Spacer in Insulating Layer Opening for LCD Alignment
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Solution Overview
Problem
In liquid crystal displays, the contact between alignment layers during panel bonding can lead to defects and light leakage, while spacers in opening regions decrease the aperture ratio, resulting in reduced transmittance and viewing angle.
Innovation Solution
A liquid crystal display design featuring a first and second substrate with overlapping electrodes, insulating layers, and spacers between photo-alignment layers on each substrate, preventing contact between alignment layers and maintaining a uniform distance, thereby reducing defects and enhancing transmittance and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alignment layers are disposed on both substrates facing each other, then the liquid crystal display can maintain structure and spacing, but contact between alignment layers causes defects and light leakage
Solution Approach 1:
A spacer is introduced as an intermediary component between the first alignment layer on the first substrate and the second alignment layer on the second substrate. The spacer prevents direct contact between the alignment layers while maintaining the structural integrity and spacing of the display device, thereby eliminating defects and light leakage caused by alignment layer contact.
2Manufacturing precision
If a spacer is disposed in an opening region to maintain distance between substrates, then substrate spacing is maintained, but aperture ratio decreases and transmittance is reduced
Solution Approach 1:
The spacer is strategically positioned in the opening region where the second insulating layer has a patterned structure. This local placement maintains the required substrate spacing and alignment precision while minimizing the impact on the overall aperture ratio, as the spacer occupies only the opening area rather than the entire substrate surface.
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 design effectively prevents alignment layer defects, increases transmittance, and achieves a wider viewing angle by maintaining the separation of alignment layers and optimizing the aperture ratio.
Implementation Method 1
a method in which the alignment layer includes a photoreactive material which is photo-aligned is proposed
Data Source
AI summary
Provided is a liquid crystal display, including: a first substrate; a first electrode and a second electrode disposed on the first substrate and overlapping with each other with a first insulating layer therebetween; a second insulating layer disposed on the first substrate and having an opening; a second substrate facing the first substrate; a first alignment layer disposed on the first substrate; a second alignment layer disposed on the second substrate; and a spacer disposed between the first alignment layer and the second alignment layer, in which the spacer is positioned in the opening.