Transparent Memory Pixel Structure for High-Aperture Displays
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Solution Overview
Problem
Current display devices face challenges in increasing the aperture ratio and reducing power consumption while maintaining high display quality, particularly in the integration of memory functions within pixels.
Innovation Solution
A display device structure that includes a pixel with a memory function, utilizing light-transmitting materials for circuits and electrodes to enhance aperture ratio, and employing a combination of transistors and capacitors with low resistivity for reduced wiring resistance and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a channel layer of a transistor is formed using a light-transmitting oxide semiconductor layer and gate, source, and drain electrodes are formed using transparent conductive films, then the aperture ratio is increased, but the electrical resistance of the electrodes increases
Solution Approach 1:
The patent applies composite materials by combining transparent conductive films (such as ITO, SnO2) with metal films to form auxiliary wirings and capacitor electrodes. This composite structure maintains light-transmitting properties while reducing electrical resistance, as the metal component provides high conductivity and the transparent conductive film provides optical transparency.
Solution Approach 2:
The transparent conductive films serve multiple functions: they act as gate electrodes, source electrodes, drain electrodes, and capacitor electrodes simultaneously. This multi-functionality allows the same material to provide both optical transparency for high aperture ratio and electrical conductivity for low resistance, resolving the contradiction between these two requirements.
2Area of stationary object
If transparent conductive films are used for gate, source, and drain electrodes, then the aperture ratio is increased, but the power consumption increases due to higher resistance
Solution Approach 1:
By creating composite electrode structures combining transparent conductive films with metal films, the patent achieves low electrical resistance (reducing power consumption) while maintaining high optical transparency (high aperture ratio). The metal component provides excellent conductivity to minimize energy loss.
3Reliability
If memory functions are integrated within pixels, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The patent merges memory functions with pixel structures by integrating capacitors and transistors within the pixel unit. This combination allows data holding capability to be built into each pixel, improving display quality through better image holding and reduced flicker, while the systematic integration keeps complexity manageable.
Solution Approach 2:
The transistor structures serve multiple functions: they act as switching elements for pixel selection and as part of the memory circuit for data storage. This multi-functionality reduces the need for separate dedicated components, thereby improving display quality without proportionally increasing device complexity.
Data Source
AI summary
A display device including a pixel having a memory. The pixel includes at least a display element, a capacitor, an inverter, and a switch. The switch is controlled with a signal held in the capacitor and a signal output from the inverter so that voltage is supplied to the display element. The inverter and the switch can be constituted by transistors with the same polarity. A semiconductor layer included in the pixel may be formed using a light-transmitting material. Moreover, a gate electrode, a drain electrode, and a capacitor electrode may be formed using a light-transmitting conductive layer. The pixel is formed using a light-transmitting material in such a manner, whereby the display device can be a transmissive display device while including a pixel having a memory.