Flexible Display Panel Shielding for Parasitic Capacitance Noise
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Solution Overview
Problem
Thin and flexible display panels are prone to noise-induced display defects due to parasitic capacitance changes between the display panel and its housing or human body, leading to local luminance changes and potential display issues.
Innovation Solution
A display panel design that includes a flexible substrate, a transistor, a light-emitting element, and conductive layers, where the light-emitting element has a first electrode connected to the transistor and a second electrode supplied with a constant potential, and the conductive layers are insulated from the transistor and light-emitting element but overlap with them through the flexible substrate, with one conductive layer supplied with a constant potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the display panel is made thin and flexible, then the display device achieves lightweight and flexible properties, but the display panel becomes more susceptible to noise from parasitic capacitance changes
Solution Approach 1:
A conductive layer is introduced as an intermediary component between the flexible substrate and the external environment. This conductive layer is electrically connected to a constant potential source, acting as a shield that mediates the interaction between the display panel and external electrical noise, thereby protecting the display quality while maintaining the thin and flexible structure
Solution Approach 2:
The conductive layer is supplied with a constant potential to create an equipotential region around the display panel. This equipotential shielding effect stabilizes the electrical environment, preventing parasitic capacitance changes from affecting display quality, thus resolving the contradiction between thin flexible design and display stability
2Length of stationary object
If the display panel is made thin, then the display device achieves a thin profile, but the display panel is more likely to be influenced by external noise
Solution Approach 1:
The conductive layer serves as an intermediary shielding structure that does not significantly increase the overall thickness but effectively blocks noise interference. By positioning this conductive layer within the existing thin panel structure and connecting it to constant potential, the panel maintains its thin profile while gaining noise resistance
Solution Approach 2:
The conductive layer pre-establishes an electrical shield before external noise can affect the display panel. By supplying constant potential to this layer in advance, the system creates a protective electrical field that actively counteracts incoming noise, preventing rather than merely responding to interference
3Adaptability or versatility
If the display panel is made flexible, then the display device achieves flexibility, but parasitic capacitance changes occur when the display panel changes shape
Solution Approach 1:
The conductive layer maintained at constant potential creates an equipotential environment that remains stable regardless of panel deformation. This equipotential shielding effect decouples the electrical characteristics from mechanical shape changes, allowing the flexible panel to change shape without causing parasitic capacitance variations that would affect luminance
Solution Approach 2:
The conductive layer acts as a mediator that isolates the light-emitting elements from the electrical effects of shape changes. When the flexible panel deforms, the conductive layer absorbs and shields the electrical disturbances, preventing them from reaching the sensitive light-emitting elements and causing luminance instability
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 design reduces display defects by minimizing the impact of noise-induced capacitance changes on the display panel's luminance, thereby improving display quality and reliability, especially in thin and flexible display devices.
Implementation Method 1
The light-emitting element includes a first electrode over the flexible substrate, a layer containing a light-emitting substance (hereinafter referred to as an EL layer) over the first electrode, and a second electrode over the EL layer
Data Source
AI summary
The display defects of a display device are reduced. The display quality of the display device is improved. The display device includes a display panel and a first conductive layer. The display panel includes a display element including a pair of electrodes. An electrode of the pair of electrodes which is closer to one surface of the display panel is supplied with a constant potential. A constant potential is supplied to the first conductive layer. The second conductive layer provided on the other surface of the display panel is in contact with the first conductive layer, whereby the second conductive layer is also supplied with the constant potential. The second conductive layer includes a portion not fixed to the first conductive layer.