Fingerprint Sensing Display Layout for Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in securely recognizing user fingerprints for authentication, particularly in ensuring accurate detection and minimizing brightness differences between sensing and non-sensing areas, which affects the reliability and user experience.
Innovation Solution
The implementation of a display device with a sensing part that includes a matrix arrangement of sensing electrodes and circuits, where sensing electrodes are disposed in the display area and sensing circuits are in the non-display area, connected by sensing lines, and a dummy pattern in the non-sensing area to reduce brightness differences, allowing for differential driving voltages between sensing and non-sensing areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing electrodes are disposed in the display area overlapping the display area, then fingerprint recognition capability is improved, but brightness uniformity deteriorates due to differences between sensing and non-sensing areas
Solution Approach 1:
The patent applies local quality by differentiating the treatment of sensing and non-sensing areas. Dummy patterns are selectively disposed only in the non-sensing area to compensate for brightness differences, while the sensing area maintains its original structure for accurate fingerprint detection. This localized approach ensures that brightness uniformity is improved in the non-sensing area without interfering with the sensing function.
Solution Approach 2:
The dummy patterns are disposed in advance in the non-sensing area to preemptively counteract the brightness difference that would otherwise occur. By pre-establishing these compensatory patterns, the patent prevents the harmful effect of brightness non-uniformity before it affects display quality, while maintaining the sensing electrodes' ability to detect fingerprints accurately.
2Adaptability or versatility
If sensing circuits are disposed in the non-display area, then sensing electrode layout flexibility is improved, but device area increases
Solution Approach 1:
The patent utilizes the non-display area, which is a spatial dimension already present in the device structure, to accommodate sensing circuits. By placing sensing circuits in this unused or underutilized region rather than within the display area, the patent achieves flexible sensing electrode layout without significantly increasing the overall device footprint, as the non-display area is typically necessary for other functional components.
3Illumination intensity
If dummy patterns are disposed in the non-sensing area, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the dummy patterns with existing structural elements in the non-sensing area, such as combining them with buffer regions or other functional areas. This integration approach allows the dummy patterns to fulfill their brightness compensation function while simultaneously serving as part of the overall device structure, thereby minimizing the increase in device complexity.
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 the accuracy of fingerprint recognition while minimizing brightness differences, thereby improving security and user experience by ensuring reliable fingerprint detection and reduced operational complexity.
Implementation Method 1
the electrostatic capacitance type detects whether or not a touch occurs by using a capacitance that changes when a touch generating means contacts the screen of a display device
Data Source
AI summary
A display device includes: a display panel including a display area having a pixel and a non-display area disposed adjacent to the display area; a sensor including a sensing electrode overlapping the display area; a first pad electrically connected to the display panel; and a second pad electrically connected to the sensor, wherein the first pad and the second pad are disposed in the non-display area and are spaced apart from each other with the display area interposed therebetween.