Touch Driving Circuit Dynamic Sensing Time Optimization
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Solution Overview
Problem
Existing touch display devices face inefficiencies in touch sensing and data transmission, leading to unnecessary time wastage and potential data loss due to mismatched time intervals for sensing and data transmission in active pen touch systems.
Innovation Solution
A touch display device with a touch driving circuit that differentiates sensing time periods and data packet transmission based on the type of touch input, allowing for parallel sensing and data transmission while minimizing overlap and optimizing bit composition for efficient data transfer, including the transmission of Most Significant Bit (MSB) information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If touch sensing and data transmission are performed in parallel with fixed time intervals, then the system structure is simple, but unnecessary time is wasted and data transmission efficiency is reduced
Solution Approach 1:
The patent applies dynamics by making the sensing time period variable rather than fixed. The touch driving circuit dynamically adjusts the sensing time period based on the type of touch input detected - using a first sensing time period for finger touches and a second (shorter) sensing time period for pen touches. This dynamic adjustment allows the system to optimize data transmission efficiency while minimizing unnecessary sensing time for different input types.
Solution Approach 2:
The patent changes the time interval parameter based on the touch input type. By detecting whether the input is from a finger or an active pen, the system changes the sensing time period parameter accordingly - using a longer period for finger touches and a shorter period for pen touches. This parameter change resolves the contradiction by allowing efficient data transmission while reducing unnecessary sensing time for pen inputs.
2Productivity
If the sensing time period is shortened for pen data sensing, then data transmission efficiency is improved, but data loss may occur due to insufficient sensing time
Solution Approach 1:
The patent applies local quality by providing different sensing time periods for different types of touch inputs. Instead of using a uniform sensing time for all inputs, the system uses a first sensing time period for finger touches and a second (shorter) sensing time period specifically for pen touches. This localized optimization ensures that pen data transmission efficiency is improved without compromising the reliability of finger touch sensing.
Solution Approach 2:
The system dynamically selects the appropriate sensing time period based on the detected input type. When a pen touch is detected, the system switches to the shorter second sensing time period to improve transmission efficiency. When a finger touch is detected, it uses the longer first sensing time period to ensure reliable data capture. This dynamic adaptation resolves the contradiction between efficiency and reliability.
3Ease of operation
If sensing data from multiple touch sensors is transmitted as separate data packets, then each packet can be processed independently, but the overall transmission time increases
Solution Approach 1:
The patent merges multiple sensing data packets into a single composite data packet for transmission. Instead of transmitting data from each touch sensor as separate packets, the system combines them into one unified packet that contains all the sensing information. This merging approach significantly reduces the total transmission time while maintaining the integrity and processability of the data.
Solution Approach 2:
The composite data packet structure is designed to universally handle data from multiple touch sensors simultaneously. The single packet can accommodate information from various sensor types (finger touches, pen touches, coordinate data, pressure data) in a unified format, allowing the touch controller to process all inputs efficiently without requiring separate transmission channels.
Data Source
AI summary
The present disclosure provides a touch display device and a touch driving circuit which support touch sensing of an active pen, and a method of driving the same. Sensing data acquired during a first sensing time period in a pen position sensing section may be transmitted as one data packet, and a plurality of pieces of sensing data acquired during a second sensing time period shorter than the first sensing time period in a pen data sensing section may be transmitted as one data packet, so that it is possible to reduce an unnecessary sensing time period when pen data is sensed, while preventing sensing data transmission sections from overlapping each other. In addition, information about a Most Significant Bit (MSB) of the sensing data to be transmitted when the sensing data is transmitted may be transmitted in the pen data sensing section, so that it is possible to easily restore the sensing data while minimizing a loss of the sensing data.