Shift Register Circuit for Shared Display and Fingerprint Drive
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Solution Overview
Problem
The integration of fingerprint sensors into display panels requires two independent sets of drive circuits, leading to increased border size and manufacturing costs due to complex wiring and additional metal layers, as the enabling times of scan signals for the fingerprint sensor module and the display panel differ.
Innovation Solution
A shift register circuit that includes dummy shift registers, module selection switches, and output selectors, allowing the display panel and fingerprint sensor module to share the same set of shift registers, thereby reducing border size and eliminating line crossing issues by coordinating enabling periods and signal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two independent sets of drive circuits are configured for the display panel and fingerprint sensor module, then the independent operation of scan signals is ensured, but the border size increases and wiring becomes complicated
Solution Approach 1:
The patent merges the drive circuits for the display panel and fingerprint sensor module into a single shared drive circuit. The shift register circuit generates scan signals that can be selectively routed to either the display panel or the fingerprint sensor module through multiplexing, eliminating the need for two separate drive circuits and reducing wiring complexity while maintaining independent operation capability
Solution Approach 2:
The shared drive circuit is designed with multi-functionality to serve both the display panel and fingerprint sensor module. The shift register circuit can operate in different modes to generate scan signals for either device, and the multiplexing mechanism enables a single drive circuit to perform the functions that previously required two separate circuits
2Reliability
If two independent sets of drive circuits are configured, then signal independence is maintained, but additional metal layers and multiple pitches are required
Solution Approach 1:
By combining the drive circuits into one shared system, the patent eliminates the need for additional metal layers and multiple pitches that would be required for routing two separate sets of signal lines. The multiplexing mechanism allows signal independence to be maintained through time-division or selection-based routing rather than spatial separation
3Adaptability or versatility
If two sets of shift registers are used, then separate signal generation is achieved, but line crossing occurs and border increases
Solution Approach 1:
The patent merges the shift register systems into a single shared shift register circuit that generates scan signals for both the display panel and fingerprint sensor module. This eliminates line crossing issues that occur when two separate shift registers are routed across the panel, and reduces the overall border size by eliminating redundant wiring paths
Data Source
AI summary
A shift register circuit includes a first dummy shift register, a second dummy shift register, multiple shift registers, multiple module selection switches, and multiple output selectors. The shift registers are connected in series between the first dummy shift register and the second dummy shift register, and are divided into a plurality of shift register groups. The module selection switches jointly receive a module selection signal, and are respectively coupled between the first dummy shift register and the shift register groups or between the shift register groups. The output selectors are respectively coupled between an output terminal of the corresponding one of the first dummy shift register, the shift registers, and the second dummy shift register, and a display panel and a fingerprint sensor module.