Display Refresh Frequency Control for Low-Power Oxide Panels
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Solution Overview
Problem
Electronic devices with oxide semiconductor-based displays face challenges in reducing refresh frequency, leading to increased current consumption, potential color and brightness differences, and abnormal phenomena like ghost touch due to interference with device components.
Innovation Solution
An electronic device with a processor that adjusts refresh frequencies based on event information, such as illuminance, touch operations, wireless charging, and AOD mode, by setting target and intermediate frequencies to minimize current consumption and prevent visual differences and abnormal phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh frequency of the display is reduced to lower current consumption, then power efficiency improves, but color difference and brightness difference become visually perceptible
Solution Approach 1:
The patent implements dynamic refresh frequency adjustment where the display switches between first refresh frequency (for normal operation) and second refresh frequency (lower, for power saving). The system dynamically selects operating modes based on event information such as touch operations, wireless charging status, and AOD mode, allowing optimal balance between power consumption and display quality at different times.
Solution Approach 2:
The patent changes the refresh frequency parameter from a fixed value to a variable that can take different values (first refresh frequency and second refresh frequency). By adjusting this parameter based on operational conditions and event information, the system optimizes the trade-off between current consumption and display quality without permanent degradation.
2Use of energy by moving object
If the refresh frequency is reduced to save power, then energy efficiency improves, but abnormal phenomena such as ghost touch occur due to interference with device components
Solution Approach 1:
The system dynamically adjusts refresh frequency based on event information including touch operation detection. When touch operations are detected, the system switches to the first refresh frequency to prevent ghost touch phenomena, while maintaining power-saving mode with the second refresh frequency during non-touch periods.
Solution Approach 2:
The patent implements feedback mechanisms where event information (such as touch operation status, wireless charging state, and AOD mode) is continuously monitored. Based on this feedback, the system automatically adjusts the refresh frequency to prevent abnormal phenomena like ghost touch while optimizing power consumption.
3Use of energy by moving object
If the refresh frequency is dynamically adjusted based on event information, then power consumption is optimized, but device complexity increases due to additional control logic
Solution Approach 1:
The patent makes the display system multi-functional by enabling it to operate in different refresh frequency modes (normal mode with first frequency and power-saving mode with second frequency) based on event information. This universal approach allows a single display system to handle multiple operational requirements without requiring separate hardware systems.
Solution Approach 2:
The system manages complexity by primarily changing the refresh frequency parameter rather than introducing complex hardware modifications. The control logic adjusts this single critical parameter based on event information, providing power optimization with relatively simple implementation compared to more complex control systems.
Data Source
AI summary
An electronic device includes a display including a plurality of pixels; a display driver configured to provide a data voltage to the plurality of pixels of the display; and a processor configured to: obtain frequency change-based event information, determine a first frequency and a second frequency higher than the first frequency based on the frequency change-based event information, the first frequency being a target value of a refresh frequency, and provide frame data to the display driver, wherein the processor is further configured to control the display driver to: set a frame section in which the display is driven, during a first frame, generate the data voltage based on the frame data and provide the data voltage to the plurality of pixels, and during a low-frequency driving section, in which the frame data is not obtained, after the first frame, refresh an image based on the second frequency and refresh the image based on the first frequency.