Display Panel Degradation Compensation via Sensing Mode
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Solution Overview
Problem
Display devices, such as OLED and LCD panels, experience degradation over time, leading to reduced image quality and accuracy in grayscale and luminance.
Innovation Solution
A display device and method that sense the driving current on a block basis under high and low current points, generating compensation factors to adjust threshold voltage and electron mobility characteristics of the driving transistor, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If display devices are used for extended periods, then they provide continuous operation, but image quality degrades over time
Solution Approach 1:
The patent applies preliminary action by performing degradation compensation in advance through a sensing mode that measures threshold voltage and electron mobility characteristics before they cause significant image quality degradation. The system calculates compensation factors and applies them to correct pixel data, preventing the manifestation of degradation effects during normal display operation.
Solution Approach 2:
The patent implements feedback by continuously monitoring the actual electrical characteristics of driving transistors through sensing operations and using this information to dynamically adjust compensation factors. The system measures threshold voltage shifts and electron mobility changes, then feeds this information back to modify pixel data accordingly, creating a closed-loop system that maintains image quality despite ongoing degradation.
2Reliability
If degradation compensation is performed, then image quality is improved, but measurement precision requirements increase
Solution Approach 1:
The patent applies parameter changes by measuring multiple electrical parameters (threshold voltage and electron mobility) at different operating conditions. The system varies sensing voltages and measures corresponding currents to extract both threshold voltage shifts and electron mobility changes, using these parameter variations to calculate comprehensive compensation factors that address multiple aspects of transistor degradation.
Solution Approach 2:
The patent implements segmentation by separating the degradation compensation process into distinct components: threshold voltage compensation and electron mobility compensation. The system calculates separate compensation factors for each parameter based on independent sensing measurements, then combines these factors to generate overall pixel data corrections. This segmented approach allows precise measurement of each degradation aspect without requiring extremely high overall measurement precision.
3Measurement precision
If sensing operations are performed frequently, then compensation accuracy is improved, but operation time is consumed
Solution Approach 1:
The patent applies periodic action by performing sensing operations at regular intervals rather than continuously. The system switches between display mode and sensing mode periodically, conducting degradation measurements at predetermined time points while maintaining normal display operation between measurements. This periodic sensing approach achieves adequate compensation accuracy while minimizing the time lost to sensing operations.
Solution Approach 2:
The patent implements partial action by performing sensing operations on selected pixel blocks rather than all pixels simultaneously. The system divides the display panel into multiple blocks and conducts sensing measurements on representative samples from each block, using these partial measurements to infer degradation characteristics for the entire panel. This reduces the total sensing time while maintaining sufficient compensation accuracy.
Data Source
AI summary
A display device can include a display panel including a plurality of pixels, a data driver configured to apply a reference data voltage to the display panel in a sensing mode, a current sensor configured to, in the sensing mode, lower a high potential driving voltage supplied to the display panel, sense a driving current of the display panel while the reference data voltage and the lowered driving voltage are applied and convert the sensed driving current into sensing data. Additionally, the display device includes a controller configured to calculate a compensation factor based on the sensing data. Further, in a display mode, the compensation factor is used to compensate image data. In addition, provided is a method for compensating for degradation of a display device.