Embedded Organic Light Sensor Layout Without Display Holes
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Solution Overview
Problem
Display devices with embedded light sensors face issues such as reduced display area size, image discontinuity, exposure to external elements, and high cost due to inorganic light sensors with large volume and weight.
Innovation Solution
A display device design incorporating a substrate with unit pixel and light sensor areas, shared electrodes, and organic light emitting elements, allowing for integrated light sensors without reducing the display area and minimizing exposure to external elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hole is formed to mount the light sensor, then the light sensor can be embedded in the display device, but the display area size is reduced and image discontinuity occurs
Solution Approach 1:
The patent merges the light sensor mounting function with the display pixel structure by forming the light sensor on the same substrate without requiring a separate hole. The light sensor and display pixels share the same structural platform, eliminating the need for dedicated mounting holes and preserving full display area.
Solution Approach 2:
The substrate serves multiple functions: it acts as both the display pixel electrode substrate and the light sensor mounting substrate. This multi-functional design eliminates the need for separate hole structures and allows the light sensor to be integrated without reducing display area.
2Reliability
If a hole is formed to mount the light sensor, then the light sensor can be embedded in the display device, but image discontinuity is recognized by users
Solution Approach 1:
The light sensor is merged with the display pixel structure on the same substrate, eliminating the hole that would disrupt image continuity. The integrated structure ensures the display surface remains uniform and continuous.
3Reliability
If an inorganic light sensor is used, then the light sensor can be embedded in the display device, but cost increases and weight increases
Solution Approach 1:
The patent employs an organic light sensor instead of an expensive inorganic light sensor. Organic light sensors are cheaper and lighter, making them suitable for mass production in display devices while maintaining adequate performance.
Solution Approach 2:
The patent changes the material parameter of the light sensor from inorganic to organic. This material substitution reduces both cost and weight while maintaining the essential light-sensing function required for the display device.
4Reliability
If an inorganic light sensor is used, then the light sensor can be embedded in the display device, but the sensor occupies large space and has large volume
Solution Approach 1:
The organic light sensor provides a compact alternative to inorganic sensors, reducing the volume occupied by the light sensing component while maintaining functional performance.
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 solution maintains display area integrity, prevents sensor-related image discontinuity, enhances reliability, reduces costs, and uses organic sensors to minimize space and weight.
Implementation Method 1
a light active layer disposed in the unit light sensor area between the second electrode and the third electrode
Data Source
AI summary
A display device is provided, which includes a light sensor in a display panel. The display device comprises a substrate having a unit pixel area and a unit light sensor area, a first electrode over the substrate, a second electrode over the first electrode, a third electrode over the second electrode, a light emitting layer in the unit pixel area and disposed between the first electrode and the second electrode, and a light active layer disposed in the unit light sensor area and disposed between the second electrode and the third electrode.