Display Panel Data-Line Layout for Mixed-Refresh Flicker Control
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Solution Overview
Problem
Display panels experience flickering issues due to significant fluctuations in gate potentials of pixel circuits caused by high-frequency data voltage jumps on data lines, particularly in regions driven at lower refreshing frequencies.
Innovation Solution
The display panel is designed with separate data lines and control circuits for different sub-regions, allowing for distinct refreshing frequencies. The control circuit writes voltages to data lines during specific scans, minimizing coupling effects and reducing flickering by ensuring independent control of pixel circuits in each sub-region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data voltage is continuously refreshed at high frequency on data lines to ensure normal display of high-refresh sub-region, then display quality of second sub-region is improved, but coupling capacitance causes data voltage jumps that fluctuate gate potential of pixel circuits in first sub-region, resulting in flickering images
Solution Approach 1:
The display panel divides the display area into multiple sub-regions (first sub-region and second sub-region) with different refresh frequency requirements. Each sub-region can be driven independently at its optimal frequency, allowing the high-frequency sub-region to refresh at 10-60 Hz while the low-frequency sub-region refreshes at 0.1-1 Hz, thereby eliminating the flickering issue caused by uniform high-frequency driving across the entire display.
Solution Approach 2:
Different sub-regions of the display are assigned different refresh frequencies based on their specific display needs. The second sub-region displaying dynamic content receives high-frequency updates (10-60 Hz) for smooth motion, while the first sub-region displaying static content uses low-frequency updates (0.1-1 Hz) to reduce power consumption and eliminate flickering, with each region optimized for its local requirements.
2Object-affected harmful factors
If separate data lines are used for different sub-regions to enable independent frequency control, then flickering in low-frequency sub-region is reduced, but device complexity increases
Solution Approach 1:
A control circuit acts as an intermediary between the data source and the pixel circuits in different sub-regions. This control circuit selectively connects data lines to appropriate sub-regions based on their refresh requirements, managing the complexity of having separate data lines while coordinating the timing and frequency of data updates to minimize coupling capacitance effects and eliminate flickering.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces flickering in low-frequency sub-regions by minimizing the impact of high-frequency data voltage jumps on gate potentials, providing flexible frequency settings for different sub-regions without significant restrictions.
Implementation Method 1
the data voltage on the data line may jump at a high frequency due to the coupling capacitance
Data Source
AI summary
A display panel includes a first sub-region and a second sub-region, a non-display region, a first pixel circuit in the first sub-region, a second pixel circuit in the second sub-region, a first data line at least in the first sub-region, a second data line at least in the second sub-region, and a control circuit in the non-display region and connected to the first data line and the second data line. The first data line is electrically connected to the first pixel circuit. The second data line is electrically connected to the second pixel circuit. In a first mode, a data voltage refresh frequency of the first sub-region is different from that of the second sub-region, the control circuit writes a voltage to the first data line in scanning of the first sub-region and writes a voltage to the second first data line in scanning of the second sub-region.