Touch Driving Block Segmentation for Display Frame Rate Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices face inaccuracies and reduced speed in touch sensing operations due to insufficient charging time of touch sensor driving lines at high display frame rates and decreased speed at low frame rates, as they perform touch sensing at the same frame rate as the display frame rate.
Innovation Solution
A method and apparatus that determine the display frame rate and adjust the number of touch driving blocks, grouping driving lines into these blocks and driving one block per frame, ensuring accurate and efficient touch sensing regardless of frame rate changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the display frame rate is increased to reduce power consumption, then power consumption is reduced, but the charging time for touch sensor driving lines becomes insufficient
Solution Approach 1:
The touch sensor driving lines are divided into multiple touch driving blocks. Each block is charged sequentially during the display frame period, allowing the system to maintain high display frame rates while ensuring each block receives sufficient charging time through time-division multiplexing.
Solution Approach 2:
The driving voltage is applied to each touch driving block before the touch sensing operation begins. This preliminary charging action ensures that the driving lines are fully charged within the available time budget, enabling accurate touch sensing even at high display frame rates.
2Speed
If the display frame rate is decreased to increase touch sensing speed, then touch sensing speed is improved, but the touch sensing operation becomes inaccurate
Solution Approach 1:
By segmenting the driving lines into multiple blocks and charging them sequentially, the system can maintain high display frame rates while ensuring each block receives adequate charging time. This segmentation allows touch sensing to operate at the display frame rate without sacrificing accuracy.
Solution Approach 2:
The system dynamically adjusts the number of touch driving blocks based on the display frame rate. When the display frame rate changes, the controller recalculates and reconfigures the blocking scheme to optimize both charging time and sensing speed, maintaining accuracy across varying operating conditions.
3Stability of the object's composition
If touch sensing is performed at the same frame rate as the display frame rate, then synchronization is maintained, but charging time becomes insufficient at high frame rates
Solution Approach 1:
The touch sensor driving lines are divided into multiple touch driving blocks. Each block is charged sequentially during the display frame period, allowing the system to maintain high display frame rates while ensuring each block receives sufficient charging time through time-division multiplexing.
Solution Approach 2:
The controller periodically charges each touch driving block in sequence within each display frame period. This periodic charging action ensures that all blocks receive adequate charging time while maintaining synchronization with the display frame rate, as the complete cycle of charging all blocks is completed within one display frame period.
Data Source
AI summary
A method of sensing a touch in a display apparatus includes: determining a display frame rate of an input image applied to the display apparatus; determining a number of touch driving blocks according to the display frame rate; and sensing a touch based on driving one touch driving block of the determined touch driving blocks at each display frame.