OLED Drive Circuit Adjusts Refresh Rate for Ghosting
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Solution Overview
Problem
Image ghosting occurs during frame transitions in OLED displays, and existing solutions that increase screen refresh rate to mitigate this issue lead to increased power consumption and reduced service life.
Innovation Solution
A drive circuit that adjusts the screen refresh rate by determining whether frames are dynamic or static, generating a clock signal at either a first frequency (e.g., 60 Hz) for dynamic frames or a higher frequency (e.g., 120 Hz) for static frames, thereby reducing power consumption and prolonging service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screen refresh rate is increased to eliminate image ghosting, then the image quality during frame transition is improved, but the power consumption increases and service life is reduced
Solution Approach 1:
The patent applies dynamics by making the screen refresh rate adjustable rather than fixed. The system dynamically switches between normal refresh rate (e.g., 60Hz) for dynamic frames and doubled refresh rate (e.g., 120Hz) for static frames, optimizing the balance between image quality and power consumption based on real-time frame analysis
Solution Approach 2:
The patent changes the parameter of screen refresh rate based on frame characteristics. By detecting whether a frame is dynamic or static, the system adjusts the refresh rate parameter accordingly - using higher refresh rate only when necessary to eliminate ghosting, thereby reducing overall power consumption
2Reliability
If the screen refresh rate is increased to eliminate image ghosting, then the image quality during frame transition is improved, but the service life is reduced
Solution Approach 1:
The system dynamically adjusts the refresh rate based on frame type, avoiding continuous operation at high refresh rate. This extends the service life by reducing cumulative stress on the display hardware while maintaining image quality when needed
Solution Approach 2:
By changing the refresh rate parameter based on actual display needs, the system reduces unnecessary wear and tear on the display components, thereby prolonging service life while maintaining image quality during critical moments
3Reliability
If a fixed high screen refresh rate is used to prevent image ghosting, then the image quality is consistently improved, but the power consumption increases continuously
Solution Approach 1:
The patent applies partial action by using doubled refresh rate only partially - specifically only for static frames where ghosting occurs - rather than continuously. This selective approach eliminates ghosting where needed while avoiding unnecessary power consumption during dynamic content display
Data Source
AI summary
A display apparatus and a drive circuit for adjusting a screen refresh rate of the display apparatus and a method thereof are disclosed. The display apparatus comprises an OLED diode display array and a drive circuit. The drive circuit comprises a detection unit, a clock generating unit, and a timing control unit. The detection unit determines whether a plurality of frames displayed by the OLED diode display array are configured as a dynamic frame. The detection unit generates a first control signal when the displayed frames are not configured as a dynamic frame, and the detection unit generates a second control signal when the displayed frames are configured as a dynamic frame. The clock generating unit generates a clock signal, the frequency of which is a first frequency in response to the first signal, or a second frequency in response to the second signal. The first frequency is greater than the second frequency. The timing control unit sets the screen refresh rate of the display apparatus in response to the frequency of the clock signal.