LCD Spacer Position Limiting Structures
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels experience misalignment between substrates due to spacer displacement under pressure or stress, leading to light leakage and compromised display quality, especially around scan lines where strong electric fields cause chaotic liquid crystal molecule tilt.
Innovation Solution
Incorporating position limiting structures on the active device array substrate, comprising first and second position limiting patterns that restrict spacer displacement along specific azimuth ranges, preventing misalignment between substrates and thus minimizing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photo spacers are disposed around the scan lines of the black matrix to maintain cell gap, then the cell gap is maintained and liquid crystal layer thickness is controlled, but under stress or pressure, relative displacement between substrates occurs causing light leakage and movable mura phenomenon
Solution Approach 1:
The position limiting structure is divided into multiple patterns (first position limiting pattern and second position limiting pattern) that work together to constrain spacer displacement in different directions, preventing substrate misalignment while maintaining cell gap
Solution Approach 2:
The position limiting structures are pre-formed on the substrates before assembly, creating predetermined constraints that limit spacer displacement from the outset, preventing light leakage before it can occur under stress
2Manufacturing precision
If spacers are used to maintain cell gap, then liquid crystal layer thickness is controlled, but spacers can displace under pressure causing misalignment between substrates
Solution Approach 1:
The first and second position limiting patterns are configured with different orientations and azimuth ranges, creating asymmetric constraints that collectively prevent spacer displacement in all directions, enhancing position stability
Solution Approach 2:
The position limiting structures act as intermediary elements between the spacers and substrates, providing mechanical constraints that stabilize spacer position without interfering with the spacers' primary function of maintaining cell gap
3Object-affected harmful factors
If black matrix is used to shield light, then light leakage is prevented, but relative displacement between substrates causes light originally shielded by black matrix to leak
Solution Approach 1:
The position limiting structures create preliminary constraints that prevent the relative displacement which would cause light leakage, acting in advance to counteract the harmful effect before it can manifest under stress
Data Source
AI summary
A liquid crystal display panel including an active device array substrate, an opposite substrate, a plurality of spacers and a liquid crystal layer is provided. The active device array substrate includes a plurality of position limiting structures, each including a first and a second position limiting pattern. The opposite substrate is disposed above the active device array substrate. The spacers are disposed on the opposite substrate, and the spacers are protruded towards the active device array substrate and extended adjacent to the first and second position limiting patterns. Displacement of each spacer is limited by the first or second position limiting pattern. The first position limiting patterns limit the displacement of a portion of the spacers along a first azimuth range, the second position limiting patterns limit the displacement of a portion of the spacers along a second azimuth range, and the first and second azimuth ranges are different.