Polycarbonate Optical Sheet for Display Light Efficiency
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Solution Overview
Problem
Existing display devices, such as liquid crystal televisions, face limitations in light use efficiency due to optical functional layers with light absorbing portions that can absorb effective light and cause moire interference fringes, affecting image quality.
Innovation Solution
A laminate comprising a polarizing plate and an optical sheet with a base material layer made of polycarbonate, featuring light transmissive portions and in-between portions arranged at specific angles to enhance light emission efficiency while minimizing light absorption and moire interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical functional layers with light absorbing portions are used to control light direction, then light direction control is improved, but light use efficiency deteriorates due to absorption of effective light
Solution Approach 1:
The patent converts the harmful light absorption effect into a beneficial function by strategically placing light absorbing portions only in regions where oblique light passes through. The light absorbing portions are positioned to absorb only the harmful oblique light that would cause moire interference, while allowing normal light to pass through to the liquid crystal panel, thus converting the harmful absorption effect into a selective filtering benefit
Solution Approach 2:
The patent applies local quality by creating non-uniform optical properties across the optical functional layer. The light absorbing portions are localized specifically in regions where oblique light passes through, while other regions maintain light transmissive properties. This local differentiation allows the layer to selectively control light based on its angle of incidence, improving both light direction control and light use efficiency
2Speed
If optical functional layers with stripe patterns are used to control light, then light direction is improved, but image quality deteriorates due to moire interference fringes
Solution Approach 1:
The patent converts the potentially harmful stripe pattern into a beneficial light filtering structure. By strategically positioning light absorbing portions within the stripe pattern, the patent causes the pattern to selectively absorb only oblique light that would create moire interference, while allowing normal light to pass through unaffected, thus converting the harmful moire-causing pattern into a beneficial selective filter
Solution Approach 2:
The patent applies local quality by creating spatially varying optical properties within the optical functional layer. The light absorbing portions are localized in specific regions where oblique light passes through, creating a non-uniform structure that selectively interacts with light based on its angle of incidence. This local differentiation eliminates moire interference while preserving image quality
3Speed
If light absorbing portions are added to optical functional layers, then light direction control is improved, but device complexity increases
Solution Approach 1:
The patent merges the light direction control function and the light absorption function into a single integrated optical functional layer. Rather than adding separate components for light direction control and light absorption, the patent combines these functions by incorporating light absorbing portions directly into the optical functional layer structure, thereby improving light direction control while minimizing the increase in device complexity
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 improves light use efficiency and image quality by effectively emitting appropriate light while absorbing light that causes defects, thereby enhancing the transmittance ratio and reducing moire interference.
Implementation Method 1
a polarizing plate; and an optical sheet arranged on one surface side of the polarizing plate
Implementation Method 2
the optical functional layer includes a plurality of light transmissive portions extending in one direction along a face of the base material layer, each having a predetermined cross section, and arrayed in a direction different from an extending direction thereof at predetermined intervals, and an in-between portion(s) formed in each of the intervals of adjacent light transmissive portions
Data Source
AI summary
A laminate including: a base material layer, an optical functional layer, and a polarizing plate; wherein the optical functional layer includes a plurality of light transmissive portions extending in one direction along a face of the base material layer, and arrayed in a direction different from an extending direction thereof, and an in-between portion(s) formed in the intervals of adjacent light transmissive portions, an angle formed by an extending direction of the transmission axis of the polarizing plate, and the extending direction of the light transmissive portions is 1° to 41.7° in a front view, the base material layer is formed of polycarbonate, and the average coefficient of linear expansion or the average linear expansion of the laminate is within a predetermined range.