OLED Touch Panel Shield Conductor Noise Blocking
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Solution Overview
Problem
In organic electroluminescence devices with touch panel functionality, electric field noise generated during light emission affects the accuracy of contact position detection, particularly when using individual negative electrodes for R, G, and B primary color components, leading to decreased detection precision.
Innovation Solution
An organic electroluminescence device configuration with a shield conductor on the sealing substrate, which blocks electric field noise by being formed on the element-substrate side and having a fixed potential, reducing noise interference on the touch panel section and maintaining optical output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual negative electrodes are formed for R, G, and B primary color components, then voltage control for each color is improved, but electric field noise reaches the detection electrode through gap regions, decreasing contact position detection accuracy
Solution Approach 1:
A shield electrode is introduced as an intermediary component between the individual negative electrodes and the detection electrode. This shield electrode blocks the electric field noise generated by the negative electrodes from reaching the detection electrode, thereby preventing detection errors while maintaining the individual negative electrode configuration for voltage control
Solution Approach 2:
The harmful electric field noise is extracted and isolated from the detection system by introducing the shield electrode. The shield electrode specifically targets and blocks only the noise component without interfering with the optical output or the voltage control function of the individual negative electrodes
2Measurement precision
If a shield conductor is added to block electric field noise, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The shield electrode is designed to serve multiple functions: it blocks electric field noise from reaching the detection electrode, maintains optical transparency to preserve display quality, and can be integrated with the existing sealing substrate structure. This multi-functionality reduces the overall device complexity despite adding the shielding function
3Object-affected harmful factors
If shield conductor is formed on sealing substrate, then electric field noise is blocked, but optical output efficiency may be reduced
Solution Approach 1:
The shield electrode is designed with spatially varying properties: it is positioned and dimensioned to provide effective noise blocking only in the regions where electric field interference occurs, while maintaining optical transparency in areas where light transmission is critical. This localized approach optimizes both noise blocking and optical efficiency
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 enhances the accuracy of contact position detection in touch panel user inputs by effectively shielding electric field noise, thereby improving detection precision and reliability while maintaining optical efficiency.
Implementation Method 1
the sealing substrate has a shield conductor that is formed on the element-substrate side of the sealing substrate, the shield conductor having a fixed potential
Implementation Method 2
An organic electroluminescence device (i.e., apparatus) uses organic electroluminescence elements as its picture elements
Implementation Method 3
The capacitive sensing scheme is defined as a method for detecting the contact position of, for example, a finger or the like by means of electrostatic capacitance
Data Source
AI summary
The invention provides an organic electroluminescence device having an input function, including: an element substrate that has a light-emitting layer sandwiched between a positive electrode and negative electrode in each of a plurality of sub pixel regions that are arrayed in a matrix pattern; a sealing substrate that seals the element substrate; and a touch panel section that is provided at the outer-surface side of the sealing substrate. In such a configuration of the organic electroluminescence device having an input function according to an aspect of the invention, the negative electrode is formed on an individual basis so as to correspond to the display color of each of the sub pixel regions; and the sealing substrate has a shield conductor that is formed on the element-substrate side of the sealing substrate, the shield conductor having a fixed potential.