Display Panel Bias Control for Scan-Period Flicker Reduction
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Solution Overview
Problem
Display panels experience luminance differences and flicker due to bias operations during address and self scan periods, leading to reduced display quality.
Innovation Solution
Implement a bias control switching element that operates during the self scan period to prevent bias operations during the address scan period, reducing luminance differences and flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bias operation is performed during both address scan period and self scan period, then the driving switching element is continuously activated, but luminance difference and flicker occur between the two periods
Solution Approach 1:
The patent segments the scan periods into address scan period and self scan period, and further segments the bias operation control by introducing a bias control switching element that selectively activates the bias switching element only during the self scan period. This segmentation allows different operational modes for different time periods, preventing luminance difference and flicker between periods.
2Stability of the object's composition
If bias operation is continuously performed, then the driving switching element maintains stable operation, but luminance difference occurs between address scan period and self scan period
Solution Approach 1:
The patent implements periodic action by controlling the bias switching element to operate only during the self scan period and not during the address scan period. The bias control switching element enables this periodic control by activating the bias operation in a periodic manner synchronized with the scan periods, thereby maintaining driving stability while ensuring luminance consistency across different periods.
3Reliability
If the bias switching element is always active, then the first electrode of the driving switching element maintains stable voltage, but flicker occurs due to luminance difference between periods
Solution Approach 1:
The patent applies preliminary action by pre-configuring the bias control switching element to selectively enable the bias switching element only when needed (during self scan period). This preliminary control arrangement prevents the harmful flicker effect before it occurs by avoiding unnecessary bias operation during the address scan period, while still maintaining voltage stability during the self scan period when bias operation is beneficial.
Data Source
AI summary
A display panel includes: a light emitting element, a driving switching element, a bias switching element and a bias control switching element. The driving switching element is configured to apply a driving current to the light emitting element. The bias switching element is connected to a first electrode of the driving switching element and configured to apply a bias voltage to the first electrode of the driving switching element. The bias control switching element is connected to a first electrode of the bias switching element and configured to apply the bias voltage to the first electrode of the bias switching element.