In-Cell Capacitive Touch Display Panel Frame Time Segmentation
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Solution Overview
Problem
Conventional in-cell capacitive touch display panels have a low report rate and touch control accuracy due to the integration of touch control and display driving functions, which affects the thickness and performance of portable display devices.
Innovation Solution
A control method and device that divide the time period for each image frame into display and touch control periods, where no signal or display signals are applied during the display period, and touch driving signals are applied during the touch control period, allowing touch sensing electrodes to couple voltage signals and improve report rate and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the touch screen is arranged outside of the display panel, then the touch control function is achieved, but the overall thickness increases
Solution Approach 1:
The patent merges the touch control function and display function into a single integrated panel structure. The touch sensing electrodes and display electrodes are combined within the same panel, eliminating the need for a separate external touch screen layer, thereby achieving touch control functionality while reducing overall thickness.
Solution Approach 2:
The patent implements multi-functionality by making the display panel itself serve both as the display medium and the touch sensing medium. The same panel structure performs dual functions: displaying images and detecting touch inputs, thus eliminating the need for additional external components.
2Measurement precision
If the time period for each image frame is divided into display period and touch control period, then the report rate and touch control accuracy are improved, but the time for each frame is increased
Solution Approach 1:
The patent employs periodic action by dividing each frame period into distinct display periods and touch control periods that alternate in a regular cycle. This periodic segmentation allows the system to dedicate specific time slots to touch sensing operations, improving measurement precision while maintaining overall frame timing through structured temporal organization.
Solution Approach 2:
The patent segments the frame time into multiple sub-periods: display periods for image rendering and touch control periods for sensing operations. This segmentation allows independent optimization of each function within its allocated time slot, improving touch control accuracy without requiring the entire frame time to be extended.
3Productivity
If touch driving signals are applied during the touch control period, then the report rate is improved, but interference with display signals may occur
Solution Approach 1:
The patent uses periodic action to separate touch driving signals and display signals into different time periods. By applying touch driving signals only during designated touch control periods and display signals during display periods, the system achieves high report rates through frequent touch sampling while preventing signal interference through temporal isolation.
Solution Approach 2:
The patent segments the signal application timeline into distinct touch control periods and display periods. This segmentation ensures that touch driving signals and display signals do not overlap in time, thereby maintaining high productivity through regular touch reporting while eliminating harmful signal interference through temporal separation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the report rate and touch control accuracy by alternating display and touch control periods, reducing interference and improving the dual functions of display and touch control in in-cell capacitive touch display panels.
Implementation Method 1
touch sensing electrodes couple voltage signals of the touch driving signals and output the same
Data Source
AI summary
The embodiments of the present disclosure disclose a control method and device for a touch display panel, and a display device, capable of achieving a display function and a touch control function of a display panel and improving the report rate for the touch control function. An embodiment of the disclosure discloses a control method for achieving a display function and a touch control function of an in-cell capacitive touch display panel, wherein the controlling method includes: dividing a time period for the in-cell capacitive touch display panel displaying each image frame into at least two control periods each comprising a display period and a touch control period; during the display period, applying no signal or applying signals for display to touch driving electrodes of the touch display panel; and during the touch control period, applying touch driving signals to the touch driving electrodes in sequence, wherein touch sensing electrodes couple voltage signals of the touch driving signals and output the same.