Array Substrate Gate Driver Waveform Chamfering
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Solution Overview
Problem
Existing array substrates face challenges in maintaining a stable pixel voltage, leading to flicker uniformity and image quality issues due to the difference between the sustaining voltage of the pixel electrode and the charging voltage.
Innovation Solution
The array substrate design includes first and second gate lines on both sides of the pixel electrode, forming storage capacitors, and a gate driver that performs a waveform chamfering operation to ensure the pixel electrode's voltage is maintained equal to the charging voltage, using a combination of storage capacitors and a chamfered waveform with a slope between 0.8 to 1.6.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional storage capacitor structure (Cs on gate) is used, then the pixel voltage stability is improved, but the sustaining voltage differs from charging voltage causing flicker uniformity issues
Solution Approach 1:
The single storage capacitor function is segmented into two separate storage capacitors (first storage capacitor between first gate line and pixel electrode, second storage capacitor between second gate line and pixel electrode). This segmentation allows independent control of charging and sustaining phases, enabling the sustaining voltage to match the charging voltage while maintaining stability, thereby resolving the flicker uniformity issue.
2Stability of the object's composition
If the pixel electrode is covered by scanning line to form storage capacitor, then voltage stability is improved, but the charging time is affected
Solution Approach 1:
The charging and sustaining functions are segmented into different gate lines and time phases. The first gate line handles charging while the second gate line handles sustaining, allowing simultaneous optimization of both charging speed and voltage stability without mutual interference, thus resolving the charging time issue.
Solution Approach 2:
The gate driver performs periodic waveform chamfering operations on the gate signals, alternating between charging phase (first gate line active) and sustaining phase (second gate line active). This periodic action ensures that charging completes quickly while maintaining stable pixel voltage throughout the frame period, resolving both stability and timing concerns.
3Reliability
If waveform chamfering operation is performed to maintain sustaining voltage equal to charging voltage, then flicker uniformity is improved, but device complexity increases
Solution Approach 1:
The gate driver implements dynamic waveform chamfering that adjusts gate signal characteristics in real-time during operation. By dynamically controlling the timing and amplitude of gate signals on first and second gate lines, the system maintains sustaining voltage equal to charging voltage without requiring additional hardware components, thus improving flicker uniformity while managing complexity through software/firmware control.
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 solution ensures the sustaining voltage of the pixel electrode is almost equal to the charging voltage, improving flicker uniformity and image quality without affecting the charging time, thereby enhancing the display performance.
Implementation Method 1
The pixel electrode in the array substrate and the gate lines on both sides thereof respectively form storage capacitors
Implementation Method 2
a parasitic capacitor being formed between the gate electrode and the source electrode
Data Source
AI summary
An array substrate, a driving method thereof and a display device are provided. The array substrate includes a base substrate, a pixel electrode located on the base substrate; a first gate line and a second gate line located on the base substrate at both sides of the pixel electrode, respectively, the pixel electrode being partially overlapped with the first gate line and the second gate line respectively to form a first storage capacitor and a second storage capacitor respectively; and a gate driver connected with the first gate line and the second gate line and configured to sequentially provide a gate signal to the first gate line and the second gate line and perform a waveform chamfering operation to the gate signal.