Transparent Anode OLED Panel for Optical Fingerprint Sensor Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light-emitting display panels face challenges in implementing a fingerprint recognition function due to the large area required for the fingerprint recognition region, which limits the design of narrow borders and results in poor light transmission to the fingerprint recognition sensor due to opaque anode layers.
Innovation Solution
Incorporating transparent electrodes for at least some light-emitting devices in the fingerprint recognition region, allowing reflected light to be transmitted to an optical fingerprint recognition sensor while maintaining normal light-emitting functionality, and optimizing the structure to reduce light blocking by pixel driving circuits and metal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If opaque anode layers are used in light-emitting devices, then light emission efficiency is improved, but light transmittance to the fingerprint recognition sensor deteriorates
Solution Approach 1:
The patent applies local quality by using transparent electrodes specifically in the fingerprint recognition region while maintaining opaque electrodes in other display regions. This allows the anode structure to have different optical properties in different locations: transparent where fingerprint recognition is needed and opaque where light emission efficiency is prioritized.
Solution Approach 2:
The display region is segmented into a fingerprint recognition region and a non-fingerprint recognition region. The anode structure is accordingly divided, with transparent electrodes in the fingerprint recognition region and opaque electrodes in the non-fingerprint recognition region, allowing each segment to optimize for its specific function.
2Measurement precision
If a large area fingerprint recognition region is used, then fingerprint recognition accuracy is improved, but the border region area required increases
Solution Approach 1:
The display region is designed to serve multiple functions: it acts as both the display area and the fingerprint recognition region. By making the entire display region capable of fingerprint recognition through the transparent electrode structure, the need for a separate border region for fingerprint sensing is eliminated, achieving multi-functionality.
Solution Approach 2:
The patent merges the fingerprint recognition function with the display region by using transparent electrodes that allow light to pass through to the sensor while maintaining display functionality. This combines what were previously separate functions (display and fingerprint recognition) into a single integrated region.
3Illumination intensity
If transparent electrodes are used in fingerprint recognition region, then light transmittance to sensor is improved, but display brightness may be reduced
Solution Approach 1:
Transparent electrodes are applied locally only in the fingerprint recognition region rather than throughout the entire display. This localized application minimizes the impact on overall display brightness while maximizing light transmittance where needed for fingerprint recognition.
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
Enhances the accuracy of fingerprint recognition by increasing light transmittance to the sensor and maintaining display performance, facilitating the design of narrower borders and reducing power consumption and potential brightness differences between color sub-pixels.
Implementation Method 1
In the fingerprint recognition region, at least a part of the plurality of light-emitting devices each have an anode that is a transparent electrode
Implementation Method 2
an optical fingerprint recognition sensor located in the fingerprint recognition region and located at a side of the driving device layer facing away from the anode layer
Data Source
AI summary
An organic light-emitting display panel has a display region including a fingerprint recognition region and light-emitting devices for displaying image, the display panel includes a driving device layer, an anode layer, a pixel definition layer, an organic light-emitting layer, and a cathode layer sequentially stacked; and an optical fingerprint recognition sensor located in the fingerprint recognition region and located at a side of the driving device layer away from the anode layer; the pixel definition layer includes sub-pixel openings corresponding to the light-emitting devices, each light-emitting device includes an anode corresponding to one sub-pixel opening, the anode being located in the anode layer and overlapping with a corresponding sub-pixel opening, the organic light-emitting layer is located in each sub-pixel opening, and the cathode layer overlaps with each sub-pixel opening; in the fingerprint recognition region, at least part of the light-emitting devices each have an anode being a transparent electrode.