Gate Driver Multi-Scan Sensing for OLED Deterioration
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Solution Overview
Problem
Current OLED display technology faces inaccuracies in measuring OLED deterioration due to single-time current measurement, leading to potential undercompensation of luminance degradation and increased memory requirements for storing deterioration data.
Innovation Solution
A gate driver that consecutively outputs sensing signals to each scan line multiple times, allowing iterative measurement of OLED deterioration across rows, improving accuracy and reducing memory needs by measuring current multiple times during active periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-time current measurement is used for OLED deterioration sensing, then memory requirements are reduced, but measurement precision deteriorates leading to inaccurate deterioration assessment
Solution Approach 1:
The patent applies periodic action by repeatedly activating the sensing signal multiple times during the active period of each scan line. The sensing driving unit outputs sensing signals at different time points (e.g., at gray levels 0, 1, 2, 3) to iteratively measure OLED deterioration, replacing the conventional single-time measurement approach. This periodic measurement strategy improves measurement precision while managing data storage requirements through selective averaging of the periodic measurement results.
2Measurement precision
If sensing signal is activated multiple times per scan line, then measurement precision improves through iterative measurement, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent merges the sensing signal activation with the existing scan driving operation. The sensing driving unit utilizes the active period of the scan signal to embed multiple sensing measurements, rather than operating independently. By combining the sensing operations with the scan timing structure and using the gray level transition periods for sensing, the patent reduces device complexity while achieving iterative measurement precision.
Solution Approach 2:
The sensing driving unit leverages the existing gray level transition periods and active periods of the scan operation to perform sensing measurements. Instead of requiring separate dedicated time slots or additional control infrastructure, the system uses the self-existing temporal structure of the display refresh cycle to accommodate multiple sensing measurements per scan line, thereby reducing overall device complexity.
3Measurement precision
If iterative measurement is performed during active period, then measurement precision improves, but productivity decreases due to extended sensing time
Solution Approach 1:
The patent performs sensing measurements at selected gray level transitions (e.g., 4 measurements at gray levels 0, 1, 2, 3) rather than continuously during the entire active period. This partial action approach provides sufficient measurement precision for deterioration assessment without occupying the complete active period, thereby maintaining display refresh efficiency and productivity while achieving improved measurement accuracy.
Data Source
AI summary
A gate driver for a display device and a display device including the same are disclosed. In one aspect, the gate driver includes first through N-th scan drivers configured to respectively output first through N-th scan signals, where N is an integer greater than 1. The gate driver also includes first through N-th sensing drivers configured to respectively output first through N-th sensing signals, wherein an M-th one of the first through N-th sensing drivers is configured to activate an M-th one of the first through N-th sensing signals K times during an active period of an (M+1)-th one of the first through N-th scan signals, where M is an integer greater than 0 and less than N and K is an integer greater than 1.