Liquid Crystal Pixel Layout for Stable Capacitance and Transmittance
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Solution Overview
Problem
The existing electro-optical device configurations, such as those described in JP-A-2020-38248, suffer from increased resistance values in the first conductive layer due to thickness and film quality, leading to potential variations in capacitance electrode potentials and risks of display defects like unevenness, as well as compromised transmittance due to increased thickness.
Innovation Solution
The electro-optical device incorporates a substrate with a pixel electrode, capacitance wiring, a transistor, a light shielding member, and a capacitance element with protrusion portions, along with a conductive member electrically coupled through contact holes, to stabilize capacitance and maintain transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the first conductive layer is increased to reduce resistance, then the resistance value decreases, but the thickness of the light transmitting region increases, resulting in compromised transmittance
Solution Approach 1:
The first conductive layer is divided into a light shielding portion (within the light shielding region) and a light transmitting portion (within the light transmitting region). This segmentation allows the light transmitting portion to maintain low thickness for high transmittance while the light shielding portion can be thicker for lower resistance, resolving the contradiction between resistance reduction and transmittance maintenance.
2Reliability
If the thickness of the first conductive layer is increased to reduce resistance, then the resistance value decreases, but potential variation due to film quality and wiring dimensions increases, leading to display defects
Solution Approach 1:
Different thickness requirements are applied to different regions: the light shielding region allows thicker conductive layers for lower resistance, while the light transmitting region maintains thinner layers for consistent potential distribution and high transmittance. This local quality differentiation resolves the contradiction between resistance reduction and potential uniformity.
Data Source
AI summary
A liquid crystal apparatus includes a substrate, a pixel electrode, common wiring provided between the substrate and the pixel electrode, a TFT, a scanning line, a capacitance element provided between the substrate and the scanning line and overlapping the scanning line in plan view, and a second relay electrode electrically coupled to the common wiring and overlapping the scanning line in plan view. A first capacitance electrode serving as one electrode of the capacitance element includes a projecting portion protruding from the scanning line in plan view. The second relay electrode includes a projecting portion overlapping the projecting portion in plan view. The second relay electrode and the first capacitance electrode of the capacitance element are electrically coupled to each other through a contact hole provided between the projecting portion and the projecting portion.