Array Substrate Color Filter Protrusion for LCD Alignment
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Solution Overview
Problem
As liquid crystal display devices increase in resolution, the reduced area of contact holes can lead to unreliable electrical connections between pixel electrodes and switching elements, and misalignment of the liquid crystal layer, compromising display quality.
Innovation Solution
The implementation of an array substrate with a color filter layer featuring recesses and protrusions on adjacent color filters, along with a shielding electrode that covers data lines, helps maintain reliable connections and prevents misalignment of the liquid crystal layer by ensuring proper alignment and coverage of the data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the contact hole area is reduced to increase resolution, then the resolution is improved, but the electrical connection reliability between pixel electrode and switching element deteriorates
Solution Approach 1:
The invention transitions from a two-dimensional planar contact hole to a three-dimensional structure by forming a protrusion extending from the color filter layer into the contact hole region. This vertical dimension allows the contact hole to maintain a larger effective area for electrical connection while the pixel area remains reduced, thus resolving the contradiction between resolution and connection reliability.
2Measurement precision
If the pixel area is reduced to increase resolution, then the resolution is improved, but the alignment of liquid crystal layer with peripheral wiring deteriorates
Solution Approach 1:
The protrusion is formed in advance during the color filter layer formation process, before liquid crystal layer alignment. This pre-formed protrusion serves as a physical guide structure that defines the contact hole position and dimensions, ensuring that the liquid crystal layer can be accurately aligned with the peripheral wiring during subsequent manufacturing steps, thus preventing misalignment issues.
3Area of stationary object
If the contact hole area is reduced, then the pixel area utilization is improved, but the electrical connection stability deteriorates
Solution Approach 1:
The protrusion structure creates a nested configuration where the contact hole is effectively enlarged by the protrusion extending into the contact hole region. This nested structure allows the contact hole to accommodate a larger effective area for electrical connection while maintaining compact pixel dimensions, thus improving connection stability without sacrificing pixel area utilization.
Data Source
AI summary
An array substrate is provided. The array substrate includes: a first substrate; and a color filter layer disposed on the first substrate, wherein the color filter layer comprises: a first color filter that is located on the first substrate and comprises a recess and a sub-protrusion; and a second color filter that is located on the first substrate to be adjacent to the first color filter along a first direction, and comprises a protrusion protruding toward the recess of the first color filter. The sub-protrusion of the first color filter protrudes toward the protrusion of the second color filter and is at least partially superimposed with the protrusion.