Display Sensor Timing for Touch and Fingerprint Separation
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Solution Overview
Problem
Existing electronic devices face challenges in achieving reliable sensing of both touch inputs and biometric information, particularly in environments where multiple inputs are detected simultaneously, leading to interference and reduced accuracy.
Innovation Solution
The electronic device incorporates a display layer with a pixel driving circuit and light emitting elements, a sensor layer with sensing electrodes, and a fingerprint controller to separately process touch and biometric inputs during different frame periods, utilizing a sensor controller to coordinate signal exchange and enhance sensing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sensor layer and sensor operate simultaneously to detect both touch inputs and biometric information, then the device can process multiple inputs in parallel, but interference occurs between the two sensing functions leading to reduced accuracy
Solution Approach 1:
The sensing operations are segmented into distinct time periods within frame periods. The sensor layer performs touch sensing during first frame periods while the sensor performs biometric sensing during second frame periods. This temporal segmentation eliminates interference between the two sensing functions while maintaining parallel processing capability across different time slots.
Solution Approach 2:
The system implements periodic switching between touch sensing mode and biometric sensing mode. The sensor layer and sensor are activated in alternating periodic intervals, with each frame period dedicated to one specific sensing function. This periodic action ensures that both sensing operations can coexist without mutual interference, as they operate in non-overlapping time windows.
2Measurement precision
If separate sensing operations for touch and biometric information are performed in different time periods, then interference between sensing functions is eliminated, but the overall processing time increases
Solution Approach 1:
The sensing system operates continuously without idle periods. Each frame period is fully utilized for either touch sensing or biometric sensing, ensuring that the sensor resources are constantly productive. By eliminating gaps between sensing operations and maintaining continuous alternating action, the system minimizes overall processing time while preserving sensing accuracy through dedicated time periods for each function.
Data Source
AI summary
An electronic device includes: a display layer including a pixel including a pixel driving circuit and a light emitting element, and a sensor including a sensor driving circuit and a sensing element, and displaying an image during a plurality of frame periods; a sensor layer on the display layer and exchanging a signal with an input device and sensing an input by a touch; a fingerprint controller controlling the sensor; and a sensor controller controlling the sensor layer, wherein the sensor is configured to sense a first input by the input device, and a second input by a biometric information, wherein, in response to the sensor layer sensing the signal, the sensor controller transmits a control signal to the fingerprint controller, and wherein the fingerprint controller is configured to provide the sensor controller with information of the first input sensed by the sensor.