Display Device Pixel Circuit Capacitive Coupling Voltage Boost
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Solution Overview
Problem
Current display devices face challenges in achieving high image quality, supplying voltages higher than the output voltage of source drivers, enhancing luminance, increasing frame frequency, and reducing power consumption while maintaining reliability.
Innovation Solution
A display device structure that includes multiple nodes and transistors with capacitive coupling to generate and supply higher data potentials to display elements, allowing for improved image quality, increased luminance, and higher frame frequencies while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional source driver output voltage is used, then device complexity is reduced, but luminance and image quality deteriorate
Solution Approach 1:
The pixel circuit is divided into multiple functional nodes (first node, second node, third node) that can independently store and process data potentials. This segmentation allows the circuit to generate higher voltages through capacitive coupling between nodes without requiring a high-voltage source driver, thereby increasing luminance while maintaining manageable device complexity.
Solution Approach 2:
The invention transitions from a single-voltage-source architecture to a multi-node capacitive coupling architecture. By adding the dimension of multiple storage nodes coupled through capacitors, the system can generate higher output voltages (Vdata1 + Vdata2) without increasing the source driver output voltage, thus improving luminance without proportionally increasing device complexity.
2Productivity
If higher frame frequency is achieved, then productivity is improved, but power consumption increases
Solution Approach 1:
Data potentials are pre-charged and stored in the first and second nodes during the write phase before the display phase. This preliminary action allows the pixel circuit to maintain high frame frequencies by quickly switching between pre-charged states without requiring continuous high-power driving during the display phase, thus improving productivity while controlling power consumption.
3Power
If voltage higher than source driver output is supplied to display element, then luminance is enhanced, but device complexity increases
Solution Approach 1:
Capacitors are introduced as intermediary elements between the data signal source and the display element. These capacitors store and transfer charge to generate the higher voltage needed for enhanced luminance. The intermediaries (capacitors C1 and C2) enable voltage multiplication without requiring complex high-voltage generation circuits, thus achieving higher power delivery with controlled device complexity.
4Measurement precision
If image quality is improved, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The pixel circuit operates in periodic cycles: during the write phase, data potentials are charged to the first and second nodes; during the display phase, these potentials are coupled through capacitors to generate high-quality display voltages. This periodic operation allows high image quality to be achieved during the display phase while power consumption is reduced during the refresh transitions, balancing image quality and power consumption.
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 solution enables display devices to provide higher voltage to display elements, enhance image quality, increase frame frequency, and reduce power consumption, resulting in a more reliable and efficient display technology.
Implementation Method 1
a function of generating second data in the first node by capacitive coupling between the first data held in the first node and the first data read out to the third node
Data Source
AI summary
A display device capable of improving the image quality is provided. The display device includes a pixel in which a first node, a second node, a third node, and a display element are provided, and the same image data is written to the first node and the second node first. Then, at the same time when the image data is read from the second node to the third node, the image data is added to the image data in the first node by capacitive coupling. This operation enables a data potential higher than or equal to the output voltage of a source driver to be supplied to the display element.