Color Filter Trench Gate Line for LCD Wiring Resistance
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Solution Overview
Problem
The display quality of liquid crystal display (LCD) devices is compromised by misalignment between the TFT substrate and the color filter substrate, leading to increased resistance-capacitance delay in wiring, which affects the charging ability and driving margin of TFTs, especially as LCDs become larger and higher resolution.
Innovation Solution
A display substrate design featuring metal wiring formed in trenches defined by color filters, with an insulation layer and pixel electrodes, which reduces resistance and enhances the aperture ratio by eliminating additional light-blocking layers and ensuring the thickness of metal wiring matches that of the color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal wiring is formed in trenches defined by color filters, then resistance of wiring is decreased and aperture ratio is enhanced, but manufacturing complexity increases
Solution Approach 1:
The gate line is formed in a trench structure (vertical dimension) rather than on the surface, allowing it to extend along the first direction while passing through the color filter layer. This dimensional change enables the wiring to achieve lower resistance by reducing the path length and improving electrical contact, while the trench structure integrates with the color filter geometry to maintain aperture ratio.
Solution Approach 2:
The insulation layer is formed to cover both the color filters and the gate line, merging the insulation function with the existing structural elements. This integration reduces the need for separate insulation components and simplifies the overall manufacturing process while maintaining the low resistance wiring characteristic.
2Area of stationary object
If additional light-blocking layers are eliminated, then aperture ratio is enhanced, but structural stability may be compromised
Solution Approach 1:
The insulation layer serves multiple functions: it provides electrical insulation between different components, acts as a protective layer for the underlying structures, and maintains structural integrity without requiring additional light-blocking layers. This multi-functionality allows the aperture ratio to be enhanced while preserving structural stability.
Solution Approach 2:
The thickness of the metal wiring is matched to that of the color filters, creating a balanced structural configuration. This parameter matching ensures that the removal of additional light-blocking layers does not compromise structural stability, as the metal wiring and color filter thickness are optimized to work together in maintaining mechanical integrity.
Data Source
AI summary
A display substrate includes a plurality of color filters formed on a base substrate, a gate line formed in a trench defined by at least one of the color filters and extended along a first direction, an insulation layer formed on the color filters and the gate line, a data line formed on the insulation layer to be extended along a second direction crossing the first direction, and pixel electrodes formed on the base substrate having the data line formed thereon.