Fingerprint Cascade Scanning Circuit for Narrow Bezel Display Panels
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Solution Overview
Problem
Existing optical fingerprint identification solutions for display devices face challenges in increasing the screen-to-body ratio while incorporating fingerprint identification, as they require a large number of signal wires that exceed the maximum size limitations of integrated circuit chips, making them impractical for designs with narrow bezels.
Innovation Solution
A display panel with a fingerprint-identification cascade scanning circuit disposed in the border region, which generates scanning signals for fingerprint identification circuits, reducing the number of signal wires connected to the integrated circuit chip and allowing for a smaller IC chip design that meets size requirements, thereby reducing bezel width and enhancing wiring feasibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional 3T1D or 4T1D drive circuits are used for fingerprint identification, then fingerprint identification function is achieved, but the number of signal wires increases excessively, causing IC chip size to exceed maximum design limits
Solution Approach 1:
The patent divides the fingerprint scanning process into multiple segments by introducing cascade scanning circuits. Instead of connecting all fingerprint scanning lines directly to the IC chip, the scanning lines are segmented into multiple groups, each served by a separate cascade scanning circuit module. This segmentation reduces the number of wires directly connected to the IC chip from dozens to just a few control wires.
Solution Approach 2:
The patent introduces cascade scanning circuits as intermediary components between the IC chip and the fingerprint scanning lines. These intermediary circuits receive compact control signals from the IC chip and generate the appropriate scanning signals for multiple fingerprint scanning lines, acting as a bridge that reduces wire complexity while maintaining full functionality.
2Area of stationary object
If more signal wires are connected to the IC chip to support larger fingerprint identification regions, then the fingerprint identification region size increases, but the IC chip size exceeds the allowed maximum
Solution Approach 1:
The patent segments the fingerprint identification region into multiple scanning zones, each controlled by a cascade scanning circuit. This allows the IC chip to control a large fingerprint region through a small number of control wires that drive multiple cascade circuits, which in turn control numerous scanning lines across the entire fingerprint identification area.
Solution Approach 2:
The patent extends the control architecture into a hierarchical dimension, with the IC chip at the top level controlling multiple cascade scanning circuits at an intermediate level, which then control numerous scanning lines at the bottom level. This dimensional hierarchy allows management of a large number of scanning lines through a small number of IC chip output wires.
3Length of stationary object
If the number of scanning drive signal lines is reduced to meet IC chip size requirements, then bezel width can be reduced, but wiring complexity in the border region must be managed
Solution Approach 1:
The patent segments the wiring task into two parts: simple control wire routing from the IC chip to cascade scanning circuits (handled by the standardized interface), and local scanning line distribution from cascade circuits to fingerprint scanning lines (handled within the border region). This segmentation makes the wiring more manageable and feasible for narrow bezel designs.
Solution Approach 2:
The cascade scanning circuits serve multiple functions: they receive control signals from the IC chip, generate scanning signals for multiple fingerprint scanning lines, and can be positioned flexibly in the border region. This multi-functionality simplifies the overall wiring architecture and improves manufacturability.
Data Source
AI summary
Provided are a display panel and display device. The display panel includes a display region and a border region. The border region is provided with a display cascade scanning circuit and a fingerprint-identification cascade scanning circuit. The display region is provided with multiple display scanning lines and multiple fingerprint scanning lines. The display cascade scanning circuit is electrically connected to the multiple display scanning lines and configured to output display scanning signals to the multiple display scanning lines respectively. The fingerprint-identification cascade scanning circuit is electrically connected to the multiple fingerprint scanning lines and configured to generate and output fingerprint scanning signals to the multiple fingerprint scanning lines respectively. The fingerprint-identification cascade scanning circuit includes a first fingerprint-identification cascade scanning circuit and a second fingerprint-identification cascade scanning circuit that are disposed at two opposite sides of the display region.