Touch Display Driving Module Adaptive Frequency Control
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Solution Overview
Problem
Current touch display driving methods result in high power consumption due to fixed high driving frequencies for both display and touch driving processes, which is inefficient and increases energy usage.
Innovation Solution
Implementing a dual driving mode system where the touch display driving frequency is reduced when no touch action is detected, and increased when a touch action is detected, allowing for adaptive frequency adjustment between display and touch driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed high driving frequency is used for both display and touch driving processes, then touch action detection responsiveness is improved, but power consumption of the driving module increases
Solution Approach 1:
The patent applies dynamics by making the driving frequency adjustable rather than fixed. The driving module can dynamically switch between a first driving frequency (lower) and a second driving frequency (higher) based on whether touch action is detected. This resolves the contradiction by allowing the system to use high frequency only when necessary for touch detection, while using lower frequency during normal display operation to reduce power consumption.
Solution Approach 2:
The patent changes the driving frequency parameter based on operational conditions. When touch action is detected, the system switches to a higher driving frequency to ensure responsive touch detection. When no touch action is detected, the system switches to a lower driving frequency to reduce power consumption. This parameter adjustment strategy resolves the contradiction between maintaining high responsiveness and reducing energy usage.
2Measurement precision
If progressive scanning method is used to detect touch action in H-blank stage, then touch detection capability is improved, but driving frequency increases
Solution Approach 1:
The patent implements periodic action by performing touch detection only during H-blank stages at specific intervals rather than continuously. The system uses display data of touch rows that are output during display stages and processes them during subsequent H-blank stages. This periodic approach maintains touch detection capability while avoiding the need for continuous high-frequency scanning, thereby reducing overall driving frequency.
Solution Approach 2:
The patent applies preliminary action by preparing touch row display data during display stages before the actual touch detection occurs in the H-blank stage. The driving module outputs display data of touch rows during display stages, and this pre-prepared data is then used for touch detection in the following H-blank stage. This approach allows touch detection without requiring continuous high-frequency scanning operations.
Data Source
AI summary
The present invention discloses a touch display driving method, a driving module and a display device. The method includes: detecting whether a touch action occurs; performing display driving and touch driving in a first driving mode when no touch action is detected; performing display driving and touch driving in a second driving mode when a touch action is detected, wherein a touch driving frequency under the first driving mode is smaller than a touch driving frequency under the second driving mode. In the present invention, driving is performed in the first driving mode when no touch action is detected, and driving is performed in the second driving mode when a touch action is detected. A touch driving frequency under the first driving mode is smaller than a touch driving frequency under the second driving mode, which decreases driving frequency as a whole, thereby reducing power consumption of a driving module.