Flexible Display Grounding Structure for PI Charge Dissipation
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Solution Overview
Problem
Flexible display devices using polyimide substrates experience luminance unevenness due to charge accumulation, which affects the performance of the display panel.
Innovation Solution
A conductive layer is formed in the second buffer layer under the polyimide substrate, and connected to the low-potential power supply line through a contact hole, effectively grounding and removing accumulated charges, thereby minimizing luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a polyimide substrate is used in flexible display devices, then flexibility and light weight are achieved, but charge accumulation occurs causing luminance unevenness
Solution Approach 1:
A conductive layer is introduced as an intermediary component between the polyimide substrate and the display structure. This conductive layer acts as a charge dissipation pathway, mediating the charge accumulation problem while preserving the flexibility and light weight benefits of the polyimide substrate.
Solution Approach 2:
The electrical conductivity parameter of the substrate structure is changed by adding the conductive layer. This parameter change enables charge dissipation from the polyimide substrate, resolving the luminance unevenness caused by charge accumulation while maintaining the substrate's flexibility and light weight properties.
2Adaptability or versatility
If a polyimide substrate is used in flexible display devices, then flexibility is achieved, but charge accumulation causes luminance defects in edge areas
Solution Approach 1:
The conductive layer serves as an intermediary that resolves the charge accumulation issue in the polyimide substrate. It provides a charge dissipation pathway that eliminates luminance defects in edge areas while preserving the substrate's flexibility and adaptability for various display configurations.
Solution Approach 2:
By changing the electrical conductivity parameter through the addition of the conductive layer, the substrate structure gains charge dissipation capability. This parameter modification eliminates luminance uniformity issues while maintaining the flexibility that enables versatile display applications.
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 solution significantly reduces luminance defects in the edge areas of the display panel by addressing charge accumulation issues, enhancing the overall display performance.
Implementation Method 1
A conductive layer is formed in the second buffer layer under the polyimide substrate, and connected to the low-potential power supply line through a contact hole, effectively grounding and removing accumulated charges
Data Source
AI summary
A flexible display device according to an exemplary embodiment of the present disclosure may include a substrate divided into a display area and a non-display area; a first buffer layer disposed on the substrate; a second buffer layer disposed under the substrate; a support member disposed under the second buffer layer; a transistor and a light emitting element disposed above the first buffer layer in the display area; a conductive layer disposed in the second buffer layer in the non-display area; and a connection member disposed on the first buffer layer in the non-display area and electrically connected to the conductive layer through a contact hole, so that an effect of minimizing luminance unevenness of a display panel due to the use of a polyimide (PI) substrate by grounding and removing charges accumulated in the PI substrate, can be provided.