OLED Assembly Touch Detection Decoupling
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Solution Overview
Problem
Existing assemblies for operating organic radiation-emitting components, such as OLEDs, face challenges in ensuring reliable operation, cost-effective production, and independent touch detection during emission, often requiring complex synchronization and additional components like control units and conductive foils.
Innovation Solution
The assembly incorporates a driver circuit, a decoupling unit, and a touch sensor, where the touch sensor is decoupled from the driver circuit using a decoupling unit, allowing touch detection without interrupting the radiation-emitting operation, and utilizing transparent conductive oxides for electrodes to enable touch detection without additional components like conductive foils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor is integrated into the radiation-emitting component, then touch detection capability is added, but the operational reliability deteriorates due to interference between touch detection signals and driver circuit signals
Solution Approach 1:
The signal transmission paths are segmented into separate conductors: a first conductor carries driver circuit signals to the radiation-emitting component, while a second conductor carries touch detection signals. This physical segmentation prevents signal interference between the two functions, allowing both touch detection and radiation emission to operate reliably simultaneously.
Solution Approach 2:
The patent introduces intermediary conductors and coupling mechanisms that mediate between the driver circuit and touch sensor. These intermediaries isolate the two signal paths, preventing direct interference while maintaining functional connectivity. The separate conductors act as intermediaries that allow both functions to coexist without mutual disruption.
2Adaptability or versatility
If additional components like control units and conductive foils are added for touch detection, then touch detection functionality is achieved, but the device complexity increases
Solution Approach 1:
The radiation-emitting component's electrode structure serves dual purposes: it functions as both the active element for radiation emission and as part of the touch sensor structure. The transparent conductive oxide layers and electrodes are designed to perform both optical/electrical functions and capacitive touch sensing, eliminating the need for separate dedicated touch sensor components.
Solution Approach 2:
The patent merges the driver circuit signals and touch sensor signals into a unified structure where both functions share common components like the transparent conductive oxide layers and electrode configurations. By combining touch detection functionality with the existing radiation-emitting structure, the patent avoids adding separate conductive foils or independent control units, thereby reducing overall device complexity.
3Measurement precision
If the radiation-emitting component is interrupted for touch detection, then accurate touch sensing is possible, but the continuous operation and brightness stability deteriorate
Solution Approach 1:
The patent enables continuous operation of the radiation-emitting component by maintaining uninterrupted driver circuit signals through the first conductor. Simultaneously, touch detection occurs continuously through the separate second conductor without requiring interruption of the radiation emission. This continuous action in parallel paths maintains both brightness stability and touch sensing accuracy.
Solution Approach 2:
By segmenting the signal paths into separate conductors, the patent allows independent operation of driver signals and touch detection signals. This segmentation enables simultaneous continuous radiation emission and continuous touch sensing without mutual interruption, maintaining both brightness stability and touch detection precision.
4Power
If high current levels are used for radiation emission, then the brightness and performance improve, but the component's life cycle and reliability deteriorate
Solution Approach 1:
The separate second conductor for touch detection acts as an intermediary that enables touch sensing without requiring interruption or modification of the driver circuit's current supply to the radiation-emitting component. This allows the component to operate continuously at optimized current levels for both performance and longevity, without needing high current interruptions for touch detection.
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 enables reliable and cost-effective operation of organic radiation-emitting components with independent touch detection, preventing flickering and extending the component's life cycle by eliminating the need for synchronization and additional components, while maintaining low current levels for efficient operation.
Implementation Method 1
The touch sensor is decoupled from the driver circuit by means of the decoupling unit in such a way that a touch of the sensor electrode by a user is detectable during the radiation-emitting operation of the radiation-emitting component
Implementation Method 2
The respective electrode can comprise a transparent conductive oxide (TCO). Transparent conductive oxides are transparent, conducting materials
Implementation Method 3
Transparent conductive oxides are transparent, conducting materials, usually metal oxides such as e.g. zinc oxide, tin oxide, cadmium oxide, titanium oxide, indium oxide or indium tin oxide (ITO)
Implementation Method 4
In particular, the touch sensor is a capacitive touch sensor. For example, detection of the high-frequency signal for touch detection can be effected by measuring the impedance between the sensor electrode and a voltage supply input of the touch sensor
Implementation Method 5
detection of the high-frequency signal for touch detection can be effected by measuring the impedance between the sensor electrode and a voltage supply input of the touch sensor
Implementation Method 6
the driver circuit is coupled to in each case one of the electrodes of the radiation-emitting component with in each case one of the driver outputs in a DC-wise low impedance manner
Data Source
AI summary
An arrangement for operating an organic radiation-emitting component (D) is specified. The arrangement comprises a driver circuit (T) with at least two driver outputs (TA1, TAn), a decoupling unit (E) with at least two inputs (EE1, EEn) and outputs (EA1, EAn) corresponding to the inputs (EE1, EEn), the radiation-emitting component (D) with at least two electrodes (DE1, DEn), and a contact sensor (S) with a sensor electrode (SE1) which is at least partially formed by one of the electrodes (DE1, DEn) of the radiation-emitting component (D). The radiation-emitting component (D) emits electromagnetic radiation during operation. One of the driver outputs (TA1, TAn) of the driver circuit (T) is coupled in each case, in a low-impedance manner using DC technology, to one of the electrodes (DE1, DEn) of the radiation-emitting component (D). The driver circuit (T) and the contact sensor (S) can be coupled to a common energy source (Q). The contact sensor (S) is decoupled from the driver circuit (T) by means of the decoupling unit (E) in such a manner that contact of the sensor electrode (S) by a user can be detected during operation of the radiation-emitting component (D).