Electro-Optical Layer Structure for Light Shielding Without Substrate Cracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electro-optical devices face challenges in enhancing light-shielding properties for transistors without increasing the thickness of scanning lines, which can lead to substrate cracking due to thermal stress, and result in display defects like luminance unevenness.
Innovation Solution
The electro-optical device incorporates a substrate with a capacitance element and insulating films that have specific refractive indices and thicknesses, along with a light-shielding film, to enhance light reflection and reduce the need for excessively thick light-shielding films, thereby improving light-shielding properties without increasing the risk of substrate cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the scanning line is increased to enhance light-shielding properties, then the light-shielding effect is improved, but the substrate may be cracked due to thermal stress difference during manufacturing
Solution Approach 1:
The scanning line is divided into multiple thin layers (first scanning line layer, second scanning line layer, third scanning line layer) rather than using a single thick layer. This segmentation reduces thermal stress concentration while maintaining effective light shielding through the cumulative effect of multiple layers with different materials and optical properties.
Solution Approach 2:
The scanning line structure uses composite materials with different optical and thermal properties arranged in multiple layers. The first scanning line layer has different characteristics than the second and third layers, creating a composite structure that optimizes both light shielding performance and thermal stress distribution to prevent substrate cracking.
2Object-affected harmful factors
If a single thick light-shielding film is used to block light from reaching the transistor, then light-shielding effectiveness is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The light-shielding function is segmented across multiple scanning line layers positioned at different depths in the device structure. Each layer contributes to the overall light-blocking effect, distributing the shielding function throughout the structure rather than relying on a single complex thick film.
Solution Approach 2:
The multi-layer scanning line structure serves multiple functions simultaneously: it provides light shielding, manages thermal stress, and maintains electrical connectivity. This multi-functionality reduces the need for separate dedicated light-shielding components, simplifying the overall device architecture.
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
This configuration effectively improves light-shielding properties for transistors, reducing the likelihood of display defects such as luminance unevenness and maintaining the integrity of the substrate, thus enhancing the overall display quality.
Implementation Method 1
an interfacial reflection at the first insulating film side of the light-shielding film is greater than an interfacial reflection at the dielectric layer side of the first electrode with respect to light entering from the first substrate
Implementation Method 2
the first insulating film has a thickness thicker than that of the first electrode, the dielectric layer, the second electrode, or the light-shielding film, and the first insulating film has a refractive index smaller than that of the second electrode
Data Source
AI summary
An electro-optical device includes a substrate having light-transmissivity, a capacitance element having light-transmissivity and including a first electrode, a dielectric layer, and a second electrode, a first insulating film having light-transmissivity, a light-shielding film, a second insulating film having light-transmissivity, and a transistor. The first electrode, the dielectric layer, the second electrode, the first insulating film, the light-shielding film, the second insulating film, and the transistor are layered in this order from the substrate side, and an interfacial reflection at the first insulating film side of the light-shielding film is greater than an interfacial reflection at the dielectric layer side of the first electrode with respect to light entering from the substrate.