Irregular Black Strips for 3D Display Cross-Talk and Moiré Reduction
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Solution Overview
Problem
Patterned retarder type 3D displays experience cross-talk issues at wide view angles due to the regular linear pattern of black strips, leading to moiré phenomena and reduced brightness when attempting to widen the black matrix to prevent cross-talk.
Innovation Solution
The introduction of irregularly disposed black strips between unit pixels, with auxiliary black strips and misaligned outer lines, breaks the regularity of the pattern to prevent moiré and cross-talk without reducing the aperture ratio or brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular linear black strips are used to prevent cross-talk, then cross-talk is reduced, but moiré phenomena occur and view angle is limited
Solution Approach 1:
The patent applies asymmetry by using irregularly shaped black strips with varying widths and positions instead of uniform linear strips. The black strips have different shapes (some wider, some narrower, some with curved edges) arranged in an irregular pattern, which breaks the periodicity that causes moiré effects while maintaining the cross-talk prevention function through strategic placement between pixel regions.
Solution Approach 2:
The patent implements local quality by varying the properties of black strips at different locations. Each black strip can have different width, shape, and position optimized for its specific location in the display. This allows the black strips to effectively block cross-talk in different regions while the overall irregular distribution prevents moiré phenomena across the entire display area.
2Reliability
If black matrix width is increased to prevent cross-talk, then cross-talk is reduced, but aperture ratio decreases and brightness is reduced
Solution Approach 1:
The patent uses local quality by implementing black strips with non-uniform widths positioned strategically between pixel regions. Rather than uniformly increasing the black matrix width across the entire display, the black strips are concentrated where needed for cross-talk prevention, allowing most of the pixel area to remain active and maintain high aperture ratio and brightness.
Solution Approach 2:
The patent applies segmentation by dividing the black matrix into discrete, localized black strips positioned between specific pixel regions rather than using a continuous wide black matrix. This segmentation allows cross-talk prevention to be achieved in targeted areas while preserving the aperture ratio and brightness of the remaining pixel areas.
3Ease of manufacture
If regular linear black strips are used, then manufacturing is simplified, but view angle range is limited due to cross-talk
Solution Approach 1:
The patent applies asymmetry by using irregularly shaped and positioned black strips that can be fabricated using standard photolithography processes. The irregular pattern is defined by varying the width and position of black strips in different regions, which can be achieved through conventional manufacturing techniques while effectively preventing cross-talk at wide view angles.
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 solution effectively prevents 3D cross-talk and moiré phenomena across a wider view angle range without compromising aperture ratio or front brightness, enhancing the overall quality of the 3D display.
Implementation Method 1
The first retarder RT1 can transmit the first circular polarized light by retarding the phase of the light with +λ/4 (here, 'λ' is the wavelength of the light incident from the pixel array). The second retarder RT2 can transmit the second circular polarized light by retarding the phase of the light with −λ/4
Implementation Method 2
The first polarizing filter P1 has the same light polarization characteristic with that of the first retarder RT1 of the patterned retarder PR. At the same time, the second polarizing filter P2 has the same light transmitting axis with that of the second retarder RT2
Data Source
AI summary
A patterned retarder type 3D display includes a display panel including a plurality of unit pixels disposed in a matrix manner and a black matrix, a patterned retarder including a plurality of unit retarder patterns disposed at every row of the plurality of the unit pixels and located in front of the display panel, and a black strip including a main strip disposed as to be overlapped with the black matrix, the black strip being disposed between two unit pixels neighboring in a vertical direction and having a width expanded in any one direction of an upside direction and a down side direction from a border line of the unit retarder pattern, wherein outer lines of the black strips disposed at the each unit pixel are irregularly disposed, wherein the main strip extends in a horizontal direction.