Display Device Light-Shielding Conductive Layer Over Switch
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Solution Overview
Problem
In liquid crystal display (LCD) devices, light leakage can occur due to misalignment of substrates, leading to decreased transmissivity and aperture ratio, particularly when the light-shielding member is formed on the opposite substrate to the pixel electrodes.
Innovation Solution
A display device design that includes a first base substrate with a gate line, data line, switch, insulating layer, first electrode, and a light-shielding conductive layer directly contacting the first electrode, along with a second electrode insulated from the first electrode and overlapping it, to improve light blocking and reduce misalignment-related light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding member is formed on the opposite substrate to prevent light leakage, then light blocking is improved, but substrate misalignment causes light leakage and decreases transmissivity and aperture ratio
Solution Approach 1:
The patent introduces a new spatial dimension by placing the light-shielding conductive layer on the array substrate (first substrate) rather than the opposite substrate. This dimensional repositioning allows the light-shielding function to be integrated into the array substrate structure, eliminating the alignment dependency between two separate substrates. The light-shielding conductive layer is positioned to overlap with the switch in plan view, creating a three-dimensional arrangement that effectively blocks light leakage paths without requiring precise substrate alignment.
Solution Approach 2:
The patent merges the light-shielding function with the array substrate structure by forming the light-shielding conductive layer directly on the array substrate. This consolidation integrates multiple functions (electrical connection, light shielding, and structural support) into a single substrate system, eliminating the need for separate light-shielding members on the opposite substrate and thereby resolving the alignment precision issue.
2Object-affected harmful factors
If the light-shielding conductive layer directly contacts the first electrode, then light blocking is improved, but electrical insulation may be compromised
Solution Approach 1:
The patent introduces an intermediary insulating layer between the light-shielding conductive layer and the first electrode. This insulating layer acts as a mediator that maintains electrical insulation while allowing the light-shielding conductive layer to be positioned in close proximity to the first electrode for effective light blocking. The insulating layer enables both light shielding and electrical insulation functions to coexist without conflict.
3Manufacturing precision
If the aperture ratio is increased to improve transmissivity, then light transmission is improved, but light leakage may increase
Solution Approach 1:
The patent applies local quality by positioning the light-shielding conductive layer specifically in regions where light leakage occurs (overlapping the switch in plan view) while maintaining large aperture ratios in the display regions. This localized light shielding approach allows the aperture ratio to be maximized in functional areas while preventing light leakage in specific problem areas, achieving both high transmissivity and effective light blocking.
Data Source
AI summary
A display device is provided. The display device includes a first base substrate, a gate line on the first base substrate and extending in a first direction, a data line disposed on the first base substrate, insulated from the gate line, and extending in a second direction, which crosses the first direction, a switch on the first base substrate and electrically connected to the gate line and the data line, an insulating layer on the switch, a first electrode on the insulating layer, a light-shielding conductive layer directly contacting the first electrode and overlapping the switch, and a second electrode insulated from the first electrode and the light-shielding conductive layer, at least partially overlapping the first electrode, and electrically connected to the switch.