Display Device Input Sensing Mode Switching and Noise Removal
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Solution Overview
Problem
Existing display devices face challenges in enhancing the sensitivity of proximity sensing during call mode and efficiently switching between direct sensing and proximity sensing modes, leading to noise interference and reduced accuracy.
Innovation Solution
A method for driving a display device that operates the input sensing part in different modes by adjusting the voltage level, number of transmission lines, and frequency of the drive signal, allowing for noise removal and improved proximity sensing sensitivity, particularly in call mode scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the input sensing part operates in proximity sensing mode during call mode, then proximity detection capability is improved, but noise interference increases and sensing accuracy deteriorates
Solution Approach 1:
The sensing operation is divided into two distinct phases: noise sensing mode and proximity sensing mode. In noise sensing mode, the system measures and stores noise values from the environment. In proximity sensing mode, the system uses these stored noise values to compensate for and remove noise from the proximity sensing signal, thereby improving sensing accuracy while operating in call mode.
Solution Approach 2:
The system performs noise sensing and stores noise values in advance before executing proximity sensing operations during call mode. This preliminary action allows the system to have noise compensation data ready, enabling effective noise removal from proximity sensing signals without interfering with the primary sensing function.
2Measurement precision
If the drive signal parameters (voltage level, number of transmission lines, frequency) are adjusted for proximity sensing, then sensing sensitivity is improved, but system complexity increases
Solution Approach 1:
The system adjusts drive signal parameters including voltage level, number of simultaneously activated transmission lines, and frequency based on the sensing mode. During noise sensing mode, different parameters are applied compared to proximity sensing mode, allowing the system to optimize sensitivity for each specific function while managing complexity through parameter variation rather than hardware changes.
3Adaptability or versatility
If the system performs both direct sensing and proximity sensing modes, then functional versatility is improved, but switching between modes becomes more difficult
Solution Approach 1:
The system dynamically switches between direct sensing mode and proximity sensing mode based on operational requirements. The sensing controller automatically adjusts the operating mode, drive signal parameters, and noise compensation strategies according to the current sensing needs, making the switching process seamless and ease of operation maintained despite the multiple functional modes available.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively increases the sensitivity of proximity sensing and facilitates seamless switching between direct sensing and proximity sensing modes, reducing noise interference and enhancing user interaction during calls.
Implementation Method 1
The input sensing part includes a plurality of first sensing electrodes connected to a plurality of transmission lines and a plurality of second sensing electrodes connected to a plurality of sensing lines
Data Source
AI summary
A method for driving a display device includes operating an input sensing part in a direct sensing mode. The input sensing part includes first sensing electrodes connected to transmission lines and second sensing electrodes connected to the sensing lines. The input sensing part operates in a noise sensing mode and proximity sensing mode when a call mode is performed. The proximity sensing mode includes generation of a proximity sensing signal concerning proximity of a user to the display device. Noise sensed in the noise sensing mode is removed from the proximity sensing signal when the proximity sensing signal indicates the user is proximate. At least one of a voltage level of a drive signal, a number of simultaneous transmission lines to which the drive signal is simultaneously applied, or a frequency of the drive signal is differently set in the noise sensing mode as compared to the proximity sensing mode.