Sensor Driver Proximity Sensing Mode Control
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Solution Overview
Problem
Existing electronic devices with proximity sensing functions face challenges in efficiently managing power consumption and improving sensing sensitivity during proximity sensing modes, particularly when displaying still images or videos, as they often require frequent data transmission and high frame rates.
Innovation Solution
The electronic device incorporates a sensor layer with a proximity sensing function, featuring a display layer with variable frame frequencies and operating modes, where the sensor driver adjusts its operation based on reference proximity signals to optimize power usage and sensitivity by switching between touch sensing and proximity sensing periods, especially during blank periods when data is not received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display layer operates at high frame frequency to display video, then video display quality is improved, but power consumption increases
Solution Approach 1:
The display layer dynamically adjusts its frame frequency based on the type of content being displayed. When displaying still images, it operates at a lower first frame frequency (20 Hz), and when displaying videos, it switches to a higher second frame frequency (30 Hz). This dynamic adjustment optimizes power consumption while maintaining appropriate display quality for different content types.
Solution Approach 2:
The system changes the operating parameter (frame frequency) of the display layer according to the display content. By switching between 20 Hz for still images and 30 Hz for videos, the system adapts the refresh rate to match the requirements of different content types, reducing unnecessary power consumption during still image display while ensuring smooth video playback when needed.
2Reliability
If the sensor driver operates continuously in first mode to maintain touch sensing capability, then touch sensing reliability is improved, but power consumption increases during proximity sensing mode
Solution Approach 1:
The sensor driver employs periodic switching between first mode and second mode during proximity sensing operation. It alternates between maintaining full touch sensing capability (first mode) and operating in a lower-power state (second mode) with extended proximity sensing periods. This periodic action reduces average power consumption while still providing proximity sensing functionality throughout the cycle.
Solution Approach 2:
The sensor driver dynamically switches between two operational modes based on the current sensing requirements. During proximity sensing mode, it transitions from continuous first mode operation to a dynamic switching pattern between first and second modes, adapting its operational state to match the specific needs of proximity detection while conserving power during intervals when full touch sensing is not required.
3Measurement precision
If the sensor driver extends proximity sensing period to overlap blank periods, then sensing sensitivity is improved, but device complexity increases
Solution Approach 1:
The sensor driver merges the proximity sensing operation with the display layer's blank periods by extending the proximity sensing period to overlap with these intervals. This combining of sensing operations with existing display timing structures allows the system to perform proximity detection during otherwise idle periods, improving sensing sensitivity without requiring additional dedicated sensing time or complex separate control mechanisms.
Solution Approach 2:
The sensor driver is designed to perform multiple functions by extending its operational periods to serve both touch sensing and proximity sensing requirements. The same sensor driver circuitry and control logic handle both sensing modes, with the extended proximity sensing period overlapping blank periods to maximize resource utilization. This multi-functional approach improves sensing capability while avoiding the need for separate dedicated proximity sensing hardware or control systems.
Data Source
AI summary
Disclosed is an electronic device which include a display layer that includes a plurality of pixels, a sensor layer disposed on the display layer and includes a plurality of first electrodes and a plurality of second electrodes, a display driver that drives the display layer, and a sensor driver that drives the sensor layer and selectively operates, in a proximity sensing mode, in a first mode or a second mode different from the first mode. When the electronic device enters the proximity sensing mode, the display layer operates in an active period during which data are received from the display driver and a blank period during which the data are not received. The sensor driver operates in the second mode in a period overlapping the blank period.