Optical Sensing Pixel Layer Area Ratio for Display Input
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Solution Overview
Problem
Current organic electroluminescent displays face challenges in achieving high-resolution display quality while integrating optical sensing capabilities within the display area.
Innovation Solution
A display device design that includes a first display area with standard red, green, and blue pixels and a second display area with an optical sensing pixel, featuring a transistor, electrodes, and emission layers, where the optical sensing layer covers a larger area than the emission layer to enhance user input detection and image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical sensing capabilities are integrated into the display area, then user input detection is enhanced, but display quality and resolution may be compromised
Solution Approach 1:
The pixel is divided into distinct functional regions: a first emission layer for light emission and an optical sensing layer for sensing. This segmentation allows each layer to be optimized for its specific function while sharing the same pixel structure, enabling both display quality and sensing capability to coexist without compromising either.
2Measurement precision
If the optical sensing layer covers a larger area than the emission layer, then sensing capability is improved, but the emission area is reduced
Solution Approach 1:
The optical sensing layer is designed with non-uniform thickness: a first region with greater thickness than a second region. The thicker first region provides enhanced sensing capability, while the thinner second region minimizes interference with light emission. This local variation in quality allows the sensing layer to perform its function effectively without significantly compromising the emission area.
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 design improves display quality and enables high-resolution imaging while allowing for user input sensing, such as fingerprint detection, by effectively integrating optical sensing capabilities within the display area.
Implementation Method 1
an optical sensing pixel, the optical sensing pixel includes a transistor disposed on a substrate; a first electrode electrically connected to the transistor; a first common layer disposed on the first electrode, an optical sensing layer and a first emission layer disposed on the first common layer; and a second electrode disposed on the first emission layer and on the optical sensing layer
Implementation Method 2
The first emission layer may emit green light
Data Source
AI summary
A display device includes a display panel, wherein a first unit pixel is repeatedly disposed in a first display area, the first unit pixel and a second unit pixel are repeatedly disposed in a second display area, the first unit pixel comprises a red pixel, a green pixel, and a blue pixel, and the second unit pixel comprises a red pixel, a green pixel, a blue pixel, and an optical sensing pixel, the optical sensing pixel includes a transistor disposed on a substrate, a first electrode electrically connected to the transistor, a first common layer disposed on the first electrode, an optical sensing layer and a first emission layer disposed on the first common layer, and a second electrode disposed on the first emission layer and the optical sensing layer, and a planar area of the optical sensing layer is larger than a planar area of the first emission layer.