Display Duty Cycle Control for Luminance Uniformity
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Solution Overview
Problem
Display devices experience luminance deviations and flickering when the driving frequency changes, particularly when a display panel is divided into multiple areas and a frame memory is used for simultaneous scanning, leading to uneven light emission and power consumption issues.
Innovation Solution
A display device with a duty cycle controller that recalculates and adjusts the duty cycle based on known and unknown areas within a frame, using a resolution information detector and signal generator to generate control signals for varying the duty cycle of known areas and maintaining a fixed duty cycle for unknown areas, thereby controlling light emission and non-emission times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving frequency of the display panel is changed, then the refresh rate is improved, but luminance uniformity deteriorates due to luminance deviations and flickering
Solution Approach 1:
The patent dynamically adjusts the duty cycle of the display panel based on the detected driving frequency. When the driving frequency changes, the controller recalculates and varies the duty cycle to compensate for luminance deviations, thereby maintaining luminance uniformity while operating at different refresh rates
Solution Approach 2:
The patent changes the duty cycle parameter in response to driving frequency changes. By detecting the driving frequency and adjusting the duty cycle accordingly, the system maintains optimal luminance uniformity across different operating conditions without sacrificing refresh rate performance
2Productivity
If a frame memory is used to simultaneously scan multiple display areas, then scanning efficiency is improved, but luminance deviations between frames occur
Solution Approach 1:
The patent applies different duty cycles to different display areas based on their specific requirements. By dividing the display panel into multiple areas and assigning optimized duty cycles to each, the system maintains luminance consistency while achieving efficient simultaneous scanning through the frame memory structure
Solution Approach 2:
The patent uses a duty cycle controller that detects driving frequency and frame information, then provides feedback adjustment to optimize the duty cycle for each display area. This feedback mechanism ensures luminance consistency between frames while maintaining high scanning efficiency
3Ease of operation
If the duty cycle is fixed, then control simplicity is maintained, but luminance uniformity deteriorates when driving frequency changes
Solution Approach 1:
The patent transitions from a fixed duty cycle to a dynamic duty cycle system that automatically adjusts based on detected driving frequency. The controller monitors frequency changes and varies the duty cycle accordingly, maintaining luminance uniformity without requiring manual intervention, thus preserving ease of operation while improving performance
Data Source
AI summary
The present disclosure discloses a display device and a driving method of the display device. The display device includes a display panel for displaying an image, a driver for driving the display panel, a controller for controlling the driver, and a duty cycle controller for defining an unknown area in which vertical resolution information is not known and a known area in which the vertical resolution information is known within one frame when a driving frequency of the display panel is changed, and varying a duty cycle for driving the known area.