Simultaneous Touch Sensing and Display Driving in Panel
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Solution Overview
Problem
Conventional touch-sensing technologies face challenges in balancing touch and display driving times, leading to poor touch sensitivity and increased circuit complexity, as they typically allocate time intervals exclusively for either touch or display operations.
Innovation Solution
A display device that simultaneously performs display update and touch sensing in some intervals, utilizing a combination of sensor electrodes, display electrodes, sensor-driving circuits, and data-driving circuits to manage ground voltages and timing signals, allowing for extended touch and display driving times without compromising sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch interval is extended to improve touch sensitivity and SNR, then the display interval becomes shorter, requiring more circuit components for display
Solution Approach 1:
The patent merges touch sensing and display driving operations by having the sensor-driving circuit and data-driving circuit operate simultaneously during the same time interval. This integration allows touch sensing to be performed without sacrificing display time, thereby improving touch sensitivity without increasing the number of circuit components.
Solution Approach 2:
The patent makes the driving circuits multi-functional by enabling them to perform both touch sensing and display driving functions within the same operational interval. The sensor-driving circuit and data-driving circuit are designed to operate concurrently, allowing the system to achieve both touch sensitivity and display performance without requiring separate dedicated time intervals.
2Measurement precision
If the touch interval is extended to improve SNR, then the display interval becomes shorter, potentially affecting display performance
Solution Approach 1:
The patent combines touch sensing and display driving into a simultaneous operation during the same time interval. This merging eliminates the need to choose between extending touch interval for better SNR or maintaining display interval for display performance, as both functions are performed together without time allocation conflicts.
Solution Approach 2:
The patent ensures continuous operation of both touch sensing and display driving without interrupting either function. By operating the sensor-driving circuit and data-driving circuit simultaneously throughout the driving interval, the system maintains continuous useful action for both touch sensitivity measurement and display refresh, avoiding the trade-off between SNR improvement and display interval reduction.
3Measurement precision
If the number of sensors is increased to improve touch sensitivity while maintaining display interval, then the device complexity increases
Solution Approach 1:
The patent merges the operational time of touch sensing and display driving, allowing the existing sensor array to operate for a longer effective duration without increasing the number of sensors. This temporal merging compensates for the lack of additional sensors by maximizing the utilization of existing sensor resources, thereby improving touch sensitivity without increasing device complexity.
Solution Approach 2:
The patent dynamically utilizes the existing sensor and circuit resources by allowing them to operate in a combined mode that serves dual purposes. Instead of statically allocating separate time intervals for touch and display, the system dynamically shares the operational time, enabling existing sensors to effectively perform touch sensing with enhanced sensitivity without requiring additional sensor elements.
Data Source
AI summary
The present invention provides a display device that simultaneously conducts display updates and touch sensing in some regions. The display device according to one aspect of the present invention comprises: a plurality of sensor electrodes for sensing approaches or touches of an object; a plurality of display electrodes for forming a data voltage in each pixel in conjunction with the sensor electrodes; a sensor driving circuit for supplying a first sensor electrode with a sensor driving signal; and a data driving circuit for supplying a first display electrode with a data signal which changes in response to the sensor driving signal so that the voltage between the first sensor electrode and the first display electrode becomes a first data voltage.