Display Panel Partition Wall Leakage Current Reduction
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Solution Overview
Problem
Existing display devices require separate components for biometric sensing, which reduces portability and convenience, and suffer from leakage currents that affect sensing performance when integrating photosensors with display panels.
Innovation Solution
A display device with a photosensor embedded in the display panel, featuring a matrix arrangement of light-emitting subpixels and a sensor pixel, where a partition wall reduces leakage current by separating the light-emitting and light-sensing areas, and a dummy organic material is used to maintain the cathode connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a photosensor is integrated into the display panel, then portability and convenience are improved, but leakage current between the photosensor and adjacent pixels increases
Solution Approach 1:
The patent divides the display panel into distinct functional regions by introducing partition walls that physically separate the photosensor from adjacent light-emitting pixels. This segmentation prevents electrical interference and leakage current between neighboring components while maintaining their integrated structure within the same panel.
Solution Approach 2:
The patent introduces a partition wall as an intermediary structure between the photosensor and adjacent pixels. This partition wall acts as a barrier that blocks leakage current paths while allowing the photosensor to remain integrated with the display panel, thus resolving the harmful electrical interference without sacrificing the benefits of integration.
2Object-generated harmful factors
If a partition wall is introduced to separate photosensor and pixels, then leakage current is reduced, but device complexity increases
Solution Approach 1:
The patent implements the partition wall as a thin film or layer within the display panel structure. This approach provides effective electrical separation to reduce leakage current while minimizing the increase in device complexity and maintaining a relatively simple overall panel architecture.
3Measurement precision
If the photosensor area is increased to improve sensing performance, then biometric detection accuracy is improved, but the area available for light-emitting pixels is reduced
Solution Approach 1:
The patent optimizes the photosensor area by utilizing the third dimension (depth/thickness) of the display panel structure. The photosensor can extend vertically or use multiple layers within the panel thickness, allowing increased sensing capability without proportionally reducing the horizontal area available for light-emitting pixels.
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
Improves portability and convenience by integrating sensing capabilities within the display panel and enhances sensing performance by minimizing leakage currents, thereby accurately detecting biometric information such as fingerprint, iris, blood pressure, and blood flow.
Implementation Method 1
The sensor pixel may include a photoelectric conversion layer disposed in the light sensing area
Data Source
AI summary
According to an embodiment, a display device may include a display panel which may include a display area and a non-display area. The display panel may include a first subpixel including a first light emitting area, a second subpixel including a second light emitting area, a third subpixel including a third light emitting area, a sensor pixel including a light sensing area, a pixel defining layer separating the first through third light emitting areas and the light sensing area, and a partition wall disposed on the pixel defining layer to surround the sensor pixel.