Display Pixel Driving Voltage Adjustment for Refresh Rate Consistency
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Solution Overview
Problem
Electronic displays with self-emissive pixels face performance inconsistencies due to varying refresh rates, leading to diverging brightness and color performance, which negatively impact user experience, especially when refresh rates are not divisors of the pixel emission frequency.
Innovation Solution
The use of multiple optical calibration lookup tables (LUTs) for different gamma bands and adjusting driving voltages to match charging speeds of display pixels across varying refresh rates, allowing for consistent brightness and color performance by sharing or using separate LUTs based on global display brightness and gray levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If refresh rate is adjusted to non-divisor values (e.g., 50 Hz, 59.94 Hz), then user experience and adaptability are improved, but brightness and color performance consistency deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting driving voltages and time constants based on the selected refresh rate. When a non-divisor refresh rate is detected, the system modifies the voltage applied to display pixels and adjusts the time constant to compensate for the timing mismatch, thereby maintaining consistent brightness and color performance across different refresh rates including 50 Hz, 59.94 Hz, and other non-standard values.
Solution Approach 2:
The system implements feedback by continuously monitoring the actual refresh rate and comparing it against expected divisor values. When a non-divisor refresh rate is detected, the system activates compensation mechanisms that adjust driving parameters in real-time. This feedback loop ensures that brightness and color consistency is maintained regardless of the selected refresh rate, enabling flexible adaptability while preserving display performance.
2Manufacturing precision
If different driving schemes are applied for non-divisor refresh rates, then brightness and color performance consistency is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by creating a unified driving scheme that can handle both divisor and non-divisor refresh rates using the same fundamental compensation mechanism. The system uses a single set of lookup tables and adjustment parameters that work across all refresh rates, eliminating the need for separate specialized driving circuits for each refresh rate type. This multi-functional approach maintains performance consistency while minimizing the increase in device complexity.
Solution Approach 2:
Rather than implementing completely different driving circuits for non-divisor refresh rates, the system uses parameter changes - specifically adjusting voltage levels and time constants - to achieve the desired performance. This approach maintains the same basic driving architecture while achieving different performance characteristics through parameter modulation, thereby improving brightness and color consistency without proportionally increasing device complexity.
Data Source
AI summary
Front-of-screen performance of the electronic display may be highly sensitive to timing settings of emission and anode reset frequencies. Changes in the timing settings may result in diverging brightness and color performance on the electronic display, which may negatively impact user experience. In some cases, emission frequency of the self-emissive display pixels may be fixed at a value, such as 120 Hertz (Hz), 240 Hz, or 480 Hz. The anode reset frequency may be set at a divisor of the emission frequency. Some refresh rates may be divisors of the pixel emission frequency. However, other refresh rates may not be divisors of the pixel emission frequency. For such non-divisor refresh rates, different driving schemes may be used to compensate for a difference from the pixel emission frequency.