Reflective LCD Film with Randomized Convex-Concave Pattern
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Solution Overview
Problem
Conventional reflective LCD devices suffer from rainbow color issues due to the periodic convex and concave patterns of the reflective film, which degrade image quality and contrast ratio, and existing solutions are insufficient in achieving the required image quality.
Innovation Solution
A reflective LCD device with a convex and concave pattern on the reflective film, where the apexes of figure elements are randomly shifted within a maximum shift amount of 0.4, resulting in a discrete angle of bright spots of 0.01 degrees or smaller, effectively suppressing rainbow color by diffraction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a periodic convex and concave pattern is formed on the reflective film to improve light reflection, then the brightness and image quality are improved, but rainbow color appears due to light interference
Solution Approach 1:
The patent applies asymmetry by randomly shifting the apexes of figure elements within a maximum shift amount of 0.4, breaking the periodic symmetry of the convex and concave pattern. This randomization prevents regular light interference patterns while preserving the overall reflective function, thereby eliminating rainbow color without sacrificing brightness.
Solution Approach 2:
The patent changes the geometric parameters of the reflective film pattern by introducing random shifts to the apex positions of figure elements. This parameter modification transforms the periodic structure into a randomized structure, controlling the diffraction angle to 0.01 degrees or smaller and suppressing rainbow color while maintaining reflective performance.
2Object-generated harmful factors
If a bead adhesive layer is added to suppress rainbow color, then chromatic dispersion is reduced, but contrast ratio degrades due to noise light reflection
Solution Approach 1:
The patent extracts and eliminates the need for bead adhesive layers by directly modifying the reflective film pattern itself. The random shift of apexes in the figure elements provides sufficient rainbow color suppression without requiring additional adhesive layers, thereby avoiding the contrast ratio degradation that would result from such layers.
Solution Approach 2:
The patent converts the potentially harmful periodic pattern into a beneficial randomized pattern. By intentionally introducing random shifts to the apexes, the design transforms what would be a source of interference into a solution that suppresses rainbow color while maintaining high contrast ratio, eliminating the need for separate bead adhesive layers.
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 effectively suppresses rainbow color and enhances image quality by minimizing chromatic dispersion, maintaining a high contrast ratio without the need for additional bead adhesive layers.
Implementation Method 1
a reflective film for reflecting incident light transmitted through the LC layer to allow the incident light to again pass through the LC layer
Implementation Method 2
the random shift of apexes in each figure element allows a discrete angle α of bright spots defined by: α=(λA/Ls×N)·(180/π) to assume 0.01 degrees or smaller, the bright spots occurring due to diffraction of the incident light reflected by the reflective film
Data Source
AI summary
A reflective LCD device includes a reflective film having a convex and concave pattern, wherein the convex and concave pattern includes a plurality of pattern groups having a common pattern and each including a plurality of (N) figure elements. Each figure element is obtained by randomizing a corresponding figure element in a standard pattern including a plurality of standard figure elements. In the randomization, the discrete angle of bright spots generated by diffraction of the reflected incident light assumes 0.01 degrees or smaller. The discrete angle α of the bright spots is defined by:α=(λA/Ls×N)·(180/π)where λA and Ls are average wavelength of the incident light and pitch of the standard pattern, respectively.