Composite Scanning Period for Display Apparatus Threshold Correction
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Solution Overview
Problem
Existing active matrix display apparatuses face challenges in completing threshold voltage correction and signal potential writing operations within the shortened 1H period, especially as definition enhancement and higher speed driving progress, leading to difficulties in achieving uniform picture quality.
Innovation Solution
The display apparatus combines multiple scanning periods to form a composite scanning period, with a first period for threshold voltage correction and a second period for sequential signal potential writing, using a write scanner and power supply scanner to output control signals and power supply voltages efficiently, allowing for stable high-speed operations even with compressed 1H periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple scanning periods are combined to form a composite scanning period, then threshold voltage correction and signal potential writing operations can be completed stably, but the scanning period duration increases
Solution Approach 1:
The patent divides the composite scanning period into distinct segments: a first period dedicated to threshold voltage correction operations and a second period dedicated to signal potential writing operations. This segmentation allows each operation type to be performed systematically without interference, ensuring stable execution while managing the total time required through structured organization of operations within the extended scanning period.
2Speed
If the 1H period is shortened to enable higher speed driving, then driving speed increases, but threshold voltage correction and signal potential writing operations cannot be completed
Solution Approach 1:
The patent extends the scanning period from a single 1H period to a composite scanning period spanning multiple horizontal periods, effectively adding a temporal dimension. This allows threshold voltage correction and signal potential writing operations to be distributed across the extended time frame, ensuring completion while maintaining high driving speed through efficient utilization of the expanded scanning period.
3Measurement precision
If threshold voltage correction operation is performed sequentially line by line, then operation precision is maintained, but operation time increases
Solution Approach 1:
The patent performs threshold voltage correction operations during the first period of the composite scanning period, which occurs before the signal potential writing operations in the second period. This preliminary execution of correction operations ensures that threshold voltage values are accurately determined and stored in advance, maintaining correction precision while enabling subsequent writing operations to proceed efficiently without time conflicts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables stable execution of threshold voltage correction and signal potential writing operations, ensuring uniform picture quality and readiness for enhanced definition and increased driving speed, even under shortened scanning periods.
Implementation Method 1
The organic EL device utilizes a phenomenon that, if an electric field is applied to an organic thin film, then the organic thin film emits light.
Data Source
AI summary
A plurality of scanning periods are combined to form a composite period (2H). Within the first period of the front half, threshold value (Vth) correction is carried out all at once, and within the second period of the latter half, signal (Vsig) writing operation is carried out. High speed writing can be carried out even where the scanning period is shortened.