Light Shielding Member Width Offset Prevents Moire
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Solution Overview
Problem
Moire patterns occur in display devices due to the overlapping of light shielding units with different spatial frequencies, which are not adequately addressed by existing technologies that do not consider the relationship between the size of through holes, pixel openings, and the distance between light shielding members.
Innovation Solution
A display device design featuring a first light shielding member with light output regions and surrounding non-openings in a lattice shape, and a second light shielding member with openings and non-openings arranged in the Y-axis direction, where the second non-opening covers the first non-opening closer to the observation point, and specific width and distance relationships are established to prevent moire patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light shielding units are arranged in a lattice shape with the same cycle and width, then the structure is simple and manufacturing is easy, but moire patterns occur due to overlapping at different observation positions
Solution Approach 1:
The patent applies local quality by making the second non-openings have a larger width than the first non-openings at corresponding positions. This local dimensional difference creates an offset in spatial frequency that prevents moire patterns while maintaining the overall lattice structure. The selective widening of specific shielding regions allows the system to eliminate visual interference without completely redesigning the lattice architecture.
2Object-affected harmful factors
If the pitch of through holes is reduced to one third or less of pixel pitch, then moire is prevented according to prior art, but the relationship between through hole size, opening size, and distance between light shielding members is not considered, resulting in insufficient moire prevention
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between the widths of first and second non-openings, and between the distance between light shielding members and the observation point. Instead of simply reducing pitch, the invention adjusts multiple parameters (widths W1Y, W2Y and distance ΔLY) to satisfy the condition (W1Y−W2Y)/2>ΔLY, which prevents moire patterns while accommodating practical manufacturing constraints.
3Object-affected harmful factors
If the width of second non-openings is increased to cover first non-openings completely, then moire patterns are prevented, but the light shielding area increases and may reduce display brightness
Solution Approach 1:
The patent applies partial action by having the second non-openings cover only the necessary portions of the first non-openings that contribute to moire patterns, rather than completely blocking all light. The width relationship (W1Y−W2Y)/2>ΔLY ensures sufficient coverage to prevent moire while minimizing the light shielding area, thus balancing pattern elimination with brightness maintenance.
Data Source
AI summary
In a display device in which a light shielding member having an opening formed in an image display surface of a display is arranged, occurrence of moire is prevented. A width (W1Y) of a first opening (OP1) in a first light shielding member (13) of a display (10) and a width (W2Y) of a second opening (OP2) of a second light shielding member (20) on a surface of the display (10) are set so that (W1Y−W2Y)/2>ΔLY is established.