Display Sensor Offset Data Management for Proximity and Touch
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Solution Overview
Problem
Current display devices face challenges in precisely detecting inputs such as proximity or non-proximity and touch events due to limitations in sensing signal processing and offset data management, leading to potential sensing errors.
Innovation Solution
A display device with a processor connected to a sensor that adjusts sensing rules based on events like object proximity or touch, including changing offset data update rules, reducing sensing signal ratios, and limiting sensor areas for updates, to accurately detect inputs and prevent errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the processor continuously updates offset data using sensing signals in the second mode (proximity sensing mode), then the sensing accuracy may be maintained, but sensing errors occur due to inappropriate offset data updates during proximity events
Solution Approach 1:
The processor dynamically changes the offset data update rule based on the operating mode. In the first mode (touch sensing mode), the processor updates offset data continuously using sensing signals. In the second mode (proximity sensing mode), the processor suspends or reduces offset data updates to prevent sensing errors during proximity events. This dynamic adaptation resolves the contradiction by adjusting the update behavior according to the current sensing context.
Solution Approach 2:
The processor changes the parameter of offset data update frequency based on the operating mode. In the first mode, the update frequency is high (continuous updates). In the second mode, the update frequency is reduced or suspended. This parameter change allows the system to maintain sensing accuracy when needed while preventing sensing errors during proximity events.
2Measurement precision
If the processor applies sensing signals to all sensor areas for offset data updates, then comprehensive sensing coverage is achieved, but processing time and complexity increase
Solution Approach 1:
The processor applies offset data updates selectively to specific sensor areas rather than uniformly across all sensor areas. In the second mode, the processor may suspend updates for certain areas or apply updates with different frequencies based on local sensing requirements. This local differentiation reduces processing time while maintaining necessary sensing coverage in critical areas.
3Device complexity
If the processor uses the same driving signal characteristics for both first mode (touch sensing) and second mode (proximity sensing), then system complexity is reduced, but sensing performance deteriorates
Solution Approach 1:
The processor changes the parameters of the driving signal based on the operating mode. In the first mode (touch sensing mode), the processor uses driving signal characteristics optimized for touch detection. In the second mode (proximity sensing mode), the processor uses different driving signal characteristics optimized for proximity detection. This parameter differentiation improves sensing performance for each specific function while maintaining manageable system complexity through mode-based control.
Data Source
AI summary
A display device including: a display panel configured to display an image; a sensor overlapping the display panel; and a processor connected to the sensor, and configured to sense input from an object, in response to a sensing signal provided from the sensor, wherein the processor obtains, in response to the sensing signal, offset data that corresponds to a case where there is no input, and senses the input by reflecting the offset data to the sensing signal, wherein the processor senses touch input from the object in a first mode, and senses proximity of the object in a second mode, and wherein the processor changes a rule related to obtaining the offset data in response to an event occurring in the second mode.