Display Panel Luminance Compensation via MTP Curve Derivation
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Solution Overview
Problem
Display devices face reduced luminance over time due to degradation of light emitting elements and driving circuits, leading to inconsistent luminance characteristic curves across manufactured panels, which existing compensation methods fail to accurately address without increasing manufacturing time.
Innovation Solution
A method involving multi-time programming (MTP) operations to measure test luminances at different time points, deriving a luminance equation to represent the relationship between driving time and luminance, and adjusting reference gamma voltages based on this equation to compensate for luminance changes, thereby preventing the need for additional measurement equipment and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If iterative measurement is performed for each display device to obtain its own luminance characteristic curve, then measurement precision is improved, but manufacturing time increases
Solution Approach 1:
The luminance measurement process is segmented into multiple time points during the MTP operation. Instead of performing a complete iterative measurement for each device, the measurement is divided into discrete sampling points (e.g., at different gray value levels) that can be captured during the existing MTP process, reducing the overall measurement time while maintaining accuracy.
Solution Approach 2:
The luminance characteristic curve is derived in advance during the MTP operation before the display device is shipped. By measuring luminance at multiple time points during the MTP process and deriving the characteristic curve beforehand, the system eliminates the need for time-consuming iterative measurements after manufacturing, thus reducing manufacturing time while ensuring accurate luminance compensation.
2Loss of time
If a single luminance characteristic curve is derived from one display device, then manufacturing time is reduced, but measurement precision deteriorates
Solution Approach 1:
The system incorporates feedback mechanisms where the measured luminance values at different time points are used to adjust and refine the luminance characteristic curve. The driving circuit uses the derived curve to compensate for luminance degradation in real-time, ensuring that even though only one device is measured, the compensation accuracy is maintained through continuous feedback and adjustment based on actual luminance readings.
Solution Approach 2:
The system changes measurement parameters by taking luminance readings at multiple different time points during the MTP operation rather than a single measurement. This multi-point sampling approach allows accurate derivation of the luminance characteristic curve from a single device, capturing the temporal evolution of luminance degradation without requiring measurements from multiple devices.
3Measurement precision
If luminance measurement is performed separately from MTP operation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The luminance measurement function is merged with the existing MTP operation. The measurement unit performs luminance measurements at multiple time points during the MTP process without requiring a separate measurement system or additional hardware. This integration maintains measurement precision by using the same measurement infrastructure while avoiding the complexity of adding dedicated measurement equipment.
Solution Approach 2:
The MTP operation is given multi-functionality by simultaneously performing its original purpose (setting luminance for different gray values) and conducting luminance characteristic measurements. The driving circuit and measurement unit are designed to serve both the MTP function and the luminance characterization function, eliminating the need for separate dedicated measurement systems and reducing overall device complexity.
Data Source
AI summary
A method of compensating luminance of a display panel, the method including respectively measuring, at different time points, test luminances of the display panel driven by test data while a multi-time programming (MTP) operation for setting the luminance of the display panel respectively for one or more gray values is performed, and deriving a luminance equation representing a relationship between a driving time of the display panel and the luminance of the display panel from the time points and the test luminances.