Prismatic Condensing Layers for Moiré Fringe Reduction
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Solution Overview
Problem
The degradation of display quality in liquid crystal display devices due to the occurrence of moiré fringes, which is exacerbated by the reduction in pixel arrangement pitch and the increased precision of liquid crystal display devices, leading to higher costs and reduced brightness when using condensing sheets with fine optical structures.
Innovation Solution
An electro-optical device with a first and second condensing layer having different optical structural periods, where the first condensing layer is positioned farther from the electro-optical panel than the second, mitigating the contrast state caused by the first optical structural period and reducing the frequency and strength of moiré fringes without degrading display brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If condensing sheets with fine optical structures are used to reduce moiré fringes, then display quality is improved, but manufacturing cost increases and brightness decreases
Solution Approach 1:
The patent divides the condensing function into two separate layers: a first condensing layer with a first optical structural period and a second condensing layer with a second optical structural period. This segmentation allows each layer to have optimized periodicity that prevents moiré fringes while maintaining brightness, as neither layer needs to use excessively fine structures alone.
Solution Approach 2:
The patent applies different optical structural periods to different condensing layers based on their local requirements. The first condensing layer uses a first optical structural period optimized for its position, while the second condensing layer uses a second optical structural period optimized for its position, allowing each layer to perform its condensing function effectively without causing moiré fringes.
2Manufacturing precision
If condensing sheets with fine optical structures are used to reduce moiré fringes, then display quality is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the condensing function into two layers with different optical structural periods, the patent avoids the need to manufacture a single layer with extremely fine structures, which would be costly and difficult. Each layer can be manufactured with more reasonable precision requirements.
Solution Approach 2:
The patent changes the optical structural period parameter between the two condensing layers. The first condensing layer has a first optical structural period while the second condensing layer has a second optical structural period that is different from the first, allowing optimization of manufacturing parameters to reduce cost while maintaining display quality.
3Manufacturing precision
If the optical structural period of condensing sheets is reduced to prevent moiré fringes, then display quality is improved, but the rate of increase in brightness decreases
Solution Approach 1:
The patent segments the brightness enhancement function across two condensing layers. Each layer contributes to brightness enhancement through its own optical structural period, so the system achieves high brightness enhancement without requiring either layer to use extremely fine structures that would reduce the effectiveness of light condensing.
Solution Approach 2:
The patent optimizes the optical structural period parameters of the two condensing layers to achieve the best balance between preventing moiré fringes and maximizing brightness enhancement. By adjusting these parameters, the patent ensures that the rate of increase in brightness remains high while display quality is maintained.
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
Prevents the occurrence and strengthens of moiré fringes, maintaining display quality and brightness by optimizing the arrangement of condensing layers relative to the pixel arrangement periods, reducing the likelihood and impact of moiré fringes.
Implementation Method 1
a plurality of condensing structures, more specifically, prism structures 6a and 7a made of hill-shaped or V-groove-shaped surface structures are periodically formed
Implementation Method 2
In order to collect the emitted light from the backlight 4 to the viewer's side, a plurality of condensing structures
Implementation Method 3
a stripe-shaped contrast unevenness having a strong modulation degree (hereinafter, referred to as the 'moiré fringes') may occur
Implementation Method 4
based on the relationship between the optical structural periods of the condensing sheets 6 and 7 and the arrangement period of the pixels in the liquid crystal display panel 2, a stripe-shaped contrast unevenness having a strong modulation degree (hereinafter, referred to as the 'moiré fringes') may occur
Data Source
AI summary
An electro-optical device includes: an electro-optical panel that includes a plurality of pixels each of which is equipped with a light transmissive region are arranged along a plane, the light transmissive regions being formed with a first arrangement period in a first direction in the plane, and being formed with a second arrangement period, which is larger than the first arrangement period, in a second direction in the plane that is orthogonal to the first direction; a backlight that illuminates a light beam to the electro-optical panel; a first condensing layer that is disposed between the electro-optical panel and the backlight and has a first optical structural period substantially along the first direction; and a second condensing layer that is disposed between the electro-optical panel and the first condensing layer and has a second optical structural period substantially along the second direction. In the electro-optical device, the ratio of the first arrangement period to the first optical structural period is smaller than the ratio of the second arrangement period to the second optical structural period.