AMOLED Driving Device Frame Rate Switching Brightness
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Solution Overview
Problem
Conventional AMOLED display driving devices face challenges in maintaining consistent display brightness when switching frame rates, leading to variations in panel charging time and increased complexity in circuit design, requiring larger memory for multiple settings and affecting display characteristics like Mura.
Innovation Solution
An AMOLED display driving device that controls display driving time and emission duty ratio unchanged, using a timing control unit to adjust display and vertical blanking times, and an emission duty ratio control unit to apply emission pulses, allowing seamless switching between frame rates without altering brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different panel driving timings are used to achieve switching among different frame rates, then frame rate switching is enabled, but display brightness changes due to different panel charging time
Solution Approach 1:
The patent changes the timing parameters (display time and vertical blanking time) dynamically based on the selected frame rate, while maintaining the display time constant across all frame rates. This ensures that the panel charging time remains unchanged, thereby maintaining consistent display brightness while enabling frame rate switching.
Solution Approach 2:
The patent implements dynamic adjustment of the vertical blanking time parameter based on the selected frame rate. When switching between frame rates, the vertical blanking time is extended or reduced accordingly, while the display time remains fixed. This dynamic parameter adjustment enables frame rate switching without affecting display brightness.
2Adaptability or versatility
If a plurality of different panel drive timings are used, then frame rate switching is achieved, but memory size increases to store multiple settings
Solution Approach 1:
Instead of storing multiple complete timing settings for different frame rates, the patent only stores the variable parameter (vertical blanking time) that needs to be adjusted. The display time is kept constant and shared across all frame rates, significantly reducing the memory requirements while still enabling frame rate switching.
Solution Approach 2:
The patent extracts and separates the variable parameter (vertical blanking time) from the constant parameter (display time). Only the variable portion that changes with frame rate is stored in memory, while the constant display time is applied universally. This extraction approach minimizes memory usage.
3Adaptability or versatility
If different panel driving timings are used for frame rate switching, then frame rate switching is enabled, but circuit design complexity increases
Solution Approach 1:
The patent simplifies circuit design by implementing a parameter change approach where only the vertical blanking time is dynamically adjusted based on frame rate selection. The display time remains constant, reducing the complexity of timing control logic and circuit design compared to managing multiple complete timing sets.
Solution Approach 2:
The patent implements a dynamic timing control mechanism that automatically adjusts the vertical blanking time based on the selected frame rate. This dynamic adjustment approach simplifies the overall circuit design by using a unified timing structure with a single variable parameter, rather than managing multiple static timing configurations.
4Adaptability or versatility
If frame rate switching is implemented with different panel charging time, then frame rate switching is achieved, but display characteristics such as Mura are affected
Solution Approach 1:
The patent maintains consistent display characteristics by keeping the display time parameter constant across all frame rates. This ensures that the panel charging time remains unchanged regardless of frame rate switching, thereby preventing display artifacts such as Mura effect while still enabling frame rate switching capability.
Data Source
AI summary
An AMOLED display driving device is switchable among plural frame rates, and includes a timing control unit, a panel driving unit, and an emission duty ratio control unit. Based on an input frame rate, the timing control unit changes the display time and V-blanking time in the frame period corresponding to the frame rate by extending V-blanking time, so that the display time in the frame period corresponding to the frame rate is equal to a standard display time. Based on the input frame data and frame timing, the panel driving unit drives an AMOLED display panel to display the input frame on the AMOLED display panel according to the changed display time and V-blanking time in the frame period corresponding to the frame rate. During the frame period corresponding to the frame rate, the emission duty ratio control unit applies plural emission pulses to the AMOLED display panel.