Touch Display Readout Synchronization for Accurate Input Sensing
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Solution Overview
Problem
Existing display devices struggle with inaccurate sensing of user inputs, particularly in touch-based input methods, leading to inefficiencies in user interaction.
Innovation Solution
The display device incorporates a master readout circuit and a slave readout circuit, connected via sensing electrodes, to synchronize and process input signals, allowing for precise calculation of input positions using a synchronization signal and reception signals from both circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single readout circuit is used to sense user input, then the device complexity is reduced, but the sensing accuracy deteriorates
Solution Approach 1:
The input sensor is divided into multiple regions with separate readout circuits. The first readout circuit senses input in a first region while the second readout circuit senses input in a second region, allowing parallel processing and improved accuracy without requiring a single complex circuit to handle the entire sensor area
2Measurement precision
If multiple readout circuits are used to sense user input, then the sensing accuracy is improved, but the device complexity increases
Solution Approach 1:
Multiple readout circuits are merged into a unified sensing system where the first and second readout circuits operate cooperatively. The host processor integrates signals from both circuits to determine touch position, combining their capabilities to achieve high accuracy while managing system complexity through coordinated operation
3Area of stationary object
If sensing lines are densely arranged to cover the entire sensing area, then the sensing coverage is improved, but the signal interference increases
Solution Approach 1:
The sensing lines are segmented into first sensing lines connected to the first readout circuit and second sensing lines connected to the second readout circuit. This segmentation reduces signal interference by isolating signal paths while maintaining comprehensive sensing coverage across the entire display panel
Data Source
AI summary
Disclosed is a display device including a display panel, an input sensor that is disposed on the display panel and that includes sensing electrodes, a master readout circuit that is electrically connected with a first portion of the sensing electrodes and that generates first reception signals corresponding to a signal received from the first portion of the sensing electrodes, and a slave readout circuit that is electrically connected with the a second portion of the sensing electrodes and that generates second reception signals corresponding to a signal received from the second portion of the sensing electrodes. The master readout circuit provides a synchronization signal to the slave readout circuit, and the slave readout circuit operates in response to the synchronization signal and provides a sensing signal corresponding to the second reception signals to the master readout circuit.