Lens Array Refractive Index Contrast for Display Brightness
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Solution Overview
Problem
Conventional display devices face challenges in achieving high brightness and contrast due to limitations in light collection and distribution across pixels.
Innovation Solution
The display device incorporates a lens array with lenses having a higher refractive index than the insulating layer, focusing light emitted from an illumination device onto a liquid crystal layer between substrates, ensuring high luminance and precise light modulation across subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lens array is used to collect light on a pixel-by-pixel basis to achieve high brightness, then brightness is improved, but light distribution uniformity deteriorates
Solution Approach 1:
A light distribution film is introduced as an intermediary component between the lens array and the liquid crystal layer. This film receives the focused light from the lens array and redistributes it uniformly across the pixel region, thereby maintaining high brightness while achieving uniform light distribution. The light distribution film acts as a mediator that balances the concentrated light output from the lenses with the uniform illumination requirements of the display panel.
2Illumination intensity
If lenses with higher refractive index than the insulating layer are used, then light focusing capability is improved, but manufacturing complexity increases
Solution Approach 1:
The refractive index parameter of the lens material is specifically selected to be higher than that of the insulating layer. This parameter change optimizes the light focusing capability of the lenses by creating a greater refractive index difference, which enhances light bending and focusing efficiency. By carefully controlling this material parameter, the patent achieves superior light concentration without requiring overly complex lens structures.
3Illumination intensity
If light is focused on regions of high liquid crystal modulation, then contrast ratio is improved, but alignment precision requirements increase
Solution Approach 1:
The optical system is segmented into distinct functional components: the lens array for light focusing, the light distribution film for uniformity, and the liquid crystal layer for modulation. Each component is optimized for its specific function, and their collective arrangement ensures that focused light is delivered to the high-modulation regions of the liquid crystal layer. This segmentation allows each component to be manufactured and aligned with relaxed individual tolerances while achieving high overall contrast ratio.
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 configuration enhances brightness and contrast by focusing light on regions of high liquid crystal modulation, effectively addressing the limitations of existing technologies in light distribution and image quality.
Implementation Method 1
a lens array including a plurality of lenses; wherein the plurality of lenses have a refractive index higher than that of the insulating layer
Implementation Method 2
focusing light emitted from an illumination device onto a liquid crystal layer between substrates
Data Source
AI summary
According to one embodiment, a display device includes a first substrate including a plurality of switching elements, a plurality of signal lines connected to the plurality of switching elements, respectively, a plurality of color filters each provided between each adjacent pair of the plurality of signal lines, and a plurality of metal layers opposing the plurality of signal lines, respectively, a second substrate including a lens array including a plurality of lenses, and an insulating layer that covers the lens arrays, and a liquid crystal layer provided between the first substrate and the second substrate, wherein the plurality of lenses have a refractive index higher than that of the insulating layer.