Slit Shielding Pattern Layout for Display Charging Interference
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Solution Overview
Problem
Magnetic fields generated by shielding electrodes can decrease the charging efficiency of charging electrodes and cause interference with pixel driving in display devices.
Innovation Solution
A display device with a shielding pattern having a specific thickness and slits is designed to overlap the charging electrode, ensuring that the shielding pattern's thickness satisfies the relation T1≤(DABC)1/2, where T1 represents the thickness, A is pi, B is permeability, C is frequency, and D is resistivity, and the shielding pattern is divided into sections by slits to form a current path that minimizes magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding electrode is used to block magnetic fields, then magnetic interference is reduced, but charging efficiency decreases due to magnetic field attenuation
Solution Approach 1:
The shielding pattern is divided into multiple sections by slits, transforming a continuous shielding structure into segmented sections. This segmentation allows the shielding pattern to block magnetic fields while reducing the formation of large eddy currents that would otherwise attenuate the charging magnetic field, thereby maintaining charging efficiency while providing magnetic shielding.
Solution Approach 2:
The shielding pattern is positioned specifically in the non-display region of the display panel, providing magnetic shielding where needed without interfering with the charging electrode's operation in the display region. This localized shielding approach ensures magnetic interference is reduced in critical areas while charging efficiency is maintained.
2Speed
If a charging electrode is driven at high frequency, then charging speed increases, but interference with pixel driving occurs
Solution Approach 1:
The shielding pattern with slits is positioned between the charging electrode and the pixel circuitry, segmenting the electromagnetic field distribution. This segmentation allows high-frequency charging signals to be transmitted efficiently while reducing parasitic coupling and interference with the pixel driving circuits, enabling fast charging without compromising display performance.
Solution Approach 2:
The shielding pattern acts as an intermediary structure between the charging electrode and the pixel circuitry. It provides electromagnetic isolation that allows the charging electrode to operate at high frequencies for fast charging while preventing harmful interference from reaching the sensitive pixel driving circuits.
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
The solution effectively prevents the decrease in charging efficiency and interference with pixel driving, maintaining optimal performance of both charging and display functions.
Implementation Method 1
a first shielding pattern disposed on the base layer and overlapping the display region, the first shielding pattern having a first thickness and having at least one slit dividing the first shielding pattern into a plurality of sections
Implementation Method 2
an input sensor disposed on the display panel, the input sensor including a sensing electrode configured to sense an electromagnetically induced current
Implementation Method 3
an input sensor disposed on the display panel, the input sensor including a sensing electrode configured to sense an electromagnetically induced current
Data Source
AI summary
The present application relates to a display device and an electronic device including the same. The display device includes a display panel including a display region and a non-display region, and an input sensor disposed on the display panel. The display panel includes a base layer including resin layers, pixels disposed on the base layer and overlapping the display region, a charging electrode disposed under at least one resin layer and overlapping the display region, and a first shielding pattern disposed on the base layer and overlapping the display region, the first shielding pattern having a first thickness and having at least one slit dividing the first shielding pattern into sections. The first thickness corresponds to a thickness satisfying a relation of the following equation:T1≤(DABC)1/2,where T1 represents the first thickness, A is π, B is permeability of the first shielding pattern, C is frequency of electric current flowing through the first shielding pattern, and D is resistivity of the first shielding pattern.