LCD Electrode Layout for Misalignment-Resistant Light Blocking
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Solution Overview
Problem
Liquid crystal displays face light leakage issues due to misalignment between upper and lower substrates during the bending process, which existing technologies fail to effectively prevent.
Innovation Solution
A display device design featuring a light blocking layer on the second substrate with specific electrode configurations and spacings, including storage electrode lines and a contact pad for the drain electrode, positioned to prevent light leakage by ensuring edges align closely along a line, thereby maintaining light blocking functionality even with misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking layer is disposed on the second substrate to prevent light leakage, then light blocking functionality is improved, but manufacturing precision requirements increase due to misalignment between substrates
Solution Approach 1:
The patent extends the light blocking function from a single-layer approach to a multi-dimensional solution by incorporating electrode lines and contact pads that extend in specific directions (first and second directions perpendicular to each other). This dimensional extension creates overlapping blocking regions that compensate for misalignment in any direction, effectively addressing the precision issue through spatial redundancy.
Solution Approach 2:
The light blocking function is segmented into multiple independent components: light blocking layers, electrode lines, and contact pads. Each component can be independently positioned and optimized, allowing the system to maintain effective light blocking even when individual components are slightly misaligned due to manufacturing variations.
2Object-affected harmful factors
If electrode lines and contact pads are positioned closely to prevent light leakage, then light blocking effectiveness is improved, but the risk of electrical short circuit increases
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the electrode lines and contact pads. This intermediate layer maintains electrical insulation while allowing the horizontal positioning of these elements to be close together for effective light blocking, thus resolving the contradiction between light blocking effectiveness and electrical reliability.
Solution Approach 2:
The solution moves the insulation function from a vertical separation approach to a multi-dimensional configuration where insulating layers are strategically positioned between electrode lines and contact pads. This dimensional arrangement allows close horizontal spacing for light blocking while maintaining vertical and lateral electrical isolation.
3Object-affected harmful factors
If the light blocking layer completely covers the first electrode, then light leakage is prevented, but the opening for electrode connection is reduced
Solution Approach 1:
The patent merges the light blocking function with the electrode connection structure by designing the electrode lines and contact pads to serve dual purposes: they provide electrical connectivity while simultaneously acting as light blocking elements. This integration eliminates the need for separate light blocking structures that would obstruct connections.
Solution Approach 2:
The solution transitions from a planar light blocking approach to a multi-dimensional electrode configuration where electrode lines extend in the first direction and contact pads are positioned in the second direction, creating a three-dimensional arrangement that allows both comprehensive light blocking and accessible electrode connections.
Data Source
AI summary
An exemplary embodiment of the present inventive concept provides a display device including: a first substrate; a gate line; a storage electrode; a data line insulated from the gate line and the storage electrode line and extending along a second direction; a drain electrode disposed on a same layer as the data line to include an contact pad; a first electrode electrically connected to the drain electrode; a second substrate overlapping the first substrate; and a light blocking layer disposed on the second substrate to have an opening exposing the first electrode, wherein an edge of a region of the storage electrode line in the second direction and an edge of the contact pad of the drain electrode in the second direction are disposed on a line extending in the first direction.