LCD Array Substrate Gate Metal Color Filter
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Solution Overview
Problem
The existing manufacturing processes for liquid crystal display (LCD) devices face challenges such as misalignment during substrate assembly, leading to light leakage and parasitic capacitance issues, which affect display quality and manufacturing yield.
Innovation Solution
The implementation of a thin film transistor array substrate with a color filter on the gate metal layer, protected by a first and second gate insulating layer, and a thick data metal layer to reduce signal delay and parasitic capacitance, while forming the black matrix on the substrate to minimize misalignment effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If color filter layer is formed on the first substrate to reduce misalignment, then alignment precision is improved, but parasitic capacitance increases causing cross talk
Solution Approach 1:
An insulating layer is introduced as an intermediary between the color filter layer and the data line to reduce parasitic capacitance. The insulating layer acts as a mediator that maintains the beneficial alignment precision while eliminating the harmful electromagnetic coupling between adjacent conductive elements.
2Reliability
If black matrix is formed with enough alignment margin to prevent light leakage, then display quality is improved, but device complexity increases
Solution Approach 1:
The black matrix and color filter layer are merged into a single integrated structure formed in the same manufacturing process. This combination eliminates the need for separate alignment margins between distinct layers, simplifying the overall device structure while maintaining light leakage prevention functionality.
Solution Approach 2:
The black matrix structure serves multiple functions simultaneously: it prevents light leakage in non-pixel regions, provides structural support, and defines the boundaries between color filters. This multi-functionality reduces the need for additional alignment margins and simplifies the overall design.
3Ease of manufacture
If separate forming processes are used for first and second substrates, then manufacturing flexibility is improved, but misalignment occurs during assembly
Solution Approach 1:
Alignment marks and reference structures are formed in advance during the separate substrate fabrication processes. These preliminary features enable precise alignment during assembly by providing fixed reference points that guide the relative positioning of the first and second substrates, thereby maintaining manufacturing flexibility while achieving high alignment precision.
Data Source
AI summary
An array substrate of a liquid crystal display device having a color filter on a gate metal layer, and a data metal layer formed on the color filter. First a gate insulating layer is formed on the gate metal layer to protect and a second gate insulating layer is formed on the color filter layer. Gate lines and gate electrodes are formed in direct contact with the substrate, and color filters are formed on the gate electrodes. To protect gate lines in the patterning process of color filters, a first gate insulating layer is formed on the gate lines and electrodes. Therefore, a high aperture ratio may be enhanced, and the manufacturing yield may be increased.