Display Device Threshold Sensing for Real-Time Compensation
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Solution Overview
Problem
Existing display technologies face challenges in compensating for variations in threshold voltages of driving transistors in real time, leading to deviations in luminance among subpixels and degrading image quality.
Innovation Solution
A display device and driving method that includes a plurality of data and reference voltage lines, with each subpixel connected to these lines, allowing for real-time compensation of threshold voltage variations by setting a voltage difference between data and reference voltages to match the threshold voltage of the driving transistor, and using storage capacitors to maintain voltage differences during specific time periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional threshold voltage compensation technology is used to sense the threshold voltage of driving transistors, then threshold voltage sensing and compensation can be performed, but a considerable time is required to sense the threshold voltage of one driving transistor, making it impossible to sense and compensate in real time during display driving
Solution Approach 1:
The patent divides the sensing process into two distinct modes: a first type sensing mode during blank time periods that measures actual threshold voltage by allowing voltage to rise at the second node, and a second type sensing mode during active time periods that uses predetermined voltage differences for faster compensation. This segmentation allows the system to use the accurate but slow first type sensing less frequently while maintaining real-time compensation capability through the faster second type sensing.
Solution Approach 2:
The patent pre-stores threshold voltage-related information in a memory device based on characteristics obtained from initial sensing. During active time periods, the system uses this predetermined information to quickly determine appropriate data voltages without performing complete threshold voltage sensing, enabling real-time compensation while avoiding the time-consuming measurement process during critical display periods.
2Manufacturing precision
If threshold voltage compensation is performed frequently to maintain luminance uniformity, then image quality improves, but power consumption increases
Solution Approach 1:
The patent implements periodic sensing during blank time periods to update threshold voltage information, followed by application of this information during subsequent active time periods. This periodic approach maintains luminance uniformity by regularly updating compensation parameters while consuming power only during the brief blank periods rather than continuously during active display periods.
Solution Approach 2:
The patent performs threshold voltage sensing and stores the results in advance during blank time periods. This preliminary action allows the system to use the pre-obtained threshold voltage information for multiple subsequent active periods without repeated sensing, thereby maintaining good luminance uniformity while significantly reducing overall power consumption by avoiding continuous sensing operations.
Data Source
AI summary
According to embodiments of the present disclosure, there may be provided a display device and a driving method. During a first type sensing time period during display driving, a voltage difference between a first node and a second node of a driving transistor is set to correspond to a threshold voltage stored in a memory, whereby it is possible to compensate for, in real time period, threshold voltage variations of driving transistors.