Integrated Capacitor Display Panel for Thin High-Resolution HMDs
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Solution Overview
Problem
Existing display devices, particularly head-mounted displays, face challenges in achieving high-resolution images while maintaining a reduced thickness, which is crucial for comfort and functionality.
Innovation Solution
The display device incorporates a novel capacitor structure with a first and second capacitor connected to a transistor, featuring a well region and a gate electrode, along with a thinner gate insulating layer, to enhance capacitance and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional capacitor structure is used, then the display panel thickness is reduced, but the capacitance is insufficient for high-resolution images
Solution Approach 1:
The capacitor is integrated within the transistor structure by forming the capacitor's electrode within the same well region as the transistor. The gate electrode of the capacitor shares the same spatial domain as the transistor channel, creating a nested configuration that increases capacitance without adding external thickness to the display panel.
Solution Approach 2:
The invention transitions from a planar capacitor structure to a three-dimensional configuration by utilizing the vertical depth of the well region. The capacitor electrode extends into the substrate depth, effectively using the third dimension (z-axis) to increase capacitance value without increasing the horizontal footprint or overall panel thickness.
2Length of stationary object
If the gate insulating layer is made thinner, then the display panel thickness is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The invention changes the gate insulating layer thickness parameter to a thinner dimension (e.g., reducing from conventional 50-100nm to 20-40nm range) to reduce overall display panel thickness. This parameter change directly contributes to the thinning goal while the manufacturing process is adjusted accordingly to handle the thinner layer requirements.
Data Source
AI summary
A display device includes: a first transistor; a light emitting element connected to the first transistor; and a first capacitor connected to a gate electrode of the first transistor, wherein the first capacitor includes: a first well region of a substrate; a source electrode and a drain electrode in the first well region; and a gate electrode in a channel region of the first well region, wherein the gate electrode of the first capacitor is connected to the gate electrode of the first transistor.