Display Sensor Driving Method for Noise Reduction
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Solution Overview
Problem
Display devices face issues with parasitic capacitance between sensors and pixels, leading to erroneous sensing results due to interference from display signals, which affects the signal-to-noise ratio (SNR) during proximity sensing.
Innovation Solution
A display device and driving method that manage sensing and display signals by adjusting the number and timing of sensing and light emitting periods, with a sensor driver transmitting signals during non-light emitting periods and applying higher weight values to sampling signals during these periods to reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing signals are transmitted continuously to improve sensing accuracy, then sensing data quality improves, but noise interference from display signals increases due to parasitic capacitance
Solution Approach 1:
The patent applies periodic action by transmitting sensing signals only during non-light emitting periods of the display, creating a periodic sensing pattern that avoids interference. The sensor driver alternates between sensing mode during non-light emitting periods and idle mode during light emitting periods, thereby periodically acquiring sensing data when the display part does not generate interfering signals.
Solution Approach 2:
The patent extracts the sensing operation from continuous operation and isolates it to specific time windows (non-light emitting periods). By separating sensing operations from display operations in time, the harmful interference from display signals is eliminated while maintaining sensing functionality.
2Measurement precision
If the number of non-light emitting periods is increased to improve sensing signal quality, then signal-to-noise ratio improves, but display brightness control flexibility decreases
Solution Approach 1:
The patent implements dynamics by making the number of non-light emitting periods (t) adjustable and configurable based on different operating conditions. The system can dynamically adapt the sensing parameters and non-light emitting period configuration to balance sensing accuracy requirements with display performance requirements, allowing flexibility in different usage scenarios.
Solution Approach 2:
The patent applies parameter changes by allowing the number of non-light emitting periods to be modified according to different modes (where q > p in second mode compared to first mode). This parameter adjustment enables optimization of signal-to-noise ratio while maintaining display functionality through coordinated control of sensing and display parameters.
3Area of stationary object
If sensing signals are transmitted in units of more sensors (q > p) to improve sensing coverage, then sensing area coverage improves, but signal interference from parasitic capacitance increases
Solution Approach 1:
The patent uses periodic action to transmit sensing signals to larger groups of sensors (q sensors) only during non-light emitting periods. By timing the expanded sensing operation to coincide with periods when display signals are not active, the system achieves broader sensing coverage without suffering from increased parasitic capacitance interference that would occur with continuous operation.
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 the signal-to-noise ratio (SNR) of sensing data by minimizing noise from the display part, improving the accuracy of proximity sensing and touch detection.
Implementation Method 1
a sensor part (120) including a plurality of sensors (SC)
Implementation Method 2
a display part (110) overlapping the sensor part (120) and including a plurality of pixels (PX)
Data Source
AI summary
A display device including: a sensor part including sensors; a sensor driver that transmits a sensing signal to p sensors of a first area of the sensor part in a first mode and a sensing signal to q sensors in the first area in a second mode; and a display driver that transmits a light emitting signal to pixels for the pixels to have s non-light emitting periods during one frame period in the first mode, and the light emitting signal to the pixels for the pixels have t non-light emitting periods during the one frame period in the second mode, wherein p is an integer larger than 0, q is an integer larger than p, s and t are integers larger than 1, and a sum of lengths of the t non-light emitting periods is larger than a sum of lengths of the s non-light emitting periods.