Pixel Circuit Gate Layout for Luminance-Stable OLED Displays
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Solution Overview
Problem
Light emitting display devices experience display quality deterioration due to characteristic differences among pixels, leading to initial luminance differences and impaired variable refresh rate characteristics.
Innovation Solution
The display device incorporates a pixel circuit design with transistors having different gate electrode configurations and insulation layer thicknesses to equalize capacitance and response times across pixels, utilizing transistors with double-gate and single-gate modes to stabilize initialization voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit design is used, then the device structure is simple, but display quality deteriorates due to characteristic differences among pixels
Solution Approach 1:
The patent applies local quality by configuring different gate electrode structures in different pixel circuits. Specifically, some pixel circuits include transistors with double gate electrodes while others have single gate electrodes, allowing localized optimization of capacitance characteristics to compensate for pixel-to-pixel variations without requiring complete redesign of all circuits
Solution Approach 2:
The patent changes physical parameters by varying the number of gate electrodes and insulation layer thicknesses in different pixel circuits. This adjusts the capacitance values of transistors locally to compensate for characteristic differences among pixels, thereby improving display quality consistency through parameter optimization
2Ease of manufacture
If pixels with different capacitance characteristics are used, then device manufacturing is easier, but initial luminance differences occur
Solution Approach 1:
The patent changes capacitance parameters by configuring different numbers of gate electrodes and varying insulation layer thicknesses in different pixel circuits. This allows adjustment of electrical characteristics to compensate for manufacturing variations, achieving luminance uniformity without requiring extremely precise fabrication tolerances
3Device complexity
If standard transistor configuration is used in all pixels, then device structure is uniform, but response time varies among pixels
Solution Approach 1:
The patent applies local quality by configuring transistors with different gate electrode structures in different pixel circuits. Some pixels use double-gate transistors while others use single-gate transistors, allowing localized optimization of response time characteristics based on specific pixel requirements rather than using a uniform configuration throughout
Solution Approach 2:
The patent introduces dynamic optimization by varying transistor configurations across different pixel circuits. This creates a heterogeneous structure where response times can be locally adjusted through different gate electrode arrangements, enabling adaptive compensation for performance variations
4Adaptability or versatility
If variable refresh rate operation is implemented, then display adaptability improves, but luminance instability occurs due to pixel characteristic differences
Solution Approach 1:
The patent changes electrical parameters by configuring different capacitance values through varying gate electrode structures and insulation layer thicknesses. This allows optimization of charge storage and release characteristics in different pixel circuits, stabilizing luminance during variable refresh rate operations by compensating for pixel-to-pixel variations
Solution Approach 2:
The patent applies preliminary action by pre-configuring different transistor structures in different pixel circuits to anticipate and compensate for characteristic variations before they manifest as display defects. This proactive design approach ensures luminance stability during dynamic refresh rate changes
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 design effectively reduces display quality deterioration by minimizing initial luminance differences and improving response consistency across pixels, enhancing image quality and refresh rate performance.
Implementation Method 1
a first pixel which displays a first color, where the first pixel includes a first light emitting diode
Data Source
AI summary
A light emitting display device includes: a first pixel which displays a first color, and includes a first light emitting diode and a first pixel circuit portion connected to the first light emitting diode; and a second pixel which displays a second color, and includes a second light emitting diode and a second pixel circuit portion connected to the second light emitting diode. The first pixel circuit portion includes an initialization transistor which transmits an initialization voltage to the first light emitting diode, and the initialization transistor of the first pixel circuit portion includes a first gate electrode and a second gate electrode which receive a gate-on voltage. The second pixel circuit portion includes an initialization transistor which transmits the initialization voltage to the second light emitting diode, and the initialization transistor of the second pixel circuit portion includes a first gate electrode which receives the gate-on voltage.