Display-Sensor Frame Timing for Active Pen Noise Separation
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Solution Overview
Problem
Existing electronic devices face challenges in accurately sensing inputs, particularly from active pens, due to noise interference and varying operating frequencies, which affect sensing reliability.
Innovation Solution
The electronic device employs a display and sensor layer configuration with a display driver operating at different frequencies in various frames and a sensor driver that switches modes based on signal characteristics, allowing for noise differentiation and precise input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display driver operates at a high frame rate to ensure smooth display performance, then display quality is improved, but noise signals interfere with sensor layer sensing accuracy
Solution Approach 1:
The frame period is divided into a data period for display operations and a blank period for sensor sensing operations. By segmenting the time period, the display driver can operate at high frame rates during the data period while the sensor layer performs noise-free sensing during the blank period, resolving the contradiction between display quality and sensing accuracy.
Solution Approach 2:
The system implements periodic switching between display operation mode and sensor sensing mode within each frame period. The sensor driver is configured to sense inputs during the blank period when display data transmission is complete, creating a periodic action pattern that allows both high-frame-rate display and accurate sensing without mutual interference.
2Speed
If the sensor driver continuously senses inputs to maintain real-time detection, then input responsiveness is improved, but noise signals from display operations interfere with sensing reliability
Solution Approach 1:
The system performs preliminary display data transmission during the data period, then utilizes the subsequent blank period for sensor sensing. This preliminary action ensures that display operations are completed before sensing begins, allowing the sensor driver to detect inputs in real-time while avoiding noise interference from ongoing display operations.
Solution Approach 2:
The blank period acts as an intermediary time slot between display data transmission and sensor sensing. This intermediary period allows the sensor layer to receive downlink signals from input devices without interference from display operations, ensuring both responsive input detection and high sensing reliability.
3Use of energy by moving object
If the display operates at variable frame rates to optimize power consumption, then energy efficiency is improved, but sensing consistency across different operating conditions becomes difficult to maintain
Solution Approach 1:
The system dynamically adjusts the frame rate based on display content requirements while maintaining a consistent sensing mechanism. The sensor driver operates in synchronization with the display driver, utilizing blank periods from variable frame rate displays to maintain consistent sensing performance across different operating conditions, thus achieving both energy efficiency and sensing consistency.
Solution Approach 2:
The sensor driver receives feedback signals from the display driver through the vertical synchronization signal, allowing it to adjust sensing operations based on actual display frame rate changes. This feedback mechanism ensures that sensing remains consistent and reliable regardless of variable frame rates, while the system optimizes power consumption through dynamic frame rate adjustment.
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 approach enhances sensing reliability by distinguishing noise signals from valid inputs, improving the accuracy of detecting coordinates from active pens and other inputs.
Implementation Method 1
The electronic device may recognize coordinates of a pen in an electromagnetic resonance (EMR) scheme
Implementation Method 2
The electronic device may recognize coordinates of a pen in an electromagnetic resonance (EMR) scheme or an active electrostatic (AES) scheme
Data Source
AI summary
An electronic device includes a display layer configured to display an image, a sensor layer on the display layer configured to receive a downlink signal from an input device, a display driver configured to drive the display layer and a sensor driver configured to control the sensor layer and operate in a first mode and a second mode. In the first mode, the display driver is configured to drive the display layer in a first frame having a first operating frequency. In the second mode, the display driver is configured to drive the display layer in a second frame having a second operating frequency lower than the first operating frequency. The second frame includes a first write period and a first blank period. In the second mode, the sensor driver is configured to receive the downlink signal during a period overlapping with the first blank period.