Stacked LCD Light Shield Layout for Dark Area and Moiré Suppression
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Solution Overview
Problem
Existing liquid crystal display devices with stacked panels suffer from display inconsistencies due to light blocking elements, such as TFTs, causing dark areas that are noticeable to observers, and spatial frequency interference leading to moiré patterns.
Innovation Solution
The liquid crystal display device incorporates a first liquid crystal panel with color display elements and a second liquid crystal panel with monochrome display elements, utilizing light blocking patterns and light shields to minimize light interference and align switching elements with wider spacings, thereby reducing the visibility of dark areas and moiré patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If switching elements are arranged at wide intervals to drive multiple subpixels, then device complexity is reduced, but light blocking creates visible dark areas that are perceived as display inconsistencies
Solution Approach 1:
A light shield structure is introduced as an intermediary element between the switching element and the subpixel. This light shield acts as a mediator that blocks light from reaching the subpixel, preventing the switching element's light blocking effect from being visible to the observer, thus resolving the contradiction between simple switching element arrangement and visible dark areas
Solution Approach 2:
The light blocking function is extracted from the switching element and transferred to a dedicated light shield structure. By separating these functions, the switching element can be arranged at wide intervals for simplicity while the light shield handles the light blocking to prevent visible dark areas
2Device complexity
If switching elements block light at wide intervals, then the structure is simpler, but dark areas caused by switching elements stand out and are recognized as display inconsistencies
Solution Approach 1:
The light shield serves as a mediator that intercepts light before it can be blocked by the switching element. This intermediary structure ensures uniform light distribution across the subpixel, preventing the formation of visible dark areas and maintaining display consistency while keeping the overall structure simple
3Adaptability or versatility
If the second liquid crystal display panel displays monochrome content, then moiré patterns are more noticeable, but color display panels cannot effectively suppress moiré
Solution Approach 1:
The light blocking patterns and light shields are replicated across multiple subpixels in a systematic arrangement. This copying of the light blocking structure across the entire panel creates a consistent pattern that disrupts moiré formation, effectively suppressing moiré visibility even when monochrome content is displayed
Data Source
AI summary
A liquid crystal display device includes a first liquid crystal display panel and a second liquid crystal display panel. The second liquid crystal display panel includes a switching element having light blocking properties, a first light blocking pattern extending in a first direction and having light blocking properties, a second light blocking pattern extending in a second direction and having light blocking properties, and a plurality of light shields having light blocking properties. The first light blocking pattern includes a first light blocking line and a second light blocking line. The light shield is located between a crossline and a symmetry axis within a region in which a spacing between the first light blocking line and the second light blocking line is continuously widen from both ends of the region in the first direction.