Touch Sensor Scan Signal Segmentation for Flat Displays
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Solution Overview
Problem
The touch-detecting capability of flat displays with integrated touch functions is limited due to low sensor density, making it difficult for sensors to detect touches accurately, especially when touched regions are far from corresponding sensors, without being able to significantly increase the storage capacity of the detect circuit.
Innovation Solution
The solution involves adjusting the scan signal to include a first and second turn-on pulse, allowing multiple sensors to be simultaneously turned on and coupled to different scan lines, effectively increasing sensor density without increasing the storage capacity of the detect circuit, thereby improving touch-detecting capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor density is increased to improve touch-detecting capability, then touch detection accuracy is improved, but storage capacity of detect circuit must be increased
Solution Approach 1:
The scan signal is segmented into multiple turn-on pulses (first turn-on pulse and second turn-on pulse) that sequentially activate different groups of sensors. This segmentation allows the system to handle higher sensor density by processing sensor data in discrete time segments rather than simultaneously, avoiding the need to increase storage capacity.
Solution Approach 2:
The system employs periodic scanning with multiple turn-on pulses within each scanning period. Sensors are activated in periodic cycles where different groups of sensors are turned on at different times within the same period, enabling high-density sensor arrays to be managed with fixed storage capacity through time-division multiplexing.
2Measurement precision
If multiple sensors are simultaneously turned on to improve touch detection, then touch-detecting capability is improved, but the amount of detect signals increases requiring larger storage
Solution Approach 1:
The scan signal uses periodic turn-on pulses to activate sensors in sequential groups rather than all at once. Within each scanning period, the first turn-on pulse activates one group of sensors while the second turn-on pulse activates another group, ensuring that only a manageable number of sensors are active simultaneously, thus controlling the amount of detect signals generated.
Solution Approach 2:
The system dynamically controls sensor activation states through multiple turn-on pulses, transitioning sensors between active and inactive states in a controlled sequence. This dynamic control ensures that sensors are activated only when needed and in limited groups, optimizing touch detection capability while managing signal volume.
Data Source
AI summary
A touch device is disposed on a substrate having a plurality of scan lines. The touch device comprises a plurality of readout lines and a plurality of sensors. The readout lines and the scan lines are intersected with each other, and the sensors are electrically coupled to the corresponding scan lines and the corresponding readout lines respectively. A scan signal is introduced into the scan lines in sequence to control whether turning on the sensors, and the scan signal comprises at least one first turn-on pulse and a second turn-on pulse to simultaneously turn on at least two sensors which are electrically coupled to different scan lines.