Display Panel Driver Variable Frame Rate Luminance Control
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Solution Overview
Problem
Display devices often experience a mismatch in frame rates between the host processor and the display device, leading to a tearing phenomenon and inconsistent image quality, especially when rendering complex game images.
Innovation Solution
A display device with a panel driver that monitors the variable input frame frequency, determines a reference frequency within a predetermined range, and adjusts data voltages to maintain a consistent luminance, thereby minimizing flicker and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the display device operates at a constant frame rate (e.g., 60 Hz), then the display stability is improved, but the adaptability to variable frame rates from the host processor deteriorates, causing frame rate mismatch and tearing phenomenon
Solution Approach 1:
The display device dynamically adjusts its operating frame rate to match the variable frame rate of the host processor. The panel driver monitors the input frame frequency and adjusts the display panel's refresh rate accordingly, allowing the system to transition from a static constant frame rate to a dynamic variable frame rate operation, thereby preventing frame rate mismatch and tearing while maintaining display stability
Solution Approach 2:
The invention changes the frame rate parameter of the display device to match the host processor's output frame rate. By monitoring the input frame frequency and adjusting the display panel's operating parameters (such as refresh rate and luminance compensation), the system adapts to variable frame rates without causing tearing or instability
2Adaptability or versatility
If the display device adjusts to variable frame rates, then the frame rate mismatch is reduced, but the luminance consistency deteriorates, causing flicker in the displayed image
Solution Approach 1:
The panel driver implements a feedback mechanism by monitoring the input frame frequency and using this information to adjust the luminance compensation. The system continuously detects the current frame rate and modifies the data voltages applied to the display panel accordingly, creating a closed-loop control system that maintains luminance consistency across variable frame rates and eliminates flicker
Solution Approach 2:
The invention applies preliminary compensation to counteract the expected luminance variations that occur during frame rate transitions. By pre-calculating and applying appropriate luminance compensation based on the monitored frame frequency, the system prevents flicker before it occurs, maintaining stable display output throughout frame rate changes
3Manufacturing precision
If the panel driver monitors and adjusts data voltages for each variable frame frequency, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The panel driver is designed to perform multiple functions: it monitors the input frame frequency, determines the appropriate luminance compensation, and adjusts the data voltages accordingly. By consolidating these functions into a single multi-functional component, the invention achieves high image quality across variable frame rates without proportionally increasing overall device complexity
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, and a panel driver configured to drive the display panel. The panel driver receives input image data at a variable input frame frequency, stores the variable input frame frequency as a previous frame frequency by monitoring the variable input frame frequency, determines a reference frequency based on the previous frame frequency, determines a reference luminance as a luminance of the display panel at the reference frequency, and adjusts data voltages applied to the plurality of pixels such that a luminance of the display panel at the variable input frame frequency becomes the reference luminance.