Shift Register With Detection Sub-Register for OLED Threshold Voltage Compensation
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Solution Overview
Problem
In OLED displays, the difference in threshold voltages of driving transistors across pixel circuits leads to display defects due to the cascading effect of detection and compensation loads in gate driver circuits, weakening the cascading capability and affecting display stability and effect.
Innovation Solution
A shift register design incorporating both display and detection sub-shift registers, where the detection sub-shift register is configured to independently control and compensate for threshold voltage variations without being affected by the load of previous stages, ensuring stable operation and improved cascading capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection sub-shift register is integrated into the cascaded GOA circuit, then threshold voltage detection and compensation capability is improved, but the cascading capability is weakened due to load effects from previous stages
Solution Approach 1:
The shift register is divided into two independent sub-registers: a display sub-shift register for driving display signals and a detection sub-shift register for threshold voltage detection. Each sub-register has its own input terminal, output terminal, and control circuits. This segmentation allows the detection function to operate independently without being affected by the cascading load of previous stages, thus resolving the contradiction between detection precision and cascading stability.
2Reliability
If the detection part is added to each shift register, then display defect compensation is improved, but the device complexity increases
Solution Approach 1:
The detection sub-shift register is merged with the display sub-shift register in the same physical shift register unit, sharing common structural elements such as the shift register framework and control timing. The detection sub-register uses similar circuit components (transistors, capacitors) arranged in a parallel structure to the display sub-register. This merging approach allows threshold voltage detection and display driving to coexist in the same circuit unit without significantly increasing overall device complexity, while still achieving display stability improvement.
Data Source
AI summary
The present application provides a shift register and a method of driving the same, and a gate driving circuit. The shift register includes a detection sub-shift register. The detection sub-shift register includes: a detection input sub-circuit configured to provide a signal of the first input terminal to the pull-up control node under the control of the first clock signal terminal, and provide a signal of the second clock signal terminal to the first pull-up node under the control of the pull-up control node; and a detection output sub-circuit configured to provide a signal of the third clock signal terminal to the first output terminal under the control of the first pull-up node.