Compensation Capacitor Voltage Stabilization for Display Hysteresis
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Solution Overview
Problem
Compact and high-resolution display devices experience luminance issues such as color smear due to hysteresis, which affects the quality of images displayed.
Innovation Solution
The implementation of compensation capacitors in the pixel driving circuits of the display device, which stabilize voltage and adjust the on-bias voltage of driving transistors, thereby reducing hysteresis effects. Additionally, capacity control of compensation capacitors allows for differentiation of on-bias voltage for each color pixel, adjusting light emission amounts and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation capacitors are added to stabilize voltage and adjust on-bias voltage, then hysteresis effects are reduced and image quality improves, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the compensation capacitor structure: voltage stabilization, on-bias voltage adjustment, and hysteresis compensation are all achieved through the same capacitor component connected to the power line and transistor electrode, reducing the need for separate components
Solution Approach 2:
The compensation capacitor serves multiple purposes simultaneously: it stabilizes the power line voltage, adjusts the on-bias voltage of the driving transistor, and compensates for hysteresis effects, making a single component perform several critical functions
2Reliability
If capacity control of compensation capacitors is used to differentiate on-bias voltage for each color pixel, then light emission timing is adjusted and color smear is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different capacitance values to compensation capacitors in different color pixels (RGB) to provide localized optimization for each color channel, allowing each pixel type to have tailored on-bias voltage characteristics that compensate for color-specific hysteresis effects
Solution Approach 2:
The invention changes the capacitance parameter of the compensation capacitors to differentiate between color pixels, using specific capacitance values (e.g., different areas of overlapping electrodes) to adjust on-bias voltage and light emission timing for each color
3Stability of the object's composition
If power line is electrically connected to electrode layers above and below semiconductor layer, then voltage stabilization is improved and hysteresis is compensated, but device structure becomes more complex
Solution Approach 1:
The patent nests the power line connection within the existing multi-layer electrode structure, where the power line connects to electrode layers that are already positioned above and below the semiconductor layer, utilizing the existing spatial arrangement rather than adding external connection structures
Solution Approach 2:
The invention adds vertical dimensionality to the power line connection by connecting to electrode layers at different heights (above and below the semiconductor layer), creating a three-dimensional electrical connection network that provides voltage stabilization without increasing horizontal footprint
Data Source
AI summary
A display device includes: a first electrode layer; a semiconductor layer including a source region, a drain region, and a channel region, wherein at least a portion of the source region or the drain region overlaps the first electrode layer; a second electrode layer arranged adjacent to the channel region; a third electrode layer overlapping the second electrode layer and at least a portion of the source region or the drain region; and a power line electrically connected to the first electrode layer and the third electrode layer.