Transparent Display Device with Multi-Layer Electrode Structure
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Solution Overview
Problem
Existing display devices face challenges in achieving high visible-light transmittance, high aperture ratio, low power consumption, reliability, and stable operation across a wide temperature range.
Innovation Solution
A display device design incorporating two transistors, a liquid crystal material layer, and a specific electrode structure that allows for high visible-light transmittance and aperture ratio, with a field-sequential driving method, and the use of conductive layers that transmit visible light, enabling efficient power management and temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional display device structures are used, then manufacturing and operation are straightforward, but visible-light transmittance and aperture ratio are limited
Solution Approach 1:
The display device is divided into multiple functional layers including first and second insulating layers, first and second conductive layers, pixel electrodes, and liquid crystal material layers. Each layer is positioned at specific locations to optimize light transmission paths while maintaining electrical functionality, thereby achieving high visible-light transmittance without excessive overall complexity
Solution Approach 2:
Different regions of the display device are designed with different properties: the first conductive layer and second conductive layer are positioned to transmit visible light in specific areas, while insulating layers provide electrical isolation where needed. This localized optimization allows high aperture ratio in light-transmitting regions while maintaining necessary electrical structure complexity only where required
2Illumination intensity
If more components are added to improve transmittance and aperture ratio, then visible-light transmission improves, but power consumption increases
Solution Approach 1:
The first conductive layer serves multiple functions: it acts as an electrode for liquid crystal control and simultaneously functions as a light-transmitting structure that contributes to the aperture ratio. The second conductive layer similarly serves both electrical and optical functions. This multi-functionality reduces the need for additional separate components that would increase power consumption
Solution Approach 2:
The pixel electrode structure is merged with the conductive layers to form an integrated electrode system. The first conductive layer, second conductive layer, and pixel electrode work together as a unified electrical and optical structure, eliminating the need for separate additional components and reducing overall power consumption while maintaining high aperture ratio
3Illumination intensity
If complex electrode structures are used to achieve high transmittance, then visible-light transmission improves, but reliability and temperature stability deteriorate
Solution Approach 1:
The liquid crystal material layer is extracted as a separate functional component positioned between the first and second conductive layers. This separation allows the conductive layers to be optimized for electrical stability and temperature resistance independently, while the liquid crystal material handles the optical modulation function, thereby improving overall reliability and temperature stability
Solution Approach 2:
The first insulating layer and second insulating layer serve as intermediary structures that electrically isolate different conductive elements while allowing optical transmission. These insulating layers act as mediators that prevent electrical interference and instability, thereby improving reliability and temperature stability while maintaining high visible-light transmittance through the electrode structure
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 solution provides a display device with enhanced visible-light transmittance, high aperture ratio, low power consumption, and reliable operation across a wide temperature range, suitable for applications requiring transparency and efficiency.
Implementation Method 1
a layer containing a liquid crystal material is positioned over the pixel electrode
Data Source
AI summary
A display device with a high aperture ratio is provided. The display device includes, in a pixel, a first transistor, a second transistor, a first insulating layer, a second insulating layer, a conductive layer, a pixel electrode, a layer containing a liquid crystal material, and a common electrode. The first insulating layer is positioned over a channel formation region of the first transistor. The conductive layer is positioned over the first insulating layer. The second insulating layer is positioned over the first transistor, the second transistor, the first insulating layer, and the conductive layer. The pixel electrode is positioned over the second insulating layer, the layer containing a liquid crystal material is positioned over the pixel electrode, and the common electrode is positioned over the layer containing a liquid crystal material. The common electrode overlaps with the conductive layer with the layer containing a liquid crystal material and the pixel electrode therebetween. The pixel includes a first connection portion where the conductive layer is electrically connected to the first transistor and a second connection portion where the pixel electrode is electrically connected to the second transistor. The conductive layer, the pixel electrode, and the common electrode each have a function of transmitting visible light.