Optical Fiber Assembly with Adhesive Blocks for High Color Gamut Displays
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high color gamut due to the high cost and complex structure of quantum dot technology, which is necessary for meeting the demands of new color gamut standards like Rec.2020.
Innovation Solution
An optical assembly with a simple structure and low cost is introduced, comprising a first substrate layer, a second substrate layer, and an optical fiber layer with adhesive blocks that inhibit total internal reflection, allowing for uniform light output and high color gamut display. This assembly is integrated into a liquid crystal display device with an RGB tri-color laser light source, optical coupler, and light splitter to ensure each optical fiber corresponds to sub-pixels, optimizing alignment and reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dot technology is applied to improve color gamut, then color gamut value is improved, but cost and structure complexity increase
Solution Approach 1:
The patent extracts the light extraction function from the bulk optical fiber and concentrates it at specific locations (contact regions with adhesive blocks or substrate surfaces). By taking out the light extraction function from the entire fiber and locating it at discrete points, the system achieves efficient light coupling to sub-pixels while maintaining simple optical fiber structure and reducing overall system complexity.
Solution Approach 2:
The patent introduces adhesive blocks as intermediary elements between optical fibers and substrate. These adhesive blocks with specific refractive indices serve as mediators to control light extraction - they can either inhibit total internal reflection to enable light output or provide controlled extraction. This intermediary approach simplifies the optical design compared to direct fiber-to-pixel coupling while achieving high color gamut.
2Illumination intensity
If adhesive blocks are used to inhibit total internal reflection, then light output uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by positioning adhesive blocks with specific refractive indices only at contact regions where light extraction is needed, rather than modifying the entire optical fiber or substrate uniformly. This localized approach enables precise control of light output uniformity at each sub-pixel location while keeping the rest of the structure simple and easy to manufacture.
Solution Approach 2:
The patent utilizes parameter changes by selecting adhesive blocks with different refractive indices (higher than, equal to, or between optical fiber and air refractive indices) to control light extraction behavior. By changing the refractive index parameter of the adhesive material, the system can inhibit or permit total internal reflection as needed, achieving uniform light output without complex manufacturing processes.
3Illumination intensity
If optical fibers are precisely aligned with sub-pixels, then color gamut and transmittance are improved, but alignment precision requirements increase
Solution Approach 1:
The patent segments the light extraction function into discrete contact regions at specific locations along the optical fiber, corresponding to individual sub-pixels. This segmentation allows each optical fiber to be independently aligned with its target sub-pixel, improving transmittance and color gamut while making the alignment process more manageable through localized positioning rather than requiring perfect alignment across the entire display.
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 a high color gamut display with improved transmittance and reduced energy consumption, potentially eliminating the need for a color film layer by ensuring precise alignment of optical fibers with sub-pixels, thereby enhancing the overall performance and efficiency of the liquid crystal display device.
Implementation Method 1
At the contact regions between the adhesive blocks and the plurality of optical fibers, total internal reflection in the optical fibers is inhibited by the adhesive blocks
Data Source
AI summary
The embodiments of the present disclosure provide an optical assembly and a liquid crystal display device using the optical assembly. The optical assembly has a simple structure and low cost, and can realize a high color gamut display. The optical assembly comprises a first substrate layer, a second substrate layer, and an optical fiber layer arranged between the first substrate layer and the second substrate layer. The optical fiber layer is composed of a plurality of optical fibers arranged closely in a single layer. A plurality of adhesive blocks in contact with the plurality of optical fibers are arranged on a surface of at least one of the first substrate layer and the second substrate layer. At the contact regions between the adhesive blocks and the plurality of optical fibers, total internal reflection in the optical fibers is inhibited by the adhesive blocks.