OLED Pixel Periodic Voltage Control for Threshold Compensation
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Solution Overview
Problem
Organic light emitting display devices face image quality issues due to deviations in threshold voltage and variability of data voltage, leading to deteriorated image quality.
Innovation Solution
An organic light emitting display device and method that includes a display panel with data lines, gate lines, and pixels, where pixels operate in periods with applied data voltage, remaining data voltage, and no light emission, allowing adjustment of the ratio between these periods and application of preset voltages to improve image quality by compensating for threshold voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a data voltage is applied to pixels continuously, then the image display function is maintained, but threshold voltage deviation causes image quality deterioration
Solution Approach 1:
The patent applies periodic action by dividing the pixel operation into distinct periods: a first period where data voltage is applied and light emitting occurs, a second period where data voltage is maintained but light emitting is suppressed, and a third period for threshold voltage compensation. This periodic structure allows the system to address threshold voltage deviation without compromising continuous image display functionality.
Solution Approach 2:
The patent implements preliminary action by performing threshold voltage compensation during the first period before the data voltage is fully applied and before image display begins. By compensating for threshold voltage deviation in advance, the system ensures accurate image quality throughout the subsequent display periods without requiring continuous correction.
2Reliability
If the data voltage is remained applied to prevent voltage variance, then image quality stability is improved, but energy consumption increases due to continuous voltage application
Solution Approach 1:
The patent uses periodic action to maintain data voltage during specific periods (first and second periods) while suppressing light emitting during the second period. This allows the system to maintain voltage stability for image quality without requiring continuous active light emitting, thereby reducing energy consumption during non-display periods.
Solution Approach 2:
The patent maintains continuous application of data voltage throughout the first and second periods to ensure image quality stability and prevent voltage variance. By keeping the voltage continuously applied rather than switching it off, the system maintains readiness for immediate display while reducing energy consumption compared to continuous light emitting.
3Reliability
If the pixel operates in multiple periods with different functions, then threshold voltage compensation is achieved, but device complexity increases
Solution Approach 1:
The patent implements periodic action by dividing pixel operation into three distinct periods with different functions: first period for data voltage application and light emitting, second period for voltage maintenance without light emitting, and third period for threshold voltage compensation. This structured periodic approach enables comprehensive threshold voltage compensation while maintaining clear control logic through standardized period transitions.
4Reliability
If the ratio between second period and third period is adjusted, then image quality is optimized, but control complexity increases
Solution Approach 1:
The patent applies dynamics by making the ratio between the second period (voltage maintenance) and third period (threshold compensation) adjustable rather than fixed. This dynamic adjustment capability allows optimization of image quality for different display conditions and requirements, while the systematic period structure maintains relatively simple control logic compared to entirely flexible timing control.
Data Source
AI summary
The present disclosure describes an organic light emitting display device including: a display panel including data lines, gate lines, emission lines, and pixels, a data driver applying data signals to the data lines, and a gate driver applying gate signals and emission signals to the gate lines and the emission lines, respectively. At least one of the pixels may be operated in a first period in which a data voltage is applied, a second period in which the data voltage is remained and a driving current is provided according to the data voltage, and a third period in which the data voltage is remained and light emitting is not performed, where a ratio between lengths of the second and third periods can be adjusted. The at least one pixel may receive a preset voltage in the second period and the third period.