In-cell Touch LCD Spatial Division Driving
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Solution Overview
Problem
Conventional in-cell touch type LCD devices face issues with reduced display time period and lowered touch sensitivity due to time-division of horizontal time period into touch and display time periods, leading to insufficient pixel voltage charging and gate overlap driving method limitations.
Innovation Solution
Implementing a gate overlap driving method that overlaps high-potential gate driving signals between neighboring gate lines, allowing a sufficient time for pixel voltage charging, and using a common voltage generator to apply direct current and alternating current waveforms to common lines for spatial division of touch and display operations, ensuring a touch time period and display time period overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-division method is used to separate touch time period and display time period, then touch sensing can be implemented, but display time period is reduced and picture quality deteriorates
Solution Approach 1:
The display panel is divided into multiple touch blocks (first touch block, second touch block, etc.) that can be independently controlled. Different touch blocks are driven at different times, allowing touch sensing and display operations to occur simultaneously in different spatial regions rather than competing for the same time period.
Solution Approach 2:
The patent transitions from time-division multiplexing (one touch block at a time) to spatial-division multiplexing (multiple touch blocks simultaneously). By adding the spatial dimension to the control strategy, the system can perform touch sensing in one touch block while maintaining display in another touch block, effectively resolving the time conflict.
2Reliability
If time-division method is used to separate touch and display operations, then touch sensing is enabled, but touch sensitivity is lowered due to insufficient charging time
Solution Approach 1:
The display region is segmented into multiple touch blocks with dedicated sensing lines. This segmentation allows each touch block to be fully charged during its designated time period while enabling simultaneous touch sensing in other blocks, thereby maintaining both sufficient charging time and high touch sensitivity.
Solution Approach 2:
By implementing spatial division, the system ensures continuous useful action across the entire display panel. While one touch block is being charged, other touch blocks are simultaneously performing touch sensing, eliminating idle time and maintaining continuous operational efficiency throughout the panel.
3Reliability
If conventional time-division driving is used, then touch block sensing is possible, but gate overlap driving method cannot be applied limiting productivity
Solution Approach 1:
The display panel is divided into multiple independently controllable touch blocks. This segmentation enables the application of gate overlap driving method within each touch block while maintaining overall touch sensing functionality, thereby improving driving efficiency and productivity without sacrificing sensing capability.
Solution Approach 2:
The patent merges the advantages of time-division multiplexing (for touch sensing) with the advantages of gate overlap driving method (for improved productivity). By combining these approaches through spatial division, the system achieves both reliable touch sensing and enhanced driving efficiency.
Data Source
AI summary
The present disclosure relates to a liquid crystal display (LCD) device, and particularly, to an in-cell touch type LCD device, and a method for driving capable of preventing deterioration of picture quality and enhancing touch sensitivity, by dividing a touch block in a spatial manner, not in a time manner.The in-cell touch type liquid crystal display (LCD) device, includes: an LCD panel including a first touch block and a second touch block having a plurality of gate lines and common lines; a gate driver for applying high-potential gate driving signals to the gate lines of the first touch block; a common voltage generator for supplying common voltages (Vcom) of first and second waveforms, to the common lines of the first and second touch blocks, respectively; and a touch detection circuit for detecting a touched position on the LCD panel through the second waveform common voltages.