Pixel Capacitor Overlap Layout for Voltage Boosting Displays
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Solution Overview
Problem
Existing display devices require higher drive voltages for dispersed liquid crystal devices and tandem light-emitting devices, leading to high power consumption and cost in source drivers, and compromising the aperture ratio and definition of pixels due to the need for additional components like transistors and capacitors.
Innovation Solution
A display apparatus with a pixel circuit that includes a first capacitor, a second capacitor, and a display element, where the capacitors are electrically connected to the display element and have specific structures with overlapping regions to enhance the boosting function without sacrificing aperture ratio or definition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a boosting function is provided in a pixel circuit to generate voltage higher than the output of a source driver, then the output voltage is increased, but the aperture ratio and definition are reduced due to additional components
Solution Approach 1:
The first capacitor and second capacitor are merged into a single capacitor structure where they share a common electrode (the second conductive layer). This integration allows the pixel circuit to achieve voltage boosting functionality while using fewer discrete components, thereby preserving aperture ratio and definition.
Solution Approach 2:
The combined capacitor structure serves multiple functions: it acts as both the first capacitor and second capacitor in the pixel circuit, enabling voltage boosting while maintaining compact area. The shared electrode design allows one physical structure to fulfill the electrical requirements of two logical capacitors.
2Power
If a general pixel circuit is used with a high-output source driver to drive dispersed liquid crystal device and tandem light-emitting device, then the driving capability is sufficient, but the cost and power consumption are high
Solution Approach 1:
The invention changes the electrical parameters within the pixel circuit by using two capacitors with different capacitance values (first capacitor with smaller capacitance, second capacitor with larger capacitance). This parameter configuration enables the pixel to internally generate the required high voltage for driving dispersed liquid crystal devices and tandem light-emitting devices, eliminating the need for expensive high-output source drivers and reducing overall power consumption.
Data Source
AI summary
A display apparatus having an excellent boosting function is provided. The display apparatus is provided with a pixel having a function of adding data (a boosting function). A capacitor for boosting voltage is provided in the pixel, and data is added by capacitive coupling to be supplied to a display device. The capacitor for boosting voltage and a capacitor for retaining data are placed on top of each other, whereby the capacitance value of the capacitor for boosting voltage can be increased. Thus, the pixel can have an excellent boosting function, without significantly losing the aperture ratio or definition.