Transparent Memory Pixel Circuit for High-Aperture Displays
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Solution Overview
Problem
Existing display devices face challenges in increasing the aperture ratio while reducing power consumption and size, particularly in large displays and portable devices.
Innovation Solution
The use of light-transmitting transistors and capacitors in pixel circuits, combined with memory functions and light-transmitting wirings, allows for increased aperture ratio and efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional opaque transistors and wirings are used in pixel circuits, then electrical connectivity and device functionality are ensured, but the aperture ratio is reduced and light use efficiency is lowered
Solution Approach 1:
The transparent electrode structure is segmented into multiple functional layers: a base transparent electrode layer and separate auxiliary wiring layers. This segmentation allows each layer to perform its specific function (electrode function vs. wiring function) while maintaining overall transparency, thus increasing the aperture ratio without compromising electrical connectivity
Solution Approach 2:
The patent transitions from planar opaque structures to multi-layer transparent structures by adding the dimension of vertical stacking. Transparent conductive films are deposited in multiple layers at different positions, creating a three-dimensional transparent electrode system that maintains electrical functionality while maximizing light transmission area
2Use of energy by moving object
If the aperture ratio is increased by using light-transmitting materials for transistors and capacitors, then light use efficiency is improved, but power consumption and device size reduction requirements become more challenging
Solution Approach 1:
The transparent electrode structure serves multiple functions simultaneously: it acts as both the electrode for the electro-optic element and as auxiliary wiring for capacitor connections. This multi-functionality reduces the need for separate opaque wiring structures, thereby maintaining high aperture ratio while managing power consumption through efficient transparent conductive material usage
Solution Approach 2:
The patent changes the material parameters by using transparent conductive films (such as ITO, IZO, or other transparent oxides) with optimized thickness and conductivity. By adjusting these parameters, the structure achieves sufficient electrical conductivity for power delivery while maintaining high light transmission, thus balancing power consumption management with light use efficiency
3Reliability
If additional capacitor electrodes and auxiliary wirings are added to reduce electrical resistance, then electrical performance is improved, but the aperture ratio and structural simplicity are compromised
Solution Approach 1:
The auxiliary wiring for capacitor electrodes is merged with the transparent electrode structure itself. Instead of adding separate opaque wiring layers, the patent uses transparent conductive films to form both the electrode and the auxiliary wiring, combining multiple functions into a unified transparent structure that maintains high aperture ratio while reducing electrical resistance
Solution Approach 2:
Transparent conductive films serve as an intermediary material that bridges the functional requirements of electrodes and wirings. These films mediate between the need for low electrical resistance (requiring conductive materials) and the need for high light transmission (requiring transparent materials), providing a solution that satisfies both requirements simultaneously
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.