Optical Film Pitch Layout to Suppress Display Moire and Diffraction
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Solution Overview
Problem
Display devices suffer from issues such as moire and image blurring due to the interaction between display panels and optical films, which degrade image quality and viewability.
Innovation Solution
The display device incorporates an optical film with first and second optical functional parts having different optical performances, arrayed at specific pitches and distances relative to the pixel array, ensuring that the functional part array pitches are less than half the pixel array pitches and the distance between the pixel and film surfaces satisfies certain refractive conditions to minimize moire and diffraction effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an optical film is placed over a display panel to improve display quality, then image quality is improved, but moire occurs due to the overlap of regular pitch patterns
Solution Approach 1:
The patent applies asymmetry by using irregular pitch arrangements for both the pixel array and the optical functional parts. Specifically, the pitch between adjacent pixels varies in different directions, and the pitch between adjacent optical functional parts also varies. This asymmetric, non-uniform pitch distribution prevents the formation of regular interference patterns, thereby suppressing moire while maintaining display quality enhancement.
2Manufacturing precision
If an optical film with regular pitch array is used to improve display quality, then optical performance is improved, but image blurring occurs due to diffraction
Solution Approach 1:
The patent employs asymmetry by designing the optical functional parts with irregular pitch distributions. The pitch between adjacent optical functional parts varies in different directions and positions, which disrupts the regular diffraction patterns that cause image blurring. This non-uniform arrangement allows the optical film to maintain its performance while reducing diffraction-induced blurring.
3Ease of manufacture
If pixels are arrayed at regular pitches to ensure manufacturing simplicity, then ease of manufacture is improved, but moire and diffraction effects are enhanced
Solution Approach 1:
The patent applies asymmetry by implementing irregular pitch arrangements for both the pixel array and optical functional parts. The pitch between adjacent elements varies in different directions, creating an asymmetric pattern that suppresses moire and diffraction effects while remaining manufacturable through standard photolithography processes with appropriate mask designs.
4Device complexity
If optical functional parts are arrayed at regular pitches to simplify design, then device complexity is reduced, but viewability is impaired by moire and diffraction
Solution Approach 1:
The patent applies asymmetry by using irregular pitch arrangements for the optical functional parts. The pitch between adjacent optical functional parts varies in different directions and positions, which suppresses moire and diffraction effects. This asymmetric design maintains reasonable complexity while significantly improving viewability and reducing image quality degradation.
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 effectively prevents the viewability of the display image from being impaired by moire and diffraction, enhancing overall image quality.
Implementation Method 1
that d (μm) denotes a distance in a face-to-face direction between surfaces of the pixels that face the optical film and a surface of the optical film that faces the pixels, q≤0.5p and tan(asin(0.7/q))
Implementation Method 2
image blurring attributed to diffraction may occur
Data Source
AI summary
A display device includes a display panel that emits light from a plurality of pixels arrayed at predetermined pixel array pitches and an optical film, placed over the display panel so as to allow passage of light from the plurality of pixels, that includes first and second optical functional parts differing in optical performance from each other. The first and second optical functional parts are arrayed at predetermined functional part array pitches. Assuming that p (μm) denotes the pixel array pitches, that q (μm) denotes the functional part array pitches, and that d (μm) denotes a distance in a face-to-face direction between surfaces of the pixels that face the optical film and a surface of the optical film that faces the pixels, q≤0.5p and tan(asin(0.7/q))<p/d hold.