Touch Layer Display Synchronization to Prevent Signal Interference
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Solution Overview
Problem
Electronic devices with touch functionality face interference between light-emitting units and touch units due to shared substrates, leading to unexpected issues.
Innovation Solution
The electronic device incorporates a timing control unit to provide synchronization signals, a touch control unit for touch signals, a processing unit to generate light-emitting signals based on synchronization and touch signals, and a light source driving unit to control light-emitting layers, ensuring the light-emitting units operate in different modes during different frames to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light-emitting unit and the touch unit share one substrate to reduce overall thickness, then the device becomes thinner and more compact, but signals from the light-emitting unit and the touch unit interfere with each other
Solution Approach 1:
The patent divides the light-emitting units into multiple groups and assigns different scanning timings to each group. The touch unit scanning is coordinated with these groups so that touch signal scanning occurs during periods when light-emitting units are not being scanned, thereby segmenting the scanning operations in time to avoid signal interference while maintaining the shared substrate structure
Solution Approach 2:
The patent implements periodic scanning cycles where different groups of light-emitting units are scanned alternately. By synchronizing the touch unit scanning with these periodic cycles and arranging touch scanning during intervals between light-emitting unit scanning periods, the system achieves periodic time-division multiplexing that prevents signal interference
2Use of energy by moving object
If multiple groups of light-emitting units emit light sequentially to reduce energy consumption, then energy efficiency improves, but the device requires more complex control mechanisms
Solution Approach 1:
The patent employs a single scanning control unit that performs multiple functions: it controls both the light-emitting units and the touch unit scanning operations. By making the scanning control unit universal and capable of coordinating both types of scanning with a unified timing mechanism, the patent reduces control complexity despite implementing sequential light emission and coordinated touch scanning
Solution Approach 2:
The patent pre-establishes a scanning timing schedule that divides light-emitting units into groups with predetermined scanning periods. This preliminary arrangement of scanning sequences allows the system to achieve energy efficiency through sequential emission while simplifying real-time control, as the timing coordination between light-emitting units and touch unit has been planned in advance
Data Source
AI summary
An electronic device is provided, which includes a display panel, a timing control unit, a touch layer, a touch control unit, a processing unit, a light-emitting layer, and a light source driving unit. The timing control unit is electrically connected to the display panel and provides synchronization signals. The touch layer and the light-emitting layer overlap the display panel. The touch control unit is electrically connected to the touch control layer and provides a touch signal. The processing unit is electrically connected to the timing control unit and the touch control unit and generates a light-emitting signal according to the synchronization and touch signals. The light source driving unit is electrically connected to the processing unit and controls the light-emitting layer according to the light-emitting signal to emit light in the first light-emitting mode during the first frame and in the second light-emitting mode during the second frame.