Touch Panel Built-in Display Device Segmenting Frame Periods
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Solution Overview
Problem
Existing touch panel built-in display devices face challenges in achieving high definition and high-speed driving while minimizing the impact of touch detection on display and display effects on touch detection, due to the alternating nature of display and touch sensing modes in one frame period.
Innovation Solution
The implementation of a touch panel built-in display device with a configuration that includes multiple pixel electrode groups, display driving control units, touch sensor electrodes overlapping with pixel electrode groups, and a touch detection driving control unit that supplies touch detection signals only to non-active pixel electrode groups during display signal supply, allowing for simultaneous high-speed and high-definition operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If alternating execution of display mode and touch sensing mode is implemented in one frame period, then interference between display and touch detection is suppressed, but the period of each mode becomes shorter
Solution Approach 1:
The patent segments the frame period into multiple sub-periods, where during each sub-period, display driving signals are supplied to specific pixel electrode groups while touch detection driving signals are supplied to other pixel electrode groups that are not currently being driven by display signals. This segmentation allows both display and touch detection to operate simultaneously without mutual interference, while maintaining adequate time for each operation.
2Measurement precision
If the number of pixel arrays is increased to raise display definition, then display definition is improved, but the period of display mode becomes even shorter
Solution Approach 1:
The patent divides the pixel arrays into multiple groups and segments the frame period accordingly. During each sub-period, display driving signals are supplied to one group while touch detection driving signals are supplied to another group. This allows the system to drive a larger number of pixel arrays (increasing display definition) while maintaining sufficient time for each operation by utilizing parallel processing across different pixel groups.
3Speed
If frame period is shortened to increase driving speed, then driving speed is improved, but the period of display mode becomes even shorter
Solution Approach 1:
The patent segments the frame period into multiple sub-periods and distributes display and touch detection operations across these segments. By doing so, the system can shorten the overall frame period to increase driving speed while ensuring that each sub-period has sufficient duration for both display and touch detection operations to complete without interference.
Solution Approach 2:
The patent implements periodic action by alternating between display driving and touch detection driving in a rhythmic pattern within each frame period. This periodic execution allows the system to maintain high driving speed through frequent frame updates while ensuring adequate time for each operation through the structured periodic nature of the signal supply.
Data Source
AI summary
A display device includes pixel electrode groups and a touch detection driver. During a period, the touch detection driver does not supply touch detection driving signals to a transmitter electrode overlapping in plan view a pixel electrode group to which gate signals are being supplied, and supply touch detection driving signals to a transmitter electrode disposed so as to overlap in plan view a pixel electrode group to which gate signals are not being supplied.