Display Panel Storage Capacitor Nesting for Fingerprint Accuracy
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Solution Overview
Problem
Current display panels with fingerprint recognition functions suffer from low transmittance of light reflected by fingers, leading to reduced accuracy in fingerprint identification due to blocking effects from electrodes and storage capacitors, and excessive light leakage, particularly with red and green light.
Innovation Solution
The display panel incorporates organic light-emitting devices with specific electrode and light-emitting layer projections to minimize light blocking by positioning storage capacitors within electrode projections and optimizing the distance between electrode and light-emitting layer edges to reduce light leakage, ensuring more light is reflected and detected accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If storage capacitors are positioned outside the electrode projection area, then the manufacturing layout is simpler, but light blocking increases and fingerprint recognition accuracy decreases
Solution Approach 1:
The storage capacitor is nested within the projection area of the first electrode on the display panel plane. This nesting arrangement allows the capacitor to occupy space that would otherwise be unused, reducing light blocking while maintaining compact pixel structure and improving fingerprint recognition accuracy.
Solution Approach 2:
The solution transitions from a two-dimensional layout problem to a three-dimensional spatial arrangement by considering the projection relationships between components at different layers. By positioning the capacitor within the electrode's projection area rather than treating them as separate planar elements, the design optimizes light transmission paths.
2Area of stationary object
If the distance between electrode and light-emitting layer edges is small, then the display area is larger, but light leakage increases and affects fingerprint recognition
Solution Approach 1:
The patent applies different distance requirements to different color sub-pixels based on their specific light leakage characteristics. Red and green light-emitting layers are positioned at greater distances from their electrodes compared to blue, creating localized quality adjustments that reduce wavelength-specific light leakage while maintaining overall display area.
Solution Approach 2:
The patent optimizes the distance parameter between electrode edges and light-emitting layer edges for each color channel. By adjusting this geometric parameter differently for red, green, and blue sub-pixels, the design reduces light leakage in the fingerprint recognition spectrum while preserving display performance.
3Measurement precision
If conventional display panel structure is used, then the manufacturing process is standard, but light transmittance for fingerprint recognition is low
Solution Approach 1:
The storage capacitor is nested within the first electrode's projection area, creating a compact arrangement that improves light transmittance for fingerprint recognition while maintaining compatibility with standard manufacturing processes for organic light-emitting display panels.
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
This configuration enhances fingerprint recognition accuracy by reducing light blocking and leakage, particularly for red and green light, thereby improving the overall accuracy of fingerprint identification.
Implementation Method 1
Each of the plurality of pixel units includes organic light-emitting devices and driving units
Implementation Method 2
light emitted by a light source is reflected by a finger and then gets into the fingerprint recognition region
Implementation Method 3
the light reflected by the finger has a low transmittance within the display panel
Data Source
AI summary
A display panel is provided. The display panel includes a plurality of pixel units arranged in a fingerprint recognition region. Each of the plurality of pixel units includes a first electrode and a light-emitting layer. A driving unit of each pixel unit includes a storage capacitor. An orthographic projection of the storage capacitor on a plane of the display panel is located within an orthographic projection of the corresponding first electrode on the plane of the display panel. An orthographic projection of the light-emitting layer of each organic light-emitting device on the plane of the display panel is located within an orthographic projection of the corresponding first electrode. A distance between an edge of an orthographic projection of the first electrode and an edge of an orthographic projection of the light-emitting layer of each red and/or green organic light-emitting device is larger that of each blue organic light-emitting device.