OLED Display Panel Fingerprint Recognition Pulse Control
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Solution Overview
Problem
OLED display panels with fingerprint recognition functions face adverse effects on fingerprint recognition due to the dimming mode, where the light-emitting device does not emit light for extended periods, affecting the recognition process.
Innovation Solution
A display panel with a light-emitting scan driving circuit that outputs distinct pulse signals during fingerprint recognition and non-recognition phases, ensuring the light-emitting device emits light only when necessary for fingerprint recognition, thereby improving recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the light-emitting device uses dimming mode to control light-emitting state, then the service lifetime of the light-emitting device is improved, but the fingerprint recognition effect deteriorates due to extended non-emitting periods
Solution Approach 1:
The patent applies dynamics by making the light-emitting control adaptive and variable based on operational context. The light-emitting scan driving circuit dynamically adjusts the pulse signal period based on whether fingerprint recognition is being performed, transitioning between dimming mode (for normal display and extended lifetime) and continuous emission mode (for fingerprint recognition). This dynamic adaptation resolves the contradiction by allowing the system to optimize for lifetime during display and for recognition accuracy during authentication.
Solution Approach 2:
The patent changes the temporal parameter (period) of the pulse signal based on operational mode. During fingerprint recognition, the period of the pulse signal is extended to ensure continuous or frequent light emission for sensor detection. During normal display, the period is reduced to enable dimming mode for extended lifetime. This parameter adjustment resolves the contradiction by optimizing the light-emitting characteristics for the current operational requirement.
2Use of energy by moving object
If the light-emitting device periodically stops emitting light in dimming mode, then energy consumption is reduced, but the light availability for fingerprint recognition is insufficient
Solution Approach 1:
The system dynamically switches between energy-saving dimming mode and light-providing continuous emission mode based on fingerprint recognition requirements. The light-emitting scan driving circuit detects when fingerprint recognition is needed and adjusts the pulse signal accordingly, ensuring energy efficiency during normal operation and adequate illumination during authentication.
Solution Approach 2:
The system prepares for fingerprint recognition by adjusting the light-emitting pulse period in advance when recognition mode is activated. The control circuit anticipates the need for light during fingerprint scanning and modifies the emission pattern proactively, ensuring that sufficient light is available before the recognition process begins, rather than reacting after light deficiency is detected.
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
The solution enhances fingerprint recognition by extending the light-emitting period during fingerprint recognition phases and minimizing non-emitting times, improving the overall recognition effect while maintaining display functionality.
Implementation Method 1
a plurality of light-emitting devices; a plurality of fingerprint recognition sensors... the light-emitting device is used to achieve a display function and reused as a light source for fingerprint recognition
Data Source
AI summary
The present disclosure provides a display panel and a display device. The display panel includes: a plurality of light-emitting devices; a plurality of fingerprint recognition sensors; a plurality of pixel driving circuits each corresponding to one of the plurality of light-emitting devices; and a light-emitting scan driving circuit for controlling whether or not the plurality of light-emitting devices emit light. The light-emitting scan driving circuit is used to output a first pulse signal to a corresponding pixel driving circuit during a fingerprint recognition time phase, and to output a second pulse signal to a corresponding pixel driving circuit during a non-fingerprint recognition time phase. A period of the first pulse signal is different from a period of the second pulse signal.