Display Panel Fingerprint Sensors With Equalized Row Capacitance
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Solution Overview
Problem
Existing display devices with integrated fingerprint sensors experience differences in current sensing between odd-numbered and even-numbered pixel rows due to varying parasitic capacitances caused by unequal anode electrode areas, leading to inefficiencies and reliability issues in fingerprint sensing.
Innovation Solution
The display device is designed with equal anode electrode areas and differing shapes for odd-numbered and even-numbered pixel rows of fingerprint sensors, maintaining consistent parasitic capacitance and ensuring balanced current sensing across all rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fingerprint sensors are integrated into the display panel with different anode electrode areas for odd and even pixel rows, then the fingerprint sensing function is achieved, but current sensing differences occur between odd and even pixel rows
Solution Approach 1:
The patent applies local quality by making the anode electrodes of light receiving elements in odd-numbered pixel rows have a first area and those in even-numbered pixel rows have a second area, where the areas are deliberately different to compensate for parasitic capacitance variations. This local differentiation in electrode area ensures that parasitic capacitance values are equalized across all pixel rows, thereby achieving consistent current sensing for fingerprint recognition throughout the display panel.
2Measurement precision
If equal anode electrode areas are used for all fingerprint sensors, then current sensing consistency is improved, but parasitic capacitance differences between odd and even pixel rows persist
Solution Approach 1:
The patent applies parameter changes by modifying the area parameter of the anode electrodes in the light receiving elements. Specifically, it sets the anode electrode area in odd-numbered pixel rows to a first area and in even-numbered pixel rows to a second area, where these areas differ to compensate for parasitic capacitance variations. This parameter adjustment equalizes the parasitic capacitance across all pixel rows, ensuring reliable and consistent fingerprint sensing 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
This design enhances the efficiency and reliability of fingerprint sensing by equalizing parasitic capacitance, thereby improving the accuracy and consistency of fingerprint recognition.
Implementation Method 1
a light receiving element including a first electrode and a second electrode
Data Source
AI summary
A display device includes a display panel partitioned into pixel rows, and the display panel includes pixels and fingerprint sensors arranged on the pixel rows, a panel driver for driving the pixels, and a sensor driver for detecting a user fingerprint, based on a sensing signal from the fingerprint sensors. The fingerprint sensors may include first fingerprint sensors on an odd-numbered pixel row and second fingerprint sensors on an even-numbered pixel row, and an area of an anode electrode of a light receiving element in each of the first fingerprint sensors may be equal to an area of an anode electrode of a light receiving element included in each of the second fingerprint sensors.