Pixel Driving Circuit With Dual Refresh Modes for Low-Power Displays
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Solution Overview
Problem
Wearable devices face challenges in extending battery endurance time due to high power consumption, particularly in smart watches with limited battery capacity.
Innovation Solution
A pixel driving method that switches between high-frequency and low-frequency display modes, adjusting data voltage signals to maximize or minimize driving voltage based on pixel data, allowing for reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency display mode is used to maintain display quality, then display performance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic switching between high-frequency and low-frequency display modes based on real-time conditions. The system can transition from a first display mode (first frequency) to a second display mode (second frequency, lower than first frequency), enabling the display to adapt its refresh rate dynamically rather than operating at a fixed high frequency, thus reducing power consumption while maintaining display quality when needed.
Solution Approach 2:
The patent changes the display frequency parameter from a fixed high value to a variable parameter that can switch between at least two different frequencies. By adjusting the frequency parameter based on display content and user interaction states, the system optimizes the balance between display performance and power consumption, directly addressing the contradiction between high refresh rate and energy usage.
2Duration of action of moving object
If battery capacity is increased to extend endurance time, then battery life is improved, but device size increases
Solution Approach 1:
The patent implements periodic switching between high-frequency and low-frequency display modes to extend battery endurance. By alternating between a first display mode (first frequency) and a second display mode (second frequency), the system reduces average power consumption over time, thereby extending battery life without requiring an increase in battery capacity or device size.
3Reliability
If data voltage signal is continuously updated at high frequency, then display quality is maintained, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the data voltage signal update frequency based on display mode. In the first display mode, signals are updated at a first frequency, while in the second display mode, updates occur at a second frequency (lower than first frequency). This dynamic adjustment maintains display quality when necessary while reducing power consumption during low-activity periods.
Solution Approach 2:
The patent employs periodic updates of data voltage signals at different frequencies depending on the display mode. By switching between periodic updates at a first frequency and periodic updates at a second frequency, the system maintains display reliability while reducing the energy required for continuous high-frequency signal updates.
Data Source
AI summary
The disclosure provides a pixel driving method, a pixel driving circuit and a display device. The pixel driving method includes: receiving image data; determining a data voltage signal for a target pixel based on pixel data for the target pixel in the image data; in response to a first enable signal being valid, driving the target pixel in a first display mode, in which the data voltage signal is updated at a first frequency and the data voltage signal is provided for the target pixel so that a driving voltage of the target pixel is determined as a voltage difference between the data voltage signal and a common voltage signal; in response to a second enable signal being valid, driving the target pixel in a second display mode, in which the data voltage signal is updated at a second frequency, and the data voltage signal is adjusted according to the pixel data for the target pixel, so that the driving voltage of the target pixel is determined as a maximum driving voltage or a minimum driving voltage, wherein the second frequency is lower than the first frequency.