Display Pixel Circuit Sharing Capacitors for High Voltage
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Solution Overview
Problem
Display devices often require higher voltages than what general-purpose source drivers can supply, leading to increased power consumption and the need for specialized driver ICs, while also aiming to enhance image luminance, aperture ratio, and reliability.
Innovation Solution
A display apparatus with a pixel circuit structure that includes transistors and capacitors, allowing for high voltage supply and efficient data addition, using metal oxide transistors with In, Zn, and M (such as Al, Ti, Ga, Ge, Sn, Y, Zr, La, Ce, Nd, or Hf) in the channel formation region to increase capacitance and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high output source driver is used to supply higher voltage to display devices, then the driving capability is improved, but power consumption increases
Solution Approach 1:
The patent combines two pixel circuits into one shared circuit structure, allowing two pixels to share common transistors and capacitors. This merging reduces the total number of components needed while maintaining the ability to drive display devices at required voltages, thereby reducing overall power consumption of the driver circuitry
2Power
If a high output source driver is used to supply higher voltage to display devices, then the driving capability is improved, but a new driver IC needs to be developed
Solution Approach 1:
The shared circuit structure is designed to be universally applicable to multiple pixel circuits. The common transistors and capacitors can serve multiple functions across different pixels, allowing the same circuit design to be reused throughout the display panel without requiring custom driver IC development for each pixel
3Illumination intensity
If the aperture ratio of pixel is increased, then the luminance is enhanced, but the circuit area increases
Solution Approach 1:
By merging adjacent pixel circuits and sharing common components (transistors and capacitors), the patent reduces the total circuit area required. This allows more space to be allocated to the aperture area of each pixel, thereby increasing luminance without proportionally increasing the overall circuit footprint
Data Source
AI summary
A display apparatus capable of supplying a high voltage to a display device is provided. A pixel has a function of retaining first data, a function of adding second data to the first data to generate third data, and a function of supplying the third data to the display device. Capacitive coupling by a capacitor is used for data addition. Two pixels provided in the vertical direction (the direction in which a source line extends) share components including the capacitor; thus, the area where the two pixels are provided can be assigned to the capacitor, which can increase the capacitance value. Thus, the data addition by the capacitive coupling can be efficiently performed.