Panel Driving IC for Simultaneous Display and Touch Sensing
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Solution Overview
Problem
Conventional touch-sensing technologies for touch panels, such as the in-cell type, face limitations in allocating sufficient time for both display driving and touch driving, resulting in poor touch sensitivity due to short touch intervals and increased circuit components or sensor numbers.
Innovation Solution
A display driving apparatus and device that incorporates a data driving circuit, sensing circuit, and reference voltage conversion circuit, allowing for simultaneous or extended time allocation for both display and touch driving by converting reference voltages and signals between different ground voltages, enabling efficient data and sensing signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch interval is extended to improve touch sensitivity, then the signal-to-noise ratio increases, but the display interval becomes shorter
Solution Approach 1:
The frame time is divided into distinct display interval and touch interval segments, allowing independent optimization of each function. The data driving circuit processes image data during the display interval while the sensing circuit performs touch sensing during the touch interval, enabling both functions to operate with adequate time allocation without interfering with each other.
Solution Approach 2:
The system employs periodic alternation between display driving and touch driving modes. During the display interval, the data driving circuit updates pixel data, and during the touch interval, the sensing circuit performs capacitive sensing. This periodic switching ensures both functions receive sufficient time resources while maintaining overall system performance.
2Measurement precision
If the touch interval is extended to improve touch sensitivity, then the signal-to-noise ratio increases, but the number of circuit components for the display must increase
Solution Approach 1:
The data driving circuit and sensing circuit are merged into a single integrated circuit device. The data driving circuit includes both the data driving function and the sensing function, allowing shared use of circuit components such as signal lines and processing units. This integration eliminates the need for separate dedicated components, reducing overall device complexity while enabling extended touch intervals for improved sensitivity.
Solution Approach 2:
The data driving circuit is designed with multi-functionality to perform both data driving and touch sensing operations. The same circuit infrastructure supports dual purposes: driving display data during the display interval and performing capacitive sensing during the touch interval. This universal design reduces the total number of components required compared to having separate dedicated circuits for each function.
3Duration of action of moving object
If simultaneous display and touch driving is implemented, then time allocation for both functions is improved, but signal interference between the two modes may occur
Solution Approach 1:
The system uses periodic time-division multiplexing to alternate between display driving and touch sensing operations. During the display interval, only data driving occurs, and during the touch interval, only sensing occurs. This periodic separation in time prevents simultaneous operation conflicts and eliminates signal interference between the two functions while ensuring both receive adequate time allocation.
Solution Approach 2:
The frame time is segmented into distinct display interval and touch interval portions, with clear boundaries between them. This segmentation allows the system to dedicate specific time periods to each function, preventing overlap and interference. The data driving circuit and sensing circuit operate in separate time segments, eliminating harmful interactions while maintaining efficient time utilization for both functions.
Data Source
AI summary
The present disclosure provides a display device for simultaneously performing display update and touch sensing in some intervals. The display device senses a touch by dividing ground voltage into two and changing one ground voltage and a data driving circuit may comprise a configuration for the signal conversion between the two ground voltages.