OLED Display Electrode Segmentation for Sensor Integration
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Solution Overview
Problem
Display devices with organic light emitting diodes (OLEDs) face challenges in integrating sensors without hindering their functionality, as existing structures may interfere with sensing operations due to the overlap of sensors with the display area.
Innovation Solution
The implementation of a display device configuration that includes a substrate, pixel circuits, insulating layers, first and second electrodes, an organic layer, and a sensor area with relay wires and connection portions, allowing the second electrodes to be separated via the sensor area and connected through relay wires, ensuring uninterrupted sensor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors are arranged to overlap with the display area, then sensing functionality is integrated into the display device, but sensing operation is hindered by the display structure
Solution Approach 1:
The display area is divided into a display region and a sensor area, with the sensor area specifically designed to allow sensor placement. This segmentation enables both display and sensing functions to coexist without interference, as the sensor area structure is optimized for sensing operations while the display region maintains normal display functionality.
Solution Approach 2:
The sensor area is configured with different structural characteristics compared to the general display area. Specifically, the second electrode in the sensor area has a different pattern (linear shape extending in one direction) compared to the grid pattern in the display region, creating local structural quality that permits sensor operation while maintaining overall display functionality.
2Reliability
If a different structure is applied in the sensor area, then sensing is not hindered, but device structure becomes more complex
Solution Approach 1:
The display element structure serves multiple functions: in the display region it provides display functionality with a grid pattern of second electrodes, while in the sensor area the same basic structure type (with modified linear pattern) enables both display and sensing functions. This multi-functionality reduces the need for completely separate structures for sensing.
Solution Approach 2:
The second electrode in the sensor area changes from a two-dimensional grid pattern to a one-dimensional linear pattern extending in a specific direction. This dimensional simplification in the sensor area reduces structural complexity while still maintaining the necessary electrical connections and enabling sensing operation.
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 configuration enhances the functionality of the sensor area and its vicinity by maintaining image display quality and preventing display failure near the sensor area, while allowing for effective sensing without structural interference.
Implementation Method 1
display devices having organic light emitting diodes (OLED) applied thereto as display elements
Data Source
AI summary
According to one embodiment, a display device comprises a substrate, pixel circuits, an insulating layer, first electrodes, an organic layer, linear second electrodes, a sensor area, a relay wire, and a first connection portion and a second connection portion. At least one of the second electrodes includes a first line portion and a second line portion separated via the sensor area in plan view. The relay wire is connected to the first line portion by the first connection portion and connected to the second line portion by the second connection portion.