LCD Non-Display Area Organic Layer Protrusion for Substrate Alignment
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Solution Overview
Problem
In liquid-crystal display (LCD) devices with a black column spacer structure, misalignment during substrate coupling can cause the array substrate to adhere to the opposing substrate, preventing proper spreading of liquid crystals in the non-display area, resulting in visible empty spaces.
Innovation Solution
Incorporating an organic layer with protruding portions in the non-display area and a light-blocking pattern featuring a step that overlaps the protruding portion, which supports the opposing substrate during coupling, maintaining the gap between substrates and allowing liquid crystals to spread properly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opposing substrate is pressed down toward the array substrate during coupling, then the substrates adhere together, but liquid crystals cannot spread properly in the non-display area causing empty spaces
Solution Approach 1:
The protruding portion is formed on the organic layer before substrate coupling, creating a preliminary support structure that prevents excessive pressure application to the liquid crystal layer during the subsequent coupling process, thereby maintaining liquid crystal spreading uniformity while ensuring substrate adhesion
Solution Approach 2:
The protruding portion acts as an intermediary element between the organic layer and the opposing substrate, distributing the pressing force and preventing direct excessive contact that would cause liquid crystal spreading defects, thus resolving the contradiction between coupling reliability and manufacturing precision
2Measurement precision
If a black column spacer structure is used to prevent misalignment, then substrate alignment improves, but the risk of substrate adherence and liquid crystal spreading defects increases
Solution Approach 1:
The protruding portion is specifically located in the non-display area rather than uniformly distributed, providing localized support where liquid crystal spreading is most critical, thus maintaining alignment precision while protecting liquid crystal filling reliability in the display area
Solution Approach 2:
The protruding portion is prepared in advance on the organic layer to create a controlled support structure that allows substrate alignment through the black column spacer while preventing excessive pressure that would harm liquid crystal spreading, resolving the contradiction between alignment precision and filling reliability
Data Source
AI summary
A liquid-crystal display device includes: a first substrate; a second substrate disposed opposite to the first substrate, where a display area and a non-display area are defined in each of the first and second substrates, a liquid-crystal layer disposed between the first substrate and the second substrate, an organic layer including a protruding portion disposed in the non-display area of the first substrate, and a light-blocking pattern disposed on the organic layer and comprising a step protruding therefrom, where the step overlaps the protruding portion.