Display Device Input Sensing Unit Proximity Detection
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Solution Overview
Problem
Display devices continue to consume power even when the image is not viewable by the user, leading to increased power consumption and reduced usefulness.
Innovation Solution
A display device with an input sensing unit that includes intersecting first and second electrodes, capable of determining object proximity and shape using self-capacitance and mutual-capacitance methods, which switches to a power-saving mode when an object, such as a user's face, is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device continues to display an image even when not viewable by a user, then the display function is maintained, but power consumption increases
Solution Approach 1:
The display device performs preliminary detection of user presence before displaying content. The sensing unit detects whether a user is present in the viewing area before the display unit activates to show an image, ensuring the display function is only activated when needed, thus avoiding unnecessary power consumption while maintaining display reliability when a user is actually present
2Use of energy by moving object
If the display device stops displaying to reduce power consumption, then energy efficiency improves, but the ability to maintain continuous display function deteriorates
Solution Approach 1:
The display device dynamically adjusts its operation state based on real-time user presence detection. The control unit continuously monitors sensing data and switches between active display mode and power-saving mode accordingly, allowing the display function to be maintained when users are present while reducing power consumption when no users are detected, thus resolving the contradiction between continuous display availability and energy efficiency
3Use of energy by moving object
If an input sensing unit is added to detect user presence, then power consumption can be reduced through intelligent control, but device complexity increases
Solution Approach 1:
The display device integrates a sensing unit that serves multiple functions: detecting user presence for power management, determining user position for display content control, and potentially serving as part of the display structure itself. This multi-functionality allows the additional sensing components to justify their presence by providing comprehensive control capabilities that reduce power consumption across multiple operational aspects
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
Reduces power consumption and improves call quality by stopping image display and allocating system resources to call functions when a user's face is detected, enhancing the device's operational efficiency.
Implementation Method 1
a control unit configured to determine a proximity of an object or a shape of the object, based on capacitance change values of the first electrodes and the second electrodes
Data Source
AI summary
A display device is described including a display panel for displaying an image and an input sensing unit disposed on the display panel for sensing a user input. The input sensing unit includes: an electrode unit including first electrodes and second electrodes which intersect each other and a control unit for determining the proximity of an object or the shape of the object, based on capacitance change values of the first electrodes and the second electrodes. In a first mode the input sensing unit is driven using a self-capacitance method. The control unit may merge the capacitance change values, and determine the proximity of the object based on the merged value. In a second mode based on mutual capacitance, the control unit may determine the shape of the object.