Display Panel Power Savings During Stylus Usage
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Solution Overview
Problem
Electronic devices with touch screens experience increased power consumption and heat generation during stylus usage due to higher refresh rates, and areas of the display screen are covered by users' hands or arms, leading to reduced visibility and inefficient power usage.
Innovation Solution
Implementing touch event location data and image data analysis to determine the shape of users' hands or arms covering the screen, allowing for selective control of pixels to turn off or dim areas not visible to the user, while also adjusting parameters like charging rate and CPU performance to reduce heat and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display panel operates at a higher refresh rate during stylus usage, then the smoothness of stylus input is improved, but power consumption increases
Solution Approach 1:
The display panel is divided into active regions and inactive regions. Only the active region corresponding to the visible display area is updated at the higher refresh rate, while the inactive region (covered by user's hand) operates at a lower refresh rate or is turned off, thereby reducing overall power consumption while maintaining smooth stylus input visibility
Solution Approach 2:
Different refresh rates are applied to different regions of the display panel. The region visible to the user maintains high refresh rate for smooth stylus input, while the covered region uses lower refresh rate or is disabled, optimizing power efficiency without compromising user experience
2Speed
If the display panel operates at a higher refresh rate during stylus usage, then the smoothness of stylus input is improved, but heat generation increases
Solution Approach 1:
The display panel is segmented into active and inactive regions with different operational states. The inactive region covered by the user's hand is either turned off or operated at a reduced refresh rate, significantly reducing heat generation in that area while maintaining smooth stylus input in the visible region
Solution Approach 2:
Different thermal management strategies are applied to different regions. The visible region maintains high refresh rate with associated heat, while the covered region uses lower refresh rate or is disabled, reducing overall heat generation and improving thermal comfort during stylus usage
3Use of energy by moving object
If pixels in covered areas are turned off or dimmed to save power, then power consumption is reduced, but visibility in those areas is reduced
Solution Approach 1:
The display is segmented into visible and covered regions. Pixels in the covered region (occluded by user's hand) are turned off or dimmed to save power, while pixels in the visible region maintain full brightness and refresh rate, ensuring no loss of visibility where content is actually viewed
Solution Approach 2:
Different illumination states are applied locally: the covered region uses reduced or zero illumination to conserve power, while the visible region maintains full illumination for optimal visibility. This ensures power savings are achieved without compromising the user's viewing experience
Data Source
AI summary
Apparatus, systems, and methods for display panel power savings during stylus usage are disclosed. An example apparatus includes interface circuitry to receive touch event location data indicative of touch events by a user on a display screen of an electronic device; and processor circuitry to perform operations to instantiate display mapping circuitry to identify an area of the display screen covered by a portion of a body of the user based on a shape of the portion; and pixel identification circuitry to identify respective ones of pixels of the display screen in the area of the display screen; and cause a property of the respective ones of the pixels to be adjusted.