Display Panel Shielding Layout for External Voltage Noise
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Solution Overview
Problem
Display devices, such as liquid crystal display devices, are susceptible to operational interference from external high voltage noise, which can cause issues like image flickering, affecting the display quality and stability of the touch detection function.
Innovation Solution
A display device structure incorporating a conductive layer maintained at a predetermined potential, specifically overlapping the signal driver, which is connected to a wiring substrate extending from a cover member, helps to suppress the adverse effects of external voltage noise by grounding the signal driver and surrounding components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the driver is provided on the display panel, then the device complexity is reduced, but the reliability deteriorates due to susceptibility to external high voltage noise
Solution Approach 1:
A conductive layer is introduced as an intermediary between the external environment and the driver circuit on the display panel. This conductive layer acts as a shield that intercepts external high voltage noise before it can reach the driver, thereby protecting the integrated driver while maintaining the benefit of on-panel integration.
Solution Approach 2:
The conductive layer is positioned in advance to counteract external high voltage noise before it can adversely affect the driver operation. By establishing this protective barrier beforehand, the system prevents noise-induced operational issues rather than attempting to correct them after they occur.
2Reliability
If external high voltage is applied, then the operational stability deteriorates, but adding shielding structures increases the device complexity
Solution Approach 1:
The conductive layer serves multiple functions simultaneously: it provides electromagnetic shielding against external high voltage noise, maintains electrical potential distribution, and can be integrated with existing display panel structures. This multi-functionality achieves operational stability without proportionally increasing device complexity.
Solution Approach 2:
The conductive layer is maintained at a predetermined potential (such as ground potential) to optimize its shielding effectiveness. By controlling the electrical parameter of the conductive layer, the system achieves noise protection while keeping the structural additions minimal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces the impact of external voltage noise on the display device's operation, enhancing display quality and stabilizing the touch detection function by maintaining the signal driver and surrounding components at a stable potential.
Implementation Method 1
a conductive layer maintained at a predetermined potential... overlaps the extension portion in plan view... effectively reduces the impact of external voltage noise on the signal driver
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate opposing the first substrate, a wiring substrate connected to the first substrate, a cover member located on an opposite side to the first substrate so as to interpose the second substrate therebetween and a conductive layer maintained at a predetermined potential, and the first substrate includes an extension portion extending further from the second substrate, the wiring substrate is connected to the extension portion, the cover member includes a first surface opposing the extension portion, and the conductive layer overlaps the extension portion in plan view.