LED Display Controller with Dynamic Refresh Rate and Voltage Resetting
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Solution Overview
Problem
LED displays face challenges in reducing power consumption while minimizing visual artifacts such as flicker, especially when operating at reduced refresh rates.
Innovation Solution
The use of low leakage switch transistors like Oxide TFTs and a combined LTPO structure, along with continuous voltage resetting at the anode of the LED at a higher frequency than the data refresh rate, helps reduce visual artifacts and achieve power conservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh rate of the LED display is reduced to save power, then power consumption is reduced, but visual artifacts such as flicker increase
Solution Approach 1:
The patent applies periodic action by implementing a dual-mode refresh system where the display alternates between high refresh rate periods (to prevent flicker) and low refresh rate periods (to save power). The controller selectively switches between 60Hz and lower refresh rates based on content requirements, allowing the display to maintain visual quality when needed while consuming less power during static or less sensitive content display.
Solution Approach 2:
The patent implements dynamics by making the refresh rate adjustable and content-dependent rather than fixed. The system dynamically adapts the refresh rate based on the displayed content characteristics, user settings, and power state, enabling optimal balance between power consumption and visual quality. This dynamic adjustment allows the display to transition smoothly between different operational modes.
2Duration of action of moving object
If the refresh rate is reduced to extend battery life, then power consumption decreases, but display performance and visual quality deteriorate
Solution Approach 1:
The patent implements dynamics by making the refresh rate adjustable and content-dependent rather than fixed. The system dynamically adapts the refresh rate based on the displayed content characteristics, user settings, and power state, enabling optimal balance between power consumption and visual quality. This dynamic adjustment allows the display to transition smoothly between different operational modes.
Solution Approach 2:
The patent applies parameter changes by modifying the refresh rate parameter based on content requirements and power state. The controller adjusts this critical display parameter to optimize the balance between battery life extension and visual quality maintenance, allowing the system to operate at lower refresh rates for static content while switching to higher rates for dynamic content that requires smooth display performance.
3Object-generated harmful factors
If continuous voltage resetting is implemented at higher frequency, then visual artifacts are reduced, but power consumption increases
Solution Approach 1:
The patent applies periodic action by implementing a dual-mode refresh system where the display alternates between high refresh rate periods (to prevent flicker) and low refresh rate periods (to save power). The controller selectively switches between 60Hz and lower refresh rates based on content requirements, allowing the display to maintain visual quality when needed while consuming less power during static or less sensitive content display.
Data Source
AI summary
An electronic device comprises a display and a controller. The controller is configured to provide a first frequency refresh rate to the display. The controller is also configured to generate a control signal configured to control emission of a light emitting diode of a display pixel of the display at a second frequency based on whether the first frequency refresh rate of the display is less than a predetermined threshold value.