Self-luminous Display Panel Driving Method for Threshold Correction
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Solution Overview
Problem
In self-luminous display panels of the active matrix driving type, variations in threshold voltage and mobility of driving transistors lead to luminance dispersion, complicating the correction process and reducing screen resolution due to complex pixel circuit structures and high component counts.
Innovation Solution
A driving method that executes threshold value correction operations in multiple periods, controlling the drain electrode potential to an intermediate or initialization potential during preparation periods to prevent bootstrap operation and reduce hold voltage drops, ensuring accurate and continuous correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If threshold value correction operation is executed continuously without division, then correction accuracy can be maintained, but the operation cannot be completed within one horizontal scanning period due to time constraints
Solution Approach 1:
The threshold value correction operation is divided into multiple correction periods (first correction period, second correction period, etc.) separated by suspension periods. This segmentation allows the correction operation to be performed multiple times within the horizontal scanning period, improving correction accuracy while managing time constraints through strategic division of the correction process.
2Manufacturing precision
If complex pixel circuit structures with correction functions are used, then luminance uniformity can be improved, but device complexity increases and screen resolution is reduced
Solution Approach 1:
The driving transistor itself performs the threshold value correction function through self-service mechanisms. By utilizing the transistor's own characteristics and controlling its operation states during different periods (preparation, correction, suspension), the system achieves correction functionality without adding separate correction circuits or complex pixel circuit structures, thus maintaining screen resolution while improving luminance uniformity.
3Measurement precision
If threshold value correction is performed multiple times within horizontal scanning period, then correction accuracy improves, but hold voltage drops and overcorrection may occur during suspension periods
Solution Approach 1:
In the preparation period before the correction operation, the drain electrode potential is controlled to an intermediate potential or initialization potential. This preliminary action prepares the transistor state in advance, ensuring that when the correction operation resumes after suspension periods, the hold voltage is already in an appropriate state, preventing overcorrection and maintaining stability.
Solution Approach 2:
The drain electrode potential is dynamically changed to different values (first potential for lighting driving, second potential for initialization, intermediate potential during suspension) based on the operational period. This parameter change strategy allows the system to maintain hold voltage stability while enabling multiple correction operations, as each potential level is optimized for its specific functional requirement.
Data Source
AI summary
A self-luminous display panel driving method for driving a self-luminous display panel of the active matrix driving type, includes the step of executing threshold value correction operation for a driving transistor divisionally in a plurality of periods within at least one of which, after a point of time of an end of a preceding correction period till a point of time of a start of a succeeding correction period, a potential to be applied to the drain electrode of the driving transistor is controlled to an intermediate potential between a first potential for lighting driving of the driving transistor and a second potential for initialization applied within a preparation period of the first one of the correction periods.