according to the invention includes a base member having optical transparency and a plurality of linear members provided on the base member and having optical transparency. A section of the linear member orthogonal to the lengthwise direction of the linear member includes a triangular first sectional part defined by first to third sides and an approximately triangular second sectional part. The second sectional part has a smaller area than that of the first sectional part and defined by fourth to sixth sides. The first side of the first sectional part is in contact with the surface of the base member. The second sectional part is formed on the second side of the first sectional part, and the fourth side of the second sectional part is in contact with the second side of the first sectional part.