Optical Sheet Protrusions for Image Light Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image display units, such as plasma displays, face issues with low use efficiency of image light due to excessive absorption by optical functional layers, leading to inadequate contrast and brightness, particularly when external light is not effectively shielded and transmissivity is not optimized within the desired view angle range.
Innovation Solution
An image source unit comprising an optical sheet with a base material layer and an optical functional layer featuring light-transmissive and light-absorbing portions, where the light-transmissive portions have protrusions and the light-absorbing portions have recesses, along with an adhesive layer and additional layers for enhanced light control, such as an electromagnetic wave shielding layer and wavelength filter layer, to improve light transmission and absorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an optical functional layer with light-absorbing portions is provided to improve contrast, then external light shielding is enhanced, but image light use efficiency deteriorates due to excessive absorption
Solution Approach 1:
The optical functional layer is designed with spatially differentiated properties: light-transmissive portions for forward light transmission and light-absorbing portions for external light shielding. Each region has optimized local characteristics to perform its specific function effectively without compromising overall light efficiency.
Solution Approach 2:
The optical functional layer is segmented into distinct light-transmissive portions and light-absorbing portions arranged in an alternating pattern. This segmentation allows independent optimization of each region's optical properties to balance external light shielding with image light transmission efficiency.
2Object-affected harmful factors
If light-absorbing portions are increased to improve contrast, then external light shielding is enhanced, but transmissivity within view angle range deteriorates
Solution Approach 1:
Different regions of the optical functional layer have different optical qualities: light-transmissive portions are optimized for high transmissivity within the view angle range, while light-absorbing portions are optimized for external light shielding. This local quality differentiation resolves the contradiction between transmissivity and external light shielding.
3Loss of energy
If image light is converged at the front to improve use efficiency, then power consumption is reduced, but contrast improvement is compromised
Solution Approach 1:
The optical functional layer segments light paths into different destinations: light-transmissive portions guide image light forward to reduce power consumption, while light-absorbing portions manage external light to maintain contrast. This segmentation allows simultaneous optimization of both objectives.
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 enhances the use efficiency of image light by reducing absorption in the light-absorbing portions, improving contrast and brightness while maintaining effective external light shielding and transmissivity within the desired view angle range, thereby improving the overall performance of the image display unit.
Implementation Method 1
The optical functional layer has light-transmissive portions and light-absorbing portions and can adequately shield the external light
Implementation Method 2
the image light source side face of the light-transmissive portion has protrusions and the image light source side face of the light-absorbing portion has a recess
Data Source
AI summary
The present invention is to provide an image source unit for improving use efficiency of the image light and also provide an image display unit comprising the image source unit.The image source unit 4 comprising: an image light source 5; and an optical sheet 10 laminated on the image light source, the optical sheet comprising: a base material layer 11; and an optical functional layer 12 formed on the image light source side surface of the base material layer, the optical functional layer comprising: light-transmissive portions 13 arranged parallel along the sheet face; and light-absorbing portion(s) 14 arranged between the light-transmissive portions, the image light source side face of the light-transmissive portion having protrusions 17 each having a curved or polygonal line so that the protrusions project towards the image light source side in cross section in the sheet-thickness direction.