PSR Controller Frequency Adjustment for Display Brightness Stability
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Solution Overview
Problem
Conventional Panel Self-Refresh (PSR) technology in display devices experiences perceivable changes in brightness due to increased data voltage charging time when switching from 60 Hz to 48 Hz, leading to suboptimal display performance and power consumption.
Innovation Solution
A display device and method that incorporates a PSR controller to change the operating frequency of the gate driver and data driver to a higher frequency than the reference frequency set by the system board section, and temporarily stops the data driver during a blank period, thereby reducing power consumption and minimizing brightness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the operating frequency is reduced to 48 Hz for power saving, then power consumption is reduced, but brightness stability deteriorates due to increased data voltage charging time
Solution Approach 1:
The patent dynamically adjusts the operating frequency based on the type of image being displayed. For static images, the frequency is reduced to 48 Hz for power saving, while for moving images, the frequency is maintained at 60 Hz to ensure brightness stability. This dynamic frequency adjustment resolves the contradiction by adapting the operating parameters to the specific display requirements.
Solution Approach 2:
The patent changes the operating frequency parameter from a fixed value to a variable that can be adjusted between 48 Hz and 60 Hz based on display content. This parameter change allows the system to optimize power consumption for static images while maintaining brightness stability for moving images, thereby resolving the technical contradiction.
2Use of energy by moving object
If the operating frequency is changed from 60 Hz to 48 Hz, then power consumption is reduced, but display quality deteriorates due to perceivable brightness changes
Solution Approach 1:
The system dynamically switches between 48 Hz and 60 Hz operating frequencies based on whether the displayed content is static or moving. This dynamic adaptation ensures that display quality is maintained for moving images while power consumption is reduced for static images, resolving the contradiction between power saving and display quality.
Solution Approach 2:
The system uses feedback about the type of image content (static or moving) to automatically adjust the operating frequency. This feedback mechanism ensures that the frequency is optimized based on actual display requirements, maintaining display quality while achieving power savings when appropriate.
3Illumination intensity
If the frequency is increased above the reference frequency, then brightness stability is improved, but power consumption increases
Solution Approach 1:
The patent changes the operating frequency parameter dynamically based on display content requirements. By adjusting the frequency between 48 Hz and 60 Hz according to whether the content is static or moving, the system achieves brightness stability only when necessary, thereby resolving the contradiction between brightness stability and power consumption.
Solution Approach 2:
The system employs periodic action by switching between different frequency modes (48 Hz for static, 60 Hz for moving) based on the temporal characteristics of the display content. This periodic adjustment of operating parameters ensures that higher frequency (and thus better brightness stability) is used only when necessary, optimizing the trade-off between display quality and power consumption.
Data Source
AI summary
A display device and method of driving the same are disclosed. The display device that transmits signals between a system board section and a circuit board section through an interface and uses Panel Self-Refresh (hereinafter, abbreviated as ‘PSR’) to reduce power consumption, the circuit board section comprising a PSR controller that, when a PSR On signal is supplied from the system board section, changes the operating frequency of a gate driver and data driver to a frequency higher than a reference frequency for driving the panel with PSR On, set by the system board section.