Display Device Sensing Part Electrode Configuration for Accuracy
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Solution Overview
Problem
Current fingerprint sensing technologies in display devices face challenges in achieving high accuracy due to variations in sensor placement and electrode configurations, leading to inconsistencies in sensing sensitivity and accuracy.
Innovation Solution
The implementation of a display device with a sensing part that includes a first sensor and a second sensor, each with specific electrode configurations and connections, where the sensors are strategically placed along diagonal directions and between pixels, ensuring equal or varying lengths of connecting electrodes to minimize parasitic capacitance differences and enhance sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensors are placed at different positions with varying electrode configurations, then the sensing area can be increased, but the sensing accuracy deteriorates due to variations in parasitic capacitance
Solution Approach 1:
The patent applies local quality by making the connecting electrodes of the first and second sensors have equal lengths specifically, while other parts of the sensing structure can have different configurations. This localized adjustment ensures that parasitic capacitance values are equalized at the critical connection points, thereby maintaining sensing accuracy across different sensor positions while still allowing for expanded sensing coverage through multiple sensors arranged in different orientations.
2Adaptability or versatility
If connecting electrodes have different lengths to accommodate various sensor placements, then the device can support more sensor configurations, but the sensing sensitivity consistency deteriorates
Solution Approach 1:
The patent applies equipotentiality by ensuring that connecting electrodes have equal lengths, which equalizes the parasitic capacitance values at the connection points between light receiving elements and transistors. This creates equivalent electrical conditions for both sensors despite their different orientations and positions, thereby maintaining consistent sensing sensitivity across all sensor configurations while still allowing for adaptable sensor placement.
3Reliability
If the first-first electrode extends further in the second direction, then the connection reliability is improved, but the parasitic capacitance increases affecting sensing accuracy
Solution Approach 1:
The patent applies parameter changes by precisely controlling the length of the first-first electrode that extends in the second direction. The electrode is designed to extend only to a specific extent - far enough to ensure reliable electrical connection between the light receiving element and the transistor, but not so far as to create excessive parasitic capacitance. This optimized parameter setting achieves the balance between connection reliability and sensing accuracy.
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 improves the sensing accuracy by maintaining similar capacitance in both sensors, reducing sensing sensitivity deviations and enhancing overall fingerprint sensing performance.
Implementation Method 1
a first light receiving element... a first light receiving layer between the first-first electrode and the second electrode of the first light receiving element
Data Source
AI summary
A display device includes: a first pixel unit including a first sensor; and a second pixel unit including a second sensor. The first sensor includes: a first light receiving element; a first-first transistor connected to the first light receiving element; and a first connecting electrode connecting the first light receiving element to the first-first transistor, and extending in a first direction from a first connection point with the first light receiving element. The second sensor includes: a second light receiving element; a first-second transistor connected to the second light receiving element; and a second connecting electrode connecting the second light receiving element to the first-second transistor, and extending in the first direction and a direction opposite to the first direction from a second connection point with the second light receiving element.