Touch Detection Method Using Dynamic Blank Periods
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Solution Overview
Problem
Current touch display devices consume excessive power as they detect both active and passive touch operations in every working cycle, even when no active touch object is present, leading to inefficient power management.
Innovation Solution
Implementing a touch detection method that utilizes a first-type blank period for detecting a first touch object, a second-type blank period for judging the presence of a second touch object, and a third-type blank period for detecting either touch object based on the judgment, allowing for optimized power usage by adjusting detection frequency according to actual conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device detects both active and passive touch operations in every working cycle, then touch detection completeness is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic touch detection by adjusting detection frequency based on detected touch states. When a passive touch is detected in the second-type blank period, the system activates full touch detection in subsequent third-type blank periods. When no passive touch is detected, the system skips full detection cycles, dynamically adapting detection intensity to actual needs and reducing power consumption while maintaining detection completeness.
Solution Approach 2:
The patent structures touch detection around periodic blank periods (first-type, second-type, and third-type blank periods) within display frames. By organizing detection operations in these periodic intervals and conditionally activating full detection only when necessary (when passive touch is detected), the system maintains reliable detection coverage while significantly reducing average power consumption compared to continuous full detection.
2Measurement precision
If the device performs full touch detection in every blank period, then touch detection accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by implementing a two-stage detection process. The first-stage passive touch detection in second-type blank periods uses minimal processing. The second-stage full touch detection in third-type blank periods is performed only when necessary (when passive touch is detected). This partial execution of full detection reduces processing time while maintaining accuracy for cases that require it.
Solution Approach 2:
The patent segments touch detection into multiple independent stages: passive touch detection in second-type blank periods, and conditional full touch detection in third-type blank periods. This segmentation allows the system to perform only the necessary detection operations, reducing overall processing time while maintaining detection accuracy for actual touch events through the conditional second-stage detection.
3Use of energy by moving object
If the device reduces touch detection frequency to save power, then power consumption decreases, but touch detection responsiveness deteriorates
Solution Approach 1:
The patent implements dynamic responsiveness by conditionally activating full touch detection in third-type blank periods when passive touch is detected in second-type blank periods. This dynamic adjustment ensures high detection responsiveness (full detection) when touches occur while maintaining low power consumption (reduced detection) during idle periods, optimizing the responsiveness-power tradeoff in real-time.
Solution Approach 2:
The patent uses feedback from the passive touch detection stage to control the activation of full touch detection. The result of judging whether a second touch object is detected in the second-type blank period feeds into the decision to perform full touch detection in third-type blank periods. This feedback mechanism ensures detection responsiveness is maintained when needed while saving power during idle periods.
Data Source
AI summary
A touch control method applied in a touch device, the touch display working during a plurality of display frames, a first-type blank period being between each two adjacent display frames, and each of the plurality of display frames comprising at least one second-type blank period and at least one third-type blank period; the touch detection method comprising: detecting a touch operation of a first touch object in at least one of the first-type blank period; judging whether a second touch object being detected in the at least one second-type blank period; and according to a result of the judging, detecting the touch operation of the first touch object or/and the second touch object in at least parts of the at least one third-type blank period. A driver and a touch display device is also provided.