Dual-Gate Pixel Circuit for Voltage-Stabilized Brightness Uniformity
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Solution Overview
Problem
The challenge of ensuring brightness uniformity of subpixels in display panels, particularly for AMOLED technology, remains unresolved, affecting the display effect.
Innovation Solution
A display substrate design incorporating a voltage stabilizing electrode and conductor portion for each subpixel, forming a voltage stabilizing capacitor to stabilize transistor voltages, thereby improving brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional AMOLED technology is used, then the display panel can be manufactured, but brightness uniformity of subpixels cannot be ensured
Solution Approach 1:
A voltage stabilizing electrode is introduced as an intermediary component between the power source signal line and the driving transistor. This electrode acts as a mediator to stabilize the voltage supplied to the driving transistor, thereby ensuring consistent brightness across all subpixels. The voltage stabilizing electrode includes a first portion coupled to the power source signal line and a second portion extending to overlap with the conductor portion, creating a capacitive coupling that filters voltage fluctuations.
Solution Approach 2:
The voltage stabilizing electrode is positioned and configured in advance during the manufacturing process to preemptively stabilize voltage before it reaches the driving transistor. The electrode's second portion is designed to overlap with the conductor portion of the first transistor in advance, creating a preliminary voltage stabilization effect that prevents brightness uniformity issues before they occur during display operation.
2Manufacturing precision
If voltage stabilizing electrode is added to each subpixel, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The voltage stabilizing electrode is merged with existing subpixel components rather than being added as a completely separate element. The electrode's first portion is coupled to the existing power source signal line, and its second portion overlaps with the existing conductor portion of the first transistor. This merging approach integrates voltage stabilization functionality into the existing subpixel structure, minimizing the increase in device complexity while achieving improved brightness uniformity.
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
The proposed design stabilizes transistor voltages, enhancing brightness uniformity across subpixels and improving the display panel's overall performance.
Implementation Method 1
an active layer of the first transistor includes a first semiconductor portion and a second semiconductor portion spaced apart from each other, and a conductor portion coupled to the first semiconductor portion and the second semiconductor portion. Each of first to (N−1)th subpixels in the first direction further includes a voltage stabilizing electrode. an orthogonal projection of the conductor portion onto the base substrate overlaps an orthogonal projection of the voltage stabilizing electrode of the (N−1)th subpixel in the row onto the base substrate
Data Source
AI summary
A display substrate, a manufacturing method thereof and a display device. The display substrate includes a base substrate and a plurality of subpixels arranged in an array form on the base substrate. Each subpixel includes a voltage stabilizing electrode, and a subpixel driving circuitry including a driving transistor, and a first transistor, a first electrode of which is coupled to a second electrode of the driving transistor, and a second electrode of which is coupled to a gate electrode of the driving transistor. An active layer of the first transistor includes a first semiconductor portion and a second semiconductor portion spaced apart from each other, and a conductor portion coupled to thereto. An orthogonal projection of the conductor portion onto the base substrate overlaps an orthogonal projection of voltage stabilizing electrode of a previous subpixel in the first direction onto the base substrate.