Organic Planarization Layer Infrared Absorbing Agent Display
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Solution Overview
Problem
Existing electronic devices face challenges in effectively integrating light emitting and light receiving devices with fingerprint recognition capabilities, particularly in managing external light, especially in the infrared and near-infrared wavelength regions, which can degrade sensing noise and sensitivity.
Innovation Solution
The electronic device incorporates a display module with a light emitting device and a light receiving device separated by a pixel defining layer, along with an organic planarization layer containing an infrared absorbing agent. This configuration blocks external incident light in the infrared and near-infrared wavelength regions, improving sensing noise reduction and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light receiving device is integrated into the display module, then fingerprint recognition capability is improved, but external infrared light can cause sensing noise and reduce sensitivity
Solution Approach 1:
The patent converts the harmful effect of external infrared light into a beneficial feature by using the same infrared absorbing property to block unwanted light while allowing the light receiving device to function. The infrared absorbing layer is positioned to selectively attenuate external infrared light that would cause noise, while the light receiving device captures useful light for fingerprint recognition, thus converting the potential harm of infrared light into a protective mechanism.
Solution Approach 2:
The patent introduces an infrared absorbing layer as an intermediary component between the external environment and the light receiving device. This intermediary layer selectively absorbs harmful infrared light before it reaches the light receiving device, while allowing the device to still detect useful light signals for fingerprint recognition. The intermediary layer acts as a filter that protects the sensing function from external interference.
2Object-affected harmful factors
If additional light shielding components are added to block external infrared light, then sensing noise is reduced, but device complexity increases
Solution Approach 1:
The patent merges the light shielding function with existing structural components of the display module. Instead of adding a separate, standalone light shielding component, the infrared absorbing layer is integrated into the existing pixel defining layer or color filter layer structure. This merging approach allows the light shielding function to be achieved without increasing device complexity, as the same structural elements serve dual purposes: defining pixel boundaries and blocking external infrared light.
Solution Approach 2:
The patent applies multi-functionality to existing layers in the display module structure. The pixel defining layer or color filter layer is designed to serve multiple functions: it defines the pixel boundaries for display, provides color filtering, and simultaneously acts as an infrared absorbing layer to block external infrared light. This universal approach eliminates the need for dedicated light shielding components, reducing overall device complexity while maintaining noise reduction capability.
3Object-affected harmful factors
If the organic planarization layer includes an infrared absorbing agent, then external infrared light is blocked, but the layer may affect light transmission to the light receiving device
Solution Approach 1:
The patent applies local quality by making the infrared absorbing property spatially selective. The infrared absorbing layer is positioned specifically in regions where external infrared light would cause noise, while maintaining light transmission in the active areas where the light receiving device needs to detect light signals. The absorption characteristics are localized to protect the light receiving device from external interference while preserving its light detection capability.
Solution Approach 2:
The patent uses parameter changes by carefully controlling the concentration and distribution of the infrared absorbing agent in the organic planarization layer. By adjusting the amount of infrared absorbing material and its spatial distribution, the layer achieves optimal performance: sufficient absorption of external infrared light while maintaining adequate light transmission to the light receiving device. This parameter optimization balances the conflicting requirements of noise reduction and light detection.
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 integration of the infrared absorbing agent in the organic planarization layer enhances the electronic device's ability to reduce sensing noise and improve sensitivity by effectively blocking external infrared light, thereby maintaining the light emitting and receiving features without the need for additional light shielding components.
Implementation Method 1
an organic planarization layer disposed on the color filter layer and including an infrared absorbing agent
Data Source
AI summary
An electronic device includes: a base layer, a display device layer disposed on the base layer and including a pixel defining layer, a light emitting device, and a light receiving device, wherein the pixel defining layer includes an opening, and wherein the light emitting device and the light receiving are divided by the pixel defining layer; an input sensing layer disposed on the display device layer; a color filter layer disposed on the input sensing layer; and an organic planarization layer disposed on the color filter layer and including an infrared absorbing agent.