OLED Display Substrate with Optical Touch Sensing for Glove Interaction
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Solution Overview
Problem
Existing OLED touch products are limited in usability as they require conductive objects to sense touch, making it difficult for users to interact with them when wearing insulating materials like gloves, as they rely on capacitance changes which are not detected with insulators.
Innovation Solution
An OLED display substrate with integrated optical sensing units, including photosensitive sensors and solar cells, that generate electric signals based on light intensity changes, allowing for both conductor and insulator touch recognition by determining touch point positions through intersecting electrode lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive touch sensing is used in OLED displays, then the touch detection mechanism is simple and integrated, but the display cannot detect touches with insulating objects like gloves
Solution Approach 1:
The patent combines capacitive touch sensing and optical sensing into a single OLED display structure. The display substrate includes both touch electrode lines for capacitive sensing and optical sensing units with photosensitive sensors for optical detection, enabling dual-mode touch detection that works with both conductive and insulating objects
Solution Approach 2:
The OLED display is designed to perform multiple functions: it serves as both the display medium and the touch sensing medium. The optical sensing units enable the display to detect both capacitive touches (conductive objects) and optical touches (insulating objects), making the touch interface universal for different types of interactors
2Adaptability or versatility
If a separate touch panel is hung externally on the OLED display, then touch sensing can be added, but the overall device thickness and structural complexity increase
Solution Approach 1:
The patent integrates the touch sensing function directly into the OLED display substrate by incorporating optical sensing units among the light-emitting units. This eliminates the need for a separate external touch panel, reducing structural complexity and device thickness while maintaining touch sensing functionality
Solution Approach 2:
The OLED display substrate is designed to simultaneously serve as the display structure and the touch sensing structure. The optical sensing units are embedded within the display substrate, allowing the same structure to perform both display and touch detection functions
3Adaptability or versatility
If optical sensing units are integrated into the OLED display substrate, then both conductor and insulator touch recognition is enabled, but the manufacturing process becomes more complex
Solution Approach 1:
The display substrate is divided into light-emitting units and optical sensing units that are alternately arranged. Each unit type has its own simplified structure, and the segmentation allows for specialized manufacturing processes for each unit type while maintaining overall integration
Solution Approach 2:
The patent uses the same basic layer structure (electrode, organic functional layer, counter electrode) for both light-emitting units and optical sensing units, but changes the optical parameters (emissive vs. photosensitive) to create different functional units. This parameter-based differentiation simplifies manufacturing by using similar fabrication processes
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
Enables users to interact with OLED displays using either conductive or insulative objects, enhancing usability and operation experience, while also providing real-time power generation from ambient light to reduce energy consumption.
Implementation Method 1
the photosensitive sensor is configured to generate an electric signal according to a light intensity change of a sensed touch point
Implementation Method 2
a plurality of optical sensing units located in the second sub-regions, and first drive electrode lines and first transmission electrode lines connected with the optical sensing units and intersecting with each other; wherein, the optical sensing units each comprise a photosensitive sensor, and the photosensitive sensor is configured to generate an electric signal according to a light intensity change of a sensed touch point
Data Source
AI summary
An OLED display substrate, a touch display panel and a display device are provided. The OLED display substrate has a base substrate and a display region, the display region includes: a plurality of first sub-regions arranged at intervals and second sub-regions located between the first sub-regions; at least one OLED light-emitting unit located in the first sub-regions; a plurality of optical sensing units located in the second sub-regions, and first drive electrode lines and first transmission electrode lines connected with the optical sensing units and intersecting with each other; wherein, the optical sensing unit includes a photosensitive sensor, and the photosensitive sensor is configured to generate an electric signal according to a light intensity change of a sensed touch point; and the first drive electrode line and the first transmission electrode line are configured to provide the electric signal to determine a position of the touch point.