Virtual Keyboard Resizing on Display Panels to Reduce Afterimages
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Solution Overview
Problem
Foldable display devices experience afterimages due to long-term display of still images like virtual keyboards, which can cause asymmetrical or distorted display and reduced usability.
Innovation Solution
A display device with a controller that adjusts the size of virtual keyboards or keys by shifting their center within a selected range at a specific interval, maintaining aspect ratios and mixing data signals over multiple frames to prevent afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a virtual keyboard is displayed as a still image for a long period of time, then the keyboard functionality is maintained, but an afterimage occurs on the display panel
Solution Approach 1:
The patent applies dynamics by periodically changing the size of the virtual keyboard between a first size and a second size during display. This dynamic size adjustment prevents afterimages by avoiding static display conditions, while maintaining the keyboard's functionality and user interaction capability throughout the process.
Solution Approach 2:
The patent implements periodic action by alternately adjusting the virtual keyboard size between two states at predetermined intervals. This periodic size change creates a cycling pattern that prevents afterimage formation while ensuring the keyboard remains functional during both size states, resolving the contradiction between maintaining functionality and preventing visual artifacts.
2Object-generated harmful factors
If the virtual keyboard size is adjusted to prevent afterimages, then afterimage is reduced, but display uniformity and key proportion may be compromised
Solution Approach 1:
The patent applies parameter changes by adjusting the size parameter of the virtual keyboard between two specific values (first size and second size) while maintaining other display parameters constant. This controlled parameter adjustment prevents afterimages while preserving key proportions and display uniformity, as the size changes are predetermined and managed to avoid distortion.
Solution Approach 2:
The patent implements feedback by monitoring the display state and periodically adjusting the keyboard size based on predetermined criteria. This feedback mechanism ensures that size adjustments are made only when necessary to prevent afterimages, while maintaining key proportions and display uniformity through controlled, incremental changes rather than arbitrary resizing.
3Object-generated harmful factors
If pixel shifting is used to prevent afterimages, then afterimage is reduced, but asymmetrical or distorted display may occur
Solution Approach 1:
The patent applies asymmetry in a controlled manner by alternating between two different keyboard sizes rather than maintaining a single static size. This controlled asymmetry prevents afterimages through size variation while maintaining overall display symmetry and composition stability, as the adjustments are periodic and reversible rather than permanent or random.
Data Source
AI summary
A display device includes: a display panel including a first display area configured to display a virtual keyboard including a plurality of virtual keys and a second display area adjacent to the first display area; a data driver configured to provide a data voltage to the display panel; and a controller configured to provide a data signal to the data driver, wherein the controller configured to generate the data signal to reduce or enlarge the virtual keyboard with respect to a center of the virtual keyboard within a selected range at a selected time interval.